Source Zone Delineation Demonstration Report - Triad Resource ...

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permeability layer. Final adjustment of the permeability value for each layer was made based on thevacuum distribution match between the model results and actual field measurements.The six vapor extraction/monitoring wells were located in the modeling domain and screened within threegrid-blocks in the z-direction for nominal 15-foot well screens and four grid-blocks for nominal 20-footwell screens. Multiple stress periods were simulated according to the vapor extraction operationsconducted at each individual vapor extraction well. The first stress period consisted of 10, 20, or 30 yearsof no-flow at the extraction well to simulate the natural transport of TCE in the vapor phase via diffusionand corresponds to a source spill or creation date of 1992, 1982, or 1972, respectively. Following thediffusive transport period, simulations were conducted using the various flow regimes investigated at eachindividual extraction well (see Table 4-3) and using various source configurations (areal extent, depth,concentration, and location). In addition to the simulations conducted with an initial diffusive transportperiod, simulations also were conducted to assess the predicted TCE concentrations in the vapor phase forsource zone architecture in the absence of a pre-diffusion stress period.Due to the vast amount of information obtained from the VENT3D simulation code, several OU 12-specific programs were written to extract the required simulation data (e.g., TCE time-series vaporconcentration, vacuum distribution, and TCE soil distribution) from the VENT3D output file.5.2.3.1 Vacuum DistributionAs discussed above, a simple two-layer permeability field was used for the OU 12 SVE simulations. Thefirst permeability layer was comprised of the bottom 50 feet of the modeling domain (corresponding tothe lower sandy-silt and silty-sand zone) with an assumed permeability ranging from 0.1 to 100 Darcy.The second permeability field was comprised of the upper 20 feet of the modeling domain (correspondingto the upper sandy gravel zone) with an assumed permeability of 5 to 10 times greater than the lowerpermeability layer. The predicted vacuum distribution obtained for layer 6 of the modeling domain(corresponding to 40 to 45 feet bgs) was compared with actual field measurements to arrive at the finalpermeability field. Since the vapor extraction wells were generally screened from 35 to 55 feet bgs andfrom 40 to 60 feet bgs, the 40- to 45-foot interval was selected as representative of the screened intervalof the six extraction/monitoring wells.The best fit between the predicted vacuum distribution and the field measurements were obtainedassuming a permeability of 10 Darcy for the bottom 50 feet of the modeling domain and 100 Darcy forthe upper 20 feet of the domain. Figure 5-39 shows the predicted vacuum distribution at 40 to 45 feet bgsduring vapor extraction from U12-VP2 for 6 hours at 12 scfm for a two-layer permeability field of 10 and100 Darcy. A comparison of the predicted versus measured vacuum distribution at each monitoring wellduring vapor extraction at U12-VP2 is shown in Table 5-7. With the exception of monitoring wells U12-VP4 and U12-VP6, the predicted vacuum was in good agreement with the measured values. For U12-VP4 and U12-VP6, the predicted vacuum was an order of magnitude higher than actually observed duringfield operations.March 2003 5-57 OU 12 Demonstration ReportFinal
5 10 15 20 25 30 35 40 45454540U12-VP340353530U12-VP53025U12-VP2U12-VP62520U12-VP12015U12-VP7U12-VP4151010555 10 15 20 25 30 35 40 45Figure 5-39. Vacuum distribution predicted at 40 to 45 feet bgs during vapor extraction from U12-VP2for 6 hours at 12 scfm assuming a two-layer permeability field (10 and 100 Darcy).March 2003 5-58 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
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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
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 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 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 124 and 125: A comparison between the predicted
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
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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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