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t r- Aram +i�� j ,ai-AI-;II <br /> SWFN <br /> ENV3RONMENTALTECHNOLOGIESCORPORATION C -'� R <br /> ` n <br /> September 28, 1995 <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 /> Subject Groundwater Monitoring Report, April through June 1995, 26080 Thornton <br /> Road, Thornton, CA, Site Code 1864 <br /> Ms Meays <br /> This letter report summarizes groundwater monitoring activities conducted by Smith <br /> • Environmental Technologies Corporation (Smith Environmental) at the subject site (Figure <br /> 1) <br /> BACKGROUND <br /> On September 6, 1989, three underground gasoline storage tanks were removed at the <br /> project site by Western Meter Service of Stockton, California Soil samples were collected <br /> beneath each tank and the associated piping Soil samples collected from beneath two of the <br /> tanks contained moderate to high levels of ethylbenzene and xylenes (1 2 to 70 parts per <br /> million [ppm]) as well as 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 <br /> soil borings (MWl-MW6) to depths ranging from 27 to 30 feet below grade at the project <br /> site to accomplish the following 1) define the lateral and vertical extent of hydrocarbon <br /> impacted soils, 2) determine soil stratigraphy, and 3) install groundwater monitoring wells <br /> within the uppermost aquifer in order to assess groundwater quality The boring/well <br /> locations are plotted on Figure 2 Field methodology and analytical results are discussed in <br /> detail in RESNA's Interim Problem Assessment Report, dated January 13, 1992 <br /> 1500811QUARTLYI2QR-1995 DOC <br /> 1710 Main Street • Escalon,CA 95320 (209)838-3507 • fax(209)838-3509 <br /> Engeneenng • Consulting Remediation • Construction <br />