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Study
7.
Determine need for remediation of chlorinated solvents & gasoline
(including MTBE) in groundwater in marine terminal area.
Objective.
To determine a need for remediation
of chlorinated solvents and gasoline (including MTBE) in groundwater in marine
terminal area.
Site Information
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Site
previously stored chlorinated solvents.
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Above-ground
tanks used to store gasoline and fuel hydrocarbons.
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Chlorinated
solvents (>200,000 ppb), gasoline (free product) and MTBE detected in
groundwater beneath the site.
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Gasoline
free product detected in surface water in Harbor. |
Sampling Strategy
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Performed
spatial mapping of all data.
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Stiff plots
and piper diagrams used to discriminate between fresh water and salt water.
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Chemical
fingerprinting used to distinguish separate source areas for chlorinated
solvents.
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3D
contaminant free and transport model used to delineate the contamination.
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Risks to
marine organisms quantified. |
Result
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Demonstrated
pathway of transport of gasoline to harbor. This was used to design
containment system.
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Showed that
because of subsurface geology, chlorinated solvent plumes consisted of
discrete localized hot spots not one contiguous plume as previously believed.
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Agency
concurred with evaluation and recommended "hot spot" remediation. |
For more
information about Risk-Based Decisions, Inc. call (916) 923-0570,
send
email or complete
our
online information request form.
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