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tT} _ WMA 11RZCjA . 1 Working To Restore Nature 1710 Main Street E Escalon, CA 95320 Phone: (209) 838-3507 FAX: (209) 838-3509 March 1, 1994 Ms. Mary Meays San Joaquin County Public Health Services Environmental Health Division P.O. Box 2009 Stockton, CA 95201 Subject: Additional Subsurface.Investigation Site,Code 1178, Stockton Police Facility 22 East Market Street,' Stockton, California Dear Ms..Meays: This letter report is submitted to summarize activities associated with the additional subsurface _ investigation at the above referenced site (Figure 1). These activities include the advancement - of shallow soil borings for sample collection -to.. investigate potential residual petroleum hydrocarbon contamination associated with the former underground,gasoline storage tank. This work was performed in.response to a request.by the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD). BACKGROUND During,precision testing.at the facility'(May 1988), leakage was detected from the product line of a 10,000 gallon Unleaded tank. Elevated levels. of gasoline hydrocarbons were recorded in. two of four soil samples.collected June 9, 1988 from a trench located-adjacent to the product lines. Althoughindividual testing of the tanks indicated that they were mathematically,tight, a small hole was found.in the unleaded product line in the.area of highest contamination. Based upon these leak indicators PHS/EHD required further investigation to assess the extent of G contamination. On October 19, 1989, a soil boring was drilled to a total depth of 55 feet below grade to determine the vertical extent of hydrocarbon impacted soils and to!facilitate the installation of 1 a groundwater monitoring well'(MW1). The'bonng/moh toriug well was. located -as close as possible to the area of suspected soil contamination near the product line. O W 0148%ReportslLR-20294.FNL