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Lake Oswego Stormwater Management Manual Appendices - March 2016 APPENDIX A SUBMITTALS Site Assessment and Feasibility Analysis Checklist - A-1 Drainage Report - A-2 Impervious Surface Area Reduction Table - A-3 Integrated Pest Management Plan Example - A-4 Sample Operations and Maintenance Plan - A-5 A APPENDIXA- 1 SUBMITTALS Site Assessment and Feasibility Analysis Checklist A-1.0 Site Assessment and Feasibility Analysis-Site Map Item Source of Information Confirm whether item is included on site map, in drainage report text,or N/A Property Lines LOMap Lot Dimensions LOMap Contours LOMap Onsite and offsite drainage patterns Site visit Project location (township and range) LOMap Watershed (Willamette River,Tualatin LOMap River, Oswego Lake) Existing improvements with dimensions LOMap;site visit and distance from property lines Existing stormwater collection, LOMap;site visit conveyance,treatment,and flow control facilities Areas of protected native soils and/or Site visit amended soils that have been added for stormwater management function Sensitive lands delineation LOMap Wetland delineation LOMap Floodplain delineation LOMap Site Assessment and Feasibility Analysis—Other Information Depth to groundwater City/US Geological Survey(USGS) USGS depth to groundwater information is available at: http://or.water.usgs.gov/profs dir/ puz/ Suitability for infiltration- Hydrologic soils http://websoilsurvev.nres.usda.gov/ group(A, B,C,or D) app/HomePaee.htm Contours Document areas that will be protected Include soils,trees to be protected, during construction and development sensitive areas,water bodies Document areas of proposed stormwater management facilities Document limits of land disturbance and locations of proposed new/replaced impervious surface Site Assessment and Feasibility Analysis—Information to Confirm with City Landslide hazard area Consult with Planning Department Existing drywell Check with Engineering Department to confirm whether drywell is registered as UIC; request record drawings(as-builts). May need to decommission if not registered as UIC. Jurisdictional wetland;confirmation of Consult with Planning Department. A-1.1 sensitive lands Knowledge of decommissioned oil tank or past hazardous material storage. Confirm through soil testing(see Section 4.4). Existing trees Review Lake Oswego Tree Removal, Protection, and Care Guide. Protect existing trees by incorporating them into design,or consult with City for a Tree Removal permit. A-1.2 APPENDIX A-2 SUBMITTALS Drainage Report A-2.0 City of Lake Oswego Drainage Report Project Name Project Number A-2.1 Project Overview Please provide the following information along with a brief description for the proposed project. Project Owner and Location Property Owner/Land Owner Phone Address Project Owner/Developer Phone Address Project Engineer (If applicable) Name of Supervising Engineer Company Phone Name of Licensed Landscape Architect or Landscape Designer Company Phone Project Name Project Type' Development Name Site Address Tax Lot# Legal description of the lot (if new construction): 1 Examples of project types include 2-lot partition, new commercial, multi-family, and single-family residential. A-2.2 Page of Other Permits and Reviews (Answer All That Apply) Building Permit#: LU #: Has a land use planning review been conducted? (Circle One) Yes No Is a tree removal permit needed? (Circle One) Yes No Tree removal permit#: Is there a sensitive lands overlay? (Circle One) Yes No What is the zoning overlay? Are there special street setbacks? (Circle One) Yes No Setback distances: City of Lake Oswego Erosion Control Permit#: 1200-C Permit#: Is the project classified as a Small, Medium, or Large Project according to Lake Oswego Stormwater Code? (Circle One) Small Project Medium Project Large Project New or redevelopment projects that New or redevelopment projects that New or redevelopment projects that create or replace>200 sq ft and create or replace>_1000 sq ft and create or replace>_3000 sq ft <1000 sq ft of impervious surface <3000 sq ft of impervious surface Site Map Criteria Attach a site map that includes any of the listed applicable attributes for each drainage facility. Provide additional descriptions for each item if appropriate. • Property lines • Contour lines and critical elevations (City Datum) • Lot dimensions • Onsite and offsite drainage patterns (indicate with arrows) and features • Project location (Township and Range) • Stormwater Management Subbasin (Available on Web) • Total Impervious Area (TIA) of project • Effective Impervious Area (EIA) of project site • Existing and proposed improvements with dimensions and distance from property lines • Proposed stormwater collection, conveyance, treatment and flow control features • Areas of protected native soils and/or amended soils that have been added for stormwater management function • Sensitive lands delineation • Floodplain delineation • Wetland delineation A-2.3 Page of Minimum Project Requirements Project Type? (Circle One) New development Redevelopment Project classification? Refer to previous page for description of Small, Medium, or Large project classification descriptions. (Circle One) Small Project Medium Project Large Project See Stormwater Design Manual to determine which of the following minimum requirements apply. Check All Minimum Project Requirements that apply: Minimum Project Requirement Site Assessment and Feasibility Analysis Onsite Stormwater Management City of Lake Oswego Erosion Control Permit UIC Review with DEQ System Designed by Licensed Professional Downstream Analysis Drainage Report Required Recorded Operations and Maintenance Plan Recorded Maintenance Covenant Design for Infiltration Design for Water Quality Design for Flow Control NPDES 1200 C Permit form DEQ A-2.4 Page of Minimum Requirements Summary In the following section, describe how each applicable minimum requirement will be met. Site Assessment and Feasibility Analysis The goal of the site assessment and feasibility analysis is to incorporate stormwater management into the landscape in a way that will preserve onsite drainage, soils, and native vegetation. Another important goal of the site assessment is to identify good locations for stormwater facilities and BMPs BEFORE design actually begins on a project. Applicants must conduct the feasibility assessment prior to consulting with building or planning departments. In order to simplify this process, the city has developed an interactive map website called LOMap. LOMap is an online tool that provides GIS data for many of the site attributes needed for a proper site analysis. GIS layers within the mapping tool include: • Tax lot data • Neighborhood associations • Zoning information • Environment layers (FEMA boundaries, soil information, and fault lines) • Utility locations • Planning information (Design districts, Heritage trees, historic landmarks, permits, special street setbacks, commercial overlays, and sensitive lands) • Fire information • As-Builts • Parks Maps can be created with necessary data layers and printed or saved for future reference and sharing. The mapping tool is found online at: http://gis.ci.oswego.or.us/GeoNorth/Flexmap3/Flexmap.html For instructions on how to use the City of Lake Oswego's Flex Map, go to: http://gis.ci.oswego.or.us/GeoNorth/Flexmap3/assets/docs/help.pdf In addition to the information found on LOMaps, consideration of the following site attributes should be documented and considered within the site assessment: • Existing vegetation (native vegetation, invasive species and weeds, existing trees, and dominant vegetation cover types) • Surrounding land use • Existing drainage patterns and features Attach site assessment and feasibility analysis. A-2.5 Page of Onsite Storm water Management Onsite stormwater management facilities must be sized to infiltrate 100 percent of the stormwater runoff for a 10-year, 24-hour design storm based on tested infiltration rates (Inches/Hour). Which approved BMPs will be used to meet the onsite stormwater management requirement? Onsite Storm water Management BMPs Rain garden Infiltration trench Planter Drywell Refer to BMP design guideline(s) for selected BMP(s). Attach the following: • Infiltration test results • UIC registration information (where applicable) • Geotechnical report (where applicable) • Soil testing results (where applicable) • Calculations demonstrating sizing in conformance with BMP design guidelines • Description of approved discharge location City of Lake Oswego Erosion Control Permit/NPDES 1200-C Permit from DEQ Describe how the project will meet erosion and sediment control requirements. Attach the following: • Erosion Control Plan • 1200-C permit (if applicable) A-2.6 Page of Underground Injection Control (UIC) Review with Oregon Department of Environmental Quality Stormwater controls that qualify as UIC systems include, but are not limited to: • Drywells and drill holes • Trenches with depth from ground surface that is greater than width regardless of the presence of gravel fill or soil cap • Infiltration trenches trenches Does the project include a BMP that is an underground injection control (UIC) that must be registered with the Oregon Department of Environmental Quality (DEQ)? (Circle one) Yes No If the answer to the above question is yes, the project needs to conform with all applicable regulations. Attach the following: • Documentation of UIC registration with DEQ Downstream Analysis Attach the following: • Calculations for downstream analysis Recorded Operations and Maintenance Plan Attach the following: • Approved Operations and Maintenance (0 & M) Plan • Deed restrictions A-2.7 Page of Design for Water Quality Which approved BMPs will be used to treat water quality? Water Quality BMPs Swale Planter Rain garden Constructed wetland Wet pond Sand filter Filter strip Refer to BMP design guideline(s)for selected BMP(s). Attach the following: • Infiltration test results • UIC registration information (if applicable) • Geotechnical report (if applicable) • Soil testing results (if applicable) • Calculations demonstrating sizing in conformance with BMP design guidelines A-2.8 Page of Design for Flow Control Refer to the Lake Oswego BMP design guidelines within the Lake Oswego Storm water Design Manual for selection of appropriate BMP(s). Which approved BMPs will be used for flow control? Flow Control BMPs Infiltration trench Drywell or Infiltration chamber (UIC) Infiltration pond Constructed wetland with detention storage Rainwater harvesting Detention pond Detention pipes and vaults Attach the following: • Infiltration test results • UIC registration information (if applicable) • Geotechnical report (if applicable) • Soil testing results (if applicable) • Calculations demonstrating sizing in conformance with BMP design guidelines A-2.9 Page of Phosphorous Removal Efficiency for New Development Projects For new development projects, include phosphorous removal effiency calculations. Calculate the phosphorus removal efficiency as follows (OAR 340-41-0340): 100 - 24.5 Rp = R Where: Rp Required phosphorous removal efficiency Rv Average site runoff coefficient The average site runoff coefficient can be calculated from the following equation: Rv= (0.7xA1) + (0.3xA2) + (0.7xA3) + (0.5xA4) + (A5x0.0) Where: Al Fraction of total area that is paved streets with curbs and that drain to storm sewers or open ditches. A2 Fraction of total area that is paved streets that drain to water quality swales located on site. A3 Fraction of total area that is building roof and paved parking that drains to storm sewers. A4 Fraction of total area that is grass, trees and marsh areas. A5 Fraction of total area for which runoff will be collected and retained on site with no direct discharge to surface waters. A-2.10 Page of APPENDIX A-3 SUBMITTALS Impervious Surface Area Reduction Table A-3.0 Impervious Surface Area Reduction Table Step 1. Initial estimate of impervious surface area'. Description Quantity Total new impervious surface area (sq.ft.) Total replaced impervious surface area (sq.ft.) Total new plus replaced impervious surface area (sq.ft.) Initial Estimate Step 2. Apply impervious surface area reduction credits. Description Quantity Total area of green roof(sq. ft.) Total area of porous pavement (sq. ft.) Other credits or reductions in impervious surface area (new/ protected trees, non-effective impervious surface2—consult with planning and/or engineering department for details) (sq. ft.) Total impervious surface area reduction credits (sq. ft.) Reduction Step 3. Calculate remaining impervious surface area to be managed. Description Quantity Initial estimate (sq. ft.) Reduction (sq. ft.) Impervious surface area to be managed (sq. ft.) (Subtract reduction from initial estimate) sq.ft. =square feet 1 Impervious surface area:Any surface resulting for development activities that prevents the infiltration of water or results in more runoff than in the undeveloped Effective impervious surfaces are condition. Common impervious surfaces include: building roofs,traditional those impervious surfaces that concrete or asphalt paving on walkways, driveways, parking lots, gravel roads, contribute runoff to the surface and packed earthen materials. water management system. Runoff from these surfaces either enters 2 Effective impervious surface area: Impervious surfaces that are connected via catch basins and pipes directly or sheet flow or discrete conveyance to a drainage system.A sidewalk that drains indirectly. to a lawn or other landscaped area where stormwater runoff from the impervious surface can infiltrate is not considered effective impervious surface. After calculating the area of impervious surface to be managed, refer to Table 3.2 to determine the project classification and applicable minimum requirements. A-3.1 APPENDIX A-4 SUBMITTALS Integrated Pest Management Plan Example A-4.0 Integrated Pest Management Plan Example Source: Seattle Public Utilities. 2009a. Director's Rules for Seattle Municipal Code Chapters 22.800 — 22.808. Volume 1: Source Control Technical Requirements Manual. Used with permission. An Integrated Pest Management Plan (IPM) is a natural, long-term, ecologically based systems approach to controlling pest populations. This system uses techniques either to reduce pest populations or maintain them at levels below those causing economic injury, or to so manipulate the populations that they are pre- vented from causing injury. The goals of IPM are to encourage optimal selective pesticide use (away from prophylactic, broad spec- trum use) and to maximize natural controls to minimize the environmental side effects by creating and maintaining healthy landscapes: • Design for a healthy landscape. A landscape should be designed to maximize intended uses of the land and to minimize potential pest problems. Design considers such plant health factors as site us-age, soils, topography, hydrology and drainage, proximity to sensitive or critical areas, and existing vegetation as well as known pest sensitivity. • Awareness of potential pest problems. Certain plants have known pest problems. Likewise, certain cultural conditions or landscape situations can encourage the infestation of pests. • Maintenance for maximum landscape health. A well-designed and maintained landscape dramati- cally reduces the need for pest control. Appropriate selection of plants, pruning, proper irrigation, applications of mulch and fertilizer, appropriate mowing techniques, and other practices all promote landscapes that resist pest pressures and support natural predators. • Minimize disturbance of naturally occurring biological controls. Pests have natural predator and con-trol operating on them at all times. Disruption of these systems through poor maintenance practices can cause more new pest problems to develop. The step-by-step comprehensive IPM process is provided below as a guide. The Integrated Pest Management Plan Process Step One: Correctly identify problem pests and understand their life cycle. Learn more about the pest. Observe it and pay attention to any damage that may be occurring. Learn about the life cycle. Many pests are only a problem during certain seasons or can only be treated effectively in certain phases of the life cycle. Step Two: Establish tolerance thresholds for pests. Every landscape has a population of some pest insects, weeds, and diseases. This is good because it supports a population of beneficial species that keeps pest numbers in check. Beneficial organisms may compete with, eat, or parasitize disease or pest organisms. Decide on the level of infestation that must be exceeded before treatment needs to be considered. Pest populations under this threshold should be moni- tored but do not need treatment. For instance, European crane flies usually do not do serious damage to a lawn unless there are between 25 and 40 larvae per square foot feeding on the turf in February (in normal weather years). Also, most people consider a lawn healthy and well-maintained even with up to 20 percent weed cover, so treatment, other than continuing good maintenance practices, is generally unnecessary. A-4.1 Step Three: Monitor to detect and prevent pest problems. Regular monitoring is a key practice to anticipate and prevent major pest outbreaks. It begins with a visual evaluation of the lawn or landscape's condition. Take a few minutes before mowing to walk around and look for problems. Keep a notebook, record when and where a problem occurs, then monitor the problem at about the same time in future years. Specific monitoring techniques can be used in the appropriate season for some potential problem pests, such as European crane fly. Step Four: Modify the maintenance program to promote healthy plants and discourage pests. A healthy landscape is resistant to most pest problems. Lawn aeration and overseeding along with proper mowing height, fertilization, and irrigation will help the grass out-compete weeds. Correcting drainage problems and letting soil dry out between watering in the summer may reduce the number of crane fly larvae that survive. Step Five: If pests exceed the tolerance thresholds. Use cultural, physical, mechanical, or biological controls first. If those prove insufficient, use the chemical controls described below that have the least non- target impact. When a pest outbreak strikes (or monitor- ing shows one is imminent), implement IPM and then consider control options that are the least toxic or have the least non-target impact. Here are two examples of an IPM approach: • Red thread disease is most likely under low nitrogen fertility conditions and most severe during slow growth conditions. Mow and bag grass clippings to remove diseased blades. Fertilize lightly to help the grass recover, then begin grass-cycling and change to fall fertilization with a slow-release or natural-organic fertilizer to provide an even supply of nutrients. Chemical fungicides are not recom- mended because red thread disease cannot kill the lawn. • Crane fly damage is most prevalent on lawns that stay wet in the winter and are irrigated in the sum- mer. Correct the winter drainage and/or allow the soil to dry between irrigation cycles;larvae are susceptible to drying out so these changes can reduce their numbers. It may also be possible to reduce crane fly larvae numbers by using a power de-thatcher on a cool, cloudy day when feeding is occur- ring close to the surface. Studies are being conducted using beneficial nematodes that parasitize the crane fly larvae; this type of treatment may eventually be a reasonable alternative. UOnly after trying suitable non-chemical control methods or determining that the pest outbreak is causing too much damage should chemical controls be considered. Study to determine what products are available and choose a product that is the least toxic and has the least non-target impact. Step Six: Evaluate and record the effectiveness of the control, and modify maintenance practices to support lawn or landscape recovery and prevent recurrence. Keep records. Note when, where, and what symptoms occurred, or when monitoring revealed a potential pest problem. Note what controls were applied and when, and the effectiveness of the control. Monitor each year for the same problems. Review landscape maintenance and cultural practices to see if they can be modified to prevent or reduce the problem. A comprehensive IPM program should also include the proper use of pesticides as a last resort, and veg- etation/fertilizer management to eliminate or minimize the contamination of stormwater. A-4.2 APPENDIX A-5 SUBMITTALS Sample Operations and Maintenance Plan A-5.0 SAMPLE OPERATIONS AND MAINTENANCE PLAN Facility Name/ID #: Facility Type: Name(s) of Person Responsible for Maintenance: Facility Address: Site Map Provide the following: • Facility location and orientation • Maintenance access location • Flow direction • Designated inspection locations • North arrow • Scale Mark any photo monitoring points on site map or on the as-built/record drawing. Also attach design or record (as-built) drawings of facility that show the following (as applicable): ❑ Maintenance access ❑ Infiltration soils to be protected from compaction by heavy equipment ❑ Overflow location and configuration ❑ Inlet and outlet pipes, including size, material, and elevation ❑ Orifice size and elevation ❑ Other: A-5.1 Maintenance and Inspection Triggers Describe maintenance access for inspection by City staff (also indicate on site sketch or map): Summarize Maintenance and Inspection Schedule Frequency or Trigger Inspection or Maintenance to be Performed Provide Maintenance and Inspection Form specific to your facility. An example for a rain garden is attached. A-5.2 Sample Inspection Form Facility Name/ID #: Date of Inspection: Name(s) of Inspectors: Facility Address: Time since last rainfall (hours): Quantity of last rainfall (inches): Site Sketch (include inlets, outlets, north arrow, flow direction, etc.) Mark any photo monitoring points on site sketch or on the as-built/record drawing. Based on a visual assessment of the site, answer the following questions: Function: Soil Depth, Infiltration Capability, and Health Facility Footprint 1. Are there indications of any of the following in the vegetated facility? (If yes, mark on site sketch or as-built/record drawing) ❑ Erosion ❑ Settlement ❑ Compaction ❑ Seeps and wet spots ❑ Holes through berms ❑ Other: ❑ None A-5.3 Mulch 2. Are there any bare spots (without mulch cover) or locations with mulch depth less than 2 inches? ❑ Yes ❑ No If yes, mark on site sketch. Function: Water Movement Through the Facility Inlets/Outlets/Pipes 3. How many inlet structures are present? ❑ 0 ❑ 1 ❑ 2 ❑ 3 ❑ 4 ❑ 5 ❑ > 5 Are any of the inlet structures clogged? (If yes, mark the location on your site sketch and fill in the boxes below with the cause of the clogging (e.g., debris, sediment, vegetation, etc.) ❑ No ❑ Partially ❑ Completely ❑ Not Applicable 4. Are any of the inlet structures altered from the original design or otherwise in need of maintenance? (If yes, write in reason: frost heave, vandalism, unknown, etc.) Inlet #: Inlet #: Inlet #: Inlet #: Inlet #: Partially clogged Completely clogged Reason for maintenance 5. Are any trashracks, overflow or underdrains clogged? ❑ No ❑ Partially ❑ Completely ❑ Not Applicable a. If yes, mark the location on your site sketch and fill in the boxes below with the cause of the clogging (e.g., debris, sediment, vegetation, etc.) b. Are any of the overflow or bypass structures altered from the original design or otherwise in need of maintenance? (If yes, write in reason: frost heave, vandalism, unknown, etc.) Outlet #: Outlet #: Outlet #: Partially clogged Completely clogged Reason for maintenance i Pondine Area 6. Is there ponded water in the facility? ❑ Yes ❑ No If yes, how deep? If yes, describe the potential reasons for ponded water below (recent rainfall, non-functional underdrain, groundwater input, illicit pipe connection, inadequate capacity in facility [due to debris, sediment, or vegetation clogging, etc.]) Notes: A-5.4 Function: Vegetation Cover and Health Vegetation 7. What is the approximate vegetation survival rate? a. Is there the presence of? ❑ Diseased plants ❑ Weeds Species: ❑ Noxious weeds Species: ❑ Water stress? Other: b. Does the vegetation appear to be healthy? ❑ Yes ❑ No (If no, describe below) c. Is the vegetation the appropriate size and density? ❑ Yes ❑ No (If no, describe below) Notes: Watering 8. Does the irrigation system appear to be functioning as designed? ❑ Yes ❑ No ❑ Not applicable; no irrigation system present ❑ Can't tell 9. Is there any evidence of leaks, broken sprinkler heads, or damage to the irrigation system? ❑ Yes ❑ No ❑ Not applicable; no irrigation system present ❑ Can't tell If yes, mark on site sketch where repairs are needed. Other Pest Control 10. Is there any evidence of animal burrowing, animals causing damage to plants, animal feces, or other pest damage? ❑ Yes ❑ No If yes, please describe: A-5.5 Summary Inspector's maintenance recommendations and record of maintenance performed (check the appropriate boxed in the table below) Maintenance Needed 4J N (p c�C c O O C C N O L Z 1 Facility E Maintenance Performed Component — During Visit Notes Facility Footprint Mulch Inlets Outlets Pipes Vegetation Irrigation/ Watering Pest Control Other: Other: A-5.6 Additional Notes: Did you identify any major issues with the facility? If yes, contact the City's Stormwater Quality Coordinator. Estimated Time Spent at Facility: IN: OUT: TOTAL: LEAD INSPECTOR'S INITIALS: A-5.7 WWV / CONNECT PVC PIPE TO 6"___ TRENCH DRAIN,FIELD FIT , I _______________________ _____ ___________________ EXISTING I - ___ CLEANOUT _7— BUILDING - - V /7//7/4" - ' 3"DIA PVC PIPE(TYP) Is FOOTPRINT ...‘4 .‘/, '' EXISTING TYPE 1 INLET -I.:._- . / - O c4_ _ 16 LF 4"DIA.PP UDP - Z---- -+ c'• 'Y/ //- / t•. • . •• •.. . .. . ., . . 1: _Z 1;ERMEABLE PAVER _/- _ _ r--..------- ---_____ / Z - - MAINTENANCE PLAN-INSPECTION POINTS 2 _ _ PVC DOWNSPOIJTADAPTER — — — — — — Q, '. DESCRIPTION OBSERVATION TRIGGER ACTION — CRACK OR OTHER "----1IiHiHi 11111114 I 1 I 1111 VII 1 1 1 1 1 _ 02 TRENCH DRAIN OUTLET CHECK STRUCTURAL CONDITION,CLEAR DEBRIS DEFICIENCY REPAIR OR REPLACE - - --PERMEABLE c._ - - PAVERS - - - - , _ III lip_ R„,... 1 11-n.ii cll . . 0 OVERFLOW CHECK THAT WATER CAN OBSERVED DAMAGE; REPAIR OR REPLACE ,"THICK STREAMBED DRAIN FREELY WATER NOT DRAINING 6. 11, _.•OBBLES AT TRENCH- 1 p Ai CHANNELS OR CUTS 2 FILL AND REPAIR(SEE , DRAIN OUTLET A • 0 P 7;1 II 111111111r ® BIORETENTION SOIL SURFACE CONDITION INCHES WIDE CHECKLIST) - - - • - - All - - - - - :..a.‘.:.G %. BARK MULCH:: I 0 VEGETATION CONDITION,DENSITY LESS THAN 90%COVER WITH VEGETATION SEE CHECKLIST U -- IITP a 7 7 7 7 -Hrlit; .4 "."..i...••, "" "-, :ao,',,,,,,1,,-711,04.1", • , -1",* — "Zee• • • •• • ''' •• ' 141- , I / , 4 -,-... .40 z/ Z 41 / (...) MULCH DEPTH,CONDITION INADEQUATE COVERAGE REPLA.gHtior SEE Trlir, - - - INA —— Ball , 41 — e.:* / 1-: — —‹ — / el I-- ...re / 40 / ze - - - ,.:,, OVERFLOW-12"DIA NYLOPLAST ''',. - - 1071 • ' A /, ar, / Ar 92812AG DRAIN BASIN AND - - - %k% . — DOME GRATE •a7. / _ — c),,R0E;TE-rg,N)son_ ---— — -RAIN GAP13EN .4.,440/11 144;WOW,;.-i. l'.._a-117-' DOWNSPOUT PIPE /- ®BOTTOM _ _n_ri 103 / EXISTING DOWNSPOUT l'' t ///- -Q) TRENCH DR/UN 3"Li, p? LI d n g en DESIGN PONDING DEPTH 102 .— o g d d 103 2 d BARK MULCH(3.DEPTH)® d: :7 102 UNDERDRAIN PIPE 'cl 4"STREAMBED ,,i . EXISTING GRADE COBBLES WI ir4 ,o,,o, —7----- - ---*;. ,'—• —/--- — DESIGN PONDED K'%Ai', "" v,.••..:'W killniftWiTIA, ,,,,,-0,..,,,,6•1; A,A o , 114114WWW1114.11''.*40 "'Of'W'vk#'*e' , 5 PLAN-RAIN GARDEN 1 i 03 99 i STREAMBEDDEPTH) \4/\' 'SiS'‘44 eelISt.eV,,./, .',CA4.' 1 '' •, 99 .1 SCALE 1,3' n ej (8. /).'- / tOZ.Z.0:11.;6"Zielizez1 3(MIN) • 3 ' lj COBBLES 98 _1 , 97 97 MINERAL AGGREGATE TYPE 26(16"DEPTH) NOTES: •c.., i _. UNDERDRAIN PIPE ___ ,,,A1 98 o 96 9 1 SEE MAINTENANCE CHECKLISTS(APPENDIX H)FOR INSPECTION ; (TYP) g -92Mi REQUIREMENTS AND CORRECTIVE ACTIONS 95 2 g'a'. 95 PROFILE-RAIN GARDEN C HORIZONTAL SCALE IN FEET g L! i 1 HORIZ SCALE 0 ,1,3' t VERT.SCALE 1,1 5' 8 1.5 0 IS 3 VERTICAL SCALE IN FEET i VERTICAL EXAGGERATION 2 I r--- — LAKE OSWEGO STORMWATER 1 il OE E MARCH 2014 6 1 DESIGNER DRESS ..S. I I MANAGEMENT MANUAL r-7.04931000 alEcKED I EXAMPLE O&M PLAN-RAIN GARDEN C-6 'A ,,. REVISION ' AP'''' ONE 1 HERRERA 17S NOTES spassvER RAIN GARDEN B PLAN AND PROFILE rET" 8 2 12 A-5.8 / -/ vvTvvvvvvvv 1 6 PUG \\\\\�:'.`l\\\\ I\ 0 // 1'''l\ \\\\\\\\ I EXISTING \ \\\\\\\\\ C TYPE 1 INLET ',�,x�X\X\X\T\ I LU s MAINTENANCE PLAN-INSPECTION POINTS 0 / ,..„,,, \\\\4\\\\\ Po, O ./� , POINT DESCRIPTION OBSERVATION TRIGGER ACTION 1 SEDIMENT DEPTH ON TOP CONDUCT VISUAL SEDIMENT DEPTH CARTRIDGE REPLACEMENT == 4 • (1CCA O OF CARTRIDGES INSPECTION EXCEEDS}" AND SE,IQUIREDMOVAL --------- ------L-_-'-- p_uy CONDUCT VISUAL SEDIMENT REMOVAL AND ^_ -L----�- -- 1 L SEDIMENT DEPTH ON INSPECTION(NO ENTRY SEDIMENT DEPTH CARTRIDGE REPIACEMEM \ / �_• O2 STRUCTURE FLOOR EXCEED54" MEDIA FILTER MANHOLE REQUIRED) REQUIRED SEE DETAILA CONDUCT VISUAL GREATER THAN 4"OF OSTANDING WATER IN OBSERVATION(NO ENTRY STANDING WATER IN INSPECT OUTLET STRUCTURE REQUIRED) STRUCTURE AFTER 24 STRUCTURE _____-- m I HOURS AFTER A STORM ----------_ ;m L ITyLID 1 r - ® REPLACE CARTRIDGES MEDIA FILTER DESIGN REPLACEMENT ACCORDING TO DESIGN CARTRIDGES INTERVAL IS#YEARS 4110 I MAINTENANCE INTERVAL — 00) V 1 RIM EL.813.00 PLAN-MEDIA FILTER THIS PLAN IS AN EXAMPLE ONLY-~l' O OWNER/OPERATOR OF FACILITY SCALE 1^=a' ca MEDIA O SHALL DEVELOP MAINTENANCE AND FILTER CARTRIDGE INSPECTION PLAN FOR INDIVIDUAL -°' I —©© CARTRIDGE SEALED OUTLET FACIILTY. RISER 3 HDPE OUTLET INLET PIPE • P 80 E1_609 62 ° ; NOTES: 1. CARTRIDGE REPLACEMENT INTERVAL DEPENDS ON FLOWS AND _ EL 6065/ SEDIMENT LOADS AND SHALL BE DETERMINED ON A o y PROJECT-SPECIFIC BASIS 2. TRAFFIC CONTROL AND CONFINED SPACE ENTRY SHALL BE IN z �_£ ACCORDANCE WITH ALL APPLICABLE REGULATIONS AND AS g `m ELEVATION-MEDIA FILTER OA NEEDED TO PROTECT MAINTENANCE PERSONNEL DEPENDING ON ACTIVITIES PERFORMED - - HORIZ SCALE:N.TS w a £ VERT.SCALE:N.T S y c66 I1 mp� o LAKE OSWEGO STORMWATERIwfE MARCH2O14 s§ I «� MANAGEMENT MANUAL 1°"°"`faO4DU0006 �e`°� EXAMPLE O&M PLAN ° 8 A-2 a "° PEV1$10N APpD XX HERRERA IS ND,E. ° PROPRIETARY FACILITY �' °° 2 2 A-5.9 APPENDIX B INFILTRATION TESTING GUIDANCE Infiltration Testing Report - B-1 City of Seattle Modified Procedure for Conducting Pilot Infiltration Test - B-2 B APPENDIX B- 1 INFILTRATION TESTING GUIDANCE Infiltration Testing Report Courtesy of Portland Environmental Services Used with permission B-1.0 Infiltration Testing Report Note—adapted from Portland Stormwater Management Manual (Portland 2008). Include the following information in the Infiltration Testing Report. The Infiltration Testing Report should be attached to the project's Design Report: 1. Statement of project understanding (proposed stormwater system) 2. Summary of subsurface conditions encountered 3. Summary of infiltration testing including location and number of tests and testing method used. Dis- cussion of how the tests were performed (i.e. pipe type or diameter or test pit dimensions) 4. Infiltration testing results in inches per hour 5. Recommended design infiltration rate 6. Groundwater observations within exploration and an estimate of the depth to seasonal high ground- water 7. Site plan showing location of infiltration tests 8. Boring or test pit logs. The logs should include an associated soil classification consistent with ASTM D2488-00, Standard Practice for Classification for Description and Identification of Soils (Visual- Manual Procedure). The logs should also include any additional pertinent subsurface information, such as soil moisture conditions, depth and description of undocumented or engineered fill, soil color and mottling conditions, soil stiffness or density, and approximate depth of contact between soil types. 9. Infiltration Test Data Tables (see following pages for example and blank tables) B-1.1 Lot number and Location Dimension of hole: Test Hold Location and Number Test method Proposed BMP Date Depth to bottom of hole: Tester's name, company, and phone number Depth (feet) Soil Texture Notes Pre-saturation start time Pre-saturation end time Time Time interval (minutes) Drop in water level Notes (feet) B-1.2 APPENDIX B-2 INFILTRATION TESTING GUIDANCE City of Seattle Modified Procedure for Conducting Pilot Infiltration Test Used with permission See Seattle Public Utilities (2009b) B-2.0 Appendix E - City of Seattle Modified Procedure for Conducting a Pilot Infiltration Test The Pilot Infiltration Test (PIT) consists of a relatively large-scale infiltration test to better measure infiltration rates for design of stormwater infiltration facilities. The PIT reduces some of the scale errors associated with relatively small-scale double ring infiltrometer or"stove-pipe" infiltration tests. It is not a standard test but rather a practical field procedure based on the methods recommended by Ecology's Technical Advisory Committee. Correction factors must be applied to the infiltration rate measured using PIT to establish a design infiltration rate for BMP sizing. For infiltration basins, there shall be one test pit per 5,000 square feet of basin infiltrating surface with a minimum of two per basin, regardless of basin size. For bioretention facilities and permeable pavement facilities, there shall be one test pit per 5,000 square feet of contributing area. For infiltration trenches, there shall be one test pit per 50 feet of trench length. For drywells, there shall be at least one test pit per well. Prepare detailed logs for each test pit and a map showing the location of the test pits. Logs must include the depth, depth to water, evidence of seasonal high groundwater elevation, existing ground surface elevation, proposed facility bottom elevation, and presence of stratification that may impact the infiltration design. PIT test reports shall be stamped by a Professional Engineer or prepared by an on-site wastewater treatment designer licensed with the State of Washington. E.1 Infiltration Test • Excavate the test pit to the depth of the bottom of the proposed infiltration facility. Lay back the slopes sufficiently to avoid caving and erosion during the test. • The size of the bottom of the test pit should be as close to the size of the planned infiltration facility as possible, but not less than 2 feet by 2 feet. Where water availability is a problem, smaller areas may be considered as determined by the site professional. • Accurately document the size and geometry of the test pit. • Install a device capable of measuring the water level in the pit during the test. This may be a pressure transducer (automatic measurements) or a vertical measuring rod (minimum 5 feet long) marked in half-inch increments in the center of the pit bottom (manual measurements). B-2.1 • Use a rigid 6-inch-diameter pipe with a splash plate or some other device on the bottom of the pit to reduce side-wall erosion and excessive disturbance of the pit bottom. Excessive erosion and disturbance may result in clogging and yield lower than actual infiltration rates. • Add water to the pit at a rate that will maintain a water level between 3 and 4 feet above the bottom of the pit. Note: A water level of 3 to 4 feet provides for easier measurement and flow stabilization control. However, the depth should not exceed the proposed maximum depth of water expected in the completed facility. Every 15 to 30 minutes, record the cumulative volume and instantaneous flow rate in gallons per minute necessary to maintain the water level at the same point (between 3 and 4 feet) on the measuring rod. This can best be accomplished with an in-flow meter. It can also be accomplished by timing how long it takes to fill a known volume such as a 5 gallon bucket. Add water to the pit until 1 hour after the flow rate into the pit has stabilized (constant flow rate) while maintaining the same pond water level (usually 17 hours). After the flow rate has stabilized, turn off the water and record the rate of infiltration in inches per hour using the pressure transducer or measuring rod, until the pit is empty. E.2 Data Analysis Calculate and record the infiltration rate in inches per hour until 1 hour after the flow has stabilized. Note: Use statistical/trend analysis to obtain the hourly flow rate when the flow stabilizes. This would be the lowest hourly flow rate. E.3 Apply Correction Factor The infiltration rate obtained from the PIT test shall be considered to be a short- term rate. This "short-term" rate must be reduced through correction factors to account for site variability and number of tests conducted, degree of long-term maintenance and influent pretreatment/control, and potential for long-term clogging due to siltation and bio-buildup. The corrected infiltration rate is considered the "long-term" or "design" infiltration rate and is used for all BMP sizing calculations. One exception to the requirement for a correction factor applies to bioretention facilities. Specifically, when imported bioretention soil is used, no correction factor is required for the infiltration rate of the underlying native soil. B-2.2 A minimum infiltration rate correction factor of 2.0 is required for all facilities designed using the PIT method. Correction factors greater than 2.0 should be considered for situations where long-term maintenance will be difficult to implement, where little or no pretreatment is anticipated, or where site conditions are highly variable or uncertain. These situations require the use of best professional judgment by the site engineer and the approval by the City of Seattle. The typical range of correction factors to account for these issues, based on Ecology's guidance, is summarized in Table E-1. In no case shall the design infiltration rate exceed 10 inches per hour. Table E-1. Correction Factors to be Used With In-Situ Infiltration Measurements to Estimate Long-Term Design Infiltration Rates. Partial Correction Issue Factor Site variability and number of locations tested CFv= 1.5 to 6 Degree of long-term maintenance to prevent siltation and bio-buildup CFm = 2 to 6 Degree of influent control to prevent siltation and bio-buildup CFi = 2 to 6 Total Correction Factor(CF)=CFv+CFm+CFi The following discussions are to provide assistance in determining the partial correction factors that may apply. Site variability and number of locations tested —The number of locations tested must be capable of producing a picture of the subsurface conditions that fully represents the conditions throughout the facility site. The partial correction factor used for this issue depends on the level of uncertainty that adverse subsurface conditions may occur. If the range of uncertainty is low—for example, conditions are known to be uniform through previous exploration and site geological factors—one pilot infiltration test may be adequate to justify a partial correction factor at the low end of the range. If the level of uncertainty is high, a partial correction factor near the high end of the range may be appropriate. This might be the case where the site conditions are highly variable due to a deposit of ancient landslide debris, or buried stream channels. In these cases, even with many explorations and several pilot infiltration tests, the level of uncertainty may still be high. A partial correction factor near the high end of the range could be assigned where conditions have a more typical variability, but few explorations and only one pilot infiltration test is conducted. That is, the number of explorations and tests conducted do not match the degree of site variability anticipated. Degree of long-term maintenance to prevent siltation and bio-buildup—The standard of comparison here is the long-term maintenance requirements provided in Appendix J with these requirements would be justification to use a partial correction factor at the low end of the range. If there is a high degree of uncertainty that long-term maintenance will be carried out consistently, or if the B-2.3 Volume 3—Flow Control and Water Quality Treatment Technical Requirements Manual Appendix E maintenance plan is poorly defined, a partial correction factor near the high end of the range may be justified. Degree of influent control to prevent siltation and bio-buildup—A partial correction factor near the high end of the range may be justified under the following circumstances: • If the infiltration facility is located in a shady area where moss buildup or litter fall buildup from the surrounding vegetation is likely and cannot be easily controlled through long-term maintenance • If there is minimal pre-treatment, and the influent is likely to contain moderately high TSS levels. If influent into the facility can be well controlled such that the planned long-term maintenance can easily control siltation and biomass buildup, then a partial correction factor near the low end of the range may be justified. The determination of long-term design infiltration rates from in-situ infiltration test data involves a considerable amount of engineering judgment. Therefore, when reviewing or determining the final long-term design infiltration rate, the local jurisdictional authority should consider the results of both textural analyses and in-situ infiltration tests results when available. Example: The area of the bottom of the test pit is 8.5 feet by 11.5 feet. Water flow rate was measured and recorded at intervals ranging from 15 to 30 minutes throughout the test. Between 400 minutes and 1,000 minutes, the flow rate stabilized between 10 and 12.5 gallons per minute or 600 to 750 gallons per hour, or an average of(9.8 + 12.3) / 2 = 11.1 inches per hour. Applying at least the minimum correction factor of 2.0 (example only) the design long-term infiltration rate becomes 5.6 inches per hour, anticipating adequate maintenance and pre-treatment. E-4 November 2009 B-2.4 APPENDIXC READING THE SOIL From Kitsap County Stormwater Pond Retrofit Design Guidance Manual (2012) c Reading the Soil Complex chemical interactions occur within soil when it comes in contact with water and air. The color and characteristics of a soil can provide general information about how long it has been saturated or inundated. This portion of the manual is a guide to recognizing these soil characteristics, but a soil and/or wetland professional should be contacted to verify what has been observed and to obtain more information. .- Kedoximorphic Features .:'�', . ' =$7' .oils with dark backgrounds and rusty and/or yellow splotches could indicate s soils were saturated for a temporary period of time (2 weeks or a month) and --�� "-6': hen dried out allowing .� .• •;�` � air to enter the soil pores. The rust and yellow splotches ` �. 4 :re referred to as redoximorphic features. These features indicate that iron has Lam• ;�, �, a •one into solution and then been exposed to air; oxidizing the iron and creating - . :F. - ust colors in the soil. If you observe soils with these characteristics, contact a soil ' ;`# ' .r wetland professional to get more information. Depleted Soils • ; r-'- Soils that have a light grey background can be what is referred to as "depleted •1•..., soils." Depleted soils often also contain redoximorphic features (rust and yellow :*,.-r. .„;;:l splotches). Soils exhibiting these characteristics are likely to have been saturated .,r' .. , -. .4. for a longer period (up to several months) than the soils shown in Photo 11. Much o. -- - , ` Y of the iron in these soils has been leached out and down the soil column during the _�,`------- `. x time they are saturated. When soils dry out, air enters the soil's pores and creates - -f - -. .. -G' redoximorphic features (rusty/yellow splotches). Soils with this characteristic may '`- - - - .. '; indicate shallow groundwater is present and affecting drainage of the stormwater { facility. �- :, ,, '�'0? �. Gleyed Soils 4 ;t r` ..z,' ' , t'rt#/-114A. Soils that are saturated or inundated all year round typically have -f,t 1 ., light grey-greenish or bluish colors. Nearly all of the iron and manga- t • r1.r1C nese in these soils have been leached down the soil column leaving ti c'. 4 .r{ . '::. the light grey-greenish, bluish color, indicating permanent or long '�,; r.,' r -- term saturation. Soils that have this characteristic could indicate that ,; %, ! shallow groundwater is present and may affect the drainage of the . . , stormwater facility. Saturated Soils r"' ' ` '~ Soils are saturated when 100 percent of the soil pores are filled with r•_ r _V�/ ,. - water. It can be difficult to determine whether soils are saturated just by .%4,‘A.1.s , " ; looking at them. Once a hole is excavated, soils may be seen glistening =' ' ' ' 1 Of r or water may be pouring out of the side of the hole. This is an indication .." N , u that soils are saturated, but closer observation of the soils is best. If you '".• , y can squeeze water out of the soil easily, it is likelysaturated even if you ' _ '� do not see water pouring out of the side of the hole. Contact a soils or ' , -.� wetland scientist to assist with verification of soil saturation. c-1.1 `'! Shallow Water Table v,,, • • A shallow groundwater table may be present beneath a stormwater pond, at least for part of the year. It is important to recognize that the water levels can rise with rainwater from winter storms, adversely affecting drainage of the stormwater facil- ity. Shallow water tables are typically in low elevation areas near streams or other water bodies. The presence of shallow groundwater can be determined during • the dry season (May through September in western Washington) when the storm- :47- water pond is not receiving much inflow. While the surface of the stormwater facility may be dry, the water table may be just below the surface. Excavate soils to a depth of at least 24 inches to determine if shallow groundwater is present. jr - Leave the soil pit open for at least 30 minutes or an hour to allow the water (if present) to fill up part of the hole, especially if soils are fine-textured such as clay and silt that transmit water slowly. If shallow groundwater fills the soil pit during this test, dig another soil pit elsewhere in the pond bottom, and allow time for wa- ter to fill it in. If pooled water is observed in one or more test pits, it is likely that a shallow water table is present at a similar elevation beneath the entire pond. Well-drained Soils Soils may also be dry below the surface indicating they are well-drained. xJ Excavate a soil pit to at least 24 inches to determine whether soils area, N, - well-drained. Soils that are light or bright in color and that do not have re- ' ` '*:"° Y doximorphic features also indicate well-drained soils. Well-drained soils J are typically coarse-textured such as sandy soils, unless there is a high s ".... , • t ; " water table that keeps soils saturated near the soil surface. Soils that are well drained should be dry during most of the year except within a couple 4- ': days after a rainstorm has occurred. Well-drained soils typically infiltrate rainwater within a short period of time (no longer than a week). C-1.2 APPENDIXD BIOFILTRATION SOIL MIX SPECIFICATION City of Portland Topsoil Specification for Vegetated Stormwater Systems - Appendix F.3 Courtesy of City of Portland Environmental Services Used with permission D-1.1 D-1.2 Biofiltration Soil Mix Specification APPENDIX F.3 TOPSOIL SPECIFICATION FOR VEGETATED STORMWATER SYSTEMS The following specification is taken from the 2010 City of Portland Standard Construction Specifications, as amended or corrected, Facilities include swales, planters, curb extensions, and basins. (1) Standard Blend for Public and Private Facilities NOTE: This specification is required for all public facilities and is recommended as a general guide for private facilities. Testing and submittals are not required for private facilities unless they are requested by the Bureau permitting the work. SCS01040(04-15-13 Excerpt) (This Section May Require SPPI0415) 01040.14 Topsoil - Furnish topsoil containing no substance detrimental to the growth of plants and that is free of plants designated by the Oregon Department of Agriculture as Type "A" or Type "B" weeds. Unsuitable topsoil, or topsoil placed by the Contractor without approval in areas to be planted, may be required to be replaced at no additional cost to the City. (d) Stormwater Facility Topsoil - Furnish imported topsoil for vegetated stormwater facilities conforming to the following: (1) Standard Blend for Public and Private Facilities - Use this blend for all vegetated stormwater management facilities. a. General Composition - The material shall be any blend of loamy soil, sand, and compost that is 30-40% compost (by volume) and meets the other criteria in this specification. b. Analysis Requirements for the Blended Material: 1. Particle Gradation - "A sieve analysis of the blended material, including compost, shall be conducted in conformance with ASTM C117/C136, AASHTO T11/T27, ASTM D422/D1140, or ASTM D6913." The analysis shall include the following sieve sizes: 1 inch, 3/8 inch, #4, #10, #20, #40, #60, #100, #200. The gradation of the blend shall meet the following gradation criteria. Sieve Size Percent Passing 1 inch 100 #4 75 -100 # 10 40-100 #40 15-50 # 100 5-25 #200 5-15 Appendix F.3: Growing Medium Specification F.3-1 Storm water Management Manual—Exerpt Update April 15, 2013 D-1.3 Topsoil Specification for Vegetated Stormwater Systems - Appendix F-3 The blend shall have a Coefficient of Uniformity(D60/D10)equal to or greater than 6 to ensure it is well graded (has a broad range of particle sizes). The coefficient is the ratio of two particle diameters on a grain-size distribution curve; it is the particle diameter at 60%passing divided by the particle diameter at 10%passing. 2. Acidity- The pH (Power of Hydrogen)of the blended material shall be tested and be between 6 to 8. c. General Requirements for the Blended Material: 1. The material shall be loose and friable. 2. It shall be well mixed and homogenous. 3. It shall be free of wood pieces, plastic, and other foreign matter. 4. It shall have no visible free water. d. Compost - The compost shall be derived from plant material and provided by a member of the US Composting Council Seal of Testing Assurance (STA) program. See www.compostingcouncil.org for a list of local providers. The compost shall be the result of the biological degradation and transformation of plant- derived materials under conditions designed to promote aerobic decomposition. The material shall be well composted, free of viable weed seeds, and stable with regard to oxygen consumption and carbon dioxide generation. The compost shall have no visible free water and produce no dust when handled. It shall meet the following criteria, as reported by the US Composting Council STA Compost Technical Data Sheet provided by the vendor. • 100%of the material must pass through a 1/2-inch screen. • The pH of the material shall be between 6 and 8. • Manufactured inert material (plastic, concrete, ceramics, metal, etc.) shall be less than 1.0%by weight. • The organic matter content shall be between 30 and 70%(dry weight basis). • Soluble salt content shall be less than 6.0 mmhos/cm. • Maturity Indicator shall be greater than 80%for Germination and Vigor. • Stability shall be `Stable'to 'Very Stable'. • Carbon/Nitrogen(C/N)ratio shall be less than 25:1. • Trace metals test result="Pass." e. Submittals - At least 14 working days in advance of construction, submit the following: Appendix F.3: Growing Medium Specification F.3-2 Storm water Management Manual—Exerpt Update April 15, 2013 D-1.4 Topsoil Specification for Vegetated Stormwater Systems - Appendix F-3 1. Documentation for the two analyses described in section 01040.14(d)(1)(b) of this specification (particle gradation with calculated coefficient of uniformity; and pH) shall be performed by an accredited laboratory with certification maintained current. The date of the analyses shall be no more than 90 calendar days prior to the date of the submittal. The report shall include the following information: • Name and address of the laboratory. • Phone contact and e-mail address for the laboratory. • Test data, including the date and name of the test procedure. 2. A compost technical data sheet from the compost vendor. The analysis and report must conform to the sampling and reporting requirements of the US Composting Council Seal of Testing Assurance (STA) program. The analysis shall be performed and reported by an approved independent STA program laboratory and be no more than 90 calendar days prior to the date of the submittal. 3. Two 5-gallon buckets of the blended material. 4. A description of the location, equipment, and method proposed to mix the material. f. Stormwater Facility Topsoil Installation- See 01040.43(e). Construction 01040.43 Topsoil: (e) Stormwater Facility Topsoil Installation: (1) Protection of the Topsoil - The material shall be protected from all sources of contamination, including weed seeds, while at the supplier, in conveyance, and at the project site. (2) Placement of the Topsoil - The material shall be placed in loose lifts, not to exceed 8 inches each and each lift shall be compacted with a water-filled landscape roller. The material shall not otherwise be mechanically compacted. (3) Timing of Plant Installation - Weather permitting and as approved, plants shall be installed as soon as possible after placing and grading the topsoil in order to minimize erosion and further compaction. (4) Erosion Control - Temporary erosion control measures are required until permanent stabilization measures are functional. Appendix F.3: Growing Medium Specification F.3-3 Storm water Management Manual—Exerpt Update April 15, 2013 D-1.5 Topsoil Specification for Vegetated Stormwater Systems - Appendix F-3 (5) Protection of the Installed Topsoil - In all cases, the installed material must be protected from foot or equipment traffic and surface water runoff. Temporary fencing or walkways should be installed as needed to keep workers, pedestrians, and equipment out of the area. Under no circumstances should materials and equipment be stored on top of the installation area. (6) Wet and Winter Conditions - Placement of the topsoil will not be allowed when the ground is frozen or saturated or when the weather is too wet as determined by the Owners Representative. Appendix F.3: Growing Medium Specification F.3-4 Storm water Management Manual—Exerpt Update April 15, 2013 D-1.6 APPENDIX E RATIONAL METHOD INFORMATION From City of Lake Oswego Surface Water Management Design Workbook (2003) E CHART 1 STANDARD EQUATIONS SEWER CURVE RADIUS : (Deflected Straight Pipe) All units are in feet. R = DL/G = Radius for a given diameter, laying length and gap R1+a = 48 DL = Radius that will produce a 114" (0.02083') gap G DL 1 R = Gap that will be produced for a given radius, laying length and diameter D Outside diameter of the pipe barrel at the joint (spigot) L Laying length of one section of pipe G Joint gap or opening at the outside edge of the pipe barrel when the pipe is in the deflected position P Radius of the curve on the pipe centerline MANNING'S EQUATION: ( ❑pen Channel Flow ) a = 1.486 AR2" strz 4 _ 0.463 Dar3 Si,2 n Manning's Eq.for circular pipe flowing full n V = 1.486 Rti3 S la V = 0,590 Doss 5vt Q Ouantlty of flow,cubic feet per second ✓ Velocity of flow, feet per second n Manning's coefficient of roughness (see CHART 7) A Cross-sectional area, square feet R Hydraulic radius( area of flow divided by wetted perimeter), feet S Slope of the pipe or energy line,feet per foot D Diameter of pipe, feet RATIONAL METHOD: ( Stormwater Design Flows ) O = CIA (Max.drainage area= 100 acres----Max.time =60 minutes) ❑ Quantity of runoff.cubic feet per second C Coefficient of runoff (ratio of runoff to rainfall ), percent I Intensity of rainfall, inches per hour A Area of tributary drainage basin, acres GUTTER FLOW CAPACITY: Manning's Equation Modified) 0 = 0.56 tJ5x o.5 2 s7 or 0. 6 7,57 So-s Taer V _ 1.12 S°-s Sxa,sa T0 = 0-67 Q Quantity of flow,cubic feet per second S. Street cross slope, feet per foot S Street longitudinal slope,feet per foot n Manning's coefficient of roughness for the gutter, ( normally 0.018 ) d Depth of flow al the curb, feet T Total width of flow in the gutter, Feet TIME OF CONCENTRATION: ( Overland Stormwater Flow ) T = L/60V ( far conversion of velocity to travel time ) To = Tsi +Tc+ Tim Tr 0.42 nt )°s Manning's kinematic solution for sheet flow less than 300 feet ) 1.58 (S )°.4 V = 16,1345 (S)°'5 {Unpaved surfaces) 1 (Shallow concentrated flow for slopes less than 0.005 ft/ft. V = 20.3282 (5)°-5 (Paved surfaces ) For steeper slopes see CHART 9) T, Travel time, minutes L Flow length,feet ✓ Average velocity of flow,feet per second 60 Conversion factor from seconds to minutes TT Total time of concentration, minutes ( minimum Te =5,0 minutes) n Manning's roughness coefficient for various surfaces. (see CHART 10) S Slope of the hydraulic grade line (land or watercourse slope ),feet per foot 1.58 A factor derived from Ref- No. 8 ( Pz from 2 year, 24 hour precipitation chart, for the Portland, Oregon area [P2°.6 = 2 5°.s = 1.58 j) BES August 7, 1990 CHART I E-1.1 CHART 8 MANNING'S n VALUES SURFACE DESCRIPTION DESIGN SURFACE DESCRIPTION DESIGN VALUE VALUE Sheet Flow' ( Max.300') - Paved Streets&Gutters Concrete or asphalt .011 Concrete gutter.trowel finish .012 Bare sand .010 Asphalt pavement Graveled surface ,020 Smooth texture .013 Bare clay - loam ( eroded) .020 Rough texture .018 Grass (short grass prairie ) 2 .15 Conc. gutter w/asph. payment - (dense grass -lawn ) .24 Smooth .013 (bermuda grass ) • .41 Rough .015 Woods 3(light underbrush ) .40 Concrete pavement - (dense - ) .80 Float finish .014 - Notes: 'The sheet flow n values are from Ref. No. 7, Page 3-3 Broom finish 016 and include Information compiled by Engman ( 1986 ). For gutters with a small slope, where sediment may accumulate, Ref.No. 6. 2 These n values are for sheet flow only and are not increase n by 002 appropriate for channel flow. Note: From Rel. No. 9. When selecting n for wooded areas, consider cover to a height of about 0.1 ft.This is the only part of the plant Sewers cover that will obstruct sheet flow. Concrete sewer pipe .013 PVC( polyvinyichloride) ..013 Open Channel ( natural ] HOPE (high density polyethylene) ,013 Clean, straight,full stage,no pools .029 As above with weeds and stones ..035 Culverts Winding, pools &shallows,clean .039 Concrete sewer pipe .013 As above at!ow stages .047 Concrete box culvert .013 Winding.pools& shallows, weeds &stones .042 HDPE (high density polyethylene) .013 As above, shallow stages,large stones .052 Sluggish, weedy, with deep pools .065 Very weedy and sluggish .112 • Note: The open channel(natural) n values are from Linsley, Kohler, Pauihus ( 1982). Ref. No. 16. f Open Channel ( Artificial Changes) I Depth,feet 0.0 - 0.5 05- 0 > 2.0 Concrete ( broom or float finish ) .015 .013 .013 Gunfte .022 .020 .020 Grouted riprap .040 .030 .028 Stone masonry .042 .032 .030 Soil cement .025 .022 .020 Asphalt .018 .016 .016 Bare soil .023 .020 .020 Rock cut .045 .035 .025 Gravel. 1 inch, D5o .044 .033 .030 - 2 inch, No .066 .041 ,034 Rock riprap, 6 inch, D5o .104 .069 .035 - - 12 Inch, Dso NA .078 .040 Note: From Ref. No. 15, Page 37. BES August 7. 1990 CHART 8 E-1.2 CHART 8 MANNING'S n VALUES SURFACE DESCRIPTION DESIGN SURFACE DESCRIPTION DESIGN VALUE VALUE Sheet Flow' ( Max.300') - Paved Streets&Gutters Concrete or asphalt .011 Concrete gutter.trowel finish .012 Bare sand .010 Asphalt pavement Graveled surface ,020 Smooth texture .013 Bare clay - loam ( eroded) .020 Rough texture .018 Grass (short grass prairie ) 2 .15 Conc. gutter w/asph. payment - (dense grass -lawn ) .24 Smooth .013 (bermuda grass ) • .41 Rough .015 Woods 3(light underbrush ) .40 Concrete pavement - (dense - ) .80 Float finish .014 - Notes: 'The sheet flow n values are from Ref. No. 7, Page 3-3 Broom finish 016 and include Information compiled by Engman ( 1986 ). For gutters with a small slope, where sediment may accumulate, Ref.No. 6. 2 These n values are for sheet flow only and are not increase n by 002 appropriate for channel flow. Note: From Rel. No. 9. When selecting n for wooded areas, consider cover to a height of about 0.1 ft.This is the only part of the plant Sewers cover that will obstruct sheet flow. Concrete sewer pipe .013 PVC( polyvinyichloride) ..013 Open Channel ( natural ] HOPE (high density polyethylene) ,013 Clean, straight,full stage,no pools .029 As above with weeds and stones ..035 Culverts Winding, pools &shallows,clean .039 Concrete sewer pipe .013 As above at!ow stages .047 Concrete box culvert .013 Winding.pools& shallows, weeds &stones .042 HDPE (high density polyethylene) .013 As above, shallow stages,large stones .052 Sluggish, weedy, with deep pools .065 Very weedy and sluggish .112 • Note: The open channel(natural) n values are from Linsley, Kohler, Pauihus ( 1982). Ref. No. 16. f Open Channel ( Artificial Changes) I Depth,feet 0.0 - 0.5 05- 0 > 2.0 Concrete ( broom or float finish ) .015 .013 .013 Gunfte .022 .020 .020 Grouted riprap .040 .030 .028 Stone masonry .042 .032 .030 Soil cement .025 .022 .020 Asphalt .018 .016 .016 Bare soil .023 .020 .020 Rock cut .045 .035 .025 Gravel. 1 inch, D5o .044 .033 .030 - 2 inch, No .066 .041 ,034 Rock riprap, 6 inch, D5o .104 .069 .035 - - 12 Inch, Dso NA .078 .040 Note: From Ref. No. 15, Page 37. BES August 7. 1990 CHART 8 E-1.3 CHART 9 AVERAGE VELOCITIES FOR SHALLOW CONCENTRATED FLOW Average Velocity, Feet Per Second 1 2 3 4 5 6 7 8 910 20 .50 ,_ ____._. 50 .40 — E } 40 ,r r r .30 .30 i 1 ` ! I I , +fl .20 I i G-' I .20 r` I • 'r/ -8- .1 a ... . .09 1 1 1 t ;r , ' ; I .09 +a as r`- + L ' .08 a a.71 07 _ - ; - - I } 1 � - - -7-� f . + .07 LL .06 - - , ' .06 di - j;I. C. .05 ' T . _ +_ ' , l .05 a cn _ raa .04 f L i". , I .04 (4) ❑ + - ; + ❑ G f ( • I U 03 Ifit f ► �n f _I ' .03 m �'� 1 l• l I I r I a2 r/ . 1 1 r 49,+� ` , - .02 I i ...' 1 1-0 . I I r _ t - r ' All r .01 l .01 -7 / 1 . ` . ! I--- , 1 I I I • .005 I I 1 1. I I .005 1 2 3 4 5 6 7 8 910 20 Average Velocity, Feet Per Second ' For slopes less than 0.005 filft, use the following equations: V = 16,1345 { S) -5 =fps ( Unpaved surfaces ) V = 20.3282 ( S)115 =fps ( Paved surfaces ) From Ref. No. 7, Fig. 3-1, Page 3-2& Appendix F, Page F-1 BES August 7, 1990 E-1.4 CHART 9 CHART 10 RUNOFF COEFFICIENTS * w % SOIL" DRAINAGE AREA SLOPE TYPICAL LAND USE*" 5 IMPERVIOUS TYPE Under 5% 5%to 10% Over 10% m a A 0.19 0.24 0.29 Zones: OS, RF ~ 0 to 10 B 0.28 0.33 0.38 Other: Parks, Cemeteries& Playgrounds C 0.33 0.43 0.52 A 0.26 0.31 0.36 Zones: R20 10 to 20 B 0.35 0.40 0.45 C 0.39 0.48 0.57 A 0.34 0.39 0.44 Zones: R10 20 to 30 B 0.41 0.46 0.51 C 0,45 0.54 0.62 A 0.41 0.46 0.51 Zones: R7, R5 30 to 40 B 0.48 0.53 0,58 C 0.51 0.59 0.67 A 0.49 0.54 0.59 Zones: R2.5, R3 40 to 50 B 0.54 0.59 0.64 C 0.57 0.65 0.72 A 0.56 0.61 0.66 Zones: R2, CO1 50 to 60 B 0.61 0.66 0.71 Streets: Neighborhood-20' in 35' ROW C 0.63 0.70 0.T7 Other: Schools A 0.64 0,69 0.74 Zones: R1, CN2. CO2 60 to 70 B 0.67 0.72 0.77 Streets: Neighborhood- 24'to 28'in 40'ROW G 0.69 0.76 0.82 32'to 35'in 50' ROW Neighborhood Collector A 0.71 0.76 0.81 Streets: Neighborhood-36'in 50'ROW 70 to 80 B 0.74 0.79 0.84 28'in 40'ROW C 0.75 0.81 0.87 Other: Haspltals A 0.79 0.84 0.89 Zones: RH, CN1, CM, CS, CG, EG1, EG2, IG1, IG2. 80 to 90 B 0.80 0.85 0.90 C 0.81 0.87 0.92 A 0.86 0.91 0.96 Zones: FIX, CX. EX, It- 90 to 100 B 0.87 0.92 0.97 Streets: Community Arterial Commercial C 0.87 0.92 0.97 Paved Portion Of Any Street N ' DRAIN%GE AREA SLOPE ` Run oft coefficients may be adjusted J▪ SURFACE CHARACTERISTICS Under 5% 5%to 10% Over 10% to the nearest 0.05, if adjusted CO consistently throughout the project. Q Woodlands Type A Soil 0.10 0.15 0.20 " Soil Types Type B Soil 0.20 0.25 0.30 A =Gravel&sandy Loam Type C Soli 0.30 0.35 I 0.40 B =Light Clay& Silt Loam Lawns, Pasture And Meadows C =Tight Clay Type A Soil 0.15 0.20 0.25 *"The land uses are typical fora given Type B Soil 0.25 0.30 0.35 percent of impervious surface. Where Type C Sail 0.30 0.40 0.50 there is or will be any significant Cultivated Land variation from typical conditions, Type A Soil 0.25 0.35 0,50 another percentage range should be Type B Soil 0.40 0.55 0.70 used. Type C Soil 0.50 0.65 0.80 Gravel Areas & Walks Loose 0.30 0.40 0.50 Packed 0.70 0.75 0.80 Pavements& Roots 0.90 0.95 1.00 BES August 7, 1990 E-1.5 CHART 10 CHART 17 INTENSITY OF PRECIPITATION FOR 2 YEAR STORM ( FANNO 2 ) AT FANNO CREEK STUDY AREA I - (N 45°29'00"W 122'42'30") Intensity, Inches Per Hour MINUTES .0 .1 .2 .3 .4 .5 .6 .7 .8 .9 5 1.81 1.79 1.78 1.76 1.75 1.73 1.72 1.70 1.69 1.67 6 1.66 1.65 1.63 1.62 1.60 1.59 1.58 1.57 1.55 i 1.54 7 1.53 1.52 1.51 1.50 1.49 1.48 1.47 1.46 1.45 1.44 8 1.43 1.42 1.41 1.41 1.40 1.39 1.38 1.37 1.37 1.36 9 1.35 1.34 1.34 1.33 1.32 1.32 1.31 1.30 1.29 1.29 10 1.28 1.27 1.27 1.26 1.26 1.25 1.24 1.24 1.23 1.23 11 1.22 1.21 1.21 1.20 1.20 1.19 1.18 1.18 1.17 i 1.17 12 1.16 1.16 1.15 1,15 1.14 1.14 1.14 1.13 1.13 1.12 13 1.12 1.12 1.11 1.11 1.10 1.10 1.09 1.09 1.08 1.08 14 1.07 1.07 1.06 1.06 1.05 1.05 1.05 1.04 1.04 1.03 15 1.03 1.03 1.02 1.02 1.31 1.01 1.01 1.00 1.00 0.99 16 0.99 0.99 0.98 0.98 0.97 0.97 0.97 0.96 0.96 0.95 17 0.95 0.95 0.94 0.94 0.93 0.93 0.93 0.92 0.92 0.91 18 0.91 0.91 0.90 0.90 0.90 0.90 0.89 0.89 0.89 0.88 1 , 19 0.88 0.88 0.87 0.87 0.87 0.87 0.86 0.86 0.86 0.85 20 0.85 0.85 0.84 0.84 0.84 0.84 0.83 0.83 0.83 I 0.82 21 0.82 0.82 0.81 0.81 0.81 0.81 0.80 0.80 0.80 0.79 1 1 MINUTES 22 23 24 25 26 27 28 29 1 i i 0.79 0.77 0.75 0.73 0.71 0.69 0.68 0.66 I r MINUTES 30 35 40 I 45 50 60 90 120 ► 0.65 0.59 0.54 0.51 I 0.48 0.43 0.34 0.30 ► Reference: NOAA Atlas No. 2 E-1.6 CHART 18 INTENSITY OF PRECIPITATION FOR 5 YEAR STORM ( FANNO 5) AT FANNO CREEK STUDY AREA . (N 45°29'00"W 122°42'30") Intensity, Inches Per Hour MINUTES .0 .1 .2 .3 .4 .5 .6 .7 .8 .9 5 2.28 2.26 2.23 2.21 2.18 2.16 2.14 2.12 2.11 2.09 6 2.07 2.05 2.04 2.02 2.01 1.99 1.98 1.96 1.95 1.93 7 1.92 1.91 1.90 1.88 1.87 1.86 1.85 1.84 1.82 1.81 8 1.80 1.79 1.78 1.77 1.76 1.75 1.74 1.73 1.72 1.71 9 1.70 1.69 1.68 1.67 1.66 1.66 1.65 1.64 1.63 1.62 10 1.61 1.60 1.59 1.59 1.58 1.57 1.56 1.55 1.55 1.54 11 1.53 1.52 1.52 1.51 1.50 1.50 1.49 1.48 1.47 1.47 12 1.46 1.45 1.45 1.44 1.44 1.43 1.42 1,42 1.41 1.41 13 1.40 1.39 1.39 1.38 1.38 1.37 1.36 1.36 1.35 1.35 14 1.34 1.34 1.33 1.33 1.32 1.32 1.31 1.31 1.30 1.30 15 1.29 1.29 1.28 1.28 1.27 1.27 1.26 1.26 1.25 1.25 16 1.24 1.24 1.23 1.23 1.22 1.22 1.21 1.21 1.20 1.20 17 1.19 1.19 1.18 1.18 1.17 1.17 1.17 1.16 1.16 1.15 18 1.15 1.15 1.14 1.14 1.13 1.13 1.13 1.12 1.12 1.11 19 1.11 1.11 1.10 1.10 1.09 1.09 1.09 1.08 1.08 1,07 20 1.07 1.07 1.06 1.06 1.06 1.06 1.05 1.05 1.05 1.04 21 1.04 1.04 1.03 1.03 1.03 1.03 1.02 1.02 1.02 1.01 MINUTES 22 23 24 25 26 27 28 29 1.01 0.98 0.95 0.92 0.90 0.88 0.86 I 0.84 MINUTES 30 35 40 45 50 60 90 120 0.82 0.75 0.69 0.64 0.60 0.54 0.43 0.37 Reference: NOAA Atlas No. 2 BES August 7, 1990 E-1.7 ( FANNO 5) CHART 18 CHART 19 INTENSITY OF PRECIPITATION FOR 1❑ YEAR STORM ( FANNC 10 ) AT FANNO CREEK STUDY AREA (N 45°29'00"W 122°42'30") intensity, Inches Per Hour MINUTES .0 .1 .2 .3 .4 .5 .6 .7' .8 .9 5 2.60 2.58 2.55 2.53 2.50 2.48 2.45 2.43 2.40 2.38 6 2.36 2.35 2.33 2.32 2.30 2.28 2.26 2.25 2.23 2.22 7 2.20 2.19 2.17 2.16 2.14 2.13 2.11 2.10 2.08 2.07 B 2.06 2.04 2.03 2.02 2.01 2.00 1.99 1.98 1.97 1.95 9 1.94 1.93 1.92 1.91 1.90 1.89 1.88 1.87 1.86 1.85 10 1.84 1.83 1.82 1,81 1.80 1.80 1.79 1.78 1.77 1.76 11 1.75 1.74 1.73 1.72 1.71 1.70 1.70 1.69 1.68 1.68 12 1.67 1.67 1.66 1.65 1.64 1.64 1.63 1.62 1.62 1.61 13 1.60 1.60 1.59 1,58 1.57 1,56 1.56 1.55 1.54 1.54 14 1.53 1.53 1.52 1.51 1.51 1.50 1.50 1.49 1.48 1.48 15 1.47 1.47. ' 1.46 1.46 1.45 1.44 1.44 1.43 1.42 1.42 16 1.41 1.40 1.40 1.39 1.38 1.38 1.37 1.37 1.37 1.36 17 1.36 1.36 1.35 1.35 1.34 1.34 1.33 1.33 1.32 1.32 18 1.31 1.31 1.30 1.30 1.29 I 1.29 1.29 1.28 1.28 1.27 19 1.27 1.27 1.26 1.26 1.25 1.25 1.25 1.24 1.24 1.23 20 1.23 1.23 1.22 1.22 1.22 1.21 1.21 1.21 1.20 1.20 21 1.19 1.19 1.18 1.18 1.18 11.17 1.17 1 1.16 1.16 1.15 MINUTES 22 23 24 25 26 27 28 29 1.15 1.12 1.09 1.06 1.04 1.01 0.99 0.97 MINUTES 30 35 40 45 50 60 90 120 0.95 0.86 0.79 0.74 0.69 0.62 0.49 0.42 Reference: NOAA Atlas Na. 2 BES August 7, 1990 ( FANNO 10 ) CHART 19 E-1.8 0 INTENSITY OF PRECIPITATION FOR 25 YEAR STORM CHART( FANNO 255 ) AT FANNO CREEK STUDY AREA (N45°29'00"W122°42'30") Intensity, Inches Per Hour MINUTES .0 .1 .2 .3 .4 .5 .6 .7 .8 .9 5 3.02 2.99 2.96 2.93 2.90 2.88 2.85 2.82 2.79 2.77 6 2.75 2.73 2.71 2.69 2.67 2.65 2.63 2,61 2.59 2.57 7 2.55 2.53 2.51 2.49 2.48 2.47 2.45 2.44 2.42 2.41 f I 8 2.40 2.38 2.37 2.35 2.34 2.33 2.32 2.30 2.28 2.26 9 2.25 2.24 2.23 2.22 2.21 2.20 2.19 2.18 2.17 2.16 10 2.15 2.14 2.13 2.12 2.10 2.09 2.08 2.07 2.06 2.05 11 2.04 2.03 2.02 2,01 2.00 1.99 1.98 1.97 1.96 1.96 12 1.95 1.94 1.93 1.92 1.91 1.90 1.89 1.88 1.87 1.86 13 1.85 1.85 1.84 1.83 1.83 1.82 1.82 1.81 1.80 1.79 14 1.78 1.78 1.77 1.76 1.76 1.75 1.74 1.73 1.72 1.71 15 1.70 1.70 1.69 1.69 1.68 1.68 1.67 1.67 1.66 1.65 16 1.64 1.64 1.63 1.62 1.61 1.60 1.60 1.59 1.59 1.58 17 1.58 1.57 1.57 1.56 1,56 1.55 1.55 1.54 1.54 1.53 18 1.53 1.52 1.52 1.51 1.51 1.50 1.50 1.49 1.48 1.48 19 1.47 1.47 1.46 1.46 1.45 1.45 1.45 1.44 1.44 1.43 20 1.43 1.42 1.42 1.41 1.41 1.40 1.40 1.39 1.39 1.38 21 1.38 1.38 1.37 1.37 1.37 1.36 1.36 1.36 1.35 1.35 F . MINUTES 22 23 24 25 I 26 27 28 29 1.34 1.30 1.26 1.24 I 1.20 1.18 1.15 1.12 � I MINUTES 30 35 40 45 50 60 90 120 1 } 1.10 1.00 0.92 0.86 0.80 0.72 0.56 0.48 i 1 Reference: NOAA Atlas No. 2 BES August 7, 1990 ( FANNO 25) E-1.9 CHART 20 CHART 21 INTENSITY OF PRECIPITATION FOR 50 YEAR STORM ( FANNO 50 ) AT FANNO CREEK STUDY AREA (N45°29'00" W122°42'30") Intensity, Inches Per Hour MINUTES .0 .1 .2 .3 .4 .5 .6 .7 .8 .9 5 3.43 3.40 3.37 3.34 3.31 3.28 3.25 3.22 3.20 3.17 6 3.14 3.11 3.09 3.06 3.04 3.01 2.99 2.97 2.95 2.93 7 2.91 2.89 2.87 2.85 2.83 2.82 2.80 2.78 2.76 2.74 8 2.72 2.70 2.69 2.67 2.66 2.64 2.62 2.61 2.59 2.58 9 2.56 2.55 2.53 2.52 2.50 2.49 2.48 2.46 2.45 2.43 I 10 2.42 2.41 2.40 2.38 2.37 12,36 2.35 2.34 2.32 2.31 11 2.30 2.29 2.28 2.27 2.26 I 2.25 2.24 2.23 2.22 2.21 12 J 2.20 2.19 2.18 2.17 2.16 2.16 2.15 2.14 2.13 2.12 13 2.11 2.10 2.09 2.08 2.07 2.07 2.06 2.05 2.04 2.03 14 2.02 2.01 2.00 2.00 1.99 1.98 1.97 1.96 1.96 1.95 15 1.94 1.93 1.92 1.92 1.91 1.90 1.89 1.88 1.88 1.87 16 1.86 1.85 1.85 1.84 1.83 1.83 1.82 1.81 1.80 1.80 17 1.79 1.78 1.78 1.77 1.77 1.76 1.75 1.75 1.74 1.74 18 11.73 1.72 1.72 1.71 1.71 1.70 1.69 1.69 1.68 1.68 19 1.67 1.66 1.66 1.65 1.65 1.64 1.63 1.63 1.62 1.62 20 1.61 1.61 1.60 1.60 1.59 1.59 1.58 1.58 1.57 1.57 21 1.56 1.56 1.55 1.55 1.54 1.54 1.54 1.53 1.53 1.52 MINUTES 22 23 24 25 26 27 28 29 1.52 1.48 , 1.44 1.40 1.36 1.33 1.30 1.27 MINUTES 30 35 40 45 50 60 j 90 120 1.24 1.13 1.04 0.97 0.91 0.81 0.64 0.53 Reference! NOAA Atlas No. 2 BES August 7, 1990 ( FANNO 50 ) CHART 21 E-1.10 CHART 22 INTENSITY OF PRECIPITATION FOR 100 YEAR STORM ( FANNC 100 ) AT FANNO CREEK STUDY AREA (N45°29.00••W 122'42.30'•) Intensity, Inches Per Hour MINUTES .0 .1 .2 .3 .4 .5 .6 .7 .8 .9 5 3.75 3.72 3.69 3.66 3.63 3.60 3.57 3.54 3.51 3.48 6 3.45 3.42 3.40 3.37 3.35 3.32 3.30 3.27 3.25 3.22 7 3.20 3.18 3.16 3.14 3.12 3.10 3.08 3.06 3.04 3.02 8 3.00 2.98 2.97 2.95 2.93 2.92 2.90 2.88 2.86 2.85 9 2.83 2.82 2.80 2.79 2.77 2.76 2,74 2.73 2.71 2.70 10 2.68 2.67 2.65 2.64 2.63 2.62 1 2.60 2.59 2.58 2.56 11 2.55 2.54 2.53 2.52 2.51 2.50 2.48 2.47 2.46 2.45 12 2.44 12.43 2.42 2.41 2.40 2.39 2.37 2.36 2.35 2.34 13 2.33 l 2.32 2.31 2.30 2.29 2.28 2.27 2.26 2.25 2.24 14 2.23 2.22 2.21 2.20 2.19 2.19 2.18 2.17 2.16 2.15 15 2.14 2.13 2.12 2.12 2.11 2.10 2.09 2.08 1 2.08 2.07 16 2.06 2.05 2.04 2.04 2.03 2.02 2.01 2.00 2.00 1.99 17 1.98 1.97 1.97 1.96 1.96 1.95 1.94 1.94 1.93 1.93 18 1.92 1.91 1.90 1.90 1.89 1.88 1.87 1.86 1.86 1.85 19 1.84 1.84 1.83 1.83 1.82 1.82 1.81 1.81 1.80 1.80 20 1.79 1.79 1.78 1.78 1.77 1.77 1.76 1.76 1.75 1.75 21 1.74 1.73 1.73 1.72 1.72 1.71 1.70 1.70 1.69 1.69 MINUTES 22 23 24 25 26 27 28 29 1.68 1.64 1.59 1.55 1.51 1.47 1.44 1.41 MINUTES 30 35 40 45 50 60 90 j 120 1.38 1.25 1.15 1.07 1.00 0.89 0.69 0.58 Reference: NOAA Atlas No. 2 ( FANN❑ 100 ) BES August 7, 1990 E-1.11 CHART 22 APPENDIX F SANTA BARBARA URBAN HYDROGRAPH (SBUH) METHOD INPUT DATA Adapted from Portland Stormwater Management Manual (Portland, City of. 2008) F Santa Barbara Urban Hydrograph Method The Santa Barbara Urban Hydrograph (SBUH) method is a single-event model that estimates a flow hydrograph for a representative rainfall event.The SBUH method was developed by the Santa Barbara County Flood Control and Water Conservation District. Applicable to urban areas, it converts design storm incremental excess rainfall depths into instantaneous unit hydrographs and routes them through an imaginary reservoir(Debo and Reese 2003). Elements of the SBUH Method The SBUH method depends on several variables: • Pervious (Ap) and impervious (Aimp) land areas • Time of concentration (TO calculations • Runoff curve numbers (CN) applicable to the site • Design storm Assumptions for these variables must be explained and justified in the design report. Land Area The total area, including the pervious and impervious areas within a drainage basin, shall be quantified in order to evaluate critical contributing areas and the resulting site runoff. Each area within a basin shall be analyzed separately and their hydrographs combined to determine the total basin hydrograph.Areas shall be selected to represent homogenous land use/development units. Time of Concentration Time of concentration,Tc, is the time for a theoretical drop of water to travel from the furthest point in the drainage basin to the facility being designed. (In this case,Tc is derived by calculating the overland flow time of concentration and the channelized flow time of concentration.)Tc depends on several factors, including ground slope, ground roughness, and distance of flow.The formula for determining Tc is found in Appendix E (Chart 1). When calculating Tc,the following limitations apply: • Overland sheet flow (flow across flat areas that does not form into channels or rivulets) shall not extend for more than 300 feet. • For flow paths through closed conveyance facilities such as pipes and culverts, standard hydraulic formulas shall be used for establishing velocity and travel time. (See Chapter 8 for more data on pipe flow rates and velocities.) • Flow paths through lakes or wetlands may be assumed to be zero (i.e.Tc=0). Runoff Curve Numbers • Runoff curve numbers were developed by the Natural Resources Conservation Service (NRCS) after studying the runoff characteristics of various types of land. Curve numbers (CN)were F-1.1 developed to reduce diverse characteristics such as soil type, land usage, and vegetation into a single variable for doing runoff calculations.The runoff curve numbers approved by the City for water quantity/quality calculations are included as Table F-3 of this appendix. • The curve numbers presented in Table F-3 are for wet antecedent moisture conditions. Wet conditions assume previous rainstorms have reduced the capacity of soil to absorb water.Given the frequency of rainstorms in the Lake Oswego area,wet conditions are most likely, and give conservative hydrographic values. Design Storm • The SBUH method also requires a design storm to perform the runoff calculations. For flow control calculations,the City uses a NRCS Type 1A 24-hour storm distribution.This storm is shown in Table F-1.The depth of rainfall for the 2 through 100-year storm events is shown below in Table F-2. Table F-1. NRCS Type 1A Storm Distribution Time Step Rainfall No. Time Distribution # minutes % of Pt 0 0 0.00% 1 10 0.40% 2 20 0.40% 3 30 0.40% 4 40 0.40% 5 50 0.40% 6 60 0.40% 7 70 0.40% 8 80 0.40% 9 90 0.40% 10 100 0.40% 11 110 0.50% 12 120 0.50% 13 130 0.50% 14 140 0.50% 15 150 0.50% 16 160 0.50% 17 170 0.60% 18 180 0.60% 19 190 0.60% 20 200 0.60% 21 210 0.60% 22 220 0.60% 23 230 0.70% 24 240 0.70% 25 250 0.70% 26 260 0.70% 27 270 0.70% F-1.2 Table F-1. NRCS Type 1A Storm Distribution Time Step Rainfall No. Time Distribution # minutes % of Pt 28 280 0.70% 29 290 0.82% 30 300 0.82% 31 310 0.82% 32 320 0.82% 33 330 0.82% 34 340 0.82% 35 350 0.95% 36 360 0.95% 37 370 0.95% 38 380 0.95% 39 390 0.95% 40 400 0.95% 41 410 1.33% 42 420 1.33% 43 430 1.33% 44 440 1.80% 45 450 1.80% 46 460 3.40% 47 470 5.40% 48 480 2.70% 49 490 1.80% 50 500 1.34% 51 510 1.34% 52 520 1.34% 53 530 0.88% 54 540 0.88% 55 550 0.88% 56 560 0.88% 57 570 0.88% 58 580 0.88% 59 590 0.88% 60 600 0.88% 61 610 0.88% 62 620 0.88% 63 630 0.88% 64 640 0.88% 65 650 0.72% 66 660 0.72% 67 670 0.72% 68 680 0.72% 69 690 0.72% 70 700 0.72% F-1.3 Table F-1. NRCS Type 1A Storm Distribution Time Step Rainfall No. Time Distribution # minutes % of Pt 71 710 0.72% 72 720 0.72% 73 730 0.72% 74 740 0.72% 75 750 0.72% 76 760 0.72% 77 770 0.57% 78 780 0.57% 79 790 0.57% 80 800 0.57% 81 810 0.57% 82 820 0.57% 83 830 0.57% 84 840 0.57% 85 850 0.57% 86 860 0.57% 87 870 0.57% 88 880 0.57% 89 890 0.50% 90 900 0.50% 91 910 0.50% 92 920 0.50% 93 930 0.50% 94 940 0.50% 95 950 0.50% 96 960 0.50% 97 970 0.50% 98 980 0.50% 99 990 0.50% 100 1000 0.50% 101 1010 0.40% 102 1020 0.40% 103 1030 0.40% 104 1040 0.40% 105 1050 0.40% 106 1060 0.40% 107 1070 0.40% 108 1080 0.40% 109 1090 0.40% 110 1100 0.40% 111 1110 0.40% 112 1120 0.40% 113 1130 0.40% F-1.4 Table F-1. NRCS Type 1A Storm Distribution Time Step Rainfall No. Time Distribution # minutes % of Pt 114 1140 0.40% 115 1150 0.40% 116 1160 0.40% 117 1170 0.40% 118 1180 0.40% 119 1190 0.40% 120 1200 0.40% 121 1210 0.40% 122 1220 0.40% 123 1230 0.40% 124 1240 0.40% 125 1250 0.40% 126 1260 0.40% 127 1270 0.40% 128 1280 0.40% 129 1290 0.40% 130 1300 0.40% 131 1310 0.40% 132 1320 0.40% 133 1330 0.40% 134 1340 0.40% 135 1350 0.40% 136 1360 0.40% 137 1370 0.40% 138 1380 0.40% 139 1390 0.40% 140 1400 0.40% 141 1410 0.40% 142 1420 0.40% 143 1430 0.40% 144 1440 0.40% 145 1450 0.00% 146 1460 0.00% 147 1470 0.00% 148 1480 0.00% 149 1490 0.00% 150 1500 0.00% 151 1510 0.00% 152 1520 0.00% 153 1530 0.00% 154 1540 0.00% F-1.5 Table F-2. City of Lake Oswego Precipitation Design Storm/Recurrence 24-Hour Rainfall Depth (inches) Interval (years) Water Quality 1.0 2-year 2.38 5-year 2.85 10-year 3.20 25-year 3.73 50-year 4.13 100-year 4.54 500-year 5.55 Source: Otak 2009. Soils and Curve Numbers Soil information can be found in the latest Soil Survey for Lincoln County, Oregon Soil information may be obtained electronically from the USDA Natural Resources Conservation Services(NRCS)websoil survey http://websoilsurvey.nrcs.usda.gov/app/HomePage.htm Select Start WSS Navigate by:State and County(Oregon; Lincoln) Define your area of interest(AOI) using the graphic tool Determine the portions of the site that fall under each of the 4 hydrologic soil groups - Hydrologic Soil Groups Soils having a high infiltration rate(low runoff potential)when thoroughly wet(deep,well drained to Group A. excessively drained sands or gravelly sands). Soils having a moderate infiltration rate when thoroughly wet(moderately deep or deep, moderately well Group B. drained or well drained soils that have moderately fine texture to moderately coarse texture) Soils having a slow infiltration rate when thoroughly wet(soils having a layer that impedes the downward Group C. movement of water or soils of moderately fine texture or fine texture) Soils having a very slow infiltration rate(high runoff potential)when thoroughly wet(clays that have a high shrink-swell potential,soils that have a high water table,soils that have a claypan or clay layer at or near the Group D. surface, and soils that are shallow over nearly impervious material) F-1.6 Table F-3. Runoff Curve Numbers Approved by the City Curve Numbers for Hydrologic Soil Group Description A B C D Open space(lawns,parks,golf courses,cemeteries) Poor condition (<50%grass coverage) 68 79 86 89 Fair condition (50 to 75%grass coverage) 49 69 79 84 Good condition (>75%grass coverage) 39 61 74 80 Impervious Areas Paved areas(parking lots, roofs,driveways) 98 98 98 98 Streets and roads Paved with curbs 98 98 98 98 Paved with open ditches 83 89 92 93 Gravel 76 85 89 91 Dirt 72 82 87 89 Urban Districts Commercial and business(85%impervious) 89 92 94 95 Industrial (72%impervious) 81 88 91 93 Residential districts by average lot size 1/8 acre or less(65%impervious) 77 85 90 92 1/4 acre(38%impervious) 61 75 83 87 1/3 acre(30%impervious) 57 72 81 86 1/2 acre(25%impervious) 54 70 80 85 Source:SCS 1986. Urban Hydrology for Small Watersheds. USDA Soil Conservation Service Engineering Division TR-55. June 1989. F-1.7 APPENDIX G RIGHT TREE RIGHT PLACE G ., ... • , .,-„,. - CITY OF LAKE OSWEGO RIGHT \ , \ „„. .11‘ TREE RIGHT PLACE i ',,,,,,,', * .'7.• c..'-' = .. 11114111414-111 " . , . 1114, .s, -. ' i 1. • — Ne.,-,. - .. . - i4 • / 41, ,m: / - --..... . ,,,.... . , .. rca.' -_.•‘, i. - _, , _. • . '--0, N '-- 1 -• 4.,"'',.:,- „ , '•., VI 0 mil , , ,,, , ... II 4 11 \ • 10( .t., ' 110 .'• , 6.:,...NA,,•. . ''.. .4". . .0' , i •, 1 . . 1 II lige .. , • I ....&" 4,0* • G-1 1 CONTENTS Benefits of Trees 3 Selecting a Tree 't 4 Planting Distances from Power Lines 5 Recommended Tree Species: .. rys11134, yrrt for 2'-4' wide planting spaces ' 6 _ 1 for4'-6' wide planting spaces \4 8 for 6'-8' wide planting spaces ,(, 12 } for 8-io' wide planting spaces 16 for lo' wide +planting spaces 18 Proper Planting and Care 22 Avoiding Problems 24 Resources 25 ik i . y '4,y yv ,. fii is 4i 1 t 1 I 9 G-1.2 BENEFITS OF TREES Trees improve the appearance and quality of life in Lake Oswego's neighborhoods. But did you know they also help reduce stormwater runoff, filter pollutants, add oxygen to the air we breathe, and decrease glare from roadways? For example, Lake Oswego's street tree canopy (representing 13% of the total 44% citywide tree canopy cover) intercepts about 50 Olympic-size swimming pools worth of rainfall annually based on data compiled in the City's 2009 State of the Urban Forest Report. Conserving existing trees and planting new trees help reduce the size and cost of hard infrastructure that is otherwise necessary for stormwater management. 7 �4.. \ ?r ,ter.i i 'l i' y, + Vi z'40- i r ' . te i ��+I ,,., 1 7 f . f f.,.,..; . „.>,,,,,.. ....,,,,,-4,-,,,,,.1 , / , k ~i 1,1 1, { 3. ( -f T M r' 't (7 141 ,• , �. r n y :ON.., f Sa - A;7r r G-1.3 SELECTING A TREE Before selecting a tree to plant, a number of factors should be considered to ensure that an optimum species is chosen based on the site conditions of the available growing space. Choosing the right tree for the right place is a decision that will have an impact on the neighborhood for decades to come. Answering these questions can help you select the most suitable and desirable tree species for your site: 1. What is the size of the available growing space? 2. What size (small, medium, or large mature height and spread) and form (crown shape) of tree will best fit the space provided? 3. Are there overhead or underground utility lines, sidewalks, driveways, courtyards, sports courts, or building foundations in the vicinity? 4. Does the site receive full sun, full shade, or part sun and part shade throughout the day? 5. Is the soil deep, fertile, and well drained, or is it shallow, compacted, and infertile? 6. Do you have time to water and prune the newly planted tree until it is established, or will you be relying on a garden or tree service for assistance? 7. Is the site exposed to frequent winds? 8. Are there other trees in the vicinity? �'„( v �/ 9. Do you want the tree to provide shade or seasonal color, attract wildlife, or act as a screen? 10. Do you have a preference for evergreen trees or deciduous trees that lose their leaves? NEED ADVICE? Unsure about the answers to any of these questions? Contact your local garden center, a consulting arborist, or a landscape architect. Receiving assistance from a professional before making a decision will save you time and money by planting the right tree in the right place the first time. This guidebook will help you narrow down your options for choosing the right tree in the right place. The recommended trees are just a sample of what may be available. See page 25 for a list of resources to help you learn more about each species, and visit your local nursery before making a final decision. 4 G-1.4 PLANTING DISTANCES FROM POWER LINES Tall Zone Medium Zone Short Zone 50'or more from 25'-50' from Less than 25' from power lines power lines power lines No height limit Mature tree heights Mature tree heights less than 50' 25' or less J 50 high ti 25' • high 4 ee i sit iltr Elt 411- G-1.5 2' - 4' WIDE PLANTING SPACES Recommended Species Mature Mature COMMON NAME SPECIES NAME Shape Size Height DECI DUOUS TREES Amur Maple Acerginnala i 20' Flame Maple Acerginnala 'Flame' Ilk S 20' [Rocky Mountain Glow Maple Acergrandidentatum 'Schmidt' 1125' Paperbark Maple Acergriseum 110 S 20 Japanese Maple Acer palmatum 41, S Roughbark Maple Acer triflorum 41111S 20' [Frans Fontaine Hornbeam Carpinus betulus 'Frans Fontaine' 1 S Cornelian Cherry Dogwood Corpus mas dirlw S 20' Eddies White Wonder Dogwood Corpus nuttalli x corpus florida ' S Grace Smoketree Cotinus coggygria x obovatus 'Grace' Ilk S 20' American Smoketree Cotinus obovatus Black Hawthorn Crataegus douglasii 411S 25' Crimson Cloud Hawthorn Crataegus laevigata 'Crimson Cloud' al Wedding Bells Silverbell Halesia carolina 'Wedding Bells' 1 S 20' ICo1um Goldenchain Laburnum anagyroides 'Columnaris' If Adirondack Crabapple Malus 'Adirdondack' 'i S 18' !Purple Prince Crabapple Malus 'Purple Prince' al Red Barron Crabapple Malus 'Red Barron' 1 S 18' Golden Raindrops Crabapple Malus 'Schmidtcutleaf' • Prariefire Crabapple Malusspp. 'Prariefire' 4101S 20' `Tschonoskii Crabapple Malus tschonoskii Chinese Pistache Pistachio chinensis OakS 25' 'Beauty Plum Semi-Dwarf Prunus salicinia 'Beauty' Amanogawa Cherry Prunus serrulata 'Amanogawa' 1 S 20' IBig Cis Plum Prunus x cistena 'Schmidtcis' lal Spire Cherry Prunus x hilleri t! S 30' Japanese Stewartia Stewartia pseudocamellia Japanese Snowbell Stryaxjaponicus 4 S 25' Snowcone Japanese Snowbell Styrax japonicus JFS-D' 1101S Ivory Silk Japanese Tree Lilac Syringa reticulata 'Ivory Silk' 0Ilk S 20' Summer Sprite Linden Tilia cordata 'Halka' AlS 20'RE 6 G-1.6 Full Sun• Part Sun, Part Shade• # =OK to plant under overhead utility lines Full Shade• (0 = Not OK to plant under overhead utility lines Mature Spread Soil Type Sun # Remarks 20' all ••• # Very hardy,fall color,attracts wildlife 20' all •• # Fall color,early to leaf out in spring,fragrant flowers 15' well drained •• # Great fall color 20 all ••• 4 Attractive peeling bark, red or multi-colored in fall 6' all •• # Fall color, many varieties such as'Butterfly'and 'Sango Kaku' 20' loam or sand •• # Fall color,textured bark 15' all • O Narrowest of the Carpinus b. cultivars 20' clay or loam •• # Gold or red in fall, resistant to Verticillium 20' all •• # Hybrid of the native dogwood generally more resistant to anthracnose 15' all • # Outstanding summer and fall color 30' all • ® Tolerant of hot and dry sites,attractive fall color,purple flower clusters 15' all •• # Showy flower,conspicuous thorns,attracts wildlife 18' all •• # Thorny branches, red flower, red fruit 15' all •• # White bell-shaped flowers,yellow fall foliage 10' moist • # Narrow upright crown,dense clusters of bright yellow flowers in spring 10' all •• # Compact dense crown with many white flowers 20' all • # Purple bronze foliage, rose red flower 8' all •• # Narrow ascending branch structure,purple-green foliage,dark red flower 15' all •• # Unique leaves,white flowers,small golden yellow fruit 20' all • # Disease resistant,attracts wildlife 15' all •• ® Bright orange fall color,pink flower,attracts wildlife 25' all •• # Impressive red-orange fall color,attracts wildlife 15' all • # Large fruit early summer,needs regular pruning 6' all •• # Very narrow and upright structure,pale pink spring flowers 12' all •• # Light pink and very fragrant spring flowers,dark purple foliage 10' all •• # Very narrow upright structure,orange-red fall color,pink flowers in spring 25' well drained •• ® Needs ample water,striking bark,vibrant red fall color 25' well drained •• # White flowers hang down from branches,fruit hangs on into fall 20' well drained • # Pendulous white flowers,water weekly for first three summers 15' well drained •• # Showy,creamy white flowers,attracts wildlife 15' all •• # Dense compact crown,sheared appearance,yellow fall color 110 Round /Oval i Pyramidal !Vase iiritb Umbrella I Columnar G-1.7 4' - 6' WIDE PLANTING SPACES Recommended Species Mature Mature COMMON NAME SPECIES NAME Shape Size Height DECI DUOUS TREES Trident Maple Acer buergeranum 'i S 20' Hedge Maple Acer campestre 1111M 30' David's Maple Acerdavidii alS 25' Red Sunset Red Maple Acer rubrum 'Red Sunset' 1 M 45' Apollo Maple Acersaccharum 'Barrett Cole' 1 S 25' Tatarian Maple Acer tataricum 1 S 25' Pyramidal European Hornbeam Carpinus betulus 'Fastigiate' 1 M 40' American Hornbeam Carpinus caroliniana $ 'r S 30' Japanese Hornbeam Carpinus japonica 111, S 25' Redbud Cercis canadensis 11111PS 25' Chinese Fringetree Chionanthus retusus $ S 25' Glorybower Tree Clerodendrum trichotomum 'i S 25' June Snow Giant Dogwood Corn us controversy 'June Snow' 0 S 30' Kousa Dogwood Corn us kousa 'National'or'Satomi + S 25' Chinese Dogwood Corn us kousa var. chinensis S 30' Washington Hawthorn Crataegusphaenopyrum • S 25' Dawyck Purple Beech Fagus sylvatica 'Dawyck Purple' 1 M 40' Purple Fountain Beech Fagus sylvatica 'Purple Fountain' 1 M 25' Autumn Applause Ash Fraxinus americana Autumn Applause' II M 60' Autumn Purple Ash Fraxinus americana 'Junginger' el, M 45' Golden Desert Ash Fraxinus excelsior'Aureafolia' 101 S 20' Flowering Ash Fraxinus ornus alS 25' Princeton Sentry Ginkgo Ginkgo biloba 'Princeton Sentry' 1 M 40' Goldenrain Tree Koelreuteria paniculata all" M 35' Arnold Tuliptree Liriodendron tulipifera 'Arnold' I S 30' Amur Maackia Maackia amurensis l M 25' Elizabeth Magnolia Magnolia acuminata 'Elizabeth' S 25' Kobus Magnolia Magnolia kobus 1111M 40' Merrill Magnolia Magnolia x loebneri 'Merrill' al ` S 25' Marilee Crabapple Malus 'Jarmin' 111S 24' Red Jewel Crabapple Malus 'Jewelcole' A, S 15' 8 List continues on Page 10 G-1.8 Full Sun• Part Sun, Part Shade• # =OK to plant under overhead utility lines Full Shade• O = Not OK to plant under overhead utility lines Mature Spread Soil Type Sun # Remarks 25' all ••• # Fall color,attractive exfoliating bark,tolerant of urban stresses 30' well drained •• # Striking bark,varieties include Queen Elizabeth and Metro Gold 25' moist •• # Fall color,attractive striped bark 30' wet to moist •• O Attractive bark, red or orange fall color, provide good drainage in clay soil 10' all •• O Unique narrowness,compact branching,fall color 15' all •• # Tolerant of urban stresses,fall color,compact crown 30' clay or loam •• 0 Provides good screening,attractive fall color 25' clay or loam •• O Needs ample water 25' well drained •• # Attractive foliage,usually trouble free 25' all •• # Pink flowers in spring before leaves emerge 25' well drained •• # Showy flower,fruit attracts birds,generally requires little maintenance 20' well drained • # Colorful flowers in summer,blue berries in fall,fruit attracts birds 40' well drained •• O Showy flower,wide spreading,attractive fall color,attracts wildlife 25' clay or loam •• # Red,gold,or multi-colored in fall,resistant to Verticillium 20' all • # Attractive bark,showy flower,fall color 20' all •• # Attractive fall color,orange-red fruit matures in winter and attracts birds 15' all •• O Deep purple foliage with no change in fall,attractive bark 15' well drained • O Weeping foliage is deep purple with no change in fall 40' all •• O Fall color,this is a seedless ash variety 40' well drained • B Fall color,this is a seedless ash variety 20' all •• # Golden twigs,fall color 25' all •• # Fragrant flowers,prolific seed producer 15' all •• 0 Non-fruiting,fragrant flower,bright yellow fall color 35' all •• O Tolerant of urban stresses,showy yellow flowers 10' all • O Fast grower,narrow crown,susceptible to aphids 20' well drained • # Showy flowers,gold fall color 15' all • O Yellow flower 30' well drained •• O Showy,fragrant flower 25' all •• B Fragrant white flower 10' all •• # Pink buds open to white blooms,generally fruitless,narrow crown 12' all •• # Bright red fruit through winter,abundant white spring flowers 410/Round A Oval Pyramidal !Vase Umbrella # Columnar G-1.9 4' — 6' WIDE PLANTING SPACES - Continued Mature Mature COMMON NAME SPECIES NAME Shape Size Height DECI DUOUS TREES Vanessa Persian Ironwood Parrotia persica 'Vanessa' 'r 30' Crimson Pointe Plum Prunus cerasifera 'Cripoizam' IS S 25' hiro Plum Semi Dwarf Prunus saliciniamoor. 25' Canada Red Chokecherry Prunus virginiana 'Canada Red' alS 25' Chanticleer Pear Pyrus calleryana 'Chanticleer' a 40' Jack Pear Pyrus calleryana 'Jackzam' SS S 16' Hosui Asian Pear Pyrus pyrifolia 'Hosui' 1 S 15' Crimson Spire Oak Quercus alba x Q. robur'Crimschmidt' 1 M 45' Forest Green Oak Quercus frainetto 'Schmidt' $ M Skyrocket Oak Quercus robar'Fastigiata' 14 M 45' Cascara Rhamnus purshiana I 11411or Summer Charm Tree Lilac Syringa pekinensis 'Summer Charm' I� S 20' Chancellor Linden Tilia cordata 'Chancellor' 4 1 djri Corinthian Linden Tilia cordata 'Corzam' 1 M 45' Greenspire Linden Tilia cordata 'Greenspire' 4 Sterling Silver Linden Tilia tomentosa 'Sterling' S M 40' Emerald Sunshine Elm Ulmus propinqua VS-6ieberich' M City Sprite Zelkova Zelkova serrata 'City Sprite' ! S 24' Columnar Zelkova Zelkova serrata 'Musashino' I T M 45' EVERGREEN TREES Edith l3ogue Magnolia Magnolia grandiflora 'Edith L3ogue' 1 M 30' NOTES .w_ 10 G-1.10 Full Sun• Part Sun, Part Shade• # =OK to plant under overhead utility lines Full Shade• O = Not OK to plant under overhead utility lines Mature Spread Soil Type Sun # Remarks 15' well drained •• # Beautiful bark and fall color,slow growing and long-lived 10' all •• # Narrow crown,pink buds open to white blooms,purple foliage all # Large fruit,showy white flower 20' well drained •• # Red leaf,white spring flower,attracts wildlife 15' 0 all • O Abundant white flowers in early spring 10' all • # Dwarf,low maintenance,blooms late,misses many early frosts &fungal blights 10' all • # Produces delicious edible fruit,attracts butterflies 15' well drained • B Narrow crown, rusty red fall color 30' all • 0 Deep green glossy foliage,attracts wildlife 15' well drained • B Narrow and upright form all ••• B Showy flower,textured bark,attracts wildlife 20' all •• # Glossy foliage,sprays of creamy white flowers,yellow fall color 2 0 Fragrant showy flower,gold fall color 15' all •• B Narrowest of the linden cultivars all 0 Dense round crown,good symmetry 30' all _ •• 1 0 Tolerates hedging IMIIII all •• 0 Yellow fall color with purple tips,strong upright structure 18' all •• # Dense compact crown, low maintenance 15' all •• B Fine textured leaves,yellowish-red to rusty-red fall color 15' all ••• B Broadleaf evergreen,showy flower Round Oval A Pyramidal Vase la" Umbrella Columnar ..tA II G-1.11 6' - 8' WIDE PLANTING SPACES Recommended Species Mature Mature COMMON NAME SPECIES NAME Shape Size Height DECI DUOUS TREES Red Maple Acerrubrum A 01j M ji. 50' Autumn Flame Red Maple Acer rubrum 'Autumn Flame' IillM 45' 0--wir-- Bowhall Red Maple Acerrubrum '6owhall' r M iir 45' October Glory Red Maple Acer rubrum 'October Glory' $ M 45' Sugar Maple Acersaccharum 110 M Green Mountain Maple Acersaccharum 'Green Mountain' a 0 M 50' European Hornbeam Carpinus betulus At M Hackberry Celtis occidentalis , 'r M 50' Katsura Cercidiphyllum japonicum 010124r4wM American Yellowwood Cladrastis kentukea 4111 M 35' Paul's Scarlet Hawthorn Crataegus laevigata 'Paul's Scarlet' , Lavelle Hawthorn Crataegus x lavallei If S 30' Dove Tree Davidia involucrata J T Tricolor Beech Fragus sylvatica 'Roseomarginata' $ M 40' Raywood Ash Fraxinus oxycarpa 'Raywood' 111 Summit Ash Fraxinus pennsylvanica 'Lanceolata' $ M 45' Patmore Ash Fraxinus pennsylvanica 'Patmore' , M Saratoga Ginkgo Ginkgo biloba 'Saratoga' A, M 35' Autumn Gold Ginkgo Ginkgo biloba 'Autumn Gold' W T. L Halka Ginkgo Ginko biloba 'Halka' 401M 45' Honey Locust Gleditsia triacanthos var. inermis 41111* - Galaxy Magnolia Magnolia 'galaxy' A, M 30' Yulan Magnolia Magnolia denudata 411M 35' III Black Tupelo Nyssa sylvatica A M 45' David Odom Afterburner Tupelo Nyssa sylvatica 'David Odom' M 45' I American Hophornbeam Ostrya virginiano $ M 35' Sourwood Oxydendrum arboreum $ M 30'OM Amur Cork Tree Phellodendron amurense 11401M 40' Mt. St. Helens Plum Prunus 'Frankthrees' 401! ..i...iiiM Newport Plum Prunus 'Newport' IS¶ S 20' Snow Goose Cherry Prunus 'Snow Goose' r! S 201.11. 12 List continues on Page 14 G-1.12 Full Sun• Part Sun, Part Shade• # =OK to plant under overhead utility lines Full Shade• 0 = Not OK to plant under overhead utility lines Mature Spread Soil Type Sun # Remarks 40' all •• 0 Fall color,varieties such as'Armstrong','Bowhall','Franksred','Morgan','Scarsen' 45' wet to moist •• 0 Attractive bark, red or orange fall color, provide good drainage in clay soil 20' well drained •• 0 Multiple upright branch structure susceptible to breakage 30' well drained •• 0 Red,gold,or orange fall color,good shade tree or street tree 40' all •• 0 Source of maple syrup, multi-colored in fall 40' all •• 0 Tolerant of heat and drought,gold fall color 40' clay or loam •• 0 Dense crown,provides good screening,attractive fall color 35' all ••• 0 Drought tolerant, late to leaf-out in spring,attractive fall color,textured bark 40' loam or sand •• 0 Requires moist soils,attractive foliage and fall color 35' all • 0 Fragrant,white,showy pendulous flowers,fall color 20' all • # Thorny branches,double rose flowers 20' well drained • # Drought tolerant,showy spring flowers,orange fruit attracts birds 30' well drained •• 0 Dove-like flowers 20' well drained • 0 Leaves are variegated with pink,white,and green,with no change in fall 30' all • 0 Tolerant of urban stresses,dense crown,attractive fall color 25' all •• 0 Seedless variety,glossy green foliage,yellow fall color 35' all •• 0 Uniform upright branching 30' all •• 0 Central leader with upright narrow form 30' all •• 0 Non-fruiting,gold fall color 40' all •• 0 Uniform and symmetrical branching 35' all •• 0 Thornless variety,tolerant of urban stresses 15' all • 0 Showy pink flowers 35' all •• 0 Creamy white,fragrant flowers 20' well drained •• 0 Fall color,textured bark,attracts wildlife 20' well drained •• 0 Named in memory of LO City Arborist David Odom,unique upright structure 25' all •• 0 Attractive exfoliating bark,good fall color,fruit resembles hops 20' well drained •• 0 White midsummer flowers 30' all •• 0 Fragrant leaves and fruit,early leaf drop 20' all •• # Dense crown,purple foliage emerges early, light pink flowers 20' all •• # Upright spreading crown,purple-red foliage, light pink flowers 20' all •• # Upright crown becomes wider with age,white flowers 4101 Round /Oval A Pyramidal !Vase 4rIP Umbrella 1 Columnar G-1.13 6' - 8' WIDE PLANTING SPACES - Continued Mature Mature COMMON NAME SPECIES NAME Shape Size Height DECI DUOUS TREES Thundercloud Plum Prunus cerasifera 'Thundercloud' $ S 20' Columnar Sargent Cherry Prunussargentii 'columnaris' IV M 35' Akebono Yoshino Cherry Prunus xyedoensis 'Akebono' 411119.¶ S 25' Chojuro Asian Pear Pyrus pyrifolia 'Chojuro' e M 30' Sawtooth Oak Quercus acutissima 1111i' ` M 40' Swamp White Oak Quercus bicolor 0 M 60' Skymaster Oak Quercus robur 'Skymaster' M 50' Shumard Oak Quercusshumardii 111M 50' Pacific Willow Salix lucida ssp. lasiandra 1 M 40' Beijing Gold Tree Lilac Syringa pekinensis 'Zhang Zhiming' S 20' Redmond Linden Tilia americana 'Redmond' is, L 60' Harvest Gold Linden Tiliacordataxmongolica'Harvest Gold' A M 40' Frontier Elm Ulmuscarpinifolia x U.parvofolia'Frontier' 1! M 40' Prospector Elm Ulmus wilsoniana lirM 40' Patriot Elm Ulmus 'Patriot' M 50' Green Vase Zelkova Zelkova serrata 'Green Vase' 1 M 50' Village Green Zelkova Zelkova serrata 'Village Green' M 40' Wireless Zelkova Zelkova serrata 'Schmid tlow' S 24' EVERGREEN TREES Marina Madrone Arbutus 'Marina' $ 'r ! M 30' Shore Pine Pinus contorta i, M 35' Arnold Sentinel Austrian Pine Pinus nigra 'Arnold Sentinel' 1 S 30' Fastigiate White Pine Pinus strobus 'Fastigiata' 1 M 40' Pacific Yew Taxus brevifolia 'i M 40' . ,“n l' VC, 4 .,Y' 6 NOTES ! t rf.,e: 1, 14 G-1.14 Full Sun• Part Sun, Part Shade• # =OK to plant under overhead utility lines Full Shade• 0 = Not OK to plant under overhead utility lines Mature Spread Soil Type Sun # Remarks 20' all •• # Retains deep purple leaf color through the growing season,pink flowers 15' well drained • 0 Pink flowers, reddish bark 25' moist •• # Showy spring flower 15' all • ® Edible fruit, needs regular pruning 40' all • 0 Bronze fall color or no change 25' all • 0 Upper and lower leaf surfaces contrast in color,attracts wildlife 25' all •• 0 Provides good screening 40' moist • 0 Thrives in areas with poor drainage,attracts wildlife 30' moist • ® Tallest native willow 20' all •• # Upright spreading crown,sprays of yellow flowers in June 30' all •• 0 Heart-shaped leaf,yellow fall color 30' all •• 0 Attractive bark, bright golden yellow fall color 30' all •• 0 Substitute for American elm due to pest and disease resistance 30' well drained •• 0 Substitute for American elm due to pest and disease resistance 40' all •• 0 Substitute for American elm due to pest and disease resistance 40' all •• 0 Orange-brown to bronze-red fall color 38' all • 0 Bronze or red fall color 36' all •• # Broadly spreading v-shaped crown,attractive red fall color 30' all •• 0 Broadleaf evergreen,showy flowers,attractive red-brown bark 20' all •• 0 Dark green needles 10' all • 0 Dense foliage,narrow crown,slow growing 10' well drained • 0 Narrow form,plant in groups to create a hedge 30' all ••• 0 Drought tolerant 10 ltil Round I Oval A Pyramidal IF Vase C Umbrella Columnar I5 G-1.15 81 — i 0' WIDE PLANTING SPACES Recommended Species Mature Mature COMMON NAME SPECIES NAME Shape Size Height DECIDUOUS TREES lState Street Miyabe Maple Acermiyabei 'Morton' M 50' Heritage River Birch l3etulanigra 'Heritage' A. 0 M 45' IPaper Birch l3etula papyrifera I. M 50' Hardy Rubber Tree Eucommiaulmoides 101M 50' IRivers Purple Beech Faguas sylvatica 'Riversii' r M 50' European Beech Fagus sylvatica M 50' rUrbanite Ash Fraxinus pennsylvanica 'Urbanite' 11 L 50' Kentucky Coffeetree Gymnocladus dioicus L 50' Tulip Tree Liriodendron tulipifera le L 60' Dawn Redwood Metasequoia glyptostroboides 4 L 75' It3loodgood London Planetree Platanus x acerifolia '6loodgood' AO L 50' Yoshino Flowering Cherry Prunus xyedoesis 40 air M 3o' 1 Scarlet Oak Quercus coccinea A L 75' Bur Oak Quercus macrocarpa li L 65' ' American Linden Tilia americana .te4rir L 60' Accolade Elm Ulmus japonica x wilsoniana 'Morton' ¶ L 60' [Pioneer Elm Ulmus 'Pioneer' 101L 50' Zelkova Zelkova serrata 11114rL 65' EVERGREEN TREES Lodgepole Pine Pinus contorta var. latifoliaAt L 50' Scotch Pine Pinussylvestris At L 50' Western Red Cedar Thuja plicata A L 70' IIIIIIMIMI,MMuumallhiwmrrodittmuoeot • NOTES 1 6 G-1.16 Full Sun• Part Sun, Part Shade• # =OK to plant under overhead utility lines Full Shade• 0 = Not OK to plant under overhead utility lines Mature Spread Soil Type Sun # Remarks 31 well drained •• ® Attractive bark,yellow fall color,good heat and drought tolerance 30' all •• ® Attractive bark,gold in fall 311. loam or sand ••• ® Poor drought tolerance,attractive bark 50' loam •• ® Rubber is extracted from the wood 40' all •• ® Deep purple foliage with no change in fall,attractive bark 40' well drained • 0 Beautiful bark,aphids may be problematic 40' all •• ® Seedless variety,yellow-bronze fall color 40' all •• O Fragrant flowers,seed pods are toxic when ingested by humans 30' all •• 0 Beautiful fall color,susceptible to aphids 35' well drained • 0 Textured bark,deciduous conifer 40' all • 0 Attractive bark,yellow fall color ' 30' well drained • # Showy spring flower 40' all • 0 Scarlet fall color,can garden beneath canopy I 50' all • 0 Upright crown becomes round and spreading with maturity,attracts wildlife 30' all •• 0 Fragrant flower,gold fall color I 40' all •• 0 Substitute for American elm due to pest and disease resistance 50' all •• 0 Substitute for American elm due to pest and disease resistance 50' all •• 0 Bronze,red,gold,or multicolored in fall 25' well drained •• 0 Medium green needles 130' all • 0 Striking red-orange bark 25' well drained ••• 0 Attractive bark,branches droop and turn upright,attracts wildlife 11/1 IIP Round /Oval A Pyramidal Vase Illy Umbrella Columnar 17 G-1.17 10' WIDE+ PLANTING SPACES Recommended Species Mature Mature COMMON NAME SPECIES NAME Shape Size Height DECI DUOUS TREES Bigleaf Maple Acermacrophyllumi 5' Catalpa Catalpa speciosa ' ` IiirL 60' White Ash Fraxinus americans 60' Oregon Ash Fraxinus latifolia L 60' Green Ash Fraxinus pennsylvanicac Maidenhair Tree Ginkgo biloba L 60' Oregon White Oak Quercusgarryana 0 L Pin Oak Quercus palustris AO Ir. L 65' Willow Oak Quercus phellos 0 0 41r1P L 6 ' iM Red Oak Quercus rubra L 65' Lacebark Elm Ulmus parvifolia thL aMa Grand Fir Abies grandis A L 100'+ Madrone Arbutus menziesii 0 air M 50' IIncense-Cedar Calocedrus decurrens A L 80' Atlas Cedar Cedrus atlantica A L 65' IDeodar Cedar Cedrus deodara A L 80' Port-Orford-Cedar Chamaecyparis lawsoniana L 75'+ `H inoki False Cypress Chamaecyparis obtusa 4 M 50' Southern Magnolia Magnolia grandiflora 'r , L 70' !Norway Spruce Picea abies A, L 100'+ Engelmann Spruce Picea engelmannii A. L 100' Colorado Spruce Picea pungens A. L 65' ■ Sitka Spruce Picea sitchensis L 120' 'Lacebark Pine Pinus bungeana L 50' Western White Pine Pinus monticola A. L 65' Er Austrian Pine Pinus nigra L 55' Ponderosa Pine Pinus ponderosa A, L 100'+ Japanese Black Pine Pinus thunbergiana 4 M 30' Zebrina Himalayan Pine Pinus wallinchiana 'Zebrina' 111M 30' Douglas-Fir Pseudotsuga menziesii 4 L 100'+ 1 8 List continues on Page 20 G-1.18 Full Sun• Part Sun, Part Shade• 4 =OK to plant under overhead utility lines Full Shade• 0 = Not OK to plant under overhead utility lines Mature Spread Soil Type Sun 4 Remarks 50' all A •• 0 Fall color,attracts wildlife,leaves may clog storm drains 40' all •• I 0 I Showy flower,bean-like fruit, no odor compared to other Catalpa species 45' ® Plant seedless varieties 30' all •• 0 Riparian species 40' * all •• 0 Plant seedless varieties 45' all •• 0 Many large stature varieties available,plant males to avoid stinky fruit 50' well drained • 0 Large native oak,western gray squirrel dependent on species for food source 30' all •• 0 Leaves hang on the tree in fall 45' all •• 0 Bronze or gold fall color, leaves hang on the tree in fall 40' all •• 0 Bronze, red,orange,and multicolored fall foliage 50' all •• 0 Interesting mottled bark 30' well drained •• 0 Susceptible to Balsam Wooly Adelgid (Adelges picene) 50' clay or loam ••• 0 Difficult to establish,striking bark,fragrant flowers 20' all •• 0 Drought tolerant I 40' all •• 0 Blue green needles,fragrant 40' all •• 0 Drought tolerant,attractive bark,weeping cultivar 'Pendula'available I 20' loam or sand •• 0 Can be used as a windbreak,highly susceptible to Port-Orford-Cedar root disease 20' all •• 0 Attractive bark,susceptible to spider mites all 60' all •• 0 Broadleaf evergreen, large fragrant white flowers 30' all •• 0 Good windbreak ■ 30' all •• 0 Susceptible to spruce budworm 20' all •• & Blue-green needles111 40' all •• 0 Needs ample water 30' all •• 0 Spreading nature,often with multiple trunks,attractive bark 20' all •• 0 Susceptible to white pine blister rust 40' all •• 0 Dark green needles 111= 30' all, moist • 0 Long needles,attracts wildlife 20' all • 0 Irregular shape . 9. 20' well drained • 0 Dwarf pine,slow growing 30' all • 0 Oregon's state tree "I • Round Oval A.Pyramidal !Vase Alirlit Umbrella # Columnar G-1.19 10' WIDE+ PLANTING SPACES - Continued Mature Mature COMMON NAME SPECIES NAME Shape Size Height EVERGREEN TREES 'Coast Redwood Sequoia sempervirens L 100'+ Giant Sequoia Sequoiadendron giganteum 4 L 100'+ 'Western Hemlock Tsuga heterophylla 4 L 100'+ Oregon Myrtle Umbellularia californica 'i ' L 65' NOTES cE 20 G-1.20 Full Sun• Part Sun, Part Shade• $ =OK to plant under overhead utility lines Full Shade• 0 = Not OK to plant under overhead utility lines Mature Spread Soil Type Sun # Remarks 40' all •• 0 Needs ample water, may reach 300'+in the wild 40' all • 0 Largest living organism on earth, long-lived 30' all ••• 0 Needs ample moisture 50' all ••• 0 Broadleaf evergreen,drought tolerant Round Oval A Pyramidal !Vase 11.1 Umbrella Columnar • 2I G-1.21 PROPER PLANTING AND CARE Proper planting and long-term care will help protect your investment in a new tree. Select a healthy specimen with good structure from the nursery and transport the tree cautiously. Ideally, new trees are planted in the fall after leaf drop or early spring before bud break. However, given adequate care, new trees can also be planted during the growing season. • Locate underground utilities before digging by calling (503) 246-6699. • Dig a hole about as deep as the root ball and about three times the width of the root ball. The wide planting hole will help promote root growth through the disturbed soil surrounding the root ball. The hole should not be so deep that the trunk flare is covered; the area where the roots spread at the base of the tree should be exposed. • Cut any circling roots prior to planting and only lift the tree by the root ball. • Adjust the tree straight-upright in the hole and backfill with good topsoil. Do not compact the soil, but gently pack to eliminate air and settle with water. Fertilizer should only be used if recommended based on soil testing results. • Staking may be needed to help the tree grow upright. Only install stakes if necessary and place them far enough from the tree that they don't stab the root ball. Remove stakes after one growing season to help the tree develop good, sound structure. • Apply 2 - 4 inches of mulch around the base of the tree, but not directly against the trunk. Mulch helps to retain moisture, moderate soil temperature, and minimize weed growth. • Keep the soil moist, but not saturated and do not apply water to the tree trunk. Water the minimum amount needed based on temperature and rain conditions. • Minor pruning may be needed if branches were damaged during planting or for improved structure or overhead clearance following establishment. Pruning should be performed by a qualified tree service. • Over time, observe changes to the tree and contact a consulting arborist for assistance if something seems out of the ordinary. 22 G-1.22 TREE PLANTING r • Remove all tags and labels gillk • Keep mulch layer away from tree trunk • Root flare above soil line ' tItiitiii.dI ,7 4 • Remove the container,any rope or wire,and as much of the burlap as possible if field grown. G-1.23 AVOIDING PROBLEMS Some tree species may not be desirable as street trees or in other particular locations due to messiness, insects, thorns, or the danger they pose from falling branches (weak wood), sidewalk buckling, or the tendency to topple over due to shallow roots. The trees listed below are prohibited as street trees in new development per the Lake Oswego Master Plant List (LOC 50.11.004). Acermacrophyllum- Big-leaf Maple- Leaves block drainage, roots buckle sidewalks Acer negundo- Box Elder- In sects,weak wood Acer rubrum- Red Maple- Shallow roots Acersaccharinum- Silver Maple- Shallow roots,weak wood Aesculus hippocastanum- Common Horse Chestnut- Messy fruit : , •-r l3etulusspecies- Birches- Insects,weak wood 1 . ''',', , .....\ 7 . 4r Carya species- Hickories- Fruit causes litter,safety 10 1 problems , -NC:4 s � '- -- Catalpa species- Catalpas- Seed pods cause litter problemsd . . . Corylus species- Filberts- Fruit causes litter,safety problems Crataegus species- Hawthorns-Thorns,fruit causes litter,safety problems Fraxinus species-Ashes- Seed pods cause litter problems Gleditsia triacanthos species- Honey Locust- Seeds cause litter problems Juglans species- Walnuts- Fruit causes litter problems i' !'ti, t ii''' +.;,•'`° Morus species- Mulberries- Fruit causes litter,safety problems ` A•._ ll ' . Populous species- Poplars- Shallow roots,weak wood r. Robinia species- Locusts- Weak wood,suckers Salix species- Willows- Shallow roots,weak wood 1 '4, ' e ;�'' w ] t'_.,31 1. '.'T F3. V' Ulmus fulva- Slippery Elm - Insects,shallow roots,weak wood w . Ulmus pumila- Siberian Elm - Shallow roots,weak wood 24 G-1.24 RESOURCES There are lots of resources available to help you find the right tree. Here are some ideas to get you started: • Visit friendsoftrees.org to see photos of each tree in different seasons, their leaves, fruit and bark, and an interactive illustration of the size and shape the tree will be at different stages of its life. • Search the internet using specific tree names to get photos and information. • Download an application for tree identification on your mobile device. • Walk around the neighborhood and find mature trees that appeal to you. • Use the library to find illustrated field guides to local trees. • Visit local nurseries to see trees and talk to the experts. • Consult with an arborist or landscape architect. , NOTES t r . vtlit r Jjjy y 3 . Revised 9/12 Botanical illustrations by Zelimir Borzan, University of Zagreb. Used with kind permission. Brochure design:wizmographics.com. 25 G-1.25 LAKE�SWEC.QtL Centennial 1910-2010 H4144;".:' A ''?!. d' CITY OF LAKE OSWEGO PLANNING & BUILDING SERVICES www.ci .oswego.or.us `. • Ph 503.635.0290 -, Fx 503.635.0269 • 380 A Avenue, 3rd Floor Post Office Box 369 Lake Oswego, OR 97034 otkik f 6 T+r1... ."A„_ G-1.26 ■ APPENDIX H APPROVED PLANT LISTS AND SEED MIXES City of Portland BES Stormwater Manual (2014) Plant List - H-1 City of Portland BES Stormwater Management Manual (2004) Seed Specifications - H-2 APPENDIX H- 1 APPROVED PLANT LISTS City of Portland BES Stormwater Manual (2014) Plant List Courtesy of City of Portland Environmental Services Used with permission APPENDIX F.4 PLANTING TEMPLATES AND PLANT LISTS Zone A: Area of the facility defined as the bottom of the facility to the designed high water mark. This area has moist to wet soils and plants located here shall be tolerant of mild inundation. Zone B: Area of the facility defined as the side slopes from the designed high water line up to the edge of the facility. This area typically has dryer to moist soils,with the moist soils being located further down the side slopes. Plants here should be drought tolerant and help stabilize the slopes. Swale Planting Zones Zone B Zone A Zone B Planter Planting Zones Zone A Basin Planting Zones Zone B Zone A C____Saturated Appendix F.4:Planting Templates and Plant List F.4-1 Portland Stormwater Management Manual-January 2014 Ecoroof Planting Zones A ZoneD 12 - 24" soil depth 4 - 12" soil depth Zone C r r Grassy Swale Native Seed Mix Percentages are by weight: Hordeum brachyantherum (Meadow Barley) = 25% Danthonia californica (California Oat-grass) = 15% Elymus glaucus (Blue Wild Rye) = 10% Bromus carinatus (California Brome) = 10% Festuca romerii(Roemer's fescue) = 10% Deschampsia cespitosa (Tufted hairgrass) = 10% Agrostis exarata (Spike bentgrass) = 10% Alopecurus geniculatus (Water foxtail) = 5% Deschampsia elongata (Slender hairgrass) = 5% Appendix F.4:Planting Templates and Plant List F.4-2 Portland Stormwater Management Manual-January 2014 Stormwater Management Facility Plant List Plant Name (Proposed Facility Type (Characteristics Private Public C, a c -0 73 > — U N (B L O o tct) V) Botanic name, Common a) c a .E Z �, a3 Name N c) � CO CO z Lu CL O Herbaceous Plants Aster suspicatus, Douglas' Aster B X X Y N 36" 12" Athyrium felix-femina, Lady Fern B X X X Y N 36" 24" Blechnum spicant, Deer Fern B X X X Y N 24" 24" Bromus carinatus, Califonia Brome Grass A X X Y Y 18" 12" Bromus sitchensis, Alaska Brome A X X Y Y 18" 12" Bromus vulgaris, Columbia Brome A X X Y Y 18" 12" Camassia leichtlinii, Camas Lily A X X X Y N 24" 12" Camassia quamash, Common Camas A/B X X X X Y N 24" 12" Carex deweyanna, Dewey Sedge A X X X X Y Y 36" 12" Carex densa, Dense Sedge A X X X X Y Y 24" 12" Carex obnupta, Slough Sedge A X X X X Y Y 4' 12" Carex rupestris, Curly Sedge A X X X N Y 14" 12" Carex stipata, Sawbeak Sedge A X X X N N 20" 12" Carex testacea, New Zealand Orange Sedge A X X X X N Y 24" 12" Carex vesicaria, Inflated Sedge A X X X X Y N 36" 12" Deschampsia cespitosa, Tufted Hair Grass NB X X X X Y N 36" 12" Eleocharis acicularis, Needle Spike Rush A X X X X Y Y 30" 12" Eleocharis ovata, Ovate Spike Rush A X X X X Y Y 30" 12" Eleocharis palustris, Creeping Spike Rush A X X Y Y 30" 12" Elymus glaucus, Blue Wild Rye B X X X Y Y 24" 12" Appendix F.4:Planting Templates and Plant List F.4-3 Portland Stormwater Management Manual-January 2014 Stormwater Management Facility Plant List Plant Name (Proposed Facility Type (Characteristics Private Public C) � c -0 a) I U N (B L73 (0 - V) Botanic name, Common a c a O N .E Z c5), a3 Name N u) u- CO CO z Lu CL O Herbaceous Plants (continued) Festuca occidentalis, Western Fescue Grass A X X X Y N 24" 12" Festuca rubra, Red Fescue B X X X Y Y 24" 12" Glycera occidentalis, Western Manna Grass A X X Y Y 18" 12" Hebe 'Autumn Glory', Hebe B X X N Y 14" 12" Iris douglasiana, Douglas Iris B X X X Y N 18" 12" Iris sibirica, Siberian Iris A X X X N N 36" 12" Iris tenax, Oregon Iris B X X X Y N 18" 12" Juncus balticus, Baltic Rush A X X X N N 20" 12" Juncus effusus var. pacificus, Soft rush A X X X X Y Y 36" 12" Juncus ensifolius, Dagger- leaf Rush A X X X X N N 10" 12" Juncus patens, Spreading Rush A X X X X N Y 36" 12" Juncus tenuis, Slender Rush A X X X X Y Y 36" 12" Lupinus micranthus, Small Flowered Lupine B X X X Y N 18" 12" Lupinus polyphyllus, Large- leaved Lupine NB X X Y N 36" 12" Polypodium glycrrhiza, Licorice Fern A X X X Y Y 12" 12" Polystichum munitum, Sword Fern NB X X X Y Y 24" 24" Pteridium aquilinum, Bracken Fern B X X Y Y 5' 12" Scriptus acutus, Hardstem Bulrush A X X X N N 10" 12" Scriptus americanus, American Bulrush A X X X X Y Y 30" 12" Scriptus mlcrocarpus, Small Fruited Bulrush A X X Y Y 24" 12" Scriptus validus, Softstem Bulrush A X X X N N 5' 12" Appendix F.4:Planting Templates and Plant List F.4-4 Portland Stormwater Management Manual-January 2014 Stormwater Management Facility Plant List Plant Name (Proposed Facility Type (Characteristics Private Public C) � c -0 73 > I 5 N (B L O N (0 - V) Botanic name, Common c a •v c5,, 50 Name N cn 0- co o 5 CO z w' CL o Herbaceous Plants (continued) Sedum oreganum, Oregon Stonecrop B X Y Y 4" 12" Sisyrinchium californicum, Yellow-eyed Grass A/B X X X N Y 6" 12" Veronica liwanensis, Speedwell A X X N N 2" 12" Large Shrubs and Small Trees Acer circinatum, Vine Maple A/B X X X X Y N 15' 10' Amelanchier alnifolia, Western Serviceberry B X X X Y N 20' 10' Ceanothus sanguineus, Oregon Redstem Ceanothus B X X X Y Y 7' 4' Holodiscus discolor, Oceanspray B X X X Y N 6' 4' Lonicera involucrata, Black Twinberry B X X X Y N 5' 4' Oemleria cerasiformis, Indian Plum B X X X Y N 6' 4' Philadelphu lewisii, Wild Mock Orange B X X X Y N 6' 4' Ribes sanguineum, Red- Flowering Current B X X X Y N 8' 4' Rubus parviflorus, Thimbleberry B X X X Y N 8' 4' Rubus spectabilis, Salmonberry A X X X X Y N 10' 4' Salix fluviatalis, Columbia Willow A/B X X X X N N 13' 6' Salix lucida var. 'Lasiandra', Pacific Willow A X X X X Y N 13' 6' Salix purpurea nana, Blue Arctic Willow B X X N N 8' 6' Salix stichensis, Sitka Willow A X X X X Y N 20' 6' Appendix F.4:Planting Templates and Plant List F.4-5 Portland Stormwater Management Manual-January 2014 Stormwater Management Facility Plant List Plant Name (Proposed Facility Type (Characteristics Private Public C) c -0 73 > I U N (B L O N a - V) Botanic name, Common a) > a Z �, c� Name N CO U- CO 5. CO Lu 0 O Large Shrubs and Small Trees (continued) Sambucus cerulea, Blue Elderberry B X X X Y N 10' 10' Sambucus racemosa, Red Elderberry B X X X Y N 10' 10' Spriaea douglasii, Douglas Spiraea NB X X X X Y N 7' 4' Viburnum edule, Highbush Cranberry A/B X X X X Y N 6' 4' Shrubs Ceanothus velutinus, Snowbrush B X X X Y Y 4' 3' Corpus sericea, Red-twig Dogwood A X X X X Y N 6' 4' Corpus sericea 'Kelseyii, Kelsey Dogwood B X X X N N 24" 24" Gaultheria shallon, Salal B X X X Y Y 24" 24" Mahonia aquifolium, Oregon Grape B X X X Y Y 5' 3' Mahonia nervosa, Dull Oregon Grape B X X X Y Y 24" 24" Physocarpus capitatus, Pacific Ninebark A/B X X X Y N 10' 3' Rosa gymnocarpa, Baldhip Rose B X X X Y N 3' 3' Rosa nutkana, Nootka Rose B X X X Y N 8' 3' Rosa pisocarpa, Swamp Rose NB X X X X Y N 8' 3' Symphoricarpos alba, Common Snowberry B X X X Y N 6' 3' Groundcovers Arctostaphylos uva-ursi, Kinnickinnick B X X Y Y 6" 12" Fragaria chiloensis, Coastal Strawberry B X X Y Y 6" 12" Appendix F.4:Planting Templates and Plant List F.4-6 Portland Stormwater Management Manual-January 2014 Stormwater Management Facility Plant List Plant Name (Proposed Facility Type (Characteristics Private Public C, c > c — U L c o N (0 V) Botanic name, Common c c a •v c5,, 50 Name N u) 0- co o 5 CO z w' CL o Groundcovers (continued) Fragaria vesca, Woodland Strawberry B X X N Y 10" 12" Fragaria virginiana, Wild Strawberry B X X N Y 10" 12" Helictotrichon sempervirens, Blue Oat Grass B X X N Y 24" 12" Mahonia repens Creeping Oregon Grape B X X Y Y 12" 12" Trees Abies grandis, Grand Fir B X X Y Y 150' Acer griseum, Paperbark Maple B X X N N 30' Acer macrophyllum, Big Leaf Maple B X X X Y Y 60' Alnus rubra, Red Alder A X X X Y N 80' Arbutus menziesii, Madrone B X X Y N 35' Crataegus douglasii, Black Hawthorn A X X X Y N 40' 10' Fraxinus latifolia, Oregon Ash A/B X X X Y N 30' Malus fusca, Pacific Crabapple A X X X X Y N 30' 10' Metasequoia glyptostroboides, Dawn Redwood B X X N N 80' Populus tremuloides, Quaking Aspen A X X Y N 40' Prunus emarginata var. mollis, Bitter Cherry NB X X X X Y N 50' Pseudotsuga menziesii, Douglas Fir B X X X Y Y 200' Quercus garryana, Oregon White Oak B X X X Y N 100' Appendix F.4:Planting Templates and Plant List F.4-7 Portland Stormwater Management Manual-January 2014 Stormwater Management Facility Plant List Plant Name (Proposed Facility Type (Characteristics Private Public C, a c -0 — U N O o N (0 - u) Botanic name, Common c c .7 a a Z c� Name N c) a CO o COCOu a z L O Trees (continued) Rhamnus purshiana, Cascara A/B X X X X Y N 30' Salix hookeriana, Hooker's Willow A/B X X X X Y N 15' Salix scouleriana, Scouler's Willow NB X X X X Y N 15' Thuja plicata, Western Red Cedar A X X Y Y 150' Tsuga hetrophylla, Western Hemlock A X X X Y Y 125' Tsuga mertensiana, Mountain Hemlock B X X X Y Y 125' Appendix F.4:Planting Templates and Plant List F.4-8 Portland Stormwater Management Manual-January 2014 Ecoroof Plant List Plant Name (Characteristics a) C a) C I .5 co a) — C V) Botanic name, Common C Z aa) () = Name N w'z a° 0 ui a Sedums and Succulents Delosperma ssp., Ice Plant C N Y 4" X Malephora crocea var. purpureo crocea 'Tequila Sunrise', Coppery Mesemb C N Y 10" X Sedum 'Autumn Joy' C N N 24" X Sedum acre, Biting Stonecrop C N Y 2" X Sedum album, White Stonecrop C N Y 3" X Sedum divergens, Pacific Stonecrop C N Y 3" X Sedum hispanicum, Spanish Stonecrop C N Y 3" X Sedum kamtschaticum, Kirin- so C N N 6" X Sedum oreganum, Oregon Stonecrop C Y Y 4" X X Sedum sexangular, Tasteless Stonecrop C N Y 4" X Sedum spathulifolium, Stonecrop C Y Y 4" X Sedum spurium, Two-row Stonecrop C N Y 6" X X Sempervivum tectorum, Hens and Chicks C N Y 6" X Herbaceous Plants Achillea millefolium, Common Yarrow C N N 36" X Achillea tomentosa, Wooly Yarrow C N N 8" X Arenaria montana, Sandwort C N N 4" X Artemesia 'Silver Mound', Artemesia C N N 12" X Aurinia saxatilis, 'Compacta' C N N 6" X Castilleja foliosa, Indian Paintbrush C Y N 10" X Appendix F.4:Planting Templates and Plant List F.4-9 Portland Stormwater Management Manual-January 2014 Ecoroof Plant List Plant Name (Characteristics 0) C a) a) C I .5 co ics � — U) C � Botanic name, Common C z aa) �j = Name N w'z a° 0 ui a Herbaceous Plants (continued) Dianthus ssp. C N N 12" X X Erigeron discoideus, Fleabane C N N 12" X X Festuca glauca, Blue Fescue C N Y 12" X X Fragaria chiloensis, Coastal Strawberry C Y Y 10" X X Fragaria virginiana, Wild Strawberry C Y Y 10" X X Gaillardia aristata, Birds-eye gilia C N N 20" X X Gazania linearis 'CO Gold', Gazania C N N 6" X Gilia capitata, Blue Thimble Flower C Y N 12" X Koelaria macrantha, June Grass C N N 24" X X Linaria reticulate, Purplenet Toadflax C N N 20" X Lobularia maritima, Sweet Alyssum C N N 12" X Polypodium glycrrhiza, Licorice Fern C Y Y 12" X X Polystichum munitum, Sword Fern C Y Y 24" X X Potentilla nepalensis, Nepal Cinquefoil C N N 14" X X Potentilla neumanniana, Cinquefoil C N N 14" X Thymus serphyllum, Creeping Thyme C N N 3" X Veronica liwanensis, Speedwell C N N 2" X X Shrubs and Small Trees Amalanchier alnifolia, Saskatoon Serviceberry D Y N 20' X Appendix F.4:Planting Templates and Plant List F.4-10 Portland Stormwater Management Manual-January 2014 Ecoroof Plant List Plant Name (Characteristics a) 0) C -a a) C 2 .5 e3 irs E s Botanic name, Common C z aa) j Name N w'Z O 0 ui a Shrubs and Small Trees (continued) Berberis thunbergii, Japanese Barberry D N N 4' X Gaultheria shallon, Salal D Y Y 24" X X Lavandula angustifolia 'Hidcote', Dwarf English Lavander D N Y 30" X Mahonia aquifolium, Oregon Grape D Y Y 5' X X Mahonia nervosa, Dull Oregon Grape D Y Y 24" X X Mahonia repens, Creeping Oregon Grape D Y Y 12" X X Nanadina domestica, Heavenly Bamboo D N N 4' X X Ribes sanguineum, Red- Flowering Current D Y N 12' X X Rosa nutkana, Nootka Rose D Y N 10' X Symphoricarpos mollis, Creeping Snowberry D Y N 18" X X Thymus vulgaris, Common Thyme D N Y 12" X X Appendix F.4:Planting Templates and Plant List F.4-11 Portland Stormwater Management Manual-January 2014 Greenstreets Plant List Facility Plant Name Type Characteristics Public ai c c o = a) .(7) 3 Botanic name, Common Name N v) v c �z w' ° O D Herbaceous Plants Carex densa, Dense Sedge A X X X Y Y 24" 12" Carex morrowii, Ice Dance A X X X N Y 24" 12" Carex obnupta, Slough Sedge A X X X Y Y 48" 12" Deschampsia cespitosa, Tufted Hair Grass NB XXX Y N 48" 12" Helictotrichon sempervirens, Blue Oat Grass B X X N Y 24" 12" Juncus patens, Spreading Rush A X X X N Y 36" 12" Shrubs Corpus sericea 'Kelseyii', Kelsey Dogwood NB X X X N N 24" 24" Euonymous japonicus 'Microphyllus' Boxleaf Evergreen B X X N Y 24" 24" Mahonia nervosa, Dull Oregon Grape B X X Y Y 24" 24" Spiraea betulifolia, Birchleaf Spiraea A/B XXX Y N 24" 24" Spiraea densiflora, Sub-alpine Spiraea NB X X X Y N 24" 24" Spiraea japonica, Japanese spirea cultivars: Dart's Red, 24"- „ Goldflame, Goldmound, Little NB X X X N N 36„ 24 Princess, Magic Carpet Groundcovers Arctostapylos uva-ursi, Kinnickinnick B X X Y Y 6" 12" Fragaria chiloensis, Coastal Strawberry B X X Y Y 6" 12" Appendix F.4:Planting Templates and Plant List F.4-12 Portland Stormwater Management Manual-January 2014 Greenstreets Plant List Facility Plant Name Type Characteristics Public ai c c o - c '- Cl) c I .5 3 co o Z a) CL a) a) � • u) a) Botanic name, Common Name ry v) v w E z ' CL O D Mahonia repens, Creeping Oregon Grape B X X Y Y 12" 12" Rubus calcynoides & A X X N Y 6" 12" pentalobus, Creeping Bramble Appendix F.4:Planting Templates and Plant List F.4-13 Portland Stormwater Management Manual-January 2014 Greenstreets Plant List Facility Plant Name Type Characteristics Public ai c c o = a) .(7) 3 Botanic name, Common Name N U) v c z w' rl° CS D Accent Plants Camassia leichtlinii, Great Camas A/B XXX Y N 24" 12" Camassia quamash, Common Camas A/B X X X Y N 24" 12" Iris douglasiana, Douglas Iris B X X Y N 18" 12" Iris tenax, Oregon Iris B X X Y N 18" 12" Street Trees Acer campestre ') velyn , Queen Elizabeth Hedge Maple A/B X X XNN 30' N Betula jacquemontii, Jacquemontii Birch A/B X X XNN 60' N Celtis occidentalis, Hackberry A/B X X X N N 50' N Koelreuteria paniculata, Goldenrain Tree A/B X X XNN 30' Y Nyssa sylvatica, Black Tupelo A X X XNN 50' N Prunus virginiana 'Canada Red', Canada Red Chokecherry A/B X X XNN 25' Y Quercus shumardii, Shumard Oak NB X X XNN 70' N Rhamnus purshiana, Cascara A/B XXX Y N 30' Y Appendix F.4:Planting Templates and Plant List F.4-14 Portland Stormwater Management Manual-January 2014 Pond Plant List Planting Plant Name Zone Characteristics a) L c CO 0 C > C = _ a cv O o_ ca ) (To n Botanic name, Common = Z Name 2 o z w o O Herbaceous Plants Alisma plantago-aquatica, Water Plantain X Y N 24" 12" Alopecurus geniculatus, Water Foxtail X Y Y 18" 12" Aster suspicatus, Douglas' Aster X X Y N 36" 12" Bidens cernua, Nodding Beggerticks X Y N 24" 12" Blechnum spicant, Deer Fern X X Y N 24" 24" Bromus sitchensis, Alaska Brome X X Y Y 18" 12" Camassia quamash, Common Camas X Y N 24" 12" Carex deweyanna, Dewey Sedge X X Y Y 36" 12" Carex obnupta, Slough Sedge X Y Y 4' 12" Deschampsia cespitosa, Tufted Hair Grass X Y N 36" 12" Eleocharis ovata, Ovate Spike Rush X Y Y 30" 12" Eleocharis palustris, Creeping Spike Rush X Y Y 30" 12" Elymus glaucus, Blue Wild Rye X Y Y 24" 12" Glycera occidentalis, Western Manna Grass X X Y Y 18" 12" Lemna minor, Common Lesser Duckweed X Juncus effusus var. pacificus, Soft rush X X Y Y 36" 12" Juncus ensitonus, uagger- leaf Rush X X Y Y 24" 12" Appendix F.4:Planting Templates and Plant List F.4-15 Portland Stormwater Management Manual-January 2014 Pond Plant List Planting Plant Name Zone Characteristics V a) L co 0 c > c = _ O o_ ca (To n Botanic name, Common = Z Name > '2 o z wa O Herbaceous Plants (continued) Juncus oxymeris, Pointed Rush X X Y Y 24" 12" Juncus patens, Spreading Rush X X N Y 36" 12" Juncus tenuis, Slender Rush X X Y Y 36" 12" Lupinus polyphyllus, Large- leaved Lupine X Y N 36" 12" Myosotis laxa, Small-flowered Forget-Me-Not X Y N 18" 12" Polystichum munitum, Sword Fern X X Y Y 24" 24" Sagittaria latifolia, Wapato X Y N 24" 12" Potamogeton natans, Floating leafed Pondweed X Y Y 18" 12" Scriptus acutus, Hardstem Bulrush X N N 10" 12" Scriptus mlcrocarpus, Small Fruited Bulrush X Y Y 24" 12" Sisyrinchium idahoense Blue- eyed Grass X N Y 6" 12" Sparganium emersum, Narrowleaf Bur-reed X Y N 24" 12" Veronica liwanensis, Speedwell X X N N 2" 12" Viola palustris, Marsh Violet X X Y N 6" 6" Large Shrubs and Small Trees Acer circinatum, Vine Maple X X Y N 15' 10' Amelanchier alnifolia, Western Serviceberry X Y N 20' 10' Holodiscus discolor, Oceanspray X Y N 6' 4' Lonicera involucrata, Black Twinberry X Y N 5' 4' Appendix F.4:Planting Templates and Plant List F.4-16 Portland Stormwater Management Manual-January 2014 Pond Plant List Planting Plant Name Zone Characteristics V a) L a, 0 c > c = _ ) To cv O o_ ca (n Botanic name, Common = Z Name 2 o z w' a O Large Shrubs and Small Trees (continued) Oemleria cerasiformis, Indian Plum X X Y N 6' 4' Philadelphu lewisii, Wild Mock Orange X Y N 6' 4' Ribes sanguineum, Red- Flowering Current X Y N 8' 4' Rubus parviflorus, Thimbleberry X Y N 8' 4' Rubus spectabilis, Salmonberry X X Y N 10' 4' Salix fluviatalis, Columbia Willow X X N N 13' 6' Salix lucida var. 'Lasiandra', Pacific Willow X X Y N 13' 6' Salix stichensis, Sitka Willow X X Y N 20' 6' Sambucus racemosa, Red Elderberry X Y N 10' 10' Spriaea douglasii, Douglas Spiraea X Y N 7' 4' Viburnum edule, Highbush Cranberry X Y N 6' 4' Shrubs Corpus sericea, Red-twig Dogwood X X Y N 6' 4' Fragaria vesca, Woodland Strawberry X X NY 10" 12" Fragaria virginiana, Wild Strawberry X X NY 10" 12" Mahonia aquifolium, Oregon Grape X X Y Y 5' 3' Mahonia nervosa, Dull Oregon Grape X Y Y 24" 24" Appendix F.4:Planting Templates and Plant List F.4-17 Portland Stormwater Management Manual-January 2014 Pond Plant List Planting Plant Name Zone Characteristics V a) L co 0 c > c = _ a cv O o_ ca ) (To n Botanic name, Common = Z 'Name 5 2 a z w o O Shrubs (continued) Physocarpus capitatus, Pacific Ninebark X Y N 6' 3' Rosa gymnocarpa, Baldhip Rose X Y N 3' 3' Rosa nutkana, Nootka Rose X Y N 8' 3' Rosa pisocarpa, Swamp Rose X Y N 8' 3' Spiraea betulifolia, Birchleaf Spiraea X Y N 24" 24" Symphoricarpus alba, Snowberry X Y N 3' 3' Trees Abies grandis, Grand Fir X Y Y 150' Acer macrophyllum, Big Leaf Maple X Y Y 60' Alnus rubra, Red Alder X X Y N 80' Arbutus menziesii, Madrone X Y N 35' Corpus nuttalii, Western flowering Dogwood X X Y N 20' Crataegus douglasii, Black Hawthorn X Y N 40' Fraxinus latifolia, Oregon Ash X X Y N 30' Malus fusca, Pacific Crabapple X X Y N 30' Pinus ponderosa, Ponderosa Pine X Y Y 70' Pinus monticola, Western White Pine X X Y Y 90' Prunus emarginata var. mollis, Bitter Cherry X Y N 50' Pseudotsuga menziesii, Douglas Fir X Y Y 200' Appendix F.4:Planting Templates and Plant List F.4-18 Portland Stormwater Management Manual-January 2014 Pond Plant List Planting Plant Name Zone Characteristics V a) L co 0 c > c — O ca (n - D Botanic name, Common = z 'Name 5 2 o z w ° O a Trees (continued) Quercus garryana, Oregon White Oak X Y N 100' Rhamnus purshiana, Cascara X Y N 30' Salix hookeriana, Hooker's Willow X X Y N 15' Salix scouleriana, Scouler's Willow X X Y N 15' Thuja plicata, Western Red Cedar X X Y Y 150' Appendix F.4:Planting Templates and Plant List F.4-19 Portland Stormwater Management Manual-January 2014 APPENDIX H-2 APPROVED SEED MIXES City of Portland BES Stormwater Management Manual (2004) Seed Specifications SEED SPECIFICATIONS FOR STORMWATER MANAGEMENT MANUAL Species listed below should only be used In the listed moisture regime for optimal success, Sow rates for mall seeded mixes Mali contain a minimum of 20 lbs./per acre in combination for stormwater management facilities and 301bslacre for erosion control purposea Sow rates for largelmedium seeded mixes should contain a minimum of 25 lbs per acre in mom ili Pat lco for stormWater management facilities and 40 poutldsper acre for erosion control purposes Matrix cr to Swale or lma Optimal Sow add Sow Rate Ercaim apiroi'stw Column name Scientific Flame Seasm diversttq? [Hans] Rate Moisture Eoppstre Seed see Cpmmercial accessittrityol.local eco•typx Grasses Amedcen.S Dug hgrass Beckm anni a syxigadlne fall/spring b 2 lbslac NR inundatecelo wet sun medium easy to m odium,Allltamette Valley Bluepuldrye Ben us ghumus early toll rinn M 25 Ibs.iac 401estacre xelcto mesic sunk o shade lamp east Portland Metro Cal torn'a brome Bromus carinatus early tellJspring M 25 Ibsen 401bslaae soreto mesic sub largo easy ortland Metro California oatgrass Ranthonia celifomica fall/spring M 30 Ibsen NC• sun large easy to m Odium,Wiliam the Valley . Columbia.brome Bromus Cubans falllsyyring D 5 lbslac NR xeric to mesic shade large medium.P ortland Metro JUnegrass Koeleria macrardha fallrpring M 20 nonfat NR xeric to mesic sun small easy tom odium P DX orWulamette Valley Meadowtarley Hordeum brachyadtheru early-fall/Spring M 20 Ibsuac 4011ma:re wetto mesic sun igrue easy to medi OM,Willam Otte'Valley Pine bluegrass Poa secunda Rice cutgrass Leersia ortcnides fall/sprlhg D 5 lbslac NR inundated-10 net sun medium medium to difficlt P ortland Metro Roemer's fescue Festuca roemeri fall/spring D 2lbslao NR fenc to mesic sun small difficult,Wiliam ette Valley Sitka brome Bromus sltchensts early talilspring M 25 Ibsen 40 Ids/acre Yogi to mesic sine-shade large ee sy,Wiliam the Valley • Slender ha irrary4ass D.,esdra1n�psta elongeta. early-Fall/spring M 20 Ibsen 30 lbsraore +net to xerlc sun small eassyy,P ortland Metre Slender vdteatgrass E(ym ustrachyiotu(ues early-fan/Spring M 25 novae 401bs/acre neck to mesic sun large meduum to difficult,Willamette Valley Spike bentglass Agrostis exarata early-fallspOing D 5 lbslac 301bs/acre saturated to suet sun small easy tom edi um,Portland Metro Tall mannpgras5 Glycena elata fall/spring D 2 lbslac NR Saturated to mesic shade small m ecfum to diffiol�lt P ortlandiM etre Toted hairgraes Desdrampsia cesppitoss fall/spring b 2 lbslac NR saturated to wet sun small easy,Willamette Valley Water fo#ai1 Nopecuris genrculatus fall/spring M 251bstes NR in undat edio wet sun medium easy,P DH or Willamette Valley Western fescue Festuca occidentalis fall/spring M 20 Ibsen NR xencto mesic sun small m edium to difficult Willamette Valley • Western m annagrass Glyceria occider�talis fall/spring M 25 Ibsuac NC ucturated to Mel. son medu m i easy tom edi um,Willam ette Valley Sedges Rxsires•soit moisture as indicated into summer months Carex obnupta Slough sedge fall/spring D 2lbslac NR inundated to m esic sunlshade medium m Odium to difficult,P DX Carexoco aria Pointed broom sedge fall/p ring D 2 lbslac NR Met to mesic sun medium m edium to difficult/P DX • Cares sti a Sayre eak sedge fat l/spring D 2 Ibsbac NR inundetedio mesic sun medium medium Willam ette Valle! Eleocilarls Ovate Ovate spikerooll faliispring D 1 lblac rip inundatedlo sect sun Small easy,P D'X or Willamette Valley Bleacher's palustris Creepirpgs(fl kerush fall/spring D 2 lbslac NR inundetedio wet sun small easy ton/odium,Willamette'Valley Mails acuminatus Tapertip rta fall/spring D 0.251bslac ftR inundatedto not sun small m ecru m,Willam ette Valley,P D X Juncos bufonius Toad rush fall/spring D 0.251bslac NR Met to mesic sun small m Odium,Willam the Valley duncus patens 'Spreading rush fall/spring 0 0.501biac NR Met to mesic sunlshade small easy,PM Forts Achilles millefoloum Western Yarrow fail 0 0,251hslao NC usetto mesic sun medium easy PD X or Willamette Valley Aqudlegia Formosa Western Celue dine fall b 1.01blec NR Wet to mesic sun medium easy to m eel um,Willamette Valley Wilma media Water plantain tali/spring [S 1.01b/ac NR inundated.io Wet sun medium easy to medi um,Willam Otte Valley Colnmia grairdiO4ra Large tlovrered col lomia falilsorsp D .50 lbslac NR Sene to mesic sun small medium to difficult Willamette Valle,/ Cvlilnee rattanii Blue eyed m ary falilspring D .25 lbslac NR edc to mesic sun small m edlum to dillicft,Willa mete Valley Epilottium densifiora Dense spike primrose fall D 1.0!Wm NR Met to mesic sun small medium,Willam ette Valley Eriophytlum lanatum Wooly sunshine tall D 1.0 lblac NR Met to mesic sun medium easy to medium Willamette Valley 011ie capitols Blue gilia fall/spring 0 2 lbs/acre 1'Vac pm :Slim to mesic sun medium medium,Willam elite Valley Lotus pupshianus Spanish laver fall D 2 Ids/acre 1 Iblaclvof sonic to mesic sun medium m edlum,Willam the Valley Luptnus albicaul is Sickle keel lupine fall 0 1 lblac 1 Iblac`Nd Se ric to mesic sun large m odium.Willam elite Valley Instenax Oregon Iris fall D 2 lbslacu NR xeric to mesic sun large easy to medium Willamete Valley Camassia quam ash Comm on camas fall D 1 lblac NR ysetto mesic sun medium easy to m edi um,Willam ette Valley Camassia quam ash vuGreat camas fall b 1!Vac 'NR settle mesic sun medium easyto medium,Vvillam ette Valley Lupinus micfamhus Small flowered lupine fall D 1 idiom NR• xeucto mesic sun medium medium to difficult//Willa mete Valley Ranunculus occidental Western buttercup fall D 1 Vac NR xerictn mesic sun medium medium to difficltt,Willamette Valley Sidalcea cam pestris. Checker mallow fall D 1 lbrac NR xertc to mesic sun large m edlum to difficult,Willamette Valley Ls�pAinus rivularis Stream lytpine fall 0 1 lblac 1 bloc OM neck to mesic sun tame medium Willam the Valley PlagiobothrysilguratuAl'opoorn fluter fall/spring LI 1.0 lb/ac NR lnundat edit'ad awn small medIumio dtlb)colt,Willa mette Valley Prunella Mtlgarisvar(i Self heal fall/spring D 2 lbslac 1 lblac lxi' ysetto mesic sunshade medium easy tom Odium,P DX erWilla mete Valley Selidag0 canadenOis Goldenrod fall b 0.501bslac NR ;rule tomesic sun small easy to mecum,P DX orWillametteValley Recommended A°on•Native Cover Crop Species Festura rub re Var.corttChewngs fescue year round. M 20lbsac 30-4 pie Tritrcum spp Wheat year round M 5011:nrac 5i4 n/a Avena spp. Oats year round M do lbslac KS nla Regreeh Sterile WY eat hybrid year round M 4-01bsrac 50 PM Agropyrun spp. Wheatgrass year round M 30 lbsuace 40 A,trachycaulua.M.V.source) AWisance Grass Species not mcommended!erase on Erasion Control or Stonnwater Projec ik Species Comnioc name State Lisle I Noxious Weed? ▪ropyron repens Quads grass yes(B-list) Nuissncen Portland Plant List P lopecuris VatenSiss Meadow(oxtail no Nuisance List Portland Plant List Ardhoxanthum ogoraiuSvteet vem al grass no Nuisance List Portland Plant List Arrhenatherum el ati us Tall'oatgrasS no Nuisance List Portland Plant Lis Brechyp odium syl vat is False brume yes(Clint)- Nuisance List Portland Plant List Brdmusdiandrus Ripgul no •Nuisance List Portland Plant List Bremushoni ace us Smooth brume no Nuisance List Portland Plant List Bremusinermis Smooth brume no Nuisance Lisi Portland Plant List Ei emusiu1�yyonicus Japanese brome no Nuisance List Portland Plant List Brnmussterlis Poverty grass no Nuisance List Portland Plant List Brumustecturum Cheatgrass no Nuisance List Portland Plant List Festuca arundinacea Tall fescue no Nuisance List Portland Plant List Hocks!anetus Val yet grass no Nuisance List Portland Plant List Lolium multlOorum Annual negrass no Nuisance List Portland Plant List Phalaria.arundirracee Reed canary drays no Nuisance List Portland Plant List Phalaris anuatice Harlini grass no Nuisance List Portland Plant List Phleum pratensis Timothy no Nuisance List Portland Plant List Phregmrtes austral is Comm on reed no Nuisance List Portland Plant List Vulpia mvoros Rat-tailed-fescue no Nuisance List Portland Plant List , Stormwater Management Manual Page F-14 Adopted July 1, 1999, revised September 2004 H-2.1 APPENDIX! EROSION PREVENTION AND SEDIMENT CONTROL PLAN INFORMATION Erosion Prevention and Sediment Control General Notes - I-1 Erosion Prevention and Sediment Control Application - 1-2 Erosion Prevention and Sediment Control Permit Attachment - 1-3 APPENDIX! - 1 EROSION PREVENTION AND SEDIMENT CONTROL PLAN INFORMATION Erosion Prevention and Sediment Control General Notes 1-1.0 di ell os CITY OF LAKE OSWEGO Building Permit No. Q AP rrin) Erosion Prevention and Sediment Control valor General Notes Address \ ••E G O„ --- See the Erosion Prevention and Sediment Control Planning and Design Manual for requirements. ❑ Cover stockpiles with plastic sheeting during wet weather season. From October 1st through May 31st„the wet weather erosion prevention measures are in effect. During the wet weather season, all stockpiles shall be covered with plastic sheeting and protected with perimeter control at the toe of slope. Cover/stabilize stockpiles in summer season when unworked for 14-days, or immediately upon inspection of wind erosion. ❑ Protect exposed soils with an adequate ground cover during wet weather season. Mulch, straw, compost, wood chips, and plastic sheeting are examples of acceptable ground cover. Temporarily cover exposed soils at the end of each day during wet weather season. Stabilize exposed soils in summer season and protect from wind erosion. ❑ Provide leak-proof pans for concrete rinse water and mortar and masonry materials. Concrete wash-out,tile saw, and mortar slurry must be contained in leak-proof pans and properly disposed of. No ground or"pit" dumping allowed. ❑ Provide adequate,well-marked garbage containers. Garbage and debris, including litter,food wrappers, construction scraps, and material packaging must be collected and contained in secured garbage containers. ❑ Install stabilized clean rock construction entrance. Construction entrance shall be installed at the beginning of the project and maintained throughout the project. Single family residential construction entrance to be minimum 20' length, 1%z" diameter clean rock, 8" depth. Commercial or development construction entrance to be minimum 50' length, 4"—6" diameter clean rock, 8" depth. ❑ Maintain clean and sediment free construction entrance (including the existing driveway). Do not rinse or power wash sediment onto the street or into storm inlets. Dry sweep/vacuum sweep any tracking on street surfaces at the end of each work day. ❑ Provide storm drain inlet protection. All catch basins and area drains that have the potential to receive runoff from the construction site must be protected until pavement surfacing is completed or site is stabilized. ❑ Clean all catch basins and conveyance lines prior to paving. The cleaning operations shall not flush sediment- laden water into the storm water drainage system. ❑ Install temporary paved or graveled area for construction parking. Do not block the construction entrance with trailers or material storage. Restore areas utilized for temporary parking to pre-construction conditions, or better. ❑ Provide plywood or steel sheeting construction pathways. Load and unload materials on the jobsite, not in the street. Even small "bobcat" style equipment can cause soil disturbance. Install wood or steel sheeting on construction pathways to minimize soil disturbance and damage to existing root systems. ❑ Designate location to store and stage construction materials. Storage locations should be constructed on gravel, plywood, pavement, or another hard surface. Compost, bark-dust,topsoil, or other amendments should be stored on tarps. Phase material delivery to provide adequate and safe workspace for construction crew. ❑ Provide a spill kit on site.A spill kit is required to prevent hazardous or harmful substances from entering the ground or surface waters after a spill. Crews must be trained on the location and use of the kit. ❑ Mark the boundaries of the clearing limits in the field prior to construction. Construction limits shown on the plan shall be clearly flagged in the field prior to construction. Land disturbance is not allowed beyond flagging. GENERAL NOTES CONTINUED ON REVERSE 1-1.1 Erosion Prevention and Sediment Control General Notes (continued) ❑ Owner or designated person shall be responsible for proper installation and maintenance of all erosion and sediment control measures. Designee shall maintain compliance with water quality requirements in accordance with LOC Chapter 52, State, and Federal regulations. ❑ Implementation of the Erosion and Sediment Control (ESC) plan, maintenance, replacement, and upgrading of ESC measures is the responsibility of the General Contractor until all construction is completed,the site has been stabilized, and approved by the City Manager or his designee. ❑ All erosion control measures shall comply with specifications provided in the "Erosion Prevention and Sediment Control Planning and Design Manual" (Revised December 2008), available at htto://www.clackamas.us/wes/designmanual.html ❑ ESC measures shown on this plan must be installed prior to any clearing or grading activities. Installation shall be completed in such a manner as to ensure that sediment and sediment laden water does not enter the storm water drainage system, roadways, or violate applicable water quality standards. ❑ ESC measures shown on the plan are minimum requirements for anticipated site conditions. As construction progresses, erosion control measures shall be updated to ensure that sediment and sediment-laden water does not leave the construction site. ❑ During active construction, ESC measures shall be inspected daily by an Erosion Control Plan Manager(specifically designated by the owner or contractor). ESC measures are to be maintained as necessary to ensure their continued effectiveness. During inactive periods, the ESC measures shall be inspected every 2 weeks or within 24 hours following a rain event of%z" or greater. ❑ Stay familiar with current erosion prevention and sediment control requirements. Owner and General Contractor are responsible for knowing and following local, state, and federal requirements. Most local regulations are mandated by the Federal Clean Water Act; the city does not have authority to waive these requirements. ❑ Protect existing vegetation and limit soil disturbance. Stabilize exposed soils as quickly as possible. Consider the use of deep-rooted native vegetation to stabilize exposed soils. ❑ Locate the nearest storm drain inlets. Protect inlets with non-woven filter inserts. Properly dispose of any material that accumulates in the filter. Remove all filters upon permanent site stabilization. ❑ Do not rinse any material into the storm drain. Remember: "Only rain goes down the drain!" ❑ All dewatering discharges will be treated using a discharge inline filter in addition to inlet protection. Unfiltered dewatering discharge cannot be disposed of in the storm system. ❑ Public streets will be swept daily, if necessary, to minimize sediment discharged into the storm water drainage system. Unfiltered wash water cannot be discharged to the storm system. 1-1.2 APPENDIX 1-2 EROSION PREVENTION AND SEDIMENT CONTROL PLAN INFORMATION Erosion Prevention and Sediment Control Application 1-2.0 zc v' E os\ CITY OF LAKE OSWEGO Building Permit No. ( ;4 I 2 Ok 1 V AIM�� D Erosion Prevention and Sediment Control Demo/Other Permit No. Permit Application °RE.Ga�' Payment of erosion control permit fee is required before building permit can be issued SITE LOCATION Construction site address GENERAL CONTRACTOR Name Address Company Phone I Email OWNER/APPLICANT Name Address Company Phone I Email 24-HOUR EMERGENCY CONTACT Name Address Company Phone I Email SITE INFORMATION Lot size(SF) Area of land disturbance (SF) Approximate start date Approximate end date Soil disposal (onsite/off site) Location of soil disposal and estimated quantity(if off-site) Waterfront property(Y/N) Name(if yes) Estimated quantity(CY) Project Description (including construction phasing, if applicable) REQUIRED Check all that apply ❑ Demolition ❑ New Single Family Residential ❑ Commercial/Industrial ❑ Other • Erosion control measures MUST BE IN PLACE prior to any construction activity. Complete checklist on reverse and provide signature. All items within the checklist must be clearly identified on the erosion control plan sheet. Applications with a partial checklist or without signature will be considered incomplete and returned to the owner/applicant. Lake Oswego erosion and sediment control details can be found at: http://www.ci.oswego.or.us/standard-details Clackamas County erosion and sediment control details can at: http://www.clackamas.us/wes/designmanual.html Erosion control questions can be directed to the City Erosion Control Inspector at 503-675-3991. I-2.1 EROSION PREVENTION AND SEDIMENT CONTROL PLAN CHECK LIST EROSION PREVENTION AND SEDIMENT CONTROL PLAN REQUIREMENTS Y N/A Minimum 11"x 17" size paper with all text size 1/8" in height, or larger ❑ Property boundary, North arrow, Bar scale ❑ Existing and proposed contours, labeled at no greater than 5' intervals ❑ Existing and proposed structures ❑ (Structures include,but not limited to:house,shed,garage,pool,spa,patio,sport court,gazebo,retaining wall,boat dock,etc.) Site access/equipment access ❑ Construction site boundary, and any surface waters(lake,canal,stream,wetland,etc.) ❑ Limits of soil disturbance ❑ Construction entrance (Single family residential construction entrance to be minimum 20'length,1'/,"diameter(min)clean rock,8"depth) ❑ (Commercial or development construction entrance to be minimum 50'length,4"—6"diameter clean rock,8"depth) Staging/material storage area(s) ❑ Soil stockpile(s) (appropriately scaled on drawing) ❑ ❑ Existing vegetation to remain ❑ ❑ Temporary ground cover(mulch,straw,wood chips,rock,plastic sheeting,etc.) ❑ Perimeter erosion control (straw wattles,silt fence,sediment basin,berms,silt curtain,etc.) ❑ Internal erosion control (erosion control matting,sediment basins,temporary seeding,etc.) ❑ ❑ Storm drain inlet protection ❑ ❑ Leak proof concrete wash-out pans and leak proof garbage containers ❑ Stormwater facilities and surface water features (rain garden,flow through planter,dry well,etc.) ❑ ❑ (All stormwater facilities must be adequately protected from compaction/construction traffic.) Construction vehicle parking(provide clean rock to unimproved parking areas) ❑ ❑ Notes/narrative indicating how exposed soils will be permanently stabilized ❑ Notes/narrative stating that routine inspections of erosion control structures will occur and that ❑ maintenance or replacement of failed structures will occur when necessary Notes/narrative stating erosion control inspections are required before grading/clearing begins, and ❑ before footings are placed Details and notes necessary for proper installation and maintenance of all erosion and sediment control ❑ structures "The permit or approval granted hereby,or any inspections conducted on the site hereafter,shall not be construed as authorizing any activity in violation of any applicable federal or state law or regulation, including but not limited to the federal Endangered Species Act and its regulations." Owner/Applicant Signature Date H:\Erosion Control Program\a_Projects_forms_details\EC_docs_memos_current\doc\2015-04-14_EC application.doc Revised 04/2015 1-2.2 Appendix 1-3 EROSION PREVENTION AND SEDIMENT CONTROL PLAN INFORMATION Erosion Prevention and Sediment Control Permit Attachment 1-3.0 (01p-P4CITY OF LAKE OSWEGO Building Permit No. 1� valoro Erosion Prevention and Sediment Control Permit Attachment Address REGO„ Erosion control measures MUST BE IN PLACE prior to any land disturbing activities. The owner/applicant/permitee agrees to comply with the Water Environmental Services "Erosion Prevention and Sediment Control Planning and Design Manual"(revised December 2008) and all local, state and federal water quality requirements. The owner/applicant/permitee agrees to properly install and maintain all measures indicated on the approved plan and attachments. Additionally,the site address must be clearly visible from the street. "The permit or approval granted hereby, or any inspections conducted on the site hereafter, shall not be construed as authorizing any activity in violation of any applicable federal or state law or regulation, including but not limited to the federal Endangered Species Act and its regulations." REQUIRED EROSION CONTROL INSPECTIONS 6010—Initial Erosion Control Inspection • Must be scheduled prior to any work beginning on-site • All erosion control measures must be in place, per plan, prior to inspection 6030—Pre-footings Erosion Control Inspection • Must be scheduled before any concrete footings are poured • A concrete wash-out pan must be on-site and ready for use at time of inspection • All erosion control structures must be functioning and installed per plan • NOTE: a building department structural inspection cannot be scheduled without an approved erosion control pre-footings inspection 6050—Final Erosion Control Inspection • Must be scheduled upon completion of all permanent landscaping • The site must be stable and all erosion control structures removed To schedule erosion control inspections, reference your IVR number listed on the erosion control permit and call 1-888-299-2821, or online at www.buildingpermits.oregon.gov. WET WEATHER REQUIREMENTS From October 1st through May 315t,the wet weather erosion prevention measures are effect for any exposed soils or soils not fully established. See the Erosion Prevention and Sediment Control Planning and Design Manual(Chapter 4)for requirements. All stockpiled sediment, when not in use, will be covered with plastic sheeting and isolated with silt fencing or check dam at the toe of slope. All exposed soils will be protected with an adequate ground cover at the end of the day. (Straw, mulch, compost, wood chips, plastic sheeting are examples of adequate ground cover. Consult the detail sheet in the permit or the manual for specifications. COMMON EROSION AND SEDIMENT CONTROL DETAILS ARE ON REVERSE (See http://www.ci.oswego.or.us/standard-details for all City details.) 1-3.1 Notes: Dimensions Single Family: Catch basin grate 20'Long By 20'Wide 8"Deep Of 1 "minus clean rock. / -1"Rebar fpr bag removal Other Dev��j miegl; stes: So'long By 20'wide Catch basin P 4"clean rock, Expansion restraint Governing authority may require / 2"X 2"x u/ geotextile fabric to prevent d _ _ -- <" sub-soli pumping. �e�`ti a\�� Say Storm pipe --—' Rubber blocks Q • 20e ess P °° h''n.* • .. `5i.�PC ad °,°o ° 0 t� [oJ o °ooa ° 0 ° - tee 5QQ r,oo°„°°c°o °p o o -Poly proplene filter back o'5°°°°ooa°°"o°�°o o t, - (woven) 0 ca n" o n„n n,�°" WOVEN POLYPROPLENE SACK c°ooa o °° o ° f� Radius=25'min.Jl Y-/� et°yad\o, egs _,�. ces - Catch basin grate Subgrade./IN.... ......... a ea Catch basin `___ - geotextile,as required 8" min. __--- Polyproplene boot depth .20'min.For single family and duplex - residential Storm pip _-_-------Ovs ow e Gravel construction entrance Curb ramp Polyproplene filter / sack(non-woven) Pavement r.' ,1v NON-WOVEN POLYPROPLEME SACI( .A O °C o oD O :::,,:so o°o O. °C ALo CURE., Note: 1)Recessed curb inlet catch basins must be blocked when using filter fabric inlet sacks.Size of filter fabric inlet sacks to be determined by manufacturer. l'auo cc NON-WOVEN CATCH w6' DB 5 �wtl'' 'p�/ IIJi�>iyv City rf xk O-ztu �' cc s. City of Oswego MP,: CONSTRUCTION ENTRANCE Lh +" ty 8 BASIN INSERT INLET �� Ene �, i D 1S9" Bn n , ]e m�KBK �view� � � PROTECTION 0 f. . DEKVancntmmrx El-08 F~h, m t Scale,2/2N.T1/ i9k h T)e�c-1f/��04 1�:�1e����l"_: iz V E1-02 Dete 12/21f49 pd nw�a• e &I° p ▪ DIill. rdi v 1 `o ni t hV ''° ,Q 2t �inry L N n = ,,a i w R R - O p N iO 9 0_ _ Z ru N 2 lo1'0_ i`f w Z° .7 `� pp O ry y m d N pL't a 0 C ^r -a ... L .J 6 6= f__L_ N 2 ry _F Q. n -'x v ]f ■ ooa y ▪ o S °n A " .A. `Minimum 12"overlap of seams nil n.c m F vi y..N 2 Plastic sheeting / °` _N y a y`_ - ' /`/ 7li I -- mu oc c C 72 Sandbag II m' '"'I lJ=a a ' e 111I^,rnl en iii a�in a ���V IP 11—li= 4-▪ ; V1 e e.a Stock pile • 111111 e o (13 i ... Rope iNzji _ M o Ground n. �Y $Y I 1a :+ $ Y u a - r N "N }o a5� a AMR' 4. 7,a • f Barrier required at toe of slope a m 5 = 1 ire u x 3 Notes: m 1)Minimum 12"overlap of all seams required. °''° • . V $g 2)Barrier required at toe of stock pile. .L • 7 - 3)Covering maintained tightly in place by using . L 8 a sandbags or tires on ropes with a maximum 10'grid Y „.1 ;; spacing in all directions. 1. ,, S N N - y I I 1 eit C1Lakc Oswego lle:.i� pf keel fT'" 'ilir CiN'vS1dkC Oswego SEDIMENT FEND k' -SOOa 0 „n PLASTIC SHEETING cY R� te Ensinocrin Diriv,nn c:hv.,•. DC LT, k ku ((�t . LS`aF�^=�,° onLcvmGrimmra. E1-10 n"m fy000L Tsoa n. ,raa.r:DKaita nrxxrxira:unFx� E1-04 e1;r:rioe IS..ar,.e,...,,w:i 1-3.2 APPENDIX . SOURCE CONTROL J Source Control Note: Content from this chapter was adapted from Seattle Director's Rules(Seattle Public Utilities 2009a). Overview Water quality treatment BMPs described in Chapter 4 remove pollutants after they have entered stormwater. They are typically more expensive and often cannot remove 100 percent of the pollutants. The City's MS4 permit requires that the City prevent illicit discharges and reduce pollutants from industrial and commercial facilities. The use of source control BMPs is the first line of defense in stormwater pollution prevention for several reasons, including: • In most cases, source control BMPs are sufficient to correct stormwater pollution problems. • Most source control BMPs are relatively inexpensive and easy to implement. The source control BMPs included in this chapter include both required BMPs to comply with the City stormwater code and the City's MS4 permit, and recommended BMPs. Source control BMPs prevents contaminants from entering stormwater runoff and the surface water utility by controlling them at their source. Source control BMPs are options that prevent or reduce stormwater contamination with or without the aid of permanent structures. They can include process changes, such as changes in raw material and products, and the recycling of wastes. Many source control BMPs are common sense housekeeping practices; for example, dust and debris can be swept or vacuumed from a work area and put into the garbage instead of being washed with a hose into a storm drain or other drainage conveyance. Examples of source control BMPs include: • Implementing good housekeeping practices • Implementing preventive maintenance procedures • Writing and implementing a spill plan (SWPPP or procedural BMPs) • Covering materials • Isolating pollutant sources to prevent uncontaminated stormwater from flowing onto those areas and becoming a source of contamination • Moving pollution-generating activities inside or under a covered area • Using a berm or deflector curb to keep contaminated water from entering the surface water management system • Erecting a permanent roof or structure over storage and working areas • Installing a wash pad that is connected to the sanitary sewer Table D.1 lists source control activities that can be used by residents, all types of commercial businesses, institutions, and land uses in Lake Oswego. J-1.1 0co v > v a) r 0_ a) 0 a) -0 0 -0 W W 0.) I- 3 -0 D ni O a) a 0 Cl)Q a ov o o v * Q = Do o — a Q_ o — m vvv va tz . = < . _ asv0CD 4 ov v vmy � 0 o u m< n C) m •=. n . �cov � < mv - •gm � 33 < oo � - ao m � � cn m c� n = -a cm o cQ N c 0 v 0 Cl) v 0 °o < Q o 2 cD -� CD 0 o m m cn v - Cl) 5. Q m 0 • • • • • Eliminate illicit connections to storm drains ow 0 • • • • • Perform routine maintenance for drainageCD systems and stormwater facilities 0 0 0 • • • • Dust control o Cl) • • • • • • • • • Proper storage of solid wastes su 0 • • • • • • • • • • Proper disposal of fluids and wastes c0 u) • • • • • • • • • • Spill prevention and cleanup N • • • • Landscaping, lawn and vegetation management Painting, finishing, and coating of vehicles, • • • boats, buildings, and equipment • • • • • Parking lot maintenance and storage of vehicles and equipment • • • • • Fueling at dedicated stations • • • • • Vehicle repair and maintenance • • Swimming pool and spa maintenance • • • • • Vehicle, equipment, and building washing • • • Outdoor storage or transfer of solid raw materials, byproducts, or finished products Eliminate Illicit Connections to Storm Drains Some properties and residences have internal building drains, sump overflows, process wastewater discharges, and even sanitary sewer and septic system pipes that are incorrectly plumbed to the Lake Oswego surface water management system. These storm drain connections allow a variety of pollutants to flow directly to the surface water ultimately receiving drainage instead of to the sanitary sewer or septic system. Frequently, such connections are not intentional, but they can be very harmful to the environment and must be eliminated. All building owners or managers in Lake Oswego should examine their plumbing systems to identify any illicit connections.A good place to start is an examination of the site plans. If any toilets, sinks, appliances, showers, bathtubs, floor drains, industrial process waters, or other water-using equipment are connected to the Lake Oswego surface water management system, those connections must either be permanently plugged or disconnected, and rerouted as soon as possible. If it is not obvious through observation or examination of site plans, one method of determining where a pipe or structure drains is to perform a dye test with a nontoxic dye or a smoke test. These tests are typically best performed by qualified personnel such as a plumbing contractor. If it is found that sanitary facilities, such as toilets and sinks, are hooked up to the Lake Oswego surface water management system, a connection permit must be obtained from the City Building Department to reroute them to the sanitary sewer. Other options for correcting discharges to the drainage system include using a holding tank or installing a process treatment system. Restrictions on certain types of discharges may require pretreatment before they enter the sanitary sewer. It is the responsibility of the property owner or business operator to obtain the necessary permits and to follow through on rerouting the connection from the storm drain to the sanitary sewer. Contact the City of Lake Oswego Engineering Division if you suspect a cross-connection. Perform Routine Maintenance for Surface Water Management System Sediment and pollutants can accumulate over time in various components of drainage collection, conveyance, and treatment systems, such as catch basins, ditches, storm drains, and oil/water separators. These pollutants can include sediment and other substances such as oils, debris, and sludge. When a storm event occurs, the pollutants can become mobilized and carried into the surface water ultimately receiving drainage water. Regular maintenance of the drainage system decreases the amount of pollutants available to contaminate the stormwater. See Section 7.1.4 for a description of routine maintenance activities. Dust Control This BMP applies to residents, businesses, and public agencies that pursue dust control measures in disturbed land areas or on unpaved roadways and parking lots. All land-disturbing activity must comply with the City's erosion control code (LOC Chapter 52). Dust can result in air and water pollution, particularly at demolition sites, in disturbed land areas, and on unpaved roadways and parking lots. Chemicals applied to dust-prone areas to minimize dust production can also pollute stormwater and the surface water ultimately receiving drainage water if they are not properly selected or applied. J-1.3 General Recommendations Minimize dust generation and apply environmentally friendly and government- approved dust suppressant chemicals, if necessary. The use of motor oil or other oils for dust control on unpaved roadways and parking lots is prohibited. Required Best Management Practices The following BMPs or equivalent measures are required of all businesses and public agencies engaged in activities that generate dust: • Street gutters, sidewalks, driveways, and other paved surfaces in the immediate area of the demolition must be swept regularly to collect and properly dispose of loose debris and garbage. • Install catch basin filters on site and in surrounding catch basins to collect sediment and debris. Maintain the filters regularly (weekly or as needed) to prevent plugging. Remove catch basin filters when development activity is complete. • The use of oil for dust control is prohibited. Proper Storage of Solid Wastes This BMP applies to properties that store solid wastes, including food wastes and ordinary garbage, outdoors. If improperly stored in this climate, these wastes can contribute a variety of pollutants to stormwater. Pollutants of concern include toxic organic compounds; fats, oils, and greases; metals; nutrients; suspended solids; substances that increase chemical oxygen demand; and substances that increase biological oxygen demand. These pollutants must not be discharged to the drainage system or directly into receiving waters. Dangerous solid wastes must be stored and handled according to special guidelines and may require a permit. Businesses and public agencies that store dangerous wastes must follow specific regulations outlined by DEQ. For the specific requirements and permitting information, contact DEQ. General Recommendations Store wastes in suitable containers with leak-proof lids. Sweep or shovel loose solids. Educate employees about the need to check for and replace leaking containers. Consider implementing the following practices: • Store containers such that wind will not be able to knock them over. • Use waterproof liners to prevent leaks from the solid waste container. • Designate a storage area, pave the area, and slope the drainage to a holding tank or sanitary sewer drain. If a holding tank is used for storing wastewater, the contents must be pumped out before the tank is full and disposed of appropriately to a sanitary sewer or wastewater treatment system. • Compost appropriate wastes or recycle solid wastes. J-1.4 Required Best Management Practices The following BMPs or equivalent measures are required of all properties engaged in the storage of solid wastes: • Store solid wastes in suitable containers with leak-proof lids. Containers must be replaced if they are leaking, corroding, or otherwise deteriorating. • The waste storage area must be swept or otherwise cleaned frequently to collect all loose solids for proper disposal in a storage container. Do not hose the area to collect or clean solids. • Drain dumpsters, dumpster pads, and trash compactors to the sanitary sewer. • Use spill cleanup materials to clean up fats, oil, grease, or other contaminants. Proper Disposal of Fluids and Wastes This BMP applies to all residents, businesses, property owners, and public agencies engaged in pressure washing of non-vehicular engines, equipment, and portable objects. It also applies to businesses that clean or wash manufacturing equipment, such as saws, grinders, screens, and other processing devices, outside of buildings. General Recommendations To contain fluids and wastes generated from these activities, use of a wash pad is highly recommended. Sumps or holding tanks may be useful for storing liquid wastes temporarily. The contents must be disposed of properly. Solid and liquid wastes and contaminated stormwater must be disposed of using one of the following acceptable methods: • Recycling facilities • Municipal solid waste disposal facilities • Hazardous waste treatment, storage, and disposal facilities • Sanitary sewer Required Best Management Practices The following BMPs or equivalent measures are required of all businesses engaged in cleaning or washing of tools, engines, equipment, and portable objects: • All wash water must be discharged to a sanitary sewer, process treatment system, or holding tank and must never be discharged to the surface water management utility. If a holding tank is used for the storage of wash water, the contents must be pumped out before the tank is full and disposed of appropriately to a sanitary sewer or wastewater treatment system (pretreatment and/or permit requirements may apply). • Pressure washing must be conducted in a designated area (such as a wash pad) that is provided with a sump drain connected to a sanitary sewer or treatment system, or a blind sump or holding tank. The wash area must have a means for stormwater run-on prevention (such as a berm or sump). • For wash pads that discharge directly to the sanitary sewer, the uncovered portion of the wash pad must be no larger than 200 square feet or must have an overhanging roof. This is to prevent excess stormwater from entering the sanitary sewer. J-1.5 A connection permit is needed to connect to the City's sanitary sewer system. For information about connection permits, call the City Building Department. Many liquid wastes and contaminated stormwater (depending on the pollutants and associated concentrations) can be discharged to the sanitary sewer system, but they are subject to approval and permitting by the wastewater treatment plant. Please contact the Lake Oswego Engineering Division for more details. If wastes cannot be legally discharged to a sanitary sewer, dangerous and hazardous wastes must be properly transported to an appropriate hazardous waste disposal, treatment, and storage facility. Spill Prevention and Cleanup Spills can contribute a variety of pollutants to the drainage system and nearby waterways and are often preventable if appropriate practices for chemical and waste handling and spill response are implemented. Promptly contain and clean up leaks and spills of solid and liquid pollutants including oils, solvents, fuels, and dust from operations on any exposed soil, vegetation, or paved area. The specific requirements for complying with this citywide BMP are described below. A spill can be a one-time event, a continuous leak, or frequent small spills. All types must be addressed. General Recommendations To reduce the potential for spills, implement the following practices and have spill cleanup kits available at activity locations where spills may occur: • Clearly label all containers that contain potential pollutants. • Store and transport liquid materials in appropriate containers with tight- fitting lids. • Place drip pans underneath all containers, fittings, and valves where materials are likely to spill or leak. • Use tarpaulins, ground cloths, or drip pans in areas where materials are mixed, carried, and applied to capture any spilled materials. • Train employees on the safe techniques for handling materials used on the site and encourage them to check for leaks and spills. Required Best Management Practices All businesses identified in Table J.1 and any other businesses or institutions that store or use chemicals shall meet the requirements identified in this section. Spill Plan Develop and implement a spill plan (spill prevention and control plan) and update it annually or whenever there is a change in activities or staff responsible for spill cleanup. Post a written summary of the plan at appropriate points in the building, such as loading docks, product storage areas, waste storage areas, and near a phone. The spill plan may be required to be posted at multiple locations. • Describe the facility including the owner's name, address, and telephone number; the nature of the facility activity; and the general types of chemicals used in the facility. • Designate spill response employees to be on the site during business activities. Provide a current list of the names, addresses, and telephone numbers (office and home) of designated 1.6 spill response employee(s) who are responsible for implementing the spill plan. • Provide a site plan showing the locations of storage areas for chemicals, storm drains, and other relevant drainage or materials information. • Describe the emergency cleanup and disposal procedures. • List the names and telephone numbers of public agencies to contact in the event of a spill. • All employees must have annual training of spill control procedures. New employees must be trained upon hiring.All training must be documented. For templates and guidance on preparing spill control plans, refer to the following resources: The City operates the Watershed Hotline(503-675-3982), a call number for citizens to report http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index. watershed concerns, illicit cfm?action=factsheet_results&view=specific&bmp=62&minmeasure=4 discharges, or spill activity.This hotline is advertised on the http://www.deq.state.or.us/wq/wgpermit/docs/ City's website and periodically general/12001ndSWPCPChecklist.pdf in the City's monthly newsletter "Hello LO." During normal business hours,the City's http://www.epa.gov/emergencies/docs/oil/spcc/tier1template.pdf Engineering staff answer this phone line and respond to non-emergency calls within Spill Cleanup Kit one business day. Emergency calls taken during normal Store spill cleanup kits near areas with a high potential for spills so that office hours are redirected to they are easily accessible in the event of a spill. The contents of the spill the City of Lake Oswego Fire kit must be appropriate to the types and quantities of materials stored or Department.All calls reporting a OM otherwise used at the facility and refilled when the materials are used. (503-635-0238spil are forwarded- L to LO ego - Lake Oswego Contents may include, for example: non-emergency number)for Fire • Absorbent pads Department dispatch, and all calls are initially responded to as • Sorbent booms, or socks a"Level 1 Emergency." • Absorbent granular material such as kitty litter • Protective clothing such as latex gloves and safety goggles • Thick plastic garbage bags • Drain cover Spill Cleanup and Proper Disposal of Material In the event of a spill, implement the following procedures: • Implement the spill plan immediately. • Contact the employee(s) responsible for implementing the spill plan. • Block off and seal the nearby inlet(s) to the drainage system to prevent materials from entering the drainage system. • Use an appropriate material to clean up spills. Do not use emulsifiers or dispersants such as liquid detergents or degreasers. • Immediately report to the City all spills that could reach storm drains, the sanitary sewer, streams, rivers, or Oswego Lake. J-1.7 • Do not wash absorbent material into interior floor drains or exterior storm drains. • Dispose of used spill control materials in accordance with the hazardous waste management guidance on DEQ's website http://www.deq.state.or.us/lq/hw/index.htm and applicable laws. Landscaping, Lawn, and Vegetation Management This BMP applies to businesses and public agencies that perform landscaping including grading, landscape materials storage piles, soil transfer, vegetation removal, pesticide and fertilizer applications, and watering. Lawn and vegetation management can include control of objectionable weeds, insects, mold, bacteria, and other pests by means of chemical pesticides and is conducted commercially at commercial, industrial, and residential sites. Examples of landscaping and lawn and vegetation management include weed control on golf courses, access roads, and utility corridors; removal of moss from rooftops; killing of nuisance rodents; application of fungicides on patio decks; and residential lawn and plant care. Stormwater contaminants from landscaping, lawn, and vegetation management activities include toxic organic compounds, metals, oils, suspended solids, pH adjusters, coliform bacteria, fertilizers, and pesticides. Pesticides such as pentachlorophenol, carbonates, and organometallics can be released to the environment as a result of leaching and dripping from treated plants, container leaks, product misuse, and outside storage of pesticide-contaminated materials and equipment. Inappropriate management of vegetation and improper application of pesticides or fertilizers can result in stormwater contamination. These pollutants must not be discharged to the drainage system or directly into receiving waters, except as permitted by DEQ. Pesticides are prohibited for use in stormwater facilities. General Recommendations Avoid fertilizer application, soil erosion, and site debris. Cover and contain exposed, erodible soils. Develop and implement an integrated pest management (IPM) plan (see Appendix A for example) to address pest and disease issues. For an investigation district map with contact information, refer to this website: http://www.oregon.gov/ ODA/PEST/docs/pdf/invdist.pdf To control erosion and the discharge of stormwater pollutants, maintain appropriate vegetation, properly apply fertilizer where necessary, and consider the use of pest-resistant varieties when possible. Also, grow plant species appropriate for the site. Required Best Management Practices The following BMPs or equivalent measures are required of all businesses and public agencies engaged in landscaping or lawn and vegetation management activities. To report violations or ask questions about pesticide use, contact the Oregon Department of Agriculture. Landscaping • Do not dispose of collected vegetation in the surface water management system, waterways, receiving waters, or sensitive lands or protected areas. Take care to avoid contamination or site disturbance. J-1.8 • Use mulch or other erosion control measures when soils are exposed for more than one week during the dry season (June 1 to September 30) or more than two days during the rainy season (October 1 to May 31). Pesticides • Develop an IPM plan that, at a minimum, includes the requirements outlined in Appendix A, Integrated Pest Management Plan Example. • Choose the least toxic pesticide that is capable of reducing the infestation to acceptable levels. • Conduct any pest control during the life stage when the pest is most vulnerable. For example, if it is necessary to use a Bacillus thuringiensis (Bt) application to control tent caterpillars, it must be applied before the caterpillars form their cocoons or it will be ineffective. The pest control method should be site-specific rather than generic. • When necessary to use pesticides, apply according to the directions on the label and use the following BMPs: • Conduct spray applications according to specific label directions and the applicable local and state regulations. Some applications may require a pesticide applicator's license. Please see http://www.oregon.gov/ODA/PEST/Pages/licensing_index.aspx • Do not apply pesticides if it is raining or immediately before expected rain (unless the label directs such timing). • Ensure that the pesticide application equipment is capable of immediate shutoff in the event of an emergency. • Do not apply pesticides within 100 feet of open waters including wetlands, ponds, streams, sloughs, or any drainage ditch or channel that leads to open water except when approved by DEQ and the City. All sensitive areas including wells, streams, and wetlands must be flagged prior to spraying. Take care to avoid contamination or site disturbance during applications. • Never apply pesticides in quantities that exceed the manufacturer's instructions. • Mix pesticides and clean the application equipment under cover in an area where accidental spills will not enter surface water or ground water and will not contaminate the soil. The City's Sensitive Lands ordinance also restricts certain described pesticide use within buffer zones of certain sensitive areas. Please contact the City Planning Department for more information on designated sensitive lands. Storage: • Store pesticides in enclosed areas or in covered impervious containment. • Do not hose down the paved areas to a storm drain, street, or other conveyance. • Ensure that pesticide-contaminated waste materials are kept in designated covered and contained areas, and disposed of properly. • Rinsate from equipment cleaning and/or triple-rinsing of pesticide containers should be used as product or recycled into product. Do not pour rinsate down the drain! J-1.9 Fertilizer • Ensure that all fertilizers are applied by properly trained personnel to areas requiring fertilizer (not driveways, pathways, or stormwater facilities). • Document and keep all training records. • For commercial and industrial facilities, ensure that fertilizers are not applied to grass swales, filter strips, or buffer areas that drain to sensitive receiving waters. Painting, Finishing, and Coating of Vehicles, Boats, Buildings, and Equipment This BMP applies to businesses and public agencies that perform outdoor surface preparation and application of paints, finishes, and coatings to vehicles, boats, buildings, and equipment. Potential pollutants include organic compounds, oils and greases, heavy metals (including copper, lead and zinc), and suspended solids. These pollutants must not be discharged to the surface water management system or directly into any receiving waters. General Recommendations Cover and contain exterior surface preparation, painting, and sanding operations and apply good housekeeping and preventive maintenance practices to prevent the contamination of stormwater with paint overspray and grit from sanding. Conduct activities indoors whenever possible. The following BMPs are recommended to further prevent and minimize the contamination of stormwater resulting from activities related to the painting, finishing, and coating of vehicles, boats, buildings, and equipment: • Recycle paints, paint thinner, solvents, wash water from pressure washers, and any other recyclable materials. • Use efficient spray equipment such as electrostatic, air-atomized, high-volume/low-pressure, or gravity-feed spray equipment. • Purchase recycled paints, paint thinner, solvents, and other products if feasible. Unused paint may be recycled at the Metro Recycling and Paint Disposal • Dispose of unused paint promptly. Facility: http://www.oregonmetro.goy/index.cfm/ go/by.web/id/571 Required Best Management Practices The following BMPs or equivalent measures are required of all businesses and public agencies engaged in activities related to the painting, finishing, and coating of vehicles, boats, buildings, and equipment. Preparation and Application • Train employees in the application and cleanup of paints, finishes, and coatings to reduce misuse and overspraying. Document and keep all training records. • Use ground cloths or drop cloths underneath outdoor painting, scraping, and sandblasting work, and properly clean and temporarily store collected debris. Porous drop cloths are recommended for exterior surface preparation work to capture solids and allow rainwater to seep through. J-1.10 • Use a storm drain cover, catch basin filter, or similarly effective runoff control device if dust, sediment, or other pollutants may escape the work area. If a catch basin filter is used on site, maintain the filter regularly (weekly, or as needed) to prevent plugging. • Do not conduct spraying, blasting, or sanding activities over open water or where wind may blow paint into water. If windy conditions are present, use a curtain to contain the activity. • While using a spray gun or conducting sand blasting, enclose and/or contain all work in compliance with applicable air pollution control requirements and those of the Occupational Safety and Health Administration (OSHA). Cleanup • Wipe up spills with rags and other absorbent materials immediately. Do not hose down the area. • On marine dock areas, sweep rather than hose down debris. Collect any water that is generated and convey it to an appropriate treatment and disposal facility. • Use a ground cloth, pail, drum, drip pan, tarpaulin, or other protective device for activities such as paint mixing and tool cleaning outside or where spills can contaminate stormwater. Whenever possible, conduct these activities inside or in an enclosed area. • Clean paint brushes and tools covered with water-based paints in sinks connected to sanitary sewers or in portable Unused paint may be recycled acontainers that can be dumped sanitary ed into a seer drain. tpo l Fa Recycling and Paint D Disposaal Facility: • Collect solvents used to clean brushes and tools covered http://www.oregonmetro.gov/index. with non-water-based paints, finishes, or other materials. cfm/go/by.web/id/571 Used solvents (e.g., paint thinner, turpentine, and xylol) must be recycled or be disposed of properly. Material Storage and Disposal • Dispose of all wastes and prevent all uncontrolled releases to the air, ground, and water. • Store all paints, finishes, or solvents inside a building or in covered secondary containment. • All containers must have tight-fitting lids. Parking Lot Maintenance and Storage of Vehicles and Equipment This BMP applies to businesses and public agencies that own or operate public and commercial parking lots and sidewalks, such as those associated with retail stores, apartment buildings, fleet vehicles (including car rental lots and car dealerships), and equipment sale and rental facilities. It also includes properties where vehicles or equipment are stored outside. Potential pollutants produced by the parking and storage of vehicles and equipment include petroleum hydrocarbons and other organic compounds, oils and greases, metals, and suspended solids. General Recommendations Prevent stormwater contamination by avoiding and reducing washing. Do not use soap or other chemicals unless the area drains to a sanitary sewer. When wash water is discharged to the sanitary sewer, check if pretreatment is necessary before being discharged. Some sites may be required to obtain a wash water permit from DEQ. For example, the washing of roads, parking lots, sidewalks, and other paved surfaces is permitted provided: Lake Oswego Stormwater Manual J-1.11 • Surfaces are swept prior to washing, and • There is no runoff off the site or discharge to surface waters, storm sewers, or dry wells. Please see provisions of DEQ 1700B permit at http://www.deq.state.or.us/wq/wgpermit/genpermits.htm and or contact DEQ's Northwest Region Permit Office for more details. Required Best Management Practices The following BMPs or equivalent measures are required for activities related to the parking and storage of vehicles and equipment: • Sweep or vacuum parking lots, storage areas, sidewalks, and driveways regularly to collect dirt, waste, and debris and dispose of as solid waste. • Do not hose down or pressure wash areas that drain to a storm drain, drywell, or to the surface water ultimately receiving drainage water. • If a parking lot must be washed, discharge the wash water to a sanitary sewer or other approved wastewater treatment system, if allowed by the City, or collect it for offsite disposal. Please contact the City for more information. • Cover or plug storm drains to prevent wash water from entering the surface water management utility. • In some cases, contaminated stormwater may need to be pretreated before it is discharged to the sanitary sewer. • Make sure all outside materials that have the potential to leach or spill to the drainage system are covered, contained, or moved to an indoor location. • An oil removal system is recommended for high-use parking lots. Fueling at Dedicated Stations This BMP applies to businesses and public agencies that operate a facility used exclusively for the transfer of fuels from a stationary pumping station to vehicles or equipment. This type of fueling station includes aboveground or underground fuel storage facilities, which may be permanent or temporary. Permanent fueling stations include facilities such as, but not limited to, commercial gasoline stations, 24-hour convenience stores, car washes, warehouses, manufacturing establishments, maintenance yards, marinas and boatyards, and private fleet fueling stations. Temporary fueling stations include facilities such as, but not limited to, construction sites and any other site on which fuel is temporarily stored and dispensed into vehicles or equipment. A spill can be a one-time event, a continuous leak, or frequent small spills. All kinds must be prevented. Typically, stormwater contamination at fueling stations is caused by leaks or spills of fuels, lubrication oils, radiator coolants, and vehicle wash water. These materials contain organic compounds, oils and greases, and metals that can be harmful to humans and aquatic life. These pollutants must not be discharged to the surface water management system or directly into receiving waters. Direct or indirect discharges of antifreeze, oil, gasoline, grease, and all other automotive and petroleum products and flammable or explosive materials into the surface water management system are prohibited discharges under the City's stormwater code (LOC Chapter 38). These types of discharges are also prohibited by state regulations. J-1.12 General Recommendations All new fueling stations must be constructed on an impervious concrete pad under a roof to keep out rainfall and to prevent stormwater runon. A treatment BMP must be used for contaminated stormwater and wastewaters in the fueling containment area. Vehicle Repair and Maintenance This BMP applies to businesses and public agencies on whose premises oil, fuel, engine oil, and other fluids such as battery acid, coolants, and transmission and brake fluids are removed and replaced in vehicles and equipment. It also applies to mobile vehicle maintenance operations, such as those at construction sites. A spill can be a one-time event, a continuous leak, or frequent small spills. All kinds must be prevented. Pollutants of concern are toxic petroleum hydrocarbons, toxic organic compounds, oils and greases, pH, and metals. These pollutants must not be discharged to the surface water management system or directly into receiving waters. General Recommendations Leaks and spills of fluids can be prevented and contained by the use of good housekeeping measures and the use of cover and containment BMPs. Compliance can be achieved more easily with sewer and stormwater requirements by running a "dry shop," thereby reducing consumption and discharge of liquids. Soiled rags and other cleanup material must be properly managed in accordance with Lake Oswego Fire Code and Solid Waste regulations or cleaned and reused by a professional cleaning service. Leaks and spills of fluids can be prevented and contained by the use of good housekeeping measures and the use of cover and containment BMPs. Compliance can be achieved more easily with sewer and stormwater requirements by running a "dry shop," thereby reducing consumption and discharge of liquids. Soiled rags and other cleanup material must be properly managed in accordance with Lake Oswego Fire Code and Solid Waste regulations or cleaned and reused by a professional cleaning service. Although not required, the following BMPs can provide additional pollution protection: • Recycle oil, antifreeze, batteries, and air conditioning coolant. Recover air conditioningUnused paint may be recycled at the • gases. Metro Recycling and Paint Disposal Facility: • Use reusable cloth rags to clean up drips and small spills instead of disposable materials. http://www.oregonmetro.gov/index.cfm/ go/by.web/id/571 • Use absorbent pillows or booms in or around storm drains and catch basins to absorb oil and fuel. Required Best Management Practices The following BMPs or equivalent measures are required of all businesses and public agencies engaged in vehicle repair and maintenance activities: • Employees must be educated annually about the need for careful handling of automotive fluids. New employees must be trained upon hiring. Employees at businesses or public agencies that routinely change or handle these fluids must be trained in spill prevention and cleanup.All training must be documented. For information on training, see http://www.ecobiz.org/pdf/Keep-Shop.pdf J-1.13 • Spill cleanup materials, such as rags and absorbent materials, must always be kept close at hand when changing oil and other fluids. Soiled rags and other cleanup material must be properly disposed of or professionally cleaned and reused. • Maintenance and repair activities must be conducted indoors. • Drain all fluids that have the potential to leak from wrecked vehicles and equipment when they arrive. Store and dispose of fluids properly. • If the work must be performed outdoors or at a mobile location (such as a construction site), drip pans or other containment devices must be used beneath the vehicle or equipment to capture all spills. • Make sure all outside materials that have the potential to leach or spill to the drainage system are covered, contained, or moved to an indoor location. • Maintenance and repair areas cannot be hosed down. Instead, they must be swept weekly or more often as needed to collect dirt, and spills must be wiped up with rags and other absorbent materials. If pressure washing is necessary, the wastewater must be collected and disposed of properly. It cannot be discharged to the stormwater drainage system. • Drains located inside buildings must be connected to the sanitary sewer. • Do not allow drains inside maintenance buildings to connect to the sanitary sewer without prior approval from the City.A connection permit is needed to connect to the City's wastewater system. For information about connection permits, call the City Building Department. In most cases, stormwater collected on fuel containment pads will need to be pretreated before it is discharged to the sanitary sewer. • If floatable components are present, use an oil/water separator or other appropriate treatment to treat all runoff from the fluid changing area prior to discharge to the sanitary sewer. Swimming Pool and Spa Maintenance This BMP applies to all private, public and commercial swimming pools and spas. Pools and spas at hotels, motels, apartments, and condominium complexes are also covered. Pollutants of concern include nutrients, suspended solids, chlorine, pH adjusters, and substances that increase chemical oxygen demand. General Recommendations Dispose of pool or spa water to the sanitary sewer, if approved by the City. Although not required, the following BMP can further help to reduce the potential for stormwater contamination: • Hire a professional pool-draining service to collect all pool water for offsite disposal. Required Best Management Practices The following BMPs or equivalent measures are required for all swimming pool and spa cleaning and maintenance activities. • In some cases, contaminated washwater from swimming pool and spa cleaning and maintenance activities may need to be pretreated before it is discharged to the sanitary sewer. For approval before discharging wash water to the wastewater system, contact Public Works Operations (503-635-0282) at least 48 hours in advance. J-1.14 • Pool water may not be discharged to a receiving water or the surface water management system unless there are no detectable levels of chlorine because, even at low concentrations, chlorine is harmful to fish and other aquatic life. If pool discharge water is discharged to the ground, discharge must be slow enough to allow infiltration of all water into the ground and not produce surface runoff. • Diatomaceous earth used in pool filters cannot be discharged to receiving waters, drainage systems, septic systems, or the ground. Vehicle, Equipment, and Building Washing This BMP applies to the washing of vehicles, aircraft, vessels, The City has charity car wash kits industrial equipment, and large buildings. Discharges resulting from available at no cost to reduce the impacts of carwash fundraisers. See scrubbing, sanding, pressure washing, and steam cleaning are the City's website for more information also included in this category of cleaning and washing activities. (www.rai ntoriver.org). General Recommendations Vehicle washing by private citizens and fund-raising groups such as schools, churches, and scouting groups is permitted. However, fund-raising groups must employ the best management practices outlined in DEQ's fact sheet on non-profit activities: http://www.deq.state.or.us/wq/wqpermit/docs/general/wpcfl 700b/permit.pdf http://www.deq.state.or.us/wq/pubs/bmps/washactsnoprft.htm Wash water from cleaning activities can contain soaps and detergents, oils and greases, suspended solids, metals, and soluble organic compounds that can contaminate stormwater. These pollutants must not be discharged to the drainage system or directly into receiving waters. Although not required, the following BMPs can provide additional pollution control for businesses and public agencies that perform washing operations for vehicles, equipment, and building structures. To reduce potential overall pollution load to the sanitary sewer: • Minimize water and detergent use in all washing operations. • Use phosphate-free detergents when practical. • Consider recycling the washwater by installing a closed-loop water recycling system. For intermittent uses, such as at commercial parking lots and gasoline stations used for charity car washes where it is not possible to discharge the wash water to an indoor sanitary connection (such as to an indoor toilet or utility sink), a temporary plug or a temporary sump pump can be used at the storm drain to collect the wash water for offsite disposal, such as discharge to a nearby sanitary sewer. • At industrial sites, contact DEQ for NPDES permit requirements related to washing trucks. • Car dealerships may wash vehicles in the parking stalls if either a temporary plug system is used to collect the wash water for disposal, as stated above or an approved treatment system for the wash water is in place. J-1.15 Required Best Management Practices Cleaning, pressure washing, and steam cleaning wastewater must be discharged into a sanitary sewer drain at a site that is approved for discharge. It is illegal to discharge the dirty solution to the drainage system; however, the activity may be permitted for disposal in the wastewater system if approved by the City. For more information and to determine whether a type of chemical and an amount of water are permitted for discharge to the sanitary sewer system, contact the City Operations Division. If sanitary sewer disposal is not available or not allowed, the collected wastewater must be treated or transferred to a holding tank, where it must be picked up for disposal by a licensed waste hauler. The following BMPs or equivalent measures are required of all businesses and public agencies engaged in washing, pressure washing, or steam cleaning of vehicles, equipment, and building structures: • Conduct indoor vehicle and equipment washing operations in an area that drains to the wastewater system and that prevents the wash water from running outside and entering the surface water management system. • Conduct outdoor vehicle and equipment washing operations in a designated wash area that drains to a sump (like a grit separator) or a catch basin and then to the sanitary or another appropriate wastewater treatment or recycling system. • If adjacent to a building or constructed over hazardous material storage areas, roofs and covers are also regulated by the Fire Code. • At gasoline stations, multi-family residences, and any other business and public agency where vehicles are washed, clearly mark the washing area. A connection permit is required to connect to the City's wastewater system. For information about connection permits, call the City Building Department. In some cases, wash water may need to be pretreated before it is discharged to the sanitary sewer. Outdoor Storage or Transfer of Solid Raw Materials, Byproducts, or Finished Products This BMP applies to businesses and public agencies on whose premises there will be outdoor storage and transfer of solid raw materials, byproducts, or products such as, but not limited to, gravel, sand, salts, topsoil, compost, logs, sawdust, wood chips, lumber and other building materials, concrete, and metal products typically stored outside in large piles or stacks at commercial or industrial establishments. If stormwater comes in contact with the stockpiled materials listed above, pollutants can be leached or erosion of the stored materials may occur. Potential pollutants include suspended solids, substances that increase biological oxygen demand, organic compounds, and dissolved salts (e.g., sodium chloride, calcium chloride, and magnesium chloride). These pollutants must not be discharged to the drainage system or directly into receiving waters. General Recommendations Cover and contain materials to prevent erosion. Erosion results in stormwater contamination and loss of valuable product. J-1.16 Required Best Management Practices The following BMPs or equivalent measures are required of all businesses and public agencies engaged in the outdoor storage or transfer of solid raw materials, byproducts, or finished products: • Do not hose down the contained stockpile area if the discharge will flow into a storm drain or a drainage conveyance. • Sweep paved storage areas daily or more often as necessary to collect and dispose of loose solid materials. • For stockpiles containing more than 5 cubic yards of erodible or water-soluble materials such as soil, deicing salts for roads, compost, unwashed sand and gravel, and sawdust; and for outside storage areas for solid materials such as logs, bark, lumber, and metal products, choose one or more of the following BMPs: Store in a building or a covered, paved area, preferably surrounded by a berm. Place temporary plastic sheeting (polyethylene, polypropylene, hypalon, or equivalent material) over the material. J-1.17 APPENDIX K MAINTENANCE CHECKLISTS K Rain Gardens and Planters Facility Name: Facility Location: Maintenance Item I DEC I JAN I FEB I MAR I APR I MAY I JUN I JUL I AUG I SEP I OCT I NOV I Storm GENERAL STRUCTURAL REPAIRS Remove sediment and debris from catch basins,trench drains,curb inlets,and pipes to mainteina at least 50%conveyance capacity at all times.Manually remove sediment accumulation for sand filters. Check for cracked drain pipes. Repair/seal cracks.Replace when repair is insufficient. Maintain 4 to 10 inch-deep rock in check dams at 12 to 20 foot intervals. Remove trash or other debris from facility and trash rack(if I I I I I I I 1111111111 applicable). PONDING AREA (Determined By Inspection) Inspect for soil erosion(such as channels,cuts and soil migration).If channels or cuts are over 2 inches wide,fill,lightly compact,and plant vegetation to disperse flow. Replace splash blocks or inlet gravel/rock. If erosion problems persist,the following should be reassessed:(1) flow volumes from contributing areas and bioretention cell sizing;(2) flow velocities and gradients within the cell;and(3)flow dissipation and erosion protection strategies in the pretreatment area and flow entrance. (Once/3 years) If sediment or debris accumulates to extent that infiltration rate is reduced or surface storage capacity is significantly impacted,remove sediment when facility is dry.Remove manually using shovels.Dispose of sediments in accordance with COS requirements.Replace any vegetation damaged or destroyed by sediment accumulation and removal.Mulch newly planted vegetation.Report areas of heavy or frequent sediment buildup. IRRIGATION Startup irrigation system,set timer,and test system for issues Inspect irrigation system for correct operation,water coverage and/or broken lines during seasons of active use. K- 1.0 Rain Gardens and Planters Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm Check irrigation lines for breaks Check valves for operation Replace damaged connections,pipe accessories Irrigate during hot,dry seasons,based on plant needs. Irrigate deeply and thoroughly,but less frequently. Flush irrigation system and winterize system;insulate live supply lines VEGETATION MANAGEMENT If vegetation covers<90%of facility or area surrounding facility,or weeds cover>10%of area,determine cause of poor vegetation growth and correct condition.Replant as necessary to obtain coverage. If tall or overgrown vegetation inerfere with facility operation,access for maintenance,traffic sight lines,or foot traffic,prune or remove vegetation. Edge and trim facility edges. Replace dead or strained vegetations per original planting plan,or substitute with approved appropriate replacement.(First 2 years) Remove fallen leaves and debris. Manually remove weeds.Remove all weedy debris. If noxious weeds are present,develop a management control plan to remove noxious weeds.Watch for and respond to new occurrences of especially aggressive weeds such as Himalayan blackberry,Japanese knotweed,morning glory,English ivy,reed canary grass and horsetail to avoid invasions. Check for exposed soil:cover with plants and mulch as needed. For staking and guying: (As Needed) • Repair tree stakes and guys as needed. • Remove tree stakes as soon as they are no longer needed for tree stabilization(Minimum of one year and a maximum of two years after installation). • Inspect and adjust stakes and connections to provide support,to prevent girdling of trunks or branches,and to prevent rubbing that causes bark wounds. Replenish composted mulch after weeding. Replenish mulch to a minimum 2"depth. K-1.2 Rain Gardens and Planters Facility Name: Facility Location: Maintenance Item I DEC I JAN I FEB I MAR I APR I MAY I JUN I JUL I AUG I SEP I OCT I NOV I Storm PRUNING (Cut back foliage before (Cut back dead foliage Ornamental Grasses(Perennial):If dead material from previous collapses) before new growth years'growing cycle and dead collapsed foliage are present,Leave dry emerges) foliage for winter interest.Cut it back to within several inches from the soil before new growth emerges or earlier if the foliage collapses. Ornamental Grasses(Evergreen): If dead growth is present in spring, (Cut back dead foliage (Cut back to ground or Hand rake with a small rake or fingers.Cut when grasses become too before new growth thin every 2-3 years as tall. emerges) needed) Prune Prune early blooming Prune tree suckers as Prune sap bleeder plant dormant trees and shrubs as needed. group as needed. season needed,following bloom. plant group as needed. Trees and shrubs:Pruning of trees and shrubs Multi-stemmed shrubs:Selectively prune 1-2 large stems from center of multi-stemmed shrubs if new growth and stem color are continually desired within the landscape(e.g.dogwood and willow species). Prune only during dormant season and best just prior to bud break. GROWING/FILTER MEDIUM Identify potential erosion(by wind or water)areas and take measures to stabilze soil(e.g.facility slopes and banks). Fill gullies,lightly compact,and plant to disperse flow.Growing medium and plants should be appropriate as per original plans or substiture with approved appropriate replacement. Check for ponded water.Rake,till or amend to restore infiltration rate. If water remains in the basin 48 hours or longer at the end of a storm, ensure that under drain(if present)is not clogged. If necessary,clear under drain.If this is not the problem,the bioretention soil is likely clogged. Remove upper 3 inches of soil and replace with imported bioretention soil.Identify sources of clogging and correct. K-1.3 Rain Gardens and Planters Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN I JUL I AUG SEP OCT NOV Storm For water ponding longer than a 48 hour period,rake and remove layer of oil and sediment and restore infiltration rate. Restore outfalls or splash blocks where necessary. Maintain organic matter content of soil,optimize soil moisture retention,prevent erosion,and enhance plant growth and survivability. Add compost or mulch:Spread material by hand to minimize damage to plant material and keep the base of stems clear of compost or mulch. When performing extensive maintenance((e.g.,major plant changes, tree removal,utility or irrigation work),place 2-4-foot long x 6-to 8- inch wide board(s)for walking and standing on in swales,to distribute weight and avoid soil compaction.Stay on board during construction/ repairs to reduce compaction. Lay board flat on bottom of swale taking care not to damage plants. INTEGRATED PEST MANAGEMENT Follow Integrated Pest Manaement Plan and schedule for facility type. Do not apply herbicides or pesticides to the facility. Survey for presence of detrimental insects and pests SPILL PREVENTION AND RESPONSE All sites shall implement best management practices to prevent hazardous or solid wastes or excessive oil and sediment from contaminating stormwater.Contact Spill Prevention&Citizen Response at 503-823-7180 for immediate assistance responding to spills. Record time/date,weather,and site conditions if site activities contaminate stormwater. Cleanup spills as soon as possible to prevent contamination of stormwater. AESTHETICS If damage/vandalism/or debris accumulation occur,restore roof to original aesthetic conditions. PEST CONTROL K-1.4 Rain Gardens and Planters Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm If facility does not drain within 24 hours,record time/date,weather, and site conditions when vector actiivity observed. Record when vector abatement started and ended. If rodent holes are present,fill and compost soil around the holes. Record time/date,weather,and site conditions when vector actiivity observed. Record when vector abatement started and ended. K-1.5 Trenches and Drywells Facility Name: Facility Location: Maintenance Item I DEC I JAN I FEB I MAR I APR I MAY I JUN I JUL I AUG I SEP I OCT I NOV I Storm GENERAL When accumulated trash and debris impede facility performance,clear piping to facility, clean gutters, rain drains,and silt traps. (Inspect at least once during wet season and as For any visible accumulation of oil, gas, appropriate after major rain events(>1 inch of paint,or other contaminant(includes precipitation within 24 hours)) concrete debris or slurry), remove/dispose in accordance with state and federal regulation. If possible, identify and control source. When ponding water occurs,Clear piping through facility. Replace rock/ sand reservoirs as necessary. Tilling of subgrade below reservoir may be necessary(for trenches) prior to backfill. May require decommissioning and replacement. If splash pad is missing or damaged, (Annually,or as needed after major rain events.) repair or replace. If leaves are clogging the roof downspout, remove and of leaves. Repair/seal cracks in cracked drain pipes or manholes. Replace when repair is insufficient. K- 1.6 Trenches and Drywells Facility Name: Facility Location: Maintenance Item I DEC I JAN I FEB I MAR I APR I MAY I JUN I JUL I AUG I SEP I OCT I NOV I Storm STORAGE SUMP For accumulated material within 18 inches of the bottom of the outlet pipe or greater than designed sediment depth for sump, remove/dispose in accordance with state and federal regulations. Repair or replace maintenance holes that cannot be opened by one person, locking bolts that are missing or damaged, or locking threads that are less than 1/2 inch of thread. It maintenance holes are buried, expose and restore to surface grade. Maintain ingress/egress. If maintenance hole cover is missing, replace cover. VEGETATION MANAGEMENT Prevent large root systems from damaging subsurface structural components. INTEGRATED PEST MANAGEMENT Do not apply herbicides or pesticides to the facility. Survey for presence of detrimental insects and pests K-1.7 Green roofs Facility Name: Facility Location: Maintenance Item I DEC I JAN I FEB I MAR I APR I MAY I JUN I JUL I AUG I SEP I OCT I NOV I Storm STRUCTURAL REPAIRS Check membrane for tears.Contact manufacturer for repair or replacement. Inspect structural components for deterioration or failure.Repair any leaks or structural deficiencies as necessary. If sediment,vegetation,or debris blocks 50%or more of inlet structure,clear blockage.Identify and correct any problems that led to blockage. Keep photo record of debris blockage and clearance in order to rectify long-term issues. Inspect for clogged drains. Repair leaks or structural deficiencies. Remove sediment or debris if necessary. IRRIGATION Start and test system for proper function and the potential need for repairs. Determine irrigation schedule by inspection.Adjust irrigation program or consult professional to set system at correct watering system.Use irrigation only when absolutely necessary for plant survival. Close down and drain system after final annual inspection. VEGETATION MANAGEMENT For sedum-covered green roofs,mow sedums-cuttings from existing plants to encourage colonization during first 2 years of plant establishment and on an as needed basis thereafter. Inspect vegetation coverage.If vegetation coverage falls below 90%, apply additional sedum cuttings to cover exposed soil areas OR replace with appropriate plantings. Cut back and remove flower heads on sedums K- 1.8 Green roofs Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm If weeds are present,manually remove or dispose of weed material. Do not use pesticides or herbicides to treat weeds.At a minimum, schedule weeding with inspections to coincide with important horticultural cycles(e.g.,prior to major weed varieties dispersing seeds). If tall,dry grass exists,prune grass and remove clippings. Remove plantings that are colonizing areas not specified to be vegetated,such as ballasted areas and flashing along parapet GROWING/FILTER MEDIUM Maintain a 4"profile of soil.Address settling and stability issues of material. Check for eroded soils and gullies. Fill,hand tamp or lightly compact, and plant vegetation to disperse flow. Check for crusting,dry,or slipping medium.Rake or amend to restore filtration or flow. Check for ponded water.Rake,till or amend to restore infiltration rate. Remove/dispose of fallen leaves or debris once annually. Check for exposed soil.Replant bare areas to maintain 90%vegetation coverage. INTEGRATED PEST MANAGEMENT Follow Integrated Pest Management Plan and schedule for facility type. Survey for presence of detrimental insects and pests If facility does not drain within 24 hours,record time/date,weather, and site conditions when vector activity observed. Record when vector abatement started and ended. If rodent holes are present,fill and compost soil around the holes. Record time/date,weather,and site conditions when vector actiivity observed. Record when vector abatement started and ended. K-1.9 Green roofs Facility Name: Facility Location: Maintenance Item I DEC I JAN I FEB I MAR I APR I MAY I JUN I JUL I AUG I SEP I OCT I NOV I Storm SPILL PREVENTION AND RESPONSE All sites shall implement best management practices to prevent hazardous or solid wastes or excessive oil and sediment from contaminating stormwater.Contact Spill Prevention&Citizen Response at 503-823-7180 for immediate assistance responding to spills. Record time/date,weather,and site conditions if site activities contaminate stormwater. Cleanup spills as soon as possible to prevent contamination of stormwater. ACCESS AND SAFETY Maintain egress and ingress:Clear routes of obstructions and maintained to design standards. Inspect fire ventilation points for proper operation AESTHETICS If damage/vandalism/or debris accumulation occur,restore roof to original aesthetic conditions. K-1.10 Permeable Pavement Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm All Permeable Pavements If infiltration capacity of surface is retricted due to clogging,remove sediment and debris with vacuum sweeper.Use industrial pressure washer to restore permeability. Anticipate maintenance one to two times annually. For moss growth,pressue wash,vacuum sweep,or use a combination of the two. Remove sediment,debris,vegetation and any compacted materials such as trash. (As Needed) Backfill utility cuts:Use same aggregate base as under permeable paving.Small utility cuts can be repaired with permeable top course or with conventional asphalt or concrete if small batches of permeable material are not available or are too expensive. For cracked or moving edge restraints,repair per manufacturer's specifications. (As Needed) Washouts:When stormwater flows out of planted areas or swales and deposits soil,mulch or sediment on paving or elsewhere,Clean deposited soil or other materials from porous pavement or other adjacent surfacing. Inlet/Outlet Pipes:If pipe is damaged,repair or replace the pipe. If pipe is clogged,remove roots or debris. Outlet Pipe/Structure:If sediment,vegetation,or debris is blocking 1/2 capacity of inlet structure,clear the blockage. Identify the source of the blockage and take actions to prevent future blockages. K-1.11 Permeable Pavement Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm Permeable Asphalt or Cement Concrete For major cracks,trip hazards,settled pavement,concrete spalling and raveling, Repair per manufacturer's specifications.Take appropriate precautions to prevent clogging of adjacent porous materials. When snow accumulates and restricts maintenance access,use conventional snow removal techniques. Do not add sand. Open-Celled Paving Grid If paving grid is missing or damaged,replace or repair damaged paving gird. (Determined by inspection) If clogged with sediment or contaminated,maintain infiltration capacity using vacuum trucks for stormwater collection basins to remove and replace top course aggregate.Permeable gravel paving systems have a very high void to surface coverage ratio.System failure due to clogging is unlikely except in unusual circumstances. Maintain structural integrity by replenishing aggregate material: (Determined by inspection) Spread gravel with rake. Gravel level should be maintained at the same level as the plastic rings or above the top of rings. (Determined by inspection) Remove and replace grid segments where damaged: Remove pins,pry up grid segments,replace gravel. Replace grid segments where three or more adjacent rings are If surface settlement occurs,facility may require resetting. For loss of granular material,refill per manufacturer's recommendations. Perform 0&M per manufacturer's recommendations. (Schedule based on manufacturer's instructions) Pavers or Interlocking Concrete Paver Blocks (Determined by inspection) If issues occur with infiltration capacity,replace aggregate in paver cells.Remove aggregate with suction equipment.Clogging is usually an issue in the upper most few centimeters of aggregate.Check infiltration at various depths in the aggregate profile to determine excavation depth. K-1.12 Permeable Pavement Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm When repairing utilities,maintain strucutural integrity of pavement. (When maintaining utilities) Remove pavers individually by hand and replaced when utility work is complete. Pavers can be removed individually and replaced when utility work is complete. (Determined by inspection) Maintain structural integrity of pavement by replacing broken pavers. Remove individual pavers by hand and replace. Snow removal:Use snow plow with skids or rollers to slightly raise blade above gravel surface. Elevating blades slightly above the aggregate surface prevents loss of top course aggregate and damage to plastic grid. Filter Medium For aggregate loss in pavers from settling and power washing,replace paver pore space with aggregate from original design,per manufacturer's specifications. Vegetation Sweep leaf litter and sediment to prevent surface clogging and ponding Prevent large root systems from damaging subsurface structural components Manually remove weeds.Do not use herbicides.Mow,torch,or inoculate with preferred vegetation.Many pavers are designed to have pore space vegetation. Do not torch plastic/poly paving grids. For accumulation of organic debris and leaf litter,use leaf blowers to move and collect organic debris,DO NOT blow any material over or across porous pavements.Material should be blown off of and away from porous paving. Edge and trim planted areas to control groundcovers and shrubs from overreaching the sidewalks,paths,and street edges. K-1.13 Permeable Pavement Facility Name: Facility Location: Maintenance Item I DEC I JAN I FEB I MAR I APR I MAY I JUN I JUL I AUG I SEP I OCT I NOV I Storm Infiltration/Flow Control For ponding>48 hours,record time/date,weather,and site I (As Needed) I I (As Needed) conditions when ponding occurs. SPILL PREVENTION AND RESPONSE All sites shall implement best management practices to prevent hazardous or solid wastes or excessive oil and sediment from contaminating stormwater.Contact Spill Prevention&Citizen Response at 503-823-7180 for immediate assistance responding to spills. Record time/date,weather,and site conditions if site activities contaminate stormwater. Cleanup spills as soon as possible to prevent contamination of stormwater. PEST CONTROL If rodent holes are present,fill and compost soil around the holes. Record time/date,weather,and site conditions when vector actiivity observed. Record when vector abatement started and ended. K-1.14 Rainwater Harvesting Facility Name: Facility Location: Maintenance Item I DEC I JAN I FEB I MAR I APR I MAY I JUN I JUL I AUG I SEP I OCT I NOV I Storm GENERAL Remove debris from roof and gutters when debris has accumulated. Twice annually. Replace downspout leaf shield and mosquito screens if it has deteriorated. Clear the downspout leaf shield and mosquito screens at inlet and overflow of debris. Repair or replace damaged overflow pipes. Remove debris from clogged pipes. For detention cisterns,clean the low flow orifice. (Schedule and Instructions Vary) For rainwater harvesting delivery and distribution systems,follow the manufacturer's instructions for operations and maintenance(e.g., backflow prevention inspections,valve schedules and operation, backup and cross connection,and seasonal startup and shutdown and freeze protection). (Schedule and Instructions Vary) For rainwater harvesting treatment and use equipment,follow manufacturer's instructions for operation and maintenance(e.g., replacing and/or cleaning filters,removing sediment and other pollutants from storage systems). K-1.15 Filter Strips Facility Name: Facility Location: Maintenance Item I DEC I JAN I FEB I MAR I APR I MAY I JUN I JUL I AUG I SEP I OCT I NOV I Storm STRUCTURAL REPAIRS Remove sediment and debris from catch basins,trench drains,curb inlets,and pipes to mainteina at least 50%conveyance capacity at all times.Manually remove sediment accumulation for sand filters. Check for cracked drain pipes. Repair/seal cracks.Replace when repair is insufficient. Clear accumulated silt from ineffective flow spreaders. Remove trash or other debris from facility and trash rack(if applicable). WHIM PONDING AREA IRRIGATION Startup irrigation system,set timer,and test system for issues Inspect irrigation system for correct operation,water coverage and/or broken lines during seasons of active use. Check irrigation lines for breaks Check valves for operation Replace damaged connections,pipe accessories Irrigate during hot,dry seasons,based on plant needs. Irrigate deeply and thoroughly,but less frequently. Flush irrigation system and winterize system;insulate live supply lines VEGETATION MANAGEMENT If vegetation covers<90%of facility or area surrounding facility,or weeds cover>10%of area,determine cause of poor vegetation growth and correct condition.Replant as necessary to obtain coverage. If tall or overgrown vegetation inerfere with facility operation,access for maintenance,traffic sight lines,or foot traffic,prune or remove vegetation. Edge and trim facility edges. Replace dead or strained vegetations per original planting plan,or substitute with approved appropriate replacement.(First 2 years) Remove fallen leaves and debris. Manually remove weeds. Remove all weedy debris. K-1.16 Filter Strips Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm If noxious weeds are present,develop a management control plan to remove noxious weeds.Watch for and respond to new occurrences of especially aggressive weeds such as Himalayan blackberry,Japanese knotweed,morning glory,English ivy,reed canary grass and horsetail to avoid invasions. Check for exposed soil:cover with plants and mulch as needed. For staking and guying: (As Needed) • Repair tree stakes and guys as needed. • Remove tree stakes as soon as they are no longer needed for tree stabilization(Minimum of one year and a maximum of two years after installation). • Inspect and adjust stakes and connections to provide support,to prevent girdling of trunks or branches,and to prevent rubbing that causes bark wounds. Replenish composted mulch after weeding. Replenish mulch to a minimum 2"depth. PRUNING (Cut back foliage before (Cut back dead foliage Ornamental Grasses(Perennial):If dead material from previous collapses) before new growth years'growing cycle and dead collapsed foliage are present, Leave dry emerges) foliage for winter interest.Cut it back to within several inches from the soil before new growth emerges or earlier if the foliage collapses. Ornamental Grasses(Evergreen): If dead growth is present in spring, (Cut back dead foliage (Cut back to ground or Hand rake with a small rake or fingers.Cut when grasses become too before new growth thin every 2-3 years as tall. emerges) needed) Prune Prune early blooming Prune tree suckers as Prune sap bleeder plant dormant trees and shrubs as needed. group as needed. season needed,following bloom. plant group as needed. Trees and shrubs:Pruning of trees and shrubs _ Multi-stemmed shrubs:Selectively prune 1-2 large stems from center of multi-stemmed shrubs if new growth and stem color are continually desired within the landscape(e.g.dogwood and willow species).Prune only during dormant season and best just prior to bud break. K- 1.17 Filter Strips Facility Name: Facility Location: Maintenance Item DEC I JAN I FEB I MAR I APR I MAY JUN I JUL AUG I SEP I OCT I NOV I Storm Cut back vegetation to 4-6 inches 1-2 times each year. GROWING/FILTER MEDIUM Identify potential erosion(by wind or water)areas and take measures to stabilze soil(e.g.facility slopes and banks). Fill gullies,lightly compact,and plant to disperse flow.Growing medium and plants should be appropriate as per original plans or substiture with approved appropriate replacement. Fill gullies,lightly compact,and install flow spreader/plant vegetation I I I I I I I I I I I I I I I I I I I I I I I I I I I I I to disperce flow. Check for erosion.Restore,replace,or create splach blocks or inlet gravel/rock as needed. Check for crusting,dry,or slipping medium.Rake or amend to restore filtration or flow. Check for ponded water.Rake,till or amend to restore infiltration rate. Maintain organic matter content of soil,optimize soil moisture retention,prevent erosion,and enhance plant growth and survivability. Add compost or mulch:Spread material by hand to minimize damage to plant material and keep the base of stems clear of compost or mulch. When performing extensive maintenance((e.g.,major plant changes, tree removal,utility or irrigation work),place 2-4-foot long x 6-to 8- inch wide board(s)for walking and standing on in swales,to distribute weight and avoid soil compaction.Stay on board during construction/ repairs to reduce compaction. Lay board flat on bottom of swale taking care not to damage plants. INTEGRATED PEST MANAGEMENT Follow Integrated Pest Manaement Plan and schedule for facility type. Do not apply herbicides or pesticides to the facility. Survey for presence of detrimental insects and pests SPILL PREVENTION AND RESPONSE K-1.18 Filter Strips Facility Name: Facility Location: Maintenance Item I DEC I JAN I FEB I MAR I APR I MAY I JUN I JUL I AUG I SEP I OCT I NOV I Storm All sites shall implement best management practices to prevent hazardous or solid wastes or excessive oil and sediment from contaminating stormwater.Contact Spill Prevention&Citizen Response at 503-823-7180 for immediate assistance responding to spills. Record time/date,weather,and site conditions if site activities contaminate stormwater. Cleanup spills as soon as possible to prevent contamination of stormwater. PEST CONTROL If rodent holes are present,fill and compost soil around the holes. Record time/date,weather,and site conditions when vector actiivity observed. Record when vector abatement started and ended. K-1.19 Swales Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm GENERAL STRUCTURAL REPAIRS Remove sediment and debris from catch basins,trench drains,curb inlets,and pipes to mainteina at least 50%conveyance capacity at all times.Manually remove sediment accumulation for sand filters. Check for cracked drain pipes. Repair/seal cracks.Replace when repair is insufficient. Maintain 4 to 10 inch-deep rock in check dams at 12 to 20 foot intervals. Remove trash or other debris from facility and trash rack(if I I I I I I I 111111111111 applicable). PONDING AREA (Determined By Inspection) Inspect for soil erosion(such as channels,cuts and soil migration).If channels or cuts are over 2 inches wide,fill,lightly compact,and plant vegetation to disperse flow. Replace splash blocks or inlet gravel/rock. If erosion problems persist,the following should be reassessed:(1) flow volumes from contributing areas and bioretention cell sizing;(2) flow velocities and gradients within the cell;and(3)flow dissipation and erosion protection strategies in the pretreatment area and flow entrance. (Once/3 years) If sediment or debris accumulates to extent that infiltration rate is reduced or surface storage capacity is significantly impacted,remove sediment when facility is dry.Remove manually using shovels.Dispose of sediments in accordance with COS requirements.Replace any vegetation damaged or destroyed by sediment accumulation and removal.Mulch newly planted vegetation.Report areas of heavy or frequent sediment buildup. Basin Inlet Splash Blocks:If water splashes adjacent to splash block or water disrupts soil media,reconfigue/repair blocks. IRRIGATION Startup irrigation system,set timer,and test system for issues K- 1.20 Swales Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm Inspect irrigation system for correct operation,water coverage and/or broken lines during seasons of active use. Check irrigation lines for breaks Check valves for operation Replace damaged connections,pipe accessories Irrigate during hot,dry seasons,based on plant needs. Irrigate deeply and thoroughly,but less frequently. Flush irrigation system and winterize system;insulate live supply lines VEGETATION MANAGEMENT If vegetation covers<90%of facility or area surrounding facility,or weeds cover>10%of area,determine cause of poor vegetation growth and correct condition.Replant as necessary to obtain coverage. If tall or overgrown vegetation inerfere with facility operation,access for maintenance,traffic sight lines,or foot traffic,prune or remove vegetation. Edge and trim facility edges. Replace dead or strained vegetations per original planting plan,or substitute with approved appropriate replacement.(First 2 years) Remove fallen leaves and debris. Manually remove weeds. Remove all weedy debris. If noxious weeds are present,develop a management control plan to remove noxious weeds.Watch for and respond to new occurrences of especially aggressive weeds such as Himalayan blackberry,Japanese knotweed,morning glory,English ivy,reed canary grass and horsetail to avoid invasions. Check for exposed soil:cover with plants and mulch as needed. K-1.21 Swales Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm For staking and guying: (As Needed) • Repair tree stakes and guys as needed. • Remove tree stakes as soon as they are no longer needed for tree stabilization(Minimum of one year and a maximum of two years after installation). • Inspect and adjust stakes and connections to provide support,to prevent girdling of trunks or branches,and to prevent rubbing that causes bark wounds. Replenish composted mulch after weeding. Replenish mulch to a minimum 2"depth. PRUNING (Cut back foliage before (Cut back dead foliage Ornamental Grasses(Perennial):If dead material from previous collapses) before new growth years'growing cycle and dead collapsed foliage are present,Leave dry emerges) foliage for winter interest.Cut it back to within several inches from the soil before new growth emerges or earlier if the foliage collapses. Ornamental Grasses(Evergreen): If dead growth is present in spring, (Cut back dead foliage (Cut back to ground or Hand rake with a small rake or fingers.Cut when grasses become too before new growth thin every 2-3 years as tall. emerges) needed) Prune Prune early blooming Prune tree suckers as Prune sap bleeder plant dormant trees and shrubs as needed. group as needed. season needed,following bloom. plant group as needed. Trees and shrubs:Pruning of trees and shrubs Multi-stemmed shrubs:Selectively prune 1-2 large stems from center of multi-stemmed shrubs if new growth and stem color are continually desired within the landscape(e.g.dogwood and willow species). Prune only during dormant season and best just prior to bud break. GROWING/FILTER MEDIUM Identify potential erosion(by wind or water)areas and take measures to stabilze soil(e.g.facility slopes and banks). Fill gullies,lightly compact,and plant to disperse flow.Growing medium and plants should be appropriate as per original plans or substiture with approved appropriate replacement. K-1.22 Swales Facility Name: Facility Location: Maintenance Item I DEC I JAN I FEB I MAR I APR I MAY I JUN I JUL I AUG I SEP I OCT I NOV I Storm Check for ponded water.Rake,till or amend to restore infiltration rate. If water remains in the basin 48 hours or longer at the end of a storm, ensure that under drain(if present)is not clogged. If necessary,clear under drain.If this is not the problem,the bioretention soil is likely clogged. Remove upper 3 inches of soil and replace with imported bioretention soil.Identify sources of clogging and correct. For water ponding longer than a 48 hour period,rake and remove layer of oil and sediment and restore infiltration rate. Restore outfalls or splash blocks where necessary. Maintain organic matter content of soil,optimize soil moisture retention,prevent erosion,and enhance plant growth and survivability. Add compost or mulch:Spread material by hand to minimize damage to plant material and keep the base of stems clear of compost or mulch. When performing extensive maintenance((e.g.,major plant changes, tree removal,utility or irrigation work),place 2-4-foot long x 6-to 8- inch wide board(s)for walking and standing on in swales,to distribute weight and avoid soil compaction.Stay on board during construction/ repairs to reduce compaction. Lay board flat on bottom of swale taking care not to damage plants. INTEGRATED PEST MANAGEMENT Follow Integrated Pest Manaement Plan and schedule for facility type. Do not apply herbicides or pesticides to the facility. Survey for presence of detrimental insects and pests Check for vectors Check for ponding Check for pollution SPILL PREVENTION AND RESPONSE K-1.23 Swales Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm All sites shall implement best management practices to prevent hazardous or solid wastes or excessive oil and sediment from contaminating stormwater.Contact Spill Prevention&Citizen Response at 503-823-7180 for immediate assistance responding to spills. Record time/date,weather,and site conditions if site activities contaminate stormwater. Cleanup spills as soon as possible to prevent contamination of stormwater. AESTHETICS If damage/vandalism/or debris accumulation occur,restore roof to original aesthetic conditions. PEST CONTROL If facility does not drain within 24 hours,record time/date,weather, and site conditions when vector actiivity observed. Record when vector abatement started and ended. If rodent holes are present,fill and compost soil around the holes. Record time/date,weather,and site conditions when vector actiivity observed. Record when vector abatement started and ended. K-1.24 Sand Filters Facility Name: Facility Location: Maintenance Item I DEC I JAN I FEB I MAR I APR I MAY I JUN I JUL I AUG I SEP I OCT I NOV I Storm STRUCTURAL REPAIRS Remove sediment and debris from catch basins,trench drains,curb inlets,and pipes to mainteina at least 50%conveyance capacity at all times.Manually remove sediment accumulation for sand filters. Check for cracked drain pipes. Repair/seal cracks.Replace when repair is insufficient. Remove trash or other debris from facility and trash rack(if applicable). WHIM IRRIGATION Startup irrigation system,set timer,and test system for issues Inspect irrigation system for correct operation,water coverage and/or broken lines during seasons of active use. Check irrigation lines for breaks Check valves for operation Replace damaged connections,pipe accessories Irrigate during hot,dry seasons,based on plant needs. Irrigate deeply and thoroughly,but less frequently. Flush irrigation system and winterize system;insulate live supply lines VEGETATION MANAGEMENT If tall or overgrown vegetation inerfere with facility operation,access for maintenance,traffic sight lines,or foot traffic,prune or remove vegetation. Edge and trim facility edges. Replace dead or strained vegetations per original planting plan,or substitute with approved appropriate replacement.(First 2 years) Remove fallen leaves and debris. Manually remove weeds.Remove all weedy debris. K- 1.25 Sand Filters Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm If noxious weeds are present,develop a management control plan to remove noxious weeds.Watch for and respond to new occurrences of especially aggressive weeds such as Himalayan blackberry,Japanese knotweed,morning glory,English ivy,reed canary grass and horsetail to avoid invasions. Check for exposed soil:cover with plants and mulch as needed. PRUNING (Cut back foliage before (Cut back dead foliage Ornamental Grasses(Perennial):If dead material from previous collapses) before new growth years'growing cycle and dead collapsed foliage are present, Leave dry emerges) foliage for winter interest.Cut it back to within several inches from the soil before new growth emerges or earlier if the foliage collapses. Ornamental Grasses(Evergreen): If dead growth is present in spring, (Cut back dead foliage (Cut back to ground or Hand rake with a small rake or fingers.Cut when grasses become too before new growth thin every 2-3 years as tall. emerges) needed) Prune Prune early blooming Prune tree suckers as Prune sap bleeder plant dormant trees and shrubs as needed. group as needed. season needed,following bloom. plant group as needed. Trees and shrubs:Pruning of trees and shrubs Multi-stemmed shrubs:Selectively prune 1-2 large stems from center of multi-stemmed shrubs if new growth and stem color are continually desired within the landscape(e.g.dogwood and willow species).Prune only during dormant season and best just prior to bud break. GROWING/FILTER MEDIUM Identify potential erosion(by wind or water)areas and take measures to stabilze soil(e.g.facility slopes and banks). For water ponding longer than a 48 hour period,rake and remove layer of oil and sediment and restore infiltration rate. Restore outfalls or splash blocks where necessary. INTEGRATED PEST MANAGEMENT K-1.26 Sand Filters Facility Name: Facility Location: Maintenance Item DEC I JAN I FEB I MAR I APR I MAY I JUN I JUL I AUG I SEP I OCT I NOV I Storm Do not apply herbicides or pesticides to the facility. Survey for presence of detrimental insects and pests SPILL PREVENTION AND RESPONSE All sites shall implement best management practices to prevent hazardous or solid wastes or excessive oil and sediment from contaminating stormwater.Contact Spill Prevention&Citizen Response at 503-823-7180 for immediate assistance responding to spills.Record time/date,weather,and site conditions if site activities contaminate stormwater. Cleanup spills as soon as possible to prevent contamination of stormwater. K-1.27 Constructed Wetlands Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm GENERAL If a beaver dam results in a functional change of a facility,return facility to design function and modify design as necessary to discourage beaver use. DRY PONDING AREA Remove and dispose of accumulated sediment when it exceeds 10% of ponding depth or 1 foot,whichever is less. Repair or replace liner if it is visible and has more than three 1/4-inch holes in it. PONDING AREA IRRIGATION Startup irrigation system,set timer,and test system for issues Inspect irrigation system for correct operation,water coverage and/or broken lines during seasons of active use. Check irrigation lines for breaks Check valves for operation Replace damaged connections,pipe accessories Irrigate during hot,dry seasons,based on plant needs. Irrigate deeply and thoroughly,but less frequently. Flush irrigation system and winterize system;insulate live supply lines VEGETATION MANAGEMENT If tall or overgrown vegetation inerfere with facility operation,access for maintenance,traffic sight lines,or foot traffic,prune or remove vegetation. Edge and trim facility edges. Replace dead or strained vegetations per original planting plan,or substitute with approved appropriate replacement.(First 2 years) Remove fallen leaves and debris. Manually remove weeds. Remove all weedy debris. K- 1.28 Constructed Wetlands Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm If noxious weeds are present,develop a management control plan to remove noxious weeds.Watch for and respond to new occurrences of especially aggressive weeds such as Himalayan blackberry,Japanese knotweed,morning glory,English ivy,reed canary grass and horsetail to avoid invasions. Check for exposed soil:cover with plants and mulch as needed. For staking and guying: (As Needed) • Repair tree stakes and guys as needed. • Remove tree stakes as soon as they are no longer needed for tree stabilization(Minimum of one year and a maximum of two years after installation). • Inspect and adjust stakes and connections to provide support,to prevent girdling of trunks or branches,and to prevent rubbing that causes bark wounds. Replenish composted mulch after weeding. Replenish mulch to a minimum 2"depth. (Tree Removal) (Tree If tree growth impeeds maintenance access,maintenance activity,or Replacement) disrupts facility function or capacity,trim or remove trees. Remove and replace, dead,diseased or dying trees. PRUNING (Cut back foliage before (Cut back dead foliage Ornamental Grasses(Perennial):If dead material from previous collapses) before new growth years'growing cycle and dead collapsed foliage are present, Leave dry emerges) foliage for winter interest.Cut it back to within several inches from the soil before new growth emerges or earlier if the foliage collapses. Ornamental Grasses(Evergreen): If dead growth is present in spring, (Cut back dead foliage (Cut back to ground or Hand rake with a small rake or fingers.Cut when grasses become too before new growth thin every 2-3 years as tall. emerges) needed) Prune Prune early blooming Prune tree suckers as Prune sap bleeder plant dormant trees and shrubs as needed. group as needed. season needed,following bloom. plant group as needed. Trees and shrubs:Pruning of trees and shrubs K-1.29 Constructed Wetlands Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm Multi-stemmed shrubs:Selectively prune 1-2 large stems from center of multi-stemmed shrubs if new growth and stem color are continually desired within the landscape(e.g.dogwood and willow species).Prune only during dormant season and best just prior to bud break. GROWING/FILTER MEDIUM Identify potential erosion(by wind or water)areas and take measures to stabilze soil(e.g.facility slopes and banks). Fill gullies,lightly compact,and plant to disperse flow.Growing medium and plants should be appropriate as per original plans or substiture with approved appropriate replacement. Maintain organic matter content of soil,optimize soil moisture retention,prevent erosion,and enhance plant growth and survivability. Add compost or mulch:Spread material by hand to minimize damage to plant material and keep the base of stems clear of compost or mulch. When performing extensive maintenance((e.g.,major plant changes, tree removal,utility or irrigation work),place 2-4-foot long x 6-to 8- inch wide board(s)for walking and standing on in swales,to distribute weight and avoid soil compaction.Stay on board during construction/ repairs to reduce compaction. Lay board flat on bottom of swale taking care not to damage plants. INTEGRATED PEST MANAGEMENT Follow Integrated Pest Manaement Plan and schedule for facility type. Do not apply herbicides or pesticides to the facility. Survey for presence of detrimental insects and pests SPILL PREVENTION AND RESPONSE K-1.30 Constructed Wetlands Facility Name: Facility Location: Maintenance Item I DEC I JAN I FEB I MAR I APR I MAY I JUN I JUL I AUG I SEP I OCT I NOV I Storm All sites shall implement best management practices to prevent hazardous or solid wastes or excessive oil and sediment from contaminating stormwater.Contact Spill Prevention&Citizen Response at 503-823-7180 for immediate assistance responding to spills. Record time/date,weather,and site conditions if site activities contaminate stormwater. Cleanup spills as soon as possible to prevent contamination of stormwater. PEST CONTROL If rodent holes are present,fill and compost soil around the holes. Record time/date,weather,and site conditions when vector actiivity observed. Record when vector abatement started and ended. K-1.31 Ponds Facility Name: Facility Location: Maintenance Item I DEC I JAN I FEB I MAR I APR I MAY I JUN I JUL I AUG I SEP I OCT I NOV I Storm STRUCTURAL REPAIRS Remove trash or other debris from facility and trash rack(if I I I I I I I I I 1111111111111 applicable). STORAGE SUMP DRY PONDING AREA Remove and dispose of accumulated sediment when it exceeds 10% of ponding depth or 1 foot,whichever is less. Repair or replace liner if it is visible and has more than three 1/4-inch holes in it. PONDING AREA IRRIGATION Startup irrigation system,set timer,and test system for issues Inspect irrigation system for correct operation,water coverage and/or broken lines during seasons of active use. Check irrigation lines for breaks Check valves for operation Replace damaged connections,pipe accessories Irrigate during hot,dry seasons,based on plant needs. Irrigate deeply and thoroughly,but less frequently. Flush irrigation system and winterize system;insulate live supply lines VEGETATION MANAGEMENT If tall or overgrown vegetation inerfere with facility operation,access for maintenance,traffic sight lines,or foot traffic,prune or remove vegetation. Edge and trim facility edges. Replace dead or strained vegetations per original planting plan,or substitute with approved appropriate replacement.(First 2 years) Remove fallen leaves and debris. Manually remove weeds. Remove all weedy debris. K- 1.32 Ponds Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm If noxious weeds are present,develop a management control plan to remove noxious weeds.Watch for and respond to new occurrences of especially aggressive weeds such as Himalayan blackberry,Japanese knotweed,morning glory,English ivy,reed canary grass and horsetail to avoid invasions. Check for exposed soil:cover with plants and mulch as needed. For staking and guying: (As Needed) • Repair tree stakes and guys as needed. • Remove tree stakes as soon as they are no longer needed for tree stabilization(Minimum of one year and a maximum of two years after installation). • Inspect and adjust stakes and connections to provide support,to prevent girdling of trunks or branches,and to prevent rubbing that causes bark wounds. Replenish composted mulch after weeding. Replenish mulch to a minimum 2"depth. (Tree Removal) (Tree If tree growth impeeds maintenance access,maintenance activity,or Replacement) disrupts facility function or capacity,trim or remove trees. Remove and replace, dead,diseased or dying trees. PRUNING (Cut back foliage before (Cut back dead foliage Ornamental Grasses(Perennial):If dead material from previous collapses) before new growth years'growing cycle and dead collapsed foliage are present, Leave dry emerges) foliage for winter interest.Cut it back to within several inches from the soil before new growth emerges or earlier if the foliage collapses. Ornamental Grasses(Evergreen): If dead growth is present in spring, (Cut back dead foliage (Cut back to ground or Hand rake with a small rake or fingers.Cut when grasses become too before new growth thin every 2-3 years as tall. emerges) needed) Prune Prune early blooming Prune tree suckers as Prune sap bleeder plant dormant trees and shrubs as needed. group as needed. season needed,following bloom. plant group as needed. Trees and shrubs:Pruning of trees and shrubs K-1.33 Ponds Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm Multi-stemmed shrubs:Selectively prune 1-2 large stems from center of multi-stemmed shrubs if new growth and stem color are continually desired within the landscape(e.g.dogwood and willow species).Prune only during dormant season and best just prior to bud break. GROWING/FILTER MEDIUM Identify potential erosion(by wind or water)areas and take measures to stabilze soil(e.g.facility slopes and banks). Fill gullies,lightly compact,and plant to disperse flow.Growing medium and plants should be appropriate as per original plans or substiture with approved appropriate replacement. Maintain organic matter content of soil,optimize soil moisture retention,prevent erosion,and enhance plant growth and survivability. Add compost or mulch:Spread material by hand to minimize damage to plant material and keep the base of stems clear of compost or mulch. When performing extensive maintenance((e.g.,major plant changes, tree removal,utility or irrigation work),place 2-4-foot long x 6-to 8- inch wide board(s)for walking and standing on in swales,to distribute weight and avoid soil compaction.Stay on board during construction/ repairs to reduce compaction. Lay board flat on bottom of swale taking care not to damage plants. INTEGRATED PEST MANAGEMENT Follow Integrated Pest Manaement Plan and schedule for facility type. Do not apply herbicides or pesticides to the facility. Survey for presence of detrimental insects and pests SPILL PREVENTION AND RESPONSE K-1.34 Ponds Facility Name: Facility Location: Maintenance Item DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV Storm All sites shall implement best management practices to prevent hazardous or solid wastes or excessive oil and sediment from contaminating stormwater.Contact Spill Prevention&Citizen Response at 503-823-7180 for immediate assistance responding to spills. Record time/date,weather,and site conditions if site activities contaminate stormwater. Cleanup spills as soon as possible to prevent contamination of stormwater. PEST CONTROL If rodent holes are present,fill and compost soil around the holes. Record time/date,weather,and site conditions when vector actiivity observed. Record when vector abatement started and ended. K-1.35