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war/ 18 June 2001 AGE-NC Project No. 98-0433 Page 5 of 8 bearing zone. Grab ground water samples will be collected using a Geoprobe water sampling assembly with a pre-cleaned one-inch 0.01 slotted temporary well screen. Each ground water sample will be extracted by lowering a steel bailer through the hollow center of the push rods into the screen section. Samples will be collected in laboratory-supplied, 40-m1 VOA vials containing 0.5-m1 of hydrochloric acid as sample preservative and 1-liter containers. The labeled vials and liter containers will be placed in a chilled container under lee and transported under chain-of-custody to a DHS- certified laboratory. 3.3. MONITORING WELL INSTALLATION AND SAMPLING Soil borings will be advanced using a truck-mounted drill rig equipped with eight-inch and fifteen-inch hollow-stem augers. Soil samples will be collected from each soil boring at five-foot intervals,beginning at 5 feet bsg: Relatively undisturbed soil samples will be collected ahead of the boring bit in each boring using a California modified split-spoon sampler fitted with 2-inch diameter, 6-inch long brass sleeves.Upon removal from the sampler,the sample sleeves 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 sampled in the borings will be visually classified by an AGE geologist in accordance with the USCS. Additionally, soil samples may be field screened for the presence of volatile organic compounds using an OVM. Soil sample descriptions and OVM readings will be recorded on a log for each boring. Each preserved soil sample sleeve 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 to a DHS-certified laboratory. Soil cuttings generated during drilling of the soil borings will be contained within plastic sheeting on the site for storage. Drums containing decontamination water will be stored on-site pending appropriate removal, disposal and/or treatment. The proposed monitoring well design is illustrated in Figures 3 and the proposed ground water recovery well design is illustrated in Figures 4. Following completion of the eight inch soil boring, a 2-inch diameter monitoring well Schedule 40 PVC 0.02-inch slotted well screen and casing will be installed. A 20-foot section of well screen will be installed from a depth of approximately 10 feet to 30 feet bsg, blank casing will extend from 10 feet bsg to the ground surface. The casing, filter pack and well sealing materials will be placed into the borehole through the interior of the hollow-stem augers. After installing the well casing, filter pack material consisting of pre-washed #3 Lonestar sand will be added from the bottom of the borehole to approximately two feet above the screened interval. Advanced GeoEnvironmental,Inc.