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Record of Decision System (RODS)



Address:  4200 S GUN CLUB RD 
City & State:  AURORA  CO  80018
EPA ID:  COD980499248
EPA Region:  08
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R08-94/087
ROD Date:  03/10/1994
Operable Unit(s):  00
Media:  soil, groundwater
Contaminant:  VOCs, various landfill wastes
Abstract:  Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It is not the officially approved abstract drafted by the EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.

The Lowry Landfill Superfund Site is located in Township 5 South, Colorado. From 1940 until 1962, the U.S. Air Force used the site as a bombing range. In 1962, the site was declared a surplus property by the Federal government and was reclaimed by the city of Denver. Soon after reclamation, the city began preparations to utilize the site as a landfill. The landfill began operation in 1966, and accepted liquid and solid municipal wastes as well as over 8 million used tires. From 1966 to until the landfill's closure in 1980, approximately 138 million gallons of waste were disposed of at the site, primarily through a disposal practice known as "co-disposal." Approximately 75 unlined waste pits or trenches were excavated to accommodate the incoming flow of liquids, industrial wastes, and municipal waste. No measures are known to have been implemented to prevent leakage. Consequently, over time, the liquid seeped out of the pits and mixed with the surrounding refuse and groundwater. The total volume of liquid wastes disposed of at the landfill is estimated to be 138 million gallons. The types of wastes disposed of at the Lowry Site until the site closed in 1980, included: acid and alkaline sludge, asbestos, caustic liquid and solids, brines, plating wastes and other water-based sludge, laboratory wastes, organics, petroleum based oils, grease, chlorinated solvents, waste solvents, chemicals and oil, biomedical wastes, low-level radioactive medical wastes, pesticides and garden chemicals, water-soluble chemicals, paint and varnish waste, sludge and thinners, photographic chemicals and industrial solvents, construction waste, municipal refuse, household hazardous waste, appliance, tires, livestock carcasses and metallic wastes.

In 1989, EPA's Emergency Response Branch initiated a drum removal action. In conjunction with this removal action, EPA constructed two temporary lined storage pads to contain the drums and to manage the liquids. In 1990, EPA conducted Phase II of the Drum Removal Action in cooperation with Denver. This removal action involved: bulking the less contaminated wastes and treating them in the ground-water treatment plant; re-packaging the highly contaminated liquids and solids from the old drums; decontaminating and disposing the empty drums; and decommissioning the temporary drum storage pad.

In May of 1988, EPA issued general notice letters to the 195 companies believed to have generated, treated, stored or disposed of hazardous waste at the Lowry Site. In June of 1988, EPA issued a Special Notice to 28 PRPs to perform the OU 1 RI/FS.
Remedy:  The remedial action selected for this site is made up of 13 different components. The first component is to continue to operate the existing groundwater barrier wall. The second component is to install a groundwater extraction system at the foot of the landfill mass. The third component is to construct and operate both underground barrier walls and groundwater collection systems on the east and west sides of the Lowry Site. The fourth component is to install a groundwater monitoring program on-site. The fifth component is to construct and operate a groundwater containment, collection and diversion system along the southern perimeter of the Lowry Site. Annual treatment of approximately 6.4 million gallons of contaminated groundwater gathered by the collection system. The sixth component is to implement a long-term site-wide groundwater monitoring program to assess remedy compliance for the shallow ground-water system. The seventh component is excavate, remove, and treat surface and subsurface drums, contaminated soils and waste pits. The eighth component is to establish a landfill gas collection using interior and perimeter collection system. The ninth component is to install a perimeter gas monitoring system to detect potential landfill gas migration. If migration of landfill gases is detected, additional extraction wells will be emplaced. The tenth component is to place an additional two (2) feet of cover on the north face of the landfill mass. The eleventh component is to provide for the continued maintenance of the landfill mass cover. The twelfth component is to mitigate loss of wetlands areas from SWRA construction activities within unnamed creek. The final component is to implement institutional controls to limit access to the Lowry Site.
Text:  View full-text ROD [ 728K ]
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