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. For less than 30 days on disturbed areas that require cover. <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:1V 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 11-4.1.8 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-B. <br /> Coarse Compost <br /> Minimum Percent passing 3"sieve openings 100% <br /> Minimum Percent passing 1"sieve openings 90% <br /> Minimum Percent passing 3/4"sieve openings 70% <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 Western Washington <br /> Volume 11-Chapter 4 -Page 285 <br />