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Forest Luke Trapper Mining Inc. October 6, 1998 Page 2 Table 1-Hydrologic monitoring data missing from 1997 annual report Sample site Missing parameter Outfall 013 Metals on list A-3 in second half of yeaz Outfalls 015 and Metals on list 017 A-3 not reported for only discharge (9/22/97) Wells GB-1, GB2, Fall water level GB-5 Wells GF-4, GF-5, Chromium and and GF-7 radium All GC, GD, GE, PO, and NO, and GF wells Surface water -Compliance with NPDES limits. Trapper's dischazges exceeded the mine's NPDES limitations on six days in 1997. None of the exceedances constituted a violation of an effluent limitation, however, because each exceedance qualified for a storm exemption. Trapper's dischazges were also in compliance with receiving stream standazds set by the Colorado Water Quality Control Commission. Surface water -Impacts from mining 4. TDS discussion: Pre-mining vs. post-mining, page 6-6, 2nd paragraph. The third sentence in this pazagraph says: "The TDS of the surface water from the mine azea is similaz to the TDS from the non-mined azea, therefore, an increase has not been defined." Assuming this statement refers to the non-mined S-1 site and the mined NPDES 001 and 002 sites, is the conclusion still valid given that flows at S-1 have greatly declined over the yeazs, while flows at NPDES 001 and 002 have shown little change? Could it be that the TDS increase at S-1 was caused simply by diminishing flows, while the TDS increases at 001 and 002 aze caused by a local influx of dissolved solids? 5. Long-term TDS trend in No Name Gulch. The attached Figure 1 shows that TDS levels in No Name Gulch have generally increased since the mid-1980s. From late 1984 through 1997, TDS levels above 2000 mg/I have became more prevalent while levels below 1500 mg/l have become less common. At least part of this increase may have been