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characteristics in the main water mass unless The sixth point is that WQOs may be in numerical otherwise designated. They may not apply at or in or narrative form. The enumerated milligram-per- the immediate vicinity of effluent discharges, but at liter (mg/1) limit for copper is an example of a the edge of the mixing zone if areas of dilution or numerical objective; the objective for color is an criteria for diffusion or dispersion are defined in the example of a narrative form. waste discharge specifications. WATER QUALITY OBJECTIVES The third point is that achievement of the objectives FOR INLAND SURFACE WATERS depends on applying them to controllable water quality factors. Controllable water quality factors The objectives below are presented categories are those actions, conditions, or circumstances which, like the Beneficial Uses of Chapter er II, were standardized for uniformity among the Regional resulting from human activities that may influence Boards when basin planning was first underway. the quality of the waters of the State, that are subject to the authority of the State Board or the The , a apply to all surface waters is sub-basins 5B Regional Board, and that may be reasonably SA, SB, and SC including the Delta, or as noted. controlled. Controllable factors are not allowed to (The boundaries of the Delta are identified in cause further degradation of water quality in Figure 111-1.) The numbers in parentheses instances where other factors have already resulted following specific water bodies are keyed to Figure in exceedence of the WQOs. II-1. The fourth point is that in cases where WQOs are Bacteria formulated to preserve historic conditions, there may In waters designated for contact recreation be insufficient data to determine completely the (REC-1), the fecal coliform concentration based on temporal and hydrologic variability representative of a minimum of not less than five samples for any historic water quality. When violations of such 30-day period shall not exceed a geometric mean of objectives occur, the Regional Board judges the 200/100 ml, nor shall more than ten percent of the reasonableness of achieving those objectives through total number of samples taken during any 30-day , regulation of the controllable factors in the areas of period exceed 400/100 ml. concern. For Folsom Lake (50), the fecal coliform The fifth point is that the State Board adopts policies concentration based on a minimum of not less than and plans for water quality control which can five samples for any 30-day period, shall not specify WQOs or affect their implementation. Chief exceed a geometric mean of 100/100 ml, nor shall among the State Board's policies for water quality more than ten percent of the total number of control is State Board Resolution No. 68-16 samples taken during any 30-day period exceed (Statement of Policy with Respect to Maintaining 200/100 ml. i High Quality of Waters in California). It requires that wherever the existing quality of surface or Biostimulatory Substances ground waters is better than the quality of those Water shall not contain biostimulatory substances waters established in a basin plan as objectives, the which promote aquatic growths in concentrations existing quality will be maintained unless as that cause nuisance or adversely affect beneficial otherwise provided by Resolution No. 68-16 or any uses. revisions thereto. This policy and others establish general objectives. The State Board's water quality Chemical Constituents control plans applicable to sub-basins 5A, 5B, and 5C are the Thermal Plan and the Delta Plan. The Waters shall not contain chemical constituents in 1 Thermal Plan and its WQOs are in the Appendix. concentrations that adversely affect beneficial uses. The Delta Plan WQOs are listed as Table III-5. The Water designated for use as domestic or municipal State Board's plans and policies that the Basin Plan supply (MUN) shall not contain concentrations of must conform to are addressed in Chapter IV, chemical constituents in excess of the maximum Implementation. contaminant levels specified in the California Code of Regulations, Title 22, Division 4, Chapter 15. III-2