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AUS OU - Additional and Uncharacterized Sites Operable Unit

DOI formed the AUS OU  from 1997 to 1999 to address potential releases of hazardous substances not included in existing OUs at the Refuge.   The AUS OU sites are spread throughout the former Illinois Ordnance Plant area and include former manufacturing facilities, industrial storage areas, and disposal areas.  The Preliminary Assessment/Site Inspection (PA/SI) revealed elevated levels of heavy metals and pesticides in soils and concentrations of solvents, including trichloroethylene (TCE), exceeding groundwater regulatory standards.  Thirty-two sites are recommended for remedial investigation. An Administrative Order on Consent (AOC) was entered into with General Dynamics Ordnance & Tactical Systems (GDO&TS) for performance of the RI/FS at the AUS OU with USFWS conducting the baseline risk assessment.  The Remedial Investigation/Feasibility Study (RI/FS) will further define the nature and extent of contamination.

AUS OU Overview Map (730 KB PDF file)


The following documents can be found at:

Southern Illinois University        (618) 453-2818

McLafferty Annex

1830 University Press Drive

Carbondale, Illinois 62901

Hours:  Monday - Friday 9:00 a.m. - 5:00 p.m.


U.S. Fish & Wildlife Service     (618) 997-3344

Crab Orchard National Wildlife Refuge

6987 Headquarters Road

Marion, Illinois 62959

Hours:  Monday - Friday 8:00 a.m. - 4:00 p.m.

The following are downloadable documents in Adobe Acrobat format.

2003 AUS Administrative Order on Consent for Remedial Investigation/Feasibility Study


2006 AUS Final Remedial Investigation/Feasibiltiy Study Work Plan


Quality Assurance Project Plan Addendum


2003 Final Preliminary Assessment/Site Inspection Report


2003 Area 7


2006 Five Year Review (4.3 MB PDF file)


2006 Investigation of AUS OU Factsheet (123 KB PDF file)




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Crab Orchard National Wildlife Refuge

8588 Rt. 148
Marion, IL 62959

Phone:  (618) 997-5491  

Email:  CrabOrchardCleanup@fws.gov


Last Updated:  August 6, 2007