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l <br />i <br />seasonal fluctuations, and water levels this year within their historic <br />ranges, although some lag time for the spring recharge is observed. <br />Well YOV28 (downgradient of the 1996/99 mine pit in Armand Draw) has <br />I <br />experienced a decrease in water levels since August 1996. Well YOV29 <br />has experienced a decrease in water levels since October 1998 and has <br />been dry since May 2000. Well YOV30 has also experienced a decline in <br />water levels in past years, although, recent measurements show an <br />increase. <br />- Wadge Coal. Five wells; YW7, 19, 28, 29, and 30; monitor the Wadge <br />coal; seam. Monitozing at Well YW14 was discontinued in July 2001 (see <br />Introduction). Well YW28 exists in the Armand Draw basin, all others <br />exist in the Sage Creek basin. Due to the low aquifer transmissivities, <br />seasonal water level fluctuations are much less pronounced than the <br />alluvium and overburden, and are often masked by water sampling effects. <br />Most wells exhibited water levels this year within their historic <br />. ranges. Well YW28 {downgradient of the 1996/99 mine pit in Armand Draw) <br />has experienced decreasing water levels since October 1996. In the Sage <br />., Creek basin, water levels at Well YW30 are increasing, while water <br />levels at Well YW29 are decreasing. <br />- Wadge Underburden. Four wells; YWU16, 28, 29, and 30; monitor the. <br />Wadge underburden. Well YWU28 exists in the Armand Draw basin, all <br />others exist in the Sage Creek basin. Most of these wells do not <br />exhibit any significant seasonal variation, although some variation from <br />year-to-year is evident. Wells YWU16 and 30 exhibited water levels this <br />ye air within their historic ranges. Well YWU28 (downgradient of the <br />1996/99 mine pit in Armand Draw) has experienced decreasing water levels <br />from June 1996 to September 1997, but since then has experienced an <br />increase in water levels. In the Sage Creek basin, Wells YWU29 and 30 <br />have experienced decreases in water levels since May 1999. <br /> <br />- Wolf Creek Coal and Underburden. One well each monitors these two <br />units, YWC31 and YWCU31. Both wells exist in the Sage Creek basin. <br />Well YWC31 exhibits very little seasonal variation. Its water levels <br />have been increasing since 1995. Well YWCU31 is normally dry. <br />4 <br />