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<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />season was 31.0 gpm on June 5, 2007. A hydrograph of the Pinnacle Adit flow at PP- <br />01 is provided as Figure 5. The spike in flows observed at PP-01 each spring are <br />likely a result of snowmelt and runoff from surrounding sources originating between the <br />Pinnacle plug and the PP-01 discharge point. Once the snowmelt period is over the <br />discharge at PP-01 decreases and stabilizes at normal levels. <br />4.3.4 Radium and Uranium Concenltrations at PP-01 <br />Dissolved radium 226 and total ui <br />1994. After construction of the <br />dissolved radium 226 and total i <br />concentrations. A graph of the <br />provided as Figure 6. During 2( <br />remained at the reduced concer <br />period. <br />ium have been monitored at PP-01 since March <br />nnacle Adit plug in September 1995, both the <br />nium concentrations have stabilized at reduced <br />odium and uranium concentrations at PP-01 is <br />total uranium and dissolved radium 226 levels <br />~tions observed over the preceding twelve-year <br />' 4.4 Sediment Control Embankment <br />The safety and efficiency of the se Idiment embankment is monitored with a network of <br />' surface and subsurface systems. 'There are five (5) permanent survey monuments <br />where any physical movement of the embankment can be measured and nine (9) <br />piezometers have been installed to monitor the phreatic surface within the <br />embankment. Five of the piezometers were installed during the initial construction in <br />' 1980, and four of the piezometerswere completed in the core of the embankment in <br />2001. The 2007 monument survey was performed on October 20 and results indicate <br />the amount of vertical movement is minimal and within the range of survey error. No <br />significant vertical displacement has occurred since the initial settlement following <br />construction. <br />' Snow melt in the spring of 2007 was substantially down as compared to 2005, when <br />water stored in the sediment pond ~I~eached an elevation of 9893.5 ft amsl (6.5 ft below <br />the spillway). During 2007, the maximum water elevation in the pond was recorded at <br />' 9887.5 ft. amsl with the average elevation maintained at 9884.9 ft amsl. Seepage that <br />was observed on the downstream face of the embankment in June 2000, and <br />discussed in the 2000 and 2001 ~'~annual reports, has not reappeared following the <br />' repair work conducted in 2001. The monuments and piezometers will continue to be <br />monitored in 2008. <br /> <br /> <br />Pitch Reclamation Project <br />Colorado Mined Land <br />Reclamation Board <br />2007 Annual <br />Reclamation Report <br />17 <br />1 <br />