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2.5 2007 Hydrological Data <br />Hydro-Engineering Inc.'s collation of the 2007 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 surface maps for the major aquifers.......... Maps 2-1 thru 2-3 <br />(4) Springs data .................................................................Appendix B <br />b. Surface water ........................................................................Sections 4.0-5.3 <br />(1) Surface-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 2007 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-Engineering's Section 6.0 discusses the observed impacts on the hydrologic systems of Trapper <br />Mine. Seven surface water monitoring sites experienced discharge during 2007. Peak flows occurred in <br />the late winter and spring in association with snowmelt runoff and unseasonably warm precipitation <br />events. Above average flows were also recorded during a near 100 year storm event in mid September. <br />Hydro-Engineering's Section 6.0 discussion provides details concerning 2007 trends. Overall, Trapper <br />continues to have little effect on the local hydrologic regime as noted by OSM in their Phase III Bond <br />Release inspection narrative. <br />2.7 Spoil Spring Sampling (2007) <br />Trapper conducted spoil spring sampling throughout the permit area during 2007. Data from this <br />monitoring is presented in the 2007 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 accordance with the approved monitoring program. <br />2.8 WET Testing Results <br />In 2007, three NPDES outfalls had Acute WET tests performed as required by NPDES Permit CO- <br />0032115 -sites 011, 020 and 021. In all cases the discharges showed no acute toxicity to the test <br />species. Summaries for the tests conducted during 2007 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 />GCR 3/08 <br />. M:IANNUALRPIDRMS07RPTWNNUALHYDROLOGYRPTS <br />