|
Study 1.
Delineate a chlorinated
solvent plume in groundwater.
Objective.
To
delineate a chlorinated solvent plume in groundwater.
Site Information
 |
Solvent
distribution facility
|
|
|
Shallow
groundwater at about 9-11ft bgs
|
|
|
PCE in
groundwater beneath the site at > 100,000 ppb
|
|
|
Pump and
treat system operating onsite for 3 years |
|
 |
|
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
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.
At least
two, and perhaps three, separate and distinct plumes were identified, only one
of which could have originated from our client’s property.
The soil gas
mappings shows:
-
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.
-
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, Inc. call (916) 923-0570,
send
email or complete
our
online information request form.
|
