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-I*'September 1998 r: Y AGE-NC Project-No'. 98-0440 ' Page 5'of° 9 . : 3..1.5. Surveying'of Monitoring-Wells ; On,15, July 1998, a. California state-licensed"'survey engineer-from•Baumbach & Piazza, lnc. ' surveyed a ' fere e,point on the top of each ground water-monitoring well atthesite to the nearest,, 0.01-foot relative to the San Joaquin County-Bench Mark Datum 4 Z-39: The results:of the monitoring well survey are'contained in Table 2.-The surveying reporti(Baumbach&,Piazza Job No... .9797) is presented in Appendix B. ;3:1:6. Well Development On ;15 July 1.998, monitoring wells MW-1"through,MW-4 were developed.utilizing a two-stage ` ' submersible pump. Approximately 12 to'22 gallons of ground water were purged from each screened interval utilizing'a hand.bailer and a two stage•submersible pump. Ground water was purged.from .. each well until the water produced was'•essentially_sediment free.,,-Purged ground water was containerized in properly.labeled D.O T.-approved model'17H 557gallon drums and was stored on- site"in an area lackingpublic'access. I0 3.2. QUARTERLY MONITORING AND SAMPLING ACTIVITIES . 1 On 15,July 1998, quarterly ground water monitoring and sampling was performed from monitoring wells MW-1 through MW-4. Depths to ground water and;total well depths from MW-,i through',', MW=4 were measured to the'nearest 0.01-foot utilizing a Solinst water.level-meter'. The ground water ' elevations were calculated by subtracting`the.depth to ground water from the surveyed casing elevations''(Table.,2). Ground water elevations wereplotted and contoured on a-scaled site map '(Figure 9}, After water levels were measured',-a minimum'.4three:well volumes of groundwater was:purged.'' from wells MW-1 through MW4' uiilizing'a •hand•bailer"and a two-stage%submersible pump. Temperature;'pH and conductivity were measured'at regular purge volume intervals utilizing an ICM model 52200:water analyzer to track"stabilization of produced water.Stabilization data and,field logs are contairied'in Appendix C: Purged ground'water was stored-in 55-gallon drums on-site in anarea lacking.public-access. ; The ground water levels from monitoring wells MW through MW 4 achieyed,a.minimum of 80 percent .recharge, prior to sample collection.: Ground water' samples 'were collected utilizing disposable" polyethylene.•bailers,. EPA-approved 40-m1 VOA vials containing 0.5 ml ' 18% hydrochloric acid as a sample preservative and"1-liter amber bottles:Caze was taken to ensure that visible air bubbles•were not present•in;the.VOAs after filling-and capping. Ground water sample , Advanced GeoEnvironmental,Inc. _