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<br /> <br />The average annual rainfall is 8.41 inches. Therefore, the percolation rate through a <br />9.1 acre coal refuse pile, assuming an ideal buffer, is calculated as follows: <br />8.41 in. 1 ft. 43.560 sg. ft. <br />Flow Rate = yr. X 12 in X 9.1 acre X acre X <br />~. 1 day 1 hr = 0.01 cfs <br />365 days X 24 hrs. X 3600 s <br />The comparable average Colorado River flow is 3,801 cfs. <br />Table 19-1 lists the assumed value of the percolated water and the regulatory limits <br />for compliance in the State of Colorado. The comparison in this table shows that the <br />quality of the percolated water is equal to or better than the current standards for the <br />Colorado River. <br />The dilution factor for the percolated water to the Colorado River is 1 to 380,000. <br />If any one constituent in the percolated water was 100 times greater than existing in <br />the Colorado River, the resultant concentration of the constituent in the river would <br />increase only by a factor of 0.0003. <br />In summary, the percolated water is of relative good quality. The flow rate of <br />percolated water is insignificant when compared to the Colorado River flow rate. <br />Therefore, the quality of the Colorado River would not be significantly affected if all the <br />precipitation that falls on the Roadside Mine coal refuse pile percolated directly into <br />the river. <br />• 19-12 (New 3/1/96) <br />