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k` 08 September 2005 ` AGE-NC Protect No 97-0333 Page 4 of 11 format (EDF) files are included in Appendix B Utilizing a Blue-White Industries F-2000 flow meter, total flow (totalizer) was recorded between 30 December and 15 March 2005 (Table 1) Dunng'this time,the extraction and treatment interim ground water remediation system was in operation for approximately 75 days Based on the total of approximately 286,020 gallons of water recorded during this time, AGE estimated that an average ' 3,814 gallons of water were discharged per day during this time 26 MASS-VOLUME REMOVAL CALCULATIONS Between 30 December 2004 and 15 March 2005, an estimated 3 0 pounds of MTBE was extracted from ground water(Table 1), since the system was initiated on 21 January 2002,a total mass of 260 pounds of MTBE has been removed The December 2004 to March 2005 mass-volume calculations of MTBE-impacted ground water extracted from the ground water extraction and treatment system are presented in Appendix C Plots of cumulative ground water pump and treat mass removal trends and influent ground water MTBE concentrations versus time are included in Appendix D 3.0. GROUND WATER MONITORING AND SAMPLING Between 31 March and 01 April 2005,ground water monitoring and sampling were performed at 47 ground water monitoring points (MW-1 through MW-13) Quarterly ground water monitoring procedures for the site were outlined in the AGE-prepared Work Plan Addendum, dated 03 April 2002 and approved by the San Joaquin County Environmental Health Department(EHD)in a letter dated 12 April 2002 As-built monitoring well construction details are summarized in Table 3 3 1 WELL MONITORING AND PURGE PROCEDURES ! On 31 March 2005, the depth to ground water was measured at each monitoring well from the top of each well casing to the nearest 0 01-foot utilizing a Solinst water Ievel meter The ground water ' elevation in each monitoring well was calculated by subtracting the measured depth to ground water from the surveyed casing elevation(Table 4) Ground water elevation and vertical gradient data for wells MW-11, MW-12, and MW-13 are depicted in cross section F-F' (Figure 3), ground water ' elevations were plotted in plan view for the informal First Zone, Second Zone, Third Zone, and Primary Aquifer Zone hydrogeologic flow units as defined in AGE's Cone Penetrometer Testing Site Investigation - Fourth Quarter 2000, dated 07 February 2001 (FiguresV4 through 7) On 31 March and 01 April 2005,approximately 6 to 13 gallons of ground water a minimum of three ! Advanced GeoEnvironmental,Inc