Record of Technical Change for the Corrective Action Plan for Corrective Action Unit 224: Decon Pad and Septic Systems, Nevada Test Site, Nevada Page: 1 of 4
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RECORD OF TECHNICAL CHANGE
Technical Change No. ROTC CAP-1
Project/Job No. Corrective Action Unit 224
Project/Job Name Corrective Action Unit 224: Decon Pad and Septic Systems
Page 1 of 4
The following technical changes (including justification) are requested by:
Glenn Richardson Task Manager
Description of Change:
1. Page x, second bullet - Replace the third sentence with the following text:
These include a concrete sump containing sludge located adjacent to the concrete pad, any sediment or sludge in the
trenches on the concrete pad, and three areas of plutonium (Pu)-239-contaminated soil. A total of approximately
10 yd3 of sludge will be removed from the trenches and the sump, the sump itself will be removed generating
approximately 4 yd' of concrete debris, and a total of approximately 56 yd3 of soil will be excavated. The trenches
will be filled with grout.
2. Page 3, fourth paragraph - Replace the fourth and fifth sentences with the following text:
Additionally, the wastewater sump at CAS 06-17-04, including concrete in the sump area, will be removed and
disposed of appropriately. Any sediment or sludge in the trenches on the concrete pad will also be removed for
disposal, and the trenches will be filled with grout. Radiologically contaminated soil will be removed from several
locations identified in these CASs and disposed of appropriately.
3. Page 10- Add the following text after the second paragraph:
Several samples collected at CASs 06-17-04 and 06-23-01 exceeded the preliminary action level (PAL) of
100 milligrams per kilogram (mg/kg) for TPH-DRO. These samples were moved to a Tier 2 evaluation, which
consisted of establishing the final action levels (FALs) for the hazardous constituents of TPH-DRO at their
corresponding PAL concentrations as established in the CAIP (NNSA/NSO, 2004). As presented in the following
table, the concentrations of the hazardous constituents of TPH-DRO in these samples did not exceed the FALs.
Therefore, TPH-DRO is not considered a COC for these CASs.
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
Constituent FAL CAS 06-17-04 CAS 06-23-01
1,3,5-trimethylbenzene 70 nd nd
2-methylnaphthalene 190 0.066(J) nd
anthracene 100,000 nd nd
benzene 1.4 nd nd
benzo(a)anthracene 2.1 0.035(J) nd
benzo(a)pyrene 0.21 nd nd
benzo(b)fluoranthene 2.1 0.077(J) nd
benzo(g,h,i)perylene 29,000 nd nd
benzo(k)fluoranthene 21 nd nd
chrysene 210 nd nd
ethylbenzene 400 nd nd
fluoranthene 22,000 0.05(J) 0.028(J)
fluorene 26,000 nd nd
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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/m1/1/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.