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PH, chloride iron concentration, sulfide ion concentration, and conductivity. <br /> The aeration of the sail. was qualitatively assessed by type and tire. <br /> All test procedures are deg=bed in Appendix A, with the fbaJd data, site <br /> information and laboratory bag in Appendix B. <br /> 3.0 DATA ANALYSIS <br /> The data collected at each of the locations was evaluated by a computer <br /> model to establish the mean time to corrosion failure (MTCF). Other <br /> significant information, including the concentration of hydrocarbons in the <br /> borings, the age of the tanks, the area classification, and the indication of <br /> internal corrosion, assist in development of a tank integrity assurance <br /> program. <br /> 3.1 Under� Tank Sterns <br /> The chister of ten underground tanks evaluated during this study were <br /> Located at 38 West Sonora Street in Stockton, California. All tanks are <br /> 8,000 gallon capacity itty instaled in 1983. The data tables (Appendix B) <br /> indicate the following contents: <br /> Tank No. Contents <br /> 1 Empty (was Xylene) <br /> 2 Unleaded Gasoline <br /> 3 Toluene <br /> 4 Methyl Ethyl Ketone <br /> 5 Empty (was Gasoline) <br /> 6 P M Acetate <br /> 7 Acetone <br /> 8 Xylene <br /> 9 Lacquer Thinner <br /> 10 Lacquer Thinner <br />