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Petroleum hydrocarbons were detected in samples collected from MW-2 and MW-2A Low levels of <br /> iBenzene, ethylbenzene, and total xylene were detected in MW-2 and MW-2A Toluene was slightly <br /> detected in MW-2A but not found in MW-2 <br /> TPH-g and BTEX compounds were not detected in MW-9 Slight detections of benzene,ethylbenzene,total <br /> xylene,and petroleum hydrocarbons were detected in the equipment blank water sample This detection is <br /> likely due to cross contamination or a laboratory error <br /> Table 3-2 <br />' Organic Analytical Results <br /> San Joaquin County Human Services Agency <br /> October 2003 <br /> Well Groundwater Benzene Toluene Ethylbenzene Total TPH-G <br /> Elevation(feet) (,ug/L) G tg/L) Gig/L) Xylene Gug/l.) <br /> (,tg/1-) <br /> MW-2 NM 12,000 ND(Q 5) 160 ND(100) 25,000 <br /> MW-2A -1872 110 95 130 52 1,800 <br /> MW-3A —1872 NM NM NM NM NM <br /> MW-4 -1785 NM NM NM NM NM <br /> MW-5 -165 NM NM NM NM NM <br /> MW-6 -1736 NM NM NM NM NM <br /> IMW-7 -1906 NM NM NM NM NM <br /> MW-9 -1864 ND(a s) ND(o s) ND(o s) ND(o 50) NM <br /> EB-1 NA 42 ND,()s 12 1091 86 <br /> INotes 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 /> 4.0 CONCLUSIONS <br /> Since the last sampling event(January 2003),concentrations of TPH-g,benzene,and toluene remained fairly <br /> stable in source area wells MW-2 and MW-2A with minor variations Ethylbenzene concentrations detected <br /> LTRINFCTSISAN10Q1iiSA41Q6,RPT WPD 5 <br />