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llft� N100011 <br /> Second Semiannual 2011 Groundwater Monitoring Report <br /> Former Texaco Service Station <br /> Chevron Site ID 309075 <br /> February 28, 2012 <br /> The groundwater samples collected from the site monitoring well network did not contain <br /> concentrations of toluene, ethylbenzene, total xylenes, MTBE, DIPE, ETBE, TAME, EDB, and <br /> ethanol or above their respective laboratory method detection limit (MDL). <br /> r <br /> 5.1.3 Remediation System Updates <br /> A remedial system is not associated with the site. <br /> 5.1.4 Plume Stability <br /> r <br /> Data gathered during the semiannual monitoring and sampling event indicates that the plume <br /> is stable. <br /> V <br /> Dissolved TPH-MO Distribution <br /> Concentrations of TPH-MO with SGC were detected above the laboratory MDL in the <br /> groundwater samples collected from site monitoring wells MW-2, MW-3, MW-4, MW-5, and <br /> MW-6D. <br /> Dissolved TPH-DRO Distribution <br /> A concentration of TPH-DRO with SGC was detected above the laboratory MDL in the <br /> groundwater sample collected from site monitoring well MW-6D. No other detections of <br /> TPH-DRO with SGC were reported. <br /> r <br /> Dissolved TPH-GRO Distribution <br /> A concentration of TPH-GRO was detected above the laboratory MDL in the groundwater <br /> sample collected from site monitoring well MW-1. No other detections of TPH-GRO were <br /> reported. <br /> r Dissolved BTEX Distribution <br /> A concentration of benzene was detected above the laboratory MDL in the groundwater sample <br /> collected from site monitoring well MW-6D. No other detections of benzene were reported. <br /> Concentrations of toluene, ethylbenzene and total xylenes were not detected above their <br /> respective laboratory MDLs in the groundwater samples collected from the site monitoring <br /> network. <br /> ... <br /> Dissolved MTBE, TBA, DIPE, ETBE, TAME, 1,2-DCA, EDB, Ethanol and Methanol <br /> Distribution <br /> Concentrations of 1,2-DCA and methanol were detected above the California Primary MCL in <br /> the groundwater samples collected from site monitoring wells MW-1 and MW-4, respectively. No <br /> other detections of 1,2-DCA and methanol were reported. A concentration of TBA was detected <br /> above the laboratory MDL in the groundwater sample collected from site monitoring well MW-1. <br /> Concentrations of MTBE, DIPE, ETBE, TAME, EDB, and ethanol were not detected above the <br /> laboratory MDL in the groundwater samples collected from the site monitoring well network. <br /> Concentration maps of the site are presented as Figures 4 and 5. Concentration versus time <br /> graphs for the wells in the site monitoring well network are presented as Figures 1 through 7 of <br /> Attachment G. <br /> V <br /> g:\aprojecl\env\chevronl309075\6 deliverables\periodic monitoring\2011\2sa11\teMppdt\text\309075 2sa11 gmr tin 02282012.doc 6 <br /> v <br />