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m u I I I , la iY i 1' r iI II h' ' IIS I „ rl I 4 Ir I I 4E I r rI's ,118alhApnl2003 rr w I' I, AGE-NC`Project No 97-0333', I f� I'll ' d 1 Page 4 o 11 II s 1 I I S ii I 11 November and 12'December 2002 for flow,rate and laboratory analysis of contaminants listed in I r Section 2 3 r Laboratory analysis'of of pump,and-treat effluent grab,water samples collected on 18'October, 11 I. A n r November, and 12 December 2002 did not detect any constrtue iso f concern except p MTBE at ai I, I concentration of 9µg/1 during the December 2002 event,no other target analytes were detected The I I' pump-and-treat syst,Ieffluent was rersampled on 02 January 2003 and the laboratory reported non- detectable levels of MTBE (less''than 0 5 pg/l) Analytical results are summarized in Table 1,� F I ;Ili' I I laboratory reports are in Appendix Ar'` r EI I I'i I II � I II � I �I ` r Utilizing a Blue-White Industries F-2000 flow meter,total flow,(totalizer)was recorded lietweenE 26 r I Irl [ September and 12� December 2002, (Table 5) During this time, the pump'-and-treat interim 'I I , l remediation system was m operation for approximately 77 days Basedfon 278,64`0 gallons of water rh I I recorded during this time,AGE estimated that'an average 3,619 gallons of water was discharged per E'r hi day'dunrig this time I I I ' 2 6, MASS-VOLUME REMOVAL CALCULATIONS r f lBetwe6n 26 September and 12 December 2002,an estimated 22 94 pounds of MTBE was extracted I from ground water'(Table 5), since the system was•mrtiated on 21 January 2002, a,total mass of, f 189 31 pounds of MTBE has been removed The September to December 2002 mass-volume " calculations of MTBE-impacted ground water extracted from the ground water pump-and-treat' + system are presented in Appendix B Plots of cumulative ground watenpump acid treat mass removal trends and influent ground water MTBE concentra'tions versus time are in Appendix'C 3.0. GROUND WATER MONITORING AND SAMPLING I I ' I On'1t0, 11 and 12 November 2002, ground water monitonng and sampling were performed at 47 ! ground water monitoring wells (MW-1 througli MW-13) Quarterly ground water'monitoring procedures for the site were outlined in the AGE-prepared Work Plan Addendum, dated 03 April ' + 2002;'prepared by,AGE and approved by San Joaquin County Environmental Health Department I ' (SJCEHD) by letter dated 12 April 2002 I' As-built monitoring well construction details 'are i f III I summarized in Table 6 I I E t itf r' r n I II ryl I I df II i � I ''r r l I I', h I ' I I I A(IVQ71C@d GCUEIIYIPOI1fIlEI1[ar,Inc I r I I 1 4 4 I 1 11 � I I , f � i lr I I S I it roll li, Ir II ft rlln