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. 1710 Main StreetRECEIVED Working to Restore Nature Escalon, CA 95320 O C T 0 6 1692 Phone (209) 838-3507 ENVIRONMENTAL HEALTH FAX (209)838-3509 PERMIT/SERVICES October 05, 1992 Ms Linda Turkatte San Joaquin County Public Health Services Environmental Health Division P O Box 2009 Stockton, CA 95201 RE Quarterly Monitoring Report, July through September, 1992, Laidlaw Corporation, 1444 Tillie Lewis Drive, Stockton, California, Site Code 2454 Dear Ms Turkatte This letter is being submitted by RESNA Industries Inc (RESNA) on behalf of Laidlaw Corporation to present the 1992 third quarter groundwater monitoring and sampling activities for the above referenced site (Figure 1) BACKGROUND On June 29, 1990, one 4,000-gallon underground xylene storage tank was removed at the project site (Figure 1) by SEMCO Corp of Modesto, California Laboratory analysis of soil samples collected from beneath the tank detected the presence of elevated concentrations of volatile organic constituents Further investigation was necessary to determine the lateral and vertical extent of soil and/or groundwater contamination at the project site To prevent the hydrocarbon impacted material from presenting a threat to groundwater, approximately 750 cubic yards of contaminated soils were excavated from the project site on March 19 and 20, 1991 Subsequent to the collection of verification soil samples, the open tank pit was backfilled with clean pea gravel to five feet below grade The pea gravel was overlaid by a fabric liner to prevent infiltration, and the pit was backfilled to grade with clean soil Excavated soils were stockpiled on site Field activities performed at the subject site during the excavation, including laboratory results from collected soil samples, are discussed in detail in RESNA's "Problem Assessment Report" dated May 30, 1991 QLFARTLYIQR090992 DRF