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Petroleum hydrocarbons were detected in samples collected from monitoring wells MW-2,MW-2A,MW- <br /> 3A,and MW-6 Levels ofbenzene, ethylbenzene,and total xylene were detected in monitoring wells MW-2 <br /> and MW-2A <br /> I <br /> TPH-g and BTEX compounds were not detected in the upgradient monitoring well MW-9 TPH-g,BTEX, <br /> MTBE,DIPE,ETBE,TAME,and TBA were not found in the holding tank sample(H-Tank) Benzene was <br /> detected in the equipment blank water sample (EB-1) This detection is likely due to cross contamination <br />' Table 3-2 <br /> Organic Analytical Results <br />' San Joaquin County Human Services Agency <br /> December 2004 <br /> Results presented in micrograms per liter(µg/L) <br />' Well Groundwater Benzene Toluene Ethylbenzene Xylene TPH-g <br /> Elevation(feet (total) <br /> MSL <br /> MW-2 NM 8,900 ND(0 50) 100 ND(0 50) 15,000 <br /> MW-2D NM 8,700 ND(0 50) 110 ND(0 50) 14,000 <br />' (duplicate of <br /> sample MW-2) <br /> MW-2A -2064 78 ND(0 50) 93 94 2,000 <br /> MW-3A -2070 ND(0 50) ND(0 50) ND(0 50) ND(0 50) 52 <br /> MW-4 -1976 ND(0 50) ND(0 50) ND(0 50) ND(0 50) ND(50) <br /> ' MW-5 -1845 ND(0 50) ND(0 50) ND(0 50) ND(0 50) ND(50) <br /> MW-6 -1933 ND(0 50) ND(0 50) ND(0 50) ND(0 50) 60 <br /> ' MW-7 -2111 ND(0 50) ND(0 50) ND(0 50) ND(0 50) ND(50) <br /> MW-8 -2098 NM NM NM NM NM <br /> ' MW-9 -2066 ND(0 50) ND(0 50) ND(0 50) ND(0 50) ND(50) <br /> EB-1 NA 25 ND(0 50) ND(0 50) ND(0 50) ND(50) <br /> NA=not applicable <br /> ' ND( analyte not detected,detection hnut indicated in parentheses <br /> NM=not measured <br /> ' 4.0 CONCLUSIONS <br /> Since the previous sampling event of September 2004,concentrations of benzene,toluene,and TPH-g have <br /> fallen slightly in monitoring well MW-2, xylene was detected in third quarter sampling but was not found <br /> to the current data set Concentrations of ethylbenzene,xylene, and TPH-g found in monitoring well MW- <br /> 2A, have increased slightly when compared to the last data set in September 2004, benzene levels have <br /> ' decreased slightly and toluene was not detected in the current round of sampling These concentrations are <br /> consistent with historic concentrations found in previous sampling events and represent minor fluctuations <br /> in contaminant levels No contaminants of concern were detected in upgradient well MW-9 <br /> ' 4 <br />