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• Confirm the installation of all required surface water control measures <br /> to prevent seed from washing away. <br /> • Hydroseed applications shall include a minimum of 1,500 pounds per <br /> acre of mulch with 3 percent tackifier. See BMP C121: Mulchinu for <br /> specifications. <br /> • Areas that will have seeding only and not landscaping may need <br /> compost or meal-based mulch included in the hydroseed in order to <br /> establish vegetation. Re-install native topsoil on the disturbed soil <br /> surface before application. <br /> • When installing seed via hydroseeding operations, only about 1/3 of <br /> the seed actually ends up in contact with the soil surface. This reduces <br /> the ability to establish a good stand of grass quickly. To overcoane this, <br /> consider increasing seed quantities by up to 50 percent. <br /> • Enhance vegetation establishment by dividing the hydromulch <br /> operation into two phases: <br /> 1. Phase I- Install all seed and fertilizer with 25-30 percent mulch <br /> and tackifier onto soil in the first lift. <br /> 2. Phase 2- Install the rest of the mulch and tackifier over the first lift. <br /> Or,enhance vegetation by: <br /> 1. Installing the mulch, seed, fertilizer, and tackifier in one lift. <br /> 2. Spread or blow straw over the top of the hydromulch at a rate of <br /> 500-1000 pounds per acre. <br /> 3. Hold straw in place with a standard tackifier. <br /> Both of these approaches will increase cost moderately but will greatly <br /> improve and enhance vegetative establishment. The increased cost <br /> may be offset by the reduced need for: <br /> • Irrigation. <br /> • Reapplication of mulch. <br /> • Repair of failed slope surfaces. <br /> This technique works with standard hydromulch(1,500 pounds per <br /> acre minimum) and BFM/MBFMs(3,000 pounds per acre minimum). <br /> • Seed may be installed by hand if: <br /> • Temporary and covered by straw, mulch,or topsoil. <br /> • Permanent in small areas (usually less than 1 acre) and covered <br /> with mulch, topsoil, or erosion blankets. <br /> • The seed mixes listed in the tables below include recommended mixes <br /> for both temporary and permanent seeding. <br /> Volume II—Construction SlormlVater Pollution Pr(n enlion-Augusl 2012 <br /> 4-14 <br />