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Thomson Residence March 5, 2021 <br />Stormwater Site Plan Report Section V, Page 2 <br />Element 4: Install Sediment Controls <br />All stormwater runoff from disturbed areas shall pass through an appropriate sediment removal BMP <br />before leaving the construction site or prior to being discharged. Silt fence has been proposed to be <br />installed around the perimeter of the site. Pollution prevention facilities on the erosion control plan must <br />be constructed prior to or in conjunction with all clearing and grading to ensure that the transport of <br />sediment to surface waters and adjacent properties is minimized. The BMPs relevant to controlling <br />sediment on this project include: <br />Silt Fence (BMP C233) <br />Element 5: Stabilize Soils <br />Exposed and unworked soils shall be stabilized with the application of effective BMPs to prevent erosion <br />throughout the life of the project. The specific BMPs for soil stabilization that shall be used on this project <br />include: <br />Temporary and Permanent Seeding (BMP C120) <br />Mulching (BMP C121) <br />Nets and Blankets (BMP C122) <br />Plastic Covering (BMP C123) <br />Sodding (BMP C124) <br />Topsoiling/Composting (BMP C125) <br />Surface Roughening (BMP C130) <br />Dust Control (BMP C140) <br />Element 6: Protect Slopes <br />Exposed slopes shall be stabilized with BMPs found in Element 5. <br />Element 7: Protect Drain Inlets <br />Existing drain inlets along Rucker Ave, the alley and those that are made operable during construction <br />must be protected from sedimentation. Stormwater shall not enter the conveyance system without first <br />being filtered or treated to remove sediment. Inlet protection devices shall be cleaned or removed and <br />replaced when sediment has filled one-third of the available storage (or as specified by the manufacturer). <br />The specific BMPs to be used for protecting drain inlets are: <br />Storm Drain Inlet Protection (BMP C220) <br />Element 8: Stabilize Channels and Outlets <br />Conveyance channels are not located on or in the immediate vicinity of the site. <br />Element 9: Control Pollutants <br />250 4th Avenue South, Suite 200 <br />Edmonds, WA 98020 <br />ENGINEERING ph.425.778.8500 1 f.425.778.5536 <br />www.cgengi neeri ng.com <br />