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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 C 1.21: Mulching 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 overcome 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 1- 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 />800-1000 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 />• <br />Volume II — Construction Stormwater Pollution Prevention - August 2012 <br />4-14 <br />