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cable 7-17 indicates water quality in the Vadge underburden is variable. Yell YYU28 has • <br />exhibited four water types, varying seasonally es calcium in the spring yields to <br />magnesium during summer end fell end to sodium in winter. Bicarbonate in the spring and <br />summer yields to sulfate as fell progresses into winter. eiterbonete is the dominant <br />anion et Vell YVU29 and both calcium and magnesium exert almost equal influence during ell <br />seasons. VeLI YVU30 predominantly exhibits a MBCeHC03504 water type, with sodium exerting <br />some influence during the summer. <br />Total dissolved solids in both YYU28 end YVU30 commonly exceed 7000 mg/l, ranging between <br />996 end 7550 mg/l and between 1198 end 1406 mg/l, respectively. TDS et Yell YVU29 has <br />ranged much lower, from 388 up to only 716 mg/l. Sulfate et ell three wells has not <br />exceeded 700 mgl, ranging more than 300 mg/t at YYU28 (366 to 696 mg/I). Yell YVU29 <br />exhibited one of the lowest ranges of sulfate toncentretions for all monitoring wells at <br />the Yoast mining area, ranging from only 14 mg/l to 777 mg/l. Both sulfate end TDS in [he <br />Madge underburden show only slight seasonal variability, generally lowest in the spring, <br />gradually increasing es summer progresses into fall. <br />Field pH measurements have also varied among [he Madge underburden wells, mostly above 7.0 • <br />S.U. (slightly alkaline). Vell YVU29 has had one field pH value below 7.0 (6.9 - 6/93), <br />and et VeLI YYU30, three values less than 7.0 (6/92 through 6/93) have been measured. No <br />distinct seesone( pattern is evident for pH in the Vadge underburden. <br />Hardness as CaC03 measured at both YVU28 end YYU30 has exceeded 1000 mg/l (1128 mg/l and <br />1082 mg/1, respectively). Hardness has ranged much (over et TVU29 (338 to 503 mg/l ), yet <br />ground water in the Yedge underburden is considered very hard. <br />Several trace elements have been measured at detectable concentrations in the Vadge <br />underburden, including Be, B, F, Fe, end 2n. At Vell YVU28, trace elements Cd, Cr, Cu, <br />Pb, Ni, end Ag were measured slightly above analytical detection limits (ug/l level only) <br />in the first two samples collected, but have not been detected in subsequent sempl es. Of <br />the five trace elements first mentioned, only iron at Yell YYU30 has been measured above 1 <br />mg/l and has not exceeded 1.5 mg/l. <br />Yolf Creek Coel. Yell YYC31 monitors water quality in the Yolf Creek coal seam end is <br />located in the southeastern portion of the Toast mining area. Table 7-18 presents summary <br />information regarding water types depicted on the trilinear diagram and table listing of <br />percent milliequivelent values found in Appendix 7-4. Well YVC37 commonly exhibits e <br />54 Revised 03/01/95 <br />