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listing percent milliequivalents of major ion and TDS values. This table is followed by a <br />• statistical summary of water quality for the entire period of record. This summary is followed <br />by the individual water quality report for each sample collected and finally by a sampling <br />remarks report. <br />Alluvium. Well GW-S2W-6A2 monitors the Hubberson Gulch alluvium downgradient of the II-W <br />South area before it is influenced by discharges from central Ipond 0061 mining area. Samples <br />from this well display aCaMg-HCO~ type water with an average TDS value of 857 mg/I Irange <br />356 to 970) and a nearly level TDS trend since 1986. <br />Well GW-S2W-7A2 monitors the Hubberson Gulch alluvium below Well BA2 and below the <br />discharge from the central mining area. Samples from this well display a CaMg-HCO~SO,CI <br />type water with an average TDS value of 1172 mg/I Irange 760 to 1440, with one likely outlier <br />with a value of 3170 mg/I) and a slightly increasing TDS trend. <br />Wadge Overburden. Well GW-S2W-20V was a flowing monitor well that existed downgradient <br />of the II-W South area. It was sampled from 1980 to 1985 and was abandoned in 1994. <br />Monitoring was discontinued due to a failure of the annual seal of this triple completion well <br />(Wadge Overburden/Wadge Coal/Wolf Creek Coall. This failure was indicated by [he <br />observation that flow from one of the wells would vary if the valves from the other two <br />flowing wells were opened or closed. Flow at the ground surface at this site would also be <br />noted when all three valves were closed. This annular seal failure appeared to affect pressure <br />measurements more than water quality, since all three wells displayed distinctly different water <br />quality. Well ZOV displayed at MgCa-HC03 type water with an average TDS value of 644 mg/I <br />Irange 352 to 7121. <br />Wells GW-S2W-40V1 and 40V2 were designed as water level observation wells only. Their <br />small diameters I1 and 0.75 inches, respectively) preclude their use as water quality monitor <br />wells. <br />Well GW-S2W-180V exists between the middle and proposed south pit areas. Water quality <br />monitoring at this well was discontinued after the October, 1995 sample was collected. <br />Monitoring was discontinued since it was not downgradient of the current mining area and also <br />because a sampling pump was lost in the well in May, 1994. This well displayed a NaMgCa- <br />HCO3 type water with an average TDS value of 652 mg/I Irange 180-798). <br />Wadge Coal. Well GW-S2W-2W was a flowing monitoring well that existed downgradient of <br />the II-W South area. It was part of the triple well completion described in the Wadge <br />overburden section and was also abandoned in 1994. Samples from this well displayed a <br />• MgCaNa-HCO~ type water with an average TDS value of 559 mg/I Irange 334-6161. <br />147 <br />