2011-08-26_REPORT - M1980244 (28)

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ameO • AMEC monitored construction of the Leak Detection Trenches (LDT), including verification that Ames excavated the trench to minimum required dimensions and placed materials as specified. AMEC performed CQA laboratory testing of grain size and Atterberg limits of the Leak Detection Fill (LDF) placed in the LDT. • AMEC visually monitored subgrade preparation to confirm that the subgrade surface was unyielding, free of organic matter and other unsuitable materials, and that the subgrade surface was compacted prior to Soil Liner Fill (SLF) placement. AMEC visually monitored the placement and compaction of SLF including observation of depth verification performed by Ames, particle size, moisture conditioning, and compaction of the fill. AMEC performed in -place nuclear moisture density testing, and performed CQA laboratory testing of grain size, moisture content, Atterberg limits, Proctor, and permeability. AMEC also provided visual monitoring of the SLF surface preparation and moisture conditioning for geomembrane deployment, including verification that the surface was proof - rolled, compacted, and hand - worked so as to be free of desiccation cracks, abrupt grade changes, and sharp stones or objects. AMEC also observed the excavation, backfill, and compaction of the anchor trenches. AMEC visually monitored the placement of Drain Cover Fill (DCF) above the primary geomembrane in the 2011 Phase 5 VLF OSA 2nd Portion, including verification of lift thickness and grade control, identification and removal of deleterious materials, and verification that care was exercised in fill placement to avoid geomembrane damage. AMEC performed CQA laboratory testing of grain size and Atterberg limits. • AMEC monitored the installation of High Volume Solution Collection System (HVSCS) piping, visually verifying that pipes were installed to the lines and grades shown on the plans. AMEC monitored the ambient air temperatures and the temperatures of all fills, including SLF, in accordance with project specifications. The ambient air and fill temperatures monitored during fill activities are summarized in Tables 2 and 3, respectively. 1.2.2 CQA/CQC Monitoring of Geosynthetics Installation AMEC provided CQA monitoring of geosynthetics used for the 2011 Phase 5 VLF OSA 2nd Portion. CQA services provided by AMEC consisted of performing geosynthetics inventory and checking quality control certifications prior to geosynthetics deployment. AMEC AMEC Earth & Environmental, Inc 2000 S. Colorado Blvd 2 -1000 Denver, CO 80222 Tel 303 - 935 -6505 Fax 303 - 935 -6575 www amec com