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1 1 <br /> J <br /> ' 05 January 2004 <br /> AGE-NC Project No 97-0333, <br /> Page 4of11 <br /> 1 <br /> ' format (EDF) files are included in Appendix B <br /> Utilizing a Blue-White Industries F-2000 flow meter,total flow(totalizer)was recorded between 23 <br /> June 2004 and 15 September 2004(Table 5) During this time,the extraction and treatment interim <br /> ground water remediation system was in operation for approximately 84 days Based on the total of <br /> approximately 93,812 gallons of water recorded during this time, AGE estimated that an average <br /> ' 1,117 gallons of water was discharged per day during this time <br /> ' 2 6 MASS-VOLUME REMOVAL CALCULATIONS <br /> Between 23 June and 15 September 2004, an estimated 4 43 pounds of MTBE was extracted from <br /> ' ground water (Table 2), since the system was initiated on 21 January 2002, a total mass of 251 ; <br /> pounds of MTBE has been removed The June 2004 to September 2004 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 in Appendix D <br /> 3.0. GROUND WATER MONITORING AND SAMPLING <br /> 1 <br /> On 04-05 October 2004,ground water monitoring and sampling were performed at 46 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, prepared by <br /> ' AGE and approved by San Joaquin County Environmental Health Department(SJCEHD)by letter <br /> dated 12 April 2002 As-built monitoring well construction details are summarized in Table 3 <br /> 1 <br /> 3 1 WELL MONITORING AND PURGE PROCEDURES <br /> On 04 October 2004,the depth to ground water was measured at each monitoring well from the top <br /> of each well casing to the nearest 0 01-foot utilizing a Solinst water level meter The ground water <br /> ' 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 /> Pnmary 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 04 and 05 October 2004, approximately 13/4 to 3'/� gallons of groundwater(a minimum of three <br /> ' Advanced GcoEnvironmental,inc <br /> 1 <br />