Source Zone Delineation Demonstration Report - Triad Resource ...

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March 2003 5-21 OU 12 Demonstration ReportFinalFigure 5-14. Isometric view, looking northeast, of a block diagram of the site-wide vadose zone soil architecture model.
A series of vertical, east-west cross sections through the model illustrate the complex, interbedded, andspatially variable nature of the soil architecture at OU 12. Figure 5-15 shows a cross section near thesouthern end of the model at a northing of 297,800 ft. The position of the cross section is approximatelyone-fifth the distance to the northern end of the model, as illustrated by the inset on the figure. Prominentlenses of sand occur in the upper part of the section, especially to the west, but the lenses are notconnected across the entire width of the cross section. Minor, isolated sand lenses occur deeper in thesection. Sandy silt and silt are uncommon in comparison to silty sand and sand. A cross section 400 feetto the north, at a northing of 298,200 feet, roughly midway between the northern and southern ends of themodel, is shown in Figure 5-16. Prominent sand bodies continue to occur in the upper part of the section,but the largest of these is now on the east rather than the west. Larger, more numerous isolated sandlenses occur at depth. There is no connection between sand lenses across the width of the section. Sandysilt and silt remain minor in comparison to silty sand and sand. Note that the thickness of the section hasincreased by approximately 10 feet, due mainly to the northward dip of the groundwater surface. Therelative size of sand lenses diminishes near the northern end of the model (northing of 298,600 ft), asshown in Figure 5-17. In addition, the sand lenses appear to be somewhat more isolated than in the south.The fraction of sandy silt is much higher, dominating the lower two-thirds of the section on the west. Thethickness of the vadose zone has increased, again by about 10 feet, primarily because of the northward dipof the groundwater surface, but also due in part to increased elevation of the ground surface.A north-south vertical cross section, roughly bisecting the model (easting of 1,856,150 ft), is shown inFigure 5-18, and reinforces the character of soil architecture observed on the east-west cross sections.Again, the most salient features of the architecture are the occurrence of larger, connected sand lenses inthe upper and southern part of the section, isolated sand lenses at depth, and the tendency for the sandlenses to become smaller and more isolated to the north. Sandy-silt and silt are most common in thelower part of the section, especially to the north. The continuity of the sand body north-to-south and itsposition in the upper part of the stratigraphic section, together with the position of OU 12 on the ancestralWeber River delta, suggests barrier or foreshore beach deposits underlain by lagoonal or possibly deltafront deposits (note the increasing thickness of the vadose zone to the north).The modeled architecture has apparent implications for DNAPL movement through the vadose zone andultimately to groundwater at OU 12. Based on the results of the Wireline soil sampling demonstration, itis unlikely that free-phase DNAPL is migrating to groundwater. Instead, it is probable that surface waterinfiltrates and percolates through the vadose zone, passing through regions of contaminated soil. As ittravels through these zones, contaminant in the soil dissolves into the percolating water and is transportedto groundwater. Gravity is thus the main force driving dissolved contaminant mass through the vadosezone, and the preferred migration pathways are through higher permeability sands, such as the inferredbeach deposits in the upper part of the vadose zone. Capillary forces, however, also wield influence onthe movement of percolating water. When lower permeability materials are encountered migrationpathways are deflected, and the fluid seeks to establish routes with the least capillary resistance. At OU12, the vertical pathways are likely to be tortuous, because there are no large sand bodies spanning theentire thickness of the vadose zone; the larger sand bodies occur in the upper reaches of the vadose zoneand are better connected laterally than vertically.March 2003 5-22 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
Page 16 and 17: Hill Air Force BaseUtahRIVERDALEWeb
Page 18 and 19: Co-Team LeaderCo-Team LeaderURS Pro
Page 20 and 21: 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 68 and 69: 4620WE460045804560454045204500Verti
Page 70 and 71: 4620WE460045804560Elevation (ft)454
Page 72 and 73: Volumetric calculations yield an es
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
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U12-VP1 50 mg/kg source 10 ft thick
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5 10 15 20 25 30 35 40 455 10 15 20
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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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