2015-03-18_REPORT - C1982056 (4)

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3.6 CDPS Discharge Sites Under State of Colorado Department of Public Health and Environment (CDPHE), Colorado Discharge Permit System (CDPS) permit No.'s CO- 0027154, CO- 0036684, and CO- 0042161, eleven discharge points are monitored throughout the year. Note that CDPS has also been referred to as the National Pollutant Discharge Elimination System (NPDES) in previous AHRs. Monitoring results (CDPHE Colorado Discharge Monitoring Reports, or DMRs) are copied to DRMS in accordance with CDPS requirements. Tables 54 through 60 provide 2014 and historical data summaries for those CDPS outfall points. Figures 110 through 116 provide graphical representations of the 2014 flow rate and field conductivity data for the discharge ponds. Note that ponds A (former Outfall 001A), and H (former Outfall 009A) were deactivated following Phase III Bond release of the Eckman Park area, and were subsequently removed from the newly amended CDPS permit on January 1, 2002. In late 2011 and early 2014, the Fish Creek Tipple area was reclaimed. This along with the 2014 drought appears to have resulted in decreased discharge at the site. Construction Dewatering Permit COG - 850051 In July 2006, Twentymile Coal contacted CDPHE regarding the addition of this site (drainage for 6MN Pad area and construction dewatering pond) and later submitted a Temporary Construction Dewatering — Wastewater Discharge Application, which was subsequently approved ( Outfall 001 A under CO- G072272). CDPHE requested preliminary analyses of this water for alkalinity, COD, pH and TDS. A sample was collected and analyzed for these parameters. A discharge channel was constructed in late July 2006, and weekly monitoring of discharge from outfall 001A began in August 2006. Note that water was pumped from the sedimentation pond through 001A on an as needed/ sporadic basis. Pump flows were estimated. CDPHE Discharge Monitoring Reports are copied to DRMS. TC subsequently applied for a CDPS permit to make 6MN a permanent Outfall. A permit (COG- 850051) was subsequently approved in January 2010 by CDPHE, effective February 1, 2010, expiring June 30, 2014. Outfall 001 A did not discharge in 2014, undoubtedly the result of low snow melt in the immediate area. CDPHE Discharge Permit COG - 850054 The 18 Left Vent Fan Pad area drains into two sedimentation ponds which could discharge into a small unnamed tributary leading to Fish Creek. In February 2014, TC submitted an application to CDPHE to make this a permanent CDPS site (also see TR09 -70). A permit (COG- 850054) was subsequently approved by CDPHE, effective April 15, 2010, expiring June 30, 2014. DRMS is copied on CDPHE DMRs for this site. There was no discharge in 2014. 14