Source Zone Delineation Demonstration Report - Triad Resource ...

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25 – 30 feet bgs30 – 35 feet bgs35 – 40 feet bgs40 – 45 feet bgs5 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 454545 45454545 45Before Before Before Before4040 40404040 40U12-VP3U12-VP3U12-VP3U12-VP33535 35353535 353030 30303030 30U12-VP5U12-VP5U12-VP5U12-VP525U12-VP2U12-VP625 25U12-VP2U12-VP62525U12-VP2U12-VP625 25U12-VP2U12-VP62020 20202020 20U12-VP1U12-VP1U12-VP1U12-VP11515 15151515 15U12-VP7U12-VP7U12-VP7U12-VP7U12-VP4U12-VP4U12-VP4U12-VP41010 10101010 10555 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 45454545454545 45After After After After404040404040 40U12-VP3U12-VP3U12-VP3U12-VP3353535353535 35303030303030 30U12-VP5U12-VP5U12-VP5U12-VP525U12-VP2U12-VP62525U12-VP2U12-VP62525U12-VP2U12-VP625 25U12-VP2U12-VP6202020202020 20U12-VP1U12-VP1U12-VP1U12-VP1151515151515 15U12-VP7U12-VP7U12-VP7U12-VP7U12-VP4U12-VP4U12-VP4U12-VP4101010101010 10555 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 5-47. Predicted TCE soil gas concentration (ppmv) prior to and following soil vapor extraction from U12-VP2 for source area 7 and 25,000 mg/kg original concentration with a 30-year diffusion period.March 2003 5-75 OU 12 Demonstration ReportFinal45403530252015104540353025201510555555555555
vapor extraction does not significant reduce the predicted soil concentration, the concentration contoursare considerable perturbed (see Figure 5-46). Similar results are observed for the predicted concentrationof TCE in the soil gas, especially for depths below 30 feet bgs (see Figure 5-47). This perturbation in thenatural distribution of TCE in both the soil and the soil gas may have influenced the observed TCEconcentration profiles during the step tests conducted at OU 12 near the end of the demonstration,following several days of vapor extraction from the relatively small investigative area.A comparison between the predicted and the measured TCE concentration profiles in the vapor phase atextraction well U12-VP1 for source area 9 is shown in Figure 5-48. Source area 9 is locatedapproximately 8 feet northeast of U12-VP1, and represents a simulated TCE source 5 feet by 5 feet inareal extent and 5 to 10 feet thick. An initial source concentration ranging from 5,000 to 40,000 mg/kgprior to a 15-year or 30-year diffusion period and from 200 to 10,00 mg/kg without diffusion wasinvestigated. Without a pre-extraction diffusion period, the predicted concentration profiles show a sharpincrease in TCE concentration with increased time. This sharp increase in TCE concentration also wasobserved in the measured concentrations during the SVE demonstration at OU 12. Assuming a 5-footthick source zone located at 25 to 30 feet bgs, the predicted TCE concentration profile in the vapor atU12-VP1 becomes independent of soil concentration above 1,000 mg/kg and never rises aboveapproximately 450 ppmv in the vapor phase during the simulated test period. In addition, theconcentration profiles appear relatively linear without the characteristic exponential decline observed inthe measured concentration profiles during the blower shutdown periods. The TCE concentration profilespredicted for the 15-year and 30-year diffusive period scenario do not match the actual profiles obtainedduring the SVE demonstration and appear to resemble a localized, diminishing source or a diffusiondominatedflow regime. Assuming a 10-foot thick source zone containing 400 mg/kg and no preextractiondiffusion, the predicted TCE vapor concentrations at U12-VP1 are in very good agreementwith the measured values; however, during periods of blower shutdown, the predicted concentrationprofiles become relatively flat and do not exhibit the characteristic exponential decline. As extractionoperations are continued following the blower shutdown period, the predicted vapor-phase concentrationssharply decline, apparently from streamtube dilution. This effect was not observed during actual vaporextraction operations at U12-VP1.Although the exponential decline in the concentration of TCE in the vapor phase during blower shutdownperiods was not predicted for a 10-foot thick source containing 400 mg/kg TCE in source area 9, thepredicted concentrations were in good agreement with the measured values for U12-VP1. Thus, acomparison between the predicted concentrations of TCE in the vapor phase with the actual measuredvalues was conducted for all seven extraction wells for this source zone configuration and is shown inFigure 5-49. Although the predicted vapor-phase concentrations and the general concentration profilesare in relatively good agreement for U12-VP1, U12-VP2, U12-VP4, U12-VP5, and U12-VP7, there aresignificant differences between the predicted and measured profiles for U12-VP3 and U12-VP6. Forinstance, the measured concentration of TCE in the vapor phase at U12-VP3 increased from a few partsper-millionby volume to approximately 65 ppmv with increased vapor extraction rates before sharplydecreasing during blower shutdown. However, the concentration of TCE in the vapor phase is predictedto be near zero with no observed increase or decrease for all simulated rates of vapor extraction.March 2003 5-76 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
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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
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
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 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
Page 152 and 153: 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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