Laserfiche WebLink
fairly steady for the remainder of the year and in 2007 water levels gradually increased. These <br />water level declines are thought to be due to drilling for deeper coal in this area. Backfill well GD- <br />3 is approximately 1200 feet upgradient of well GD-2. It is topographically higher and closer to D <br />pit. Water-level changes in well GD-3 have been more gradual than changes in well GD-2. The <br />unconfined backfill aquifer's storage parameter would be much larger than the storage coefficient <br />for the confined aquifer at GD-2 and, therefore, would be expected to dampen responses. <br />Waxer levels. in well GP-9 gradually increased in 2007 until a sharp decline occurred in <br />the fourth quarter. This waxer-level change is likely natural except for the fourth quarter drop which <br />needs additional monitoring before any significance should be given this value. An early 2008 <br />water level shows that the fourth quarter level is likely an error. <br />Figure A-4 presents water levels for wells GF-7 and P-8. These wells are completed in <br />the HI backfill and 3rd White Sandstone aquifers, respectively. Water levels in well GF-5 (see <br />• Figure A-1) and GF-7 (see Figure A-6) were steady in 2007 (both completed in the HI bacld'ill). <br />The larger storage value in the unconfined backfill aquifer may dampen the effects of dry and wet <br />years. The recovery from the A pit mining in this area may be complete. The water levels in well <br />P-8 were fairly steady in 2007. <br />Waxer levels for well GF-4 are presented in Figure A-5. A large rise in water level in <br />well GF-4 was observed in the last half of 1999 after the repair of the casing on September 29, <br />1999. Water levels overall gradually increased in 2007 in well GF-4 except for a larger increase in <br />the fourth quarter due to recharge. Mining occurred south of well GF-4 in the early 1980's and is <br />expected to limit water-level changes in the HI aquifer near well GF-4. Water levels in the <br />upgradient unconfined backfill aquifer do not fluctuate as much as the confined HI aquifer. It is <br />also possible that the backfill spring in Johnson Gulch may be limiting the head in the backfill <br />aquifer. <br />Trapper Mining Company 2-5 <br />2007 Annual Report <br />