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SECTION 2.0 Annual Hydrology Report for Trapper Mine (1988) <br />Section 4.8.5 of our mining permit requires we provide the CMLRD with an annual hydrology report. We <br />are submitting both surtace and ground water summaries for 1988. <br />2.1 Climatological Data <br />We are submitting the 1988 cooperative summaries and a historical monthly precipitation summary (1979- <br />1989). Trapper has been the official NOAA station near Craig since 1979. <br />2.2 PR Dewaterina Data for 1988 <br />During 1988 we pumped 114.76 acre-feet of water from our active pits. Attached are tables 2.2 to show the <br />monthly pumping hours and corresponding water volumes for each pit. <br />WeWe also included the data from the Derringer Pit dewatering well that was installed in 1988. That well <br />pumped another 15.93 acre-feet from the boxcut toe and spoil piles. A second dewatering well was <br />installed in late 1988 but wasn't activated until 1989. Well designs and pump specifications for both wells <br />are attached. <br />Although the 114 acre-feet represent an 181°,6 increase in dewatering over 1987, that is directly related to <br />• dewatering the inactive Colt pit prior to restart of mining. There was no dewatering necessary for Ashmore <br />or Enfield pits during 1988, and Derringer pit dewatering was similar to 1987. <br />2.3 Mining Advancement and Ash Disposal Sites <br />We have Included the revised Annual Hydrology Report (AHR) map for 1988 which shows the following <br />mining activities through year end: <br />a. Project-to~ate (PTD) utility waste disposal. <br />b. PTD pit advancement. <br />c. PTD proximal montoring and dewatering wells, plus spoil seeps >5 gpm. <br />2.4 Monitoring Points PTD <br />Rather than submitting another map with this report, we refer the Division to Map M52 which shows our <br />operations hydrologic monitoring points. During 1988 we added wells GD-3, GF-11 and GLUX-1. <br />Operations added the two dewatering wells in Derringer pit. Miss Thompson has requested we plot all the <br />NPDES sites on the revised AHR map (Section 2.3); however, due to the distances from the mining areas <br />and map scales, this is not feasible. All sites are on Map M-52. <br />• <br />