The Tri-State district includes the Superfund site in what Oklahoma cities?
Picher and Cardin
Tri-State district
The Tri-State district was an historic lead-zinc mining district located in southwest Missouri, southeast Kansas and northeast Oklahoma.
 The district produced lead and zinc for over 100 years.
 Production began in the 1850s and 1860s in the Joplin - Granby area of Jasper and Newton counties of southwest Missouri and continued until the closure of the Picher, Oklahoma mines in 1967.
 The tri-state district includes three mining-related Superfund sites: the Tar Creek Superfund site in Oklahoma, and two others in Missouri and Kansas.
Tar Creek Superfund site
Tar Creek Superfund site is a United States Superfund site, declared 1983, located in the cities of Picher and Cardin, Northeastern Oklahoma.
 From 1900 to the 1960’s lead mining  and zinc mining companies left open Chat piles behind until the present day.
 The dust has blown around the city containing these metals, cadmium, and others.
 The metals have also seeped into groundwater, ponds, and lakes, many of which still are used by children for swimming.
 Elevated lead, zinc and manganese levels in Picher children have led to learning disabilities and other problems.
 The EPA declared Picher to be one of the most toxic areas in the United States.
Imperial Oil (Superfund site)
Imperial Oil is a current Superfund site located off Orchard Place near Route 79 in Morganville, Marlboro Township, Monmouth County, New Jersey.
 This site is one of 114 Superfund sites in New Jersey.
 It is in the U.S. Environmental Protection Agency (EPA) Region 2 Superfund area of control and organization.
 The 15 acre Imperial Oil Co./Champion Chemicals site consisted of six production, storage, and maintenance buildings and 56 above-ground storage tanks. List of Superfund sites in Nevada
This is a list of Superfund sites in Nevada designated under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) environmental law.
 The CERCLA federal law of 1980 authorized the United States Environmental Protection Agency (EPA) to create a list of polluted locations requiring a long-term response to clean up hazardous material contaminations.
 These locations are known as Superfund sites, and are placed on the National Priorities List (NPL).
 The NPL guides the EPA in "determining which sites warrant further investigation" for environmental remediation.
 As of November 29, 2010, there was one Superfund site on the National Priorities List in Nevada, with no further sites proposed for addition.
 No site has yet been removed from the list. Limestone Road
The Limestone Road Superfund Site is a Superfund site located in Cumberland, Maryland on land on both sides of Limestone Road.
 "The Site is located in the Valley and Ridge physiographic province of the Koppers Co., Inc. (KCI) Superfund Site
The Koppers Co., Inc. (KCI) Superfund Site is one of three Superfund sites in Oroville, California, along with Louisiana Pacific Sawmill and Western Pacific Railyard.
 The KCI Superfund Site is a 200-acre site which served as a wood treatment plant for 50 years.
 Wood was treated with many chemicals to prevent wood deterioration.
 The accumulation of these chemicals from spills, fires, and uses has caused this site to be contaminated with hazardous waste material.
 Due to soil and groundwater contamination, the site was placed on the National Priorities List in 1984 for remedial action plans to clean up the site to protect surrounding residential areas concerning environmental and human health risks. Ashland/Northern States Power Lakefront
The Ashland/Northern States Power Lakefront Superfund site is a contaminated region of the Wisconsin shoreline of Lake Superior that is being studied for remediation by Northern States Power Wisconsin (NSPW), as well as the Environmental Protection Agency (EPA), the Wisconsin Department of Natural Resources (WDNR).
 This site has held a manufactured gas plant from 1845 to 1947, as well as lumber manufacturing and treatment mills for four decades at the start of the 20th century, railcar loading facilities, and a municipal landfill.
 Additionally, a wastewater treatment plant is located on the premises, but is not in operation.
 Contamination of the site is currently believed to have been caused by all the parties mentioned above, or former owners of the property whose companies are no longer in business.
 The area is listed as a Superfund site by the EPA under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).
 Releases of hazardous substances occurred onshore and migrated into sediment in Chequamagon Bay on Lake Superior. T.H. Agriculture &amp; Nutrition Co.
T.H. Agriculture & Nutrition Company (THAN) was a California chemical company.
 It operated a pesticide-formulating facility from 1962 until 1981 that is now a Superfund site.
 Other companies formulated pesticides on the site from 1950 to 1962.
 During the 1950s and 1960s, on-site landfills were used for disposal of wastes generated from site operations, including pesticides from cleaning equipment.
 Waste was spilled on the surface of the site and left in piles on the ground.
 Sampling at the site conducted by the California Department of Health Services (CDHS) detected pesticides in soil and groundwater.
 The site was listed on the Superfund National Priorities List in 1986.
 Cleanup activities at the site were completed in 2003 and included soil vapor extraction; demolition and removal of various structures; excavation and management of impacted soils; construction of a low-permeability containment cover to minimize the potential for movement of residual chemicals from Site soils to other media; implementation of access controls and land use restrictions; demonstration and maintenance of appropriate financial assurances; monitored natural attenuation of groundwater; provision of as-needed alternative drinking water supplies; and performance of ongoing operation, maintenance, and monitoring activities.
 Approximately 30,000 people live within 3 miles of the site, with the closest resident being 500 feet from the site.
 Approximately 35,000 people depend on groundwater as a source of drinking water. Del Amo (Superfund site)
The Del Amo Superfund Site is a U.S. EPA Region 9 Superfund Site.
 It is one of 94 Superfund Sites in California as of November 29, 2010. Brio Superfund site
The Brio Superfund site is a former industrial location in Harris County, Texas at the intersection of Beamer Road and Dixie Farm Road, about 16 mi southeast of downtown Houston, and adjacent to the Dixie Oil Processors Superfund site.
 It is a federal Superfund site, although it was deleted from the National Priorities List in December 2006.
 A neighboring residential subdivision called South Bend, now abandoned, was located along and north of the northern boundary of Brio North.
 The former South Bend neighborhood consisted of about 670 homes, an elementary school, and a Little League baseball field.
 Documents pertaining to the Brio Superfund site are located at the San Jacinto College South Campus Library, which houses Brio Site Repository Documents, U.S. Environmental Protection Agency (EPA) Administrative Records, and documents concerning the adjoining Dixie Oil Processors site.