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average). • <br />The second well in the Cow Camp Creek alluvium, YeLI 69-A, was completed in the summer of <br />1988. [t is located approximately one and one-half miles downstream of Yell 46-A. In <br />1993, water samples at this well displayed a CaNgNa-S04 type water. The average annual <br />TDS value of 3426 mg/l is within the historic range. The average TDS value for this well <br />in 1993 was 32 percent higher than Yell 46-A. This is most likely a result of the high <br />amount of salts in the soils of Twentymile Park (see later discussion of the Twentymile <br />Park and Fish Creek surface water systems). <br />Well 68-A, completed in the Bond Creek alluvium, was also completed in the summer of 1988. <br />It is located approximately two miles downstream of the 008 pond. The eater samples at <br />this well have displayed a CaMgN a-504 type water since the onset of monitoring. The <br />average TDS value of 5416 mg/l during 1993 was greater than the historic range (4801 to <br />5089 mg/l). <br />Lennox-Vadge Interburden. Two wells ere used to monitor the water quality of this strata: <br />21-LYI and 42P1-LYI. Yell 42P1-LYI did not have enough water in its rasing to sample this • <br />year. VeIL 21-LY[, situated outside of the permit boundary and downdip of prelaw mining <br />and an old fly ash pit previously operated by Colorado-Ute Electric Association, displays <br />a CeMg-504 type water (Table 6). TDS levels peaked in 1984 (2185 mg/l average) and have <br />generally decreased since then. This decrease of TDS values may indicate that the most <br />readily soluble constituents may have been flushed from the system in prior years. <br />Vadge Coal. Two wells are used to monitor the water quality of this strata: 17-Y end <br />19-Y. Yell 17-Y, situated downdip from spoils, receives recharge from the Vadge <br />Impoundment and the Little Grassy Creek alluvium. It displays a Na•504 type water (Table <br />7). The average TDS value at this well in 1993 (3451 mg/t average) is within the historic <br />range. Nell 19-V, downdip of mining, has an anomalous water quality with a high <br />percentage of sodium and bicarbonate. TDS values have fluctuated very little since 1981, <br />ranging from about 800 to 900 mg/l. <br />Wolf Creek Overburden/Vadge Underburden. Three wells ere used to monitor this strata: <br />7-VCO, 8P1-U, end 11-U. Yell 7-VCO, located downdip of the Volf Creek pit, is a CeMg-504 <br />type water (Table 8). The annual average TDS value of 1526 mg/l is within the historic • <br />range. <br />6 <br />