Source Zone Delineation Demonstration Report - Triad Resource ...

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1.4 Report OrganizationThe remaining sections of this report are organized as follows:Section 2.0 provides a summary of the OU 12 site, including a description of the suspectedcontaminant source and the vadose zone stratigraphy.Section 3.0 summarizes the Wireline CPT technical approach, field implementation, and DSITMSsoil analytics.Section 4.0 summarizes the SVE technical approach, field implementation, and DSITMS vaporanalytics.Section 5.0 presents the results of the Wireline CPT soil sampling and SVE demonstration.Section 6.0 provides a cost comparison between conventional vadose zone investigationmethodologies and the technologies demonstrated as part of this project.Section 7.0 presents conclusions and recommendations based on the results of the demonstration.March 2003 1-6 OU 12 Demonstration ReportFinal
2.0 SITE DESCRIPTIONThis section provides a summary of the OU 12 site. Several environmental investigations have beenconducted at the OU 12 site (formerly part of OU 5), including CPT investigations, aquifer testing,groundwater and soil sampling, hydraulic flow and contaminant transport modeling, and two active soilgassurveys.2.1 Site DescriptionThe OU 12 site is located in the northwestern region of Hill AFB, near the western boundary of the Base(see Figure 1-1). Environmental investigations at OU 5 in 2000 identified contamination beneath the Cityof Roy. This plume (above the maximum contaminant level [MCL] of 5 g/L) and the on-Basecontamination were designated as OU 12 in October 2001 [MWH, 2002b]. The primary contaminant ofconcern in the groundwater at OU 12 is TCE. Other contaminants of concern at OU 12 include cis-1,2-dichloroethene (cis-1,2-DCE), carbon tetrachloride, and tetrachloroethene (PCE).The on-Base portion of OU 12 is located just inside of the Base perimeter fence and west of the MissileAssembly Maintenance and Storage-2 (MAMS-2) area. The area of activity consists of relatively flat,unpaved open space dominated by sagebrush and rabbit brush. Remnants of a former WastewaterTreatment Plant are located in the southeastern part of the site. Debris is scattered across the site,including several rusted-through half-buried drums, abandoned foundations, and various small metallicobjects. Several trench-like features also are present in the area.2.2 Suspected Contaminant SourceAlthough the source of the TCE groundwater plume at OU 12 had not been identified, a soil-gas surveyindicated the suspected source area is northwest of the former Wastewater Treatment Plant. Additionally,increasing and/or highly variable TCE concentrations in monitoring well U9-16-011 indicated acontinuing source in the area north of the former Wastewater Treatment Plant [MWH, 2002a]. A welldelineatedTCE groundwater plume emanates from the suspected source zone at OU 12 as shown inFigure 2-1. The local groundwater flow direction is to the west, towards the town of Roy, Utah and theGreat Salt Lake. The TCE groundwater plume extends down gradient approximately 8,000 feet;variations in plume width from origin to terminal end-point are small (average width of approximately500 feet). From plume origin terminus, depth to the plume varies from approximately 85 feet bgs (at theorigin) to approximately 4 feet bgs in the area of monitoring well U5-1143 off Base. Concentrations ofTCE as high as 1,300 g/L have been detected off Base at monitoring well U5-1112 [MWH, 2002a].Within the suspected source zone, depth to groundwater is approximately 70 feet bgs.Prior to this project, attempts to locate and delineate the spatial distribution of the suspected TCE sourcezone have been minimal (with the exception of the recent soil-gas survey). However, indirect evidencestrongly supported the possible presence of a TCE source zone within the vadose zone (primarily) andthe capillary fringe (secondarily) underlying the OU 12 site. This indirect evidence suggests that TCE isMarch 2003 2-1 OU 12 Demonstration ReportFinal
Page 1 and 2: FinalSource Zone Delineation Demons
Page 3 and 4: EXECUTIVE SUMMARYThis report docume
Page 5: The SVE demonstration conducted in
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 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
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
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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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