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' nor the equipment blank water sample Low levels of benzene,ethylbenzene,and xylenes were detected <br /> . Y in <br /> the water sample collected from the holding tank Possible interpretations for such detection maybe the result <br /> of residual cross contamination from the drums This possibility will be further evaluated during the next <br /> sampling event According to the San Joaquin county self monitoring program, the levels are below the <br />' discharge limits, therefore the holding tank wastewater still meets the requirements for discharge to the <br /> sanitary sewer under permit <br /> Table 3-2 <br /> Organic Analytical Results <br /> San Joaquin County Human Services Agency <br /> March 2003 <br /> 1 Well Groundwater Benzene Toluene Eth Ibenzene Total <br /> Y TPH- <br /> Elevation(feet) (pg/L) (,uglL) (E,cg/L) Xylene (,ug/L <br /> (j1/-) <br /> MW-2 NM 13,000 ND(50) 1,200 1,900 30,00 <br /> MW-2A -18 09 30 3 3 48 86 1,400 <br /> MW-9 -1819 ND(o so) ND(o so) ND(o sod ND(o so) ND <br /> (so) <br /> Holding Tank NA 11 ND(o�) 14 16 ND <br /> (50) <br /> EB-1 NA NDLO so NDLO so ND(050) ND so ND(50)11 <br />' Notes NA Non applicable <br />' ND (0 5) Analyte not detected, detection limit indicated in parentheses <br /> NM Not measured <br /> WgV Micrograms per liter <br />' 4.0 CONCLUSIONS <br />' Since the last sampling event(December 2002),concentrations of total petroleum hydrocarbons remained <br /> stable in source area wells MW-2 and MW-2A Benzene and ethylbenzene concentrations in MW-2 were <br /> detected at concentrations slightly above the concentrations detected in the last sampling quarterly event, <br /> however concentrations decreased in MW-2A Toluene was slightly detected in MW-2A Total xylenes were <br /> found in MW-2 and MW2-A during this sampling event and were not detected in the fourth quarter sampling <br /> event These detections are likely due to the seasonal rise in the water table that occurred during this quarter <br /> No contaminants of concern were detected in MW-9 , or the equipment blank <br /> i <br /> I.1PRC7J1;M1SANl0111HSA11Q01RP1 WD <br />