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Ir <br /> 1 <br /> Ms. Donna Heran - 2 - <br /> Given <br /> 2 -Given these facts, I believe that an expanded investigation to define more precisely the vertical <br /> and lateral extent of residual,naturally-declining, low part per billion petroleum concentrations <br /> in shallow groundwater would provide no additional water quality benefit. <br /> If the results of four additional quarters of sampling of the existing monitoring network remain <br /> consistent with existing spatial and time-series trends, I will be prepared to recommend closure <br /> to the SWRCB if San Joaquin County has not already taken that action. If you have any <br /> questions,please call me at (916) 227-4428. <br /> Sincerely, <br /> Edward C. Anton, Chief <br /> Division of Clean Water Programs <br /> Enclosure <br /> cc: Mr. Gary Carlton, Region 5 <br /> Central Valley Regional Water Quality Control Board <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3098 <br /> Mr. Robert Boust <br /> Unocal <br /> 2121 North California Boulevard <br /> Walnut Creek, CA 94596 <br /> California Environmental Protection Agency <br /> �d Recycled Paper <br /> _ J <br />