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UNDERGROUND STORAGE TANK REMOVAL REPORT ` Former Stockton Metropolitan Transit District 730 E. Channel Street Stockton, California 1.0 INTRODUCTION On April 29, 2003, Oil Equipment Services (OES) removed one underground storage tank (UST) and piping located at 730 E. Channel Street in Stockton, California (site, Figures 1 and 2, Appendix A). Condor Earth Technologies, Inc. (Condor) was retained by Raymond Investment Corporation, property owner, to provide sampling and reporting services. This report includes a description of the fieldwork, discussion of the laboratory analyses, and conclusions and recommendations based on the laboratory analytical results of the soil samples. Pertinent figures are included in Appendix A, site photographs are ` included in Appendix B, and laboratory reporting sheets and chain-of-custody forms are included in Appendix C. 2.0 UNDERGROUND STORAGE TANK REMOVAL The UST at the site was discovered as part of a Phase 11 Environmental Site Assessment performed in May, June, and September 2002, and completed for the City of Stockton Department of Housing and Redevelopment. Removal of the UST was required by SJCEHD. OES acquired the necessary permits for the tank removal prior to any UST-related work at the site. On April 28, 2003, the UST was rinsed and steam cleaned. Approximately 650 gallons of product remained in the UST. The product and rinsate were removed by American Valley Waste Oil, Inc. under a Uniform Hazardous Waste Manifest to Industrial Service Oil Co.,Inc. of Los Angeles, California. On April 28, 2003, an OES representative was on site to perform preliminary procedures to inert the UST. Approximately 100 pounds of dry ice (solid carbon dioxide) were placed in the UST to evacuate ` any remaining explosive vapors. The UST and piping at the site were uncovered, and all of the piping was removed. Condor representatives were on site on April 29, 2003, to make field observations and collect soil ` samples following removal of the UST and the associated piping. Ms. Dina Abate of the San Joaquin County Environmental Health Department (SJCEHD) and a representative from the Stockton Fire Department were on site to observe the UST and piping removal activities and the collection of soil samples. An oxygen and LEL meter was not used to measure the amount of explosive vapors and oxygen gas present in the UST as there were holes in the UST preventing the positive displacement of ambient oxygen with carbon dioxide. OES excavated and removed one UST and approximately 85 feet of piping from the site. The former location of the UST and the piping are shown in Figure 2, Appendix A. The UST was identified as an approximately 1,000-gallon capacity single-wall steel tank 12 feet long and four feet in diameter. The excavation associated with the UST was approximately six feet by 15 feet by six feet deep. Photographs #1 through#3 show the removal of the UST. w �.� %tw- CONDOR r