Laserfiche WebLink
DRMS CEMEX M1977-208 Quarterly Report <br />October 61 2008 <br />Page 2 <br />at CEM-005 on a semi-annual basis, and in the event the well shows signs of increased water <br />volume sufficient to sample, an attempt will be made to obtain a sample. <br />Although conclusive evidence as to the source of inflow into C-Pit has not been established, The <br />Northern Colorado Water Conservancy District completed lining a portion of the Boulder Feeder <br />Canal to the southwest of the C-Pit area, in case this is a contributing source. There has been no <br />in flow of water through the west high wall in C-Pit in this quarter. Observations continue, and <br />if other significant sources of inflow can be identified, corrective actions will be evaluated. <br />To reduce water levels in C-Pit, CEMEX maintains a pump and motor sufficient to pump water <br />into the spray tower for use as cooling water. This is a consumptive use consistent with all <br />applicable permit (DRMS and CDPHE) conditions. The pump that was installed and that began <br />operation in the second quarter of 2008 has been effective in lowering the water level <br />considerably at this location. CEMEX pumped C-Pit water until October 24, and then winterize <br />the pump and equipment, and reevaluate water levels in the second quarter of 2009. Less than a <br />half acre surface area remains in C-Pit, Cemex is planning to reduce this amount by half over the <br />winter. <br />No seeps or springs down gradient of C-Pit have been observed. As agreed upon in TR-9, we <br />will continue to monitor for the presence of seeps or springs. <br />Wildlife Monitoring <br />Consistent with the mining permit and subsequent Technical Revisions, CEMEX has monitored <br />the C-Pit area daily for signs of wildlife, including the presence of tracks and wildlife itself. <br />Ducks have been seen near but not in the main pond. Pigeons, rabbits, and coyote were observed <br />in the vicinity of C-Pit. A net was placed over C-Pit in 2007, but was damaged several times in <br />high winds. The vendor designs indicated the net would be sufficient to withstand snow and <br />wind loadings for this area. The net has been repaired and replaced several times. The netting <br />could no longer be repaired from wind damage was replaced with streamers tied to ropes in order <br />to deter water fowl. This provision is believed to provide a better deterrent for water fowl than <br />the net. Further, the risk to wildlife, concurrent with the drop in pH and improvement in water <br />quality, and steep sides of the pit, is believed to be minimal (see Technical Revision 10 JR-10)). <br />In over three years of daily monitoring, very limited wildlife has been observed. CEMEX has <br />requested permission to remove this condition of wildlife monitoring and netting from the <br />technical revision in TR-10 submitted September 24, 2008, which was approved by DRMS. <br />Future quarterly reports will continue to summarize any significant wildlife observations, but <br />daily inspections and records will no longer be required and reported on.