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09/22/2000 10:26 209-579-2-5 MODESTO ATC PAGE 02 <br /> r <br /> 1= 1LE <br /> EttYIRONMEttr,LL�tNOLOG P i10N <br /> iJ OCT 2 y/tI <br /> October 24, 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: Soil Excavation Report <br /> Gardner Property <br /> 26080 Thornton Road, Thornton, California <br /> Site Code 1864 <br /> Dear Ms. Meays: <br /> This letter report is submitted by Smith Environmental Technologies Corporation on behalf of <br /> Ms. Donna Gardner, to summarize excavation activities conducted at the above referenced site <br /> (Figure 1). The excavation was performed to remove hydrocarbon impacted soil associated with <br /> underground fuel storage tanks formerly located on the subject site. <br /> SITE 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 ethyl benzene 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 Industries, Inc. (RESNA) <br /> personnel advanced six soil borings (MWI-NfW6) to depths ranging from 27 to 30 feet below <br /> grade at the project site to accomplish the following; 1) define the lateral and vertical extent of <br /> hydrocarbon impacted soils, 2) detertrline soil stratigraphy; and 3) install groundwater monitoring <br /> 150081\SXR-0995.D0C <br /> 1710 Main Street - Escalon.CA 95320 .(209)838-3507 • fax(209)838-3509 <br /> Engrneer-g • Consulting Remediation • Construction <br />