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Table 3-2 <br /> Organic Analytical Results <br /> San Joaquin County Human Services Agency <br /> 2 March 2000 <br /> Well Groundwater Benzene Toluene Etylbenzne Total <br /> ' <br /> Elevation (,ug/L) (,Ug/L) WWI-) TPH-G MTBE <br /> g )(feet) W /L) (/µg/L) (ug/L) <br /> MW-2 NM 15,000 61 11800 <br /> 2,000 27,000 NA <br /> MW-2A -1494 38 45 29 <br /> 64 950 ND <br /> MW2A(DUP) -1494 43 50 33 <br /> S 1 1,100 ND <br /> MW-3A -1502 056 ND ND <br /> 16 310 ND <br /> MW-4 -1440 ND' ND ND ND ND NA <br /> MW-6 -1340 37 059 ND <br /> ND 51 NA <br /> MW-7 -1524 13 ND ND <br /> ND ND NA <br /> MW-9 -1499 ND ND ND (0 5) ND (0 5) ND {50} ND <br /> (0 5) (0 5) (2 0) <br /> Notes ND(0 5) =Analyte not detected,detection limit indicated to parentheses <br /> NM = Not measured <br /> NA = Not analyzed for this constituent <br /> 4.0 CONCLUSIONS <br /> Concentrations of petroleum hydrocarbons decreased in source area wells MW-2 and MW-2A <br /> Benzene, toluene, ethylbenzene and total xylenes (BTEX) concentrations in MW-2 and MW-2A <br /> were detected at concentrations slightly above the concentrations detected in the first quarter 2001 <br /> These detections are likely due to the seasonal rise in the water table that Occurred during this <br /> quarter Groundwater flows into a trough and then to the northeast with a horizontal gradient of <br /> 0 0018 ft/ft <br /> Petroleum hydrocarbons concentrations have slightly decreased or remained the same in samples <br /> from MW-3A and MW-6 since the last sampling (November 2000) Low benzene concentrations <br /> were detected in MW3-A, MW-6, and MW-7 A low concentration of toluene was detected in <br /> MW-6, and total xylenes were found in MW-3 Possible interpretations for such detection may <br /> include contaminant migration through dispersion, contamination pulled into the well during <br /> purging and sampling, contaminated laboratory glassware and/or instruments These possibilities <br /> will be further evaluated during future monitoring events <br /> IL\PR0JECTSNSANI0QIHSA000IRPT WPD 5 <br />