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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />PENSKE TRUCK LEASING EVERETT ONSITE IMPROVEMENTS <br />CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN <br />- For less than 30 days on disturbed areas that require cover. <br />Sitts & Hill Engineers, Inc. <br />Job Number 17,710 <br />. At all times for seeded areas, especially during the wet season and during the hot <br />summer months. <br />. During the wet season on slopes steeper than 3H:1 V with more than 10 feet of ver- <br />tical relief. <br />Mulch may be applied at any time of the year and must be refreshed periodically. <br />. For seeded areas mulch may be made up of 100 percent: cottonseed meal; fibers <br />made of wood, recycled cellulose, hemp, kenaf; compost; or blends of these. Tack- <br />ifier shall be plant -based, such as guar or alpha plantago, or chemical -based such <br />as polyacrylamide or polymers. Any mulch or tackifier product used shall be <br />installed per manufacturer's instructions. Generally, mulches come in 40-50 pound <br />bags. Seed and fertilizer are added at time of application. <br />Design and Installation Specifications <br />For mulch materials, application rates, and specifications, see Table II4.1.8 Mulch <br />Standards and Guidelines (P.286). Always use a 2-inch minimum mulch thickness; <br />increase the thickness until the ground is 95% covered (i.e. not visible under the mulch <br />layer). Note: Thickness may be increased for disturbed areas in or near sensitive areas <br />or other areas highly susceptible to erosion. <br />Where the option of "Compost" is selected, it should be a coarse compost that meets the <br />following size gradations when tested in accordance with the U.S. Composting Council <br />"Test Methods for the Examination of Compost and Composting" (TMECC) Test Method <br />02.02-8. <br />Coarse Compost <br />Minimum Percent passing 3" sieve openings 100% <br />Minimum Percent passing 1" sieve openings 90% <br />Minimum Percent 70% <br />passing'/." sieve openings <br />Minimum Percent passing'/." sieve openings 40% <br />Mulch used within the ordinary high-water mark of surface waters should be selected to <br />minimize potential flotation of organic matter. Composted organic materials have higher <br />specific gravities (densities) than straw, wood, or chipped material. Consult Hydraulic <br />Permit Authority (HPA) for mulch mixes if applicable. <br />Maintenance Standards <br />- The thickness of the cover must be maintained. <br />- Any areas that experience erosion shall be remulched and/or protected with a net <br />2014 Stormwater Management Manual for Westem Washington <br />Volume ll - Chapter 4 - Page 285 <br />SITTS & HILL ENGINEERS, INC. 35 <br />TACOMA, WASHINGTON <br />