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, •-•i `-t t f.. - ����� <br /> } L-r `. i# SIERVI'GE Working To Restore Nature <br /> 1710 Main Street <br /> S4 DEC --9 PH 2: 36 <br /> Escalon, CA 95320 <br /> Phone (209) 838-3507 <br /> FAX (209) 838-3509 <br /> December 8, 1994 <br /> 150081 01 <br /> Ms Mary Meays <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 2009 <br /> Stockton, CA 95201 <br /> Subject Groundwater Monitoring Report, July through September 1994 <br /> 26056 Thornton, Road, Thornton, CA, Site Code 1864 <br /> Ms Meays <br />• This letter report summarizes groundwater monitoring activities conducted by RESNA Industries <br /> Inc (RESNA) 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 moderate <br /> to high levels of ethylbenzene and xylenes (1 2 to 70 parts per million [ppm]) as well as total <br /> 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 /> 6Sq <br />