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' 02 March 2005 i AGE-NC Project No 97-0333 Page 4 of 10 r r in Appendix A, GeoTracker confirmation pages of the submitted laboratory electronic deliverable format (EDF) files are Included in Appendix B 1 Utilizing a Blue-White Industries F-2000 flow meter, total flow (totalizer) was recorded between 15 September and 30 December 2004 (Table 1) During this time, the extraction and treatment ,interim ground water remediation system was in operation for approximately 106 days Based on the total of approximately 300,491 gallons of water recorded during this time, AGE estimated that an average 2,835 gallons of water were discharged per day during this time 2 6 MASS-VOLUME REMOVAL CALCULATIONS Between 15 September and 30 December 2004, an estimated 6 0 pounds of MTBE was extracted r from ground water(Table 1), since the system was initiated on 21 January 2002, a total mass of 257 pounds of MTBE has been removed The September to December 2004 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 On 30 December 2004, 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 30 December 2004, 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 level 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 (Figures 4 through 7) ' Advanced GeoEnvironmental,Inc