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eh <br />• ESPEY, HUSTON 8 ASSOCIATES, INC. <br />3.1.4 Water Pollution Facilities <br />Water pollution facilites have been constructed under CMLRB Permit <br />No. 79-9. These facilities and design criteria aze presented herein to meet federal <br />regulations. <br />The total basin contributing flows to the upstream end of the site is 1.36 <br />squaze miles. The basin is nearly squaze in shape with a width of 6,000 feet and a <br />length of 6,500 feet. The average slope of the basin is 11 percent. There is also a <br />basin of 0.09 squaze miles that contributes flow along the mine azea. The slope of <br />• this azea is 14 percent. (See Exhibits C-7 and C-8). <br />The average annual precipitation for the site is 19 inches. Because it <br />was determined that the principal source of run-off at the site would be from storm <br />events, the 10-, 25- and 100-yeaz, - 24-hour rainstorms were investigated. The run- <br />off calculation results are tabulated in Table C-14. <br />Soils in the basin aze of three major types, the Cumulic Cryoborolls, <br />Torriorthentic Haploboralls, and the Camborthids Argiboralls. Properties of these <br />soils aze listed in Table C-15. <br />Flow generated upstream of the disturbed azea has been concentrated by <br />a berm at the upstream end of the disturbed azea and forced into an open channel <br />that diverts the flows azound the disturbed azea. This berm is 6 feet high and the <br />outlet will be the interception channel. It will not be topped by the 100-yeaz event. <br />It has been rip rapped in steep portions and revegetated as discussed in the <br />reclamation plan, Chapter M. This interception ditch will form the western <br /> <br />~ 19°~ <br />C -31 a ~~~. <br />