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haw stabilized. Wall d2, located in the south central part of the permit azea, usually <br />• does not haw enough Tatar in its casing to sample, u was the case this yeas. <br />Milliequiwlent data from previous samples has been included in Appendix C. <br />~ Wadga Coal. Two rolls are used to monitor the rater quality o! this stratum. Wall 17 is <br />located just rest of NPDES 002. The TDS trend since 1990 nppsazs to be stable. Well 19 <br />is located in the southraet pazt o! the permit azea. Its TDS trend also has stabilized. <br />Wolf Creek Overburden/Wedge Underburden. Throe rally aze used to monitor this stratum. <br />Wall 7 in located helot the Wol! Creak pit. It displays an increasing TD9 trend. Well <br />SP1 is located helot a reclaimed portion of the Wedge pit in the southwest corner of the <br />permit area. Tha TDS trend for this roll has stabilized. Wall 11 ie located just rest o! <br />the PeaCoCO Pond, helot a reclaimed portion of the Wedge pit. It displays a stable TDS <br />trend. <br />Trout Creak Sandstone. Well 5 ie used se the potable rater supply for the Seneca II Mine. <br />Zt displays a decreasing TQS trend. <br />• Spoils. Three walls monitor the spoils above NPDES 002. Well 25, the upper well, does <br />not display a distinct TDS trend. Well 26, the middle call, displayed an increasing TTIS <br />trend until 1990/1991, but has recently decreased. Well 27, the bottom wall, displays an <br />increasing TDS trend. <br />well 61 is located in the eouthreet portion of the permit azea. It displays sn increasing <br />TDS trend. Well 62 is located above NPDES 004. It displays an increasing TDS trend. <br />Compazieon of Ground Water Quality to Water Vsa Standards. SCC hoe compiled lists of <br />etandazda for irrigation (Table 5) and livestock fTable 6). These lists aze composed <br />mostly of Colorado Department of Health (COON) etandazds, although other agency standards <br />haw bean used if they are more stringent or if the CDOH has no standard for a particular <br />pazamater. Sea SCC's Yoast Mine Permit Application, Tables 7-21 and 7-23, for a more <br />detailed ezplanation oP these standazds. <br />Table 7 pzovides s comparison of ground Tatar quality to irrigation etandazde. Standazda <br />that sera ezceaded aze thlorida nt one roll, pe at three Tells, fluoride at three Tells, <br />i <br /> <br />