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r =1T <br /> =7 <br /> Z�MA <br /> 4 ` Working To Restore Nature <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Phone (209) 838-3507 Z�� <br /> FAX (209) 838-3509 <br /> May 19, 1994 <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, January through March 1994 <br /> 26056 Thornton, Road, Thornton, CA, Site Code 1864 <br /> Ms Meays- <br /> This letter report summarizes groundwater monitoring activities conducted by RESNA Industnes <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 <br /> site by Western Meter Service of Stockton, California Soil samples were collected beneath each <br /> tank 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 <br /> 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 (PHSIEHD) <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 <br /> soils, 2) determine soil stratigraphy, and 3) install groundwater monitoring wells within the <br /> uppermost aquifer in order to assess groundwater quality The boring/well locations are plotted <br /> 150081/QUARTLY/IQR 1994 FNL <br />