Laserfiche WebLink
INTERWEST — EVERETT CONTRACTOR'S YARD INTERIM FILL PROJECT Sitts & Hill Engineers, Inc. <br />CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN Job Number 17,733 <br />Section 7 — Construction Stormwater Pollution Prevention Elements <br />Erosion and sediment control for this project will consist of the application of the BMPs described in this <br />section. See the Erosion Control Plan exhibit at the end of this section for a plan view of the proposed <br />TESC best management practices (BMPs). <br />Below is a discussion of each of the thirteen Construction Stormwater Pollution Prevention Elements <br />and a summary of applicable BMPs. Design, installation, and maintenance of any specific BMP should be <br />carried out in accordance with the DOE Manual and any further instructions detailed in the construction <br />plans. Included in Appendix A of this report are the DOE Manual specifications, tables, and figures for <br />each BMP identified in this report. <br />Element 1- Preserve Vegetation/Mark Clearing Limits <br />Work limits will be identified in the field from the construction plans. Silt fence will be used to delineate <br />' the limits of construction. Existing vegetation should be preserved where possible to limit the area of <br />exposed soils. <br />I <br />Applicable BMPs: BMP C101: Preserving Natural Vegetation <br />BMP C233: Silt Fence <br />' Element 2- Establish Construction Access <br />' Two stabilized construction entrances are proposed - one on the southwest corner of the site, and the <br />other on the southeast corner. Any debris generated as a result of construction activity will be swept <br />clean to prevent tracking onto paved areas. <br />' Applicable BMPs: BMP C105: Stabilized Construction Entrance / Exit <br />r <br />Element 3- Control Flow Rates <br />The proposed site fill will provide more soil retention of stormwater than the existing site surfaces. In <br />this way, the discharge of runoff from the project site will not increase due to the placement of fill. See <br />Appendix B for a geotechnical report describing existing site surface soils as fill material of variable <br />composition, including very loose to very dense gravel, sand, sawdust, concrete, and wood. Standing <br />water is observed on the project site during periods of rainfall. The proposed fill material is recycled <br />concrete. A sieve analysis of the material (see Appendix C) indicates a coarse material with 73.7% gravel <br />and 23.3% sand. <br />Applicable BMPs: N/A <br />SITTS & HILL ENGINEERS, INC. 15 <br />TACOMA, WASHINGTON <br />