2012-12-27_REPORT - M1980244 (16)

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ameO 4.2.2 Site Grading AMEC monitored site grading. The SSF contained more than 30 percent by weight larger than 3/4 -inch particle size, and was placed by method specification (per Specification 2200 Section 3.06). AMEC verified that the SSF maximum particle size of the fill did not exceed 3 inches, and that lifts were no thicker than one foot (compacted). AMEC verified that Ames made a minimum of four passes with the SDVR compactor. 4.2.3 Soil Liner Fill Field testing included monitoring of placement and preparation of SLF for geomembrane deployment, testing in -place moisture and density with a nuclear gauge, and monitoring depth verification to project specifications. 4.2.3.1 Field Monitoring AMEC observed SLF placement to verify lift thickness, adequate compaction, acceptable moisture conditions, final compacted thickness, and suitability for geomembrane deployment. AMEC identified angular particles on the fill surface, ruts, and desiccation cracks, and brought these features to the attention of Ames for repair. Ames completed repairs by placing fines from their SLF processing plant or from temporary piles of fine SLF to smooth and re- compact the fill surface in areas that were observed to be rough or inadequate, as discussed in Section 2.5. AMEC and Lone Star approved the final surface of the SLF within the Phase 5 Berm Modification prior to geomembrane deployment. 4.2.3.2 Moisture - Density Test Results AMEC performed a total of four (4) in -place moisture - density tests of SLF. AMEC compared results of the field moisture content and density tests to the maximum standard Proctor dry density and optimum moisture content values of material with similar gradation and plasticity AMEC Environment & Infrastructure, Inc. 2000 S. Colorado Blvd 2 -1000 Denver, CO 80222 Tel 303 - 935 -6505 Fax 303 - 935 -6575 www.amec.com 15