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2019 SWMMWW MINIMUM REQUIREMENTS SUMMARY <br /> MR : MINIMUM REQUIREMENT <br /> SSP : STORMWATER SITE PLAN <br /> MR#1 PREPARATION OF STORMWATER SITE PLAN: <br /> Stormwater site plan follows the 2019 SWMMWW and the City of Everett 2021 Design <br /> and Construction Standards. <br /> MR #2 CONSTRUCTION OF STORMWATER POLLUTION PREVENTION <br /> PLAN(SWPPP): <br /> Refer to section IV for the SWPPP. <br /> MR#3 SOURCE CONTROL OF POLLUTION: <br /> NA. No source control pollutants pertain to the proposed project, therefore no BMPs are <br /> required for the proposed project. <br /> MR #4 PRESERVATION OF NATURAL DRAINAGE SYSTEMS AND <br /> OUTFALLS: <br /> The developed site drainage will be discharged into the existing combined sewer system <br /> that drains to the south within a closed pipe system to follow its natural drainage path. <br /> MR#5 ONSITE STORMWATER MANAGEMENT: <br /> For onsite stormwater management (MR#5) list # 2 was used per Vol 1 section 2.5.5 of the <br /> SWMMWW. Full dispersion was considered first however it was deemed infeasible due to <br /> the lack of native vegetation. Downspout full infiltration was deemed infeasible due to the <br /> presence of iron oxide deposits at shallow depths, indicating poor infiltrating soils and a <br /> shallow low permeable layer. Please refer to the Geotechnical Report for more details. <br /> Bioretention was deemed infeasible as the site lacks the necessary area to accommodate <br /> infiltration facilities within the required setbacks. Downspout Dispersion is infeasible <br /> because the site cannot provide the required vegetated flow paths. Perforated stub out <br /> connections are also not feasible due to the iron oxide deposits found at shallow depths. <br /> The runoff from the roof will be tight lined to a detention system on the east side of the <br /> project to continue to the City's combined sewer system. <br /> Insight Engineering Co. -Stormwater Site Plan 3/25/2021 <br /> -6- <br />