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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> c. Minimum of 8-inch overlap at seams <br /> d. On long or wide slopes, or slopes subject to wind, all seams should be taped <br /> e. Place plastic into a small(12-inch wide by 6-inch deep) slot trench at the top of the slope <br /> and backfill with soil to keep water from flowing underneath <br /> f. Place sand filled burlap ar geotextile bags every 3 to 6 feet along seams and pound a <br /> wooden stake through each to hold them in place <br /> g. Tnspect plastic for rips,tears, and open seams regularly and repair immediately. This <br /> prevents high velocity runoff from contacting bare soil which causes extreme erosion <br /> h. Sandbags may be lowered into place tied to ropes. However, all sandbags must be <br /> - staked in place. <br /> - Maintenance Sfandards <br /> ' 1. Torn sheets must be replaced and open seams repaired <br /> 2. If the plastic begins to deteriorate due to ultraviolet radiation,it must be completely removed and <br /> replaced <br /> 3. When the plastic is no longer needed,it shall be completely removed. <br /> 3.2.11 BMP C124: Sodding <br /> Purpose <br /> The purpose of sodding is to establish permanent turf for immediate erosion protection and to stabilize <br /> drainage ways where concentrated overland flow will occur. <br /> Conditions of Use <br /> Sodding may be used in the following areas: <br /> • Disturbed areas that require short-tertn or long-term cover <br /> • Disturbed areas that require immediate vegetative cover <br /> � All waterways that require vegetative lining. Waterways may also be seeded rather than sodded, <br /> and protected with a net or blanket. <br /> Design and Installation Specifications <br /> - Sod shall be free of weeds, of uniform thickness(approximately 1-inch thick), and shall have a dense root <br /> mat for mechanical strength. <br /> . The following steps are recommended for sod installation: <br /> 1. Shape and smooth the surface to final grade in accordance with the approved grading plan. The <br /> swale needs to be over-excavated 4 to 6 inches below design elevation to allow room for placing <br /> soil amendment and sod. <br /> 2. Amend 4 inches(minimum) of compost into the top 8 inches of the soil if the organic content of <br /> the soil is less than 10 percent or the permeability is less than 0.6 inches per hour. Compost used <br /> should meet Ecology publication 94-038 specifications for Grade A quality compost. <br /> 3. Fertilize according to the supplier's recommendations. <br /> 4. Work liine and fertilizer 1 to 2 inches into the soil, and smooth the surface. <br /> Volume 11— Construction Stormwater Pollution Prevention <br /> 3-19 <br />