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• 6rovnd Water Level Summary. AL1 alluvial cells are showing distinct seasonal water level <br />fluctuations in response to periods of precipitation recharge or the lack of <br />precipitation. Overburden and coal well eater levels are fluctuating in response to the <br />precipitation recharge, induced ground water flow to the mine pits, and in some cases, <br />changes in reservoir water levels. Spoil yell water levels still indicate that only the <br />furthest dorllslope highwall portions of the spoil exhibit significant amounts of <br />saturation. Levels rn a spoil well near the Wadge Iv~oundment rs largely controlled by <br />water level fluctuations in the impoundment. Water levels in several cells this year were <br />higher than they have been before as a result of high spring runoff. Dewaterinq by the <br />Wolf Creek coal mine pit has resulted in lover than normal eater levels in most of the <br />yells monitoring that seam. <br />Water puality. Ground rater sasples were collected from 19 yells on a biannual basis. In <br />addition, one cell (90y42) that is required to be sampled did not have enough rater to <br />sample. The parameter list used for all cells sampled in 1995 is given on Table 4. <br />Analyses have been performed by AC2 Laboratory in steamboat 9pzings, Colorado since May <br />31, 1993. AC2 Laboratory performs all analyses by EPA or equivalent methods. samples are <br />• delivered the day of collection to the lab in an iced cooler. <br />The folloring dlacussron of the analytical data collected during the reporting period is <br />arranged by strata being monitored and coincides with the format (by aquifer type) in <br />which the analytical data are presented in Appendix D. The discussion of rater quality <br />rill be limited to a deaeript>.on of total dl ssolved solids (TD S) concentrations. A <br />separate section, Comparison of Ground Water puali ty to Water Use Standards, rill d1aCU99 <br />ally limple9 thdt exceed riCGL naG 9tandard9. <br />Data for each yell in this appendix beings with a listing of the water quail ty data <br />collected during this year, followed by remarks explaining the sartplinq procedure. This <br />ie followed by a plot of TD9 versus time for the entire period of record. The regression <br />line on this plot is generated by a method mown as LOWS99 (Locally Weighted 9catterplot <br />8moothinq). A smoothness factor of 0.5 (on a scale of 0 to 1) was used. Finally, this <br />plot is followed by a table listing historic TD9 valves and percent millequivalents for <br />major ions. <br />• Alluvium. Well 32 is located furthest upstream on Little Gras ay Creek. Eeyiew of the TD9 <br />plot indicates an increasing trend. This is due to the contribution of eaters from Spoil <br />5 <br />