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• <br /> BMP C123: Plastic Covering <br /> Purpose Plastic covering provides immediate,short-term erosion protection to <br /> slopes and disturbed areas. <br /> Conditions of • . Plastic covering may be used on disturbed areas that require cover <br /> Use measures for less.than 30 days,except as stated below. <br /> • Plastic is particularly useful for protecting cut and fill slopes and <br /> stockpiles. Note:The relatively rapid breakdown of most polyethylene <br /> sheeting makes it unsuitable for long-term(greater than six months) <br /> • <br /> applications. <br /> • Clear plastic sheeting can be used over newly-seeded areas to create a <br /> greenhouse effect and encourage.grass growth if the hydroseed was <br /> installed too late in the season to establish 75 percent grass cover,or if <br /> the wet season started earlier than normal. Clear plastic should not be <br /> • used for this purpose during the summer months because the resulting <br /> high temperatures can kill the grass. <br /> • Due to rapid runoff caused by plastic sheeting,this method shall not be <br /> used upslope of areas that might be adversely,impacted by <br /> concentrated runoff. Such areas include steep and/or unstable slopes. <br /> • While plastic is inexpensive to purchase,the added cost of installation, <br /> maintenance,removal,and disposal make this an expensive material, ( <br /> up to.$1.50-2.00 per square yard. <br /> • Whenever plastic is used to protect slopes,water collection measures <br /> must be installed at the base of the slope. These measures include <br /> plastic-covered berms, channels,and pipes used to covey clean <br /> rainwater away from bare soil and disturbed areas. At no time is clean <br /> runoff from a plastic covered slope to be mixed with dirty runoff from <br /> a project. <br /> •. Other uses for plastic include: <br /> 1. Temporary ditch liner; <br /> 2.: Pond liner in temporary sediment pond; <br /> 3. Liner for bermed temporary fuel storage area if plastic is not .. <br /> reactive to the type of fuel being stored; <br /> 4. Emergency slope protection during heavy rains;and, <br /> 5. Temporary drainpipe("elephant trunk")used to.direct water. <br /> • 4-26 Volume ll—Construction Stormwater Pollution.Prevention February 2005 <br />