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' Petroleum hydrocarbons were detected in samples collected from�tvm-2,MW-2A,MW-3A,MW-6,and <br /> MW-7 Low levels of benzene,ethylbenzene,and total xylene were detected in MW-2, MW-2A,and MW- <br />' 7 Toluene was slightly detected in MW-2A,and MW-7 Petroleum hydrocarbons,benzene,toluene,total <br /> xylene, and ethylbenzene(BTEX)compounds were not detected in the samples collected from MW4,MW- <br /> 9, the holding tank water sample, nor the equipment blank water sample <br /> Table 3-2 <br /> Organic Analytical Results <br /> San Joaquin County Human Services Agency <br /> .Tune 2003 <br /> Well Groundwater Benzene Toluene Ethylbenzene Total TPH-G MTBE <br /> Elevation (µg/L) (µg(L) (,ug/L) Xylene (E.cgIL) <br /> (feet) I (11191L) <br /> MW-2 NM 11,000 ND(100) 680 860 25,000 NA <br /> MW-2D NM 11,000 ND(100) 600 740 24,000 NA <br /> (duplicate <br /> of MW-2) <br /> MW-2A -1812 25 35 11 38 1,300 INA <br /> MW-3A -1812 ND(050) ND(0 50) ND(0 50) ND(050) 120 NA <br />' MW-4 -1744 ND(0 50) ND(0 50) ND(0 50) ND(0 50) ND(50) NA <br /> MW-6 -1680 ND(0 50) ND(05o) ND(0 50) ND(0 50) 72 NA <br />' MW-7 -1856 13 12 10 3 1 82 NA <br /> MW-9 18 11 ND(0 50) ND(0 50) ND(0 50) ND(0 50) ND(50) NA <br /> Holding NA ND(0 50) ND(0 50) ND(0 50) ND(0 50) Nn(50) ND(2 0) <br /> Tank <br /> EB-1 NA ND50) ND(050) ND ND ND 50, NA <br /> Notes NA Non applicable <br />' ND(0 5) Analyte not detected, detection limit indicated in parentheses <br /> NM Not measured <br /> (µg/L) Micrograms per liter <br /> 1 <br /> 4.0 CONCLUSIONS <br />' Since the last sampling events (December 2002 and March 2003), concentrations of totalp etroleum <br /> hydrocarbons decreased in source area wells MW-2 and MW-2A Petroleum hydrocarbons remained stable <br /> LNPR01RCIS1SAN]0Q\HSA\1Q03RPT WPD 5 <br />