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A EVA <br /> • Working To Restore Nature <br /> 1710 Main Street <br /> Escafon, CA 95320 <br /> Phone (209) 838-3507 <br /> FAX (209) 838-3509 <br /> January 13, 1993 <br /> Ms Linda Turkatte <br /> San Joaquin County Public Health Services ' r' <br /> Environmental Health Division <br /> P O Box 2009 n �� �.� <br /> Stockton, CA 95201 <br /> ron <br /> €NVIRONM-r! 114- HEALTI-1 <br /> PERM IT/St'R DICES <br /> RE Quarterly Monitoring Report, October through December, 1992, Laidlaw <br /> Corporation, 1444 Tillie Lewis Drive, 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 1992 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 project <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 <br /> of 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 sods were 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 /> Excavated soils were stockpiled on site <br /> QUARTLYIQRf20992 FNL <br />