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1 <br /> 7.0 Erosion and Sediment Control Minimum Requirements I <br /> The purpose of this section is to describe how each of the 13 Erosion and Sediment Control <br /> Minimum Requirements has been addressed and to identify the type and location of BMPs used <br /> to satisfy the requirement. If a requirement is not applicable to the project, a reason is provided. <br /> Refer to Appendix A-4 for the Temporary Erosion and Sedimentation Control (TESC) Plan. <br /> 7.1 Preserve Vegetation/Mark Clearing Limits I <br /> Prior to beginning land disturbing activities, clearing limits will be marked with flagging, high <br /> visibility plastic,or metal fence(BMP C103). The native soil and natural vegetation shall remain <br /> in an undisturbed state to the maximum extent feasible (BMP C101). I <br /> 7.2 Establish Construction Access <br /> Two stabilized construction entrances (BMP C105)are proposed to provide access to the site. <br /> The entrance off Hardeson Road will provide access to the east side of the site, and the entrance <br /> off 75th Street SW will provide access to the north side of the site. If sediment is transported onto <br /> the road surface,the road shall be cleaned each day by shoveling or sweeping prior to washing. <br /> Sediment removal by washing alone will not be allowed. If sediment is tracked from the site,the <br /> City may require stabilization to contain the sediment or the installation of a wheel wash basin <br /> (BMP C106). Dump trucks hauling material to and from the site shall be covered by a tarp. I <br /> 7.3 Control Flow Rates <br /> A temporary sediment trap (BMP C240) is proposed to control flow rates during the clear and I <br /> grade phase of the project. Refer to Appendix D for the TESC calculations showing that the <br /> sediment trap has adequate surface area to capture sediment from the site during construction. <br /> 7.4 Install Sediment Controls I <br /> Structural control measures will be used to reduce erosion and retain sediment on the <br /> construction site. The control measures are selected to fit specific site and seasonal conditions. ' <br /> The TESC plan includes the following structural measures(see Appendix A-4): <br /> 1. Filter fabric fencing will be required around portions of the perimeter of the site to prevent 1 <br /> sediment-laden stormwater from being transported offsite and around stockpile areas. <br /> 2. Native vegetation areas will be maintained to further prevent sediment-laden stormwater <br /> from entering the roadway or adjacent properties. <br /> 3. The sediment trapping facility will be constructed as one of the first steps of grading. <br /> 4. Interceptor ditches with check dams and riprap outlet protection will be constructed to direct <br /> runoff toward the infiltration sediment pond. <br /> 7.5 Stabilize Soils ' <br /> Because source control is the most important form of erosion control, construction practices must <br /> adhere to stringent cover requirements. I <br /> More specifically, during the period of May 1 through September 30, the Contractor will not be <br /> allowed to leave soils unprotected for more than 7 days,and immediate seeding will be required <br /> for areas brought to finish grade with no further work planned for the next 30 days. Areas to be <br /> paved may be armored with crushed rock subbase in place of other stabilizing measures. The <br /> area of clearing will be limited to the amount that can be stabilized by September 30 of that year. <br /> Construction Stormwater Pollution Prevention Plan <br /> Everett 7-Eleven 4 CMOS <br /> 2180309.10 <br />