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Depth to Water After slight to significant water level increases in all wells during the winter of 2000-2001, depth to water levels have returned to prior historic ranges. Water Temperature Water temperature in the wells fluctuates regularly with the seasons. Water temperatures aze generally lowest during the winter months and highest during the summer months, though the temperatures respond to ambient weather conditions during the season. Temperature generally fluctuates most in the shallowest well (17-B} and least in the deepest well (95-1). Temperature ranges for the 2004 water year remained within those observed previously for the wells. pH The pH for all wells changed from slightly basic during the end of water yeaz 1996 to slightly acidic at the beginning of water yeaz 1997. This change was also noted in the springs on-site. During water year 2001, the pH of the three groundwater wells rose slightly, with the largest change in well 17-B (6.9-7.5). In water yeaz 2003, pH at well 17- B attenuated in value from prior yeazs with only 0.1 variation in value between the dry and wet seasons. pH at well 94-1 rebounded from a slightly acidic value (6.9) during the last quarter of the 2002 water yeaz to alkaline in water year 2003 {7.8). The pH of well 95-1 increased significantly in alkalinity over the course of this water yeaz (7.7-9.2). These changes in value may reflect larger anion concentrations in the wells during seasonal periods. Electrical Conductivity (EC) Over the last ten yeazs, electrical conductivity (EC) values were highest for well 94-1 (mid-mine), median for well 95-1 (downgradient), and lowest for well 17-B (upgradient). EC levels this water year decreased to a ten-year low for well 17-B (550-170). Levels for well 95-1 followed a general downwazd trend beginning in water year 1997. Total Dissolved Solids (TDS) Total dissolved solids (TDS) levels in well 17-B remained within historic values during this water year. Well 17-B shows the least overall variability for TDS values of the wells, ranging from 235 to 470 mg/I, over the past ten yeazs. Well 94-1 showed the widest range in TDS values from 720 mg/L (W.Y. 1999) to 1490 mg/L (W.Y. 1995). Since water year 1998 the TDS concentrations for well 94-1 have been 720-970 mg/L, a significantly narrower range than prior to that time. TDS values for well 95-1 have consistently decreased since water year 1997, and this year was consistently lower than those of upgradient well 17-B. Carbvn Junctbn Mine Paga 9 Annual Hydrologk Report fnr Waur Year 2004