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amec19 <br />5.4 Pipe QC Certificates <br />High density polyethylene (HDPE) piping used to construct the LDTs and the High Volume <br />Solution Collection System (HVSCS) was manufactured by WL Plastics Corp of Ceder Ciry, <br />Utah. AMEC's review of the QC certificates indicates that the piping met project <br />specifications. HDPE pipe QC certificates are presented in Appendix 1 -7. <br />AMEC Earth & Environmental, Inc. <br />2000 S Colorado Blvd 2 -1000 <br />Denver, CO 80222 <br />Tel 303 - 935 -6505 <br />Fax 303 - 935 -6575 www amec com <br />26 <br />