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UNDERGROUND STORAGE TANK REMOVAL REPORT 3624 S. Airport Way Stockton, California April 24, 2002 1.0 INTRODUCTION On April 9, 2002, Speelman Excavation (Speelman) excavated and removed one 550-gallon capacity underground storage tank (UST) located at 3624 S. Airport Way in Stockton, California (Figures I and 2, Appendix A). Condor Earth Technologies, Inc. (Condor) was retained by Industrial Developments International, Inc. 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. 2.0 UNDERGROUND STORAGE TANK REMOVAL .. On March 1, 2002, Condor personnel supervised a backhoe investigation of suspect areas of the site previously identified during a magnetometer survey. During the backhoe investigation, one UST was discovered in the southwest comer of the site in an area formerly associated with the structures of a ranch ` complex. The UST was partially excavated to ascertain the approximate size and volume of the tank, and to assess the potential for soil contamination resulting from release of product from the UST to the environment. The UST was calculated to be of approximately 550-gallon capacity. No observable indicators of soil contamination were noted. Three sod samples (3523C-TP1-7.5-8', 3523C-TP2-5.5-6', and 3523C-TP3-6.5-7') were collected from the tank pit and delivered to Argon Laboratories, Inc. of Ceres, California for analysis. The samples were analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-G) and benzene, toluene, ethylbenzene, and total xylenes (BT'EX)by EPA Method 8020, TPH quantified as diesel (TPH-D) by EPA ` Method 8015m and oxygenates including methyl-tertiary-butyl ether (MTBE)by EPA Method 8260. None of these constituents were detected at or above the laboratory reporting limits. On April 9, 2002, Speelman excavated and removed one UST from the site. The former location of the UST is shown in Figure 3,Appendix A. Condor representatives were on site to make field observations and collect soil samples following removal of the tank. Ms. Michelle Sterni-Le of the San Joaquin County Environmental Health Department (SJCEHD) was on site to observe the UST removal activities and to specify soil sampling locations and respective laboratory analyses. Ms. Steri-Le also acted on behalf of Inspector Kent Miller of the City of Stockton Fire Prevention Division, who was unavailable. At 8:00, approximately 15 pounds of dry ice were introduced into the UST to evacuate oxygen and potential residual explosive vapors. At 10:15, an oxygen and lower explosive limit (LEL) meter was used to determine the oxygen and volatile gas levels inside the UST. At this time, the LEL reading was 0% and the OZ reading was 7.6%. Ms. Stemi-Le indicated that Inspector Miller had instructed her to require the oxygen level be below 7% before removal. Approximately 50 more pounds of dry ice were added to accomplish this. Excavation operations commenced at 10 15 and were completed by 10:30, at which time an LEL reading of 0% and anO2 reading of 2.7% were recorded. Ms. Sterni-Le gave her approval for • CONDOR r