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Ground Water The ground Hrater monitoring points on Cottonwood and Rapid Creeks were monitored twice during the Year. Results of the monitoring are listed on data page GA-2. Diagrams G97-1 through 6 (from the Peabody system) are graphical representations of the water level elevation in these wells from 1984 to 1997. Table G98-1 was prepared to show average water levels in the spring, corresponding to high water level in the adjacent creeks and in the fall or near low water levels. Measured water level in all wells was equal to or lower than normal. 1 Piezometers CRDA-01 through 06 at the Cameo Refuse Disposal Areas (CRDA) No. 1 ' and No.2 continued to be monitored quarterly. Page GC-7 shows the measurements for this Year. Total depth of each well and the "Critical Depth° is also shown. A ' graphical representation of the water level elevations in CRDA-01 through 1997 is shown on i7rayiaiti G97-i3, ui1cG eydfil iiuiii iiie reaoody system. vdaterieveis increased slightly this Year. Table G97-2 shows statistical information on the CRDA ' piezometers through 1997. Multiple listings for a site represent time frames for which the top of the pile was at different elevations. Separate listings also occur to indicate dry and problem readings. ' The 200 series piezometers were buried when the June 1998 readings were taken but were uncovered before the August readings. The depth of piezometer 406 was apparently measured wrong in June and August 1998. The reading indicate that the ' water level had exceeded Critical Depth. Subsequent monthly observations have not shown any reading above 81.0 feet. It is assumed that the initial readings were in error. The results of water level measurements at the unit train loadout this Year are listed on ' data page GB-1. Diagrams G97-7 through 12 are graphical representations of water level elevations in these piezometers through 1997. Table G97-3 shows historical statistics on these water levels corresponding to high and low flows in the adjacent river. Water levels were lower than the average for all wells at the site. Data page GD- 12 contains the result of full suite water analysis done on UTL-02 and 04 during the Year. 4 A former mine dewatering hole (N -1) located at the North Decline area of the mine is now being used to monitor the water level in the abandoned portions of the Roadside AHR 98 Page 5 5-1-99