PERMFILE101682

• Permit No: C1981010
• IBM Index Class Name: Permit File
• Doc Date: 4/4/1997
• Doc Name: Annual Hydrology Report
• Section_Exhibit Name: Appendix W 1996 Report Section 2.0
• Media Type: D
• Archive: No

2.5 1896 Hydrological Data
Hydro-Engineering Inc.'s collation of the 1996 hydrological data far Trapper Mine is submitted as Section
2.5, addressing:
a. Groundwater .........................................................................Sedions2.0-3.6
(1) Static water level graphs ..............................................Appendix A
(2) Salinity graphs .............................................................Appendix B
(3) Piezometrtc surface maps for the major aquifers..........Maps 2.1-2.3
(4) Water quality ................................................................Appendix B
b. Surface water ...................................................... ..................Sections 4.0-5.3
(1) Water quality figures and tables ................. ..................Appendix C
(2) Flow charts ................................................. ..................Appendix C
(3j Flow vs TSS vs time .................................. ..................Appendix C
(4) Conductivity vs flow vs time ....................... ..................Appendix C
Included with the 1998 Hydrology Report is a blue 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 Sedion 6.0 discusses the observed impacts on the hydrologic systems of Trapper
Mine. In general, ground water levels and surface water flows were higher than average due to the
higher than normal precipitation for the year. Trapper continues to have little effect on the local hydro-
logic regime.
2.7 Spoil Spring Sampling (1996)
Trapper conducted the annual spoil spring inventory, required by Sedion 4.8.5.2a, across the mined
areas. No new spoil springs were located. One spoil spring, the Johnson Gulch spring, exceeded the
five gallon per minute flow criteria. Table 1-2 presents the sample results.
Table 1-2 also shows the springs and seeps that are located within the western portion of the mine plan
and permit area. A history of the springs is also included. Attached map M52 illustrates the location of
these springs. The Eest Pyeatt spring, A haul road seep, Coyote spring and the West Buzzard spring ere
not considered as "spoil" spdngs due to their location in relation to the mining activities.
Beginning in 1997, a spring inventory will be wnduded with the annual spoil spring survey. The goal is
to identify springs outside the current mining area, but within the permit area. Possible impacts of future
mining activities will then be evaluated. Map M52 has been revised to show known spring and seep
locations.
Sedion 8.0 of the Annual Report details the spring inventory and monitoring plan for further inclusion
within Trapper's Mining and Reclamation Permit.
2.8 WET Testing Results
_~ In 1998, seven drainages hed Acute WET tests performed as required by NPDES Pertnft CO-0032115.
NPDES sites 001, 002, 005, 009, 011, 013, and 015. In all cases the discharge showed no acute toxicity
to the test species. Summaries for the tests are enclosed. In accordance wRh our NPDES permit, only
those drainages that may receive pfl dewatering are required for WET test(ng.