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r <br /> SWFN <br /> ENVIRONMENTRLTECHNOLOGIESCORPORATION <br /> 0 3 <br /> May 8, 1996 <br /> 94-326 <br /> Ms Mary Meays - - <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 388 <br /> Stockton, CA 95201-0388 <br /> -fr <br /> Subject Groundwater Monitoring Report,January through March 1996,26080 Thornton Road, <br /> Thornton, CA, Site Code 1864 <br /> Ms Meays <br /> This letter report summarizes <br /> p groundwater monitoring activities conducted by Smith Environmental <br /> Technologies Corporation at the subject site(Figure 1) <br /> BACKGROUND <br /> On September 6, 1989, three underground gasoline storage tanks were removed at the project site by <br /> Western Meter Service of Stockton, Califoriva Soil samples were collected beneath each tank and the <br /> associated piping Soil samples collected from beneath two of the tanks contained moderate to high <br /> levels of ethylbenzene and xylenes (1 2 to 70 parts per million [ppm]) as well as total petroleum <br /> hydrocarbons as gasoline (TPHg), at 470-830 ppm <br /> Due to the presence of elevated concentrations of petroleum hydrocarbons in the tank pit soil samples, <br /> further investigation was required by San Joaquin County Public Health Services, Environmental <br /> Health Division(PHS/EHD) - Ir I ' ' <br /> k;s,-A %J. x, t <br /> In a two-phased approach beginning on November"1, 1990, RESNA personnel advanced six soil <br /> bonngs (MW1-MW6) to depths ranging from 27 to 30 feet below grade at the protect site to <br /> accomplish the following 1) define the lateral and vertical extent of hydrocarbon impacted soils, 2) <br /> determine soil stratigraphy, and 3) install groundwater monitoring wells within the uppermost aquifer <br /> in order to assess groundwater quality The boring/well locations are plotted on Figure 2 Field <br /> methodology and analytical results are discussed in detail in RESNA's Interim Problem Assessment <br /> Report, dated January 13, 1992 <br /> The site's station building and garage were demolished in Decembet 1994, in part to facilitate the <br /> of removal of hydrocarbon contaminated soil which is suspected beneath the station building The <br /> demolition of the station building was requested in PHS/EHD correspondence dated July 7�1994 A <br /> w 1943261QUARTLYIIQR-1996 DOC i <br /> 1260 Graphics Drive - Modesto, CA 95351-1502 - (209)579-2221 - Fax(209)579-2225 <br /> Engineering - Consulting - Remedration - Construction <br />