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1 Petroleum hydrocarbons,benzene,toluene,ethylbenzene,and total xylenes TEX were detected <br /> • Y (B } n samples <br /> collected from MW-2 and MW-2A MTBE was not found in the holding tank water sample Petroleum <br /> hydrocarbons,benzene,toluene,and ethylbenzene compounds were not detected in the samples collected <br /> from MW-9, however there was a slight detection of total xylenes Petroleum hydrocarbons and BTEX <br />' compounds were not detected in the holding tank, nor the equipment blank <br />' Table 3-2 <br /> Organic Analytical Results <br /> San Joaquin County Human Services Agency <br />' September 2442 <br />' Well Groundwater Benzene Toluene EthyIbenzene Total TPH- MTBE <br /> Elevation(feet) (Azg/L) (ug/L) (µg/L) Xylene G (/,9/L) <br />' MW-2 NM 13,000 34 140 300 14,000 NA <br /> MW- -1784 59 74 110 13 1,400 NA <br />' 2A <br /> MW-9 -1792 ND(o 50) NII(o So) ND (o 5o) 074 ND NA <br /> • (50) <br /> H-Tank NA ND(o so) ND(050) ND (o 50) ND(050) ND ND <br /> (50) <br />' EB-I NA ND(0 50) ND(o so) ND (050) ND(o so) ND rNA <br /> (50) <br />' Notes NA Non applicable <br /> ND (0 5) Analyte not detected, detection limit indicated in parentheses <br /> NM Not measured <br />' NS Not sampled during this quarter <br /> (ug/L) Micrograms per liter <br />' 40 CONCLUSIONS <br />' Since the last sampling event(June 2002),concentrations of total petroleum hydrocarbons slightly increased <br /> in source area wells MW-2 and MW-2A Benzene concentrations also slightly increased in MW-2 and MW- <br /> 2A Ethylbenzene concentrations continue to decrease in MW-2,however MW-2A showed a slight detection <br /> Low concentrations of toluene were detected in MW-2 and MW-2A Total xylenes concentrations <br />' significantly decreased in MW-2 and were slightly detected in MW-2A Low total xylene concentrations were <br /> found in upgradient MW-9 this quarter and were not detected in the previous sampling round These <br /> concentrations were detected slightly above the detection Iimit and will be monitored during future sampling <br />' No contaminants of concern were found in the holding tank or the equipment blank <br />' L\PR0JECTMANJMHSAl2QD3RPT WPD 5 <br />