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June 24, 2003 -27- 003-2203.7 <br />4.2.1.1 Concrete Plug and Cemented Roc~ll <br />Golder observed placement and testing of CP material used within the footprint of the Phase Nb <br />PSSA. Golder observed and documented testing of approximately 145 cubic yards of concrete for <br />slump, air entrainment, temperature, placement time and compressive strength. Five tests were <br />performed on slump. Five tests were performed on compressive strength for a testing frequency of <br />approximately one test per 29 cubic yards. This exceeded the minimum specified testing frequency <br />of one test per every 50 cubic yards. All tests met compressive strength specification. The concrete <br />observation and test results are presented in Appendix H and summarized in Table 18. <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 the UG-265, UG-494, and UNK-11 laterals, Golder observed Ames excavating a <br />minimum of 1 foot over the blasted underground working area, and placing two layers of UX 1700 <br />HS geogrid. The bottom layer of geogrid was installed with six inches of SSF cover and compacted <br />with a Caterpillar CS563 SDVR, and then the second layer of geogrid was installed transverse to the <br />first. Six inches of SSF was then placed and compacted. <br />4.2.2 Underdrains <br />Golder verified that the underdrains were constructed as specified, that Ames placed OF a minimum <br />of 3 feet deep and 5 feet wide in the Primary Underdrain trench, and 2 feet deep and 4 feet wide in the <br />Secondary Underdrain trenches. Golder verified that Ames removed oversize and unsuitable material <br />From the UF. Golder verified that Ames installed geotextile in the underdrains, monitored for <br />geotextile overlap, and placed a minimum of 6 inches of SSF on the top of the geotextile. <br />• <br />1:\W@20310JOMFa1CertP55Ap603\003330.3.pi00A930RepAo~ Golder A55OCIateS <br />