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prefabricated PVC wellheads. Each wellhead consisted of a sliding gate control valve, <br /> two monitoring ports, and a flexible pipe coupling, as shown on the construction record <br /> drawings (Appendix Q. 2-inch Schedule 80 PVC lateral pipes were connected from the <br /> wellheads at the 18-inch HDPE header to the 13 new vertical extraction wells. The 2- <br /> inch lateral pipes were encased within 6-inch CSP casings where buried under the <br /> existing perimeter road, as shown on the record drawings (Appendix Q. <br /> 3.3.3 CQA activities <br /> EMCON's site CQA activities for LFG pipe construction included the following: <br /> • Observed material delivery and unloading. Verified material types and examined <br /> materials for potential defects. <br /> • Observed procedures for lateral connection trench excavation and pipe placement <br /> for correct alignment and slope. <br /> • Observed construction and installation procedures for PVC wellheads, lateral pipe, <br /> and CSP pipe. <br /> • Observed procedures for trench backfill. <br /> The work was constructed consistent with industry-standard construction practices and <br /> the approved Contract Documents. <br /> 3.3.4 Field changes <br /> No field changes were made in the installation of LFG perimeter collection piping. <br /> EMCON/OWT <br /> N:\_LANDFIL\AWI Austin Road-Forward\2004 SVE CQA\text\report\CQA report final.doc Rev.0,1/5105 <br /> 3-4 <br />