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John Hamrick January 16, 2001 Page 5 water was able to flow into the formation. If the Pack Rat Spring was impacted by this mine water, the following would be expected: 1. Analytes with lower concentrations in the Pack Rat Spring water than Pack Rat Mine water would be expected to increase. 2. Analytes with higher concentrations in the Pack Rat Spring water than Pack Rat Mine water would be expected to decrease. The concentrations of sulfate and calcium are significantly lower in the Pack Rat Mine water then in the Pack Rat Spring water sampled in 1980 (Figure 3). If the water from the mine and water from the spring were to have commingled the concentration of these analytes in the Pack Rat Spring would be expected to decrease. Table 3 shows an increase in concentration, 109 mg/1 to 162 mg/1 for sulfate and 23.6 mg/1 to 36.5 mg/l. This strongly indicates that Pack Rat Mine water is not impacting The Pack Rat Spring. Comparison of Trace Metal Concentrations in the Packrat Spring and Seasonal Flow Rates The Pack Rat Mine now acts as a sump, thus controlling the rate of flow of mine water into the formation. This flow can be expected to be constant and not affected by seasonal fluctuations. The Pack Rat Spring, however, does show seasonal fluctuations in flow rate (Figure 6). If the mine were supplying water to the Pack Rat Spring, concentrations of these metals would be expected to decrease with an increase in the flow rate of the spring. Analysis of the Pack Rat Portal discharge water shows that it contained significantly greater concentrations of Arsenic and Total Ra-226 (Table 3) than the Pack Rat Spring. If the mine were supplying water to the Pack Rat Spring, concentrations of these metals would be expected ,to decrease with an increase in the flow rate of the spring. Figure 6 indicates that Arsenic remained constant throughout the two-year sampling period. Total Ra-226 actually increased with an increase in flow from the spring. Concentrations of natural uranium are higher in the Pack Rat Spring water, therefore the concentrafions would be expected to increase with a seasonal increase in flow from the spring. Figure 6 shows that the concentrations of natural uranium remained relatively constant over the sampling period and showed do not show the expected response to seasonal fluctuations in spring flow. The above described changes in analyte concentrations over time further support the conclusion that the Pack Spring is not influenced by nor connected to the Pack Rat/Hubbard mine workings. n U