Laserfiche WebLink
19 <br /> Table III. Environmental Standards for Water. <br /> Concentrations ar e in mg/1 unless noted. <br />• EPA Limitations <br /> for Cu, Pb, Zn, Au, and Ag <br /> Drinking Drinking Suggested Mines h <br />BPCTCAg BATEA <br /> Water Water <br />before after Criteria <br />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 0.010a0.050b 0.05e 1.0 <br /> Barium 1.0b 1.0e - <br /> Cadmium 0.010b 0.010e 0.010 <br /> Chromium(VI) 0.050b 0.05e 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 /> Iron 0.30a 0.3f 0.30 <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 />Soo <br /> solved Solid s <br /> pff 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 concentrati on 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 Technol ogy Economic ally Achievable