1999-03-15_PERMIT FILE - C1981010 ‎(3)‎

• Permit No: C1981010
• IBM Index Class Name: Permit File
• Doc Date: 3/15/1999
• Doc Name: Annual Hydrology Report
• Annual Report Year: 1998
• Section_Exhibit Name: Appendix W 1998 Report Section 2.0
• Media Type: D
• Archive: No

2.4 Monitoring Points
Rather than submitting an additional map series, please refer to current Permit No. C-81-010, Map M52,
for locations of all the operational hydrologic monitoring points. No new ground water monitoring wells
were installed during the 1998.
NPDES discharge point 020 (Middle Flume Gulch) was completed during November of 1998. This pond
did not discharge during the year.
No new pit dewatering wells were installed during 1998.
2.5 1998 Hydrological Data
Hydro-Engineering Inc.'s collation of the 1998 hydrological data for Trapper Mine is submitted as Section
2.5, following this discussion, and addresses:
a. Groundwater.........................................................................Sections 2.0-3.7
(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 and Seeps data ...............................................Appendix B
b. Surface water........................................................................Sections 4.0-5.3
(1) 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 1998 Hydrology Report is a tan 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. In general, ground water levels continued to show increasing trends due to the higher than normal
precipitation patter prevailing for the past four years. Surface water discharge peak flows were also
recorded at levels higher than average with many of the peak values associated with the snowmen event
occurring in late March. Conductivity increases in Johnson Gulch and East Pyeatt Gulch surface water
discharges have been noted. likewise, a conductivity increase is noted at well P-8, a 31 White
Sandstone well situated downgradient of A pit mining in the Johnson drainage. Hydro-Engneering's
Section 6.0 discussion provides more details conceming these observations and trends. Overall, Trapper
continues to have little effect on the local hydrologic regime.
2.7 Spoil Spring Sampling(1998)
Trapper conducted spoil spring sampling throughout the permit area during 1998. Data from this
• monitoring is presented in the 1998 Annual Hydrology Report Appendix B Table B-2. Spring and Seep
locations are shown on the Annual Hydrologic Report Map 2 (Sheets 1, 2, and 3) of this report. Several
springs were sampled for full suite analyses in 1998. Typically, in future years, only those springs with
flows exceeding 5 gpm will be sampled in accordance with the approved monitoring program. Some
sites, such as Fox Den in 1998, may be sampled more frequently to provide additional baseline quality.