Ecology invites you to review and comment on the draft periodic review report.
In August 2020, we completed the first periodic review and required no new cleanup actions at the Heglar Kronquist site. However, chloride and nitrate concentrations higher than state standards are still found in some groundwater monitoring wells. Monitoring will continue, and the deed restrictions prevent site uses inconsistent with the presence of contamination.
The site was a county gravel pit from 1963 to 1969. From 1969 to 1974, Kaiser Aluminum & Chemical Corporation disposed of aluminum black dross (dross) from its Trentwood facility at the site. Dross is a by-product from processing aluminum. Dross disposal activities stopped after elevated levels of chloride and sodium (constituents of dross) were detected in a shallow groundwater well and spring near the site. Cleanup included building a cover over the contaminated area, fencing around it, placing an environmental covenant on the property deed, and monitoring groundwater.
We conduct a periodic review at least every five years at cleanup sites where some contamination remains, as required by the Model Toxics Control Act (MTCA). The purposes of the review are to evaluate site conditions and to ensure continued protection of human health and the environment.
We will review comments received during the comment period and make recommendations for suggested changes. The periodic review will become final if no significant changes are made. An additional public comment period will be held if significant changes are made.
We will hold an online public meeting if 10 people request one.