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rf � { i GROUND ZERO ANALYSIS, INC. } 3422 W Hammer Lane, Suite C-294 Stockton, California 95219 Telephone (209) 952-3481 Facsimile (209) 952-9891 January 4, 1996 Ms Linda Turkatte San Joaquin County Public Health Services Environmental Health Division P O Box 388 Stockton, CA 95201-0388 Subject Site Status Report, Period Ending December 31, 1995 Former Laidlaw Corporation Facility 1444 Tillie Lewis Drive, Stockton, California Dear Ms Turkatte At the request of Laidlaw Corporation, this letter report is submitted by Ground Zero Analysis, Inc (Ground Zero) to summarize activities at the above referenced site (Figure 1) during the period ending December 31, 1995 Activities included monitoring depth to water in site monitoring wells, purging and sampling wells MW 1 through MW6, and analyzing samples for benzene, toluene, ethylbenzene, xylenes (BTEX), and total petroleum hydrocarbons as gasoline (TPHG) BACKGROUND On June 29, 1990 one 4,000-gallon underground xylene storage tank was removed at the project site by SEMCO Corp of Modesto, California Laboratory analyses 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 groundwater contamination at the site To prevent the hydrocarbon impacted material from presenting a continued threat to groundwater, approximately 750 cubic yards of contaminated soil was 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 overlain by a fabric liner and the remaining portion of the pit was backfilled to grade with clean