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2.5 2016 Hydrological Data <br />Hydro -Engineering Inc.'s collation of the 2016 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 2016 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. Five surface water monitoring sites experienced discharge during 2016. Peak flows occurred at <br />most sites in early March. Snowmelt was gradual during the months of February and March. Hydro - <br />Engineering's Section 6.0 discussion provides details concerning 2016 trends. Overall, Trapper continues <br />to have little effect on the local hydrologic regime. <br />2.7 Spoil Spring Sampling (2016) <br />Trapper conducted spoil spring sampling throughout the permit area during 2016. Data from this <br />monitoring is presented in the 2016 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 2016, one NPDES outfall had Acute WET tests performed as required by NPDES Permit CO -0032115 <br />at site 011. In all cases the discharges showed no acute toxicity to the test species. Summaries for the <br />tests conducted during 2016 are attached to this discussion. In accordance with our NPDES permit only <br />those drainages that receive pit dewatering or spoil spring contributions are required to undergo WET <br />testing. <br />GCR 2/17 <br />M WNNUALRRDRMSI6RPTWNNUAL HYDROLOGY RPTS <br />