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COLOR4DO DEPARTMENT OF PUBLIC HEALTH AND ENYIROXME1VT Water Quality Control Division <br />Rationale —Page 3, Permit No. CO- 004 &275 <br />Table IV -2: RP Analysis for Outfall 003 <br />Parameter <br />30 -Day Average <br />WQIBEL Reasonable <br />MEPC <br />(NLAPC) Potential <br />7-Day Ave or Daily Max <br />MEpC WQBEL Reasonable <br />(MAPC) Potexttial <br />Cd, Dis (µg11) <br />0 <br />6.2 <br />No <br />0 <br />19 <br />No <br />CrE3, Dis (µg/1) <br />0 <br />231 <br />No <br />0 <br />1773 <br />No <br />Cu, Dis ) <br />9 2 <br />29 <br />No <br />9.2 <br />50 <br />Na <br />No <br />Pb, Dis (µi/1} <br />0.61 <br />11 <br />No <br />0.6I <br />281 <br />Hg, Tot ° } <br />0.0047 <br />0.01 <br />No <br />168 <br />No <br />45 <br />Ni, Dis µg/1) <br />0 j <br />168 <br />Na <br />0 <br />1513 <br />No <br />No <br />Se, Dis (µ °) <br />3.6 <br />4.6 <br />Monitor <br />3.6 <br />18 <br />A& Dis µg/1 <br />Zn, Dis (µg/1 ) <br />0 <br />0 <br />3.5 <br />382 <br />No <br />No 1 <br />0 <br />0 <br />22 <br />379 <br />No <br />No <br />For Outfall 003, monitoring is required for selenium. This requirement will be effective immediately. <br />Table N -4r RP A-1—;e f n —C-11 nn. <br />Parameter <br />30 -Day Average <br />7 -Day Ave or 1 <br />MMEPC <br />WQBEL <br />(MAPC) <br />Reasonable <br />Potential <br />MEPC <br />WQBEL <br />(MAPC) <br />Cd, Dis µg/1) <br />0 <br />6.2 <br />No <br />0 <br />I7 <br />Cr+3, Dis ° <br />1.4 <br />231 <br />No <br />. I.4 <br />1773 <br />Cu, Dis µ° <br />12 <br />29 <br />No <br />12 <br />50 i <br />Pb, Dis <br />H. Tot °) <br />2 <br />0.0029 <br />11 <br />0.01 <br />No <br />No <br />8.4 <br />281 <br />NL Dis (µ <br />45 <br />168 <br />No <br />45 <br />1513 <br />Se Dis µa <br />13 <br />4.6 <br />Yes <br />13 <br />ZS <br />Ag, Dis ) <br />0 <br />0.S1 <br />No <br />0 <br />Zn, Dis (µ °) <br />0 <br />382 <br />Na <br />0 <br />379 <br />wily Max <br />Reasonable <br />Potential <br />No <br />No <br />No <br />No <br />No - <br />Monitor <br />No <br />Na ' <br />For Outfall 004, monitoring is required for acute selenium, and a limitation is required for chronic selenium. Based on facility data, <br />the limitation can be met and therefore the limitation is effective immediately. <br />3!Jv <br />'Andrew Neuhart <br />February 4, 2010 <br />