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BMP C123: Plastic Covering <br />Parposr <br />Conditinns nj <br />Clsc <br />Plastic coccring provides immediatc, short-temi crosion protcction ro <br />slopcs and disturbcd arcas. <br />. Plastic covcring rnuy bc uscd on dislurbed arcas that rcyuirc covcr <br />mcasures for less �han 30 days, except as statcd belo���. <br />. Pl;utic is particularly uscful for protcciing cut and fill s�opcs and <br />stockpiles. Note: Thc rclativcly rapid brcakdown of must polyethylene <br />�hccting makcs it unsuitablc for long-tcrm (greatcr than six months) <br />,ipplications. <br />. Clcar piastic sheeting can be used over newly-seeded areas to crcate a <br />grecnhouse efTect and encourage grass gro�elh if thc hydrosecd was <br />installed too late in il�e season to establish 75 percent gnss -over, or if' <br />the �eet season starlcd carlier than nornial. Clr.ir plastic should not be <br />used �or this purpose during the stunmer months because the resulting <br />high tcmperawres can kill thc grass. <br />• Due to rapid rano0�caused hy plastic sheeting, this method shall not bc <br />us�d upslope of arcas that mieht bc ad��erscl}� impacted by <br />coneentrated runufT. Such xreas include steep ar.cVor unstable slopes. <br />. While plastic is incxpensi��e to purchase, the �dJed cost of installation, <br />mainten�ncc, remoeal, and disposal make this an e�pensi��c material, <br />up to S 1 50-2.00 per squarc yard. <br />.�Vhenc��cr plastic is used to protect slopes, ��a�er collection measures <br />must be installed at the base of the slope. i�hese measures includc <br />plastic•co��crcd bcrnis, channds, and pipcs uscd to co�•cy cican <br />r,iim��atcr a��ay Gom bazc soil and disturbcd arcas. At no timc is cican <br />nmofT from a plastic covcrcd slopc to he miccd wi�h diriy mm�ff from <br />a projcct. <br />• Othcr uscs far plastic includc: <br />1. "I'cmporary ditch lincr; <br />2. Pond lincr in �cmporary scdinunt pond; <br />3. I.incr fon c�mtcd tcutporary (ucl tilora�,c ;ur:� if plastic is nul <br />reactive lo the rype of fuel heing stored; <br />4. lancrgency slopc protcetion during hcavy rains; and, <br />5. Tcmponry dr;iinpipc („clephant tnmk") uscd !o dircct watcr. <br />4-26 Vo/ur;ie !1- Conslrucfion Sfomiwater Pollution Prevention February 2005 <br />