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prevent toxicologic impacts on humans and other potential "biological receptors of <br /> concern" While sufficient to cover DHS's interests in site cleanups, this methodology is <br /> not designed to protect all present and probable future beneficial uses of waters that may <br /> We adversely impacted by the contanvnants. It can be shown that the threat posed to water <br /> ualitY by contaminated soils is closely related to that posed by wastes in an unlined <br /> landfill. As such, the Designated Level Methodology can be used to select cleanup levels <br /> which will protect the quality of nearby ground and surface waters. As always,the <br /> background concentrations of contaminants must be factored into the cleanup level setting <br /> process. <br /> When combined with the waste classification and cleanup level setting processes of DHS <br /> and the State Water Board's Subchapter 15 regulations, the Designated Level Methodology <br /> can provide a complimentary set of procedures to ensure the protection of both the public <br /> health and the quality of useable waters of California. <br /> r <br /> I <br /> L <br /> R� <br /> k[ <br /> S <br /> Page 4 Designated Level Methodology <br /> t <br />