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Operable Unit 2 ARARs -2- 24 May 1993 <br /> DDRW, Sharpe <br /> State Board Resolution 92-49 establishes policies and procedures for the <br /> oversite of investigations and cleanup and abatement activities resulting from <br /> discharges which affect or threaten water quality. This resolution <br /> establishes the policies and procedures for implementing Section 13304 of the <br /> Water Code and requires compliance with Resolution No. 68-16 and Chapter 15 of <br /> the CCR. It is to be considered (TBC) for soil and groundwater cleanup <br /> activities. <br /> The following objectives need to be accomplished to comply with these above <br /> ARARs: <br /> a. Establish basewide background concentrations. Background soil and <br /> ground water concentrations must be established in a manner that <br /> satisfies Article 5 of Chapter 15, Title 23 of the CCR. Background <br /> concentrations for metals, general metals, general minerals and <br /> parameters must be established in soils, surface waters and ground <br /> water. For man-made volatile organic contaminants in soils and in <br /> ground water the background concentrations is considered non-detect. <br /> b. Determine all soil contaminants at each site that create impacts to <br /> ground water or surface waters. Health based risk assessment cleanup <br /> levels may not be sufficient for defining aquifer/soil cleanup levels <br /> for contaminants to protect water quality. All contaminants <br /> concentrations, not just contaminants of concern in ground water, above <br /> background values will have to be evaluated remediated or demonstrated <br /> as having no potential for impacting ground or surface waters. <br /> C. Develop and/or collect sufficient information to support a disposal <br /> alternative evaluation as part of the remedial action. This includes <br /> any constituents or contaminants that may be present in soils and ground <br /> water above background. Attached is a "Water Quality Site Assessment" <br /> document which describes the process to evaluate if remedial action is <br /> necessary to protect water quality. <br /> d. Follow "Tri-Regional Board Staff Recommendations for Preliminary <br /> Investigation and Evaluation of Underground Tank Sites" . <br /> In addition, the site closure requirements of Chapter 15, Title 23 may be <br /> applicable at any soils OU site that has contaminants at concentrations above <br /> basewide background concentrations and/or are not naturally occurring. If it <br /> can be demonstrated that the contaminants may impact groundwater if left in <br /> place, the site must satisfy these requirements. <br /> In considering remedial alternatives for soil and ground water cleanup the <br /> Feasibility Study (FS) must include a No Action Alternative. In order to meet <br /> the State ARARs, including Porter Cologne (Section 13304) and Chapter 15 <br /> requirements of a soil/ground water cleanup to background, a Background <br /> Alternative should also be included. Part of the evaluation of alternatives <br /> in the FS includes consideration of technical feasibility/implementability and <br /> cost, two out of the nine factors. The background alternative may after this <br /> evaluation, not be a technically or economically feasible alternative. <br /> Another alternative would be cleanup to protect beneficial uses, or one to <br />