2007-03-16_REPORT - C1981010 (9)

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the last nine years for well P -8 shows fairly steady concentrations after a large increase over the previous three years to a value of approximately 4000 mg/l. The increase in well P -8 is above the levels expected for the 3rd White Sandstone and is likely due to the upgradient mining based on the timing and magnitude of the increase. However, some of this higher level could be natural based on natural large concentrations observed in 2nd White Sandstone well P -5. Concentrations are expected to decline in the future if the increase is due to upgradient mining. Figure B -7 presents TDS values for 2nd White Sandstone well P -5 and shows that the concentration were in the 2500 to 3000 mg/1 range prior to mining in this area. Water quality for this well has not been collected due to it being dry or nearly dry. Natural water - quality concentrations in the 1st, 2nd and 3rd White Sandstones are expected to vary over a similar range. Figure B -7 also presents 2nd and 3rd White Sandstone well GE -3 and 1st White Sandstone well GLUX -1, which consists of low TDS water. Figure B -8 presents the TDS concentrations versus time for alluvial wells GC -3, P -1, J -1 and COY. Lewis Shale well P -3 is also included in this plot due to its response to the Pyeatt alluvial system but was dry in 2006. TDS concentrations in Pyeatt alluvial well P -1 had been overall steady the last few years but declined in 2006. These variations are within the historical natural range. The alluvial ground water in Johnson Gulch had shown an increasing trend in TDS since 1996 with the values from the last few years fairly steady. The recent Johnson Gulch alluvial ground water is still within the natural range for TDS in this aquifer. These TDS values and variations are very similar to the natural values and variations observed in Flume Gulch alluvial well, COY. Trapper Mining Company 3-4 2006 Annual Report