mystery bridge rd/u.s. highway 20

U.S.HWY 20,28 & MYSTERY BR. RD

The Mystery Bridge site is located in Natrona County, northeast of Casper, Wyoming. A residential area comprises the majority of the site, and an industrial area where hazardous substances were used lies along the southern and western site boundary. The site is bordered to the north by the North Platte River and on the west by the former Little America Refining Company (LARCO) refinery, which is currently operated by Sinclair Refining under a RCRA permit. Mystery Bridge Road and the Brookhurst subdivision extend along much of the northern and eastern perimeters of the site. The site was listed on the National Priorities List (NPL) in 1990 after several removal actions and significant public input. The two responsible parties are Kinder Morgan Energy Partners, L.P. (KMI), which owned and operated a gas compression and transmission plant, and Dow Chemical Company/Dowell Schlumberger, Inc. (DOW/DSI), which operated an oil field services and truck washing facility, now closed. Two separate groundwater plumes previously emanated from the two facilities and flowed towards the Brookhurst subdivision and the North Platte River. The KMI facility was sold in 2012 and is now owned and operated by Tallgrass Energy Partners, LP.

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