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18 December 1997 AGE-NC Project No 95-0173 Page 2of10 stage submersible pump Temperature, pH and conductivity (field parameters) were measured at regular intervals utilizing an ICM model 52200 water analyzer to track stabilization of produced water Dissolved oxygen was measured at each well using a YSI Model 55 Dissolved Oxygen Meter following stabilization of field parameters Stabilization data and field logs are contained in Appendix A Dissolved oxygen field measurements are summarized in Table 2- Summary of Dissolved Oxygen Measurements Purged ground water was stored in 55-gallon drums on-site In an area lacking public access Monitoring wells MW-1 through MW-9, VW-1 and VW-2 were allowed to recover for a minimum of one hour prior to sample collection Ground water samples were collected utilizing a dedicated, disposable polyethylene bailer and new nylon rope Sufficient sample was collected from each well to fill three 40-m1 EPA vials containing 0 5 ml 18% hydrochloric acid as a preservative, and one I- liter amber bottle Care was taken to ensure that visible air bubbles were not present in the VOAs after filling and capping Ground water sample containers were labeled with the well designation, date, time, and samplers initials Following collection, each sample was logged on a chain-of-custody form, placed in a chilled 10 container and transported to Castle Analytical Laboratories (CAL), a California state-certified laboratory for analysis by EPA Method 8015-m for total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPII-d), by EPA Method 8020 for volatile aromatics (benzene, toluene, ethylbenzene and xylenes BTE&X) with methyl-tertiary butyl ether (MTBE), and by EPA Method 8260 for tertiary butanol (TA),di-isopropyl ether(DI PE), ethyl tert butyl ether(MTBE) and tert amyl methyl ether(TAME), and to confirm and quantify any MTBE detected by EPA Method 8020 The results of the analysis are contained in Table 3 - Analytical Results Of Ground Water Samples 23 DRILLING ACTIVITIES NOVEMBER 1997 ' On 03 and 04 November 1997, two soil boringsAwl and 1'4W2)were adva ced on-sit as part of ongoing site assessment activities of the former UST area Soil borings)RWI and W2 were advanced vertically to maximum depths of 85 feet below surface grade(bsg) utilizing a B-60 truck- mounted drill rig equipped with 8-Inch and 10-inch diameter hollow stem augers 2 3 1 SOIL SAMPLE COLLECTION Discrete soil samples were collected at 5-foot Intervals, beginning at 20 feet bsg, utilizing a California split-spoon sampler loaded with 2-inch by 6-inch brass sleeves The sampler was driven ' advanced GcoEnvironmental,Inc