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<br />• <br />• <br />piezometers are provided in Figure 3. All seven piezometers fluctuate seasonally <br />with the highest levels in late May or early June. The water levels are sympathetic <br />with snowmelt and large precipitation events and decrease to stable levels after <br />these events. During 2006, the phreatic surfaces in all piezometers showed a <br />comparatively normal spring cycle. The seasonal low water levels observed in P-7 <br />and P-10 indicate gradual upward trends that have been observed since 2000. A <br />hydrograph of the piezometer water levels is provided as Figure 4. <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 2006 <br />season was 20.9 gpm on June 13, 2006. A hydrograph of the Pinnacle Adit flow at <br />PP-Ot 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 <br />the Pinnacle plug and the PP-01 discharge point. Once the snowmelt period is over <br />the discharge 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 2006, total uranium and dissolved radium 226 levels <br />remained at the reduced concentrations observed over the preceding eleven-year <br />period. <br />Pitch Reclamation <br />Project Colorado Mined <br />Land Reclamation Board <br />2006 Annual Reclamation <br />Report <br />14 <br />