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Comment period

Moses Lake Port Pumphouse 1 cleanup site

Draft legal agreement and public participation plan

Nov. 6, 2023 - Dec. 8, 2023, 11:59 p.m.

You are invited to review and comment on the draft agreement to clean up the site and the public participation plan.

The legal agreement, called an agreed order, requires ExxonMobil Corporation and the Port of Moses Lake to complete a remedial investigation and feasibility study. The remedial investigation will determine the full extent of petroleum contamination in soil and groundwater, and the feasibility study will evaluate cleanup options. The plan describes how you will be informed and can comment during the cleanup process. 

Información en Español​.​

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Next steps

Ecology will review all comments received during the comment period and update the draft documents if needed. If no significant changes are made, they will become final. If significant changes are made, an additional public comment period will be held. We will hold an online public meeting if 10 or more people request one.​​​​​

Site history

The site began as a U.S. Army Base in 1942. After the base closed in 1966, the Port of Moses Lake obtained the property, and it later became the Grant County International Airport.​

ExxonMobil leased facilities used to dispense jet fuel, including pumping equipment and dispensers inside the Pumphouse 1 building, six underground storage tanks (USTs), two above-ground storage tanks south of the airport, Pumphouses 2 and 3, and associated fueling hydrants northeast of Pumphouse 1.

In 1992, petroleum contamination (jet fuel) at levels requiring cleanup was found in soil. In 1993, liquid petroleum was found in a groundwater well. Later that year, liquid petroleum or petroleum products dissolved in groundwater at levels requiring cleanup were found in 14 site groundwater wells. The USTs were closed in 1995. They remain in the ground but are empty and no longer used.

Until a full investigation is completed, how jet fuel got in soil and groundwater is unknown. It could have been due to leaking tanks or piping, overfilling tanks, and/or spills during refueling.

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Comment online

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Comment by mail

Kristin Beck
4601 N. Monroe St.
Spokane, WA 99205
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Kristin Beck
Site Manager

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