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r 19 November 1999 AGE-NC Project No. 99-0604 Page 7 of 10 4.1. SOIL SAMPLING PROCEDURES Soil borings will be advanced using hollow-stem auger drilling techniques. Relatively undisturbed soil samples will be collected in all 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 sleeve will be separated with a clean knife. The exposed ends of the second sleeve will be covered with Teflon sheets, capped and sealed with tape. Each soil sample will be labeled with boring location, depth, time, date and sampler's initials following sample collection. Soil samples will be placed in a chilled container under ice and transported under chain-of-custody to a DHS-certified laboratory. 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 equipped with a photo- ionization detector(PID: Thermo Enviromental 580A, 10.0 eV, calibrated to isobutylene). The field data will be recorded on logs for each boring. 4.2. IN-SITU GROUND WATER SAMPLING PROCEDURES For the collection of depth-discrete ground water samples, soil borings will be advanced to the top of the ground water table as identified by collection of a saturated soil sample. Once ground water has been encountered, a disposable bailer will be placed down the center of the augers to collect water. Samples for TPH-g, BTEX, and fuel oxygenate analyses will be collected into laboratory- supplied,40-m1 VOA vials containing 0.5-m1 hydrochloric acid as sample preservative. The labeled sample containers will be placed under ice in a chilled container and transported under chain-of- custody to a DHS-certified laboratory. 4.3. MONITORING WELL INSTALLATION PROCEDURES Monitoring well pilot borings will be advanced using hollow-stem auger drilling techniques. Relatively undisturbed soil samples will be collected at five-foot intervals in each of the borings using a California modified split-spoon sampler loaded with 2-inch diameter, 6-inch long brass sleeves. Soil sample handling will be consistent with the procedures presented in Section 4.2. Following completion of drilling the boring, a 2-inch diameter Schedule 40 PVC 0.010-inch slotted well screen and casing will be installed. Twenty feet of screen will be installed in each well, extending approximately 15 feet below and 5 feet above the top of the ground water table. The well casing, filter pack and sealing materials will be placed into the borehole through the interior AdvancedGeoEn ironmenlal,Inc.