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MRR 31 2000 3: 1OPM GREGG DRILLING 5253130302 P. 3 <br /> Mr. Chris Yarnell <br /> April 1, 2002 <br /> The CPTISampling holes will be grouted using our support rig. The grouting procedure <br /> consists of either retraction grouting techniques, which permits grouting of the hole <br /> from "the bottom up" as the CPT rods are retracted, or pushing or vibrating a hollow <br /> CPT rod with a "knock out" plug back down the hole to the test hole termination depth. <br /> Bentonite grout is then pumped under pressure as the tremie pipe is pulled from the <br /> hole. Various Regional Water Control Boards have reviewed both of these procedures <br /> and have approved either of these methodologies. <br />