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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />o <br />-..I <br />o <br />~ <br /> <br />TABLE 1,1 EXISTING WATER QUALITY STANDARDS IN REGION XII <br /> <br />Most of the streams in Region XII are of very high quality. <br />They are typically classified for secondary contact <br />recreation, Class 1 cold water aquatic life, water supply <br />and agricultural uses. These classifications 'are usually <br />accompanied by the following numeric stream standards: <br /> <br />Physical and Biological <br /> <br />D.O. = 6.0 mg/l 7.0 mg/l spawning <br />pH = 6.5 - 9.0 <br />Fecal Coli forms = 200/100 ml <br /> <br />Inorganic mg/l <br /> <br />NH3 = 0,02 unionized <br />Residual C1 = 0.003 <br />Cyanide (free) = 0.005 <br />Sand H2S = 0.002 undis <br />Boron = 0.75 <br />Nitrite (N02) = 0.05 <br />Nitrate (N03) = 10.0 <br />Chloride (CI) = 250,0 <br />Sulfate (S04) = 250,0 <br /> <br />Metals mg/l <br /> <br />Arsenic (As) = 0.05 <br />Cadmium (Cd) = 0.0004 <br />Chromium (tri) = 0.05 <br />Chromium (hex) = 0.025 <br />Copper (Cu) = 0.005 <br />Lead (Pb) = 0.004 <br />Iron (Fe,sol) = 0.03 <br />Manganese (Mn,sol) = 0.05 <br />Mercury (dg) ~ 0.00005 <br />Nickel (NI) = 0.05 <br />Selenium (Se) = 0.01 <br />Silver (Ag) = 0,0001 <br />Zinc (Zn) = 0.05 <br />Iron (Fe,tot) = 1.0 <br />Manganese (Mn,tot) 1.0 <br /> <br />Exceptions to this general rule are: 1) segments with <br />primary contact recreation standards indicating low <br />background coliform levels; 2) waters with high quality <br />Class 1 and Class 2 classifications such as parks and <br />wilderness areas; 3) waters with background metal levels <br />exceeding the numeric standards listed above; and <br />4) temporary modifications to allow time for clean-up of <br />existing discharges. Exceptions based on Items 2) and 4) <br />are listed below. <br /> <br />-\~- <br /> <br />Ii <br />.',," <br />