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2.5 2019 Hydrological Data <br /> Hydro-Engineering Inc.'s collation of the 2018 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 2019 Hydrology Report is an index sheet to keep the basic well data and aquifer <br /> information available to the reader. This index may be used as a reference and also a"bookmark"as the <br /> 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. Four surface water monitoring sites experienced discharge during 2019. Peak flows occurred at <br /> most sites in early April. Snowmelt was gradual during the spring months with despite a slightly above <br /> average snowpack for the winter. The summer months of July, August and September were well below <br /> average for rainfall. Above average precipitation fell in June providing for an increase in runoff at some <br /> outfalls. Hydro-Engineering's Section 6.0 discussion provides details concerning 2019 trends. Overall, <br /> Trapper continues to have little effect on the local hydrologic regime. <br /> 2.7 Spring Sampling (2019) <br /> Trapper conducted spring sampling throughout the permit area during 2019. Data from this monitoring is <br /> presented in the 2019 Annual Hydrology Report Appendix B Table B-2. Spring and Seep locations are <br /> shown on Map M52 in the mine permit. Only those springs with flows exceeding 5 gpm are sampled for <br /> full suite analysis in accordance with the approved monitoring program. <br /> 2.8 WET Testing Results <br /> In 2019, no NPDES outfall had Acute WET tests performed as required by NPDES Permit CO-0032115. <br /> In accordance with our NPDES permit only those drainages that receive pit dewatering or spoil spring <br /> contributions are required to undergo WET testing. Pit de-watering discharges did not pass through any <br /> active outfall and all potential spoil springs on the site have been bond released and no longer require <br /> monitoring. <br /> GCR 3/20 <br /> M•\ANNUALRP\DRMSI9RPTWNNUAL HYDROLOGY RPTS <br />