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. 1.0 INTRODUCTION The Teresi Trucking Company trucking yard is located at 900-112 East Victor Road in Lodi, California (Figure 1) The company operates a fleet of flatbed trucks The property contains a large multi-bay truck servicing building with adjoining office, a large warehouse building, and over 2 acres of asphalt parking lot for truck storage To fuel the vehicles, the company operates a fueling station in the rear portion of the property The fuel was stored in three underground storage tanks until they were removed and replaced with above-ground tanks in late 1995 During the tank removal, petroleum-contaminated soil was encountered, and additional excavation was performed to remove the contaminated soil However, soil samples that were collected when excavation was completed indicated that residual contammatAon was still present, prompting the Environmental Health Division of San Joaquin County Public Health Services (PHS/EHD) to request an assessment of the extent of the contamination Upgradient Environmental Consultants was retained to perform the assessment and subsequent groundwater monitoring Mr Ron Rowe of PHS/EHD provided regulatory oversight dunng the initial phase of investigation, more recently, oversight has been provided by Ms Carol Oz of PHS/EHD Drilling was completed in early 1996, and groundwater monitoring continued through the end of 1996 Very low concentrations of diesel were occasionally detected in one or two wells in 1996, and Upgradient Environmental recommended in the Fourth Quarter 1996 Report that the site be closed with no further action PHS/EHD did not concur with this • recommendation, but no further monitoring or investigation was requested or performed until Ms Oz assumed oversight responsibility in early 1999 In April of 1999, PHS/EHD requested two consecutive quarters of groundwater monitoring and the completion of a Sensitive Receptor Survey Monitoring took place in June and August, and because diesel concentrations were exceedingly low, was repeated in December Based on the results, Upgradient recommended site closure with no further action In February 2000, PHS/EHD concurred that no further action was necessary and requested Teresa Trucking to prepare a Site Closure Report Tlus report has been prepared in accordance with Appendix B of the Tri-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites The first part of the report summarizes the history of the protect The bulk of the report deals with the site characterization Appendix A contains the Checklist of Required Data For No Further Action Requests at Underground Tank Sites 2.0 HISTORY OF SITE INVESTIGATION 2.1 Tank Removal Jim Thorpe Oil Company removed the underground tanks on December 1, 1995 According to Rich Thorpe, one 10,000-gallon and one 12,000-gallon diesel tank and one 5,000-gallon gasoline tank were removed Seven soil samples were collected from . beneath the tanks, and samples were also collected from the dispenser island, piping trench, and soil stockpiles (Figure 2) GcoAnalytical Laboratories analyzed the samples 1