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2.5 2004 Hydrological Data <br />Hydro-Engineering Inc.'s collation of the 2004 hydrological data for Trapper Mine is submitted as Section <br />2.5, following this discussion, and addresses: <br />a. Groundwater .................................................................... .....Sedions2.0.3.6 <br />(1) Groundwater level figures and tables ....................... .....Appendix A <br />(2) Groundwater quality figures and tables ................... .....Appendix B <br />(3) Piezometric surface 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 2004 Hydrology Report is an index sheet to keep the basic well 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-Engineedng's Section 6.0 discusses the observed impacts on the hydrologic systems of Trapper <br />Mine. Six surface water monitoring sites experienced discharge during 2004. Peak flows occurred in the <br />spring in association with snowmek runoff. Hydro-Engineering's Section 6.0 discussion provides details <br />cenceming 2004 trends. Overall, Trapper continues to have little effect on the local hydrologic regime as <br />noted by OSM in their Phase III Bond Release inspection narrative. <br />2.7 Spoil Spring Sampling (2004) <br />Trapper conducted spoil spring sampling throughout the permit area during 2004. Data from this <br />monitoring is presented in the 2004 Annual Hydrology Report Appendix B Table B-2. Spring and Seep <br />locations are shown on Map M52 in the mine permit. Only those springs with flows exceeding 5 gpm are <br />sampled for full suite analysis in accerdance with the approved monitoring program. <br />2.8 WET Testing Results <br />In 2004, six NPDES outfalls had Acute WET tests pertonned as required by NPDES Permit CO-0032115 <br />- sftes 001, 002, 011, 020, 021 and 023. In all cases the discharges showed no acute toxicity to the test <br />speaes. Summaries for the tests conducted during 2004 are included in Appendix C of Section 2.5. In <br />accordance with our NPDES permit only those drainages that receive pit dewatering or spoil spring <br />contributions are required to undergo WET testing. <br />FMS 3N5 <br />M:UNNUAlF2P10MGMRPMNNUAtHYDROLOGVRPTS <br /> <br />