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25 August 1998 <br /> AGE-NC Project No. 98-0481 <br /> Page 7 of 7 <br /> core samplers fitted with a four-foot long Teflon sleeve.Upon removal from the sampler, the sample <br /> sleeve is separated with a clean soil knife. The exposed ends of the second sleeve will be covered <br /> with Teflon sheets, capped and sealed with tape. Soils encountered in the borings will be visually <br /> classified by an AGE geologist in accordance with the Unified soil Classification System (USCS). <br /> Additionally, soil samples with be field screened for the presence of volatile organic compounds <br /> using an OVM. <br /> Following sample collection, each preserved sample sleeve will be labeled with the boring location, <br /> depth,time, date and sampler's initials. Appropriately sealed and labeled samples will be placed in <br /> a chilled container under ice and transported under chain-of-custody procedure to a DTSC-certified <br /> laboratory. <br /> 4.3. GROUND WATER SAMPLING PROCEDURES <br /> For the collection of"grab" ground water samples, selected probe borings will be advanced to the <br /> top of the ground water table as identified by collection of a saturated soil sample. Once ground <br /> water has been encountered, a Geoprobe push driven water sampling device will be advanced two <br /> to three feet into the water bearing zone. Grab ground water samples will be collected using a <br /> Geoprobe water sampling assembly or a pre-cleaned one-inch 0.01 slotted temporary well screen. <br /> Each ground water sample will be extracted by lowering a Teflon bailer through the hollow center <br /> of the push rods into the screen section. Samples will be collected in laboratory-supplied, 40-m1 <br /> VOA vials containing 0.5-m1 of hydrochloric acid as sample preservative. The labeled vials will be <br /> placed in a chilled container under ice and transported under chain-of-custody to a DTSC-certified <br /> 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 probe 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 />