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downgradient and outside the proposed mining disturbance. As such, these wells would <br />be expected to show any changes resulting from the mining disturbance. <br />Each of the wells was sampled twice during the 1998 water year. Sampling occurred <br />during the second quarter (January 13-14), and third quarter (June 1). Additionally, well <br />95-1 was monitored during the fast quarter of the 1998 water yeaz (October 14, 1997). <br />With one exception, the depth to water for the wells has remained consistent during the <br />1998 water yeaz. The depth to water increased from 22 to 64 feet in well 94-1 during the <br />last quarter of the 1997 water year. Depth to water remained at 64.0 feet during the <br />second quarter of water yeaz 1998, and then returned to the historic depth of 22 feet. This <br />depth was also observed during the first quarter of the 1999 water yeaz. Water <br />temperature in the wells fluctuates regularly with the seasons. Water temperatures are <br />lowest during the winter months and highest during the summer months. Temperature <br />generally fluctuates most in the shallowest well (17-B) and least in the deepest well (95-1 ). <br />Temperature ranges for the 1998 water year remained within those observed previously. <br />The pH for all wells changed from slightly basic during the end of water year 1996 to <br />shghtly acidic at the beginning of water year 1997. During this water year (1998), the pH <br />of well 17-B remained slightly acidic, we1194-1 returned to a more neutral range, and well <br />95-1 turned shghtly alkaline. <br />Electrical conductivity (EC) levels remained consistent in well 17-B and dropped slightly <br />in wells 94-1 and 95-1 from the prior water year. As with the springs, total dissolved <br />solids (TDS) levels rise in the winter and decrease in the summer. Overall, TDS levels <br />have shown a slight decrease during this water year. <br />Well 95-1 illustrated fairly large changes in concentrations of ammonia, bicarbonate, <br />calcium, chloride, magnesium, manganese, and sulfate between the third and fourth <br />quarters of the 1997 water year. Monitoring during this water year indicated that <br />ammonia, bicarbonate, chloride, magnesium, and manganese returned to the range <br />historically observed. Calcium and sulfate appear to fluctuate more widely for well 95-1 <br />than for the other wells, but this appears to be normal for this well. <br />Many of the trace elements found to be below the detection limits for the springs sampled <br />were also found to be below detection limits for the wells sampled. These trace elements <br />are arsenic, cadmium, mercury, manganese, nitrite, nitrate, nitrate/nitrite, selenium, and <br />zinc. Other trace elements found at detectable limits aze consistent within each well at <br />levels that do not indicate high or low fluctuations of these elements. Overall, elements <br />that aze detectable and those that aze not have been consistent throughout the well <br />sampling program at the Carbon Junction Mine. <br /> <br />-5- <br />