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SWFNrrI t <br /> ENVIRON MENTAL TECHNOLOGIES CORPORATION <br /> August 12, 1996 <br /> 94-326 <br /> Ms Mary Meays <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> PO Box 388 <br /> Stockton, CA 95201-0388 <br /> Subject Groundwater Monitoring Report, April through June 1996, 26080 Thornton Road, <br /> Thornton, CA, Site Code 1864 <br /> Ms Meays <br /> This letter report summarizes field activities conducted by Smith Environmental Technologies <br /> 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 <br /> by Western Meter Service of Stockton, California Soil samples were collected beneath each tank <br /> and the associated piping Soil samples collected from beneath two of the tanks contained <br /> moderate to high levels of ethylbenzene and xylenes (1 2 to 70 parts per million [ppm]) as well as <br /> total petroleum hydrocarbons as gasoline (TPHg), at 470-830 ppm <br /> Due to the presence of elevated concentrations of petroleum hydrocarbons in the tank pit soil <br /> samples, further investigation was required by San Joaquin County Public Health Services, <br /> Environmental Health Division (PHS/EHD) <br /> In a two-phased approach beginning on November 1, 1990, RESNA personnel advanced six soil <br /> borings (MW1-MW6) to depths ranging from 27 to 30 feet below grade at the project site to <br /> accomplish the following 1) define the lateral and vertical extent of hydrocarbon impacted soils, <br /> 2) determine soil stratigraphy, and 3) install groundwater monitoring wells within the uppermost <br /> aquifer in order to assess groundwater quality The boring/well locations are plotted on Figure 2 <br /> Field methodology and analytical results are discussed in detail in RESNA's Interim Problem <br /> Assessment Report, dated January 13, 1992 <br /> The site's station building and garage were demolished in December 1994 to facilitate corrective <br /> action activities including the removal of hydrocarbon contaminated soil which was present <br /> W 1943261QUARTLYI2QR-1996 DOC 1 <br /> 1260 Graphics Drive Modesto, CA 95351-1502 - (209)579-2221 Fax(209)579-2225 <br /> Engineering Consulting - Remediation - Construction <br />