2011-03-15_REPORT - C1981010

• Permit No: C1981010
• IBM Index Class Name: Report
• Doc Date: 3/15/2011
• Doc Name: 2010 Annual Hydrology Report
• From: Trapper Miining Inc
• To: DRMS
• Annual Report Year: 2010
• Permit Index Doc Type: Hydrology Report
• Email Name: RDZ
• Media Type: D
• Archive: No

2.5 2009 Hydrological Data
Hydro-Engineering Inc.'s collation of the 2010 hydrological data for Trapper Mine is submitted as Section
2.5, following this discussion, and addresses:
a. Groundwater ............................................................................ Sections 2.0-3.6
(1) Groundwater level figures and tables ............................ Appendix A
(2) Groundwater quality figures and tables ........................ Appendix B
(3) Piezometric surface maps for the major aquifers........... Maps 2-1 thru 2-3
(4) Springs data ................................................................... Appendix B
b. Surface water .......................................................................... Sections 4.0-5.3
(1) Surface-water quality figures and tables ........................ Appendix C
(2) Flow measurement figures ............................................. Appendix C
(3) Flow vs TSS vs time figures ........................................... Appendix C
(4) Conductivity vs flow vs time figures ............................... Appendix C
c. Observed impacts on the hydrologic systems ......................... Section 6.0
Included with the 2010 Hydrology Report is an index sheet to keep the basic well data and aquifer
information available to the reader. This index is to be used as the reference and also a "bookmark" as
the section is reviewed.
2.6 Trends
Hydro-Engineering's Section 6.0 discusses the observed impacts on the hydrologic systems of Trapper
• Mine. Six surface water monitoring sites experienced discharge during 2010. Peak flows occurred in the
early spring in association with snowmelt runoff. Average snow-pack during the winter of 2009-2010
came off slowly and evenly resulting in a mellow spring melt. Hydro-Engineering's Section 6.0 discussion
provides details concerning 2010 trends. Overall, Trapper continues to have little effect on the local
hydrologic regime.
2.7 Spoil Spring Sampling (2010)
Trapper conducted spoil spring sampling throughout the permit area during 2010. Data from this
monitoring is presented in the 2010 Annual Hydrology Report Appendix B Table B-2. Spring and Seep
locations are shown on Map M52 in the mine permit. Only those springs with flows exceeding 5 gpm are
sampled for full suite analysis in accordance with the approved monitoring program.
2.8 WET Testing Results
In 2010, two NPDES outfalls had Acute WET tests performed as required by NPDES Permit CO-0032115
- sites 011 and 020. In all cases the discharges showed no acute toxicity to the test species. Summaries
for the tests conducted during 2010 are included in Appendix C of Section 2.5. In accordance with our
NPDES permit only those drainages that receive pit dewatering or spoil spring contributions are required
to undergo WET testing.
GCR 2/11
M:WNNUALRP\DRMS10RPTWNNUAL HYDROLOGY RPTS
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