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1 <br />Installation without mobilizing special equipment. <br />. Installation by anyone with minimal training <br />Installation in stages or phases as the project progresses. <br />. Installers can hand place seed and fertilizer as they progress down the slope. <br />. Installation in any weather. <br />. There are numerous types of blankets that can be designed with various para- <br />meters in mind. Those parameters include: fiber blend, mesh strength, longevity, <br />biodegradability, cost, and availability. <br />Design and Installation Specifications <br />• See Figure II-4.1.3 Channel Installation (p.292) and Figure II-4.1.4 Slope Install- <br />ation (p.293) for typical orientation and installation of blankets used in channels <br />and as slope protection. Note: these are typical only; all blankets must be installed <br />manufacturer's installation instructions. <br />per <br />. Installation is critical to the effectiveness of these products. If good ground contact <br />is not achieved, runoff can concentrate under the product, resulting in significant <br />erosion. <br />. Installation of Blankets on Slopes: <br />1. Complete final grade and track walk up and down the slope. <br />2. Install hydromulch with seed and fertilizer. <br />3. Dig a small trench, approximately 12 inches wide by 6 inches deep along the <br />top of the slope. <br />4. Install the leading edge of the blanket into the small trench and staple approx- <br />imately every 18 inches. NOTE: Staples are metal, "U"-shaped, and a min- <br />imum of 6 inches long. Longer staples are used in sandy soils. <br />Biodegradable stakes are also available. <br />5. Roll the blanket slowly down the slope as installer walks backwards. NOTE: <br />The blanket rests against the installer's legs. Staples are installed as the <br />blanket is unrolled. It is critical that the proper staple pattern is used for the <br />blanket being installed. The blanket is not to be allowed to roll down the <br />slope on its own as this stretches the blanket making it impossible to main- <br />tain soil contact. In addition, no one is allowed to walk on the blanket after it <br />is in <br />place. <br />6. If the blanket is not long enough to cover the entire slope length, the trailing <br />edge of the upper blanket should overlap the leading edge of the lower <br />1 <br />2014 Stormwater Management Manual for Western Washington <br />Volume 11 - Chapter 4 - Page 289 <br />