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As-Built CQA Report for the Construction of Area 2A at the Foothill Sanitary Landfill San Joaquin County,California ■ Leachate Collection and removal system (LCRS) construction, including placement of LCRS • granular drainage material (GDM) and HDPE pipes on the floor and geocomposite drain material on the side slopes; ■ Operations soil layer construction on the floor and side slopes; ■ Sacrificial geomembrane and ballast system installation on slopes above the limits of operations layer; ■ Leak location survey of bare membrane and the completed liner system; and ■ Miscellaneous construction including perimeter termination berms, access road subgrade, drainage facilities and leachate piping,pump and controls. The limits of the Area 2A liner are shown on Figure 3. Typical composite liner details for the floor and side slope liners are shown on Figure 4. The components of the liner system included the following(from bottom to top): Bottom Liner ■ Prepared subgrade; ■ A 1-foot thick foundation layer; • ■ Geosynthetic Clay Liner (GCL); ■ A 60-mil (DST) HDPE geomembrane liner; ■ A leachate collection layer consisting of a 9-inch thick layer of GDM with a hydraulic conductivity of 1 cm/sec or greater; ■ An 8-oz non-woven geotextile filter layer; and ■ A 2-foot thick operations layer consisting of minus 1-inch screened soil. Side Slope Liner ■ Prepared subgrade; ■ GCL; ■ A 60-mil DST HDPE geomembrane liner; ■ Geocomposite drain material; and ■ A 2-foot thick operations layer consisting of minus 1-inch screened soil up to 20 linear feet measured along the slope from the toe of slope or a sacrificial geomembrane layer beyond this limit. R.J. Gordon Construction, Inc. (R.J. Gordon), of Pleasant Hill, California, was the General Contractor • for the construction of the Area 2A liner system. Great Basin Environmental, Inc. (GBE) of PM4 Projects114-101(SJCDPW North County and Foothiliffoothill CQAIReportlFinal ReportlFoothill CQA Rport-Final.docx 2