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r <br /> The criteria and standards presented for comparison in Table II are, EPA <br /> drinking water standards, California drinking Water standards, and California <br /> Department of Health Services (CDHS) Action Levels (Ai,$). <br /> Drinking water standards establish limits for substances that may affect <br /> health or aesthetic qualities of water. There are two types of standards: <br /> primary standards, also known as Maximum Contaminant Levels (MCLs), and <br /> secondary standards. Primary standards relate to the protection of public <br /> health. These standards specify limits for substances in water that may be <br /> harmful if consumed in excess for long periods of time. The MCL standards <br /> purposely and significantly exaggerate the potential health risks. Secondary <br /> standards relate to aesthetic qualities of water, such as taste, odor, and <br /> clarity. These standards specify limits which may influence consumer acceptance <br /> of the water. Secondary standards have not been included in the tables because <br /> they are not pertinent. Drinking water standards are listed in Title 22, <br /> Sections 64444.5 and 64473 of the California Code of Regulations (OCRs). <br /> CDHS Action Levels are health-based criteria established by the State to <br /> limit public exposure to substances not yet regulated by formal standards. <br /> These are levels at which the CDHS requests water purveyors to take corrective <br /> action to reduce the level of contaminants in the water they supply to protect <br /> public health. The full list of parameters is provided in the CDHS document <br /> Drinking Water Action levels Recommended by the Department of Health Services <br /> Y�f <br /> (CDHS, September 1986). <br /> b14 <br /> Because the groundwater monitored at the site is not currently used as a <br /> T drinking water source, instances where these standards are exceeded do not <br /> necessarily signify the need for cleanup or the existence of a significant <br /> environmental threat; they are provided solely as benchmarks of water quality <br /> S <br /> for comparison purposes only. <br /> As illus -trated Ir- Table II, benzene, trichloroethylene, and <br /> tetrachloroethylene are the primary chemicals detected with levels above both <br /> State and EPA MCLS. The compound 1,1-dichloroethane is above the CDHS AL but <br /> F BIONTL.H2O 5 April, 1990 <br />