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Agenda Item - 2021-12-21 - Number 5.3 - Presentation - North Shore Bridge Retaining Wall Repair E9I EO PUBLIC WORKS t C.) 1 \\OO) � NORTH SHORE ROAD BRIDGE RETAINING WALL REPAIR DECEMBER 21 , 2 0 2 1 Agenda • Background • Evaluation • Alternatives • Permitting • Schedule • Recommendation IC`lA E=Os fi U �� O Background • • tounfrv.. 'r•-- '-.'-'4/ - '-- --...?, I ..aaftligt,awl* , . :,..._ f °.'''' - . IS -1 3- i--1,-LE:1-' i [iii_LFT--\1 f5'4.-..- 4-m4;..-",..-----Ri''' . . _1_14"....---a in ' '..1144,t400;g:i•,,,i1.....1---i',6 iftiglas I ' 4111111111110a . MN' • •- 1 .------_ ' °111.1011r Ala i 1....f•-•------ 1 , .. . ...,. .. .._••„./Trim/.........• 111.111 NW - --- --'. . •411111111/ int:it- aIl+Z- :•.:•'':.'..7".•••-• • •'• 'N ....iMmi unit ..i.--,-- 11110-r•1011174,1Mlig .ft.: _ / Eva 4 .-_. 1,...-6,„,i, .mi ,„„ , •, ..:,.- -,,, . MI"'Nme7 _.....(\ 010011,- • . ',--3 ''.k ,---Allif Jiff • ....•4 .;. 1:.:Iii. .' 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LAKEWOOD B/ G / _. 8- \\IOC �.,-- COMMUNITYASTiv cb t,12/1/000, C l cr.;:,.., _ 68,, '5 �!i a r ROAD CLOSED- 0 sz,°re R ' _ '� AHEAD �' _ ,, ROAD LOCAL TRAFFIC ONLY � CLOSED ROAD CLOSED 0��p � Q Q *. NORTH LAKE '1.• 1-rep Q.) CO \ EASEMENT • Oswego Lake --"Ico ��o ROAD CLOSED ' ..�` AHEAD �Q�._ -± Cry LOCAL TRAFFIC ONLY CC SOUTH VIEW CLUB #2 co 4, 316 ;3°� EASEMENT �- 1}/° co A, s ,.r'a L2r 4- ry Or-� kn 21 f 0 - 1 t - o 46" c rot 0, } y ro j0a , CL' . :W-__ to o Ph i] _ 0_ r? —- m e n rn Q o Evaluation • Consultant performed Slope Stability Analysis. • Current wall has a Factor of Safety of 1 . 1 due to height and slope of wall . • Minimum Factor of Safety is 1 . 5 . • Repair or replacement is not structurally viable . I041A E O\ tfi U , 0REG�� Alternatives • Solution Needs to be a MSE type wall system . • Estimated total project cost $ 1M - $ 1 . 25M • Expected to use ARPA Funding. it 1.. ..e,„,.., _.. ..,,...„-„..... _ i l , . 7 {{ . „,. _,,., , , .. .. .. ...,.,„ .,..r ,..„,.,,„,.„,„-.....„...__,._,. , ........ , ... . .. .. • , . . .„ ,. , , -______, ,,:„.•:_,..„,• ,...,,..,...,, p::._ • - ' 7 #W,''''.01_1"- ..-•;.•7. -:.,'.:,—. iffil*ilTai Tir- 1-aiki .', ..,.,,!_....--./... -..'„i„;,_.?rti. . • A''4V.... .:.-.i.,,4•;X:g.,..T. . . / :.4. 7 + -' -. e f + ails yi 7l ,. , .. V l ra j ,• .'£•dr`+ ,, -i — ------- I'' y :14-.4 .� ., 011 I ' - E4 ffiiravo 5. . r.- . . i,-,- - 4":7_;:74 I:. .':.-tirlkol. -: T.. .11,.;;IIIIVIO00-.."'"."1___,.r____-- •,----- _.(11 , {I lift' ;r " F„._ Alternatives • NE Wall requires tieback anchors. • Length of tiebacks extends into NW wall . • Requires both walls to be replaced . r i , : :, ,. III !�' R NE Retaining Wall 16t. Tieback Anchors NW Retaining Wall 1 1 It Permitting • Work in Oswego Lake subject to DSL & ODFW permitting. • Replacement of failing wall is "Emergency Reconstruction of Transportation Structure" and thus exempt. • Replacement of other walls would require full • ermit review ( 12- 18 months) . IOC`lA � Os z \ fi \�REG� / Schedule Discovery & Closure July 2021 Design & Construction Contracts September 2021 Geotech & Structural Analysis November 2021 Finalize Design January 2022 Construction Starts February 2022 Construction Complete May 2022 Schedule Variables �04,,� � o�fi • Solicit public feedback: +3 months � o • Material availability: tbd \�REG� / Resolution 21-41 I Recommendation • Section 1. The NE and NW retaining walls of the North Shore Road Bridge approach be replaced with Lock+Load MSE walls, or similar. • Section 2. The City Manager amend the public improvement contracts with DOWL and Emery & Sons to construct designed walls. • Section 3. The Northshore Road bridge shall be reopened to vehicular traffic upon completion of the replacement retaining walls. • Section 4. Effective Date. This Resolution shall take effect upon passage. -44 r iE� rl f iiilj�ltfti of • AlAik C.) 0 • . f • ._ ko k REG Questions ? 0 V .• 0 -REGD