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Ground Water Leval Svermnry. All al luviel xalle are shoring distinct seasonal rater level <br />fluctuations in response to periods of DraciDitatioa recharge or the lnek of <br />DreciDitntioa. Overburden and coal wall venter levels era fluc tuatiaq in response to the <br />precipitation racharge. Seduced ground rater flow to the mina pits, end is some cases, <br />changes 1n reservoir avatar levels. Spoil wall rater lavale still indlcnta that only the <br />lurtbeet do~melope hlghrall portions of the spoil exhibit significant amounts of <br />saturation. Levels in a spoil cell near the Wndge impoundment ie largely controlled by <br />valor level fluctuations in the imDOVndmant. Water levels is several relle thle year rare <br />blQher than normal ae a result of high apriaq runoff. Dewateriaq by the Wolf Creek coal <br />mina pit hoe resulted in lover than normal rater levels is mat of the ralle monltorinq <br />that seam. <br /> Water Quality. Ground eater samples xere collected from 19 relle oa a biannual basis. in <br /> addition, one xell (SOV67) that ie required to De eempled aid not have anouQh water to <br /> sample. The Daremeter list used for all ralle sampled this year ie Qivan oa TeDle 4. <br /> Analyeea have bean performed by ACZ Laboratory is Staemboat Spriage, Colorado since may <br /> 31, 1983. ACZ LeDOratory performs all analyaee by HPA or aquivnlant methods. Semylae era <br /> delivered the nay of collection to the lab is an iced cooler. <br />• <br />The fo11or1nQ dlecueeion of the analytical data collected during the reporting period ie <br />arranged by strata being monitored and colncldee ritb the format (by aquifer type) la <br />which the analytical data era presented is Appendix D. TDe discussion of water quality <br />will be limited to a description of total dissolved solids (TDS) concantratioae. A <br />separate section, Comparison of Ground Water Quality to Water Oee standards, will discuss <br />nay samples that exceed water use standards. <br />Data for each sell is this appendix beings ritb a listing of the water quality data <br />collected durlaQ thle year, followed by remarks axDleiniaq the eamDllnq procedure. This <br />ie follorad by a Dlot of TDS versus time for the entire period of record. Tha ragreasioa <br />line Oa this plot ie generated by a method known ae LOW855 ILOCelly WEighted Scatterplot <br />Smoothing). A smoothness factor of 1.0 (oa a scale of 0 to 1) was used, which results is <br />maximum "emootDiaQ'. Finally, this plot ie followed Dy a table listing historic TDS <br />values end percent milllequivalants for major ions. <br />. Alluvium. Well 37 ie located furtheei upstream oa Little Graeay Creek. Review of the TDS <br />plot indicates m increasing [rend. TDie is due Co the contriDUtion of waters from spoil <br /> <br />