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1.0 INTRODUCTION This report is being submitted on behalf of Laidlaw Corporation to summarize the results of the subsurface investigation requested by the San Joaquin County Public Health Services, Environmental Health Division (SJCEHD), for possible soil and/or groundwater contamination at 1.444 Tillie Lewis Drive, Stockton, California (Figure On June 29, 1990, one underground xyle�}e-storage 5emco Cork was Of removed at the project site {Figure 2 by p• Modesto, CA. Soil Samples were Collected beneath the tank and an for benzene, toluene, ethylbenzene, xylenes y en e),(T XBC and total petroleum hydrocarbons as gasoline ate SPA and DHS Laboratories, Inc. , utilizing appropriate methodologies. The analytical results are summarized in Table 1. Laboratory data sheets are included in Appendix I. The presence of olavated concentrations of hydrocarbons in the tank pit soil samples indicated further investigation was vertic and/or to groundwater contaminationmine the latnthe project al extent of soil and/or g A preliminary report/workplan for the additional investigation was submitted to the SJCEHD and copied to the Central Valley Regional Water Quality Control Board (RWQCB) on December 10, 1990. The workplan was approved with no modifications and the project was placed into the Local UST Oversight Program by the SJCEHD on March 11, 1991- 2.0 BACKGROUND TECHNICAL DATA r 2.1 Name and address of contact person: Contact Person: Mr. Rod Nelson Laidlaw Corporation 1444 Tillie Lewis Drive Stockton, CA 95206 2.2 Estimates of liquid quantity and composition leaked: No estimate of the quantity of liquid contaminant leakage can be determined from existing information. Based on analytical results, the soil contamination appears to be derived from xylene solvents. The xylene tank was believed to have been emptied at the time it's use was discontinued. 1 LCR0510-WP