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s BMP C123: Plastic Covering <br /> i. Putnose Plastic covering provides immediate, short-term erosion protection to <br /> ' a 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 /> i` sheeting makes it unsuitable for long-term(greater than six months) <br /> applications. <br /> Due to rapid runoff caused by plastic covering, do not use this method <br /> upslope of areas that might be adversely impacted by concentrated <br /> runoff. Such areas include steep and/or unstable slopes. <br /> Plastic sheeting may result in increased runoff volumes and velocities, <br /> requiring additional on-site measures to counteract the increases. <br /> Creating a trough with wattles or other material can convey clean <br /> water away from these areas. <br /> To prevent undercutting, trench and baekfrll rolled plastic covering <br /> products. <br /> While plastic is inexpensive to purchase, the added cost of <br /> installation, maintenance, removal,and disposal make this an <br /> i <br /> m expensive aterial, up to $1.50-2.00 per square yard. <br /> Whenever plastic is used to protect slopes install water collection <br /> f = <br /> I measures at the base of the slope. These measures include plastic- <br /> covered berms, channels, and pipes used to covey clean rainwater <br /> away from bare soil and disturbed areas. Do not mix clean runoff from <br /> it J a plastic covered slope with dirty runoff from a project. <br /> • Other uses for plastic include: <br /> i <br /> 1. Temporary ditch liner. <br /> i . <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. <br /> J : <br /> 5. Temporary drainpipe("elephant trunk") used to direct water. <br /> Design and Plastic slope cover must be installed as follows: <br /> Installation <br /> 1. Run plastic up and down slope, not across slope. <br /> Specifications <br /> g 2. Plastic may be installed perpendicular to a slope if the slope length <br />{ is less than 10 feet. <br /> f <br /> 3. Minimum of 8-inch overlap at seams. <br /> Er [ <br /> i f <br /> Vohone II—Construction Slori nivalel•Pollution Prevention-August 2012 <br /> 4-26 <br /> , i. <br /> i <br />