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The following case studies
illustrate performance from customers who have used Sitelab’s
UVF-3100 analyzer for Extractable Petroleum Hydrocarbons (EPH).
Regulatory agencies in Massachusetts, North Carolina, Alaska and several
other states require this test for TPH sites, where Gas Chromatography is used to
separately report the aliphatic hydrocarbons from the more toxic
aromatic hydrocarbon fraction; an expensive, time consuming and
sometimes difficult method for laboratories to perform. Using
Sitelab's PAH calibration kit on the Slot A optics, the analyzer
accurately measures the EPH C11-C22 aromatic hydrocarbon fraction
(or total PAH) in a sample. |
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Home Heating Oil
Spill
A contractor split samples with Sitelab and a certified
laboratory, testing soils contaminated with heating oil after
removing a homeowner’s underground fuel tank.
Sitelab's field results were used to help guide excavation.
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Industrial Site with USTs
A contractor used Sitelab’s mobile laboratory service to
help delineate fuel oil contamination after removing several
underground storage tanks.
The property, a former textile factory, was being redeveloped into a shopping center.
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Diesel
Fuel Tank Site
After removing an above ground diesel tank once used for refueling trucks,
a contractor used Sitelab to help excavate all the impacted soil.
A
vacuum truck was then used to remove the contamination
above the bedrock until the EPH concentrations were low
enough and
the site was cleaned up.
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Phase 2 Environmental Site Assessment
In 2007, Subsurface Environmental Solutions, LLC, performed
a two day site investigation on a commercial property which once
stored fuel tanks below and above the ground, resulting in a
subsurface plume of oil (LNAPL). A drill rig was used to collect
soil samples, which were tested within minutes on-site. A
total of 75 samples from 11 borings were tested using Sitelab,
helping the engineer to delineate the vertical and horizontal spread
of contamination. Sitelab's EPH data was then used to generate
3-D visualization maps of the site's contamination.
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»For more details, visit:
Subenviro.com |
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Sitelab correlated well to all confirmatory soils sent off-site to a
certified lab.
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EPH Evaluation Study...
Ambient Engineering, Inc. of Concord, Mass (USA) has
been using Sitelab since 2002 to investigate and remediate a
former
tank farm along Boston Harbor which is contaminated by a
large, subsurface plume of commingled diesel fuel and No. 6
fuel oil.
In 2003, the Licensed Site Professional (LSP)
evaluated Sitelab to Lab 1 testing 15 soils for EPH which
correlated well. Two
years later, they wanted to evaluate the accuracy of Sitelab
against several different laboratories they use for
confirmation, including Lab 1 again.
Soil samples were collected from ten different
locations having different depths and concentrations.
Samples were analyzed using the Massachusetts DEP’s
GC/FID method for Extractable Petroleum Hydrocarbons and
results were compared to Sitelab’s UVF-3100 analyzer for EPH
C11-C22 aromatic hydrocarbons, the primary driver for this
TPH site.
Sitelab correlated best to Lab 1 and then to Lab 2,
while Lab 3 showed the poorest correlation.
The wide range of
concentration differences exhibited between the three
certified laboratories, illustrates how difficult it can
sometimes be when comparing field screening tools to the
lab. Who’s right and
who’s wrong?
According to the LSP “Statistically, Sitelab performed
better than all three laboratories and it cost us a lot less
money.”
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