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California RRional Water Quality Pontrol Board <br /> Central Valley Region <br /> Alan C.Lloyd,Ph.D. Robert Schneider,Chair Arnold <br /> Secretaryfor Sacramento Main Office Schwarzenegg <br /> Environmental 11020 Sun Center Drive#200,Rancho Cordova,California 956706114 Governor <br /> Protection Phone(916)464-3291www acerb •FAX(916)464464n n „� <br /> http:// ,waterboards.ca.gov/cenValvalle V <br /> FEB 2 7 2006 <br /> ENVIRONMENT HEALTH <br /> 22 February 2006 PERMIT/SERVICES <br /> Mr. Frank Barone <br /> Miller Springs Remediation Management, Inc. <br /> 2480 Fortune Dr., Suite 300 <br /> Lexington, KY 40509-4168 <br /> REVISED CONTINGENCY PLAN, OXYCHEMSTOCKTON, 1904 CHARTER WAY, <br /> SAN JOA QUIN COUNTY <br /> Occidental Chemical, J.R. Simplot Company, PureGro, and other companies operated a former <br /> agricultural chemical distribution facility at 1904 Charter Way in Stockton, referred to as <br /> OxyChem. Miller Springs Remediation Management, Inc. (MSRM) has taken the lead in <br /> remediating this site. In 2001, MSRM thermally treated about 2,900 tons of soil contaminated <br /> with pesticides and fumigants, and in 2002, planted about 1,500 eucalyptus trees to treat residual <br /> contaminants in soil, as proposed in its November 2001 Phytoremediation Work Plan and <br /> approved in Central Valley Regional Water Quality Control Board(Regional Water Board) <br /> staff's 12 July 2002 letter. MSRM submitted an October 2004 Groundwater Cleanup and <br /> Contingency Plan (2004 Cleanup Plan), prepared by its consultant, Geomatrix Consultants, that <br /> proposed that the existing phytoremediation plantation could provide groundwater remediation as <br /> well as soil remediation. The 2004 Cleanup Plan also proposed that since the 2001 soil <br /> remediation had removed the source area, monitored natural attenuation could be relied upon for <br /> downgradient remediation. Regional Water Board staff reviewed this document and in its <br /> 18 August 2005 letter, concurred with the phytoremediation operation and maintenance portion <br /> of the 2004 Cleanup Plan, provided that MSRM make some adjustments to the soil sampling <br /> analytical suites. However, Regional Water Board staff requested revisions to the Contingency <br /> Plan portion of the document. In response, MSRM provided the October 2005 Revised <br /> Groundwater Cleanup and Contingency Plan (Revised Contingency Plan) prepared by <br /> Geomatrix Consultants. In order to minimize confusion with multiple versions of the <br /> Groundwater Cleanup and Contingency Plan, in the Revised Contingency Plan, Geomatrix <br /> updated the Groundwater Cleanup portion of the document with adjustments to the soil sampling <br /> program as requested in our 18 August letter, and provided a revised copy of the Contingency <br /> Plan. Regional Water Board comments on the Contingency Plan portion of the Revised <br /> Groundwater Cleanup and Contingency Plan follow. <br /> California Environmental Protection Agency <br /> Cd Recycled Paper <br />