Laserfiche WebLink
SUNDAY MINE COMPLEX-HYDROGEOLOGIC REPORT <br /> sump that had been filled by pumping from the DLS-6 site, which was in the working <br /> face of a production stope. The DLS-6 site elevation is the same elevation reported in <br /> April 2009 and is considered a static level. This elevation is approximately 100 ft above <br /> elevations measured at other mine workings. <br /> • Denison installed four underground monitoring wells in February 2009 in the West <br /> Sunday Mine to investigate local ambient water quality signatures and relationships <br /> between the Top (Upper) Rim Sandstone and an underlying siltstone unit both within the <br /> Salt Wash Member of the Morrison Formation (see Figure 8-1 in Appendix D). The wells <br /> were collared immediately upgradient of a flooded portion of the mine (as discussed <br /> above). Denison found that in the dry area immediately upgradient of the flooded <br /> workings, the drill holes were unsaturated, but the holes were saturated after penetrating <br /> zones where the workings were flooded. The water quality results are discussed in <br /> Section 10.0. <br /> Vent Hole Observations <br /> • Denison measured water level elevations in two Vent Shaft, S-4 and S-8, associated <br /> with the Sunday Mine workings on March 1, 2009 (see Figure 3-1). These elevations <br /> were 5,394 and 5,413 ft amsl, respectively. <br /> Drill Hole Observations <br /> • Denison drilled nine groundwater exploration drill holes in 2009 to investigate <br /> groundwater occurrence in the SMC mine area. Drilling was done by air rotary methods; <br /> it was assumed that injection of drilling fluids was not conducted. It should be noted that <br /> there was some reference to depths when groundwater was encountered, but not <br /> always. When drilling open boreholes, groundwater encountered at shallow depths, even <br /> in small quantities, can contribute to overall depth to water measurements conducted <br /> after the hole was completed at greater depths. Use of a resistivity probe may reduce <br /> some of this concern for measurements taken immediately after the drill hole is drilled. <br /> Denison reported that they used normal resistivity methods. Normal resistivity logs are <br /> usually conducted with the borehole full of water or other fluid. Single point resistivity <br /> methods that can be conducted without fluid-filled borehole may have been used <br /> instead. Regardless, the following water level measurements from these drill holes <br /> should be used with caution. <br /> Western Water& Land, Inc. 24 <br />