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I. General <br />A. Materials shall be new, free of defects, and designed for the purpose for which they <br />are proposed. <br />B. Aggregate base shall be Caltrans Class II <br />C. Bentonite shall be montmorillonite <br />D. Granular bentonite shall be #4 or #10 mesh in size <br />E. Powdered bentonite shall be of a size such that 80% passes through a 200 sieve <br />F. Bentonite grout shall be a mixture of a maximum of 7 gallons of water per 94 Ib bag of <br />Portland cement, which conforms to ASTM C 150, Type I. Add approximately 5 <br />percent by weight of bentonite powder. <br />G. GCL shall be comprised of synthetic monofiber fabric encasing a minimum 0.75 lb <br />montmorillonite per square foot. GCL shall be Bentofix NWL or equivalent. GCL is <br />available at Foothill Landfill. The Contractor shall get GCL from Foothill Landfill when <br />needed. <br />H. LFG well drain rock shall have the following size gradation, or approved equivalent: <br />90% passing 1/2" sieve <br />10% passing 1.5" sieve <br />I. LFG well plug shall be soil obtained on site from a location identified by the Engineer. <br />J. LFG well pipe shall be flush -thread schedule -80 PVC <br />K. PVC fittings shall be Schedule 80 or as where indicated <br />L. Flanges shall be provided with flange gaskets, bolts, nuts and washers <br />M. Flange gaskets shall be full face EPDM or Viton <br />N. Bolts, nuts and washers shall be 304 or 316 stainless steel <br />O. Flanged Gate Valves shall : <br />• Be 125 Ib pressure rated <br />• Be single -piece molded PVC body <br />• Have stainless steel stem <br />• Be ASAHI America, GF or equivalent <br />P. HDPE pipe shall be SDR 15.5 <br />Q. HDPE fittings shall be factory -injection -molded <br />On -Call LFG System Maintenance Contractor 7 <br />San Joaquin County Purchasing Department <br />