Problems/Comments

In July 2014, a 5,000-gallon diesel underground storage tank (UST #1) was removed from the Alaska Department of Transportation and Public Facilities at the Klawock Maintenance Station. The UST was located just east and adjacent to the generator building and was historically used to fuel the generator. The UST Removal Site Assessment indicated that the fiberglass tank was in excellent condition with no holes or suspected leaks. Fuel odors were noted around the fill pipe indicating potential contamination from overfilling during fuel transfer operations. Analytical soil sample S1 collected from the south sidewall soil sample at the existing soil/groundwater interface (5.5 feet below ground surface) had concentrations of diesel range organics (DRO) above cleanup levels, but polycyclic aromatic hydrocarbon compounds were below laboratory reporting limits and cleanup levels. The sample collected below the vent stickup at the Generator Building had DRO, benzene, toluene, ethylbenzene, and xylene results below DEC cleanup levels. The Leaking Underground Storage Tank Release Investigation concluded that a Corrective Action Plan should confirm that commercial/industrial use of the facility is expected to continue, potential exposure pathways are limited, verify groundwater contamination is limited to the former UST area of the industrial facility, develop a long-term groundwater monitoring plan that defines specific sampling locations, sampling frequencies, and laboratory analyses, and explore using monitored natural attenuation as an effective long-term remediation strategy.

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Contaminant Information

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Requirements