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• 17S'eptember 2001 <br /> AGNC Project No. 980468 <br /> Page.7 of 7 <br /> 4.2. IN-SITU GROUND WATER SAMPLING PROCEDURES <br /> To collect the grab ground water sample, the probe boring•will be advanced to the depths of 40 feet <br /> and 45 feet•bsg. A Geoprobe push-driven water sampling device will be advanced to the depth'and <br /> then retracted to e)cpose the screen to the water-bearing zone. The grab ground water sample will be <br /> collected using a Geoprobe water sampling assembly fitted with a pre-cleaned one-inch diameter <br /> 0.01 slotted temporary well screen. Each ground water sample will be extracted by lowering a <br /> polyethylene bailer through the hollow center of the push rods into the screen section. Samples for <br /> volatile organic compound and TPH-g analyses will be collected into laboratory-supplied, 40-ml <br /> VOA vials containing 0.5 ml of hydrochloric acid as sample preservative. Samples for semi-volatile <br /> organic compounds and/or TPH-d analyses will be collected into laboratory-supplied, 1-liter amber <br /> 'bottles. The labeled sample containers will be placed in a chilled container under ice and transported <br /> under chain-'Of-custody to a DHS-certified laboratory. <br /> 4.3. EQUIPMENT DECONTAMINATION <br /> • All samplingtools used for sample collection will be thoroughly washed with a solution of Alconox <br /> and rinsed with clean water prior to each sampling location. All probing rods will be cleaned prior <br /> to advancement at each probe boring location. <br /> -4.4. BORING ABANDONMENT <br /> The soil probe boring will be permanently sealed to prevent vertical migration 'of potential <br /> contaminants. Soil borings 'shall be abandoned by backfilling with bentonite or cement-bentonite <br /> slurry" from the total depth,to surface grade. The PHS-EHD will be notified for grout inspection at <br /> least 48 hours prior to conducting grouting procedures. <br /> Advanced GeoEnvironmental,Inc. <br />