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A«MA <br /> Working To Restore Nature <br /> 1710 Main Street `{ ` 2' 07 <br /> Escalon, CA 95320 <br /> Phone (209) 838-3507 <br /> FAX (209) 838-3509 <br /> March 1, 1994 <br /> Ms Mary Meays <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 2009 <br /> Stockton, CA 95201 <br /> Subject Additional Subsurface Investigation <br /> Site Code 1178, Stockton Police Facility <br /> 22 East Market Street, Stockton, California <br /> . Dear Ms Meays <br /> This letter report is submitted to summarize activities associated with the additional subsurface <br /> investigation at the above referenced site (Figure 1) These activities include the advancement <br /> of shallow soil bonngs for sample collection to investigate potential residual petroleum <br /> hydrocarbon contamination associated with the former underground gasoline storage tank This <br /> work was performed in response to a request by the San Joaquin County Public Health Services, <br /> Environmental Health Division (PHSIEHD) <br /> BACKGROUND <br /> During precision testing at the facility (May 1988), leakage was detected from the product line <br /> of a 10,000 gallon unleaded tank Elevated levels of gasoline hydrocarbons were recorded in <br /> two of four soil samples collected June 9, 1988 from a trench located adjacent to the product <br /> lines Although individual testing of the tanks indicated that they were mathematically tight, a <br /> small hole was found in the unleaded product line in the area of highest contamination Based <br /> upon these leak indicators PHSIEHD required further investigation to assess the extent of <br /> contamination <br /> On October 19, 1989, a soil boring was drilled to a total depth of 55 feet below grade to <br /> determine the vertical extent of hydrocarbon impacted soils and to facilitate the installation of <br /> a groundwater monitoring well (MW1) The bonnglmonitonng well was located as close as <br /> possible to the area of suspected soil contamination near the product line <br /> 0W01481ReportskLR-20294 FNL <br /> 13 � <br />