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Planning commission forwards Midstream Energy Partners' permit for two 90,000‑gallon LPG tanks to county commissioners
Summary
The commission unanimously recommended a due-pass to the Natrona County Commissioners for CUP26-01, allowing Midstream Energy Partners to place two 90,000‑gallon LPG tanks at its Casper terminal after staff and County Fire found the application met conditional-use criteria and applicants described multiple safety, permitting and oversight measures.
The Natrona County Planning and Zoning Commission voted unanimously to forward a due-pass recommendation for conditional use permit CUP26-01, allowing Midstream Energy Partners to install two 90,000‑gallon liquefied petroleum gas (LPG) storage tanks at 6730 North Six Mile Road in the heavy industrial zoning district.
Staff explained the conditional use permit is required because the proposed single-parcel storage capacity exceeds 12,000 gallons under the county’s 2022 zoning resolution (Chapter 4, §4.08.11, Storage of flammable or combustible liquids). Planning staff said county reviewers — including County Fire and County Road and Bridge — found no objection to the location in a heavy industrial area; the County Fire District provided a fire safety analysis included in the packet and staff noted that other agencies (WDEQ, EPA, OSHA) also have regulatory oversight.
Midstream representatives Ross Susk (assistant manager) and terminal manager Colin Mcfitus described the tanks as relocated equipment from an earlier Shosonyi operation to be used for butane blending into Midstream’s existing pipeline system. They said the operation will be a closed-loop transfer: butane will be delivered by rail, temporarily loaded into trucks, pumped into the 90,000‑gallon tanks and injected into the pipeline at about a 4% rate. The applicants emphasized multiple safety measures, including third‑party engineering review (Fortress Engineering), review by a local Wyoming engineer, a fire safety analysis, air‑quality permitting with WDEQ, implementation of a Process Safety Management (PSM) program overseen by OSHA, an EPA Risk Management Plan (RMP) and equipment safeguards such as pressure safety valves, flame and gas detection, and breakaway connections.
Applicants said the nearest residence is approximately 3,200 feet from the tanks and that hydrants are available that can deliver 1,500 gallons per minute; they also said the site already hosts large crude storage tanks. Commissioners asked why two 90,000‑gallon tanks were proposed; Midstream said the tanks are existing assets from Shosonyi and that one serves as a working tank while the second provides backup capacity.
No public opposition was presented. A commissioner moved to approve CUP26-01 with staff findings incorporated by reference, and the motion carried unanimously. The commission’s recommendation is advisory and will be considered by the Natrona County Commissioners at a later public hearing.
Next steps noted in the meeting: applicants must complete any required state and federal permitting (WDEQ, EPA), finalize engineering reviews and maintain coordination with County Fire and county staff before operations commence.
