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The U.S. Environmental Protection Agency (USEPA) requested that the Illinois Department of Public Health evaluate data for public health implications at the Old LaSalle Dump site. The Old LaSalle Dump is an inactive site in the annual flood plain of the Illinois River in LaSalle, Illinois. The site is approximately six acres in size and is bordered on the north, south, and west sides by Huse Lake, a backwater lake of the Illinois River (Attachment 1). U.S. Highway 351 and wetlands lie east of the site. To the north is the Illinois and Michigan Canal. The city of LaSalle is about 1,000 feet north of the site on the bluff of the Illinois River. Before the site was used as a dump, it was a wetland.

The city of LaSalle operated the site and used it as a general refuse disposal area for the city from the early 1930s to approximately 1966. While in operation, a variety of residential and industrial wastes were deposited at the site. LaSalle's Electrical Utility Company (EUC) reportedly disposed rejected capacitors containing polychlorinated biphenyl (PCB) oil, cleaning solvents, and contaminated barrels. EUC reportedly shipped one to two truck tandem loads (10 cubic yards per tandem) of waste to the site at least once per week in the early to mid-1960s. The city of LaSalle closed the dump in 1966 and then allowed people to dump clean fill, including bricks, concrete slabs, wood, and a variety of other construction-type wastes, at the site. The fill material formed a highly permeable cap over the dump. Since the time of closure, the site has become well vegetated with grasses and trees over most of the area of previous deposition.

In June 1989, the site was placed on the Comprehensive Environmental Response, Compensation and Liability Act Information System (CERCLIS) list because of a discovery action initiated by the Illinois Environmental Protection Agency (IEPA). IEPA was responding to complaints from the residents of LaSalle concerning previous waste disposal practices.

On April 8, 1992, IEPA conducted an initial CERCLA Screening Site Inspection (SSI). IEPA observed several corroded and broken capacitors at the surface and protruding from the soil at the northern end of the site. IEPA collected soil and sediment samples during the SSI on May 6, 1992.

Two investigations conducted under the direction of USEPA followed the SSI. On November 9, 1995, under the Superfund Accelerated Cleanup Model (SACM) program, samples of surface water, surface soil, and sediment were collected. Groundwater samples were not collected due to an equipment malfunction. One year later, on November 21, 1996, USEPA and Superfund Technical Assessment and Response Team (START) members conducted soil and groundwater sampling.

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