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Denver map pinpointing the restoration area.
Background: The S.W. Shattuck Chemical Company, Inc. (Shattuck site) is Operable Unit 8 of the Denver Radium Superfund site, and is located in southwest Denver within the South Platte River Basin. The site consists of 5.9 acres of land formerly owned by the S.W. shattuck Chemical Company, a 4.3 acre railroad right-of-way just west ofthe Shattuck property, and nearby "vicinity" properites bounded by South Broadway Street, South Santa Fe Drive, Evans Avenue, and Iowa Avenue.
The Shattuck site is located within the drainage of the South Platte River, which flows approximately 3,000 feet west of the site. A shallow unconfined aquifer exists beneath the site and is perched on bedrock and merges with the alluvial aquifer beneath the floodplain of the South Platte River.
Goundwater in the area of the site generally flows west across the site and then northwest toward the South Platte River. Several contaminants including uranium, gross alpha and beta radioactivity, arsenic, cadmium, selenium, molybdenum, other metals, and some organic chemicals were documented in groundwater of the shallow unconfined aquifer beneath the Shattuck site. Some of these contaminants were shown to have infiltrated s storm sewer adjacent to and down-gradient from the site, raising concerns that contaminants discharged from the storm sewer outfall had impacted the South Platte River and its natural resources
The South Platte River provides habitat that supports a variety of migratory birds. Seasonal surveys conducted by the Fish and Wildlife Service (Service) and the Denver Chapter of the audubon Society along the urban reach of the South Platte River identified more than 30 species of migratory birds including waterfowl, shorebirds, and songbirds.