2013-03-14_REPORT - C1981010 ‎(7)‎

• Permit No: C1981010
• IBM Index Class Name: REPORT
• Doc Date: 3/14/2013
• Doc Name: 2012 Annual Hydrology Report
• From: Trapper Mining, Inc
• To: DRMS
• Annual Report Year: 2012
• Permit Index Doc Type: Hydrology Report
• Email Name: JLE
• Email Name: SB1
• Media Type: D
• Archive: No

2.5 2011 Hydrological Data
Hydro- Engineering Inc.'s collation of the 2012 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.
2.6 Trends
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 2012 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.
Hydro- Engineering's Section 6.0 discusses the observed impacts on the hydrologic systems of Trapper
Mine. Eleven surface water monitoring sites experienced discharge during 2012. Peak flows occurred at
most sites in early to mid - March. Snowmelt came quickly during the month of March, despite a below
average snow -pack for the winter, water readily ran off during warm temps and a significant late April,
early March snowstorm. Hydro- Engineering's Section 6.0 discussion provides details concerning 2012
trends. Overall, Trapper continues to have little effect on the local hydrologic regime.
2.7 Spoil Spring Sampling (2011)
Trapper conducted spoil spring sampling throughout the permit area during 2012. Data from this
monitoring is presented in the 2012 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 2012, three NPDES outfalls had Acute WET tests performed as required by NPDES Permit CO-
0032115 - sites 011, 020 and 021. In all cases the discharges showed no acute toxicity to the test
species. Summaries for the tests conducted during 2012 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 3/13
M ANNUALRP \DRMS12RPT\ANNUAL HYDROLOGY RPTS