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STORMWATER SITE PLAN AUGUST 5, 2022 <br />COMPASS HEALTH PHASE PAGE 4 <br />MR2: CONSTRUCTION STORMWATER POLLUTION PREVENTION <br />See Full SWPPP using the DOE Template under separate cover. <br />MR 3: WATER POLLUTION SOURCE CONTROL <br />Permanent Source Control will be as follows: <br />• S424: <br />Roof/ Building Drains at Commercial Buildings <br />• S442: <br />Labeling Storm Drain Inlets on your property. <br />• S454: <br />Preventative Maintenance; <br />• S455: <br />Spill Control; <br />• S456: <br />Employee Training. <br />• S457: <br />Inspections; <br />• S458: <br />Record Keeping; <br />MR 4: PRESERVATION OF NATURAL DRAINAGE <br />The site is in the Combined Sewer area of Everett. A separate connection is made to the sewer <br />system for the storm line for future connection to a separate storm system. <br />MR 5: ON -SITE STORMWATER MANAGEMENT <br />As the site is located in the Everett UGA and is required to meet MR's #1-9 it is required to use <br />List #2 or meet the Low Impact Development Performance Standard. List #2 is the proposed <br />method of meeting MR #S. Runoff from the different site areas is managed as follows: <br />Pavement Areas: <br />Full Dispersion: Is infeasible due to previous development. <br />Pervious Pavement: The project is nearly entirely roof area. The entry way along Broadway is in <br />till soils higher in elevation than adjacent Broadway improvements and perched <br />groundwater could cause issues with those existing improvements. <br />Bioretention: The depth of bioretention cells would place the bottom of the facility in dense till. <br />Sheetflow dispersion and Concentrated Flow Dispersion: There is no vegetation native or <br />otherwise in which to disperse runoff. <br />Roof Areas: <br />Full Dispersion: Is infeasible due to previous development. <br />Downspout Full Infiltration: Infeasible due to the site coverage and Till. <br />Bioretention: See the text for bioretention above. <br />[^�crk\Pr e".Ls`,i021v,2 —OSG Arkrom mRass He a J L iv T—K)..S�.,�'ral 7riinaoe Repo-L.dcc <br />