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Use Of Scaps Suite Of Tools To Rapidly Delineate A Large Mtbe PlumeNormal access

Authors: Mark Kram and Ernest Lory
Event name: 11th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
Session: Methods Emphasis: Developments In Direct Push Technologies
Publication date: 22 March 1998
Organisations: EEGS
Language: English
Info: Extended abstract, PDF ( 2Mb )

Summary:
The Navy Site Characterization and Analysis Penetrometer System (SCAPS) was used to
rapidly delineate the extent of a dissolved Methyl Tertiary Butyl Ether (MTBE) plume
resulting from an underground storage tank system petroleum release. Records indicated
that approximately 11,000 gallons (42 cubic meters) of leaded and unleaded gasoline
were released from the tank system between September 1984 and March 1985. MTBE
was identified in the most downgradient monitoring wells present at the site in the Fall of
1996. These wells were beyond the extent of the delineated benzene plume, but
contained MTBE levels exceeding 10 parts per million (ppm). A combination of
innovative water sampling, rapid turn around chemical analyses, near real-time plume
mapping, and geophysical methods were used to delineate the extent of the MTBE plume
to 35 parts per billion (ppb) concentration levels, install longitudinal and sentry wells in
the most appropriate locations, and conduct the site characterization efforts in an
expedient fashion. During the 15 field days it was determined that the dissolved MTBE
plume extends approximately 4,100 feet (1,250 meters) in length, approximately 500 feet
(150 meters) in width through the widest segment, and approximately 33 acres (133,55 1
m”) in map view. Assuming that contaminants were first introduced into the aquifer in
September 1984, the calculated linear contaminant velocity for dissolved MTBE at the
downgradient edge of the plume is approximately 342 feet (104 meters) per year for this
site.

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