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2.5 2003 Hydrological Data <br />Hydro-Engineering Inc.'s collation of the 2003 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. 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 2003 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. Only five surface water monitoring sites experienced discharge during 2003. Peak flows occurred <br />in the spring in association with snowmelt runoff. Hydro-Engineering's Section 6.0 discussion provides <br />details concerning 2003 trends. Overall, Trapper continues to have little effect on the local hydrologic <br />regime as noted by OSM in their Phase III Bond Release inspection narrative. <br />2.7 Spoil Spring Sampling (2003) <br />Trapper conducted spoil spring sampling throughout the permit area during 2003. Data from this <br />monitoring is presented in the 2003 Annual Hydrology Report Appendix 8 Table B-2. Spring and Seep <br />locations are shown on Map M52. Only those springs with flows exceeding 5 gpm are sampled for full <br />suite analysis in accordance with the approved monitoring program. <br />2.8 WET Testing Results <br />In 2003, five NPDES ouffalls had Acute W ET tests performed as required by NPDES Permit CO-0032115 <br />-sites 001, 002, 011, 020 and 021. In all cases the discharges showed no acute toxicity to the test <br />species. Summaries for the tests conducted during 2003 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 W ET testing. <br />FMS 3106 <br />M:WINUALRP~DMG03RP7WlNUALNYDROLOGYRPTS <br /> <br />