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09 July 1998 AGE-NC-97-0326 Page 4 of 6 4.0. PROCEDURES 4.1. DRILLING AND SAMPLING The following procedures will be performed for the installation of ground water monitoring wells: 1. Notify the PHS-EHD at least 48 hours prior to commencement of any work. 2. Mark boring locations at least 48 hours in advance for an Underground Service Alert (USA) check of underground utilities or pipes. 3. Advance two soil borings utilizing a truck-mounted drill rig and 8-inch diameter hollow stem augers. One boring will be advanced to a total depth of approximately 60 feet bsg; one boring will be advanced to a depth of approximately 25 feet bsg. Proposed boring locations are depicted on Figure 2. Borings may be advanced to greater depth, if necessary to define the vertical extent of impacted soil and ground water. 4. Decontaminate all sampling equipment in an Alconox solution and rinse with water prior to each sampling run. Steam-clean auger flights before advancement of each boring. 5. Collect soil samples at 5-foot intervals in each boring, beginning at a depth of 15 feet bsg in the boring adjacent to the UST and beginning at a depth of 5 feet bsg in boring near the dispenser island. Samples will be collected using a California split-spoon sampler loaded with three 2-inch by 6-inch brass sleeves. The sampler will be driven by dropping a 140- pound weight from a height of 30 inches. The number of blows required to advance the sampler in 6-inch increments will be recorded on the boring log. 6. Preserve soil in the lead sleeve by covering both ends with Teflon sheets, capping, and sealing with tape. 7. Label and log samples on a chain-of-custody form. 8. Store samples in a chilled container and transport to a state-certified laboratory for analysis. Selected soil samples will be analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g), for volatile aromatics (benzene, toluene, ethylbenzene and xylenes; BTE&X)and for oxygenates in accordance with the EPA Methods 8015m, 8020 and 8260. The PHS-EHD will have an opportunity to assist in selection of samples to be analyzed. 9. Monitor auger returns and soil sample duplicates for the presence of volatile organic compounds using an organic vapor meter equipped with a photo-ionization detector(PID) pre-calibrated to isobutylene. 10. Log auger returns and soil sample duplicates in accordance with the Unified Soil Classification System. Advanced GeoEmironmental,Inc.