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Exhibit A (Scope of Work) <br />Stormwater Flow Control and Water Quality Treatment <br />Calculations <br />Consultant will design and prepare calculations for flow control and water quality <br />treatment facilities to comply with the City's Stormwater Management Manual, which is <br />defined as the as "the Washington State Department of Ecology Stormwater <br />Management Manual for Western Washington “, as defined in the Everett Municipal <br />Code (EMC) 14.28. Flow Control and Water Quality will be designed and documented <br />as required for the improvements and changes to the cover types and pollution <br />generating surfaces. <br /> Assumptions: <br />• The pavement rehabilitation on WMVD, between Pacific Ave and Terminal Ave <br />will not trigger additional water quality or flow control requirements. <br />• Flow control and water quality treatment calculations will be included in the <br />Drainage Report. <br />Pipe Conveyance Calculations <br />Consultant will prepare storm pipe conveyance capacity calculations for new pipe <br />segments associated with the project site: <br />• Design Development (60%): Prepare preliminary pipe sizing calculations, using <br />full-flow conditions with the Manning equation and the Rational Method. Final <br />Design: Finalize pipe sizing calculations which include final conveyance and <br />backwater calculations that meet the 2024 DOE SWMMWW guidelines <br />• Gutter flow and sag analysis: Prepare gutter flow and sag analysis (if low point is <br />within project limits) to make sure the flow spread is contained with the roadway <br />shoulders. <br />Assumptions: <br />• No new outfalls will be needed. The new conveyance system will tie into existing <br />storm drain systems that already lead to existing outfalls. It is further assumed <br />that these existing outfall systems have the capacity to accommodate project <br />flows. <br />• Low infiltration rates and steep slopes make infiltration infeasible and infiltration <br />BMPs will not need to be evaluated as part of the analysis. <br />• Conveyance Calculations will be included in the Drainage Report. <br />• Gutter flow and sag analysis will be included in the Drainage Report. <br />Drainage Report <br />Consultant will prepare, assemble and submit a Draft Drainage Report (60% design <br />phase) and Final Drainage Report (90%, 100%, Ad-Ready design phases). The