Objective.
To
delineate a chlorinated solvent plume in groundwater.
Site Information
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Solvent
distribution facility
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Shallow
groundwater at about 9-11ft bgs
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PCE in
groundwater beneath the site at > 100,000 ppb
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Pump and
treat system operating onsite for 3 years
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Click on the graphic for a larger view. |
Sampling Strategy
Designed
multi-depth soil gas sampling strategy, using geostatics, to determine sampling
location, depth, and spacing.
Results
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The data are
shown as pie charts, with each "slice" reflecting the relative proportion of
that popular contamination.
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The spatial
distribution of PCE (red) and its daughter products, TCE (blue), cis-1,2-DCE
(green) and trans-1,2-DCE (yellow) in soil gas samples collected from about
one foot above the water table were mapped using GIS.
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At least
two, and perhaps three, separate and distinct plumes were identified, only one
of which could have originated from our client’s property.
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The soil gas
mappings shows:
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Two distinct plumes of chlorinated
solvents, one dominated by the parent compound PCE, originated from the site
and migrated towards Building 2 while the other dominated by cis-1, 2-DCE
(green) begins behind Building 1 and heading toward Building 6.
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The plume originating from the site
shows a marked attenuation in PCE in the alleyway between Buildings 1 and 2.
Behind Building 2, the proportions of PCE increase dramatically. This
indicates the beginnings of a different source (third plume) of PCE
contamination.
For more
information about Risk-Based Decisions call 916.923.0570, send email or complete
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