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Tri Regional Recommendation Page 18 of 24 Appendix A able, cost-effective technology has been A NFAR letter indicates that the discharger is no implemented and chemical concentrations longer required to conduct active remediation, in groundwater are projected to meet water monitoring, or reporting work at the site unless quality objectives through natural processes new information indicates the presence of within a reasonable period of time, i e , previously unknown water quality impacts or prior to any potential future beneficial use threats to health, safety or sensitive ecological of groundwater Patterns of existing and receptors or that prior site characterization is projected future demands for usable water shown to have been misrepresented resources in the area must be considered in determining what period of time is reason- 6 2 Case Evaluation able The following recommendations to sections 6 3, Regional Board staff recognize that the total 6 4 and 6 5 below apply only to sites cleanup of a site,although possible, is not always contaminated with petroleum hydrocarbon fuels, technically or economically feasible Therefore, a (i e , gasoline,diesel,kerosene, stoddard solvent, NFAR designation for a UST site may be mineral spirits, fuel oil, aviation fuel mixtures and considered if the source has been removed and their additives), and should not be used for release analysis of the groundwater concentration trends cases involving chlorinated solvents,metals or indicates the chemical plume is reducing in size, other types of contaminants such that compliance with water quality Each site ;s evaluated on a case-by-case basis to objectives will be achieved within a reasonable determine if it is a"low risk" site (A site may be period considered a low risk site by definition,or achieve a low risk status by site remediation) For each 6 1 NFAR Process site, complete characterization is required to determine the lateral and vertical extent of When Regional Board or LIA staff concur that the contamination,the risk to human health and safety petroleum source is removed or remediated, risks and the environment(including the unsaturated to public health and safety and ecological zone, groundwater, and surface water),and the receptors are reduced to insignificant levels, and impacts on or threats to existing and potential groundwater has been cleaned up to levels future beneficial uses of water resources The protective of existing and future beneficial uses, discharger must demonstrate that the selected no further action is appropriate for a site remedial measure(s) are effective, and site monitoring must show that the remedial measure(s) At this point,the discharger will be requested to applied by the discharger has a high probability to submit a closure report to the lead agency and the reduce or remove the petroleum hydrocarbons to Regional Board with a formal request for no acceptable levels within a reasonable period further action at the subject site The discharger must also certify in writing a complete list of all record fee title owners to the Regional or LIA Once the lead agency has reviewed the closure report and the NFAR request,and determines that the NFAR report substantiates the request for closure, Regional Board or LIA staff will notify all current record owners of fee title to the site of the determination that no further corrective action is required The lead agency will request monitoring wells and remedial systems are properly destroyed, transferred or maintained under City/County approved permit A NFAR letter will be issued once verification of proper well destruction equipment removal is received