Proposed Delisting: Unocal Bulk Plant 0321

Proposed Petition for Removal from the Hazardous Sites List

Public Comment Period: April 6, 2023 -May 6, 2023

633 North 1st Avenue, Kelso, WA 98626

FS ID# 1094
CS ID# 3788

The Pollution Liability Insurance Agency (PLIA) invites the public to comment. This is a proposal to remove Unocal Bulk Plant 0321 (“Site”) from the Department of Ecology’s Hazardous Sites List pursuant to WAC 173-340-330(10).

The Site operated as a bulk fuel terminal from 1929 until 1989. Prior to ceasing operations, petroleum contaminated soil (PCS) was detected above state cleanup levels in 1988. In 1992, during facility decommissioning activities, two 8,000-gallon lube oil aboveground storage tanks (ASTs) were removed along with six gasoline and diesel ASTs of unknown capacity, and one 4,000-gallon underground storage tank (UST) of unknown contents. Petroleum-contaminated groundwater (PCGW) was detected at the Site in the early 1990s-2010s. From 2012 to 2013, approximately 2,500 tons of PCS was removed from the Site. Approximately 450 pounds of an oxygen releasing compound was also applied as a backfill amendment at the groundwater interface to promote natural attenuation. Since then, PCS has successfully been remediated to a level below state cleanup levels, and, from 2021-2022, quarterly groundwater monitoring results also show that groundwater contamination on the Site has declined to levels below state cleanup levels.

PLIA performed regulatory oversight of the Site under the agency’s Technical Assistance Program (TAP). Based on the Site review, PLIA determined that the Site meets the substantive requirements of the state clean up regulations, Chapter 173-340 WAC Model Toxics Control Act, and no longer poses a threat to human health or the environment.

Site Documents

Documents may also be reviewed by appointment at:

  • PLIA’s office, 500 Columbia St. NW, Olympia, WA 98501 (call 800-822-3905 or email for an appointment)

You may provide written comments using PLIA’s online comment/contact form, or by email at