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19 January 1998 AGE-NC Protect No 96-0229 Page 4of8 relative ground water elevations were calculated by subtracting the depth to ground water from the ' surveyed casing elevations (Table 2) Ground water elevations were plotted and contoured on a scaled site map (Figure I i - Relative Ground Water Elevation Map) After water levels were measured, a minimum of three well volumes of ground water was purged from MW 1 through MW6 utilizing a two-stage submersible pump Temperature, pH and conductivity 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 the produced water Stabilization data and field logs are contained in Appendix C Dissolved oxygen field measurements are summarized ' in Table 3- 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 I through MW6, VW-I were allowed to recover for a minimum of one hour prior to sample collection Ground water samples were collected from each well utilizing a new, ' 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 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 container and transported to Castle Analytical Laboratories (CAL), a California state-certified laboratory for analysis by EPA Method 8015-m for TPH-g, by EPA Method 8020 for BTE&X with MTBE, and by EPA Method 8260 for TBA, DIPE, ETBE, TAME, and to confirm and quantify MTBE if detected by EPA Method 8020 The results of the analysis are contained in Table 4 - Analytical Results Of Ground Water Samples 1 ' 25 COLLECTION OF STOCKPILE SOIL SAMPLES On 17 December 1997, two soil samples were collected from MW1 through MW6 stockpiled soil cuttings utilizing a slide-hammer and brass sleeves under the supervision of the PHS-EHD The stockpile soil samples were submitted to Castie Analytical Laboratories fui oiie coiiipV—s,tc analysis of TPH-g, BTEX and MTBE in accordance with above mentioned EPA methods Analytical results ' of the composite soil sample analysis are summarized in Table 1 The laboratory report (Castle Analytical Laboratory Reference No 1378) and chain-of-custody are included in Appendix D Advanced GeoEnvironmenlai,Inc