Client: Federal Aviation Administration
Location: Chirikof Island, Alaska
Completion Year: 2018
Scope of Work:
- Remedial investigation
- ACM surveys
- Debris removal
- Sampling and analysis
- Removal action
Brice performed a two-phase project at 10 areas of concern (AOC) at the Radio Range Facility on Chirikof Island, Alaska. Phase 1 objectives were to identify any contaminated infrastructure or with the potential to contaminate the environment with hydrocarbons, polychlorinated biphenyls (PCBs), metals, or asbestos-containing materials (ACM); any associated safety hazard; and to determine the magnitude and extent of soil and water contamination. Phase 2 objectives were to restore the former Radio Range Facility to conditions that are protective of human health and the environment, achieve a Cleanup Complete Determination from the Alaska Department of Environmental Conservation by removing and properly disposing of petroleum- and lead-contaminated soil, and assess groundwater conditions in each AOC.
During Phase 1, Brice removed 15 batteries and two empty broken transformers, 10 hardened paint cans, 15 cylinders deemed RCRA empty, and approximately one ton of lead cable. We performed ACM surveys at each former building location, collected ACM samples and bulk debris samples from the building debris, as well as soil samples at locations most likely to be contaminated based on the presence of contaminated debris and/or visual or olfactory indications of contamination. Analytical results indicated that the remaining debris at Chirikof Island was not contaminated with ACM, PCBs, or leachable lead, and therefore not an inherent danger to human health or the environment.
However, Phase 1 RI sampling results identified contaminants of concern in the soil: diesel range organics (DRO), residual range organics (RRO), and lead. During Phase 2, we removed a total of 174 cubic yards of this DRO/RRO/lead contaminated soil. Excavation of DRO- and RRO-impacted soil was guided by photoionization detector soil headspace analysis, and excavation of lead-impacted soil was guided by Niton XLp X-Ray fluorescence analysis. Groundwater was not present at the AOCs during the removal action. We recommended a Cleanup Complete determination for approval by stakeholders.
The project was performed at a remote site requiring complex mobilization and demobilization logistics; the seas around Chirikof Island are treacherous and the island has a history of shipwrecks. In the absence of a landing strip, equipment and supplies were mobilized by barge, though reaching the island shore was complicated by tide cycles and shallow waters. Brice established a man camp consisting of hard-shell bunkhouses specifically for remote Alaskan projects that will withstand harsh environmental conditions.