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2 <br />0 <br />U <br />U' <br />z <br />w <br />m <br />U) <br />0 <br />co <br />oo <br />w <br />w <br />F- <br />U) <br />w <br />00 <br />wsb <br />February 24, 2022 <br />Mr. Michael Grochala <br />Community Development Director <br />City of Lino Lakes <br />600 Town Center Parkway <br />Lino Lakes, MN 55014-1182 <br />Re: Scope of Work — Shenandoah Park Stormwater Quality BMP Feasibility Study <br />Dear Mr. Grochala: <br />WSB is pleased to provide this scope of work and cost estimate to complete a stormwater quality <br />BMP feasibility study for Shenandoah Park. The goal of the study will be to determine the <br />feasibility of implementing various stormwater improvements to the existing ditch and drained <br />wetland area to 1) improve water quality in downstream Rice Lake, 2) enhance the recreational <br />amenities and educational opportunities within the park and 3) restore and rehabilitate the park <br />vegetation. <br />SCOPE OF WORK <br />Task 1: Conceptual Designs Cost: $4,961 <br />WSB will develop schematics for three conceptual -level design options based on discussions with <br />City staff and using currently available electronic data including storm sewer system GIS <br />information and as-builts, LiDAR contour data, and the previously completed wetland delineation. <br />Each design will also include vegetation rehabilitation concepts. One design will be based on the <br />stormwater wetland concept developed for Shenandoah Park in the 2010 Rice Lake <br />Subwatershed Stormwater Retrofit Assessment (RLSSR Assessment). At least one other design <br />concept will incorporate re -meandering of drainage ditch. <br />Deliverable(s): Conceptual -level GIS figures for three design options. <br />Task 2: Develop H&H Model Cost: $5,582 <br />An XP-SWMM model will be developed for the drainage area upstream of the culvert crossing at <br />Birch Street to estimate the impacts to area flood risk and channel hydraulics of the three <br />conceptual designs developed in Task 1 compared to existing conditions. The XP-SWMM model <br />will be based on currently available electronic information (LiDAR data, storm sewer as-builts, <br />and drainage areas from SWAMP). WSB will coordinate with RCWD to ensure the model can be <br />input into RCWD's District -wide model and complies with RCWD's Hydrologic and Hydraulic <br />Modeling Guidelines (HHMG) dated February 23rd, 2022. This coordination will include "edge - <br />matching" drainage areas to the RCWD URC (Direct Drainage) boundary per the Catchment <br />Boundary instructions in the HHMG. In addition, WSB will perform one field visit to measure <br />existing ditch depth, dimensions and estimate longitudinal slope. <br />Deliverable(s): Existing and proposed XP-SWMM models for three design options. Shapefile(s) <br />with subcatchment boundaries and runoff parameters. <br />GA.Clients All\Lino Lakes\Proposals\Shanendoah Park\Phase 2\Proposa1_ShenandoahBMP_Phase2_022422final.docx <br />