If you missed the September meeting regarding soil and water clean up at Precision Castparts/PCC Structurals, see the information below from the Oregon DEQ:
- Where the sediment that gets collected in the water treatment system goes
- What is the process a site goes through in the DEQ cleanup program
Regarding the sediment in the water treatment system:
The sediment in the settling tanks is removed along with the sand and granular activated carbon materials from the filters. This waste mixture is stored in a container. The waste is sampled to determine what landfill the waste needs to go to. Concrete is then added to the waste, to ensure no free-liquids (liquid wastes that would be prone to leaching) are sent off-site. This complete cleaning is done annually. Since 2016 when the water treatment system was installed, waste has never been found to be hazardous. The sample test results from the most recent disposal activity are attached. This form marks the waste as non-hazardous, which is typical, so the waste was transported to the Waste Management’s Hillsboro Landfill for disposal. If waste was ever to be found hazardous, it would be disposed at the landfill in Arlington, which is licensed to take hazardous waste.
Regarding DEQ’s role in the site cleanup process:
We have developed a fact sheet to help explain this process (see attached). In summary, the following steps are typically followed:
- Remedial investigation: DEQ oversees the owner’s investigation of the site for potential contamination
- Risk assessment: validates or confirms whether there is a contamination risk to humans and the environment
- Feasiblity study: following the risk assessment, if the site needs to be cleaned up, DEQ evaluates proposed methods for cleanup and makes a final determination called a Record of Decision.
- Cleanup: DEQ oversees implementation and documentation of the cleanup in conformance with the Record of Decision
- No Further Action: If DEQ determines the cleanup has been performed as directed by the Record of Decision, the regulatory process is complete and DEQ issues a document to the site owner called a No Further Action letter. Sites may carry long-term requirements that are recorded on their deeds, such as ongoing monitoring and development restrictions, when necessary.
A copy of the presentation is available at the site’s webpage.
DEQ will be holding a public information meeting about air quality early on in 2020.
Contact Lauren Wirtis, Public Affairs Specialist with Oregon Department of Environmental Quality (Northwest Region) with questions regarding this information.