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424 Van Buren <br /> Stockton, CA 95203 <br /> Workplan Approval,Page 2 <br /> 5. In a telephone conversation with Treadwell &Rollo on April 13, 2004, EHD agreed <br /> that the de-watered groundwater could be disposed into City of Stockton sanitary <br /> system if the contamination concentration does not exceed the acceptable levels of <br /> the city's sanitary system. Submit to EHD a copy of the permit for groundwater <br /> discharge from City of Stockton Department of Municipal Utilities before disposal <br /> of the de-watered groundwater. <br /> 6. If the contamination concentration of the de-wateted groundwater exceeds levels <br /> acceptable to City of Stockton sanitary system, contingency to reduce the <br /> contamination to levels acceptable for disposal using methods such as granulated <br /> active charcoal (GAC) should be provided. <br /> 7. Implement the proposed work within 45 days of this letter. <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN (H&S 25299.37, <br /> subd.(C)(3).): <br /> 1. The proposed placement of oxygen releasing compound (ORC) is not approved. <br /> The effectiveness of ORC as a remediation alternative for impacted soil and <br /> groundwater caused by underground storage tank release has not been demonstrated <br /> in the San Joaquin County. EHD does not consider the placement of ORC to be an <br /> adequate and necessary element of the work plan. <br /> DATED April 14, 2004 BY l� <br /> C: Treadwell&Rollo— David Dixon, RG <br /> C: RWQCB, Central Valley Region—James L. L. Barton, RG <br /> C: Department of Toxic Substance Control—Jerry Lile <br />