|From:||Lenny Siegel <firstname.lastname@example.org>|
|Date:||13 Jul 2005 04:28:05 -0000|
|Subject:||[CPEO-IRF] Vapor Intrusion sites at McClellan Air Force Base (CA)|
The Air Force Real Property Agency is holding a public meeting on
Wednesday, July 13, 2005 on its Proposed Plan for Soil Gas Mitigation at
former McClellan Air Force Base, Sacramento, California (BRAC 95). In
question are two sites at the southwestern portion of the former base.
At Site PRL T-46, former site of a removed oil/water separator tank, the
Air Force has concluded, with state concurrence, that there is no need
for further action.|
However, at Site SA-16, the Air Force concluded that the residential risk from exposure to naphthalene and benzene vapors would be approximately 100 in a million, but considers it acceptable. Its proposed solution is an institutional control against residential use on the site.
"SA 16 (Benzene, Ethylbenzene and Naphthalene), proposed for institutional controls: This site contains open hangars that were used for aircraft maintenance and fueling and defueling operations. There are records of jet fuel spills, and the potential exists for subsurface releases of fuels and associated materials. During recent investigations at the site, over 80 samples were taken. Major vapor intrusion pathway contaminants include, ethylbenzene, elevated in one sample, and benzene and naphthalene, elevated in two samples each.
"The risk from the vapor intrusion pathway does not exceed the acceptable risk range for unrestricted use. (Risk range and how it is used is described in more detail in section E.) However, sufficient uncertainty exists concerning the total risk at the site that the Air Force is proposing to limit the use of the property to industrial activities until the total risk is better defined during remedy design. This would be accomplished using institutional controls which would preclude residential use of the sites by the use of zoning and deed restrictions. By limiting activities at the site, the occupant's exposure and consequent risk is greatly reduced."
The state of California disagrees with this proposal.
The Air Force proposed plan is attached as a 700K PDF file.
-- Lenny Siegel Director, Center for Public Environmental Oversight c/o PSC, 278-A Hope St., Mountain View, CA 94041 Voice: 650/961-8918 or 650/969-1545 Fax: 650/961-8918 http://www.cpeo.org
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