Congressional District # 08
SPRINGFIELD TOWNSHIP DUMPEPA ID# MID980499966
Last Updated: November, 2014
The four-acre Springfield Township Dump (Springfield) site is located on a 12-acre rural residential lot near Davisburg, Michigan. The site was used for unauthorized chemical waste disposal from about 1966 to 1968. There are about 25 homes within one mile of the site, with the nearest residence located about 800 feet away. All homes in the area are served by private drinking water wells.
U.S. EPA inspected placed the site on the National Priorities List in September 1983.
Site ResponsibilityThe Springfield site is being addressed through a combination of federal, state, and potentially responsible party (PRP) actions.
Threats and ContaminantsMDNR and U.S. EPA conducted a Remedial Investigation at the Springfield site from 1985-1989. Soil at the site was found to be contaminated with polychlorinated biphenyls (PCBs), heavy metals, and volatile organic compounds (VOCs), including toluene and xylene. Groundwater beneath the site was contaminated with VOCs, including toluene and trichloroethene. Some sludges contained PCBs and dieldrin, a pesticide. No drinking water wells had been impacted by groundwater contamination, however.
A risk assessment preformed to determine actual or potential human health risks posed by the site contaminants found that although no one was drinking contaminated water, a potential health threat was posed by the groundwater contaminated plume. Other potential health threats included inhalation of contaminated dust or vapor and ingestion of and/or contact with contaminated soil.
In July 1990, U.S. EPA completed and released for public review a Feasibility Study Report evaluating various soil and groundwater cleanup methods for the Springfield site. At the same time EPA released a Proposed Plan for cleanup of the soil and groundwater for public comment.
In September 1990, after evaluating public comments on the Proposed Plan, U.S. EPA issued a Record of Decsision (ROD) that detailed selected cleanup remedies for the soil and groundwater. Site cleanup method included fence repair and extension, excavation and onsite incineration of PCB- and VOC-laden surface soils, in-situ soil vapor extraction (ISVE) of VOC-laden subsurface soils, excavation and onsite solidification of metals-laden soils (and incinerator ash, as appropriate), and groundwater pump and treat.
In 1992, U.S. EPA issued an Administrative Order on Consent to the PRP group to begin the design of the ISVE system and the groundwater treatment system. In November 1993, U.S. EPA issued a minor modification to the ROD, called an Explanation of Significant Differences, to change the selected groundwater treatment method. U.S. EPA also issued a Unilateral Administrative Order to the PRP group in 1993 to install the groundwater cleanup system. The system consisted of a pumping well, a carbon adsorption unit to treat the water, and an injection well to return the treated water into the ground. The PRP group installed the groundwater cleanup system in 1994 and has been operating it since.
U.S. EPA signed a ROD amendment in June 1998 to change the way the PCB-laden soils would be cleaned up, from onsite incineration to one or more of the following treatment methods: 1) soil washing, 2) solvent extraction, or 3)low-temperature thermal desorption. Approximately 11,500 cubic yards of PCB-laden soils would need to be excavated and treated.
Beginning in Summer 1999, the PRPs excavated the PCB-laden surface soils and treated them using an on site soil washing system. Most of the treated soil achieved the treatment goals and were replaced onsite. Several batches did not achieve the cleanup goal and were either re-treated or disposed of in an offsite licensed facility. The PRPs treated or disposed of an estimated total 12,000 cubic yards of PCB-laden soils. A soil cover was then placed over the treated area and grass was planted.
The PRPs began installation of the ISVE equipment in May 2000. In addition, the PRPs decided to construct and operate an air sparging system to augment the groundwater pump and treat system in an effort to speed up the restoration of the groundwater at the site. The ISVE and air sparging equipment installation was completed in early August 2000 and the PRPs began operating the systems shortly thereafter. U.S. EPA conducted an inspection of the SVE and air sparging systems on August 22, 2000, and determined that the systems were operating as designed, thus the Springfield site remedial action qualifies as construction complete.
In October 2003 the PRPs submitted a supplemental remedial action workplan outlining a proposal to use in-situ chemical oxidation (ISCO) to accelerate the breakdown of VOCs in the groundwater. ISCO has emerged as a cost-effective and viable remediation technology for the treatment of VOCs in groundwater, soils, and sediments. Complete decomposition to carbon dioxide and water is the desired endpoint of an ISCO process. The ISCO process was completed in 2005.
The most recent Five-Year Review (FYR) for the Springfield Site was completed in September 2014. The FYR report concluded that the Springfield Site remedy currently protects human health and the environment in the short-term. The primary contaminant of concern remaining on-site above Remedial Action Standards (RASs) is trichloroethylene (TCE), and EPA is currently negotiating with signatories to the 1998 Consent Decree (CD) to optimize remedial measures and accelerate the removal of residual contamination. To ensure protectiveness in the long-term residual contamination must be accurately delineated and the adequacy of contaminant capture must be confirmed. In addition, groundwater extraction and treatment (or an equivalent remedial measure) and environmental monitoring must continue until remedial standards are attained, and a new restrictive covenant should be finalized and recorded.
ContactsRemedial Project Manager, U.S. EPA
william ryan (firstname.lastname@example.org)
Community Involvement Coordinator, U.S. EPA
AliasesOAKLAND COUNTY LDFL