Record of Technical Change for the Corrective Action Plan for Corrective Action Unit 224: Decon Pad and Septic Systems, Nevada Test Site, Nevada Page: 2 of 4
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S
Maximum Concentrations (mg/kg) of the Hazardous Constituents of Diesel for Samples Containing
TPH-DRO Concentrations Greater than 100 mg/kg in CASs 06-17-04 and 06-23-01
(continued)
Constituent FAL CAS 06-17-04 -CAS 06-23-01
n-butylbenzene 240 nd nd
n-propylbenzene 240 nd nd
phenanthrene 100,000 0.018(J) nd
pyrene 29,000 nd 0.11(J)
toluene 520 nd nd
total xylenes 420 nd nd
nd = not detected above analytical limits in any samples
J = estimated value
4. Page 10, third paragraph - Delete the list and replace the second sentence with the following text:
Sludge and concrete will be removed from the wastewater sump area and disposed of appropriately. Any sediment
or sludge in the trenches on the concrete pad will also be removed and disposed of appropriately, and the trenches
will be filled with grout. Pu-239-contaminated soil will be removed from Areas A, B, and C and disposed of
appropriately.
5. Page 10, fifth paragraph ("Area A") - Replace the first sentence with the following text:
Characterization results for soil samples indicated Pu-239 to be above the FAL of 168.1 picoCuries per gram
(pCi/g), as determined by the Residual Radiation (RESRAD) evaluation (NNSA/NSO, 2005).
6. Page 11 - Replace Figure 5 with the attached Figure 5.
7. Page 12, first paragraph - Replace the first, second, third, and fourth sentences with the following text:
After the planned volume of soil has been removed, a minimum of two soil verification samples will be collected
from the base of each excavation. Samples will be analyzed for isotopic Pu to verify that the remaining soil is
below the action level.
8. Page 12 - Delete the third, fourth, and fifth paragraphs ("Concrete Decontamination Pad" and "Areas D, E,
F, and G").
9. Page 14, second paragraph ("Hydrocarbon Waste") - Replace the first sentence with the following text:
Although not expected, if hydrocarbon waste is generated, it will be analyzed for gamma-emitting radionuclides by
either ISOCS or laboratory analysis, in order to satisfy the landfill disposal restrictions.
10. Page 14, third paragraph ("Low-Level Waste") - Replace the first sentence with the following text:
Closure activities may include removal of radiologically contaminated soil.
Justification:
The samples collected at CASs 06-17-04 and 06-23-01 that exceeded the PAL for TPH-DRO were moved to a Tier 2
evaluation, which consisted of establishing the FALs for the hazardous constituents of TPH-DRO at their corresponding PAL
concentrations. The concentrations of the hazardous constituents of TPH-DRO in these samples did not exceed the FALs.
Therefore, TPH-DRO does not represent a significant risk and is no longer considered a COC for these CASs. Soil in
Areas D, E, F, and G, where samples exceeded the PAL for TPH-DRO, will therefore be left in place. The concrete
decontamination pad was originally planned to be removed in order to access the TPH-DRO-contaminated soil located
beneath the pad. Because the soil beneath the pad will be left in place, the concrete decontamination pad will also be left in
place.
The project time will be decreased by approximately 8 days.
Applicable Project-Specific Document(s):
Corrective Action Plan for Corrective Action Unit 224: Decon Pad and Septic Systems, Nevada Test Site, Nevada.
July 2006. DOE/NV--1143. Las Vegas, NV.
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National Security Technologies, LLC. Record of Technical Change for the Corrective Action Plan for Corrective Action Unit 224: Decon Pad and Septic Systems, Nevada Test Site, Nevada, report, August 1, 2007; United States. (https://digital.library.unt.edu/ark:/67531/metadc886083/m1/2/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.