2012-03-07_PERMIT FILE - C2010088A (17)

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2.04.3 General Requirements: Site Description and Land Use Information The land east of Reed Wash is currently unused and is a remnant of the former petroleum refinery operations to the east. The portion of the site west of Reed Wash is undeveloped. There are wetland areas west of Reed Wash. Industrial operations formerly occurred in the eastern part of the site, where several large impoundments were utilized as evaporation ponds and landfarm areas for refinery- generated waters and waste materials. There are several landfill areas at the site, where coke fines are buried, along with a 7 -acre closed landfill which contains solidified acid - sludge material. The acid - sludge waste cell is a mounded and soil- capped square area, about 7 acres in size, near the site's northeast corner. The waste cell contains approximately 85,000 cubic yards of solidified acid sludge. This area is subject to the post - closure operation and maintenance requirements specified in Colorado Department of Public Health and Environment's (CDPHE's) solid waste regulations, which primarily include erosion control of the landfill cap. The 39 -acre landfarm area consists of former evaporation ponds. This area received Closure Certification from CDPHE on August 25, 2005 for residential /unrestricted use (Exhibit 15). However, there are odor issues associated with this area and the surface soils appear to be sterile since they are completely devoid of vegetation. There are several areas in the northeast part of the site where coke particulate -matter was disposed in a series of excavated and unlined trenches. The material apparently originated from baghouses connected to the former boiler exhaust stacks. In 1985, it was reported that at least 10,000 cubic yards of cokefines were landfilled. The landfill appears to have a cap of native soils. Permit Application 2.04 -2 04/11