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❑ Chemical Constituents— ❑ Radioactivity <br /> "Ground waters shall not contain chemical con- ❑ Salinity <br /> stituents in concentrations that adversely affect ❑ Sediment <br /> beneficial uses. <br /> ❑ Settleable Material <br /> "Ground waters designated for use as domestic or ❑ Suspended Material <br /> municipal supply(MUN) shall not contain concen- <br /> trations of chemical constituents in excess of the '❑ Temperature <br /> maximum contaminant levels specified in Califor- ❑ Turbidity <br /> nia Code of Regulations, Title 22, Division 4, <br /> Chapter 15. [California's drinking water stan- Some are expressed as numerical objectives,while <br /> dards.] others are in narrative form. <br /> "Ground waters designated for use as agricultural Types of Numerical Water Quality Goals <br /> supply(AGR)shall not contain concentrations of <br /> chemical constituents in amounts that adversely Where numerical water quality objectives for a pollut- <br /> affect such beneficial use." ant of interest do not exist in the applicable Water <br /> Quality Control Plan(s)and objectives are stated in <br /> i Tastes and Odors— narrative form,numerical water quality goals from <br /> other sources are used to implement the narrative <br /> "Ground waters shall not contain taste-or odor- objectives. The literature contains many useful water <br /> producing substances in concentrations that cause quality values designed to protect specific beneficial <br /> nuisance or adversely affect beneficial uses." uses of water,which can be used as water quality <br /> goals. The following is a summary of the available <br /> Toxicity— types of water quality goals. <br /> "All [inland surface] waters shall be maintained ❑ Maximum Contaminant Levels(MCLS)— <br /> free of toxic substances in concentrations that <br /> produce detriinmtal physiological responses in MCLS are part of the dtinldng water standards <br /> human,plant,animal,or aquatic life." adopted both by the California Department of <br /> Health Services(DHS),Office of Drinking Water in <br /> The Central Valley Regional Water Quality Control Title 22 of the California Code of Regulations <br /> Board's Basin Plans also contain water quality objec- (CCR),Division 4,Chapter 15, "Domestic Water <br /> tives for the following constituents and parameters: Quality and Monitoring"and by the U.S.Environ- <br /> ❑ Bacteria mental Protection Agency(U. S. EPA) under the <br /> Safe Drinking Water Act. DHS's drinking water <br /> ❑ Biostimulatory Substances standards are required to be at least as stringent as <br /> ❑ Color those adopted by the U.S.EPA. Some are more <br /> stringent. <br /> ❑ Dissolved Oxygen <br /> ❑ Floating Material Primary MCLS are derived from health based <br /> criteria(by U. S. EPA from MCL Goals;by DHS <br /> 7 Metals from one-in-a-million (101) incremental cancer risk <br /> ❑ Oil and Grease estimates for carcinogens and from threshold <br /> J Pesticides <br /> toxicity levels for non-carcinogens)in conjunction <br /> with technologic and economic factors relating to <br /> J pH the feasibility of achieving and monitoring for <br /> Jon B.Marshack,D.Env. Page 5 <br />