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Gulch, East Flume and West Horse Gulch drainages are Trapper's NPDES discharge sites 001, 002, <br />008, 009, 011, 017, 018, 019, 020, 021, 022, 023 and 024, respectively. Sites that had flowing water <br />and were sampled during 2015 are Johnson, No Name, East Pyeatt and Middle Flume. <br />Some of the data could allow alternative interpretations and some of those interpretations <br />may indicate hydrologic impacts that are significantly different from those presented in this report. <br />1.1 GROUND -WATER SETTING FOR PERMIT EXTENSION AREA <br />The geologic setting is the same for the permit extension area as that presented in the <br />Trapper Permit. Figure 2.7-4 in the Trapper Permit presents the structure of the basin in the area <br />of the mine. Structure of the coal seams has been extended to cover the permit extension area. <br />These structure maps show that the typical dip to the north in the northeastern portion of the <br />Trapper permit area is changing to the northwest in Section 28 T6N R90W. This change fits the <br />regional structure change that is shown in Figure 2.7-4 <br />1.2 GROUND -WATER CONDITIONS FOR PERMIT EXTENSION AREA <br />The structure maps for I and R coal seams were used to aid in the extrapolation of the <br />water -level elevations for the M and QR aquifers in the permit extension area. The structure map <br />for the H seam was used in the extension of the water -level elevations for the Third White Sandstone <br />because the base of this sandstone is near the top of the H coal. <br />The water -level elevations in the QR aquifer were extended in the permit extension area <br />accounting for the change in the dip of these beds from the north to the northwest. This structure <br />change causes the water level contours to curve to the northeast in the permit extension area resulting <br />in ground -water flow to the northwest instead of the northerly flow that occurs to the west of this <br />area. Similar changes in the flow directions in both the HI and Third White Sandstone aquifers also <br />occur in the permit extension area and to the north of the extension area. <br />Trapper Mining Company 1-3 <br />2015 Annual Report <br />