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Kaldenbach, Tom <br />From: Philip Hegeman [Phifip.Hegeman@state.co.us] <br />Sent: Tuesday, December 03, 2002 9:21 AM <br />To: Carla.Lenkey@state.co.us; tom.kaldenbach@state.co.us <br />Subject: RE: Permit CO-0032638, Edna Mine <br />Hi Tom, Carla asked me to update you concerning the standards on Trout <br />Creek, Yampa segment 13c. As you noted, in March 2002 Pittsburg and <br />Midway successfully argued in front of the Commission that the numeric <br />standards for secondary drinking water constituents, iron, manganese and <br />sulfate be changed. The basis was that these changes would eventually <br />be made anyway. The state's Basic Standards and Methodologies for <br />Surface Water had previously been amended to set water quality standards <br />for these constituents at ambient levels for segments designated for <br />water supply use. Segment 13c is designated for water supply use from <br />June through February. P&M argued that it would be a hardship if they <br />had to wait until the July, 2003 rulemaking hearing on the Upper <br />Colorado River basin. They would have had to wait until February, 2004 <br />before EPA would approve the amended standards. I am unsure as to what <br />liability they may have relative to their ability to meet permit limit <br />for manganese. Sounds like there are some problems there. <br />So, there is a seasonal SO4 standard which is set at ambient (actually, <br />the ambient level will be determined in the July, 2003 hearing rationale <br />document). There are also two sets of standards assigned for iron and <br />for manganese. One set represent the water supply based standards which <br />are set at ambient. The other set are the aquatic life based standards. <br />For iron, There is a chronic stadards of 1000 ug/I as total recoverable <br />iron. The aquatic life based manganese standards (acute and chronic) <br />are hardness based. <br />I hope this adequately responds to your questions. If you need more <br />info please feel free to either E-mail me or you can reach me at <br />303.692.3518. Thanks, Phil <br />»> "Kaldenbach, Tom" <tom.kaldenbach@state.co.us> 11/27102 10:53AM <br />»> <br />Carla, <br />When the letter regarding the manganese exceedance goes out, would you <br />please cc it to me. <br />Also, do you know if there are manganese and sulfate standards still <br />in <br />effect on the stream segment where the Edna Mine is located [Segment <br />13c <br />(Trout Creek above Fish Creek) in CWOCC's Region 12 of the Yampa River <br />basin] ? <br />I know that the mine operator, Pittsburgh and Midway Coal, <br />successfully <br />petitioned the CWOCC in early 2002 to have those standards removed. <br />Thanks again, <br />Tom <br />-----Original Message----- <br />