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2.0 HYDROLOGIC MONITORING NETWORK <br />The existing monitoring network is a modification of the network used during baseline <br />monitoring. Continuous streamflow was historically measured at two sites (TR -a and TR -b) on <br />Trout Creek from May through October. TR -a was located above the mine and TR -b was located <br />below the Moffat area. Surface water quality samples were historically collected above and <br />below the mine at TR -A and TR -D, respectively. Additional historic surface water sampling <br />sites along Trout Creek were TR -B (located adjacent to the East Ridge area) and TR -C (located <br />adjacent to the Moffat area). Surface water flow monitoring sites TR -a and TR -b and surface <br />water quality monitoring sites TR -A, TR -B, TR -C and TR -D were discontinued September 2, <br />2009 in accordance with Technical Revision 48. All surface water sites had been removed from <br />the monitoring network prior to 2012 (Plate 1). This report does not replicate data collected prior <br />to 2012; therefore the Surface Water section has been removed. <br />Groundwater levels were historically collected from 10 wells (215W, 215L, 218W, 218L, <br />M892S, M892L, TR -1.5, TR -3, TR -4 and WR -1). Groundwater quality was historically collected <br />from 5 wells (TR -1.5, TR -3, TR -4, WR -1 and TCS -1). Three wells were completed in the <br />alluvium along Trout Creek (TR -1.5, TR -3 and TR -4) and one well was completed in the spoils <br />(WR -1) located at the base of the West Ridge area. An additional water quality well was <br />completed in the Trout Creek Sandstone (TCS -1) monitored downdip of mining activity. <br />Additional ground water levels were collected from six wells (215W, 215L, 218W, 218L, <br />M892S and M892L) located in the Moffat area. Monitoring wells 215W, 215L, 218W, 218L, <br />M892S and M892L were discontinued September 21, 2007 in accordance with Technical <br />Revision 47. Monitoring wells TR -1.5, TR -3, TR -4, WR -1 and TCS -1 were discontinued <br />September 2, 2009 in accordance with Technical Revision 48. All groundwater sites were <br />removed from the monitoring network prior to 2012 (Plate 1). This report does not replicate data <br />collected prior to 2012; therefore the Groundwater section has been removed. <br />2.1 NPDES Monitoring <br />Monitoring of point discharge waters from sedimentation impoundments is performed under <br />Colorado Department of Public Health and Environment (CDPHE) National Pollutant Discharge <br />Elimination System (NPDES) Permit CO- 0032638. Discharge monitoring effluent associated <br />with DMP 004 and DMP 007 did not exceed any effluent limit compliance criteria during the <br />reporting period. Water quality records are reported on a monthly basis to the CDPHE. Copies <br />of required Discharge Monitoring Reports (DMR) are provided to the CDRMS under separate <br />cover, and are included in this report by reference. <br />V V vVCENGINEERING <br />Page 2 <br />