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)111060. <br /> I I <br /> AD Systems Expansion <br /> PW1709-033 Public Works Permit Comments Response <br /> November 14, 2017 <br /> improvements will be about 65% of the value of the existing. If this is the case then <br /> minimum requirements 1-9 will be required for the replaced impervious surfaces. <br /> Response:The drainage report has been revised to include construction costs provided by <br /> he contractor. Utilities such as storm drainage that are being modified in place as a result <br /> of the grading around the building are not included in the site costs as they are not an <br /> improvement required to service the building and property. <br /> b. Please provide a project cost estimate or other appropriate valuation <br /> documentation for the value determination provided in the report overview. <br /> ✓'Response:A cost breakdown has been provided with the submittal. <br /> c. As noted in the drainage report MR#5 must be applied to new and replaced hard <br /> surfaces. The drainage report must address specific infeasibility criteria for each <br /> onsite stormwater management BMP in the appropriate list included in MR#5. <br /> Based on the submitted geotechnical report it appears that most BMPs will be <br /> infeasible due to either a shallow impermeable layer with perched groundwater or <br /> lack of dispersion area. However,the report doesn't reference the geotechnical <br /> report, nor make reference to infeasibility criteria. The statements in the report <br /> about maintaining existing facilities are inadequate justification for not providing <br /> onsite stormwater managementBMPs. <br /> Response:The Storm Drainage Summary has been revised to include reference to the <br /> --� infeasibility criteria as requested. <br /> d. Please show the City of Everett Standard Drainage Notes on the plans in accordance <br /> with DCSS Section 4-2.7 <br /> Response:Standard Drainage Notes have been added on the plan. <br /> e. The project's drainage collection and conveyance system must be designed to <br /> accommodate flows from a 25-year storm event as calculated using the rational <br /> method (DCSS Section 4-2.2(1). Please verify in the report that the proposed system <br /> has adequate capacity to drain the proposed improvements. <br /> Response:The proposed drainage system is designed to accommodate 25-year storm and <br /> has adequate capacity. Conveyance analysis has been added to the report. <br /> Planning Comments (Kelsey Heyd; City of Everett Public Works Department) <br />