2017-13679: National Oil and Hazardous Substances Pollution Contingency Plan National Priorities List: Partial Deletion of the Mystery Bridge Road/U.S. Highway 20 Superfund Site
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The Environmental Protection Agency (EPA) Region 8 is issuing a notice of Intent to Partially Delete the property currently owned by Tallgrass Energy Partners, LP (formerly owned by KM Upstream LLC and hereinafter referred to as the former KMI Property), on the Mystery Bridge Road/U.S. Highway 20 Site (Site) from the National Priorities List (NPL). The Site is located in Natrona County, northeast of Casper, Wyoming. EPA requests public comment on this proposed action. The NPL, promulgated pursuant to section 105 of the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) of 1980, as amended, is an appendix of the National Oil and Hazardous Substances Pollution and Contingency Plan (NCP). The EPA and the State of Wyoming, through the Wyoming Department of Environmental Quality (WDEQ), have determined that all appropriate response actions, other than maintenance of institutional controls and five-year reviews, have been completed for the former KMI source area and the resultant groundwater contamination. However, this deletion does not preclude future actions under Superfund. This partial deletion pertains to the former KMI Property of OU1 and OU2 formerly containing the benzene, toluene, ethylbenzene, and total xylenes (collectively known as BTEX) groundwater plume and source soils, respectively. The remaining area and media of both OU1 and OU2 containing the volatile halogenated organic chemicals (VHOs) source soils and plume, which are attributable to the Dow Chemical Company/Dowell Schlumberger, Inc. (DOW/DSI) facility, will remain on the NPL and are not being considered for deletion as part of this action. A map and the description of the surveyed boundaries of the former KMI Property are included in the docket and at the information repositories listed below.
The agency’s own summary, as published.
What this changes
Amends 1 part of the Code of Federal Regulations — the standing rules this notice rewrites.
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