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Record of Decision System (RODS)

CENTRAL ILLINOIS PUBLIC SERVICE CO.

Abstract

Site Name:  CENTRAL ILLINOIS PUBLIC SERVICE CO.
Address:  SOUTH WEBSTER STREET 
City & State:  TAYLORVILLE  IL  62568
County:  CHRISTIAN
 
EPA ID:  ILD981781065
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-92/219
ROD Date:  09/30/1992
Operable Unit(s):  01
 
Media:  Soil, Sediment, Debris, Groundwater
 
Contaminant:  VOCs, Other Organs
 
Abstract:  SITE HISTORY/DESCRIPTION: The 1-acre Central Illinois Public Service (CIPS) site is a former manufactured gas plant in Taylorville, Christian County, Illinois. Land use in the area is predominantly residential, with Manners Park, a multi-use recreational facility, located adjacent to the site. Seaman Estate pond, located south of the site, is used for fishing and swimming. Ground water beneath the site is no longer used as a drinking water source, and residences have been connected to a municipal water supply. The CIPS/Taylorville plant, constructed in 1892, was operated by CIPS from 1912 until 1932. The plant produced a low-quality gas from coal, which was used for lighting and heating. Coal tar, produced as a by-product, was typically disposed of offsite, sold, or given away to be usedfor various purposes. After higher quality natural gas became available in the area, the plant was closed. Onsite contamination by coal tar was discovered in 1985 during site construction. As a result of state investigations, an immediate removal action (IRA) was performed by CIPS in 1987 to remove all buried tanks, contaminated soil, and sediment at the site; to provide an alternative water supply to affected residences; and to implement institutional controls. This ROD addresses a final remedy for the remaining principal threat posed by ground water contamination at the site, and also documents the prior 1987 removal action. The primary contaminants of concern affecting the soil, sediment, debris, and ground water at the site are VOCs, including benzene, toluene, and xylenes; and other organics,including PAHs and phenols. PERFORMANCE STANDARDS OR GOALS: Chemical- specific ground water clean-up standards, which are based on state and federal drinking water criteria, include benzene 0.005 mg/l; toluene 1 mg/l; ethylbenzene 0.7 mg/l; xylenes 10 mg/l; anthracene 2.1 mg/l; benzo(a)pyrene 0.00023 mg/l; and 2-methylphenol 0.35 mg/l. In addition to meeting the individual ground water objectives indicated certain toxicity equations as defined in the ROD must be satisfied to protect against liver tumors and liver, kidney, and blood toxicity. INSTITUTIONAL CONTROLS: Institutional controls will be implemented in the form of land use and deed restrictions to further protect the public health and environment.
 
Remedy:  SELECTED REMEDIAL ACTION: The selected remedial action for this site includes documenting the previously implemented source control measures which included removal and offsite disposal of the structures associated with the original gas plant; excavation and offsite disposal of approximately 9,000 cubic yards of visibly contaminated soil down to the ground water table level and excavation and offsite disposal of 3,000 cubic yards of soil and sediment from the drainageway section leading to Seaman Estate pond; backfilling excavated areas with clean soil from offsite; plugging and abandoning private drinking water wells; and connecting affected residents to a public water supply. The selected remedial actions to be implemented now include extracting and neutralizing contaminated ground water prior to onsite treatment in a liquid phase carbon adsorption column, with onsite discharge of the treated water to the drainageway downgradient of Seaman Estate pond; transporting contaminated carbon offsite to a facility for regeneration or incineration; removing precipitated solids from the treatment process, and testing them for hazardous waste characteristics, prior to appropriate disposal; conducting long-term ground water and surface water monitoring; and implementing erosion controls, institutional controls, including deed and land use restrictions, and site access restrictions, including fencing. The estimated present worth cost for this remedial action is $9,346,034, which includes an annual O&M cost of $401,400 for 30 years.
 
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