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established "acceptable exposure levels " The ratio of the exposure levels to the acceptable <br /> levels is called the Hazard Index <br /> 1.2 The LUFT Evaluation <br /> The California State Department of Health Services (DHS) and the California Water <br /> Resources Control Board (CWRCB) developed the Leaking Underground Fuel Tank Field <br /> Manual in 1985 to provide consistent procedures for determining whether an underground <br /> storage tank site is "clean and safe", i.e., protects human health and the environment. These <br /> procedures provide a systematic means by which the following questions may be addressed <br /> • Whether an unauthorized release of a chemical has occurred <br /> • Whether soil has been impacted by the release of these <br /> products to an extent which would pose a threat to groundwater <br /> • Whether release of these products has directly affected ground <br /> water <br /> The practical and achievable goal of these guidelines is to clean up soil and groundwater <br /> to levels protective of public health and the environment, i e , groundwater The LUFT <br /> manual provides a three-tiered evaluation process which is used to set site-specific cleanup <br /> levels for soil which are protective of groundwater The methodology allows for minimal <br /> site-specific data to be used in a generic evaluation (General Risk Appraisal) up to <br /> substantial site-specific data to be used in a detailed evaluation(Alternative Risk Appraisal) <br /> In addition to requiring a different amount of site-specific data for input into an evaluation <br /> of differing complexity, the three tiers of the LUFT evaluation also represent varying levels <br /> of conservatism Tier 1, called No Evidence of Significant Soil Contamination of Any <br /> Groundwater Pollution, is the simplest method to set one overall site-specific cleanup level <br /> for soil which incorporates the greatest amount of conservatism and needs the least amount <br /> of site-specific data Tier 2, called Known Soil Contamination, requires more site-specific <br /> data than Tier 1 and uses a more detailed evaluation to set a cumulative total allowable <br /> concentration in the soil column which is protective of groundwater. Tier 2, through the use <br /> G XMW71MANTAFE FNL\IcnV 26 93 1-5 cbe"OP 1933 <br />