2017-05-08_REPORT - C1982056 (3)

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Well 008 -AU -3 and surface water site 30� monitor water levels upstream from the Fish Creek Tipple areawith data presented on Figure 44. The furthest downgradient Fish Creek alluvial monitorm well is 008 -AW -3 (Figure i 46) located near the Fish Creek Tipple. No unusual water level fluctuations were noted at any of these sites during 2016. Similarly, conductivity values for these two sites were within historical ranges. Trout Creek Alluvial Groundwater: There are two Trout Creek alluvial monitoring wells, 008 -AT -1, and a privately owned well (Jones well). Note that 008 -AT -1 was destroyed sometime in 2013. The well was replaced in 2014. Figures 48 through 51 provide graphical representations of water level and field conductivity information to date. Note that water levels are about 3 feet higher than historical, which may relate to the new well location and proximity to Trout Creek.. Tables 27 and 28 provide data for these wells. Well 008 -AT -1 is monitored in conjunction with surface water site 1005. Figure 48 depicts several water years for 008 -AT -1 for comparison. Monitoring was initiated on Trout Creek Alluvial wells back in 1994. Figure 49 shows TDS values for 008 -AT -1. TDS concentrations had been rising slowly since 2006, but dropped around the time the well was destroyed, and recovered sometime after the well was replaced. Note that the Jones well has historically been monitored to access potential mine impacts to the Jone's potable water well. In the fall of 2008, TC provided the Jones family with underground water storage tanks, a new plumbing system, and imported water, so that they could discontinue use of the well. At that time, the old plumbing system to the Jones well was decommissioned eliminating alluvial water sampling access. TC is in discussions with Mr. Richard Jones about discontinuing supply him water. TC will evaluate this monitoring point in 2017, and discuss further with CDRMS. Middle Creek Alluvial Groundwater: TC has no active Middle creek alluvial wells. Two Middle Creek alluvial wells (AVM -1 and AVM -2) were incorporated into the monitoring network during 1996, however, per TR03-42, these wells were abandoned in the Fall of 2003. Refer to previous AHRs for earlier data. 3.21 Points of Compliance Rule 4.05.13(1)(b) requires formal establishment of ground water points of compliance for coal operAtion which has the potential for negatively impacting the quality of ground water for which quality standards have been established by the Colorado Water Quality Control Commission. The Commission's Rule 41 sets forth Basic Standards for ground Water. These Standards are applicable to ground water at the Foidel Creek Mine. In the judgment of DRMS, these Standards are applicable to ground water at the Foidel Creek Mine, however it is'also the judgment of DBMS, the Foidel Creek Mine does not have the potential to negatively impact bedrock aquifers due to the nature of the geology (i.e. synch I 'al basin) found at the mine's location. Wells 008 -AV -2 (Fo�del Creek alluvium), 008 -AU -3 (Fish Creek alluvium), and w 1 008 -AT -1 (Trout Creek alluvium) will satisfy the requirements for alluvial ground water points of compliance. 10