The Forest Glen Mobile Home Subdivision Site consists of 39 acres located in the City of Niagara Falls, Niagara County, New York. The Site includes a currently vacant residential subdivision of about 8.5 acres in size with 51 mobile and two permanent residences, 2.2 acres of undeveloped upland, and 28.3 acres of forested, shrub-scrub, and emergent wetland. East Gill Creek flows across the Site, dividing it into a northern portion (18 acres) and a southern portion (21 acres). East Gill Creek flows into Gill Creek, which in turn, flows into Hyde Park Lake. The outlet of Hyde Park Lake flows to the Niagara River. The Niagara River is located approximately 4 miles downstream of the Site.

In 1958, the Site was a forested wetland divided by East Gill Creek. During the early 1960s, the area was partially cleared and East Gill Creek was relocated about 400 feet to the north to form the northern boundary of the future subdivision. Industrial wastes were disposed at the Site from the early 1950s through the early 1970s, with the
northern portion of the Site used as a landfill for these waste materials. In 1973, the Site was purchased by Niagara Falls USA Campsites Corporation for subsequent
development into a mobile home subdivision known as the Forest Glen Subdivision. Evidence of waste disposal activities was discovered in 1973 during the installation of
utility lines. At that time, workers discovered resinous and powder-like wastes, drums, and battery casing parts. It is believed that regrading of the Site into mobile home lots re-distributed waste materials that were originally placed in low-lying areas of the Site.

The U.S. Environmental Protection Agency (USEPA) conducted an initial investigation of the Site in 1987, at the request of the Niagara County Health Department and New York State Department of Environmental Conservation (NYSDEC). Sampling indicated the presence of volatile organic compounds, semi-volatile organic compounds, and metals in on-site soils. Additional site investigation was performed in 1988 and 1989. Contaminants detected in on-site soils and sediments and sediments from East Gill Creek included high concentrations of organic compounds such as benzothiazole, 2(3H)benzothiazole, 2(3H)benzothiazolethione, aniline, phenothiazine, perylene, diphenylamine, 2-mercaptan-zothiazole, benzo(a)pyrene, chrysene, benzo(a)anthracene, phenol, benzo(k)fluoranthene, and polychlorinated biphenyls (PCBs). Inorganic substances, including aluminum, arsenic, cadmium, chromium, copper, iron, lead, zinc, and mercury, were also found in surface soil and sediment.

East Gill Creek receives stormwater from the site and surface soil contaminants have reached the creek. Groundwater flow is generally toward the west. Groundwater is contaminated with volatile organic compounds and inorganic substances. The extent of downstream contamination in East Gill Creek, Hyde Park Lake, Gill Creek, and the Niagara River have not been fully assessed, although sampling in East Gill Creek indicated that off-site transport of contaminants had occurred.