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Exhibit A LL <br /> g. Drainage and maintenance complaints <br /> h. Geotechnical and environmental reports with critical areas and potential environmental <br /> constraints <br /> i. Record drawings for the existing roadways, utilities, and drainage systems <br /> j. Available stormwater models <br /> k. City GIS database, parcel/ ROW/easement boundaries for the treatment site and <br /> adjacent drainage systems <br /> I. Available surveyed and LiDAR topography <br /> m. City templates and forms to be used on the project <br /> Client Responsibilities <br /> 1. Schedule City staff attendance and participation in the kickoff meeting. <br /> 2. Provide HDR with GIS digital copies of the City's drainage systems for the study area. <br /> 3. Provide materials to be reviewed in this task. <br /> Assumptions <br /> 1. Review of meeting notes and decision log will be completed within seven (7) calendar days. <br /> After this time, the notes and decision logs will be finalized and archived as part of the <br /> project record. <br /> Deliverables <br /> 1. Meeting agenda and summary meeting notes (PDF). <br /> Subtask 420 — Stormwater Conveyance Facilities Preliminary Design <br /> Objective <br /> Advance the selected conceptual-level conveyance system improvements as outlined in the <br /> Lexington Avenue and Wetmore Avenue Storm Drainage and Water Treatment Improvements <br /> Feasibility Evaluation into a preliminary 30% design. <br /> Consultant Services <br /> 1. Review the recent feasibility evaluation along with record drawings, City GIS database, <br /> ROW/easement boundaries topography, soils and prior geotechnical reports, critical areas <br /> and potential environmental constraints, and utility maps and locates. <br /> 2. Develop preliminary conveyance system pipe design that includes: <br /> a. Conveyance system alignment, system connection and disconnection points, and <br /> recommended crossing locations. <br /> b. Preparation of pipe material design calculations to determine pipe material and thickness <br /> (HS25 Load) and trench backfill requirements, and to resist buoyancy forces. <br /> c. Providing pipe sizing and design recommendations using InfoSWMM . Hydrologic <br /> modeling of the tributary drainage areas will be performed using Western Washington <br /> Hydrology Model (WWHM). The model will be developed using the methodologies <br /> outline in the Stormwater Management Manual for Western Washington. <br /> Lexington Avenue Storm Drainage Improvements Preliminary Design Scope of Services <br /> 12 <br />