The facility was known to use chromated copper arsenate (CCA) to treat fence lumber and mine lumber. Arsenic contamination has been determined as the main contaminant of concern, and an Action Memorandum has been approved for the removal of arsenic contaminated soils, sediments and residual CCA product in the pressure vessels and tanks on site.
Crews are continuing the cleanup of Pressure Vessel 01 (PV01), using scraping, metal wheel grinding and pressure washing to remove residual CCA waste from the floor and walls of the 60'X5' pressure vessel.
Soil excavation has been conducted along the northern side of the facility, and into the rear, western side of the facility. A few underground pipes have been discovered as a result of the excavation activities, and these pipes will be investigated.
There are eight tanks inside the treatment facility, and these tanks have been torched open to investigate their contents. Two of the Tanks have been cleaned, and deemed acceptable by the OSC.
The rail cars, which provided the means to move lumber in and out of the pressure vessels, have been cut down to manageable sizes for haz waste disposal.
Two 20yd rolloffs have arrived at the site, and crews will begin loading bagged CCA residual into the rolloffs for later disposal.
Crews will continue cleanup operations inside PV01, and will then move to begin cleanup operations in Pressure Vessel 02 (PV02). PV02 is siomilar in quality to PV01; however, this tank measures 40' in length.
Soil excavation will continue along the northern side of the property, and into the drainage ditch areas across the facility property.
Samples will be collected in areas where the underground piping was discovered, and in areas where the pipes discharge.
Soil excavation will continue, and soil will continue to be stockpiled awaiting disposal. ERRS has initiated the lab and disposal bidding process, and it is anticipated that haz waste material will begin moving offsite in the late June/early July timeframe.
The RP was briefed on the status of the removal action by the OSC, and the RP had indicated that he had directed his employees to not visit the site for any reason. Also, the RP was briefed on the cleanup of the interior tanks, and mentioned that EPA did not need to reweld the newly exposed manways created for cleanup access. However, to avoid any future liability issues, the OSC had informed the RP that the tanks will be rewelded and resealed.
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