REP16123 - Laserfiche WebLink

Home Browse Search

ROADSIDE MINE 2001 AND 2002 AHR REVIEW 2001 AHR The Division has completed review of the 2001 Annual Hydrology Report from the Roadside Mine. This review has been organized by comparing results presented to the predictions contained within the probable hydrologic consequences (PHC) section of the permit. Surtace Water PHC Prediction: Effects of minewater consumption and discharge on the quantity of flow in the Colorado River will be negligible. The AHR data support this prediction. PHC Prediction: The effects of subsidence on flows in Rapid Creek and Cottonwood Creek will be negligible. The AHR data support this prediction. PHC Prediction: Discharges will increase the salinity of the Colorado River by 0.1 to 0.2%. The calculations in the AHR indicate that the contribution was less than the predicted case when measured. The calculated salinity increase was 0.05%, slightly lower than the prediction. The data for the full year show that the dissolved salts and volumes of discharge were within the ranges seen in previous years. PHC Prediction: There will be increased sedimentation to to the surface disturbance. This is intuitively correct, although the data do not indicate it occurred. PHC Prediction: There will be increased TDS in alluvial groundwater from mine water discharge and refuse pile leachate. An insignificant impact is projected. That prediction is confirmed by the 2001 data. PHC Prediction: There will be no impact on the quality of the Rollins sandstone groundwater. According to the data in the report, there was no impact. PHC Prediction: There will be subsidence-caused dewatering of the strata overlying the workings. Since the mine has been closed, there are no more inflow data to demonstrate this. PHC Prediction: There will be no impact on the alluvial groundwater of Rapid Creek and Cottonwood Creak.