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t Jeffrey Baker Tesoro Petroleum Site No. 67078 April 23, 2004 Page 2 of 3 Two soil samples from each boring were submitted to Kiff Analytical LLC (Kiff Analytical) of Davis, California, for analysis of benzene, toluene, ethylbenzene, and total xylenes (BTEX), methyl tertiary butyl ether, tertiary butyl alcohol, tertiary amyl methyl ether, di-isopropyl ether, and ethyl tertiary butyl ether (oxygenates), 1,2-dichloroethane and 1,2-dibromoethane (lead scavengers), and total petroleum hydrocarbons in the gasoline range (TPHg) using EPA Method 8260B. The Kiff laboratory report is presented in Enclosure C. Results Soil borings were advanced near the fuel tanks and dispenser islands at the locations shown on Figure 2. Screening of soil samples with a PID did not detect the presence of volatile organic compounds. The PID results are presented on the soil boring logs included in Enclosure B. All but one of the PID results were zero. The one sample measured 4 part per million volume(ppmv). This readings is considered background. No odor or petroleum staining was observed in soil samples. The soil borings were not advanced to groundwater because field screening of soil samples did not detect petroleum hydrocarbon contamination. One soil sample collected at 5, 10, or 15 feet from each boring was submitted to Kiff Analytical for chemical analyses. Also, the bottom sample from each boring collected at 30 feet was submitted to Kiff Analytical for chemical analyses. With the exception of one analysis,Kiff Analytical did not detect BTEX, oxygenates, lead scavengers, or TPHg at or above the reporting limits. The laboratory analysis of the soil sample from boring B-4,collected at 30 feet bsg identified TPHg at 2.3 milligrams per kilogram. This is not considered to be a significant concentration. Furthermore, Kiff Analytical reported that the concentration was not typical of gasoline based on the observed chromatographic pattern. The laboratory chemical analyses results are summarized in Table 1 and the laboratory report presented in Enclosure C. Disposal of Drill Cuttings Two drums of soil cuttings generated during drilling activities were placed onsite. On April 9, 2004, Integrated Waste Management Inc.,of Milpitas,California removed the drummed soil from the site. Recommendations Delta did not encounter evidence of a fuel leak during the baseline assessment work performed at the site. Delta concludes that no further actions are needed at this site. Remarks/Signatures The recommendations contained in this report represent Delta's professional opinions based upon the currently available information and are arrived at in accordance with currently acceptable professional standards. This report is based upon a specific scope of work requested by the client. The Contract between Delta and its client outlines the scope of work,and only those tasks specifically authorized by the contract or outlined in this report were performed. This report is intended only for the use of Delta's Client and anyone else specifically listed on this report. Delta will not and cannot be liable for unauthorized reliance by any third party. Other than as contained in this paragraph,Delta makes no express or implies warranty as to the contents of this report.