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12 December 2005 <br /> AGE-NC Project No 97-0333 <br /> Page 4 of 11 <br /> format (EDF) files are Included in Appendix B <br /> Utilizing a Blue-White Industries F-2000 flow meter, total flow (totalizer) was recorded <br /> betweenl5 March 2005 and 08 June 2005 (Table 1) During this time,the extraction and treatment <br /> Interim ground water remediation system was in operation for approximately 85 days Based on the <br /> total of approximately 331,560 gallons of water recorded during this time, AGE estimated that an <br /> ' average 3,900 gallons of water were discharged per day during this time <br /> ' 26 MASS-VOLUME REMOVAL CALCULATIONS <br /> Between 15 March 2005 and 08 June 2005, an estimated 4 71 pounds of MTBE was extracted from <br /> ground water (Table 1), since the system was Initiated on 21 January 2002, a total mass of 265 <br /> pounds of MTBE has been removed The 15 March 2005 to 08 June 2005 mass-volume calculations <br /> of MTBE-Impacted ground water extracted from the ground water extraction and treatment system <br /> ' are presented in Appendix C Plots of cumulative ground water pump and treat mass removal trends <br /> and influent ground water MTBE concentrations versus time are included in Appendix D <br /> 3.0. GROUND WATER MONITORING AND SAMPLING <br /> ' On 05 and 06 July 2005,ground water monitoring and sampling were performed at 47 ground water <br /> monitoring points(MW-1 through MW-13) Quarterly ground water monitoring procedures for the <br /> ' site were outlined in the AGE-prepared Work Plan Addendum, dated 03 April 2002 and approved <br /> by the San Joaquin County Environmental Health Department(EHD)In a letter dated 12 April 2002 <br /> As-built momtoring`well construction details are summarized in Table 3 <br /> 3 1 WELL MONITORING AND PURGE PROCEDURES <br /> On 05 July 2005, the depth to ground water was measured at each monitoring well from the top of <br /> each well casing to the nearest 0 01-foot utilizing a Sollnst water level meter The ground water <br /> 1 elevation in each monitoring well was calculated by subtracting the measured depth to ground water <br /> from the surveyed casing elevation(Table 4) Ground water elevation and vertical gradient data for <br /> wells MW-11, MW-12, and MW-13 are depicted In cross section F-F' (Figure 3), ground water <br /> ' elevations were plotted in plan view for the Informal First Zone, Second Zone, Third Zone, and <br /> Primary Aquifer Zone hydrogeologic flow units as defined in AGE's Cone Penetrometer Testing Site <br /> Investigation -Fourth Quarter 2000, dated 07 February 2001 (Figures 4 through 7) <br /> ' On 05 and 06 July 2005,approximately 4 5 to 7 gallons of ground water a minimum of three casing- <br /> Advanced <br /> asin -Advanced GeoEnvironmental,Inc <br />