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year were 8.55 and 2180 µmhos/cm and the mass average values for the mine <br />inflows study were 8.50 and 2360 µmhos/cm. <br />r1 <br />lJ <br />L~ <br />• <br />The water from inflows in the Roadside Mine continued to be diverted into <br />abandoned areas of the mine in 1988. The water level shown of the Mine <br />Inflows Map was estimated from the fact that the water level had risen <br />to the lowest accessible seal by the end of December 1988. Measured inflows <br />for 1988 were lower than in 1987, 136.9 vs. 155.9 gpm. The mass average <br />pH was similar for 1988 and 1987, 7.8 and 7.7 respectively, and the mass <br />average conductivity for 1988 was lower than for 1987, 1021 vs. 1115 <br />µmhos/cm. <br />CONSUMPTIVE USE <br />During the 1988 water year the only <br />water for the office and bathhouse. <br />water usage for the year. <br />consumptive use of water was domestic <br />Table C88-1 represents the consumptive <br />IMPACTS <br />The total TDS discharged to the Colorado River as Mine discharge was <br />calculated to be 222 tons or 0.0135% of the TDS at Station 955. Low flow <br />in the river was on Oec. 16, 1987. On that day the river's flow was 1380 <br />cfs with a conductivity of 1300 µmhos/cm and mine discharge was approximately <br />66 gpm at 2500 µmhos/cm. The mine discharge would have increased the river <br />conductivity by 0.13 µmos/cm. <br />There was no detectable impact of this operation on Cottonwood or Rapid <br />Creeks during the year. <br />Grading on the lower benches of the Cameo refuse disposal area No. 1 was <br />partially done to alleviate concerns that the drainage pattern was <br />contributing to the higher than projected water level in the piezometers. <br />Monitoring result on these piezometers in 1989 could show lower water level. <br />Mine discharges will impact the river more in 1989 because both mines will <br />be discharging. <br />-4- <br />