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22 February 2000 AGE-NC Project No. 98-0481 Page 6 of 7 5.1. SOIL SAMPLING PROCEDURES Soil boring(s) will be advanced using hollow-stem auger drilling techniques. Soil samples will be collected at five-foot depth intervals. Relatively undisturbed soil samples will be collected using a California modified split-spoon sampler fitted with 2-inch diameter, 6-inch long brass sleeves. The soil sampler will be driven into undisturbed soil below the extent of the auger. Upon removal from the sampler, the sample sleeve is separated with a clean soil knife. The exposed ends of the second sleeve will be covered with Teflon sheets, capped and sealed with tape. Soil sample duplicates 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 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 to a DHS-certified laboratory. 5.2. GROUND WATER SAMPLING PROCEDURES • For the collection of"grab" ground water samples, soil borin s will be advanced to the to of the �' l�' p � g p ground water table as identified by collection of a saturated soil sample. Once ground water has been encountered as identified by a saturated soil sample, a hydropunch-equivalent water sampling device will be driven two to three feet into the water bearing zone. Grab ground water samples will be collected from the hydropunch-equivalent water sampling assembly or a pre-cleaned one-inch diameter 0.010-inch slotted temporary well screen. Each ground water sample will be extracted by lowering a bailer through the hollow center of the push rods into the screen section or by retrieving the hydropunch assembly. Samples for BTEX,TPH-g, fuel oxygenating compounds, and chlorinated hydrocarbon analysis will be collected in laboratory-supplied 40-m1 VOA vials containing 0.5 ml of hydrochloric acid as sample preservative. Samples for TPH-mo analysis will be collected in laboratory-supplied one-liter amber glass containers. The labeled sample containers will be placed in a chilled container under ice and transported under chain-of-custody to a DHS-certified laboratory. 5.3. EQUIPMENT DECONTAMINATION All sampling tools used for sample collection will be thoroughly washed with a solution of Alconox and rinsed with clean water prior to use. All down-hole drilling and sampling equipment will be pressure washed prior to starting the boring. Advanced GeoEnvironmental,Inc.