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Supplemental Staff Memo 07-20-21 fm W-Farley-Engineering PCPH 07-26-21 LU 21-0019 / '1. MEMORANDUM war o oREGOta TO: Lake Oswego Planning Commission CC: Scot Siegel, Planning & Building Services Director Erica Rooney, City Engineer FROM: Will Farley, P.E. City Traffic Engineer SUBJECT: LU 21-0019 Boones Ferry Road Staging Area CDC and Map Amendments DATE: July 20, 2021 Engineering staff have reviewed the proposed amendments to the Community Development Code, the Comprehensive Plan Map, and the Zoning Map to allow multifamily housing as a permitted use on the Boones Ferry Road Construction Staging Property located on the southwest corner of Boones Ferry Road at West Sunset Drive. Reasonable Worst-Case Development Scenario At the request of City staff, a third-party consultant prepared a memorandum that documented the potential vehicle trip generation for reasonable worst-case development scenarios under existing conditions as well as following the proposed amendments. Under the existing West Lake Grove—Office Commercial (WLG-OC) zoning, the consultant determined that the proposed site could reasonably contain either a day care center or high-turnover restaurant. Taking in consideration that the property is located along a Major Arterial roadway in a commercial area with nearby residential and office uses, staff agreed with the consultant's assumptions for the reasonable worst-case development scenario under the existing zoning. These existing potential uses were compared to the expected traffic intensity of an assumed 54-unit multifamily housing development that could occupy the site following the proposed zoning amendments. Based on this comparison, it was concluded that the amendments would not result in an increase in the potential trip generation of the property and therefore would not result in a significant effect to the planned transportation system. Under the State Transportation Planning Rule (OAR 660-012-0060) and the City's Comprehensive Plan (Connected Community Chapter), if the amendments resulted in an increase in potential traffic and were anticipated to have a significant effect on the 503.675.3984 380 A Avenue PO BOX 369 Lake Oswego, OR 97034 www.ci.oswego.or.us Page 2 of 4 transportation system, the remedy would be to either deny the zone change, limit the scope of the amendments (for example, with a trip cap on future development), or to apply other mitigation. Requiring a Traffic Impact Study Traffic Impact Studies assist the City in ensuring existing and proposed transportation facilities in the vicinity of the proposed land-use action are capable of accommodating the amount of traffic expected to be generated by a proposed development. These studies also provide the City an opportunity to implement the City's Comprehensive Plan and Transportation System Plan. Criteria for the requirement of a Traffic Impact Study are identified in Section 50.07.003.1.iii.(2) of the City's Community Development Code and are quoted below in italics with a response immediately following. (2) The City Engineer shall require a traffic impact study when any of the following conditions are met: (a) The proposed development or site modification will generate at least 25 trips in the roadway peak hour traffic period or at least 250 daily trips, prior to applying trip reduction factors; or Response:The proposal consists of an amendment to the Community Development Code, the Comprehensive Plan Map, and the Zoning Map. No development or site modification is being proposed at this time. Accordingly, this condition is not triggered. It should be noted that any future development on the site will need to be approved through a land-use process and may trigger this criterion, at which time a study that evaluates that project's specific impacts will be required. (b) The site is subject to a Zoning Map or text amendment or Comprehensive Plan or Map amendment that increases the intensity(potential vehicle trip generation) of allowed uses; or Response: Based on the findings from the consultant's Zone Change Transportation Assessment dated April 27th, 2021, the proposed amendments are not projected to increase the potential vehicle trip generation of the site. Accordingly, this condition is not triggered. (c) The daily use of the property increases by ten or more vehicles with a gross vehicle weight rating of 26,000 pounds or greater; or Response: The daily use of the property by heavy vehicles is not expected to increase prior to any development. Accordingly, this condition is not triggered. With any future development application, Engineering would determine if the proposal triggers this criterion and, if so, would require a Traffic Impact Study. Page 3 of 4 (d) The traffic generated by a proposed development will result in a traffic volume increase that could potentially change the functional classification of an existing or planned transportation facility(e.g., traffic volume exceeds local street classification; or Response:The current proposal is amending the permitted uses on the subject site and no development is being proposed. Accordingly, this condition is not triggered. With any future development application, Engineering would determine if the proposal triggers this criterion and, if so, would require a Traffic Impact Study. (e) The City Engineer finds: (i) The City or other roadway authority has documented traffic safety or operations concerns within the study area, such as frequent crashes, poor roadway alignment, limited sight distance; or Response: No nearby traffic safety or operations concerns with West Sunset Drive or the other adjacent roadways have been documented in previous studies. Recent crash history and frontage improvements will be reviewed and a traffic study may be required at time of a development application. Accordingly, this condition is not triggered. (ii) Existing level of service of a nearby intersection is at or below LOS "DU or Response: Per the City's Transportation System Plan, the operation of nearby intersections has been reported at LOS "C" or better. Accordingly, this condition is not triggered. With any future development application, Engineering would determine if the proposal triggers this criterion and, if so, would require a Traffic Impact Study. (iii) A proposed development is expected to alter traffic patterns on a local street or neighborhood collector within one-half mile of the subject lot such that access to individual properties or traffic safety is adversely impacted; or Response:The current proposal is amending the permitted uses on the subject site and no development is being proposed. Accordingly, this condition is not triggered. With any future development application, Engineering would determine if the proposal triggers this criterion and, if so, would require a Traffic Impact Study. (iv) The site lies within one-quarter mile of the ramp terminal of an interstate freeway, as traveled along roadways. Response:The site does not fall within on-quarter mile of any ramp terminals to the interstate freeway. Accordingly, this condition is not triggered. Page 4 of 4 None of the criteria from LOC 50.07.003.1.iii.(2) (Traffic Impact Study requirements) were triggered for the proposed amendments to the Community Development Code or the amendments to the Comprehensive Plan and Zoning Maps. Engineering staff concluded that a Traffic Impact Study was not required. Once a development is proposed on the subject property and begins the land-use process, Engineering staff will review potential impacts to determine if a study of traffic conditions is needed.