Ft. Ord vapor intrusion study

[Lenny Siegel <lsiegel@cpeo.org>]

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A growing number of federal facilities with volatile organic compound
(VOC) groundwater plumes are investigating potential vapor intrusion. In
May, the Army released a report at Ft. Ord describing the results of
sampling on Lexington Court.

Here is the conclusion:

"The concentrations of VOCs present in the indoor air sample are within
the range of background concentrations measured during ambient air
monitoring activities conducted at the former Fort Ord. These results
suggest that the subsurface vapors from the carbon tetrachloride plume
are not contributing significantly to VOCs in indoor air. 

"A SVE [soil vapor extraction] system was implemented on April 6, 2004,
shortly after the indoor samples were collected. Soil gas concentrations
are currently being monitored throughout the affected area. Preliminary
data received from this effort show that concentrations of VOCs in soil
vapor are being reduced significantly by operation of the SVE. 

"In accordance with the decision rules presented in the SAP (Appendix
A), no further investigation of the indoor air in the vicinity of
Lexington Court and Ready Court is required. A risk assessment based on
the indoor air results is not presented in this report because the
indoor air concentrations do not exceed background. Moreover, the SVE
system is already in operation and will reduce the VOC concentrations in
the soil gas in the vicinity of the buildings. A risk assessment will be
performed in conjunction with the ongoing Remedial Investigation/
Feasibility Study of the Operable Unit CTP."


For the entire report, see
http://www.fortordcleanup.com/adminrec/ar_pdfs/AR-OUCTP-0008/

-- 


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
<lsiegel@cpeo.org>
http://www.cpeo.org

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