Laserfiche WebLink
has increased approximately 15 feet since 1997, or 1.3 feet per year on average. P-8 <br />is located where the workings once day-lighted in the south wall of the North Pit. <br />Springs occur in this area (CFS and CFS-2) and perhaps the water is slowly filling <br />the secondary porosity in the bedrock resulting in increased water levels in the <br />piezometer. The fractured nature of the rock within the fault zone may also enhance <br />infiltration of water from the springs. Therefore, water in the Pinnacle workings does <br />not appear to be the cause of the slightly increasing water level in P-8. Additionally, <br />precipitation does not appear to be responsible for the increasing water levels <br />because the water level trend has been linear over a 13-year period and one would <br />expect a noticeable change in the rate of increase corresponding to wet or dry years. <br />Flow from the Chester Fault Zone into the North Pit Lake is measured at CFS and <br />CFS-2, which are springs located on the south wall of the pit (Figure 1). The flow <br />from CFS has been measured since fall 1999 and has ranged from 0.5 to 7.2 gpm. <br />The flow from CFS-2 has been measured since fall 2002 and has a similar range <br />from 0.4 to 4.4 gpm. Review of the flow measurements reveals that there is no <br />apparent increase in the flow rate from these springs into the North Pit Lake. <br />4.3.3 Pinnacle Adit Flow <br />The flow rate from the Pinnacle Adit at PP-01 has been monitored since November <br />1993. The flow from the adit remains in a seasonal pattern of high flows during the <br />short period of spring melt in late May or early June and stable flows of less than 10 <br />gallons per minute (gpm) throughout the year. The measured peak flow for the 2010 <br />season was 22.6 gpm on June 3, 2010. This was lower than the peak discharge in <br />2008 of 40.7 gpm and 2009 of 22.9 gpm. A hydrograph of the Pinnacle Adit flow at <br />' PP-01 is provided as Figure 5. The spike in flows observed at PP-01 each spring <br />are likely a result of snowmelt and runoff from surrounding sources originating <br />between the Pinnacle plug and the PP-01 monitoring point. Once the snowmelt <br />period is over, the flow rate at PP-01 decreases and stabilizes at normal levels. <br />4.3.4 Radium and Uranium Concentrations at PP-01 <br />Dissolved radium 226 and total uranium have been monitored at PP-01 since March <br />1994. After construction of the Pinnacle Adit plug in September 1995, both the <br />dissolved radium 226 and total uranium concentrations have stabilized at reduced <br />concentrations. A graph of the radium and uranium concentrations at PP-01 is <br />provided as Figure 6. During 2010, total uranium and dissolved radium 226 levels <br />Pitch Reclamation Project <br />Colorado Mined Land <br />Reclamation Board <br />2010 Annual <br />Reclamation Report <br />22