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25 May 2001 <br /> AGE-NC Proiect No. 98-046 <br /> Page 6 of 6 <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 <br /> of the ground water table or water-bearing zone as measured in monitoring wells currently on-site <br /> and,ior identified by collection of a saturated soil sample. Once ground water has been encountered, <br /> a Geoprobe push-driven water sampling device will be advanced two to three feet into the water <br /> bearing zone. Grab ground water samples will be collected using a Geoprobe water sampling <br /> assembly fitted with a pre-cleaned one-inch 0.01 slotted temporary well screen. Each ground water <br /> sample will be extracted by lowering a Teflon bailer through the hollow center of the push rods into <br /> the screen section. Samples for BTEX, TPH-g, and fuel oxygenate analyses will be collected in <br /> I aboratory-supplied,40-m1 VOA vials containing 0.5-m1 of hydrochloric acid as sample preservative. <br /> The labeled vials will be placed in a chilled container under ice and transported under chain-of- <br /> 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 using a tremmie <br /> pipe from the total depth to surface grade. <br /> Advanced GeoEnvironmentai,Inc. <br />