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April 14, 1993 R <br /> NA <br /> ARCO Service Station No 2130, Stockton, California Working To Restore Nature <br /> WORK IN PROGRESS <br /> RESNA is currently evaluating remedial options for soil and ground water using the results <br /> of air sparging and vapor-extraction testing performed at the site We are also preparing <br /> a Problem Assessment Report <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The ground-water 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 samples from the seven wells at concentrations ranging from 67 to 1,800 ppb Benzene <br /> concentrations were detected above the MCL's in wells MW-1 through MW-5 Fecal <br /> coliform bacteria were not detected in the samples from the wells, however, total coliform <br /> bacteria were detected in wells MW-1, MW-3, MW-4, and MW-5 <br /> In our opinion, continued quarterly monitoring is warranted We understand that Emcon <br /> will conduct the next quarterly monitoring event in May 1993 We recommend that copies <br /> of this report be forwarded to Mr Michael Infurna of the San Joaquin Public Health <br /> Services, P O. Box 2009, Stockton, California 95201 and Mr James Mangham of the Central <br />. Valley Regional Water Quality Control Board, 3443 Routier Road, Sacramento, California <br /> 95827-3098 <br /> ig, 0302kchr <br /> 30003-9 3 <br />