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October 2004 -22- 043-2170 <br />• Golder observed the manufacturing and placement of CR including processing of FSB and cement <br />addition rate. Golder verified at the volumetric mixing truck outlet that the FSB met the gradation <br />specified and that cement was added at a minimum rate of 6 percent by dry weight. Cement addition <br />rates were tested at approximately one test per 300 tons. <br />4.2.1.2 Geogrid and Select Structural Fill <br />For remediation of laterals, Golder observed Ames excavating a minimum of 1 foot over the blasted <br />underground working area, and placing two layers of Tensaz UX 1700 HS geogrid. The bottom layer <br />of geogrid was installed with 6 inches of SSF cover and compacted with a Caterpillar CS563 smooth <br />drum vibratory roller (SDVR), and the second layer of geogrid was installed transverse to the first. <br />Six inches of SSF was then placed and compacted. <br />4.2.2 Underdrains <br />Golder verified that the Secondary Underdrains (SU) were constructed as specified, that Ames placed <br />OF a minimum of 2 feet deep and 4 feet wide in the SU trenches. Golder verified that Ames removed <br />• oversize and unsuitable material from the UF. Golder verified that Ames installed geotextile in the <br />underdrains, monitored geotextile overlap, and placed a minimum of 6 inches of SSF on the top of the <br />geotextile. <br />4.2.3 Leak Detection Trench <br />Golder verified that the Phase Nc LDT was a minimum of 1 foot wide by 1 foot deep, and that LDF, <br />geomembrane, geotextile and pipe were installed as specified. <br />4.2.4 Subgrade PreQazation <br />Golder monitored subgrade preparation, including verification that Ames compacted the subgrade <br />with an SDVR. Golder verified that Ames removed protruding rocks from the subgrade surface prior <br />to SLF placement. Golder verified that the subgrade surface was moisture conditioned, smooth, and <br />unyielding prior to SLF placement. <br />• <br />~:w+mmwomc<n~eeerv<-<oonaunvoawuu+uc<neervcaa Golder Associates <br />