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Mr. Thomas Bauhs - 3 - <br /> • 11 July 2005 <br /> Ms. Kitty Walker <br /> source material is left in the subsurface the higher the potential for additional migration,which <br /> will result in added cost and time necessary for cleanup.• <br /> 8. The 13 June Review Letter states, "cleanup goals for the site are required for responsible decision <br /> making....Establishing cleanup goals and a comprehensive cleanup plan for the L&M OU will <br /> enable efficient remediation of the Unocal and Morton-Alco OUs. The L&M OU cleanup plan <br /> will then be used to "dove-tail' cleanup plans for the Unocal and Morton-Alco OUs. The RDA <br /> will not approval (sic) excavation of soil at the Unocal OU until the L&M OU cleanup plan is <br /> prepared and approved." Interim remedial measures are routinely employed to remove source <br /> material in order to prevent further pollution and a larger problem. With source material still <br /> present the pollutant groundwater plume is unstable: Soil source and separate phase <br /> hydrocarbons any where within Area 2A must have priority for their removal. Preventing the <br /> continued leaching of pollution into groundwater is a responsible strategy. Although a final <br /> cleanup plan has not been approved L&M OU is not without guidance with regard to cleanup <br /> goals. Using the most stringent water quality criteria and environmental screening levels <br /> contained in Screening for Environmental Concerns at Sites with Contaminated Soil and <br /> Groundwater, prepared by the San Francisco Regional Water Quality Control Board will provide <br /> a reliable foundation for planning interim remedial measures. <br /> By 8 August 2005,please provide a comprehensive schedule for site activities, including sampling, <br /> approved remedies and planned submittals. If you have any questions regarding this letter or need <br /> additional information, you may contact me at(916)464-4682 or by email at <br /> mserr a(a�waterboards.ca.Qov. <br /> MARY ERRA <br /> Private Sites Cleanup Unit <br /> cc: Mr. Steven Becker& Jerry Lile,Department of Toxic Substances Control, Sacramento <br /> Mr. Jeffrey Wong, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Tracy Sizemore, ConocoPhillips, Tempe, AZ <br /> Mr. Robert Goodman, Law Office of Robert C. Goodman, San Francisco <br /> Mr. Sean Sherlock, Snell &Wilmer,Irvine <br /> Mr. Derrick Vallance, ConocoPhillips, Houston, TX <br /> Mr. William Brown, Esq., Daley&Heft, Solana Beach <br /> Ms. Audrey Winters, Attorney at Law, Gold River <br /> Ms. Barbara J. Anderson, City of Stockton, Stockton <br /> Ms. Gretchen Louden, Cesar Chavez Central Library, Stockton <br /> Mr. E.J. Williams,E.J. Williams Property Management, Stockton <br /> Mr. Rusty Benkosky and Clint Harms, SECOR International Incorporated, Sacramento <br /> Ms.Margaret Dahlen, Earth Tech, Sacramento <br /> Mr. Robert Traylor, Golden State Environmental, San Diego <br /> Ms. Susan Mearns, Santa Monica <br />