skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: SUPPLEMENTAL PACKAGE FOR THE SCOPING SUMMARY FOR THE P-AREA OPERABLE UNIT

Abstract

Arsenic and selenium were tentatively identified as ecological RCOCs for the PAOU Ash Basin (PAOU Post-Characterization/Problem Identification Scoping Meeting, March 2007). Core Team agreed to consider eliminating these constituents as RCOCs based on a revised uncertainty discussion. The ecological risk tables and revised text (in its entirety) for the PAOU Ash Basin are provided in the Supplemental Information Package for the FS Scoping Meeting (June 2007). Arsenic and selenium have been traditionally carried through as ecological RCOCs (D-Area Ash Basin, A-Area Ash Pile).

Authors:
; ;
Publication Date:
Research Org.:
SRS
Sponsoring Org.:
USDOE
OSTI Identifier:
908028
Report Number(s):
ERD-EN-2007-0064
TRN: US0703534
DOE Contract Number:
DE-AC09-96SR18500
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; ARSENIC; SELENIUM; RISK ASSESSMENT; ASHES; WASTE DISPOSAL; SAVANNAH RIVER PLANT

Citation Formats

Kupar, J, Sadika Baladi, S, and Mark Amidon, M. SUPPLEMENTAL PACKAGE FOR THE SCOPING SUMMARY FOR THE P-AREA OPERABLE UNIT. United States: N. p., 2007. Web. doi:10.2172/908028.
Kupar, J, Sadika Baladi, S, & Mark Amidon, M. SUPPLEMENTAL PACKAGE FOR THE SCOPING SUMMARY FOR THE P-AREA OPERABLE UNIT. United States. doi:10.2172/908028.
Kupar, J, Sadika Baladi, S, and Mark Amidon, M. Wed . "SUPPLEMENTAL PACKAGE FOR THE SCOPING SUMMARY FOR THE P-AREA OPERABLE UNIT". United States. doi:10.2172/908028. https://www.osti.gov/servlets/purl/908028.
@article{osti_908028,
title = {SUPPLEMENTAL PACKAGE FOR THE SCOPING SUMMARY FOR THE P-AREA OPERABLE UNIT},
author = {Kupar, J and Sadika Baladi, S and Mark Amidon, M},
abstractNote = {Arsenic and selenium were tentatively identified as ecological RCOCs for the PAOU Ash Basin (PAOU Post-Characterization/Problem Identification Scoping Meeting, March 2007). Core Team agreed to consider eliminating these constituents as RCOCs based on a revised uncertainty discussion. The ecological risk tables and revised text (in its entirety) for the PAOU Ash Basin are provided in the Supplemental Information Package for the FS Scoping Meeting (June 2007). Arsenic and selenium have been traditionally carried through as ecological RCOCs (D-Area Ash Basin, A-Area Ash Pile).},
doi = {10.2172/908028},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed May 23 00:00:00 EDT 2007},
month = {Wed May 23 00:00:00 EDT 2007}
}

Technical Report:

Save / Share:
  • This scoping summary supports development of the combined Remedial Investigation (RI)/Baseline Risk Assessment (BRA)/Feasibility Study (FS) for the P-Area Operable Unit (PAOU), or Combined document, which will be submitted on or before 09/28/2007. The objective of this Feasibility Study scoping summary meeting is to agree on the likely response actions to be evaluated and developed as alternatives in the combined document and agree on the uncertainties identified and whether they have been adequately managed.
  • Site data evaluated indicate that after source removal, dilution and dispersion appear to be the primary processes that would further attenuate groundwater contaminant concentrations. On the basis of these attenuation processes, the calculations presented in Chapter 2 indicate that it would take several years to decades (approximately 60 to 150 and 14 years, respectively, for Zones 1 and 2) for TCE concentrations in Zones 1 and 2 to attenuate to the MCL (or ARAR) of 5 pg/L. The estimates for Zones 1 through 3, where the higher nitrate concentrations are clustered, indicate that it would likely take at least 80more » years for nitrate concentrations to attenuate to the MCL (or ARAR) of 10 mg/L. Costs for implementing NINA for groundwater at the chemical plant area are primarily associated with those incurred for monitoring contaminant concentrations and the replacement costs for monitoring wells. Cost estimates are relatively high because a rather lengthy period of monitoring would be involved. Calculations performed to evaluate the feasibility of groundwater removal and subsequent treatment of the extracted water included determinations for the number of extraction wells needed, required number of pore volumes, and the number of years of implementation required to attain bench marks. The calculations were performed per zone of contamination, as discussed in Chapter 1. Several observations can be made about the results presented in Chapter 3 regarding Alternative 4. The first is that by looking at the results for Zones 1 and 2 evaluated under Alternative 4, one can also assess the feasibility of Alternative 7, because Alternative 7 addresses this particular subset of Alternative 4 (i.e., Zones 1 and 2). TCE contamination has been observed in Zones 1 and 2, but has not been reported in any of the remaining five zones. Nitrate, nitroaromatic compounds, and uranium have also been reported in Zones 1 and 2. The present-worth costs for implementing the pump and treat alternative in Zones 1 and 2 constitute the major component of the overall present-worth cost for Alternative 4, which indicates that the cost for Alternative 7 would be similarly high. Another observation is that although estimated times are shorter for the pump and treat approach than those for MNA, pump and treat for Zones 1 and 2 likely would take several decades (at least 30 years) to attain ARARs or bench marks. The cost estimates (in present-worth costs) for Alternatives 4 and 7 are much higher (approximately an order of magnitude higher) than those for Alternative 3.« less
  • The Soils and Groundwater Closure Projects Reactor Team requested support from the Environmental Sciences and Technology Department of the Savannah River Technology Center to conduct a source term determination for the P Area Reactor Groundwater Operable Unit. The identified documents reviewed and pertinent findings are recorded in this report.
  • A review of historical documents has been conducted to identify potential sources of contamination to the P Area Reactor Groundwater Operable Unit. Both classified and unclassified documents repositories at the Savannah River Site were searched. The results of the historical document review indicated the principal sources of groundwater contamination are associated with routine operating practices over the operating life of the P Reactor facilities. The document search did not find any major abnormal release events/accidents that would have caused a substantial release to the ground surface or surface water bodies. Steel Creek and the Reactor Seepage Basins were the primarymore » discharge points of radioactive contamination. Potential organic solvent sources could be associated with the 704-P maintenance shop and reactor operations. Review of geologic investigations prior to construction of the reactor, indicate zones of potential preferential flow in the Lower Aquifer Zone of the Upper Three Runs Aquifer. Contaminated water intersecting these zones would potentially be transported at a faster rate than the surrounding formation.« less
  • This report documents the development of a numerical groundwater flow and transport model of the hydrogeologic system of the P-Area Reactor Groundwater Operable Unit at the Savannah River Site (SRS) (Figure 1-1). The P-Area model provides a tool to aid in understanding the hydrologic and geochemical processes that control the development and migration of the current tritium, tetrachloroethene (PCE), and trichloroethene (TCE) plumes in this region.