2011-08-26_REPORT - M1980244 (28)

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- WTI I= 4.2.2 Site Grading AMEC monitored site grading. In areas where the SF contained less than 30 percent by weight larger than 3/4 -inch particle size, nuclear density tests were conducted to verify density and moisture content. A total of 68 moisture - density tests were conducted on 128,400 cubic yards, resulting in a testing frequency of one test per 1,888 cubic yards, exceeding the minimum testing frequency of one test per 2,000 cubic yards. The majority, 94.9 %, of the SF contained more than 30 percent by weight larger than % -inch particle size, and was placed by method specification (per Specification 2200 Section 3.06). AMEC verified that the SF maximum particle size of the fill did not exceed 24 inches, and that lifts were no thicker than one and one -half times the maximum particle size. When SF was placed for slope reduction, AMEC verified that Ames scarified in -situ materials prior to fill placement. 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 AMEC Earth & Environmental, Inc. 2000 S Colorado Blvd 2 -1000 Denver, CO 80222 Tel 303 - 935 -6505 Fax 303 - 935 -6575 www.amec.com 21