Proposed Petition for Removal from the Hazardous Sites List
Public Comment Period: 4/5/21– 5/5/21
2912 Highway 12, Silver Creek, WA
FS ID# 67518592
CS ID# 6502
The Pollution Liability Insurance Agency (PLIA) invites the public to comment. This is a proposal to remove the Mayfield 76 (“Site”) from the Department of Ecology’s Hazardous Sites List pursuant to WAC 173-340-330(10).
Mayfield 76 (“Site”) is an active gasoline and diesel gas station and convenience store in operation since 1959. Petroleum-contaminated soil and groundwater at the site is associated with historical underground storage tanks (USTs), piping and dispenser. The three current USTs replaced the five tanks that were removed in 1993. Contaminated soil was removed to the extent practicable in the early 1990s. Groundwater contamination is limited to one well in the former source area. Groundwater currently meets the state cleanup levels down-gradient, and remaining groundwater contamination is contained within a conditional point of compliance. Vapor monitoring in 2019 and 2020 demonstrate that residual petroleum contamination does not pose a threat to indoor air at the convenience store.
PLIA performed regulatory review of the site under the Petroleum Technical Assistance Program (PTAP). Based on the Site review and soil sampling, vapor and groundwater monitoring results, PLIA has 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. The inaccessible residual contamination left in place will be managed through institutional control under an environmental covenant filed with Lewis County.