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[ndustnal Wastewater Inspection Report Powderhorn Coal Company, Permit ~ CO-0027Id6, Mesa County April 19, 2001. Page 3 of 6 Comments: More emergency response supplies (oil absorbent and socks) should be obtained. The process to remove unneeded materials (waste oil, solvents, grease, fuels, batteries, etc.) from the materials containment building needs to be started. While materials are being removed, steps must be taken to assure that spills will not enter the storm-drain Dear the building's unloading doorway. The storm-draio terminates into ane of the detention ponds that may not be capable ofadequate containment or treatment of spilled materials. Describe the wastewater treatment processes: Wastewater from the mine de-watering is measured and directly discharged into the Colorado River. The mine de-wateriug wastewater meets discharge permit limits directly out of the mine and does not need treatment. Storm water runoff from the spoil piles is treated in a series of settling ponds to remove suspended solids. The ponds discharge into Coal Creek and the Colorado River. No chemicals are used for treatment. SECTION D: OPERATION/MAINTENANCE: 9. Evaluate the treatment facility. Include in this evaluation a discussion of any operation and maintenance problems: The wastewater treatment was properly managed and operated during the inspection. Prior to completing closure of the sanitary lagoons, the dried bio-solids (sludge) must be removed to an approved disposal site or evaluated by a Registered Colorado Professional Engineer with Division concurrence to bury the solids on site. The Division must be notified prior to removal or burial. 10. Haw are solid wastes disposed? Could this disposal practice affect water quality, including groundwater? Please describe in detail. The mine operation is inactive and will remain that wav. When active, the solid waste (trash and garbage) was properly contained and hauled to the sanitary landfill.