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12 December 1995 AGE-NC Project No. 95-0184 Page 4 of 6 5. Boring MW-7 will be instailed near the southeast corner of the parking area approximately 60 feet west of tank B. Boring MW-8 will be drilled inside the building at 825 Miner Avenue approximately 90 feet east of MW-1. Boring MW-9 will be drilled in the sidewalk approximately 90 feet east of MW-4. Boring MW-10 will be drilled in the parking lane on the south side of Miner Avenue approximately 90 feet southeast of MW-4. Borings MW-7 through MW-10 will be advanced to a depth of approximately 62 feet. 6. Decontaminate sampling equipment in an Alconox solution and rinse with water prior to each sampling run. 7. Collect soil samples at 5-vertical-foot intervals. Samples will be collected using a split spoon sampler loaded with three pre-cleaned, 2 by 6-inch brass sleeves. 8. Preserve soil samples in the lead sleeve by covering both ends with Teflon or aluminum sheets, capping and sealing with tape. 9. Label and log samples on a chain-of-custody form. 10. 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 and diesel (TPH-g, TPH-d) and volatile aromatics (benzene, toluene, ethylbenzene and xylenes; BTE&X) in accordance with EPA methods 8015m and 8020, respectively. 11. Analyze selected soil samples for physicochemical properties, general microbiological enumeration and selective enumeration (to assess feasibility of bioremediation). 12. Monitor auger returns and soil sample duplicates for the presence of volatile organics using a photo-ionization detector (PID) pre-calibrated to isobutylene. 13. Log auger returns and soil sample duplicates in accordance with the Unified Soil Classification System. 14. Place auger returns in 55-gallon DOT drums and store on-site pending analytical results of soil samples. 15. Complete borings VW-1 through VW-4 as vadose-zone cluster wells. The actual screen intervals will be determined from PID measurements and field observations. Bentonite plugs will be installed to separate screen intervals. A typical cluster well design is illustrated in Figure 3. 16. Complete borings MW-5 and MW-6 as combination ground water monitoring vadose-zone wells. The screen interval will extend from approximately 13 feet below the water level to approximately 17 feet above ground water. Additional screen intervals may be added using the design illustrated for a typical cluster well (Figure 3). Bentonite plugs will be used to separate screen intervals.