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Water quality data from backfilled areas of the adjacent Eckman Park mine indicate a magnesium, calcium, sulfate <br />• <br />dominance. <br />Since the trend in water quality change appears to be a proportional increase in calcium and magnesium <br />components over the sodium component, then the resultant sodium absorption ratio (SAR) of the water would be <br />expected to decrease. Mine-related changes to surface water quality are, therefore, not expected to result in an <br />increase in the sodiwn hazard with respect to irrigation use. <br />The effects of reclamation in mitigating changes in water type could not be determined from the baseline program <br />data. According to three years of records collected by Rowe and McWhorter (1978) and Skogerboe (1979), the <br />change in water type in mined areas is apparently along-term effect, although only on that reach of the receiving <br />stream wlticlt is adjacent to and just downstream from the mined area. <br />The Bureau of Land Management (1979) and the Office of Surface Mining (1982) concluded that the change in <br />water chemistry will not be harmful to aquatic life in the receiving stream and dilution of the mixed ions makes the <br />effect less noticeable downstream. Therefore, no adverse impact on the hydrologic balance is anticipated to result <br />from the changes in the water chemistry of the effluent discharge. <br />• <br />Chanties in the Volume and Timing of Surface Water Discharges <br />Collection and detention of disturbed area runoff in sedimentation control structures will pote~ttially affect the <br />normal pattern of surface water discharge from the permit and adjacent areas. The detention time required to <br />achieve effective sediment control may result in an extension of the normal flow period and some alteration of <br />normal flow variations. The ability to control discharge from the sedimentation structures to a certain extent could <br />be significant in approximating normal flow conditions. Since 1984, flows from Ponds A, D, and F have changed <br />Foidel Creek from an ephemeral to a perennial stream. The minor variations which have occurred in the timing <br />and volume of surface water discharge do not adversely affect the surface hydrologic environment. <br /> <br />1996 Permit Ren. Petmit Renewal 780-]44-27 Revised 3/18/97 <br />