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[ 1 f t I � ' 15 September 2003 ' t AGE-NC'Project No 97-0333 I Page 4 of 11 { 2 5 'EFFLUENT MONITORING RESULTS r n In accordance with the requirements of CMPWD Industrial Wastewater Discharge Permit No 02-1, �r monthly ground water pump-and-treat effluent monitoring was performed on 27 March, 15 April; I ' 14 May and 19 June 2003 for flow rate and laboratory analysis'of contaminants listed in Section 2 3 , 1 I 4 � ' Laboratory analysis ofpump-and-treat effluent grab water samples collected on 27 March, 15 April, < 14 May and 19, June 2003 did not detect any constituents of concern Analytical results are summarized in Table 1,; laboratory reports are in Appendix A �f I4q I I t i , i Utilizing a Blue-White Industries F-2000 flow meter,total flaw(totalizer)was recorded between 27 f March 2003 and 19 June12003 (Table 5) During this time, the pump-and-treat Interim remediation i system was in operation,for approximately 84 days Based on 231,275 gallons of water recorded �r r during this time, AGE estimated that an average 2,753 gallons of water was discharged per,day ' r n , during this time ' 1 2 6 MASS-VOLUME REMOVAL CALCULATIONS lie I I Between 27 March 2003 and 19 June 203,an estimated 10 89 pounds of MTBE was extracted from ground water(Table 5), since the system was initiated on 21 January 2002, a total mass of 208 56 pounds of MTBE has been removed The March 2003 to June 2003 mass-volume calculations of MTBE-impacted ground water extracted from the ground water pump-and-treat system are presented, I in Appendix B Plots of cumulative ground water pump and treat mass removal trends' and Influent ground water MTBE concentrations versus time are in Appendix C ' r 1 Y If S GROUND(WATER MONITORING AND SAMPLING On 05 and 06 June 2003,groundwater monitoring and sampling were performed at 47 groundwater ;,, ;114 monitonng"wells(MW-1 through MW-13) Quarterly groundwater monitoring!procedures for the F " site were outhned in the AGE-prepared Work Plan Addendum, dated 03 Apnl'2002, prepared by k,r ' I�f AGE and approved by San Joaquin County Environmental Health Department(SJCEHD)by letter dated 12 April 2002 As-built monitoring well;construction details are sumanarizedYin Table 6 31 � �;;,WELL MONITORING AND PURGE PROCEDURES � r On OS June 2003,'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 Solmst water level meter The ground water 'k F ' I'r , , r III If I I I1 II II I I I IY I ' � 1 I I �AI ,r 1 . IINtI l I I Advanced GeoEnwronImental,Inc �I u f s, I I r ff �r