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• Table D-1 EVAPORATION POND SPECIFICATIONS Safety Factors ~ In-Flow Evap. Surface Evap. Rate* Pond Volume** e Pond No. 1*** 0.4 gpm 1.5 acres 3.75 11.6 Pond No. 2*** 1.3 gpm 1.75 acres 1.35 4,2 Pond No. 3*** 1.3 gpm 1.75 acres 1.35 4.2 * Pond Evaporation 'iuface Area Safety Factor. Basis: 2 gallons per minute per acre annual average evaporation rate - ref: Rio Blance Shale Oil Corp. ** Pond Volume Safety Factor - years to fill pond assuming no evaporation. *** Normal pond free-hoard = 4.2 feet D.3.6 Processing Methodology Process heat is supplied by an 800-horsepower, natural gas fired boiler, Steam circulates through the heat exchangers and product dryer in a closed loop. Process electrical power is supplied by a pair of 400-kw natural gas fueled generators. The process flow sheet. shows streams going to the three evaporation ponds to allow separation of the wastes. The bleed-off water stream (Stream No. 47) flows to Pond No. 2 which subsequently overflows to Pond No. 3. Pond No. 1 receives boiler blowdown, cooling tower blowdown, and purge waters from the filtration and water treatment steps. Flows to Ponds No. 2 and 3 total 2.6 gallons per minute. Flows to Pond No. 1 totals 0.4 gallons per minute. All waste streams will flow to the evaporation ponds. Estimated quantities of solid material remaining in each pond, after two years of operation, are: Pond No. 1 - 33 tons (miscellaneous salts and insolubles) Pond No. 2 - 720 tons (nahcolite) Pond No. 3 - 620 tons (NaCI) When operation of the Pilot Plant ceases, the solid material remaining in Ponds No. 2 and 3 will be either sold or disposed of in an approved off-site landfill (depending on material purity). The material remaining in Pond No. • 1 (the pond receiving boiler and cooling tower blowdown and water treatment and filtration purge water) will be disposed of in an approved off-site landfill. D-5