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' 24 September 1999 ' AGE-NC Project No. 96-0232 Page 11 of 12 ' which allows controlled flow out of the bottom of the bailer by lifting the check valve. 4.2.4. Sample Handling ' Ground water samples will be collected into laboratory supplied containers. Ground water samples for TPH-g, TPH-d, BTEX and fuel oxygenate (EPA 8260) analyses will be collected into 40-m1 VOA vials containing 0.5-m1 of hydrochloric acid as preservative and into one-liter amber bottles. ' Following collection the samples will be appropriately labeled and placed on ice and kept in a cooler until delivered to the laboratory for analysis. Chain-of-custody protocols will be used to document sample custody transfer from the field to the analytical laboratory. A chain-of-custody form will ' accompany the samples. ' 4.3. PROBE BORING SOIL SAMPLING PROCEDURES At least one soil probe borings will be advanced using direct push technology (Geoprobe 5400 soil probing unit) for performance of a physicochemical and bioenumeration soil sample analysis. Relatively undisturbed soil samples will be collected at five foot intervals beginning at 10 feet bsg ' in all other borings using a Geoprobe soil sampling assembly loaded with pre-cleaned 1.125-inch by 6-inch brass sleeves. Upon soil sample retrieval, the sample sleeve will be separated with a clean soil knife. The exposed ends of the second sleeve will be covered with Teflon sheets, capped and ' sealed with tape. Soils encountered in the borings will be visually classified by an AGE geologist in accordance with the Unified Soil Classification System (USCS). Additionally, soil samples will be field screened for the presence of volatile organic compounds using an organic vapor meter ' (OVM). Following sample collection, each soil sample will be labeled with the boring location, depth, time, ' date and sampler's initials. Appropriately sealed and labeled samples will be placed in a chilled container under ice and transported under chain-of-custody procedure to a microbiological ' laboratory. All soil probe borings will be backfilled from total depth to surface grade utilizing a PVC tremie pipe and portland cement. 4.4. PROBE BORING SOIL-GAS SAMPLING PROCEDURES ' A van-mounted Geoprobe 5400 probing unit equipped with 1.125-inch diameter rods and soil-gas sampling assembly will be for collection of soil-gas samples. The soil probe boring locations are depicted on Figure 2. Soil-gas samples will be collected at approximately 7 feet bsg utilizing a Geoprobe expendable point,post-run tubing system soil vapor assembly. The assembly consists of Advanced GeoEnvironmental,Inc.