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21 September 1998 <br /> AGE-NC Project No 97-0290 <br /> Page 5 of 8 <br /> 32 SOIL SAMPLING PROCEDURES <br /> Soil samples will be collected using Geoprobe push-driven 2-inch diameter discrete and continuous <br /> core samplers fitted with a four-foot 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 sham-of-custody procedure to a DTSC-certified <br /> laboratory <br /> 3 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 contairung 0 5-ml 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 /> 3 4 PROBE BORING ABANDONMENT <br /> All probe borings will be permanently sealed to prevent vertical migration of contaminants Soil <br /> bongs shall be abandoned by backfilling with bentonite or cement-bentonite slurry from the total <br /> depth to surface grade <br /> 35 SOIL BORING ADVANCEMENT <br />• <br /> Advanced GeoEnvironmentai,Inc <br />