Source Zone Delineation Demonstration Report - Triad Resource ...

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A comparison between the predicted and the measured TCE concentration profile in the vapor phase wasconducted using the three-dimensional distribution of TCE in the subsurface at OU 12 developed usingthe EVS-Pro software system (CTECH, 2002) and based on the data collected during the Wireline CPTsoil sampling investigation. Since the EVS modeling domain used to develop the distribution of TCE insoil is different than the VENT3D modeling domain, an orthogonal (x,y) grid was created in EVS thatwas coincident with the grid in VENT3D. Once the orthogonal grid was created, two EVS models werebuilt. The first model consisted of 14 layers with each layer five feet thick and was identical to theVENT3D grid. The ASCII output from EVS was then reformatted for use in VENT3D. The averagevalue was used for each layer because the original EVS model was based on vertical layers of two feet inthickness and not five feet as was used in the VENT3D model for the soil vapor simulations. Using avertical grid spacing of five feet in EVS rather than two feet results in additional vertical averaging.Thus, the maximum TCE concentration in VENT3D (38.9 mg/kg) is much lower than the maximum TCEconcentration in the original EVS soil model (100 mg/kg).To address the issue of vertical averaging, a second EVS soil model was created and consisted of 70layers with each layer one foot thick. To generate the TCE concentration at each node (x,y,z) of theVENT3D model, the output from the 70 layer EVS model was segregated into 14 layer-groups of fivelayers each with each group spanning five feet The maximum TCE concentration at the specified x and ycoordinate within each group for each layer was used as the TCE concentration for each VENT3D node.For example, for layer 2 in VENT3D, the maximum at each x and y coordinate was selected from EVSlayer-group 2, which consisted of EVS layers six through ten. Thus, the maximum TCE concentration inVENT3D is consistent with the original EVS model.The EVS transformed TCE source configuration is referred to as source area 10 for the VENT3Dsimulations. The distribution of TCE in the soil for the bottom 12 layers (i.e., 10 to 70 feet bgs) of theEVS average layer model and the EVS maximum layer model is shown in Figures 5-50 and 5-51,respectively. As is apparent from the figures, the vertical averaging required to transform the 2-footlayers from EVS into 5-foot layers for use in VENT3D resulted in lower overall TCE soil concentrationsas well as a smaller distribution of TCE within the modeling domain as that generated with the EVSmaximum layer model transformation.A comparison between the predicted and the measured TCE concentration profiles in the vapor phase atall seven extraction wells for source area 10 is shown in Figures 5-52 and 5-53. The main difference inthe predicted TCE vapor concentrations between the EVS average layer model (Figure 5-52) and the EVSmaximum layer model (Figure 5-53) occurs for extraction wells U12-VP1, U12-VP2, and U12-VP4. Thepredicted vapor concentrations at these particular extraction wells are significantly higher for the EVSmaximum layer model due to the higher soil concentrations and the close proximity of these wells to thesuspected source. However, most notable is that for both concentration scenarios (EVS average layer andEVS maximum layer), the predicted response is significantly different than the actual measured responseat all seven extraction wells.March 2003 5-79 OU 12 Demonstration ReportFinal
5 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 4545Layer 14565 to 70 feet bgs45Layer 24560 to 65 feet bgs45Layer 34555 to 60 feet bgs45Layer 44550 to 55 feet bgs4040404040404040U12-VP3U 12-VP3U12-VP3U12-VP335353535353535353030303030303030U12-VP5U12-VP5U12-VP5U12-VP525U12-VP2U12-VP62525U12-VP2U12-VP62525U12-VP2U12-VP62525U12-VP2U12-VP6252020202020202020U12-VP1U12-VP1U12-VP1U12-VP11515151515151515U12-VP7U12-VP7U12-VP7U12-VP7U12-VP4U12-VP4U12-VP4U12-VP410101010101010105 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 4545Layer 54545 to 50 feet bgs40404545Layer 640 to 45 feet bgs404045Layer 74535 to 40 feet bgs404045Layer 84530 to 35 feet bgs4040U12-VP3U12-VP3U12-VP3U12-VP335353535353535353030303030303030U12-VP5U12-VP5U12-VP5U12-VP525U12-VP2U12-VP62525U12-VP2U12-VP62525U12-VP2U12-VP62525U12-VP2U12-VP6252020202020202020U12-VP1U12-VP1U12-VP1U12-VP11515151515151515U12-VP7U12-VP7U12-VP7U12-VP7U12-VP4U12-VP4U12-VP4U12-VP410101010101010105 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 4545Layer 94525 to 30 feet bgs40404545Layer 1020 to 25 feet bgs404045Layer 114515 to 20 feet bgs404045Layer 124510 to 15 feet bgs4040U12-VP3U12-VP3U12-VP3U12-VP335353535353535353030303030303030U12-VP5U12-VP5U12-VP5U12-VP525U12-VP2U12-VP62525U12-VP2U12-VP62525U12-VP2U12-VP62525U12-VP2U12-VP6252020202020202020U12-VP1U12-VP1U12-VP1U12-VP11515151515151515U12-VP7U12-VP7U12-VP7U12-VP7U12-VP4U12-VP4U12-VP4U12-VP410101010101010105 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 455 10 15 20 25 30 35 40 45Figure 5-50. Contours of TCE soil concentrations (µg/kg) for source area 10 using the EVS average layer model.March 2003 5-80 OU 12 Demonstration ReportFinal555555555555555555555555
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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
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Davis-Weber CanalDetail AreaHillAir
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ANorthSouthU5-18864,580CROSS SECTIO
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Approx. LocationOf BarrelsInitial S
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Figure 3-2. Wireline locking and re
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3.3 DSITMS Soil AnalyticsDirect sam
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4.0 SOIL VAPOR EXTRACTION DEMONSTRA
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The equilibrium four-phase distribu
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3520 ft. from well, 3.5 cfmTCE in E
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The SVE system included piping from
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SVE Process System and On-Site DSIT
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Table 4-3. Summary of OU 12 SVE Ste
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3,000U12-VP1 Calibration Curve2,500
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5.0 RESULTS OF SOIL SAMPLING AND SV
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0U12-1802100U12-1803100U12-18051020
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0102030405060700U12-1804U12-1807102
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Figure 5-4. Soil samples collected
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298400298360Northing (ft)2983202982
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298400298360Northing (ft)2983202982
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The final TCE soil contamination mo
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298400298360Northing (ft)2983202982
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Figure 5-12. Isometric view, lookin
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An isometric view of the upscaled a
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March 2003 5-21 OU 12 Demonstration
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4620WE460045804560454045204500Verti
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4620WE460045804560Elevation (ft)454
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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
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
Page 122 and 123: U12-VP1 200 mg/kg source 10 ft thic
Page 126 and 127: 5 10 15 20 25 30 35 40 455 10 15 20
Page 128 and 129: U12-VP1 EVS Maximum Soil Concentrat
Page 130 and 131: 9,200Predicted TCE Concentration (p
Page 132 and 133: 6.1 Conventional Sampling and Analy
Page 134 and 135: Table 6-2. Estimated Cost for OU 12
Page 136 and 137: 6.1.2 Direct Push Technology (DPT)T
Page 138 and 139: Table 6-4. Estimated Cost for OU 12
Page 140 and 141: that the Wireline CPT sampler canno
Page 142 and 143: Table 6-5. Summary of Estimated Cos
Page 144 and 145: The Wireline CPT tool is not effect
Page 146 and 147: Figure 7-1. Iso-concentration surfa
Page 148 and 149: 24U12-VP5 Combined Testing201612846
Page 150 and 151: 8.0 REFERENCESBear, J. 1979. Hydrau
Page 152 and 153: TABLE A-1FIELD ANALYICAL RESULTS FO
Page 170 and 171: APPENDIX BSimulated TCE Vapor-Phase
Page 172 and 173: 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 (ppmv4,9004,8004,
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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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