2012-12-27_REPORT - M1980244 (11)

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ame0 • AMEC monitored construction of the Stormwater Controls, including verification that Ames excavated the trench to minimum required dimensions and placed materials as specified. AMEC performed in -place nuclear density testing, and performed CQA laboratory testing of grain size, moisture content, Atterberg limits, and standard Proctor compaction of the Pipe Bedding Material (PBM) placed in the Stormwater Controls. • 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, standard Proctor compaction, 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 Process Solution Enhancement System, 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, moisture content, and Atterberg limits. • AMEC visually monitored the placement of Select Structural Fill (SSF) above the DCF in the Process Solution Enhancement System, 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, moisture content, and Atterberg limits. • AMEC monitored the ambient air temperatures and the temperatures of 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. AMEC Environment & Infrastructure, Inc 2000 S Colorado Blvd 2 -1000 Denver, CO 80222 Tel 303 - 935 -6505 Fax 303 - 935 -6575 www.amec.com 3