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3.7 CDPS Discharge Sites <br />Under State of Colorado Department of Public Health and Environment (CDPHE), Colorado Discharge Permit <br />System (CDPS) permit No.'s CO-0027154, CO-0036684, and CO-0042161, eleven discharge points are <br />monitored throughout the year. Note that CDPS has also been referred to as the National Pollutant Discharge <br />Elimination System (NPDES) in previous AHRs. Monitoring results (CDPHE Colorado Discharge Monitoring <br />Reports, or DMRs) are copied to DRMS in accordance with CDPS requirements. Tables 54 through 60 provide <br />2007 and historical data summaries for those CDPS outfall points. Figures 112 through 115 provide graphical <br />representations of the 2007 flow rate and field conductivity data for Pond D at the Foidel Creek Mine and for <br />Pond E at the Fish Creek Tipple. Figure 116 depicts period of record total recoverable iron data for Pond E. <br />Note that ponds A (former Outfall OOlA), and H (former Outfall 009A) were deactivated following Phase III <br />Bond release of the Eckman Park area, and were subsequently removed from the newly amended CDPS permit <br />on January 1, 2002. <br />Construction Dewaterin~ Permit CO-6072272 <br />In July 2006, Twentymile Coal contacted CDPHE regarding the addition of this site and later submitted a <br />Construction Dewatering -Wastewater Discharge Application, which was subsequently approved (Outfa11001A <br />under CO-6072272). CDPHE requested preliminary analyses of this water for alkalinity, COD, pH and TDS. A <br />sample was collected and analyzed for these parameters. A discharge channel was constructed in late July 2006, <br />and weekly monitoring of discharge from outfa11001A began in August 2006. Note that water was pumped from <br />the sedimentation pond through OOlA on an as needed/ sporadic basis. Pump flows were estimated. CDPHE <br />Discharge Monitoring Reports are copied to DRMS. <br />In summary, Outfa11001A was recorded as flowing in March 2007 for approximately 3 consecutive days. There <br />was no further flow in 2007. No exceedances were noted. TCC anticipates turning this site into a permanent <br />CDPS site in the summer of 2008. <br />3.8 2007 Inflow Survey <br />During the fall of 2007, an inflow study was conducted. Flow rates and field parameters were recorded for <br />measurable inflows from the accessible areas of the underground mine. Results of the 2007 survey are presented <br />on Figure 117, 2007 Inflow Study Mined Area (in map pouch at back of report). <br />The WMD was closed in 1996 at that time inflows were 52 gpm. Note that water elevations for the WMD were <br />monitored periodically at the Fish Creek Borehole. Our best estimate is that inflows for the WMD are still on the <br />order of 50 gpm. <br />Longwall mining was completed in the EMD by early-January 2001. Production from the NMD, 12 Rt Longwall <br />• Panel, was underway by late January 2001. The EMD was permanently sealed in October 2001 removing all <br />access to the 6 Rt and 7 Rt gate roads. Thus, no measurements are available in this area for 2006. Historical data <br />13 <br />