Source Zone Delineation Demonstration Report - Triad Resource ...

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5.0 RESULTS OF SOIL SAMPLING AND SVE DEMONSTRATIONThe results from the Wireline CPT soil sampling and SVE demonstrations conducted in the suspectedsource zone at OU 12 are described in this section.5.1 OU 12 Soil Data EvaluationDuring the nine working days of Wireline CPT soil sampling, 599 soil samples were collected from 16discrete push locations (see Figure 5-1). The depth profiles generated based on the TCE soilconcentration data are shown in Figures 5-2 and 5-3 for concentrations less than 350 g/kg and greaterthan 1,000 g/kg, respectively. The analytes PCE, DCE, and vinyl chloride were below the projectreporting limits in all soil samples analyzed. A summary of the soil sampling results obtained during theWireline CPT demonstration is shown in Table 5-1.Samples were collected using either distilled water or methanol as an extractant and analyzed accordingto US EPA Method 8265 (see Section 3.3). During the analysis of samples collected from U12-1807,four samples (30 to 33 feet bgs) were observed to contain a light nonaqueous phase liquid (LNAPL) asshown in Figure 5-4. In addition, two samples (27 to 29 feet bgs) from U12-1804 were observed tocontain a LNAPL. With the exception of U12-1817, distilled water was used as the extractant during theWireline CPT demonstration; thus, it is surmised that the measured TCE concentrations in samplescontaining LNAPL from U12-1804 and U12-1807 are biased low due to incomplete extraction associatedwith the preferential partitioning of the TCE into the LNAPL. Methanol was used as the extractant forthe analysis of soil samples collected from U12-1817, located approximately 10 feet southeast of U12-1804 and adjacent to the excavated drum area. Based on the TCE concentrations observed at U12-1817,an LNAPL/water partitioning factor of approximately 10 was estimated. This factor was used to adjustthe TCE soil concentration of two samples (15,400 g/kg at 27 feet bgs and 7,300 g/kg at 29 feet bgs)collected at U12-1804 and one sample (14,400 g/kg at 33 feet bgs) collected at U12-1807.Inference of the magnitude and spatial extent of TCE contamination in the vadose zone at OU 12 wasaccomplished using three-dimensional modeling of TCE concentration measured in soil samples retrievedwith a the Wireline CPT sampler. Iterative, short-delay modeling of the extent of contamination (themodel was expeditiously revised whenever new data were received from the field) provided fieldpersonnel with guidance for selecting new wireline sampling locations. The relationship between TCEcontamination and soil type was investigated with the benefit of three-dimensional modeling of thearchitecture of the main soil types in the vadose zone, based on CPT data acquired during previousinvestigations at OU 12.All three-dimensional subsurface modeling performed in this investigation was performed using thekriging and visualization algorithms available in the EVS-Pro software system (CTECH, 2002). Ordinarykriging (Isaaks and Srivastava, 1989; Gooevaerts; 1997) was used to model TCE contamination, whereasindicator kriging (Isaaks and Srivastava, 1989; Gooevaerts; 1997) was used to model the distribution ofsoil types.March 2003 5-1 OU 12 Demonstration ReportFinal
Site-wide Model DomainU5-1911U5-1913U5-1098U5-1005DETAIL AREAU5-1910U5-1912U5-1914U12-1802U5-1824U5-1895U5-1823U5-1822U5-1826U5-1896U5-1825U5-1894U9-16-011U5-1903U5-1904U5-1898U5-1909U5-1099U5-1908U5-1893U5-1892U5-1902U5-1901U5-1915U5-1916TCE in Soil andCombined Soil/TCEModel DomainsOU 12 TCE Plume (5 ug/L)U5-1821U5-1917U5-1918U5-1891 U5-1899U5-1905U5-1906U5-1890U5-1900U5-1889U9-16-027U5-1888FormerWastewaterTreatmentPlantDavis-Weber CanalHAFB Boundary2nd StreetU5-1827U5-1820U5-1819U5-130U5-1828U5-1829U5-1886U5-1885U5-1875U5-1887U5-1884 U5-1883U5-1876 U5-1877U5-1879U5-1878U5-1880U9-16-026U5-1874 U5-1873 U5-1872 U5-1871 U5-1881U5-1867U5-1882U9-16-025Plume (5 ug/L)OU 5 Zone 16 TCE Plume (5 ug/L)U9-16-029U5-1123U5-1007U5-1868U5-1869U5-1870U9-16-832U12-1812U12-1814U12-1815U12-1806U12-1816U12-1813U12-VP5U12-VP720 0 20 40Soil Vapor Extraction (SVE) BoringWireline Sampler BoringFeetU12-VP2U12-VP1U12-VP4U12-VP3U12-1803U12-1808U12-1807U12-1804U12-1817U12-1811U12-1810U12-VP6U12-1809U12-1805Extent in Plan View of 3D SoilTCE Iso-concentration Surfaces1,000 ug/kg10,000 ug/kg100,000 ug/kgApproximateLocation ofExcavatedBarrels100 0 100 200FeetSoil Gas Sampling LocationMonitoring WellLocation and Extent of Modeling Domains andSVE and Wireline Sampler Boring LocationsOperable Unit 12 (OU 12)Hill Air Force Base, UtahFIGURE 5-1March 2003 5-2 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 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 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
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
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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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