Source Zone Delineation Demonstration Report - Triad Resource ...

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Figure ES-1. Iso-concentration surface of the 100 µg/kg TCE contamination in soil constructed using 599 wireline soil samplesfrom 16 borings.March 2003 ES-2 OU 12 Demonstration ReportFinal
The SVE demonstration conducted in the suspected source zone at OU 12 focused on step tests forestimating TCE distribution within the vadose zone of the investigative area using a multiphase,multicomponent numerical model. The concentration of TCE in time was monitored on one-secondintervals via the on-site laboratory using DSITMS, resulting in over 66,000 data. The TCE time-seriesdata collected during the demonstration were compared with simulated time-series data using a theoreticaldistribution of TCE mass in the zone of influence and a sequential forward numerical modeling scheme inan attempt to help delineate source-zone contamination in the vadose zone of the investigative area.Although the step tests were optimized to assess contaminant distribution within the vadose zone of theinvestigative area, the data also provide an indication of the pneumatic response of the subsurface at OU12 during vapor extraction operations. Based on a maximum radial extent of induced subsurface vacuumof 0.01 inch of water, the zone of pneumatic influence observed during the OU 12 SVE demonstrationranged from approximately 50 to 80 feet in the southern section of the investigative area to over 100 feetin the northern section. The average zone of pneumatic influence within the investigative area wasapproximately 85 feet. The average in situ air permeabilities observed during vapor extraction operationsis typical of the fine-grained material in the vadose zone at OU 12 and ranged from 5 to 20 Darcy with ageometric mean of approximately 10 Darcy.Over 160 theoretical source configurations were simulated numerically during the demonstration. Thebest correlation between the predicted and measured TCE vapor-phase concentration profile was obtainedusing a theoretical TCE source located approximately 8 feet northwest of U12-VP1 and 19 feet southeastof U12-VP2. This source was assumed to be 5 feet by 5 feet in areal extent, 10 feet thick, and containing400 mg/kg TCE. For this source configuration, the predicted vapor-phase concentrations and the generalconcentration profiles were in relatively good agreement for five of the seven extraction wells butsignificant differences were observed for two wells distant from the assumed source location. In addition,the predicted TCE concentration profiles for U12-VP1 and U12-VP2 did not exhibit the characteristicexponential decline that was observed in the measured concentrations during periods of blower shutdown.The vapor-phase concentration of TCE observed during SVE operations at OU 12 closely correlate withthe spatial distribution of the TCE soil contamination as shown in Figure ES-2. The highest TCE vaporconcentration was observed at U12-VP1 located approximately 20 feet west of the southern end of thedrum excavation area. The maximum concentration of TCE in the extracted vapor from this location wasapproximately 1,150 ppmv. The next highest concentration of TCE was observed at U12-VP2, locatedapproximately 35 feet north of U12-VP1 and 20 feet west of the north end of the drum excavation area.The maximum concentration of TCE in the extracted vapor at U12-VP2 during testing was approximately500 ppmv. The concentration of TCE in the extracted vapor from the other five wells was less thanapproximately 100 ppmv during vapor extraction operations.Although a final source configuration was not obtained with the sequential forward modeling scheme, theSVE modeling did suggest that the highest levels of soil contamination are located near the top of thescreened intervals of U12-VP1 and U12-VP2. Based on the results of the model, it is inferred that themajor source of TCE contamination is located in the upper portion of the vadose zone (20 to 35 feet bgs)offset slightly to the east of U12-VP1 and moderately more distant from U12-VP2. Based on the resultsof the SVE modeling, soil concentrations may be closely approaching the saturation limit where a denseMarch 2003 ES-3 OU 12 Demonstration ReportFinal
Page 1 and 2: FinalSource Zone Delineation Demons
Page 3: EXECUTIVE SUMMARYThis report docume
Page 8 and 9: TABLE OF CONTENTSEXECUTIVE SUMMARY
Page 10 and 11: LIST OF FIGURESFigure ES-1 Iso-Conc
Page 12 and 13: Figure 5-38 Horizontal slices at fi
Page 14 and 15: 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
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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
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The position of the water table in
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5.2 OU 12 SVE EvaluationThe OU 12 S
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Vapor Probe #1Vapor Probe #2Vapor P
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Thus, the in situ air permeability
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0.0000-0.0010U12-VP1 ResponsePressu
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0.000020.00000U12-VP1 ResponsePress
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Table 5-5. Estimated In Situ Air Pe
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10.0U12-VP1 Pneumatic Response8.0Ai
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1,400841,20072TCE Concentration (pp
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800.98700.84TCE Concentration (ppmv
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200.018180.016TCE Concentration (pp
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1400.491200.42TCE Concentration (pp
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4600OU12-VP1OU12-VP2 OU12-VP3 OU12-
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the screened interval in U12-VP1 an
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permeability layer. Final adjustmen
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Table 5-7. Comparison of Measured a
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Table 5-8. continuedFile Name Extra
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U12-1802U12-VP3U12-1812U12-1803U12-
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U12-1802U12-VP3U12-1812U12-1803U12-
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U12-1802U12-VP3U12-1812U12-1803U12-
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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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