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2.5 2008 Hydrological Data <br />Hydro-Engineering Inc.'s collation of the 2008 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 2008 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 />is Mine. Eight surface water monitoring sites experienced discharge during 2008. Peak flows occurred in <br />the late winter and spring in association with snowmelt runoff. Above average snow-pack during the <br />winter of 2007-2008 came off slowly and evenly resulting in a mellow spring melt. Hydro-Engineering's <br />Section 6.0 discussion provides details concerning 2008 trends. Overall, Trapper continues to have little <br />effect on the local hydrologic regime as noted by OSM in their Phase III Bond Release inspection <br />narrative. <br />2.7 Spoil Spring Sampling (2008) <br />Trapper conducted spoil spring sampling throughout the permit area during 2008. Data from this <br />monitoring is presented in the 2008 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 2008, 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 2008 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 3108 <br />M:IANNUALRPI0RMS07RPTVINNUALHYDROLOGYRPTS