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ARCHITECTURE STUDIO of EVERETT <br /> 1207 COLBY AVENUE-EVERETT ViA 90201 <br /> 200.031.0900 GARIN@ARCRSTODIOEVERETT.COM <br /> vegetation covers the entirety of the site. Rainwater falling on site infiltrates completely with no signs of <br /> erosion. <br /> Construction activities will include site preparation,TESC installation,brush/vegetation removal,grading <br /> and excavation. Temporary sedimentation facilities will be provided on the site during the construction of <br /> stormwater mitigation systems to assure flow rates are controlled,though this is not expected as the <br /> majority of the site work will happen during the summer months. <br /> Per our geotechnical report recommendations,we will permanently manage both roof and hard surface <br /> stormwater runoff by collecting all water and tightline to spall pad within the wetland,which will also include <br /> energy dissipation measures as necessary. <br /> Minimum Requirement#2-Construction Stormwater Pollution Prevention <br /> Please see checklist at the end of the document identifying BMPs for all 13 Elements. <br /> Minimum Requirement#3-Source Control of Pollution <br /> Single-family residences exempt per 2014 SWMMWW Volume IV. <br /> Minimum Requirement#4-Preservation of Natural Drainage Systems and Outfalls <br /> As previously stated the natural/invasive vegetation the covers the entirety of the site infiltrates complete all <br /> falling rainwater. Infiltrated rainwater dissipates towards the wetland and stream along to the north end of <br /> the site. Per the Reasonable Use Approval Letter,clearing and grading must be limited to a 65'x70'(4,550 <br /> FT2) area in the southwest corner of the site. Stormwater runoff collected from the roof and hard surfaces <br /> will be tightlined to a dispersion tee and spall pad located in the wetland,and leave the remaining site <br /> undisturbed. Remain landscaped area within the clearing and grading area will be temporarily and <br /> permanently seeded to prevent erosion and to reestablish the natural drainage pattern of the site. <br /> Minimum Requirement#5-On-site Stormwater Management <br /> We propose to employ on-site Stormwater Management BMPs as follows to retain stormwater runoff on-site <br /> to the extent feasible without causing flooding or erosion impacts: <br /> Lawn and Landscaped Areas: <br /> BMP T5.13:Post Construction Soil Quality and Depth <br /> Existing site topsoil will be stockpiled for reapplication. Stockpiled soil will be covered with weed barrier <br /> material and protected during grading/construction. Topsoil will be placed prior to planting. <br /> Combined Roof and Hard Surface: <br /> BMP T5.10B:Downspout Dispersion Systems <br /> BMP T5.11:Concentrated Flow Dispersion <br /> 2 \ 33 <br />