Model for estimation of chlorinated solvent release from waste disposal sites

Walton, John C.; Rood, Arthur S.; Baca, R.G.; Otis, Mark D.

doi:10.1016/0304-3894(89)85074-5

Cited by 6 publications

(6 citation statements)

References 5 publications

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“…Releases of volatile organic compounds (VOCs) and hazardous particulate matter (e.g., asbestos, metals) could occur during excavation of wastes from Pit 9 at the Radioactive Waste Management Complex (RWMC). Release calculations for VOCs were based on a mathematical model developed for estimating the release and transport of chlorinated solvents in the vadose zone beneath h,a.ardous waste sites (Walton et al, 1989). The model formulation accounts for container degradation, interphase mass transfer, waste decomposition, soil temperature effects on physical and chemical properties of the waste, and mass transport through geologic media.…”

Section: Discussionmentioning

confidence: 99%

Finding of no significant impact for the interim action for cleanup of Pit 9 at the Radioactive Waste Management Complex, Idaho National Engineering Laboratory

1993

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The Departmentof Energy (DOE) has prepared an environmental assessment(EA), DOE/EA-0854,for an interim action under the Comprehensive EnvironmentalResponse,Compensation,and LiabilityAct (CERCLA). The proposed action would be conducted at Pit 9, Operable Unit 7-10, located at the SubsurfaceDisposal Area (SDA) of the RadioactiveWaste ManagementComplex (RWMC) at the Idaho National EngineeringLaboratory (INEL). The proposed action consists of constructionof retrieval and processingbuildings, excavationand retrievalof wastes from Pit 9, selectivephysical separation and chemical extraction, and stabilizationof wastes either through thermal processingo_zr by forming a stabilizedconcentrate. The proposed action would involve limited waste treatmentp_.ocesstesting and full-scalewaste treatment processingfor cleaning up pre-1970 Transuranic (TRU)wastes in Pit g.

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Section: Discussionmentioning

confidence: 99%

Finding of no significant impact for the interim action for cleanup of Pit 9 at the Radioactive Waste Management Complex, Idaho National Engineering Laboratory

1993

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“…Soil Conservation Service, Adams Ranch, NM, monitoring location that had similar latitude (34.25 N) and elevation (1,882 m) as the San Mateo wash. The temperature data at 20.32 cm (8 in) were fit to a function from Kirkham and Powers (1972) as presented in Walton et al (1989): The phase shift term is added in the sine function, so the simulation begins on 1 January. The average temperature (Ta) and amplitude (A o ) are adjusted as needed for site-specific conditions.…”

Section: Ubiquitous Radon Sourcesmentioning

confidence: 99%

Spatial Variability and Behavior of Background Radon Concentrations in Ambient Air in the San Mateo Basin of the Grants Mineral Belt

Rood¹,

Whicker²

2022

Health Physics

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A modeling study and analysis of measurement data was conducted in the San Mateo basin near the former Homestake Mining Company of California's mill site located north of Milan, NM, to understand the spatial variability of background radon and identify a suitable background station. Recent guidance from the US Nuclear Regulatory commission clarifies the requirement that dose assessments of existing facilities be based on environmental measurements at the facility's unrestricted boundary instead of predictive modeling. Background is important because it is subtracted from radon measured at the boundary for dose calculations. The current background station lies on the slopes above the wash floor. The mill site contains two tailing piles with a total area of 1.03 km 2 that in 2019 emitted 1,750 mBq m −2 s −1 from the larger of the piles and 320 mBq m −2 s −1 from the smaller pile. Atmospheric transport modeling was conducted to facilitate understanding of the movement of radon in the San Mateo wash bottom and surrounding hillsides. The model was validated using emission and measurement data from the nearby Ambrosia Lake mining region. The modeling, in combination with current measurements and previous studies, indicated the wash floor has characteristically higher radon concentrations than the slopes above the wash. This phenomenon was attributed to (1) higher radon soil flux in the alluvial sediments that make up the wash floor, (2) nocturnal drainage flow that results in a pooling of radon on the wash floor, and (3) inversion conditions that trap radon in a shallow air mass on the wash floor during late evening and early morning hours. Using a regression of predicted and observed radon concentrations, a background concentration of 25.7 Bq m −3 was derived that was close to that measured at background stations about 4 km north of the tailings pile and on the San Mateo wash floor.

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“…Specific goals of the performance assessments generally include: (1) water infiltration and travel times through the vadose zone , (2) possible effects of site flooding on migration of actinide elements (Rawson et al,199I) and (3) assessment of organic vapor generation and movement (Walton et al, 1989). Flow and transport models were originally developed for use in performance assessments of waste sites at the RWMC.…”

Section: Absti_ctmentioning

confidence: 99%

“…By properly defining the coefficients of the advection-dispersion equation, the FLAME code can be applied to model transport of contaminants in gaseous and colloidal ptaases. For example, Walton et al (1989) modeled the transport of organic vapors from INEL's t Radioactive Waste Management Complex using a advection-dispersion formulation.…”

Section: Mass Transport Equationmentioning

confidence: 99%

FLAME: A finite element computer code for contaminant transport n variably-saturated media

Baca¹,

Magnuson²

1992

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Model for estimation of chlorinated solvent release from waste disposal sites

Cited by 6 publications

References 5 publications

Finding of no significant impact for the interim action for cleanup of Pit 9 at the Radioactive Waste Management Complex, Idaho National Engineering Laboratory

Finding of no significant impact for the interim action for cleanup of Pit 9 at the Radioactive Waste Management Complex, Idaho National Engineering Laboratory

Spatial Variability and Behavior of Background Radon Concentrations in Ambient Air in the San Mateo Basin of the Grants Mineral Belt

FLAME: A finite element computer code for contaminant transport n variably-saturated media

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