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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: UST Site Assessment in Fractured Limestone
Uvalde County, Texas
By
In June, 1993 a resident notified the
owner of a nearby UST system that vacationers
tubing down the Frio River
smelled a foul odor near the location of
a particular gas station located at the top
of the river bank. An inspection of the
area revealed unweathered, unleaded
gasoline in a spring-fed well at the base
of the slope about 300 feet southeast of
the site. Immediate response activities to
abate the product and vapors were instigated.
Under the direction of the TWC
(now TNRCC) the two USTs were excavated
and inspected. The inspection
showed corrosion holes in both tanks
confirming the source of the release.
The amount of product released was
unknown. A Limited Site Assessment was
conducted to define the local geology, to
determine the adsorbed-phase
, dissolved-
phase
and
phase
-separated hydrocarbon
plume, and to determine the product
migration pathway. This information was
then used to determine the most effective
remediation system design and product
recovery method(s). The environmental
consulting company handling the
site assessment was the Houston office of
The Bourdeau Group, headquartered in
Austin. The engineering consulting company
which developed the remediation
design, oversaw the system installation,
and is currently managing the site is
Dwight Russell and Associates, headquartered
in Austin. The remediation equipment and installation contractor was
Remediation Equipment Company,
headquartered in Corpus Christi.
This presentation will cover the activities and results of the site assessment (in detail), the system design (briefly), and, if the information is made available, the results of soil vapor extraction test(s) and quarterly groundwater sampling.
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