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Mr.M. Scott Mansholt—CEMC <br /> Presentation of Additional Metals Evaluation May 25,2007 <br /> Historic Pipeline Portfolio Page 4 of 5 <br /> SSLs(but not background)—are 0.09 and 0.35,which further demonstrates there is no association <br /> between these metals and TPHc. <br /> SUMMARY <br /> Based on the findings of this evaluation, SAIC concludes the following: <br /> • The average metals concentrations in the oil samples are lower than background. Further,the <br /> average metals concentrations in the oil samples are lower than the SSLs with the exception of <br /> arsenic,which is present at concentrations consistent with or lower than background <br /> concentrations. <br /> • Although some maximum metals concentrations (arsenic, cobalt, copper, lead,nickel,thallium, <br /> vanadium, and zinc)in soil exceed the lowest SSLs,the concentrations of those metals in oil <br /> samples are all lower than or within background ranges,indicating that TPHc in soil is not the <br /> cause of the SSL exceedances. <br /> • The average concentrations of metals in soil are all below the lowest SSL with the exception of <br /> arsenic and cobalt. The average arsenic and cobalt concentrations are within typical background <br /> concentrations, and the concentrations of these metals in the oil samples are below the <br /> background concentrations, indicating that the metals are not present as a result of the presence of <br /> TPHc. <br /> • Metals concentrations in soil do not show a correlation with TPHc concentrations based on the <br /> correlation analysis, further indicating that metals in soil are not associated with oil. <br /> The additional metals and oil data considered in this evaluation support CEMC's position that the crude <br /> oil carried in the OVP and the TAOC pipelines is not contributing metals in excess of background <br /> concentrations at HPP sites. <br /> Should you have any questions or comments regarding the contents of this report,please call me at(5 10) <br /> 433-0835. <br /> Sincerely, <br /> SCIENCE APPLICATIONS INTERNATIONAL CORPORATION <br /> �"O Jar <br /> WHili IJUf,J <br /> r��. cces <br /> Michael Hurd, CHG G r ,` r <br /> Senior Project Manager HYD' 1.0GIIT <br /> J> / <br /> Enclosures: TE OF C <br /> Figure 1 Metals Concentrations vs. SSLs and Low Background <br /> Figure 2 Concentrations vs. SSLs and High Background <br /> Figure 3 Average Metals Concentrations in Soil and Oil <br /> Figure 4 Average Metals Concentrations in Soil and Oil <br /> Table 1 Analytical Results for Metals, Soil and Oil Samples <br /> Attachment A TPHc Metals Correlation Plots <br />