- Oscoda, Au Sable Township (Iosco County)
- EPA ID# MID980794408
- NPL Factsheet
Community Involvement Coordinator
Cheryl Allen (firstname.lastname@example.org)
312-353-6196 or 800-621-8431, ext. 36196
Remedial Project Manager
(312) 886-5251 or
800-621-8431, ext. 65251
Michigan Department of Environmental Quality Project Manager
(517) 241-2120 or 800-662-9278
(where to view written records)
Robert J. Parks Public Library
6010 N. Skeel Avenue
Au Sable Township Hall
311 Fifth Street
Au Sable, Mich.
The 10-acre Hedblum Industries Superfund site is located in a mixed-use, industrial and residential area in Au Sable Township, Iosco County, Michigan. About 13,700 people live in the greater site area. The closest residence is about 350 feet from the site. An industrial park is located less than one mile north. Most of the Oscoda and Au Sable Township population lives within three miles of the site.
From 1958 through 1985, various auto parts manufacturers leased the site. From 1968 to 1972, one of the companies (Thompson Industries) dumped approximately 40 gallons of trichloroethylene (TCE) from a degreasing tank onto the ground every two weeks. The Michigan Department of Environmental Quality (MDEQ) estimated that 4,000 gallons of TCE were dumped over this four-year period.
Several residential wells in the Au Sable Heights subdivision had become contaminated with TCE. The city of Oscoda extended water mains into the Au Sable Heights subdivision to provide clean water to the subdivision. More sampling found an underground storage tank containing TCE and other solvents so the tank was removed.
EPA placed the site on the final National Priorities List (NPL) in September 1983 and issued a Record of Decision (ROD) in September 1989 to select a way to clean up the site. The selected remedy was to extract and treat contaminated groundwater beneath the Au Sable Heights subdivision and to sample contaminated soils on the site. Under a federal enforcement agreement, the Responding Party (RP) installed a system to treat groundwater in 1992. EPA and MDEQ have been working with the RP to sample and make sure the treatment system is removing the contamination.
In mid-2000, sampling at the Hedblum site showed that the remedy was not very effective. EPA issued an Explanation of Significant Differences and another federal enforcement agreement in 2009 requiring the RP to expand the remedy to clean up the groundwater more quickly. In April 2011, EPA approved the RP’s plan to add 23 new groundwater recirculation wells and three soil vapor extraction wells. In April 2012, Au Sable Township passed an ordinance preventing residents from installing or using private wells. Any private wells were plugged and abandoned.
The RP began constructing and installing the expanded groundwater cleanup system in July 2012, and the system began operating in November 2012. Data collected to date show that the system is removing groundwater contaminants at a faster rate and EPA is working with the RP make sure the system is working effectively.
The Hedblum Industries site is being addressed through RP actions under state and federal oversight.
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EPA has been working with the RP since December 2012 and minor adjustments to the system were made to maximize groundwater treatment. The EPA and MDEQ will continue to monitor the system and work with the RP to ensure it is operating effectively. EPA will complete a detailed five-year review at the Hedblum site by August 2014. This will be the fourth review conducted at the Site. EPA is also reviewing a Remedial Action Report that will provide details about the expanded groundwater treatment system and its effectiveness. The report is planned for completion in 2014.
EPA is conducting a five-year review of the Hedblum Industries Superfund site at 1000 Au Sable Road (Old U.S. 23), about one mile southwest of Oscoda. The Superfund law requires regular checkups of sites that have been, or are being cleaned up — with waste managed on-site — to make sure the cleanup continues to protect people and the environment. This is the fourth five-year review for the site.
- 1989 Record of Decision (PDF) (24pp, 53K)
- Hedblum Industries Five-Year Review (PDF) (125pp, 25MB) Sept. 2009