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i I31 October 2003 • AGE-NC Project No 01-0839 Page 3 of 7 I2 15 Monitoring Well Development On 31 July 2003, monitoring wells MW 1 through MW4 were developed utilizing a stainless steel Ihand bailer and an Inertia pump Ground water was purged from each monitoring well until ground water was visually sediment free Between six and seven gallons of water were removed from the wells Ground water temperature, pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer Field sheets and data are included In Appendix C Purged water was stored on-site in properly labeled, 55-gallon Department of Transportation (DOT)- approved drums 2 16 Well Head Survey On 26 September 2003, a California state-licensed survey engineer from Mid Coast Engineers surveyed the elevation at the top of the well casing of momtonng wells MW1 through MW4 to the nearest 0 01-foot relative to City of Stockton Bench Mark#191, surveyed at 32 40 feet above mean sea level(MSL) The results of the monitoring well survey are contained in Table 1 The surveying • report(Mid Coast Engineers) is presented in Appendix D 2 2 QUARTERLY WELL MONITORING PROCEDURES 2 2 1 Well Monitoring and Purging IOn 04 August 2003, the depth to ground water in all four monitoring wells was measured from the top of each well casing to the nearest 0 01-foot utilizing a Solinst water level meter Ground water Ielevation in each well was calculated by subtracting the measured depth to ground water from the surveyed casing elevation(Table 1) After water levels were measured,between 6 75 and 7 0 gallons of water(a minimum of 3 casing- water volumes per well)were purged from monitoring wells MW 1 through MW4 using dedicated, disposable plastic bailers Groundwater temperature,pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer Field sheets and data are included in Appendix C Purged water was stored on-site in properly labeled, 55-gallon Department of Transportation (DOT)-approved drums 2 2 2 Collection and Analysis of Ground Water Samples Advanced GeoEnvironmental,Inc I