Facility site check report transportation safeguards divsision (TSD) underground storage tanks 2334-U and 2335-U at Building 9714 Page: 65 of 122
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SAMPLING PROCEDURES
To document conditions within the excavation, six samples were collected in the positions
indicated on Figure 1. Prior to collection of each sample, a hand auger was decontaminated
by soap and tap water wash, tap water rinse, isopropyl alcohol rinse, and a final rinse in
distilled water. Disposable latex gloves were worn during collection of samples to minimize
the risk of accidental cross contamination. Representative portions of each sample were split
into duplicates. One split was placed in a new clean, glass jar with a Teflon'i lined screw
cap. The sample was immediately placed in a chilled cooler. The other split was placed in
a new, plastic lock bag. The sample placed into the plastic lock bag was sealed and allowed
to approach air vapor equilibrium conditions (at least 10 minutes) before the probe of a
Foxboro Model 128 Organic Vapor Analyzer (OVA) was inserted into the bag and the
headspace reading recorded. OVA field screen readings are summarized in Table I.
LABORATORY ANALYSIS
The soil samples were subsequently submitted for laboratory analysis. Environmental Science,
an independent subcontract laboratory, analyzed the samples for Total Petroleum
Hydrocarbons (TPH)-Full Range and for Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX)
by respective Methods 8015 and 8020. The laboratory results and chain of custody forms
may be found in their entirety in Appendix A and are summarized in Table II.
LABORATORY RESULTS
The laboratory results were received in this office on March 2, 1992. Laboratory analytical
data indicates that if BTEX were present in all samples submitted, they were present in
concentrations below the laboratory specified detection limit. Detectable levels of TPH-Full
Range were present in samples 7, 9, and 10 in respective concentrations of 185.3 parts per
million (ppm), 981 ppm, and 1,694 ppm.
Soil samples 7, 9, and 10 exceed the Tennessee Department of Environment and
Conservation (TDEC), UST Division, action limit for soil. The TDEC action limit for TPH is 100
ppm. A copy of the action limits endorsed by the Division are in Appendix B.
C-62
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Facility site check report transportation safeguards divsision (TSD) underground storage tanks 2334-U and 2335-U at Building 9714, report, September 1, 1995; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc623941/m1/65/: accessed April 26, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.