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• 2.5 1999 Hydrological Data <br /> Hydro-Engineering Inc.'s collation of the 1999 hydrological data for Trapper Mine is submitted as Section <br /> 2.5,following this discussion, and addresses: <br /> a. Groundwater............................................................................Sections 2.0-3.7 <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 and Seeps data..................................................Appendix B <br /> b. Surface 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 1999 Hydrology Report is a blue 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. In general,ground water levels began to show decreasing trends in response to the relatively lower <br /> recorded precipitation amounts measured the past two years. Surface water discharge peak flows were <br /> also recorded at levels lower than average with the peak values associated with snowmelt in April. <br /> Previously noted conductivity increases in Johnson Gulch and East Pyeatt Gulch surface water discharges <br /> continue to be expressed. Likewise, the conductivity increase previously noted at well P-8, a 3n° White <br /> Sandstone well situated downgradient of A pit mining in the Johnson drainage remains evident although <br /> levels did decline somewhat during 1999. Hydro-Engneering's Section 6.0 discussion provides more <br /> details concerning these observations and trends. Overall, Trapper continues to have little effect on the <br /> local hydrologic regime. <br /> 2.7 Spoil Spring Sampling(1999) <br /> Trapper conducted spoil spring sampling throughout the permit area during 1999. Data from this <br /> monitoring is presented in the 1999 Annual Hydrology Report Appendix B Table B-2. Spring and Seep <br /> locations are shown on the Annual Hydrologic Report Map 2 (Sheets 1, 2, and 3) of this report. Several <br /> springs were sampled for full suite analyses in 1999. Typically, in future years, only those springs with <br /> flows exceeding 5 gpm will be sampled in accordance with the approved monitoring program. Some sites, <br /> such as Fox Den in 1999, may be sampled more frequently to provide additional baseline quality. <br /> 2.8 WET Testing Results <br /> In 1999, Three NPDES outfalls had Acute WET tests performed as required by NPDES Permit CO- <br /> 0032115 - sites 001, 002, and 011. In all cases the discharges showed no acute toxicity to the test <br /> species. Summaries for the tests conducted during 1999 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 /> rcxwx sw <br /> KUNNUALRNMAOB FrOOREPTIDOC <br />