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r I <br /> � <br /> 76(Former BP)Service Station No..11193 S ECOR <br /> SJCEHD <br /> August 30,2007 <br /> Page 4 <br /> On January 18,20051-SECOR supervised the installation of two off-site groundwater monitoring <br /> wells (MW-11 and MW-12)to delineate the off-site down-gradient extent of the dissolved MtBE <br /> and TBA plume. MtBE wasidetected in two soil samples at a maximum concentration of 0.0065 <br /> mglkg. TBA, MtBE ethyl tertiary butyl ether(EtBE), and TAME were detected in groundwater <br /> from the off-site wells'at maximum concentrations of 120 pg/L (MW-12),2,800 pg/L(MW-12), <br /> 0.79 pglL (MW-11), and 24 pglL (MW-12), respectively. <br /> i <br /> L\BP-ARC0105 BP-COP Sites1111931Work Plans111193 Vertical Delineation WP.doc <br />