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As-Built CQA Report for the Construction of Area 2A at the Foothill Sanitary Landfill <br /> San Joaquin County,California <br /> • The force main, electrical conduit and common utility trenches were excavated with a Hitachi 300 <br /> excavator and a CAT 410 backhoe. Pipe was placed on imported sand bedding and the remaining <br /> trench was backfilled with screened operations layer soil. The fill was placed in 12-inch thick loose <br /> lifts and compacted using hand held compactors minimum 90 percent relative compaction, in <br /> accordance with ASTM D1557. AES CQA monitor observed backfill placement operation to ensure <br /> trench backfill materials were compacted without causing any damage to the pipes or conduits. <br /> Field density test results for the LCRS force main trench and common utility trench backfill are <br /> presented in Table 3. <br /> • <br /> • <br /> PA14 Projects114-101(SJCDPW North County and Foothillffoothill CQAIReport\Final ReportlFoothill CQA Rport-Final.docx <br /> 37 <br />