PERMFILE64870

• Permit No: C1981010
• IBM Index Class Name: Permit File
• Doc Date: 4/13/1998
• Doc Name: Annual Hydrology Report
• Section_Exhibit Name: Appendix W 1997 Report Section 2.0
• Media Type: D
• Archive: No

~ 2.5 1897 Hydrological Data
~ Hydro-E Int.'s c~oNation of the 1997 h
ngineerirp ydr+obgical data for Trapper Mine is subm8ted as Section
2.5, addressing:
a. Groundwater .........................................................................Sections 2.0-3.6
(1) Static water level graphs ...............................................Appendix A
(2) SaNnBy graphs .............................................................Appendoc B
(3) Piezorrretric surface maps for the major aquifers...........Maps 2.1-2.3
(4) Water quality ................................................................Appendix B
b. Surtace water ........................................................................Sections 4.0-5.3
(1) Water qual9y Mures and tables ....................................Appendbc C
(2) Flow c~arta ...................................................................App~dbc C
(3) Flow ws TSS vs tirrre .................................................... C
(4) Conductivity ~ flan vs time .....................................:....Appendix C
Inched with the 1997 Hydrobgy Report is a tan 1o keep basic data and aquifer
information ava9at>>e to the reader. This ~ tit ba ueed sa tl~s rice and a "bootu~lrerk" as
the section is reviewed.
2.6 Tends
Hydro-Engineering's Section 8.0 discusses the observed facts on the h~ systems of Trapp
Mine. In general, ground water levels and surface water flows were him a due to ~e
~' higher than normal prec~p8ation for the year. Trapper corrt~ues to have Nltte ei~ct ~ ttre local hydro-
~, logic reg~rre.
Y.7 8poi18pring 8aanplMg (1997)
Trapper conducted a spoil spring urventory across the rn~e s8e during 1997. Data from ttris ~ventorR ie
presented in the 1997 Annual Hydroioyy Report Appendbc 8 Table 8-2. Sprirp and Seep bcatians are
shown on the Annual Hydrologic Report MeR 2 (SMeets 1, 2, and 3y of this Severs wane
sampled for fua su8e an~yses in 1997 for ~e of establistdng some baseline iradon. to
1998 and beyond, only those springs wRh lbws exceeding 5 gpm waN be sampled in acxrordar~r wi9r the
approved monitoring program.
2.8 WET Testing Results
In 1997, six NPDES outfags had Acute WET tests pertoRned as requ~+ed by NPDES Pem~t CO-0032115.
NPDES saes 001, 002, 011, 013, 015, and 017. In aN but one case the discharges showed no acute
to~daty to the test species. A WET test fa~rre did occur for C. dubia ~ outfs~ 011 (East Pyeatt drainage)
during the fourth quarter of 1997. Accelerated testing compietecl during the first quarter of 1998 !ltowec~,
the documented toxicity was not persistent. Summaries for the tests conducted during 1997 are
in Append'oc C of Section 2.5. In accordance withh our NPDES permit, ony those draa~ages that receive
pit dewatering or spoil spring contributions are required to underno WET test~g.
KCKJkdc 3198
\ / M:V1PNrUALRPIOAA(3D7RP7~7REPT'2.DOC