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PENSKE TRUCK LEASING EVERETT ONSITE IMPROVEMENTS <br />CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN <br />Sitts & Hill Engineers, Inc. <br />Job Number 17,710 <br />• Storm drain inlets shall be protected to prevent sediment -laden water entering the <br />storm drain system (see BMP C220: Storm Drain Inlet Protection (p.357)). <br />Maintenance Standards <br />Inspect stabilized areas regularly, especially after large storm events. <br />Crushed rock, gravel base, etc., shall be added as required to maintain a stable driving <br />surface and to stabilize any areas that have eroded. <br />Following construction, these areas shall be restored to pre -construction condition or bet- <br />ter to prevent future erosion. <br />Perform street cleaning at the end of each day or more often if necessary. <br />BMP C120: Temporary and Permanent Seeding <br />Purpose <br />Seeding reduces erosion by stabilizing exposed soils. A well -established vegetative <br />cover is one of the most effective methods of reducing erosion. <br />Conditions of Use <br />Use seeding throughout the project on disturbed areas that have reached final grade or <br />that will remain unworked for more than 30 days. <br />The optimum seeding windows for western Washington are April 1 through June 30 and <br />September 1 through October 1. <br />Between July 1 and August 30 seeding requires irrigation until 75 percent grass cover is <br />established. <br />Between October 1 and March 30 seeding requires a cover of mulch with straw or an <br />erosion control blanket until 75 percent grass cover is established. <br />Review all disturbed areas in late August to early September and complete all seeding <br />by the end of September. Otherwise, vegetation will not establish itself enough to <br />provide more than average protection. <br />. Mulch is required at all times for seeding because it protects seeds from heat, mois- <br />ture loss, and transport due to runoff. Mulch can be applied on top of the seed or <br />simultaneously by hydroseeding. See BMP C121: Mulching (p.284) for spe- <br />cifications. <br />. Seed and mulch, all disturbed areas not otherwise vegetated at final site sta- <br />bilization. Final stabilization means the completion of all soil disturbing activities at <br />the site and the establishment of a permanent vegetative cover, or equivalent per- <br />2014 Stonnwater Management Manual for Westem Washington <br />Volume ll - Chapter 4 - Page 278 <br />SITTS & HILL ENGINEERS, INC. 28 <br />TACOMA, WASHINGTON <br />