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October 2004 -23- 043 -2170 <br />4.2.5 Site Grading <br />0 <br />Golder monitored site grading. Due to the gradation of the SF used for site grading, the compaction <br />of the fill was not tested with a .nuclear density gauge (that is, the fill had greater than 30 percent by <br />weight larger than Y4 -inch particle size). Golder verified that the maximum particle size of the fill did <br />not exceed 24 inches, and that lifts were no thicker than one and one -half times the maximum particle <br />size. When SF was placed for slope reduction, Golder verified that Ames scarified in -situ materials <br />prior to fill placement. Golder verified that Ames made a minimum of four passes with an SDVR. <br />4.2.6 Soil Liner Fill <br />Field testing included monitoring of placement and preparation of SLF for geomembrane deployment, <br />testing in -place moisture and density with a nuclear gauge, and monitoring depth verification. <br />4.2.61 Field Monitoring <br />Golder observed SLF placement to verify lift thickness, adequate compaction, acceptable moisture <br />conditions, final compacted thickness, and suitability for geomembrane deployment. Golder <br />i identified angular particles on the fill surface, ruts, and desiccation cracks, and brought these features <br />to the attention of Ames for repair. Ames laborers placed bentonite, fines from the SLF processing <br />plant, or fines from temporary piles of fine SLF to smooth and re- compact the fill surface in areas that <br />were observed to be rough or inadequate, as discussed in Section 2.6. Golder and Poly -Flex approved <br />the final surface of the SLF prior to geomembrane deployment. <br />4.2.6.2 Moisture - Density Test Results <br />Golder performed a total of 244 in -place moisture - density tests of SLF. Golder compared results of <br />the field moisture content and density tests to the Proctor dry density and optimum moisture content <br />values of material with similar gradation and plasticity characteristics. Proctor dry density and <br />optimum moisture content values for samples with greater than ten percent plus 3 / 4 -inch material were <br />corrected according to ASTM D4718 to facilitate direct comparison to nuclear density values. The <br />moisture- density testing frequency of approximately one test per 395 cubic yard's exceeded the <br />minimum specified testing frequency of one test per 500 cubic yards. Nuclear density tests <br />performed for the OSA SLF are summarized in Table 13. A total of S7 out of the 244 nuclear density <br />• tests initially did not meet specifications. These areas were reworked and re- compacted until they <br />L 4M17010WCm1-QAPhlVc- IOU%0432170.0400.12n&CrnnfVadw Golder Associates <br />