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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br />11 <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 or geotextile bags every 3 to 6 feet along seams and pound a , <br />wooden stake through each to hold them in place <br />g. Inspect 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 Standards <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-term 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 lime and fertilizer 1 to 2 inches into the soil, and smooth the surface. <br />Volume 11— Construction Stormwater Pollution Prevention <br />3-19 <br />