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Record of Decision System (RODS)

KOPPERS CO., INC. (TEXARKANA PLANT)

Abstract

Site Name:  KOPPERS CO., INC. (TEXARKANA PLANT)
Address:  WEST 3RD ST 
City & State:  TEXARKANA  TX  75501
County:  BOWIE
 
EPA ID:  TXD980623904
EPA Region:  06
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Amendment
ROD ID:  EPA/AMD/R06-92/068
ROD Date:  03/04/1992
Operable Unit(s):  01
 
Media:  Soil, Sediment, Debris, Groundwater
 
Contaminant:  VOCs, Other Organics, Metals
 
Abstract:  SITE HISTORY/DESCRIPTION: The 62-acre Koppers (Texarkana Plant) site is a former wood treatment facility located in Texarkana, Texas. The site consists of a 34-acre residential area and a 28-acre former sand and gravel operation. The entire site lies within a 100-year flood plain. From 1910 to 1961, the Koppers Company treated wood onsite using PCP, creosote, and metallic salts. After onsite operations ceased in 1961, the structures were removed and the property was sold for residential and industrial development. In 1964, Carver Terrace, Inc. developed the northern 34 acres of the site for residences. Kennedy Sand and Gravel Company owns the remaining southern 28 acres, which operated as a sand and gravel quarry from the late 1970s to 1984. In 1975, Mount Zion Missionary Baptist Church purchased a small portion of the site from Carver Terrace Inc. to construct a church. In 1980, an investigation conducted by both the state and the Koppers Company identified onsite soil and ground water contaminated with PCP, arsenic, and creosote. In 1985, EPA placed clean soil and sod on some ofthe yards in the subdivision as a protective measure to reduce exposure to contaminated soil. A 1988 ROD provided for onsite treatment of contaminated soil using soil washing and treating the ground water and non-aqueous phase liquids (NAPLs) using oil/water separation and carbon treatment. However, the remedial action was not initiated because of a Congressional mandate set forth in the Conference Report to the FY92 Appropriations Bill stipulating that EPA purchase homes located on the site and provide relocation assistance to the residents. This 1992 ROD amendment appends the provisions of the mandate to the remedy, as established in the 1988 ROD. The primary contaminants of concern, as provided in the 1988 ROD, affecting the soil, sediment, debris, and ground water are VOCs, including benzene, toluene, and xylenes; other organics, including PAHs and PCP; and metals, including arsenic. PERFORMANCE STANDARDS OR GOALS: Chemical-specific clean-up goals remain the same as those provided in the 1988 ROD. Soil clean-up goals include excavation to a 100 mg/kg action level of total carcinogenic PAHs based on a risk level between 10[-6] and 10[-4]. Ground water clean-up goals are not provided but were based on Best Available Treatment Requirements (BAT) for the Organic Chemical, Plastics, and Synthetic Fibers Industry. INSTITUTIONAL CONTROLS: Deed, land use, and zoning restrictions will be implemented to prevent future residential development of the site.
 
Remedy:  SELECTED REMEDIAL ACTION: The amended remedial action for this ROD includes implementing all treatment actions provided for in the 1988 ROD, which include onsite soil washing as well as treatment of ground water using an oil and water separator and granular activated carbon treatment purchasing onsite residences; permanently relocating affected residents; demolishing homes and removing and disposing of debris offsite; implementing institutional controls, including deed and land use restrictions; and reclassifying the property from residential to non-residential use. The estimated amended present worth cost for this remedial action is $12,400,000, which includes an annual O&M cost ranging from $316,200 to $329,200 for 30 years.
 
Text:  View full-text ROD [ 43K ]
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