2014-03-18_REPORT - C1981010 ‎(5)‎

• Permit No: C1981010
• IBM Index Class Name: Report
• Doc Date: 3/18/2014
• From: Trapper Mining, Inc
• To: DRMS
• Annual Report Year: 2013
• 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 2013 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 ................... ...............................
(1) Surface -water quality figures and tables
(2) Flow measurement figures .....................
(3) Flow vs TSS vs time figures ...................
(4) Conductivity vs flow vs time figures .......
c. Observed impacts on the hydrologic systems
.................. Sections 4.0 -5.3
.................. Appendix C
..................Appendix C
..................Appendix C
.................. Appendix C
.................. Section 6.0
Included with the 2013 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 2013. Peak flows occurred at
most sites in early April. Snowmelt was gradual during the month of March. A second late summer peak
occurred in late September when the site experienced significant rains. Hydro- Engineering's Section 6.0
discussion provides details concerning 2013 trends. Overall, Trapper continues to have little effect on the
local hydrologic regime.
2.7 Spoil Spring Sampling (2013)
Trapper conducted spoil spring sampling throughout the permit area during 2013. Data from this
monitoring is presented in the 2013 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 2013, one NPDES outfalls had Acute WET tests performed as required by NPDES Permit CO- 0032115
at site 011. In all cases the discharges showed no acute toxicity to the test species. Summaries for the
tests conducted during 2013 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 3/14
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