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• <br /> <br />• <br />EFFLUENT PARAMETER <br />Flow M3/day (MGD) <br />Total Suspended Solids <br />Total Iron <br />pH <br />FREQUENCY <br />Weekly <br />Monthly <br />Monthly <br />weekly <br />In addition, at the request of Colorado Mined Land Reclama- <br />tion personnel, Wyoming Fuel will measure total dissolved solids, <br />total manganese and SAR or, a monthly basis during times of discharge. <br />Flow will be measured by timed filling of a calibrated container <br />at the principal spillway discharge point. <br />Alternative Water SuPOly Information <br />An identification of the extent to which the proposed surface <br />mining activities may proximately result in contamination, diminution <br />or interruption of an underground or surface source of water within <br />the proposed mine plan or adjacent areas for domestic, agricultural, <br />industrial or other legitimate use is outlined in the Willard Owens <br />report found at the end of this Appendix. <br />In general, mining in Pit 1 is not expected to cause significant <br />or identifiable modification in either the surface or groundwater <br />regime beyond the boundaries of the tract. <br />As mining progresses, seepage from the Coalmont beds into the <br />mine will occur along the highwall and advancing face. The silt- <br />stone unit overlying the Sudduth seam will become drained up <br />gradient in advance of the excavation. This shculd be a local <br />effect, probably extending not more than 500 feet in advance of• <br />the excavation. Some water spay also enter the pit from the under- <br />lying sandy unit of the Pierre Formation if fractures are encountered <br />which penetrate the shales underlying the Sudduth Seam. Experience <br />with the existing pit, and permeability tests conducted on rock <br />samples indicate total groundwater seepage into the pit will probably <br />not exceed 15-20 gpm, unless significant faulting is encountered. <br />-5=1- <br />