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• During the wet season on slopes steeper than 3H:1 V with more than <br />10 feet of vertical relief. <br />Mulch may be applied at any time of the year and must be refreshed <br />periodically. <br />• For seeded areas mulch may be made up of 100 percent: cottonseed <br />meal; fibers made of wood, recycled cellulose, hemp, kenaf, compost; <br />or blends of these. Tackifier shall be plant -based, such as guar or alpha <br />plantago, or chemical -based such as polyacrylamide or polymers. Any <br />mulch or tackifier product used shall be installed per manufacturer's <br />instructions. Generally, mulches come in 40-50 pound bags. Seed and <br />fertilizer are added at time of application. <br />Design and For mulch materials, application rates, and specifications, see Table 4.1.8. <br />Installation Always use a 2-inch minimum mulch thickness; increase the thickness <br />Specifications until the ground is 95% covered (i.e. not visible under the mulch layer). <br />Note: Thickness may be increased for disturbed areas in or near sensitive <br />areas or other areas highly susceptible to erosion. <br />Where the option of "Compost" is selected, it should be a coarse compost <br />that meets the following size gradations when tested in accordance with <br />the U.S. Composting Council "Test Methods for the Examination of <br />Compost and Composting" (TMECC) Test Method 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 V sieve openings 70% <br />Minimum Percent passing '/4" sieve openings 40% <br />Mulch used within the ordinary high-water mark of surface waters should <br />be selected to minimize potential flotation of organic matter. Composted <br />organic materials have higher specific gravities (densities) than straw, <br />wood, or chipped material. Consult Hydraulic Permit Authority (HPA) for <br />mulch mixes if applicable. <br />Maintenance • The thickness of the cover must be maintained. <br />Standards • Any areas that experience erosion shall be remulched and/or protected <br />with a net or blanket. If the erosion problem is drainage related, then <br />the problem shall be fixed and the eroded area remulched. <br />Volume II — Construction Stormwater Pollution Prevention - December 2014 <br />4-20 <br />