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Stantec <br /> Site History and Previous Investigations <br /> BP Stockton Terminal No. 40T <br /> June 17, 2009 <br /> above background level for the salts proposed for treatment. Due to potential problems <br /> associated with determining background level of nitrate, phosphate, and other salts being used <br /> as part of the proposed nitrate/sulfate treatment system. Stantec determined that the best <br /> approach would be to limit addition to calcium sulfate. Use of calcium sulfate reduced the <br /> potential that groundwater concentrations in down gradient point of contingency wells would <br /> exceed background levels and require some sort of mitigation. <br /> 0040T Site History and Previous Investigations.doc 4 <br />