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SKTH <br /> ENVIRONMENTAL TECHNOLOGIESGORPORATlON <br /> October 30, 1997 <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, July through September 1997, 26080 Thornton <br /> Road, Thornton, CA, Site Code 1864 <br /> Ms Meays <br /> This letter report summarizes field activities conducted during the Third Quarter 1997 by Smith <br /> Technology Corporation at the subject site (Figure 1) On August 20, 1997 ATC Associates, Inc <br /> (ATC Associates) purchased certain assets of Smith Technology <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 Sol] 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 to 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 Industries Inc personnel <br /> advanced six sot] borings(MW1 through MW6) to depths ranging from 27 to 30 feet below grade <br /> at the project site to accomplish the following 1) define the lateral and vertical extent of <br /> hydrocarbon impacted soils, 2) determine soil stratigraphy, and 3) install groundwater monitoring <br /> wells within the uppermost aquifer in order to assess groundwater quality The bonng/well <br /> locations are plotted on Figure 2 Field methodology and analytical results are discussed in detail <br /> In RESNA's Interim Problem Assessment Report, dated January 13, 1992 <br /> w 194326quart1y\3gr-1997 doc 1 <br /> 1260 Graphics Drive Modesto,CA 95351-1502 (209)579-2221 Fax(209)579-2225 <br /> Engineering Consulting - Remeduttion - Construction <br />