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SOIL ASSESSMENT RELATED TO <br /> REMOVAL OF UNDERGROUND TANKS <br /> 620 West Charter Way,Stockton, California <br /> 1 Delta Project No 40-88-586 <br /> Page 6 <br /> A single soil sample taken from beneath the steel waste oil tank when it was removed in June of 1487 <br />' was analyzed for TPH, BTEX, and polychlorinated biphenyl (PCB) by EPA Method 8080, and <br /> halogenated volatile organics by EPA Method 8010 All of the test results were negative Copies of <br />' certified laboratory results are contained in Appendix A <br /> 2.3 Spill ILeak History <br />' No spills or leaks have been reported at this site Precision tank tests have been performed regularly <br /> over the years and no leaks have been detected Copies of the latest results (from June 1988) are <br />' contained in Appendix B The latest precision tests continue to indicate that the tanks are tight <br /> 2,4. Well Inventory <br />' An inventory of existing water supply wells within a one-half mile radius of the site will be <br /> conducted if petroleum constituents are detected at higher than acceptable levels in soils underlying <br />' the site. <br /> 2.5 Under roup Utilities <br /> All underground utility locations will be verified with respective utility companies prior to drilling <br /> of soil borings at the site <br /> 3.0 PROPOSED SOIL BORINGS <br /> This section describes the proposed assessment, including the depth and distribution of exploratory <br /> soil borings The methods used to drill and sample the borings, the analytical procedures, the quality <br /> assurance plan, and the site safety plan are contained in Appendix C <br /> I3 1 ExJiloratory Soil Borings <br /> I Four soil borings will be advanced adjacent to the existing tank location (Figure 3) One soil boring <br /> will be advanced adjacent to product-distribution lines The other two borings are located within <br /> the area to be excavated to install new underground storage tanks <br /> Borings will be advanced using a 7 5-- to 8-inch diameter hollow-stem auger Samples will be <br /> collected in a California-modified split-barrel sampler Appendix C, Section I 1 describes the <br /> drilling and sampling techniques to be used <br />