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iii iiiiiiiiiiiii iii <br />sss <br />Doc Date:12/11I2001 <br />~~ ~~SECTION 2.0 Annual Hydrology Report for Trapper 114ine (1989) <br />Section 4.8.5 of our mining permit requires Trapper provide the CMLRD with an anm~al <br />hydrology report (AHR). <br />2.1 Climatological Data <br />We are submitting the 1989 NWS Cooperative summaries and a historical monthly <br />precipitation summary (1979-1989). Trapper has been the official NOAH station near <br />Craig, Colorado, since 1979. <br />2.2 Pit Dewatering Data for 1989 <br />During 1989, Trapper pumped 121.8 acre-feet from all pits and an additional 33.5 acre- <br />feet of water from the three dewatering wells in Derringer pit. Tables 2.2a and 2.2b <br />(Section 2.5) show the monthly pumping hours and corresponding water volumes for <br />each pit. The 121.3 acre-feet represent a 6% increase in pump dewatering over 1988, <br />which is directly related to the dewatering of Brasil and Sims pit prior to Browning pit's <br />stripping. There was no dewatering necessary for Ashmore or Enfield pits again this <br />year (Table 2.2a). <br />.` Pumping from the three Derringer pit dewatering wells (Table 2.2b) shows Trapper <br />pumped 33.49 acre-feet of water from the boxcut toe and spoils. This is an increase of <br />210% over 1988 pumping. In 1989, a second well was activated in January and the third <br />well was installed and activated in June. The same installation specifications used for the <br />1988 wells (filed in the 1988 report, Figures 2.2-1 to 2.2-4.) were used for the 1989.vell. <br />2.3 Mining Advancement and Ash Disposal Sites <br />Enclosed is a revised Annual Hydrology Report (AHR) map for 1989 which shows the <br />following mining activities through year end: <br />a. Project-to-date (PTD) utility waste disposal. <br />b. PTD pit advancement. <br />c. PTD proximal monitoring and dewatering wells, plus spoil seeps >5 gpm. <br />2.4 Monitoring Points PTD <br />Rather than submitting a separate map with this report, we refer the Division to the cur- <br />rent Map M52 which shows our operational hydrologic monitoring points. Operations <br />added one dewatering well in Derringer pit in 1989. <br />2.5 1989 Hydrological Data <br />*~ Enclosed is Hydro-Engineering Inc.'s collation of the 1989 hydrological data for Trapper <br />Mine. The report addresses: <br /> <br />