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2.5 2002 Hydrological Data <br />Hydro-Engineering Inc.'s collation of the 2002 hydrological data for Trapper Mine is submitted as Section <br />2.5, following this discussion, and addresses: <br />a. Groundwater ............................................................................ Sections 2.0-3.6 <br />(1) Groundwater level figures and tables ............................. Appendix A <br />(2) Groundwater quality figures and tables .........................Appendix B <br />(3) Piezometric Surtace maps for the major aquifers........... Maps 2-1 thru 2-3 <br />(4) Springs data ....................................................................Appendix B <br />b. Surtace water .............................................................. ............. Sections 4.0-5.3 <br />(1) Water quality figures and tables ......................... ............Appendix C <br />(2) Flow measurement figures ................................. ............Appendix C <br />(3) Flow vs TSS vs time figures ............................... ............Appendix C <br />(4) Conductivity vs flow vs time figures ................... .............Appendix C <br />c. Observed impacts on the hydrologic systems ............. ............ Section 6.0 <br />Included with the 2002 Hydrology Report is an index sheet to keep the basic weB data and aquifer <br />information available to the reader. This index is to be used as the reference and also a "bookmark" as <br />the section is reviewed. <br />2.6 Trends <br />Hydro-Engineering's Section 6.0 discusses the observed impacts on the hydrologic systems of Trapper <br />Mine. In general, ground water levels continued to show decreasing trends in response to the relatively <br />lower recorded precipitation amounts measured the past three years. Surface water discharge peak flows <br />were also recorded at levels lower than average. Only five Surtace water monitoring sites experienced <br />discharge during 2002. Peak flows occurred in the spring in association with snowmelt runoff. Hydro- <br />Engineering's Section 6.0 discussion provides details concerning 2002 trends. Overall, Trapper continues <br />to have little effect on the local hydrologic regime. <br />2,7 Spoll Spring Sampling (2002) <br />Trapper conducted spoil spring sampling throughout the permit area during 2002. Data from this <br />monitoring is presented in the 2002 Annual Hydrology Report Appendix B Table B-2. Spring and Seep <br />locations are shown on the Annual Hydrologic Report Map 2 (Sheets 1, 2, and 3) of this report. Only a <br />handful of springs exceeded the 5 gpm sampling threshold during 2002. Only those springs with flows <br />exceeding 5 gpm are sampled for full suite analysis in accordance with the approved monitoring program. <br />2,8 WET Testing Results <br />In 2002, four NPDES outfalls had Acute WET tests performed as required by NPDES Permit CO-0032115 <br />-sites 001, 002, 011 and 021. In all cases the discharges showed no acute toxicity to the test species. <br />Summaries for the tests conducted during 2002 are included in Appendix C of Section 2.5. In accordance <br />with our NPDES permit only those drainages that receive pit dewatering or spoil spring contributions are <br />required to undergo WET testing. <br />FMS/frm Y01 <br />M:4wNLALRNOMC99RP7102REFT1.00C <br />