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l <br /> f <br /> NAAS <br /> Working To Restore Nature <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Phone (209) 838-3507 <br /> FAX (209) 838-3509 <br /> January 5, 1994 <br /> Ms Linda Turkatte <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 2009 <br /> Stockton, CA 95201 <br /> Subject Quarterly Monitoring Report, October through December 1993 <br /> Laidlaw Corporation, 1444 Tillie Lewis Drive, <br /> Stockton, California, Site Code 2454 <br /> Dear Ms Turkatte <br /> This letter is being submitted by RESNA Industries Inc (RESNA) on behalf of Laidlaw <br /> Corporation to present the results of 1993 fourth quarter groundwater monitoring and sampling <br /> activities at the above referenced site (Figure 1) <br /> BACKGROUND <br /> On June 29, 1990, one 4,000-gallon underground xylene storage tank was removed at the protect <br /> site by SEMCO Corp of Modesto, California Laboratory analyses of soil samples collected <br /> from beneath the tank detected the presence of elevated concentrations of volatile organic <br /> constituents Further investigation was necessary to determine the lateral and vertical extent of <br /> soil and/or groundwater contamination at the project site <br /> To prevent the hydrocarbon impacted material from presenting a threat to groundwater, <br /> approximately 750 cubic yards of contaminated soil was excavated from the project site on <br /> March 19 and 20, 1991 Subsequent to the collection of verification soil samples, the open tank <br /> pit was backfilled with clean pea gravel to five feet below grade The pea gravel was overlaid <br /> by a fabric liner to prevent infiltration, and the pit was backfilled to grade with clean soil <br /> In subsequent investigations, RESNA personnel advanced six soil borings (MW 1-MW6) in the <br /> vicinity of the former underground storage tank and converted them to groundwater monitoring <br /> wells at depths of approximately 30 feet below grade The purpose of these borings was to <br /> investigate and define the extent of hydrocarbon impaction in soil and groundwater The <br /> boring/well locations are plotted on Figure 2 <br /> 15000214QR-1993 FNL C <br />