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2.5 1988 Hvdroloaical Data <br />Enclosed is Hydro-Engineering Inc.'s collation of the 1988 hydrological data for Trapper Mine. The report <br />addresses: <br />a. Ground Water Section 2.0 <br />(1) Static water level graphs. Appendix A <br />(2) Salinity graphs. Appendix B <br />(3) Piezometric surface maps Maps 2.1-2.3 <br />for the major aquifers. <br />(4) Water quality tables. Appendix B, Table B1 <br />(5) 1987 and 1988 pump tests. Appendix D <br />b. Surface Water Section 4.0 <br />(1) Water quality tables. Appendix C Table Ci <br />(2) Flow charts. Appendix C Figures C1-C6 <br />(3) Flow vs TSS vs time graphs. Appendix C Figures C7-C18 <br />(4) TDS vs flow vs time graphs. Appendix C Figures C19-C30 <br />2.6 Tren s <br />The trends for impacts on the hydrologic systems at Trapper Mine are presented in Section 2.6 of Hydro <br />Engineering's report. <br />Basically for the groundwater regime, the natural variations in aquifer recharge account for most of the <br />changes In Trapper monitoring wells. Wells in close proximity to mining do show some impacts but they <br />are similar to the natural variations. <br />Specifically upgradient mining, close to monitoring wells in undisturbed areas, has affected their <br />piezometric water levels but not to the detriment to the ground water system. The increased permeability <br />of the backfilled areas has both increased and/or decreased pre-mine water levels depending on their <br />location. Wells installed in the backfilled areas will probably never recover to undisturbd conditions but that <br />same permeability will increase water levels and potential yields in down gradient wells and aquifers. <br />Water quality parameters are also more affected by natural recharge than mining. The TDS levels in the <br />backfill wells are similar to the native aquifers. There have been some TDS level increases but generally not <br />out of the natural range nor that pose risks. All pH values are within natural and acceptable ranges. <br />More information on Radium levels is needed. Most baseline levels are acceptable but outliers at various <br />sites without direct correlation to specific aquifers or sampling periods require more study. Trapper has <br />initiated OA/QC sampling splits to verity lab analytical results and is working with Hydro Engineering to <br />evaluate the variations in Radium concentrations. <br />For the surface water regime, Trappers sedimentation systems are working. There were no violations or <br />excursions for effluents discharged in 1988. <br /> <br />