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• Since the drainages are no longer involved with active mining, the quarterly and semi-annual sampling <br />requirements should no longer be needed. Table 4.8-11 a was revised to reflect this also. <br />2.5 1994 Hydrological Data <br />Hydro-Engineering Inc.'s collation of the 1994 hydrological data for Trapper Mine is submitted as Seo- <br />lion 2.5, addressing: <br />a. Groundwater Sections 2.0-3.6 <br />(1) Static water level graphs Appendix A <br />(2) Salinity graphs Appendix B <br />(3) Piezometric surface maps for the major aquifers Maps 2.1-2.3 <br />(4) Water quality Appendix B <br />b. Surface water Sections 4.0-5.3 <br />(1) Water quality figures and tables Appendix C <br />(2) Flow charts Appendix C <br />(3) Flow vs TSS vs time Appendix C <br />(4) Conductivity vs flow vs time Appendix C <br />Included with the 1994 Hydrology Report is an index sheet (blue) to keep the basic well data and <br />aquifer information available to the reader. This index is to be used as the reference and also a <br />"bookmark" as 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. In general, ground water levels and surface water flows were lower than those observed in 1993. <br />The low precipitation level (83 percent of the historical mean) was the major contributor. Trapper con- <br />tinues to have little if any effect on the local hydrologic regime. <br />2.7 Spoil Spring Sampling (1994) <br />Trapper wnducted the annual spoil spring inventory, required by Section 4.8.5.2a, across our mined <br />areas. No new spoil springs were located and none of the existing spoil springs exceeded the five <br />gallon per minute flow criteria. <br />2.8 1994 WET Testing Results <br />In 1994, four drainages had Acute WET tests pertormed as required by NPDES Permit CO-0032115. <br />NPDES sites 001, 002, 006 and 013. In all cases, the discharge showed no acute toxicity to the test <br />species. Summaries for the tests are enclosed. <br />In accordance with our NPDES permit, only those drainages that may receive pit dewatertng are <br />required for WET testing. Permit Table 4.8-12a, footnote (2) is revised to list those drainages requiring <br />WET testing. <br />• <br />LW Wjsb ONS <br />[DMGWdREPf~ <br />Tk-E6 i~3~~96 <br />