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0 <br />l <br />1 <br />0 <br />0 <br />hazardous waste (STLC and TTLC) and drinking water (Action Levels and Maximum <br />Contamination Levels). <br />STLCs and TTLCs are values established by the California Department of Health <br />Services (DHS) above which liquid and solid wastes are considered hazardous due to <br />the persistent and bioaccumulative nature of specific toxic substances. STLCs and <br />TTLCs are listed in Title 22, Section 66699 of the California Administrative Code <br />(CAC). <br />DHS Action Levels are health -based criteria set by the state to limit public exposure to <br />substances not yet regulated by formal standards. They are levels at which DHS <br />requires water purveyors to take corrective action to reduce the level of contamination in <br />the water they supply. The full parameter list is provided in the September 1986 DHS <br />document Drinking Water Action Levels Recommended by the Department of Health <br />Services. <br />Drinking water standards establish limits for substances that may affect public health or <br />the aesthetic qualities of water. There are two types of standards: primary standards and <br />secondary standards. Primary standards relate to the protection of public health. These <br />standards specify limits for substances in water that may be hannful if consumed in <br />excess for a long time. Secondary standards relate to the aesthetic qualities of water <br />such as taste, odor, or clarity. These standards specify limits for substances that may <br />influence consumer acceptance of the water. Drinking water standards, also known as <br />Maximum Contaminant Levels (MCLs), are listed in Title 22, Sections 64435 and <br />64473 of the CAC. <br />It should be noted that the shallow perched aquifer is not used as a drinking water <br />supply. As such, the comparison to the standards provides a general indication of water <br />quality, but exceeding the standards does not necessarily imply a significant or adverse <br />impact on the beneficial uses of the water resources. The deep regional aquifer is used <br />as a drinking water supply. <br />STL 9390314 26 BRye-Ino 806/N& <br />