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i <br /> March 12, 1993 Working To Restore Nature <br /> ARCO Service Station No 2130, Stockton, California <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The groundwater flow direction has consistently been to the southeast since January 1992 <br /> The depth to ground-water has fluctuated since the previous quarter. TPHg was detected <br /> in water from the seven wells at concentrations ranging from 88 ppb to 11,000 ppb, and <br /> benzene was detected at concentrations above MCL's with the exception of the sample <br /> collected from well MW-6 In our opinion, continued quarterly monitoring is warranted <br /> We understand that Emcon will conduct the next quarterly monitoring event in February <br /> 1992 We recommend that copies of this report be forwarded to Mr Michael Infurna of the <br /> i San Joaquin Public Health Services, P O Box 2009, Stockton, California 95201 and Mr <br /> James Mangham of the Central Valley Regional Water Quality Control Board, 3443 Routier <br /> Road, Sacramento, California 95827-3098 <br /> i <br /> 1 <br />� i <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1• 1305kchr <br /> 30003-6 4 <br /> 1 <br /> 1 <br />