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• discharge pipe to they dry drainage. During Pilot Plant operations, this <br />pond will serve as a desiltation pond for precipitation run-off from the <br />disturbed areas and the plant site. Both interior and exterior: berm slopes <br />pre constructed to aplrroximately 2.0 horizontal to 1.0 vertical. <br />D.3.5 Evaporation Ponds <br />A series of three evaporation ponds may be built to receive waste streams <br />resulting from the pilot solution mining operations. The following <br />discussion presents a description of all three ponds. <br />A series of three evaporation ponds will be constructed to receive plant <br />waste water. The waste streams that will be directed to those ponds are: <br />o Boiler blowdown water <br />o Cooling tower blowdown water <br />o Bleed-off watf~r <br />• o Water treatment system purge <br />The design evaporation rate used for the evaporation ponds is 1 gallon per <br />minute per acre, which is based on the operating experience of Rio Blanco <br />Shale Oil Corp, at Tract Ca. The ponds will be a balanced cut and fill <br />construction. Earthen berms will be compacted to 95 percent maximum density <br />(ASTM-1557). Liner bedding material, consisting of rock free on-site <br />earthen material will be placed prior to the installation of a 20-mil <br />Hypalon pond liner. <br />Flow to the three evaporation ponds, evaporation surface areas, and design <br />safety factors are given in Table D-1. <br />Figure D-6 presents a typical cross-section of the ponds. Interior berm <br />slopes will be 4.0 horizontal to 1.0 vertical. Exterior berm slopes will be <br />2.0 horizontal to 1.0 vertical. <br />• <br />D-4 <br />