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I• <br />r 1 <br />LJ <br />r1 <br />June 24, 2003 -28- <br />4.2.3 Leak Detection Trench <br />003-2203.7 <br />Golder verified that the Phase Nb PSSA LDT was a minimum of 1 foot wide by I foot deep, and that <br />LDF, geomembrane, geotextile and pipe were installed as specified. <br />4.2.4 Subgrade Preparation <br />Golder monitored subgrade preparation, including verification that Ames compacted the subgrade <br />with a smooth drum vibratory compactor. Golder verified that Ames removed protruding rocks from <br />the subgrade surface prior to SLF placement. Golder verified that the subgrade surface was moisture <br />conditioned, smooth, and unyielding prior to SLF placement. <br />4.2.5 Site Gradine <br />Golder monitored site grading. Due to the gradation of the SF used for site grading, the compaction <br />of the fill could not be tested with a nucleaz density gauge ([hat is, the fill had greater than 30 percent <br />by weight larger than three-quarter-inch particle size). Golder verified that the maximum particle size <br />of the fill did not exceed 24 inches, and that lifts were no thicker than one and one-half times the <br />maximum particle size. When SF was placed for slope reduction, Golder verified that Ames scarified <br />in-situ materials prior to fill placement. Golder verified that Ames made a minimum of four passes <br />with the SDVR compactor. <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 veriftcation. <br />4.2.6.1 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 />identified angulaz particles on the fill surface, ruts, and desiccation cracks, and brought these features <br />to the attention of Ames for repair. Ames laborers placed fines from their SLF processing plant or <br />from temporary piles of fine SLF to smooth and re-compact the fill surface in areas that were <br />L\00\3203\00001FnICee\PSSA0603\0033303.M00.0'DAlftep.dot Golder Associates <br />