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• i <br /> Mr. Maurice Benson - 2 - 21 January 2009 <br /> Defense Logistics Agency <br /> It will be necessary for DESJC to analyze groundwater samples for naphthalene and <br /> 2-methyl naphthalene and evaluate the potential that these compounds have migrated to <br /> indoor air within the building. One approach would be to determine concentrations using <br /> USEPA Methods 8310 or TO-17, and estimating risk using the Johnson and Ettinger model. <br /> Based on experience gained at other sites with LPH floating on the water table, Regional <br /> Water Board staff believes it unlikely that LPH has attenuated and therefore, wells continue <br /> to be necessary. A monitoring well installation event would be the most cost effective next <br /> step for assessment of UST Site 25. Due to the presence of elevated concentrations of <br /> petroleum related constituents, active remediation will likely be required. <br /> If you have any questions, please contact me at (916) 464-4675, or by email at <br /> jbrownell@waterboards.ca.gov. <br /> James R. Brownell, P.G. <br /> Associate Engineering Geologist <br /> cc: Mr. Michael Work, USEPA Region 9, San Francisco <br /> Mr. Peter MacNicholl, DTSC Region 1, Sacramento <br /> Mr. Harlin Knoll, San Joaquin County Health Department, Stockton <br /> Mr. Rich Howard, TechLaw, Inc., Sacramento <br /> Mr. Brian Renaghan, AFCEE, San Antonio, Texas <br /> Mr. Michael Thomas, URS, Sacramento <br /> Ms, Stacy Louie, URS, Sacramento <br /> Ms. Linda Bond, Noblis, Davis <br /> Mr. John Anthony, Noblis, Greenwood Village, Colorado <br />