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• 22 June 2001 <br /> AGE-NC Project No 01-0839 <br /> Page 6 of 7 <br /> 4.0. FIELD PROCEDURES <br /> All field procedures will be overseen by an AGE representative under the supervision of a California <br /> Registered Geologist Procedures for the advancement of borings, soil sampling, ground water <br /> sampling, equipment decontamination and sample shipment are as follows <br /> 4 1 BORING ADVANCEMENT AND SOIL.SAMPLING <br /> The soil borings will be advanced using a CME-75 drill ng equipped with 8 25-inch hollow-stem <br /> augers One deep soil boring will be advanced to 90 feet bsg on the west side of the former UST pit <br /> One shallow boring will be advanced to 25 feet bsg on the east side of the former UST pit and two <br /> shallow borings will be advanced to 25 feet bsg, south of the east and west dispenser islands <br /> Relatively undisturbed soil samples will be collected in all borings using a California modified <br /> split-spoon sampler fitted with three 2-inch diameter, 6-inch long brass sleeves Upon removal from <br /> the sampler, the sample sleeves will be separated The exposed ends of a selected sleeve will be <br /> covered with Teflon sheets, capped and sealed with tape Each soil sample will be labeled with <br /> boring location, depth, time, date and sampler's initials following sample collection Soil samples <br /> will be placed in a chilled container under ice and transported under chain-of-custody to a DHS- <br /> certified Iaboratory <br /> Soils encountered in the borings will be visually classified by an AGE geologist in accordance with <br /> the Unified Soil Classification System (USCS) Additionally, soil samples will be field screened for <br /> the presence of volatile organic compounds using an organic vapor meter equipped with a <br /> photo-ionization detector (PID Thermo Environmental 580A, 10 0 eV, calibrated to isobutylene) <br /> The field data will be recorded on logs for each boring <br /> 4 2 GROUND WATER SAMPLING <br /> For the collection of a ground water sample, the deep soil boring will be advanced to the top of the <br /> ground water table as identified by collection of a saturated soil sample Once ground water has been <br /> encountered, a disposable plastic bailer will be placed down the center of the augers to collect water <br /> Ground water samples will be collected into four 40-m1 VOA vials containing 0 5 ml hydrochloric <br /> acid as sample preservative The labeled sample containers will be placed under ice in a chilled <br /> container and transported under chain-of-custody to a DHS-certified analytical laboratory <br /> Advanced GeoEnvironmentai,Inc <br />