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29 -4U had only a large drop in water level from the prior year (62.5 feet). This year's <br />decrease is a result of the longwall passing within 300 feet of this hole. <br />Well 33 -8U was obstructed by a dead rodent at 211.9 feet. This obstruction will most <br />likely decompose allowing future measurements. <br />The middle "siltstone -coal facies" monitoring holes are designated by an "M" following the <br />hole number. These monitor holes are open through the interval containing the D Seam <br />and B Seam. <br />Monitoring hole 22 -3M was drilled in November 2006 and is now the 'point of compliance'. <br />Depth to water data is included in Appendix D and annual qualitative data presented in <br />Appendix C. This hole has exhibited a very slow artesian flow since 2007. The flow rate <br />has reduced from 150 ml /minute in 2010 to 52 ml /minute in 2011. <br />Monitor hole TW2 -17M was surrounded by mining first in November 1985 but was not <br />intercepted in the workings. It is apparently located in a pillar completely surrounded by <br />open workings. At that time it showed virtually no response to development mining. In <br />February 1988 longwall panel 1 was mined to within about 900 feet of this hole. <br />Obviously, longwall mining disrupts the mined zone more than development mining, and <br />the water level in TW2 -17M did show a response to mining at that time. The water level <br />has steadily decreased since 1988 with a decrease of 0.1 feet since the last monitoring <br />period. <br />Water level in monitoring hole 29 -4M decreased 60.5 feet from the prior year. As with 29- <br />4U, this drop can be attributed to the longwall passing within 300 feet of this well. <br />The water level in Hole 30 -8M was confirmed dry at 464.5 feet. This is the same <br />elevation as last year. The prior four years of measurements may have been showing <br />residual water left in the casing. This well is located in a pillar next to the start line for <br />LWB -8. This pillar was developed in September 2006. A substantial decrease in water <br />level was noted following the development work. <br />Hole 31 -7M decreased in water level 0.3 feet. This well is up gradient from mining <br />activity and the water level fluctuation is minimal. <br />Monitoring Hole 32 -7M was plugged in September 2010 to eliminate connection with the <br />sealed off portion of the mine. This well remained dry since 2001. <br />33 -8M experienced a slight rise in water level of 1.6 feet, within the normally expected <br />range of fluctuation. <br />6 <br />