Source Zone Delineation Demonstration Report - Triad Resource ...

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The position of the water table in May 2002 is shown on Figure 5-19 for reference. It is about 15 to 20feet lower than the lowest level of the 100 g/kg contour. Although the magnitude of water tablefluctuations over the past several decades are unknown, it seems unlikely they are in the range of 15 to 20feet. Thus the fluctuation of the groundwater surface through soils contaminated with TCE at a levelabove 100 g/kg does not appear to be a mechanism for contamination in the saturated zone, at least atthe location of this particular cross section.Figure 5-20 is a north-to-south vertical cross section at an easting of 1,856,100 feet, and orthogonal toFigure 5-19. The elongate character of contamination is evident. Note the shape of the 100 g/kgbetween northings of approximately 298,250 feet and 298,270 feet, and elevations of about 4540 to 4550feet. This tongue-shaped contour indicates transport to the south, and connects to a previously describedcontour suggesting an easterly component of transport on the east-west cross section at a northing of298,270 feet (see Figure 5-19). Some of the smaller, isolated regions of TCE contamination enclosed bythe 100 g/kg contour may be interpolation artifacts and should be interpreted with discretion (e.g., theregion at an elevation of approximately 4,525 feet between a northing of 298,360 feet and 298375 feet).Clearly connected migration pathways are less visible, although there is an apparent southwardcomponent of migration direction from the main region of contaminated soil.Volumetric calculations of soil type indicate that the proportions of soil types in the combined soil/TCEmodel are very similar to those in the site-wide model. Of the 124,444 yd 3 of soil in the combinedsoil/TCE model, 17% is sand, 53% is silty-sand, 27% is sandy-silt, and 3% is silt. More detailedcalculations describing the relationship between TCE contamination and soil type are summarized inTable 5-4. The calculations are based on the region enclosed by the 10 g/kg iso-concentration surface.30,472 yd 3 , or 24.5% of the model volume, is enclosed by the 10 g/kg iso-concentration surface. Theaverage concentration of TCE within this volume is 131.93 g/kg, yielding a mass of 12.5 lb and avolume of 0.202 ft 3 TCE. The bulk of the TCE is in silty-sand; 21.9% of the silty-sand is contaminatedby TCE at a concentration higher than 10 g/kg, with an average concentration of 343.8 g/kg, for a totalof 10.62 lb TCE (85% of the total). Analogous results for the other modeled soil types are listed in Table5-4.Table 5-4. Distribution of TCE Greater Than 10 µg/kg by Soil TypeSoil TypeVolume(yd 3 )Percent ofSoil-Type(%)TCE Volume(ft 3 )TCE Mass(lb)Average TCEConcentration(µg/kg)Sand 1,124 5.3 0.0013 0.08 34.05Silty-Sand 14,450 21.9 0.1715 10.62 343.80Sandy-Silt 13,895 41.6 0.0275 1.72 57.88Silt 1,003 24.8 0.0013 0.08 38.97TOTAL 30,472 24.5 0.2016 12.50 131.93March 2003 5-29 OU 12 Demonstration ReportFinal
4600SN45804560454045204500298200No Vertical298220298240298260298280298300Northing298320298340298360298380298400Figure 5-20. North-south vertical cross-section through the combined TCE/soil model at an easting of 1,856,110 ft.Elevation (ft)March 2003 5-30 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
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
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 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
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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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