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The southwest area of TC (Eckman Park area), has been reclaimed and has been released from bond. In addition, <br />the former surface mine area referred to as Area 1 was released from bond in January 2002. As a result, the <br />Colorado Department of Public Health and Environment (CDPHE) subsequently approved eliminating Ponds A <br />(Eckman Park) and H (Area 1) from our ongoing NPDES monitoring program in 2002. <br />Since mid -1987, hydrologic monitoring and reporting has primarily been conducted by TC personnel. In May of <br />1995, a private firm (Miller Water Monitoring Service) was contracted to assist with hydrologic monitoring at the <br />TC sites, and continues to assist in monitoring to date. Prior to June 1986, water quality analyses were performed <br />by the on-site CYCC laboratory. From 1987 to 2000, water quality analyses were primarily performed by ACZ <br />Laboratories (formerly Bookcliffs) of Steamboat Springs, Colorado. From 2001 through 2005, water quality <br />analysis was primarily been performed by SGS North America laboratory of Denver, Colorado. Since mid - <br />2005, analyses are again primarily performed by ACZ Laboratory of Steamboat Springs, Colorado. Whole <br />Effluent Toxicity (WET) testing was historically conducted by SGS, but has been conducted by Aqua-Tox of <br />Wheatridge Colorado, since the summer of 2009. <br />Note that in 2003, DRMS approved TR03-42 (See Permit Exhibits 14-5, 14-6, and 14-10), and PR 03-06 (See <br />Permit Exhibits 14-7 through 14-9), which eliminated several surface, alluvial, and bedrock well monitoring sites, <br />and reduced the monitoring frequency of other sites, while adding additional monitoring requirements to existing <br />surface site 305 (located downstream at the time of Twentymile Park subsidence ). Data from terminated sites <br />can be found in previous AHRs. <br />Three former US Geologic Survey (USGS) surface water sites (USGS 09243700, USGS 09243800 and USGS <br />09243900) were monitored for flow by the USGS through the 2001 water year. Prior to the 1989 Water Year, the <br />USGS had collected and analyzed water quality samples from these sites. From the 1989 water year to date, TC <br />has collected water quality samples from these sites for laboratory analysis. Beginning with the 2002 water year, <br />TC took over monitoring of these three sites (referred to as sites 700, 800, and 900, respectively) from the USGS. <br />In 2003, TR03-42 eliminated site 700 on Middle Creek. <br />3.0 2015 HYDROLOGIC MONITORING PROGRAM <br />Specific monitoring site locations and their elevations are shown on Figure 2 (Map pouch at back of report). <br />Required monitoring frequencies are listed in Permit No. C-82-056, under Exhibit 14. 2015 data tables and <br />figures for each site are referenced in the following discussions. Statistical summaries of the historical data base <br />are provided after presentation of the 2015 data. <br />3.1 Bedrock Groundwater Monitoring <br />Hydromlogy: TC's underground Wadge mining operations are located roughly 1600 feet beneath the surface of <br />Twentymile Park Basin. This is an enclosed synclinal ground water basin, rimmed by outcrops of major <br />lithologic units. Ground water in the Twentymile Park Basin exists primarily under confined conditions within <br />the bedrock units. All ground water aquifers in the general area, except the alluvial aquifers, are recharged by <br />3 <br />