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Minrec, Incorporated Water Quality Assessment <br />Table A -3 <br />In- stream Standards for Stream Segment COUCRFIO <br />Physical and Biological <br />Dissolved Oxygen (DO) = 6 mg /1, minimum (7 mg /1, minimum during spawning) <br />pH= 6.5 -9su <br />E. coli chronic = 126 colonies /100 ml <br />Temperature = TVS(CS -I) °C <br />CO- 0048233 <br />Inorganic <br />Total Ammonia acute and chronic = TVS <br />Chlorine acute = 0.019 mg /1 <br />Chlorine chronic = 0.011 mg /1 <br />Free Cyanide acute = 0.005 mg /1 <br />Sulfide chronic = 0.002 mg /1 <br />Boron chronic = 0.75 mg /1 <br />Nitrite acute = 0.05 mg /1 <br />Nitrate acute = 10 mg /1 <br />Chloride chronic = 250 mg /1 <br />Sulfate chronic = For WS, the greater of ambient water quality as of January 1, 2000 or 250 mg /1 <br />Metals <br />Dissolved Arsenic acute = 340 µg /l <br />Total Recoverable Arsenic chronic = 0.02 µg /1 <br />Dissolved Cadmium acute for trout and Dissolved Cadmium chronic = TVS <br />Total Recoverable Trivalent Chromium acute = 50 µg /1 <br />Dissolved Hexavalent Chromium acute and chronic =TVS <br />Dissolved Copper acute and chronic = TVS <br />Dissolved Iron chronic= For WS, the greater of ambient water quality as of January 1, 2000, or 300 ug /1 <br />Total Recoverable Iron chronic = 1000 µg /l <br />Dissolved Lead acute and chronic = TVS <br />Dissolved Manganese chronic = For WS, the greater of ambient water quality as of January 1, 2000, or 50 ug /l <br />Dissolved Manganese acute and chronic = TVS <br />Total Mercury chronic = 0.01 µg /l <br />Dissolved Nickel acute and chronic = TVS <br />Dissolved Selenium acute and chronic = TVS <br />Dissolved Silver acute and Dissolved Silver chronic for trout = TVS <br />Dissolved Zinc acute and Dissolved Zinc chronic for sculpin* = TVS <br />*Sculpin equation only applies when the receiving stream hardness is less than 113 mg /1 <br />Table Value Standards and Hardness Calculations <br />Standards for metals are generally shown in the regulations as Table Value Standards (TVS), and these <br />often must be derived from equations that depend on the receiving stream hardness or species of fish <br />present. The Classification and Numeric Standards documents for each basin include a specification for <br />appropriate hardness values to be used. Specifically, the regulations state that: <br />The hardness values used in calculating the appropriate metal standard should be based on <br />the lower 95% confidence limit of the mean hardness value at the periodic low flow criteria <br />as determined from a regression analysis of site - specific data. Where insufficient site - specific <br />Appendix A (wQA v 7.0) Page 7 of 25 Last Revised Sept 14, 2009 /ES <br />