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r C C 'J r. r C i 7 J J n Mr. Michael Walton October 16, 2003 Walton Engineering, Inc. approximately 1 to 2 feet of soil from the surface of the stockpile to expose a fresh surface prior to driving the core sampler into the soil stockpile. A total of ten soil samples and one soil sample composite were listed on a chain of custody record and were transported directly to the environmental laboratory for chemical testing (Appendix A). Grayland returned to the site on September 16, 2003, to collected soil sample composites SP2a-d and SP2e-h from two soil stockpiles generated during the fuel system renovation work (Figure 2). These sample composites were collected in the same manner as described above. The two soil sample composites were listed on a chain of custody record and were transported directly to the environmental laboratory for chemical testing (Appendix A). LABORATORY ANALYSES AND RESULTS The soil samples collected from beneath the former underground waste oil storage tank, fuel dispensers, underground product lines and from the soil stockpiles at the site were analyzed by Kiif£ Analytical, LLC, of Davis, California, for total petroleum hydrocarbons in the range of gasoline (TPHg), the associated volatile organic compounds benzene, toluene, ethylbenzene and total xylene isomers (BTEX) and for the volatile fuel oxygenates methyl t butyl ether (MtBE), di -isopropyl ether (dIPE), ethyl t -butyl ether (ELBE), t -amyl methyl ether (tAME) and t -butanol (tBA) using Environmental Protection Agency (EPA) method 8260B with purge and trap EPA method 5030. Note: Kiff Analytical also analyzed the soil sample collected from beneath the former underground waste oil storage tank (S -7 -TI) and the soil sample composite collected from the soil stockpile generated during the tank removal work (SP 1 a -d) for the full scan of volatile organic compounds (VOCs) using the same aforementioned EPA methods and for total petroleum hydrocarbons in the range of diesel fuel (TPHd) and as motor oil (TPHmo) using EPA method 8015 modified. Kiff Analytical has been accredited by the State of California to perform these laboratory methods. Additionally, soil sample S -7 -Tl and soil sample composite SPla-d were analyzed by Cal Science Environmental of Garden Grove, California, for polychlorinated biphenyls (PCBs) using EPA method 8082 with EPA method 3545 and for the five California Assessment Metals (CAM5) cadmium, chromium, lead, nickel and zinc using EPA method 6010B with EPA method 3050B. Note: Chromium III and chromium VI were quantified using EPA method 7199 with EPA method 3060A. All of the aforementioned laboratory analytical methods were approved by the California State Department of Health Services. Cal Science Environmental has been accredited by the State of California to perform these laboratory methods. The laboratory results of the soil sample analyses indicated that only slightly elevated concentrations of TPHd, TPHmo, the fuel oxygenates MtBE and tBA and the assessment metals chromium, nickel, lead and zinc were present in the soil sample collected from beneath the former underground storage tank (Table 1). Low concentrations of these same hazardous compounds (excluding the fuel oxygenates) were detected in the soil sample composite collected from the associated stockpiles (Table 1). According to these laboratory data, significant soil contamination had not occurred beneath the former underground storage tank. The laboratory report for these soil sample analyses is presented in Appendix A of this report. GRA YLAND ENVIRONMENTAL Grand 022-370.fdr 3