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iI <br /> � <br /> Stockpilee ahall be constn:cted to ieolate potential,y-contaminated <br /> material from the environment. No excavated material shall be placed <br /> that impaire acceee to adjacent eites or facilities or ie detrimental to � <br /> the construction work in any way. Stockpilee ahall be constructed to � <br /> minimize the artaunt of soil requiring disposal, and ehall be conetructed <br /> to eneure that there vill be no contamina=ion of the eurrounding eoil. � <br /> A written deily log suall be kept to tzack the eource of contaminated <br /> material in each stockpilc. <br /> The Contractor shall fence atockpile ar:a and poet a sign at each � <br /> en[rance to the etockpile area, bearing the legend, "Danger -- <br /> Unauthorized Pereonnel Keep Out " or an equivalent legend, �rritten in � <br /> S_n�lieh, and legible from a distance of 25 feet or more. <br /> Stockpilee ehall be protected aaainst erosion by wind and rain <br /> 1. Chemically reeietant underliner in the etorkpiling erea. The � <br /> underliner ehall be a polyethylene geomembrane with a minimum <br /> thickneas of 10 ails. Scrim-reinforced underlinere �hall have a � <br /> minimum weiaht of 40 pounde per 1,000 equare feet. The ground <br /> eurface on which the geomembrane ie to be placed ehall be fzee of <br /> rock3 greetar than 0.5 inch in diameter and any other object which � <br /> could damaae the geomembrane. Adjacent geomembrane eectione ahall <br /> be continuously overlepped by a minimum of 3 feet. It ie not <br /> neceseary to eeem adiacent geomembrane eectiona below the <br /> atockpilee. � <br /> 2. The ConCractor ehell place a leYer of aeotextile or plywood to <br /> fully underlie and protect the membrene in any locations � <br /> containing rocks oz debri• which are greater than 0.5 inch in <br /> diaR.eter on the ground �urface, or in any ereas through which <br /> vehicular traffic will travel. The plywood ehall have a minimum <br /> thickneeo of 1/Z inch. �� <br /> � <br /> 3. Cover stockpilee to prevent precipitation from eneering <br /> atockpiles. Non-reinforeed ■toekpile covezs shall be polYethylene � <br /> geomembrane with e minimum thickneae of 10 mils Scrim-reinforeed <br /> etockpile covers �hall have a minimum weight of ]6 pound� per <br /> 1 000 equare feet. Stockpile covers �h�ll be anchored to prevent <br /> them from being removed by wind. � <br /> 4. Bernie ehall be conet=ucted eurrounding individusl etockpiles. <br /> Vehicle acceee oointe shall also be bermed. Bernu c�n be � <br /> con�tructed of etrew bales. <br /> 5. The stockpile cell shell be conetructed eo as to Drevene any water , <br /> from rvnnina throuah the stockpiled eoil and creating a leachate. <br /> Stockpiled materiale ehall be covered and pzotected from wznd, <br /> precipit�tion and runoff. My contamineted runoff mus[ be <br /> collected and diepoaed of in an acceptable manner at the , <br /> Contzactor'e expense. The sump in the secondary etockpiling area <br /> ehall be excavated from ehe ground �urEace, lined by a geomembzane <br /> Divi�ion 2 Page 12 , <br /> ISverett Station OS/12/00 <br /> N:\Johs\97093\TRANS\SNO�SPSCS\100�cd\Street eite\98SP6C2RI.docf�� <br /> ll ' <br />