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Record of Decision System (RODS)



Address:  33RD AND DAHLIA 
City & State:  COMMERCE CITY  CO  80022
County:  ADAMS
EPA ID:  COD980717953
EPA Region:  08
NPL Status:  Deleted from the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R08-93/071
ROD Date:  06/30/1993
Operable Unit(s):  02
Media:  None
Contaminant:  None
Abstract:  The Sand Creek Industrial (Operable Unit 2) site is part of the 550-acre Sand Creek Industrial site located within the Sand Creek floodplain in Commerce City, Colorado. The site surface is composed principally of alluvial materials and imported fill, which covers the area so that natural features are difficult to discern. Surficial fill materials at the site consist of clay, silt, sand, gravel, and debris including brick, concrete, glass, metal, plastic, trash, and wood. Land use in the area is predominantly industrial and agricultural. An estimated 25 residents live within a one-mile radius of the site. Municipal water is supplied to the metropolitan area surrounding the site through ground water and surface water from alluvial and bedrock wells and outside sources. Four suspected contaminant source areas were identified at the Sand Creek Industrial site: the Oriental Refinery, the Colorado Organic Chemical facility, the 48th and Holly Landfill, and the L.C. Corporation property. Each source area was designated as an OU for remediation. From 1948 to 1958 the L.C.Corporation operated onsite, when impoundments were constructed on the property and later enlarged. A gravel pit and drainage ditch that discharged to Sand Creek were excavated, and large areas were cleared and buildings were constructed. In 1968, L.C. Corporation began disposing of spent sulfuric acid adjacent to the site, and it was to line its disposal pits with an ethylene propylene copolymer film before disposing of any acid. Some type of liner was installed; however, its composition could not be determined because of the disintegrated condition of the liner. The liner was breached and repaired after approximately 7,810 tons of sulfuric acid was disposed of in the L.C. Corporation pits. In 1974, the State investigated the property in response to a complaint involving severe chemical burns to livestock that had strayed onto the property, and as a result, found pools of liquid in lined pits onsite. L.C. Corporation agreed to clean up the liquid after an analysis showed it was a sulfuric acid solution that exceeded acceptable contamination levels. In 1975, State employees discovered a seep discharging extremely acidic liquid to Sand Creek. As a result in 1976, the State issued an emergency cease and desist and cleanup order against L.C. Corporation. In 1980, after several years of investigations and negotiations, L.C. Corporation undertook cleanup at the site. A 1acre area was excavated to a depth of 15 to 20 feet, neutralized with lime, and covered with soil. Due to the complex nature of the site, EPA has divided it into six operable units in order to more effectively address specific contamination problems. A 1989 ROD addressed contaminated soil, buildings, and tanks, as OU1, and a 1990 ROD addressed contaminated soil at the Colorado Organic Chemical facility. In 1988, site-wide RI identified several contaminants on the L.C. Corporation property, but sources and the extent of contamination were not defined because of the limited number of samples taken. Furthermore, duplicate samples frequently did notverify the presence of contaminants. In 1990 and 1991, additional soil samples were collected, which identified contamination including VOCs, metals, insecticides, and herbicides. Because these chemicals occurred at low concentrations, it was determined that the site poses no unacceptable risks to human health and the environment; therefore, there are no contaminants of concern affecting this site. SELECTED REMEDIAL ACTION: The selected remedial action for this site is no further action because prior cleanup activities were adequate to protect human health and the environment. There are no present worth or O&M costs associated with this no action remedy. PERFORMANCE STANDARDS OR GOALS: Not applicable. INSTITUTIONAL CONTROLS: Not applicable.
Remedy:  As a result of prior cleanup activity on the OU2 property there is no significant risk to the public health by ingestion, inhalation, or skin absorption. The former neutralization of the acid pits does not need augmentation or additional activity. No further action is therefore recommended for OU2.
Text:  View full-text ROD [ 21K ]
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