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20 May 1999 <br /> AGE-NC Project No. 99-0604 <br /> Page 5 of 5 <br /> a chilled container under ice and transported under chain-of-custody procedure to a DTSC-certified <br /> laboratory. <br /> 4.3. IN-SITU GROUND WATER SAMPLING PROCEDURES <br /> For the collection of grab ground water samples, soil probe borings will be advanced to the top of <br /> the ground water table as identified by collection of a saturated soil sample. Once ground water has <br /> been encountered,a Geoprobe push-driven water sampling device will be advanced two to three feet <br /> into the water bearing zone. Grab ground water samples will be collected using a Geoprobe water <br /> sampling assembly fitted with a pre-cleaned one-inch 0.01 slotted temporary well screen. Each <br /> ground water sample will be extracted by lowering a Teflon bailer through the hollow center of the <br /> push rods into the screen section. Samples for BTEX and TPH-g analyses will be collected in <br /> laboratory-supplied,40-m1 VOA vials containing 0.5-m1 of hydrochloric acid as sample preservative. <br /> Samples for TPH-d and TPH-mo analyses will be collected in laboratory-supplied, 1-liter amber <br /> bottles. The labeled vials and bottles will be placed in a chilled container under ice and transported <br /> under chain-of-custody to a DTSC-certified laboratory. <br /> 4.4. 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 probing rods will be cleaned prior to advancement at each <br /> probe boring location. <br /> 4.5. BORING ABANDONMENT <br /> All soil borings will be permanently sealed to prevent vertical migration of contaminants. Soil <br /> borings shall be abandoned by backfilling with bentonite or cement-bentonite slurry from the total <br /> depth to surface grade. <br /> Advanced GeoEnvironmental,Inc. <br />