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19 <br />• <br /> Table III. Environmental St andards for Water. <br /> Concentrations a re in mg/1 unless noted. <br /> EPA Limitations <br /> for Cu, Pb, Zn, Au, and Ag <br /> Drinking Drinking Suggested Mines <br />h <br />9 <br /> Water Water Criteria BATEA <br />BPCTCA <br /> before after for aquatic 30 day 24 hr 30 day 24 hr <br /> Source 1975 1975 life avg. max. avg. max. <br /> Reference (8) (48,49) (8) (2) (2) (2) (2) <br /> Arsenic 0.0100.050b 0.05e 1.0 <br /> Barium 1.0b 1.0e - <br /> Cadmium 0.010b 0.010e 0.010 <br /> Chromium(VI) 0.050b O.OSe 0.050d <br /> Cobalt - - 0.50 <br /> Copper 1.0a 1.0f 0.01-0.02 0.05 0.1 0.05 0.10 <br /> Cyanide 0.010a0.200b <br />• 0 <br />30a <br />3f 30 <br />0 <br /> Iron . <br />0. . <br /> Lead 0.050b 0.05e 0.005-0.01 0.2 0.4 0.1 0.2 <br /> Manganese 0.05a 0.05f 1.0 <br /> Mercury 0.005b 0.002e 0.001 0.001 0.002 0.001 0.002 <br /> Nickel 0.050 <br /> Selenium 0.01b 0.01e 1.0 <br /> Silver 0.05b 0.05e 0.0001 <br /> Zinc 5.0a 5.0f 0.03-0.07 0.5 1.0 0.5 1.0 <br /> Sulfate 250a 250f <br /> Total dis- <br /> solved Solids 500a <br /> pHc 6.0-9.0 6.5-8.5 6-9 6-9 6-9 6-9 <br /> a Recommended limit a Maximum contaminant levels (48) <br /> b Maximum permissible concentration f Recommended maximum secondary <br /> c Hydrogen ion concentration in pH units contaminant levels proposed by <br />. d Total chromium- drinking water standard EPA (44) and adopted by the <br /> is hexavalent chromium Colorado Water Quality Control <br /> Commission (50) <br /> g Best Practicable Control Technology Currently Available <br /> h Best Available Technology Economically Achievable