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Page 14 Excerpts on Ground Waters and �Cleanup from the Water Quality Control Plan iii. feasibility study of cleanup alternatives which compare effectiveness,cost, and time to achieve cleanup levels. Cleanup levels covered by this study shall include,at a minimum,background levels,levels which meet all applicable water quality objectives and which do not pose significant risks to health or the environment, and an alternate cleanup level which is above background aevl lss an which also meets the requirements as specified in paragraphs g. ( ) ( g. Ground Water Cleanup Levels Ground water cleanup levels shall be established based on: i. background concentrations of individual pollutants, ii, applicable water quality objectives to protect designated beneficial uses of the water body, as listed in Chapters II and III; iii. concentrations which do not pose a significant risk to human health or the environment,considering risks from toxic constituents to be additive across all media of exposure and,in the absence of scientifically valid data to the contrary, additive for all constituents having similar toxicologic effects or having carcinogenic effects; and iv. technologic and economic feasibility of attaining background concentrations and of attaining concentrations lower than defined by(it) and(iii)above. Factors in(1)through(iv) above are used to establish ground water cleanup levels according to the following principles: V. Pursuant to 23 CCR Section 2550.4,the Regional Water Board establishes cleanup levels that are protective of human health,the environment and beneficial uses of waters of the state, as measured by compliance with(if) and(iii)above, and are equal to background concentrations if background levels are technologically and economically feasible to achieve. If background levels are infeasible to achieve, cleanup levels are set between background concentrations and concentrations that meet all criteria in{ii) and(iii) above. Within this concentration range,cleanup levels must be set at the lowest concentrations that are technologically and economically achievable. In no case are cleanup levels established below natural background concentrations. vi. Technologic feasibility is determined by assessing the availability of technologies which have been shown to be effective in reducing the concentrations of the constituents of concern to the established cleanup levels.Bench-scale and/or pilot-scale studies may be necessary to make this feasibility assessment in the context of constituent,hydrogeologic, and other site-specific factors. Economic feasibility does not refer to the subjective measurement of the ability of the