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• 6.3.4 Waste Disposal <br />Common domestic solid waste is collected in containers and periodically transported to an <br />approved landfill. Sewage from the plant is directed to a septic system with drain field. Sewage <br />from temporary port-a-potties is collected and hauled to an off site disposal system. In 2000, <br />two barrels of lab reagent waste and two barrels of waste oil were shipped to an approved off <br />site facility for treatment and disposal. Lab waste was considered hazardous waste because of <br />chromium and silver content greater than EPA limits. Three five gallon containers of old <br />chemicals were also shipped to an approved off site facility. Process wastewater including <br />boiler blowdown, plant washdown, and contaminated precipitation runoff was directed to the <br />process pond. A pump in the process pond allows WRN to recycle the water to the barren <br />system. As a result of excess process water in November 2000, 47,040 gallons of process <br />• water containing 25.5 tons of sodium bicarbonate was shipped to an approved off site disposal <br />facility. Royalties were paid on the 25.5 tons of product. The wastewater pond stores water <br />from cooling tower blowdown, water softener brine, and blowdown from the water heaters. <br />6.3.5 Water DischargelErosion Control <br />The WRN nahcolite solution mine has been designed as a zero discharge facility in regard to <br />wastewater. Containment structures are designed and constructed to contain the runoff <br />expected from a 25-year precipitation event. Disturbed areas associated with access roads, the <br />well field and plant site are reclaimed as soon as practical following disturbance. Semi annual <br />WRN inspections/clean-up were preformed and annual report submitted to CDPHE WQCD. <br />. 91 <br />