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City of Everett Point Industrial Center (EPIC) Bridge Project – Phase 2 Full Design <br /> <br /> Page 22 of 43 <br /> <br /> Once the Agency has reviewed the Draft Drainage Report with Draft water quality <br />treatment calculations, the water quality treatment calculations will be updated as <br />necessary for inclusion in the Final Drainage Report. <br />Deliverables: <br />Draft water quality treatment calculations (to be included in the Drainage Report). <br />Final water quality treatment calculations (to be included in the Drainage Report). <br />Pipe Conveyance Calculations <br />Perteet will prepare storm pipe conveyance capacity calculations for new pipe segments <br />associated with the Project site: <br /> Design Development (60%): Prepare preliminary pipe sizing calculations, using full-flow <br />conditions with the Manning equation and the Rational Method. <br /> Final design: Finalize pipe sizing calculations <br />Gutter flow and sag analysis: Prepare gutter flow and sag analysis (if low point is within <br />Project limits) to make sure the flow spread is contained with the roadway shoulders. <br /> <br />Assumptions: <br /> No new outfalls will be needed. The new conveyance system will tie into existing storm <br />drain systems that already lead to existing outfalls. It is further assumed that these <br />existing outfall systems have the capacity to accommodate Project flows. <br /> <br />Deliverables: <br /> Conveyance Calculations (to be included in the Drainage Report) <br /> Gutter flow analysis (to be included in the Drainage Report) <br /> <br />Drainage Report <br />Perteet will assemble a draft drainage report (60% design phase) and final drainage report (90% <br />design phase). The drainage report will include a written assessment and summary of the surface <br />water design features on the Project, summary of tables, water quality treatment calculations, <br />pipe capacity calculations, drainage basin maps, backwater analysis (Hydraulic Grade Line), and <br />supporting exhibits. <br /> <br />Deliverables: <br /> Draft Drainage Report at 60% PS&E phase (electronic PDF copy) <br /> Final Drainage Report at 90% PS&E phase (electronic PDF copy) <br /> <br />Coordination with Everett Projects <br />Perteet will coordinate with the AGENCY on its outfall and water quality improvement projects <br />in the Project vicinity. Perteet understands the downstream system at the base of the proposed <br />bridge will be upsized due to a capacity deficiency documented in the AGENCY’s stormwater <br />comprehensive plan. In addition, the AGENCY plans to install a regional water quality facility in <br />the vicinity of the reconstructed outfall. This work will include electronic and telephone