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Home My WebLink AboutTIC 2018-02-26 Item 2H - Discussion - Tukwila 205 Levee Certification (Flood Control)City of Tukwila Allan Ekberg, Mayor INFORMATIONAL MEMORANDUM TO: Transportation and Infrastructure Committee FROM: Henry Hash, Public Works Director BY: Ryan Larson, Senior Program Manager CC: Mayor Ekberg DATE: February 23, 2018 SUBJECT: Tukwila 205 Levee Certification Project No. 91341203, Contract No. 14-164 Tukwila Levee Rehabilitation ISSUE Provide an update on a US Army Corps (Corps) and King County Flood District (Flood District) project to repair the Tukwila 205 Levee. BACKGROUND In January 2016, staff working with the Flood District, submitted a levee rehabilitation request to the Corps. This request listed two areas along the Tukwila 205 Levee where slumping had occurred during earlier flood events. Site 1 is located near the Tukwila 205 Cutoff Levee and is approximately 120 feet in length. Site 2 is adjacent to the Mitchel Moving and Storage building. The Corps reviewed this request and determined that both sites are eligible for repair under the Corps PL -8499 Levee Rehabilitation program. The Flood District was interested in expanding the Site 2 project to include the area immediately downstream and adjacent to the Segale Properties Corporate Office building. The Corps agreed with the understanding that the Flood District would reimburse the Corps for 100% of costs for the added work. This added area was designated as Site 3. DISCUSSION The Site 1 repair is limited and will be repaired within its original footprint without setting the levee back or using a floodwall. Minor plantings will also be done at this location. The Site 2 repair was originally scoped as a setback levee requiring the purchase of the Gaco Western and Mitchel buildings, demolishing them, and then setting the levee back. The Flood District began negotiating with the two property owners but were unsuccessful in reaching an agreement. The Gaco Western Site has known petroleum contamination that will require remediation and both property owners wanted approximately twice the appraised values of the properties. Condemnation was ruled out by the Flood District due to the added time required and the need for the Corps to construct the project in 2019 or lose the emergency repair funds. Without the necessary property, the only way to repair this reach of the levee is with a floodwall due to the proximity of the existing buildings and limited existing easements. The Site 3 repair will require the use of a flood wall due to the proximity of the Segale Corporate Office building, impacts to required driveway access, and limited existing easement. FINANCIAL IMPACT Repairs conducted under the PL 84-99 program are funded at a 90% Corps to 10% local cost share. The King County Flood Control District will cover the local match for the repair of the levee. RECOMMENDATION Informational item only. No action required. attachments: Levee Rehabilitation Request Corps Conceptual Plans Sites 1, 2, and 3 W:\PW Eng1PROJECTSW DR Projects\Tukwila 2051Levee Repair Gacolinto Memo Gaco-Mitchell Update.docx 55 City of Tukwila Public Works Department - Bob Giberson, Director LEVEE REHABILITATION REQUEST FORM U.S. Army Corps of Engineers. Seat'le nistrict A=N: Emergency Management Rrarich, US Army Corps of Engineers Ms. Catherine DesJardin PO Box 3755 senttle, WA 98124 Dear Ms. DesJardin: Allan Ekherg, Mayor nate: January 13, 2016 The purpose of this letter is to request Rehnbilitation Assistance from the Corps of Engineers under Public Law 84-99 for the repair of the Tukwila 205 Levee. This levee was damaged hy flood waters during the December 2015 event. The Tukwila 205 project is Active in the Rehabilitation end Inspection Progrnm. ThP levee is located on thR nreen River And there are two areas of the levee that sustained damage. The first area is slump that is approximately 120 feet in length that hogins just UDstrearn nf the Tukwila 205 cutoff levee And xtends approximately 40 feet downstream into the levee. This damage is located af approximately Rivar Mile 16.7 on the left hank, The second area of damage is an area of scour that has exposed rock armor. It is located at river mile 15.8 nn thP left bank and is adjacent to Mitchel moving nod Storage. Public Sponsor Name: City of Tukwila Project Identification (I eves name): Tukwila 205 qpnnsnr Print nf ontact: Name: Ryan Larson Address: 6300 Southcentar Rlvd. suit100 Tukwila, WA Telephon: (206) 431-2456 Email address: ryaninrQon tUkWilnuin .gEIV I further reguest that the corps of FnoioRRrs take all necessary steps to accomplish the appropriate repairs. l It is agreed that the required items of 10Cal COODeratiOn will ha provided should the levee he eligihle for Rehabilitation Assistance under PL 84-99 and the repair work is accompliQhachy the ('.nrps f Fngjneers. I herehy norlify that the right-of-way which is reguired for aoy authorized repair work is presently available. a and this letter constitutes permission for the Government and its n gntc to enternnd use said right-of-way in undertaking authori7ed repair work. We are requesting U.S. Army Corps of Engineers (ACOE) assistance under Public 1 iw 8d-99 Program in implementing A repair project at these locations. Sincareli h IY/TZZ/7: Ryan Larson, P.E. Senior Program Manager Enclosure: Flood Protection Facility Inspection form Site photos Tukwila City Hall • 6200 Southcenter Boulevard • Tukwila, WA 98188 • 206-433-1800 • Website: TukwilaWA.gov 56 0. uJ E H ,2 0 0.. 0 +.4 0 a) a) cy)o) co lo E co 0 0 0 O z 0 z 0 0 • 0 • Z D 0 El 0 ‘,9 e, Lu ac. 0 0 0 LL 3 J 0 10 0 al Inspection Field Form 20151211 57 58 60 00* 0* 050 000 000 ono 0,10 080 oao 000 000 ono on -0 CM LLJ uJ (1) LLJ0 APPROXIMATE EASEMENTS (NOTE 5) FLOOD WALL (NOTE 2) SHORING WALL (NOTE 3) HABITAT ZONE (NOTE 4) 0 Lu (1) u) < 2 ca Lu <0 0 0 06 < 1— (DZ 0 w 0 IOL z w w -1mcr EE co w < .:z w2 w ce -Li' Z Z I— cn woo 5 0 z 1-1-11Iw z 0 _ zwm w 0 inct 550 z<1-. 0 z 0 Lii '-',,.. co z D I—. wwo E 0-1(f) Ocpz D LL _1W O _1 <CC Z=I— D 1CD▪ Z __I a < I— 1=,t N _ILIJ "*k—Im • W Eu_ zm O I— HI- Eat UJ z z w< 0 IL -'-�E O 0 Z Ca 0 I— < g 72 z Lis, _-_,. O L6-2; ▪ 0 Z - co op -woD Wo OCHm HI - 5jrnE 01- cciL_',J c -R roLl-z 0,w 1°' k 2 :A oLTI 0 _iii _1— -I <0 LL> _,(,) woil, Ow <_, F_ LLcc. wo (:) o< 1—(n< Hz Lzjo 3_°E ()12lixli 1 i 11—_,Dz wnu0mu0co 61 EASEMENTS TO BE VERIFIED WITH GROUND SURVEY.