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~~ <br /> <br />• <br />that occupies the volume of dissolved nahcolite, and (2) an anticipated minor <br />quantity of water that permeates into the formation. This latter quantity is <br />yet unknown, but it is. anticipated to be very small and is assumed to be zero. <br />The pilot plant operation will attempt to quantify this loss. <br />D.3.2 Cavity Dimension <br />The size and shape of each solution-mined cavity will vary with time. The <br />cavity shape is presented in an idealized manner. <br />The actual cavity shape will be verified as the Pilot Plant operations <br />proceed. The Bulk Sampling Program involved the extraction of only 150 to 200 <br />tons of nahcolite, hence judgments as to the ultimate shape of the cavity at <br />maturity cannot be made until several months after Pilot Plant start-up. <br />D.3.3 Mud Pits <br />Several mud pits will be built to receive cuttings produced during drilling. <br />The pits will be er.cavated and lined with sodium bentonite to restrict <br />seepage. <br />D.3.4 Evaporation Po rid <br />An evaporation pond will be built to receive waste streams resulting from the <br />pilot solution mining operations. The waste streams that will be directed to <br />this pond are: <br />° Boiler blowclown water <br />° Cooling tower blowdown water <br />° Water treatment system purge <br />The design evaporation rate used for the evaporation pond is 1 gallon per <br />minute per acre, which is based on the operating experience of Rio Blanco <br />Shale Oil Corp. at 1"ract Ca. The pond will be a balanced cut and fill <br />construction. Earthen berms will be compacted to 95 percent maximum density <br />