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[~ RESULTS - MONITORING WELLS FOR WATER YEAR 2003 Three goundwater monitoring wells were sampled during the 2003 water year. The wells sampled are designated 17-B, 94-1, and 95-1. Well 17-B is 600 feet west of the comer of the northwest permit boundary within Carbon Junction Canyon. Well 94-1 is located adjacent to the east edge of the south pit. Well 95-1 is located approximately 850 feet south-southwest of the future pit boundary. Well 17-B is located upgradient of any disturbance related to mining. Well 94-1 is located within the azea disturbed by mining, and well 95-1 is located downgradient and outside the proposed coal mining disturbance. As such, these wells (94-1 and 95-1) would be expected to show any changes resulting from mining disturbance. These wells may also show changes to groundwater due to adjacent sand and gravel mining on Ewing Mesa. During the winter of 2003, well 94-1 was reclaimed during the backfilling, grading, and topsoiling of the South Pit. Future sampling of well 94-1 will not be undertaken, though well 95-1 will reflect any effects from the upgradient mining and reclamation. Wells 17-B and 95-1 were sampled twice (December 27, 2002 and March 25, 2003) during this water year. Well 94-1 was reclaimed between the December 2002 and March 2003 samplings. Summaries of sampling data from the goundwater wells for the 2003 water year are contained in Tables 4, 5, and 6. Depth to water data was not wllected for ~ • well 95-1 in March 2003. As noted, the final data collected for well 94-1 was on December 27, 2002. Depth to Water After slight to significant water level declines in all wells during the winter of 2000-2001, depth to water levels have returned to prior historic ranges. The water level in well 17-B this water year remained consistent within the historic range and was slightly elevated during March 2003. Tlvs may be a result of the heavy snowmelt at that time and the relatively shallow well. Water levels in well 94-1 have decreased slightly from those recorded in the mid-1990's, but have remained consistent over the last two water years. Water depths at well 95-1 remained consistent with the historic levels recorded over the last nine water yeazs. Water Temperature Water temperature in the wells fluctuates regulazly with the seasons. Water temperatures are generafly lowest during the winter months and highest during the summer months, though the temperatures respond to ambiem 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 2003 water yeaz remained within those observed previously for the wells. Carbon Junction Mln¢ Page 8 Maual Hydrobgk RsPoK for Waxer Year 2003