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1 <br />' 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 />' G If the contamination concentration of the de-watered 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 bean <br /> adequate and necessary element of the work plan <br />' DATED April 14, 2004 —BY <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 Life <br /> 1 <br /> 1 <br /> r <br />