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� <br /> � BMP C123: Plastic Covering <br /> � ��/N�IO�C ���BSIII' l'U\l'illlE' �l(O\�it�l'ti lillllll'ljl:lli. S�lUll-;Cllll l'I���>Il�fi �1I'UIl':11Ui1 I�� <br /> slopcs and disturbcd :uc:rs. <br /> � Cnndilion.� qJ . Plastic covering nu�y bc uscd �m distunc�d arcas �hat requin c���cr <br /> ('s� mcasmcs for Icss than 30 dnys. c�ccpi a� statcd hclu��. <br /> � Pl;�stic is paiticularly uscful for protccting cut and fill slopcs and <br /> � stockpiles. i�btc: 'I'hc rclati��ciy rapid brcakdown of most polycthylcnc <br /> shecting makcs it unsui�ahlc for long-tcrni (grcatcr th�n six monihsj <br /> applications. <br /> i • Clcar plaslic sheeting can bc uscd ovcr ncwly-sccdcd arcas «� crcmc ;� <br /> grcenhouse effect and encourage grass �rowth itlhc h�'drosecd ��as <br /> � installcd too latc in thc scason to cstablish 75 perccnt grass co�cr, or if <br /> thc wct scason startcd carlicr than nrnmal. Clear plastic should not bc <br /> uscd fo�this puiposc during the sutnmer months becausc Ihe resulting <br /> high tcmperaiures can kill the grass. <br /> ' • Uue to rapid runoff causcd by plastic shecting, this method shall not bc <br /> uscd upslopc of mcas that might hc advcrscly impacted by <br /> � concenu•ated iunoff. Such arcas include s�eep and/or unstable slopes. <br /> • \'��n��� ni:,s�;� �5 ;,,�Xp�„s��� w n�����,as�, thc addcd cost of instullation, <br /> maintcnancc, removal, and disposal makc �his an cxpensivc matcrial, <br /> � up to S 1.50-2.00 per squarc yard. <br /> • Whenever plastic is used to protect slopes, ��ater collection measures <br /> I must be installcd at ihe base of ihe slapc. These mcasures indudc <br /> plastic-covcrcd berms, channcls, and pipcs uscd to covey cican <br /> rainwatcr awav from bare soil and disturbcd arcas. At no timc is cican <br /> � ivnoff fi�om a plasiic covcred slopc to bc mixcd with diriy ivnoff from <br /> a project. <br /> • Other uscs for plastic includc: <br /> � 1. Temporary ditch lincr: <br /> Z. Pond liner in temporary sediment pond; <br /> I 3. Liner for beimed temporary fucl storage arca if plastic is not <br /> rcaclivc to the typc of�tucl being stured; <br /> I 4. Emcrgcncy slopc protection dwin6 hcavy rains; and. <br /> 5. Temporary drainpipe(.,elephant hUnk") used to dicect water. <br /> I <br /> � <br /> I <br /> I4-Z6 Volume ll- Construction Sformwater Pollulion Preven(ion February 2005 <br /> I �� <br /> � <br />