Laserfiche WebLink
7 <br /> <br />The water level in Hole 30-8M was confirmed dry at 464.5 feet. This is the same <br />elevation as last year. This well is located in a pillar next to the start line for LWB-8. This <br />pillar was developed in September 2006. A substantial decrease in water level was noted <br />following the development work. <br /> <br /> The water level in Hole 31-7M fell 0.2 feet. This well is up gradient from mining activity <br />and the water level fluctuation is minimal. <br /> <br />Monitoring Hole 32-7M was plugged in August 2010 to eliminate connection with the <br />sealed off portion of the mine. <br /> <br />33-8M experienced a slight rise in water level of 1.1 feet, within the normally expected <br />range of fluctuation. <br /> <br />The hydrographs of the "lower sandstone facies" are designated by the letter "L" following <br />the hole number. <br /> <br />Hole 2-17L showed a rise of 13.5 feet from the prior year. This change is attributed to the <br />fluctuation in water level within the D-seam workings. <br /> <br />Hole 4-20L showed a rise of 0.6 feet from the prior year. <br /> <br />Monitoring Hole 32-7L was plugged in February 2001 to eliminate connection with the <br />sealed off portion of the mine. <br /> <br />Hole 33-8L showed a 0.2 foot rise in the depth to water. This response is similar to the <br />adjacent 33-8M and 33-8U holes. <br /> <br />Monitoring hole 22-2L was completed in October 2005 for monitoring future mine <br />expansion. This hole recorded a 272.4 foot drop in head over the prior year. This <br />fluctuation indicates that the development workings are influencing this confined zone <br />from 750 feet away. Connectivity with development workings in the mains could be <br />through ancient stream channels. Given that this is a small confined water system in a <br />tight formation small changes can produce great fluctuations in head. Other abrupt <br />changes in water level were observed at this site shortly following its construction (see <br />Appendix D-14). <br /> <br />From the baseline data, all three zones should be classified as "aquitards" in that they will <br />yield water but at very slow rates. Mining in the B Seam has encountered only small <br />flows of water and the mine is essentially dry. Typical inflows are in the order of 25 to 40 <br />gpm (includes water resulting from leaks, water line brakes, production equipment and