Source Zone Delineation Demonstration Report - Triad Resource ...

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The SVE system included piping from the extraction well to a demister tank (called the “wet side” on thefield logs) and from the demister tank through the rotometers (called the “dry side” on the field logs) intothe blower intake. A demister tank was plumbed into the system in the event that water entrained in thevadose zone was vacuumed to the surface. Sample ports were located on both the wet side and the dryside of the demister tank. Air samples were collected from the wet side of the SVE system to eliminatethe potential for TCE to partition to any accumulated water contained in the demister tank resulting inartificially low TCE concentrations measured in the extracted vapor. In the event water was conveyed tothe surface, samples would have been collected from the wet side and dry side for comparison purposes.However, water was not encountered during the vapor extraction operations conducted at the OU 12 siteduring the demonstration. The demister tank was eventually removed during extraction at U12-VP5when the vacuum relief valve on the demister malfunctioned at a vacuum of 77 inches of water measuredat the blower. The demister tank was removed and the SVE process system was re-plumbed with PVCpipe.Measurements of the effects of SVE on the subsurface were conducted through use of rotometers formeasurement of air flow at the extraction well head, use of a vacuum gauge for measurement of vacuumat the well head, and use of differential pressure gauges for measurement of vacuum induced at themonitoring wells. A process and instrumentation diagram of the SVE process system is shown in Figure4-5. The field-portable SVE process system, extraction/monitoring probe completions, and DSITMS withair module are shown in Figure 4-6. Table 4-2 provides a summary of the instrumentation utilized duringthe SVE demonstration at the OU 12 site. Prior to field operations, the SVE process system was checkedunder pressure and vacuum for leaks.Two blowers were used separately to induce airflow from the extraction well and produce a response atthe monitoring wells. The first blower was a 1 horsepower REGENAIR TM blower with a rated (atstandard temperature and pressure) free airflow of 92 cubic feet per minute (cfm) and a maximumvacuum of 48 inches of water. This blower was used to sweep vapor from relatively small volumes of thevadose zone to produce chemical data that serve as input to the numerical model. This blower allowedoperation at low vacuum that was increased in steps until the pneumatic permeability of the affected areacontrolled the blower operation. Initially, the air dilution valve was opened to the atmosphere at the startof the operation and the blower was operated at minimum vacuum. The air dilution valve was closed insmall increments (steps) and the vacuum/flow was recorded in the SVE header. Eventually, the dilutionvalve was closed to the atmosphere and full available vacuum (discounting pressure losses in the pipesand the well) was applied to the vadose zone. The step test was continued at higher vacuum and flowusing a second 3 horsepower REGENAIR TM blower whose capacity at standard temperature and pressurewas rated at a flow of 147 cfm and a vacuum of 90 inches of water. Prior to the start of each step test atthe soil vapor extraction points, a low-flow (approximately 200 ml/min) sample pump was used toextraction the soil gas in the immediate vicinity of the well. The sample pump also was used near thecompletion of each step test to evaluate TCE rebound during periods when the blower was shut down. Asummary of the step tests conducted at each soil monitoring/extraction location is shown in Table 4-3.March 2003 4-7 OU 12 Demonstration ReportFinal
PI TI2" DIAM. SVE HEADERBVFROM SVE WELLHFI: HIGH FLOW INDICATORLFI: LOW FLOW INDICATORPI: PRESSURE INDICATORTI: TEMPERATURE INDICATORDAV: DILUTION AIR VALVER: REDUCERBV: BALL VALVEBUTTERFLY VALVEGATE VALVESAMPLEPORTCLEAN-OUTVACUUM RELIEF VALVEDEMISTERLFI HFIBVDRAIN VALVEPITIDAV (1")SAMPLE PORTDAV (1/2")TO ATMOSPHEREPIBLOWERSoil Vapor Extraction SystemProcess & Instrumentation DiagramOperable Unit 12 (OU 12)Hill Air Force Base, UtahFIGURE 4-5March 2003 4-8 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 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 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 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
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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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