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2002 -26- 003-2203 <br />4.2.1.1 Concrete Plug and Cemented Rockfill <br />Golder observed placement and testing of CP material used in construction of the Phase IVa <br />Area. Golder observed and documented testing of approximately 13 cubic yazds of concrete <br />for slump, air entrainment, temperature, placement time and compressive strength. Two tests <br />were performed on slump, and one test was performed on compressive strength for a testing <br />frequency of approximately one test per 13 cubic yazds. This exceeded the minimum <br />specified testing frequency of one test per every 50 cubic yards. All tests met compressive <br />strength specification. The concrete observation and test results aze presented in Appendix H <br />and summazized in Table 15. <br />Golder observed the manufacturing and placement of CR including processing of FSB and <br />cement addition rate. Golder verified at the volumetric mixing truck outlet that the FSB met <br />the gradation specified. Golder also verified at the volumetric mixing truck that cement was <br />added at a minimum rate of 6 percent by dry weight. Cement addition rates were tested at <br />approximately one test per 300 tons. <br />4.2.1.2 Flowable Fill <br />During the remediation of UG-545, Golder observed the drilling of plug placement holes, <br />placement of tunnel plug materials (pea gravel), drilling of flowable fill placement holes, and <br />placement of the flowable fill. Golder observed and documented the height of the flowable <br />fill in the tunnel. The compressive strength of the flowable fill was not tested since the Fill <br />will remain in compression (not shear) under load. <br />4.2.1.3 Geogrid and Select Structural Fill <br />For remediation of the UG-456 lateral, Golder observed Ames excavating a minimum of <br />1 foot over the blasted underground working area, and placing two layers of UX 1700 HS <br />i geogrid. The bottom layer of geogrid was installed with six inches of SSF cover and the <br />c~omzio3woomcerca.poso:~oo3sso3oaoooa,aaeeoo Golder Associates <br />