[PLEASE NOTE: The information presented below is offered for educational purposes only.]
This site is not a Federal Facility.
The Cabot/Koppers Superfund Site located in Alachua County, Florida covers 170 acres bridging two properties. The Koppers site, currently operated by Koppers Industries, Inc., located on 90 acres of the western portion of the site, has been an active plant since 1916. The Koppers site has been used primarily to preserve wood utility poles and timbers by using three different chemical solutions: creosote, pentachlorophenol and chromated copper arsenate. Cabot Carbon formerly operated on the eastern portion of the site, on its own 49 acres, as a pine tar and charcoal generation facility making naval stores and charcoal from pine. Because of poor waste handling practices in the past, groundwater in the vicinity of the site is contaminated with arsenic, polycyclic aromatic hydrocarbons, and creosote compounds. The sediment and leachate in Hogtown Creek also are contaminated with creosote products such as naphthalene and phenol. Soil on the site is also contaminated with several organic compounds, including dioxin. Approximately 2,000 people live within a ½-mile radius of the site, and there are 11 schools within a 1-mile radius of the site.
Cleanup Progress: Actual Construction Underway
The ROD for the site was signed in 1990. In 1991, Cabot Carbon signed a Consent Decree to perform the cleanup on the former Cabot plant property and to repay its share of past costs. Koppers Industries and Beazer East refused to sign a Consent Decree, but in March 1991 agreed to perform the cleanup on their property under a Unilateral Administrative Order. Remedial activities specified in the ROD for the Cabot site have been implemented. However, the majority of the remedial plan specified in the ROD for the Koppers site has not been implemented because the measures were later determined to be inadequate to meet remedial requirements.
In 1985, an initial surface water interceptor system was installed on the Cabot Carbon property to intercept phenol-contaminated surface water from entering the Main Street ditch, thereby preventing it from contaminating downgradient streams. In 1994, contaminated sediments were excavated from the Northeast Lagoon. In June 1995, Cabot Carbon completed construction of the final trench that intercepts contaminated groundwater from the shallow aquifer and discharges it to GRU. The previous industrial operations on the Cabot Carbon property have been discontinued, and the site has been redeveloped. The area currently contains a commercial shopping mall, car dealership, and a series of smaller stores and businesses.
Construction of the pump/treat system for surficial aquifer groundwater at the Koppers Industries property began in February 1994, and operation began in August 1995. To date, no other remedial measures have been implemented at the Koppers site to accomplish remediation of the site. Removal of contaminated soils on the Koppers property was delayed; treatability studies showed that the selected remedy could not reach the soil cleanup criteria specified in the ROD. Further investigation of the site revealed sources of Dense Non-Aqueous Phase Liquids (DNAPLs) and dioxin contaminated soils within the Koppers Industries property. During the 1990's, following additional site characterization, several feasibility study supplements and amendments were prepared, the last of which was completed by EPA. In 2001, a draft proposed plan for a containment remedy, consisting of an impermeable cap and underground slurry wall, was opposed by local geologists due to concerns that the underlying clay is not an impermeable confining layer and will not prevent deeper migration of contaminants. Starting in 2002, installation of monitoring wells in the intermediate aquifer (Hawthorn Group) began and later, monitoring wells were installed in the drinking water aquifer (Floridan aquifer).
Creosote DNAPLs have been detected in the intermediate aquifer (Hawthorn Group) over a large area and have been found as deep as 120 feet below ground surface. Limited data in deeper zones of the aquifer system indicate that DNAPL waste has sunk to the top of, and possibly into, the Floridan aquifer. In an effort to ascertain the impact to the Floridan aquifer, several versions of a draft Addendum to the Floridan Aquifer Monitoring Plan were prepared in 2005, including a July 2005 “Revised Floridan Monitoring Plan Addendum” prepared by EPA. Beazer agreed to implement EPA's plan in August 2005.
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