Source Zone Delineation Demonstration Report - Triad Resource ...

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Volumetric calculations yield an estimated 12,533,000 yd 3 of soil in the portion of the OU 12 vadose zoneconsidered in the site-wide model. This volume is approximate, and varies depending on the elevation ofthe underlying groundwater surface. The calculations also confirm previously described visualobservations: silty sand is the most predominant soil type (53%), followed by sandy-silt (23%), sand(21%), and silt (3%).5.1.2.2 Combined Modeling of Soil Architecture and TCE ContaminationThe domain of the smaller model of vadose zone soil distribution is identical to the domain of the finalmodel of TCE concentration in soil, both in terms of domain extent and discretization. The areal extent ofthe domain was shown previously in Figure 5-1, and the discretization described in Table 5.2. Theobjectives of modeling soil architecture and TCE concentration using coincident domains are tounderstand the distribution of TCE by soil type, to provide qualitative insight regarding the movement ofTCE through the vadose zone, and to obtain quantitative estimates of the mass of TCE residing in eachtype of soil.The same set of upscaled soil-type data from the 64 CPT locations used to construct the site-wide modelwere also used to construct the combined soil/TCE model. As a practical matter, however, only thosewells within and in the vicinity of the modeling domain contribute to the inference of soil type. Note thatdata from outside the modeling domain will contribute to the inference of soil type.An east-west vertical slice through the combined soil/TCE model at a northing of 298,270 ft is shown inFigure 5-19. The inset shows the location of the cross section in the modeling domain. The isoconcentrationcontours shown in the figure are 100 g/kg (green), 1,000 g/kg (yellow) and 10,000 g/kg(red), and are the intersection of the plane of the section with the corresponding iso-concentration surface.The region between contours is colored for clarity. Although the shape of the 100 g/kg contour suggeststhe sinuous movement of TCE through the vadose zone, contours are not equivalent to migrationpathways. It is unlikely that a small volume of contaminant originating in the region of highest TCEconcentration remains confined to the plane of the figure as it makes its way downward to the water table.Nonetheless, the shape of the 100 g/kg contour does provide insight to the general nature of contaminantmovement. There is a clear tendency for movement to the west, perhaps due to the sedimentary fabricimparted to the soil during deltaic deposition, as discussed previously. Locally there is a suggestion ofmigration to the east, as indicated by the portions of the 100 g/kg contour between an easting ofapproximately 1,856,065 feet and 1,856,110 feet and an elevation between about 4540 feet and 4550 feet.The eastward component of migration may be due to pathways smaller than the scale of the model. Thisdisplays only one component of transport, however: an intersecting, orthogonal cross section, discussedpresently, suggests a component of transport from north to south. Also, note the layered structure of the100 g/kg contour, with three distinct, laterally spreading bodies of TCE contamination at approximately4530 feet, 4545 feet, and 4555 feet. These may be due to the presence of fine-grained lenses, thinner thanthe scale of the model, that impede the vertical migration of TCE. Contaminant spreads laterally as aconsequence, seeking a downward pathway with less capillary resistance.March 2003 5-27 OU 12 Demonstration ReportFinal
4600W458045604540452018560004500No Vertical Exaggeration1856020185604018560601856080Easting (ft)1856100185612018561401856160Figure 5-19. East-west vertical cross-section through the combined TCE/soil model at a northing of 298,270 ft.EElevation (ft)March 2003 5-28 OU 12 Demonstration ReportFinal
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FinalSource Zone Delineation Demons
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EXECUTIVE SUMMARYThis report docume
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The SVE demonstration conducted in
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TABLE OF CONTENTSEXECUTIVE SUMMARY
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LIST OF FIGURESFigure ES-1 Iso-Conc
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Figure 5-38 Horizontal slices at fi
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LIST OF ACRONYMS AND ABBREVIATIONSA
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Hill Air Force BaseUtahRIVERDALEWeb
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Co-Team LeaderCo-Team LeaderURS Pro
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1.4 Report OrganizationThe remainin
Page 22 and 23: Davis-Weber CanalDetail AreaHillAir
Page 24 and 25: ANorthSouthU5-18864,580CROSS SECTIO
Page 26 and 27: Approx. LocationOf BarrelsInitial S
Page 28 and 29: Figure 3-2. Wireline locking and re
Page 30 and 31: 3.3 DSITMS Soil AnalyticsDirect sam
Page 32 and 33: 4.0 SOIL VAPOR EXTRACTION DEMONSTRA
Page 34 and 35: The equilibrium four-phase distribu
Page 36 and 37: 3520 ft. from well, 3.5 cfmTCE in E
Page 38 and 39: The SVE system included piping from
Page 40 and 41: SVE Process System and On-Site DSIT
Page 42 and 43: Table 4-3. Summary of OU 12 SVE Ste
Page 44 and 45: 3,000U12-VP1 Calibration Curve2,500
Page 46 and 47: 5.0 RESULTS OF SOIL SAMPLING AND SV
Page 48 and 49: 0U12-1802100U12-1803100U12-18051020
Page 50 and 51: 0102030405060700U12-1804U12-1807102
Page 52 and 53: Figure 5-4. Soil samples collected
Page 54 and 55: 298400298360Northing (ft)2983202982
Page 58 and 59: The final TCE soil contamination mo
Page 62 and 63: Figure 5-12. Isometric view, lookin
Page 64 and 65: An isometric view of the upscaled a
Page 66 and 67: March 2003 5-21 OU 12 Demonstration
Page 68 and 69: 4620WE460045804560454045204500Verti
Page 70 and 71: 4620WE460045804560Elevation (ft)454
Page 74 and 75: The position of the water table in
Page 76 and 77: 5.2 OU 12 SVE EvaluationThe OU 12 S
Page 78 and 79: Vapor Probe #1Vapor Probe #2Vapor P
Page 80 and 81: Thus, the in situ air permeability
Page 82 and 83: 0.0000-0.0010U12-VP1 ResponsePressu
Page 84 and 85: 0.000020.00000U12-VP1 ResponsePress
Page 86 and 87: Table 5-5. Estimated In Situ Air Pe
Page 88 and 89: 10.0U12-VP1 Pneumatic Response8.0Ai
Page 90 and 91: 1,400841,20072TCE Concentration (pp
Page 92 and 93: 800.98700.84TCE Concentration (ppmv
Page 94 and 95: 200.018180.016TCE Concentration (pp
Page 96 and 97: 1400.491200.42TCE Concentration (pp
Page 98 and 99: 4600OU12-VP1OU12-VP2 OU12-VP3 OU12-
Page 100 and 101: the screened interval in U12-VP1 an
Page 102 and 103: permeability layer. Final adjustmen
Page 104 and 105: Table 5-7. Comparison of Measured a
Page 106 and 107: Table 5-8. continuedFile Name Extra
Page 108 and 109: U12-1802U12-VP3U12-1812U12-1803U12-
Page 110 and 111: U12-1802U12-VP3U12-1812U12-1803U12-
Page 112 and 113: U12-1802U12-VP3U12-1812U12-1803U12-
Page 114 and 115: Figure 5-42 shows a comparison betw
Page 116 and 117: U12-VP1 50 mg/kg source 10 ft thick
Page 118 and 119: 5 10 15 20 25 30 35 40 455 10 15 20
Page 120 and 121: 25 - 30 feet bgs30 - 35 feet bgs35
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U12-VP1 200 mg/kg source 10 ft thic
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A comparison between the predicted
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5 10 15 20 25 30 35 40 455 10 15 20
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U12-VP1 EVS Maximum Soil Concentrat
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9,200Predicted TCE Concentration (p
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6.1 Conventional Sampling and Analy
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Table 6-2. Estimated Cost for OU 12
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6.1.2 Direct Push Technology (DPT)T
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Table 6-4. Estimated Cost for OU 12
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that the Wireline CPT sampler canno
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Table 6-5. Summary of Estimated Cos
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The Wireline CPT tool is not effect
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Figure 7-1. Iso-concentration surfa
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24U12-VP5 Combined Testing201612846
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8.0 REFERENCESBear, J. 1979. Hydrau
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TABLE A-1FIELD ANALYICAL RESULTS FO
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APPENDIX BSimulated TCE Vapor-Phase
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TCE Concentration (ppmv2,4702,4602,
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U12-PV1Source Area #2TCE Concentrat
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U12-PV1Source Area #2250VP1 i=24, j
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TCE Concentration (ppmvTCE Concentr
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U12-PV1Source Area #9500450VP1 i=24
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TCE Concentration (ppmTCE Concentra
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700600U12-PV1Source Area #9VP1 i=24
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U12-PV2Source Area #10250VP2 i=23,
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TCE Concentration (ppm1.00.90.80.70
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U12-PV6Source Area #101816VP6 i=33,
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TCE Concentration (ppm6050403020100
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