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<br />trend had been observed in the Flume Gulch well (Coy) until January <br />1986. TDS values for 1986 and 1987 show an upward trend. The <br />increasing trend in the Coy alluvial well has to be natural and is <br />similar to that observed in the J1 alluvial well. Therefore, the <br />increase observed in well J1 could be natural. <br />Plots for wells 81-03A and Lux are not presented because of the <br />lack of data to this date. Values for TDS are approximately 1100 and <br />500 mg/1, respectively. Two springs are located near the Lux well and <br />were monitored in December of 1987 prior to the start of mining in the <br />Browning and Colt pits. TDS values for the west and North Springs <br />were 1860 and 1300 mg/1, respectively. The West Spring is thought to <br />• originate from the First White Sandstone aquifer, while the North <br />Spring's source of water is thought to be from an aquifer above the <br />First White Sandstone and likely the Coyote alluvium. <br />Colt Seep and Cottonwood Spring within Trapper Mine were <br />monitored in June 1987. The Colt Seep TDS value was near normal at <br />2264 mg/1. The Cottonwood Spring TDS was measured at 1126 mg/1 in <br />June 1987. <br />3.2 pH <br />Field pH is an important parameter to measure because some coal <br /> spoils have the potential to increase acidity of the ground water <br /> which increases the mobility of most heavy metals. A pH of less than <br />3-7 <br />