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Health Risk Survey for Galena Airport, Alaska: Air Pathway Evaluation
Final rept. 16-23 Jun 1993
ARMSTRONG LAB BROOKS AFB TX OCCUPATIONAL AND ENVIRONMENTAL HEALTH DIRECTORATE
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Armstrong Laboratory conducted an environmental survey at Galena Airport ARPT, Alaska, to further assess ARPT environmental emissions and provide a preliminary human health risk evaluation. This was accomplished by focusing on the on and off-base air exposure pathways via soil gas testing and air sampling surveys. Results from these limited surveys indicate that noncarcinogenic and carcinogenic health effects from ARPT emissions should not adversely affect the health of nearby workers or residents. Air sampling-derived carcinogenic health risks for residential areas where 24-hourday exposures are expected, ranged from 1240,000 to 1615,000. Where the receptors are workers exposed for only 40-hrswk, the actual risks are less than 1 in 347,000. Recommendations include determining the background benzene level and further evaluating areas where high benzene vapor concentrations were identified. The soil gas sampling results indicate above 80 confidence that locations to the north of the civilian flying services upgradient had greater VOC concentrations than did those samples taken to the south downgradient, suggesting that the contamination plume originated in the petroleum, oil, and lubricants POL area and not the flightline. The relationship of higher VOC concentrations measured in soil gases upgradient was not observed in the ambientindoor air sampling results. Recommendations include continued soil gas well surveillance throughout the POL remediation process.
APPROVED FOR PUBLIC RELEASE