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PERMFILE53621
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PERMFILE53621
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Entry Properties
Last modified
8/24/2016 10:57:00 PM
Creation date
11/20/2007 3:51:30 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
Permit File
Doc Date
3/16/2001
Doc Name
Annual Hydrology Report
Section_Exhibit Name
Appendix W 2000 Report Section 2.0
Media Type
D
Archive
No
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III IIIIIIIII IIII III Doc Date:12111/2001 <br />sss <br />~ ~ Pe..,d., X <br />• SECTION 2.0 Annual Hydrology Report for Trapper Mine (2000) ~~H~ <br />2.1 Climatological Data <br />The 2000 National Weather Service Cooperative monthly summaries and the historical precipitation <br />summary (1978-2000) are inclutled in Section 2.5. 2000 precipitation totaling 15.93", provided 117 <br />percent of the established historical pre-mining (44-YR) annual precipitation mean (Figure 2-1). The <br />highest monthly precipitation amount was recorded in September (2.25') with the second highest total <br />occurring in February (2.00°). Precipitation amounts were well below normal for the months of April, May, <br />June, Juty, and October. In terms of project-to~ate monthly average precipitation amounts, 2000 finished <br />with precipitation totaling 95°k of the project to date average. However, the distribution resulted in a much <br />drier than usual growing season. Much of the September total (1.46°} occurred as the result of a single <br />large storm event. <br />2.2 Pk Dewatering and Consumptive Water Use for 2000 <br />During 2000, Trapper dewatered approximately 45 acre-feet of water from three active pits. (Table 1-1 of <br />Section 2.5 shows the pumping volumes for each pd). No additional dewatering from wells in Ashmore, <br />Derringer or Flintlock pit occurred during 2000. The dewatering wells in the Derringer and Flintlock pits <br />were rendered inoperable during 1998 as mining operations progressed beyond their areas of influence. <br />No new dewatering wells were established in 1999 or 2000. All pit water was routed into the NPDES <br />drainage system with resulting discharges monitored accordingty. Pit dewatering volumes were markedty <br />lower in 2000 as compared to 1999 due to the unusually dry summer and fall. <br />Approximatety 62 acre-feet of water were used for dust suppression on haul roads and topsoil handling <br />operations in 2000. This quantity is slightty lower than the 1999 total. As previousty noted, the summer <br />• months of 2000 were drier than usual. However, dust suppression water demands were somewhat offset <br />by the successful application of dust suppression chemical treatments on haulroads during 2000. Total <br />water volume used by Trapper Mine in 1999 was approximatety 107 acre-feet, lower than the 1988 total <br />primarily due to the talc of pit dewatering. <br />2.3 Mining Advancement and Ash Disposal Skes <br />The 2000 Annual Hydrology Report maps depict the following mining activities through yearend: <br />a) Project to date utility waste disposal sites. <br />b) Project to date pit advancement (Tce of pk). <br />c) Project to date monitoring and dewatering wells; and natural and spoil springs and seeps. In the <br />2000 report, all spring and seep sites within the permit area are depicted to provide location <br />information for future reference. Skes that exhibited flows exceeding 5 gpm during the reporting <br />year are distinguished from sites exhibiting flows less than 5 gpm. <br />Three maps (Annual Hydrologic Report Map 2, Sheets 1, 2, 8 3) are provided to present this information. <br />These maps include the locations of monitoring wells that are proximal to active mining and that could be <br />affected in this permit term. <br />2.4 Monitoring Points <br />Rather than submitting an additional map series, please refer to current Permit No. C-81-010, Map M52, <br />for locations of all the operational hydrologic monitoring points. No new ground water monitoring wells <br />were installed during 2000. <br />Two additional NPDES discharge points (East Flume Gulch and Horse Gulch) were completed during the <br />• fall of 2000. Neither of these ponds discharged during the year. <br />No new pit dewatering wells were installed during 2000. <br />
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