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(COG -850051) was subsequently approved in January 2010 by CDPHE, effective February 1, 2010, expiring <br />June 30, 2016. The permit is currently under Administrative Extension with CDPHE. <br />Outfall 001A did not discharge in 2018. <br />CDPHE Discharge Permit COG -850054 <br />The 18 Left Vent Fan Pad area drains into two sedimentation ponds which could discharge into a small unnamed <br />tributary leading to Fish Creek. In February 2009, TC submitted an application to CDPHE to make this a <br />permanent CDPS site (also see TR09-70). A permit (COG -850054) was subsequently approved by CDPHE, <br />effective April 15, 2010, expiring June 30, 2016. The permit is currently under Administrative Extension with <br />CDPHE. DRMS is copied on CDPHE DMRs for this site. The site did not discharge in 2018. <br />3.7 Mine Water Discharge Sites <br />Four mine water discharge sites are currently associated with the TC operations are monitored. Site 109 <br />(Twentymile Facility) requires quarterly monitoring for flows, field parameters, and water quality samples (when <br />flowing). Note that this site has not discharged in about 20 years, and will not be discharging in the conceivable <br />future. Site 115 (Fish Creek Borehole) is monitored as a CDPS discharge point in accordance with the <br />requirements set forth under CDPS Permit No. CO -0042161. <br />Two other mine water discharge sites are discussed in greater detail under a subsection to Section 3.6 above. To <br />dewater the old WMD and EMD, pumps and piping were installed to direct mine water from the Fish Creek Vent <br />Shaft (FCVS) and IORT #1, to the Area # 1 Pit. Overflow from the Pit passes through site 7 to Pond D, and <br />subsequently through CDPS Outfall 005A to Foidel Creek. Site 7 requires quarterly analyses when flowing per <br />DRMS Permit No. C-82-056. Site 7 did not discharge in 2018 due to the high water demand from the washplant. <br />Outfall 005A requires weekly, twice monthly, monthly, and quarterly water quality sampling when flowing, <br />under CDPS Permit CO -0027154. <br />Note that mine water is pumped from underground to the surface (from the old WMD), and was historically <br />(beginning in 2005) treated via an electro -coagulation process at the surface, where water enters the 3 former <br />treatment ponds that can also be directed through discharge site 115, that can be directed to Fish Creek. This <br />form of treatment ceased around 2014. This water was pumped directly back into the mine for underground dust <br />suppression. Additional overflow piping was added so the treatments ponds cannot overflow. Overflow water is <br />directed back into the mine via a former pump well. <br />Site 115 had not discharged to Fish Creek since early 2005, but was reactivated in 2008 and 2009, both for a <br />limited times (i.e. approx. one to three months) with low flows (25 500 gpm). Site 115 discharged for a couple <br />of hours one day in early 2015 due to a broken pipeline, which was subsequently repaired. Following approval in <br />2017 from CDPHE and DRMS to use a flocculant for mine water treatment, the site discharged April through <br />early June of 2017 and briefly in May and June 2018. <br />15 <br />