Source Zone Delineation Demonstration Report - Triad Resource ...

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Figure 7-1. Iso-concentration surface of the 100 µg/kg TCE contamination in soil constructed using 599 wireline soil samplesfrom 16 borings.March 2003 7-4 OU 12 Demonstration ReportFinal
with a measured TCE concentration greater than 10,000 g/kg. During the analysis of samples collectedfrom U12-1807, four samples (30 to 33 feet bgs) were observed to contain LNAPL. In addition, twosamples (27 to 29 feet bgs) from U12-1804 were observed to contain LNAPL.Based on the results of the TCE soil model, contamination in the vadose zone at OU 12 has a distinctlylayered character. Individual layers are elliptical in plan-view, approximately 5 to 10 feet thick, severalhundreds of square feet in areal extent, and are present over most of the entire thickness of the vadosezone within the modeled region. The layers of TCE contamination tend to reside in silty-sand soils,joined vertically by narrow and tortuous throat-like connections evocative of migration pathways. Thisspatial pattern of TCE contamination in soil suggests that water, percolating downward under the force ofgravity and carrying with it dissolved TCE, spreads laterally when it encounters capillary barriers.Pathways through the barriers are ultimately found, providing the contaminated water with a new avenuefor downward percolation.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 7-2. 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. There does not appearto be an appreciable DNAPL phase present in the investigative area of the vadose zone at OU 12. This isillustrated in Figure 7-3 where the NAPL dilution factor is shown as a function of TCE sampleconcentration for various conditions considered representative of the OU 12 vadose zone. The dilutionfactor (as defined in Jackson and Mariner, 1995) represents a measure of how much more concentratedthe contaminant mass must be before a NAPL would be predicted to exist in the sample. Calculationswere performed assuming 30% porosity and for moisture contents ranging from 5 to 20% and a fractionalorganic carbon (f oc ) value of 0.001 mg/mg and 0.002 mg/mg. Under these conditions, the NAPLsaturation limit ranges from approximately 300 mg/kg to 450 mg/kg TCE and is dependent on thefractional organic carbon content of the soil. Based on the results of the SVE modeling, soilconcentrations may be closely approaching the saturation limit where DNAPL is expected to exist;however, TCE concentrations observed during the Wireline CPT soil investigation were closer to the 100mg/kg to 200 mg/kg range. Thus, it is likely that the major TCE contamination is associated with asorbed fraction and probably a separate LNAPL phase identified during the Wireline CPT soilinvestigation.March 2003 7-5 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
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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
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 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 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,
Page 174 and 175: U12-PV1Source Area #2TCE Concentrat
Page 176 and 177: U12-PV1Source Area #2250VP1 i=24, j
Page 184 and 185: 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 #1TCE Concentrat
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TCE Concentration (ppmv1,4001,2001,
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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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