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12 February 1999 <br /> AGE-NC Project No. 98-0540 <br /> Page 8 of 8 4 <br /> from a reference point marked of the top of the PVC well casing. Before and after each use, the <br /> measurement device will be rinsed with water. <br /> 4.5. EQUIPMENT DECONTAMINATION <br /> All sampling tools used for sample collection will be thoroughly rinsed with clean water after being <br /> washed with a solution of Alconox.All down-hole drilling and sampling equipment will be pressure <br /> washed prior to starting the boring. <br /> 6 <br /> fI <br /> k <br /> II� <br /> * - Advanced Geo6nvironmental,Inc. C <br />