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2.0 HYDROLOGIC MONITORING NETWORK <br />The monitoring network is a modification of the network used during baseline monitoring. <br />Continuous streamflow was historically collected from 2 sites (TR-a and TR-b) on Trout Creek <br />from May through October. TR-a was located above the mine and TR-b was located below the <br />Moffat area. Surface water quality samples were historically collected above and below the mine <br />at TR-A and TR-D, respectively. Additional historic surface water sampling sites along Trout <br />Creek were TR-B (located adjacent to the East Ridge area) and TR-C (located adjacent to the <br />Moffat area). Surface water flow monitoring sites TR-a and TR-b and surface water quality <br />monitoring sites TR-A, TR-B, TR-C and TR-D were discontinued September 2, 2009 in <br />accordance with TR-48. All surface water sites had been removed from the monitoring network <br />prior to 2010. This report does not replicate data collected prior to 2010; therefore the Surface <br />Water section has been removed. Historic water monitoring locations are shown on Plate 1. <br />Ground water levels were historically collected from 10 wells (215W, 215L, 218W, 218L, <br />M892S, M892L, TR-1.5, TR-3, TR-4 and WR-1). Ground water quality was historically <br />collected from 5 wells (TR-1.5, TR-3, TR-4, WR-1 and TCS-1). Three wells were completed in <br />the alluvium along Trout Creek (TR-1.5, TR-3 and TR-4) and one well was completed in the <br />spoils (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 TR-47. <br />Monitoring wells TR-1.5, TR-3, TR-4, WR-1 and TCS-1 were discontinued September 2, 2009 <br />in accordance with TR-48. All ground water sites had been removed from the monitoring <br />network prior to 2010. This report does not replicate data collected prior to 2010; therefore the <br />Ground Water section has been removed. Historic water monitoring locations are shown on <br />Plate 1. <br />2.1 NPDES Monitoring <br />Monitoring of point discharges from sedimentation impoundments is accomplished under <br />Colorado Department of Public Health and Environment Colorado Permit Discharge System <br />Permit CO-0032638. Copies of required Discharge Monitoring Reports are provided to the <br />Colorado Division of Reclamation, Mining and Safety under separate cover, and are included in <br />this report by reference. <br />Page 2 <br />'^W WCENGINEERING