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05.February 1999 ti AGE-NC Project No. 98-0433 Page 6 of 9 , ' Soil samples recovered from the borings will be' visually classified by an AGE geologist in accordance with the.Unified Soil Classification System(USCS). Soil sample duplicates will be field screened for.the presence of volatile organic compounds using an organic vapor meter (OVM) equipped with a photo ionization detector(PID) pre-calibrated to isobutylene. Following sample collection, each preserved 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 procedure to a DHS-certified laboratory. ' 4.3. GROUND WATER SAMPLING PROCEDURES For the collection-of"grab"ground water samples, selected probe borings will be'advance&to the ' top of the ground water table as identified by collection of a saturated soil sample. Once ground water has been encountered, a Geoprobe push driven water sampling device will be advanced two to three feet into the water bearing zone. Grab ground water samples will be collected using a Geoprobe water sampling assembly or a pre-cleaned one-inch 0.01 slotted temporary well screen. Each ground water sample will be extracted by lowering a Teflon 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 ml of hydrochloric acid (18%) as sample preservative and 1-liter amber bottles. The labeled vials will be placed in a chilled container under ice and transported under chain- of-custody to a DHS-certified laboratory. ' 4.4. MONITORING WELL INSTALLATION Monitoring well pilot borings will be advanced using hollow-stem auger drilling techniques. Soil ' samples will be collected from each pilot boring at five-foot intervals. Relatively undisturbed soil samples will be collected in each of the borings 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 Unified Soil Classification System ' (USCS). Additionally, soil samples will be field screened for the presence of volatile organic compounds using an OVM. Following sample collection, each preserved 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 Advanced GeoEnviron mental,Inc.