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Mr. Maurice Benson - 3 - 21 January 2011 <br /> Defense Logistics Agency <br /> DLA proposes to incorporate SVE Termination and Optimization Protocol (STOP) into the <br /> Comprehensive ROD as the process and criteria necessary to evaluate when SVE has <br /> reached the appropriate stage to discontinue operations and proceed to site closure. <br /> However, STOP presented in the ESD only evaluates the potential for residual contaminants <br /> in soil vapor to migrate to groundwater; it does not evaluate potential contaminant migration <br /> to indoor air. <br /> Draft/Final ESD <br /> DLA has completed necessary feasibility studies to support the inclusion of SVE, enhanced <br /> with pneumatic fracturing, to the Comprehensive ROD remedy for soil cleanup beneath <br /> Warehouse 10 within SWMU 20. DLA has not completed necessary risk evaluations to <br /> support proposed changes to soil vapor cleanup standards in the Comprehensive ROD. DLA <br /> should delete the proposed cleanup standards sections of the Draft ESD, and only include <br /> the remedy change for Warehouse 10 in the Draft/Final ESD. DLA must show that proposed <br /> alternative cleanup standards are protective of human health and the environment before <br /> they can be added to the Comprehensive ROD. <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. Phillip Ramsey, USEPA Region 9, San Francisco <br /> Mr. Christopher Sherman, DTSC Region 1, Sacramento <br /> Mr. Harlin Knoll, San Joaquin County Health Department, Stockton _ <br /> Mr. Charles O'Neill, HDR, Folsom <br /> Mr. David Hofmann, Booz, Allen, Hamilton Inc., San Antonio, Texas <br /> California Environmental Protection Agency <br /> �Recycled Paper <br />