The facility was known to use chromated copper arsenate (CCA) to treat fence rails and mine lumber. RCRA had notified the facility regarding the proper disposal of CCA tanks located on-site, but residual product remains on-site with the potential to affect groundwater in the surrounding community.
Arsenic contamination has been determined as the main contaminant of concern at the site, and an Action Memorandum has been approved for the removal action at the site.
Site work continues. The concrete pad is being excavated, and during this process an additional concrete pad was discovered beneath the top pad. This pad will also be excavated, and the concrete from the pad will be decontaminated prior to disposal.
There are 2 pressure vessels on site, and seven tanks which housed CCA product. Pressure Vessel 1 (PV1) is currently being addressed to remove residual product. Due to the long duration between the facility shut down and the current actions, most of the CCA residual waste has been solidified. Air hammers are being introduced into PV1 to loosen up the CCA product in an effort to collect the material for disposal. Pressure vessel 2 (PV2), in which the RP had stated was never used for wood treatment activities, has been investigated, and PV2 is almost 2/3 full of CCA product. Each pressure vessel is approximately 60 feet long.
Crews are also working on tank remediation inside the facility. The seven inside tanks range in size from 28 feet in length, to 9 feet in diameter.
START has collected XRF sampling to further refine the extent of contamination across the site, and preliminary data indicate that there is mass contamination across the site, which is more than anticipated. EPA is awaiting data validation results from the sampling events, and the areas identified as contaminated will be marked off for disposal.
The concrete pad will continue to be removed, and the pad will be power waashed to remove residual contamination. A waste water collection system has been implemented to ensure that all contamination is properly collected for disposal.
Crews will continue the tank and pressure vessel cleaning of residual CCA product.
Soil excavation is anticipated to begin following the holiday remobe back to the facility.
Soil excavation, tank cleaning, and proper disposal is anticipated.
Pressure vessel 2 (PV2) will be cleaned out. The RP had stated that this vessel had never been used for wood treatment purposes.
Additional soil contamination has been observed, and additional removal activities will be necessary to address the contaminated soil across the site.
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