Technical Memorandum – FSDF Source Investigation – Soil ... · Santa Susana Formation; this...

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Technical Memorandum – FSDF Source Investigation – Soil Gas Sampling Progress Report - February 27, 2018

1.0 Background The Former Sodium Disposal Facility (FSDF) was used to remove sodium and potassium metals from metallic objects (e.g., pumps and piping). The removal mechanism involved use of water to react with the liquid metals, primarily within unlined ponds. The FSDF was in use from 1956 to 1978 when the liquid metals treatment of objects was shifted to a more controlled process at the Hazardous Waste Management Facility. Figure 1 shows the location of the FSDF at the western edge of SSFL.

The FSDF consisted of three features: a cement-lined pool and pad where objects were pressure washed and placed in water, an upper unlined pond, and a lower unlined pond (Figure 2). Objects were also placed in the unlined ponds to react with water. The ponds were periodically dredged to remove the cleaned objects. During and after its operational period, the FSDF area was also used to store chemical wastes in drums collected from all over SSFL. Apparently, some of the chemical wastes were released into the ponds.

Starting in 1993, the soil concrete pad and soil associated with the unlined ponds were removed. The ponds were then backfilled with soil removed from the Area IV borrow site, located in the Santa Susana Formation; this soil fill covers the FSDF site today.

Groundwater data collected from wells at the FSDF indicate that the source of volatile organic compounds (VOCs) in bedrock groundwater originates from VOC-impacted near-surface bedrock matrix, located less than approximately 60 feet below ground surface (bgs). A perched groundwater zone in bedrock fractures shallower than 40 feet bgs harbors groundwater impacted by the VOCs 1,1,1-trichloroethane (1,1,1-TCA) and trichloroethene (TCE). The impacted bedrock groundwater is located at approximately 200 feet beneath the perched groundwater zone.

The site conceptual model for the FSDF is that rain water infiltrating the fill comes in contact with bedrock fractures at the soil fill-bedrock interface. The infiltrated groundwater then comes into contact with contaminants that are contained in fractures, typically of a hairline thickness. The Near surface fractures drain into the fracture network pathways that are periodically recharged by seasonal rains and the infiltrated groundwater. At the FSDF, the shallow fractures produce a perched zone groundwater zone. One 40-ft deep bedrock corehole (RS-54) is used to monitor perched groundwater containing the VOCs. RS-54 is located within the footprint of the former lower pond (Figure 2). Historically concentrations of 1,1,1-TCA and TCE have exceeded 10,000 µg/L and 1,000 µg/L, respectively. RS-54 was dry from 2014 through 2016, but it produced water following rains during the 2016-2017 winter season.

2.0 Summary of Soil Gas Investigation Since RS-54 is the only well within the near surface bedrock, the extent of impacted bedrock associated with the former lower FSDF ponds is not known. Therefore, a soil gas investigation was conducted from October 30 – November 17, 2017 to assess the extent of contamination in shallow

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bedrock at the FSDF ponds. The purpose of the investigation was to determine whether VOCs emanating from the bedrock into the fill soil could be used to help identify the extent of impacted bedrock.

The soil gas investigation included two parts. The first was the use of a GeoprobeTM rig equipped with a Membrane Interface Probe (MIP) to identify the presence of VOCs at the soil-bedrock interface. The second part was the use of temporary well casings (well points) fitted with passive soil gas samplers to identify the specific chemicals where the MIP indicated elevated instrument readings. The MIP was connected via a sampling tube to a gas chromatograph (GC) in a support trailer. The GC was equipped with four detectors: an electron capture detector (ECD), a halogen-specific detector (XSD), a photoionization detector (PID), and a flame ionization detector (FID). The ECD and XSD were used to detect halogenated chemicals, the PID was used to detect aromatic chemicals, and the FID was used to detect straight chain hydrocarbons.

The FSDF area was set up in a 25-feet by 25-feet grid as shown in Figure 3. The location of grid row K was mislabeled in the field which was not observed until after MIP borings were started. Therefore, Figure 3 shows the locations and labeling of the row K and L sampling points as were recorded in the field.

The MIP detector used on October 30, 2017 was calibrated for VOC concentrations of 50 parts per million (ppm) or greater. MIP readings produced on October 30 did not indicate the presence of elevated VOCs; therefore, the MIP detector was replaced the following day with a low-level (LL) MIP detector calibrated to measure VOC concentrations of 5 ppm or lower. The five MIP readings performed on October 30 were repeated on October 31 using the LL detector.

Based on areas with elevated LL MIP responses, 20 locations were identified for the installation of 1-inch diameter well points to support the collection of passive soil gas samples. The GeoprobeTM was used to pre-drill a borehole to refusal at the bedrock interface and the well point was inserted into the borehole. The well point was sealed at the surface using a bentonite grout mixture. A passive soil gas sampler using a charcoal absorbent bed was lowered to the bottom of the well point and hung adjacent to the well screen. The sampler was sealed from atmospheric influence by a foam plug. The samplers were left in the well points for a period of 30 to 199 hours (see Table 1). A modified EPA TO-17 analytical method was used by Eurofins/Air Toxics to analyze the samples.

3.0 Results Soil gas sample results are provided in Table 2. Table 3 provides the MIP responses for the ECD, XSD, and PID results0F

1; the FID readings are for straight chain hydrocarbons and are not reported on the table. Table 3 also includes results of the key VOC analytes from the passive soil gas samplers. A review of Table 3 indicates no direct correlations between the MIP responses and soil gas results. Calibration data demonstrates that the MIP was functioning (ASC 2017), and therefore the lack of correlation is not due to malfunctioning MIP detectors. Rather, the lack of correlation is likely because of insufficient release of VOC mass from the bedrock into the soil for the MIP detectors to identify.

1 All MIP data are provided in Table 3 of the report ASC Tech Services 2017. Field Services Report Low-Level Interface Probe®(LL-MIP), Santa Susana Field Laboratory (SSFL) Former Sodium Disposal Facility Area IV, Ventura County California. December 11.

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The MIP operates by using a heated probe that is intended to mobilize VOCs in a soil matrix. The mobilized VOCs are then drawn up into the sampling tube to be detected in the GC. The MIP readings are predicated on having a VOC-contaminated soil matrix that comes in contact with the probe. In the case of the FSDF, it is the bedrock that is contaminated rather than the soil mass (although there may be VOCs in the interstitial soil spaces). The heating of the soil may be counterproductive for pulling VOCs into the MIP inlet as the heat may expand the air and act as a gradient moving VOCs away from the probe. In addition, the MIP probe inlet, which is 1 foot above the tip of the probe, is only inserted for a few minutes, which may not allow sufficient time for VOCs emanating from bedrock to enter the probe.

The passive soil gas samples produced results because the samplers were left in the ground for at least 24 hours. This allowed for sufficient time for VOCs in interstitial spaces to migrate to the sampler and be absorbed onto the sampling media.

Figure 3 illustrates soil gas detections for 1,1,1-TCA and TCE. As shown in this figure, the highest concentrations were detected the vicinity of RS-54, within the footprint of the former lower pond. Near RS-54, 1,1,1-TCA concentrations ranged from 410 to 17,000 µg/m3, and TCE concentrations ranged from 670 to 3,900 µg/m3. Elevated TCE concentrations, ranging from 71 to 570 µg/m3, were also observed near the former cement-lined pool, located at the south end of the upper pond.

4.0 Conclusions and Recommendations The soil gas results identify locations where the edge of VOCs emanating from bedrock has not been defined. A second round of soil gas sampling is recommended to define edges of the vapor plumes. Use of the MIP during this second phase is not proposed given the issues discussed above. The soil gas results should also be used as one line of evidence for installation of shallow coreholes drilled to collect core for VOC presence and to assess interconnectivity of the shallow bedrock fractures.

FIGURE 1 Location of FSDF in Western Area IV

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LEGEND

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OC:\_projects\SantaSusana\GIS\MXD\Groundwater\RI\SSFL_GWRI_GW_Seeps_20170309.mxd

0 1,000500Feet

Notes:- Original GIS layers provided by MWH/Boeing; updated by CDM Smith as needed.

Service Layer Credits:- Aerial Source: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX,Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User Community.

FIGURE 2 Former Sodium Disposal Facility (FSDF) Layout

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RD-54A3.1

RS-181.2

C-081

PZ-102

PZ-098

PZ-097

PZ-100PZ-101

RS-54

RS-23

RD-57

PZ-099

RD-150

RD-22ND

RD-50ND

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SP-900BSP-900C

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OC:\_projects\SantaSusana\GIS\MXD\Groundwater\RI\SSFL_GWRI_FSDF_Layout_20170306.mxd 3/6/2017


* - Leach Fields labeled using unique ID (AI-Zxx).- Plume boundary dashed where inferred.- 2016 TCE results are ug/L or ppb.- U or ND - Non-detected result.- J - Estimated Result.- MCL = Maximum Contaminant Level

0 300150Feet

Service Layer Credits: - Aerial Source: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX,Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User Community.- Road Centerline Source: Esri, TomTom.

LEGEND!(

- TCE above MCL of 5 ug/L

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- Dry well or insufficient water for purging/sampling(<3 feet of water in welldesignated for low-flow purging)

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FIGURE 31,1,1-Trichloroethane and Trichloroethene Soil Gas Results -

November 2017

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TCE: 570

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TCE: 680

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K31,1,1-TCA: 56U

TCE: 170

K4

K51,1,1-TCA: 54U

TCE: 130

K6K7 K8

1,1,1-TCA: 55UTCE: 71K9

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J41,1,1-TCA: 17U

TCE: 6.2J J5 J6J7

J81,1,1-TCA: 23U

TCE: 140

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I81,1,1-TCA: 23U

TCE: 6.8JI7

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TCE: 48I5

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C:\_projects\SantaSusana\GIS\MXD\Groundwater\GWIM\SSFL_GWIM_FSDF_Pond_111TCA_TCE_Results_20180123.mxd 1/23/2018


- 1,1,1-TCA = 1,1,1-Trichloroethane.- TCE = Trichloroethene.- All results ug/m3.- J = Estimated result.- U = Non-detected result.

0 6030Feet

Service Layer Credits: - Aerial Source: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX,Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User Community.- Road Centerline Source: Esri, TomTom.

LEGENDFSDF MIP/Well LocationExisting WellFormer Concrete Pool

Road CenterlineFormer FSDF PondExisting Structure

Existing SubstationDemolished StructureSSFL Property BoundaryArea IV Boundary

Table 1 - FSDF Area Passive Soil Gas Sampler Deployment Data

Location Date TimeSample Depth Date Time

Duration (hours) Sample Number

D4 11/8/2017 930 8.3 11/13/2017 840 119.2 D4-SV-111317E4 11/8/2017 1415 9.93 11/13/2017 843 114.45 E4-SV-111317C5 11/8/2017 1440 5.64 11/13/2017 830 114.3 C5-SV-111317E6 11/8/2017 1500 9.3 11/13/2017 835 113.5 E6-SV-111317G4 11/8/2017 1528 8.35 11/10/2017 1450 47.4 G4-SV-111017K5 11/9/2017 734 7.7 11/10/2017 1437 55.1 K5-SV-111017I6 11/9/2017 757 7.2 11/13/2017 846 96.8 I6-SV-111317K8 11/9/2017 822 10.75 11/10/2017 1428 29.8 K8-SV-111017K3 11/9/2017 844 8.83 11/10/2017 1445 29.9 K3-SV-111017J4 11/9/2017 905 6.33 11/13/2017 855 95.8 J4-SV-111317J8 11/14/2017 730 8.75 11/17/2017 747 72.2 J8-SV-111717I8 11/14/2017 810 4.7 11/17/2017 750 71.7 I8-SV-111717L5 11/14/2017 725 8.2 11/17/2017 825 72.7 L5-SV-111717I4 11/14/2017 841 8.5 11/17/2017 809 71.3 I4-SV-111717H3 11/14/2017 909 8.5 11/17/2017 806 71 H3-SV-111717H5 11/14/2017 940 10 11/17/2017 812 70.6 H5-SV-111717D3 11/14/2017 1508 6.06 11/17/2017 821 65.3 D3-SV-111717F3 11/14/2017 1540 8 11/17/2017 804 64.4 F3-SV-111717F7 11/14/2017 1600 5.7 11/17/2017 822 64.4 F7-SV-111717G7 11/14/2017 1615 6 11/17/2017 814 63.9 G7-SV-111717

Deployment Retrieval

Table 2 - FSDF Passive Soil Gas Sampling ResultsC5 D3 D4 E4 E6

C5-SV-111317 D3-SV-111717 D4-SV-111317 E4-SV-111317 E6-SV-11131711/13/2017 11/17/2017 11/13/2017 11/13/2017 11/13/2017

Chemical Unit1,1,1-Trichloroethane ug/m3 520 24 J 1500 410 170001,1,2,2-Tetrachloroethane ug/m3 4.9 U 8.5 U 4.7 U 4.8 U 4.9 U1,1,2-Trichloroethane ug/m3 8.4 U 15 U 8.1 U 8.4 U 8.4 U1,1-Dichloroethane ug/m3 13 J 24 U 13 U 14 U 270Tetrachloroethene ug/m3 1.7 J 9.8 U 7.5 5.9 18Trichloroethene ug/m3 620 23 680 670 39001,1-Dichloroethene ug/m3 140 110 U 57 J 48 J 50001,2,4-Trimethylbenzene ug/m3 3.2 U 5.6 U 3 U 3.2 U 3.2 U1,2-Dichlorobenzene ug/m3 2.7 U 4.7 U 2.6 U 2.7 U 2.7 U1,2-Dichloroethane ug/m3 9.8 U 17 U 9.4 U 9.7 U 9.8 U1,3,5-Trimethylbenzene ug/m3 3.5 U 6.1 U 3.3 U 3.5 U 3.5 U1,3-Dichlorobenzene ug/m3 3 U 5.3 U 2.9 U 3 U 3 U1,4-Dichlorobenzene ug/m3 2.9 U 5.1 UJ 2.8 U 2.9 U 2.9 U2-Butanone (MEK) ug/m3 9 J 26 U 14 U 12 J 11 J4-Methyl-2-pentanone (MIBK) ug/m3 17 U 30 U 17 U 17 U 17 UAcetone ug/m3 68 U 120 U 65 U 68 U 68 UBenzene ug/m3 34 J 70 U 29 J 30 J 37 JCarbon Tetrachloride ug/m3 12 U 22 U 12 U 12 U 7.1 JChlorobenzene ug/m3 6.1 U 11 U 5.8 U 6.1 U 6.1 UChloroform ug/m3 11 U 20 U 11 U 11 U 25Chloromethane ug/m3 73 U 130 U 70 U 73 U 73 Ucis-1,2-Dichloroethene ug/m3 11 U 20 U 11 U 11 U 42Cyclohexane ug/m3 7.2 J 19 U 22 7.3 J 220Ethylbenzene ug/m3 4.6 J 9.1 U 3.1 J 2.7 J 2.6 JHexane ug/m3 58 U 100 U 56 U 58 U 59 UMethyl tert butyl ether ug/m3 14 U 24 U 13 U 14 U 14 Um-Xylene & p-Xylene ug/m3 5.6 9.1 U 5 J 4.1 J 5.2 UNaphthalene ug/m3 4.9 U 8.5 U 4.7 U 4.8 U 4.9 UN-Heptane ug/m3 10 U 18 U 10 U 6.6 J 10 Un-Propylbenzene ug/m3 3.8 U 6.7 U 3.7 U 3.8 U 3.9 Uo-Xylene ug/m3 2.4 J 8.5 U 4.7 U 4.8 U 4.9 UStyrene ug/m3 4.9 U 8.5 U 4.7 U 4.8 U 4.9 UToluene ug/m3 21 5.9 J 15 16 17trans-1,2-Dichloroethene ug/m3 27 U 47 U 26 U 27 U 27 UVinyl Chloride ug/m3 71 U 120 UJ 68 U 71 U 72 U

LocationSample NameSample Date

Table 2 - FSDF Passive Soil Gas Sampling

Chemical Unit1,1,1-Trichloroethane ug/m31,1,2,2-Tetrachloroethane ug/m31,1,2-Trichloroethane ug/m31,1-Dichloroethane ug/m3Tetrachloroethene ug/m3Trichloroethene ug/m31,1-Dichloroethene ug/m31,2,4-Trimethylbenzene ug/m31,2-Dichlorobenzene ug/m31,2-Dichloroethane ug/m31,3,5-Trimethylbenzene ug/m31,3-Dichlorobenzene ug/m31,4-Dichlorobenzene ug/m32-Butanone (MEK) ug/m34-Methyl-2-pentanone (MIBK) ug/m3Acetone ug/m3Benzene ug/m3Carbon Tetrachloride ug/m3Chlorobenzene ug/m3Chloroform ug/m3Chloromethane ug/m3cis-1,2-Dichloroethene ug/m3Cyclohexane ug/m3Ethylbenzene ug/m3Hexane ug/m3Methyl tert butyl ether ug/m3m-Xylene & p-Xylene ug/m3Naphthalene ug/m3N-Heptane ug/m3n-Propylbenzene ug/m3o-Xylene ug/m3Styrene ug/m3Toluene ug/m3trans-1,2-Dichloroethene ug/m3Vinyl Chloride ug/m3


F3 F7 G4 G7 H3F3-SV-111717 F7-SV-111717 G4-SV-111017 G7-SV-111717 H3-SV-11171711/17/2017 11/17/2017 11/10/2017 11/17/2017 11/17/2017

30 26 U 35 U 26 U 23 U8.6 U 8.6 U 12 U 8.7 U 7.8 U15 U 15 U 20 U 15 U 14 U25 U 25 U 34 U 25 U 22 U10 U 10 U 14 U 10 U 8 J15 U 15 U 66 240 280110 U 110 U 150 U 110 U 100 U5.6 U 5.6 U 7.6 U 5.7 U 5.1 U4.8 U 4.8 U 6.5 U 4.8 U 4.4 U17 U 17 U 23 U 17 U 16 U6.2 U 6.2 U 8.4 U 6.2 U 5.6 U5.4 U 5.4 U 7.3 U 5.4 U 4.9 U5.2 UJ 5.2 UJ 7 U 5.2 UJ 4.7 UJ16 J 26 U 36 U 26 U 24 U31 U 31 U 42 U 31 U 28 U120 U 120 U 160 U 120 U 55 J71 U 71 U 49 J 71 U 64 U22 U 22 U 30 U 22 U 20 U11 U 11 U 15 U 11 U 9.8 U20 U 20 U 27 U 20 U 18 U130 U 130 U 180 U 130 U 120 U20 U 20 U 27 U 20 U 18 U20 U 20 U 27 U 20 U 18 U8.4 J 9.2 U 12 U 9.3 U 8.4 U27 J 15 J 140 U 100 U 94 U24 U 24 U 33 U 24 U 22 U8.7 J 9.2 U 12 U 9.3 U 8.4 U8.6 U 8.6 U 12 U 8.7 U 7.8 U16 J 18 U 25 U 19 U 17 U6.8 U 6.8 U 9.2 U 6.8 U 6.2 U8.6 U 8.6 U 12 U 8.7 U 7.8 U8.6 U 8.6 U 12 U 8.7 U 7.8 U32 12 J 9.6 J 7.5 J 12

48 U 48 U 65 U 48 U 44 U130 UJ 130 UJ 170 U 130 UJ 110 UJ




H5 I4 I6 I8 J4H5-SV-111717 I4-SV-111717 I6-SV-111317 I8-SV-111717 J4-SV-11131711/17/2017 11/17/2017 11/13/2017 11/17/2017 11/13/2017

43 23 U 17 U 23 U 17 U7.9 U 7.8 U 5.7 U 7.8 U 5.8 U14 U 13 U 9.9 U 13 U 10 U23 U 22 U 16 U 22 U 17 U2.2 J 9 U 3.7 J 8.9 U 6.7 U32 13 U 48 6.8 J 6.2 J

100 U 100 U 75 U 100 U 76 U12 5.1 U 3.7 U 4 J 3.8 U

4.4 U 4.3 U 3.2 U 4.3 U 3.2 U16 U 16 U 11 U 16 U 12 U14 5.6 U 4.1 U 5.5 U 4.1 U

4.9 U 4.8 U 3.6 U 4.8 U 3.6 U4.7 UJ 4.7 UJ 3.4 U 4.6 UJ 3.5 U24 U 24 U 18 U 24 U 18 U28 U 28 U 20 U 28 U 21 U110 110 U 80 U 110 U 81 U65 U 64 U 25 J 64 U 24 J20 U 20 U 14 U 20 U 15 U9.9 U 9.7 U 7.2 U 9.7 U 7.2 U18 U 18 U 13 U 18 U 13 U120 U 120 U 86 U 120 U 87 U18 U 18 U 13 U 18 U 14 U18 U 18 U 13 U 18 U 13 U3.9 J 6.2 J 6.1 U 3.6 J 2.9 J15 J 22 J 69 U 93 U 70 U22 U 22 U 16 U 22 U 16 U6.5 J 7.8 J 6.1 U 10 4.8 J7.9 U 7.8 U 5.7 U 7.8 U 5.8 U17 U 12 J 12 U 17 U 12 U6.2 U 6.1 U 4.5 U 6.1 U 4.6 U7.9 U 7.8 U 5.7 U 3.4 J 5.8 U7.9 U 7.8 U 5.7 U 7.8 U 5.8 U20 26 5.8 J 16 9.2

44 U 43 U 32 U 43 U 32 U120 UJ 110 UJ 84 U 110 UJ 85 U




J8 K3 K5 K5 - Field Duplicat K8J8-SV-111717 K3-SV-111017 K5-SV-111017 K305-SV-111017 K8-SV-11101711/17/2017 11/10/2017 11/10/2017 11/10/2017 11/10/2017

23 U 56 U 54 U 54 U 55 U7.7 U 18 U 18 U 18 U 18 U13 U 32 U 31 U 31 U 32 U22 U 53 U 52 U 52 U 53 U7.8 J 21 U 13 J 13 J 21 U140 170 130 150 71

100 U 240 U 230 U 230 U 240 U5 U 12 U 12 U 12 U 12 U

4.3 U 10 U 9.9 U 9.9 U 10 U15 U 37 U 36 U 36 U 37 U5.5 U 13 U 13 U 13 U 13 U4.8 U 12 U 11 U 11 U 12 U4.6 UJ 11 U 11 U 11 U 11 U24 U 34 J 36 J 34 J 56 U28 U 66 U 64 U 64 U 66 U110 U 260 U 250 U 250 U 260 U63 U 86 J 79 J 78 J 76 J20 U 47 U 45 U 45 U 47 U9.6 U 23 U 22 U 22 U 23 U18 U 43 U 41 U 41 U 42 U120 U 280 U 270 U 270 U 280 U18 U 43 U 42 U 42 U 43 U18 U 42 U 41 U 41 U 42 U8.3 U 20 U 19 U 19 U 20 U93 U 220 U 210 U 210 U 220 U22 U 52 U 50 U 51 U 52 U8.3 U 20 U 19 U 19 U 20 U7.7 U 18 U 18 U 18 U 18 U16 U 40 U 38 U 38 U 40 U6.1 U 15 U 14 U 14 U 14 U7.7 U 18 U 18 U 18 U 18 U7.7 U 18 U 18 U 18 U 18 U8.3 J 23 J 28 33 3043 U 100 U 99 U 99 U 100 U

110 UJ 270 U 260 U 260 U 270 U




L5 FIELD BLANK FIELD BLANKL5-SV-111717 FB-SV-111317 FB-SV-11171711/17/2017 11/13/2017 11/17/2017

23 U 16 U 23 U7.6 U 5.4 U 7.7 U13 U 9.3 U 13 U22 U 16 U 22 U24 6.2 U 8.9 U

570 9.2 U 13 U99 U 70 U 100 U5 U 3.5 U 5 U

4.2 U 3 U 4.3 U15 U 11 U 15 U5.4 U 3.8 U 5.5 U4.8 U 3.4 U 4.8 U4.6 UJ 3.2 U 4.6 UJ16 J 16 U 24 U27 U 19 U 27 U110 U 37 J 110 U62 U 44 U 63 U19 U 14 U 20 U9.5 U 6.7 U 9.6 U32 12 U 18 U

110 U 81 U 120 U18 U 13 U 18 U17 U 12 U 17 U7.7 J 5.8 U 8.2 U15 J 65 U 92 U22 U 15 U 22 U7.8 J 5.8 U 8.2 U7.6 U 5.4 U 7.7 U16 U 12 U 16 U6 U 4.2 U 6.1 U

7.6 U 5.4 U 7.7 U7.6 U 5.4 U 7.7 U26 8.1 U 12 U

42 U 30 U 43 U110 UJ 79 U 110 UJ

Table 3 - Summary of MIP Readings and Passive Soil Gas Sampling Results for FSDF Source Investigation

LocationProbe Depth

MIP Intake Depth XSD Min XSD Max ECD Min ECD Max PID Min PID Max 1,1,1-TCA 1,1-DCA TCE 1,1-DCE PCE Benzene Toluene

RD-21 6.25 5.05 3.85E+04 5.12E+04 4.31E+05 1.52E+06 4.67E+04 3.72E+05RS-54 8.15 6.95 4.05E+04 4.36E+04 4.45E+05 1.54E+06 5.07E+04 1.22E+05AA4 2.55 1.35 4.86E+04 4.91E+04 5.01E+05 5.03E+05 3.82E+04 3.88E+04A4 4.4 3.2 6.61E+04 7.47E+04 3.66E+05 1.50E+06 4.54E+04 2.64E+04

. A5 7 5.8 3.49E+04 3.69E+04 3.09E+05 1.30E+06 3.66E+04 6.79E+04A6 3.5 2.3 6.03E+04 6.54E+04 3.51E+05 1.52E+06 4.57E+04 7.82E+04A7 3.65 2.45 5.98E+04 6.71E+04 3.48E+05 1.48E+06 4.68E+04 1.80E+05A8 1.6 0.4 5.41E+04 5.49E+04 3.26E+05 3.26E+05 4.66E+04 4.68E+04B4 6 4.8 5.92E+04 9.33E+04 3.70E+05 1.49E+06 4.53E+04 1.67E+05B5 4.7 3.5 4.45E+04 4.62E+04 4.64E+05 1.45E+06 3.98E+04 6.79E+04B6 8.2 7 4.50E+04 1.37E+05 5.25E+05 1.64E+06 5.33E+04 3.95E+05B7 2.6 1.4 5.33E+04 5.72E+04 5.23E+05 1.58E+06 5.53E+04 7.26E+04B8 2.3 1.1 3.30E+04 4.75E+04 3.34E+05 1.44E+06 4.72E+04 1.12E+05C4 7.15 5.95 5.01E+04 5.66E+04 3.43E+05 1.58E+06 4.73E+04 1.38E+05C5 4.75 3.55 3.94E+04 4.60E+04 4.88E+05 1.56E+06 4.88E+04 1.27E+05 520 13 620 140 1.7 34 21C6 4.05 2.85 3.90E+04 4.04E+04 4.48E+05 1.55E+06 4.81E+04 1.24E+05C7 3.5 2.3 5.28E+04 6.48E+04 4.93E+05 1.60E+06 5.58E+04 8.17E+04C8 2.4 1.2 3.17E+04 5.03E+04 3.34E+05 1.29E+06 4.71E+04 3.98E+05D3 7.65 6.45 3.62E+04 4.75E+04 5.79E+05 1.53E+06 4.27E+04 4.04E+05 ND ND 23 ND ND 37 5.9D4 10.15 8.95 5.18E+04 9.01E+04 3.82E+05 1.66E+06 5.12E+04 1.02E+06 1500 ND 680 57 7.5 29 15D5 9 7.8 2.53E+04 3.43E+04 3.41E+05 1.37E+06 3.91E+04 1.76E+05D6 6.85 5.65 3.99E+04 4.85E+04 4.60E+05 1.54E+06 4.97E+04 1.11E+05D7 5.45 4.25 5.17E+04 6.84E+04 4.74E+05 1.59E+06 5.72E+04 2.63E+05D8 4.25 3.05 3.40E+04 4.81E+04 3.23E+05 1.51E+06 4.37E+04 5.71E+05E3 8.15 6.95 4.02E+04 5.23E+04 4.77E+05 1.53E+06 4.39E+04 4.18E+05E4 11.35 10.15 5.27E+04 7.29E+04 3.87E+05 1.65E+06 5.15E+04 1.23E+06 410 ND 670 48 5.9 44 16E5 8.25 7.05 3.88E+04 6.83E+04 4.62E+05 1.56E+06 4.94E+04 5.07E+05E6 8.85 7.65 3.26E+04 7.55E+04 6.84E+05 1.58E+06 4.30E+04 2.18E+05 17000 270 3900 5000 18 37 17E7 5.35 4.15 3.59E+04 6.25E+04 3.14E+05 1.72E+06 4.68E+04 3.83E+05E8 4.35 3.15 3.01E+04 5.58E+04 3.12E+05 1.50E+06 4.21E+04 1.89E+06


LocationProbe Depth


F1 5.95 4.75 5.32E+04 6.32E+04 3.93E+05 1.51E+06 4.38E+04 1.47E+05F2 8.95 7.75 4.94E+04 7.76E+04 4.54E+05 1.60E+06 5.87E+04 1.01E+06F3 8.6 7.4 4.10E+04 5.68E+04 4.37E+05 1.53E+06 4.59E+04 5.52E+05 30 ND ND ND ND 58 32F4 11.15 9.95 5.21E+04 7.21E+04 3.48E+05 1.70E+06 4.72E+04 6.94E+05F5 4.55 3.35 2.57E+04 2.89E+04 3.48E+05 1.37E+06 4.01E+04 6.50E+04F6 7.6 6.4 3.62E+04 4.30E+04 5.01E+05 1.47E+06 4.33E+04 2.24E+05F7 5.05 3.85 3.43E+04 5.01E+04 3.55E+05 1.46E+06 4.91E+04 6.16E+05 ND ND ND ND ND 40 12F8 4.1 2.9 2.83E+04 4.19E+04 2.91E+05 1.50E+06 4.06E+04 4.61E+05G0 6.2 5 7.52E+04 8.45E+04 3.38E+05 1.47E+06 4.41E+04 3.17E+05G1 9.15 7.95 5.21E+04 7.30E+04 4.57E+05 1.52E+06 4.32E+04 4.53E+05G2 8.5 7.3 6.20E+04 7.53E+04 4.78E+05 1.62E+06 5.71E+04 2.23E+05G3 12 10.8 4.27E+04 5.44E+04 4.16E+05 1.56E+06 4.75E+04 2.61E+05 ND ND 66 ND ND 49 9.6G4 8.95 7.75 5.68E+04 7.63E+04 4.09E+05 1.66E+06 4.97E+04 1.40E+06G5 8.6 7.4 3.55E+04 4.08E+04 3.38E+05 1.37E+06 4.04E+04 1.07E+05G6 8 6.8 3.65E+04 4.30E+04 4.13E+05 1.51E+06 4.53E+04 1.38E+05G7 6.5 5.3 4.02E+04 4.48E+04 3.50E+05 1.49E+06 4.94E+04 3.94E+05 ND ND 240 ND ND 36 7.5G8 5.3 4.1 2.88E+04 5.36E+04 2.85E+05 1.52E+06 3.96E+04 9.27E+05H0 9.8 8.6 6.97E+04 8.51E+04 3.31E+05 1.46E+06 4.33E+04 6.63E+05H1 10.8 9.6 4.50E+04 7.06E+04 6.59E+05 1.56E+06 4.32E+04 7.49E+05H2 10.85 9.65 5.24E+04 7.20E+04 4.38E+05 1.62E+06 5.56E+04 8.57E+05H3 8.85 7.65 3.96E+04 5.29E+04 3.85E+05 1.53E+06 4.99E+04 1.30E+05 ND ND 280 ND 8 34 12H4 9.84 8.64 4.10E+04 4.38E+04 4.14E+05 1.35E+06 3.70E+04 1.41E+05H5 9.75 8.55 2.75E+04 4.21E+04 3.23E+05 1.42E+06 4.01E+04 3.08E+05 43 ND 32 ND 2.2 39 20H6 8.2 7 3.69E+04 4.47E+04 3.89E+05 1.48E+06 4.49E+04 3.08E+05H7 6.85 5.65 3.08E+04 4.27E+04 3.52E+05 1.49E+06 4.71E+04 1.17E+05H8 4.15 2.95 2.70E+04 3.86E+04 2.87E+05 1.51E+06 3.93E+04 3.68E+05H9 3.15 1.95 5.20E+04 5.60E+04 3.25E+05 1.48E+06 4.81E+04 2.92E+05I0 8.95 7.75 7.28E+04 8.42E+04 3.71E+05 1.52E+06 4.48E+04 7.94E+05I1 8 6.8 7.07E+04 9.00E+04 3.93E+05 1.61E+06 4.94E+04 6.60E+05I2 10.25 9.05 5.12E+04 6.72E+04 4.27E+05 1.61E+06 5.48E+04 2.33E+05


LocationProbe Depth


I3 11.75 10.55 3.96E+04 5.29E+04 3.85E+05 1.53E+06 4.99E+04 1.30E+05I4 9.1 7.9 5.78E+04 6.68E+04 3.79E+05 1.53E+06 5.02E+04 8.76E+05 ND ND ND ND ND 47 26I5 9.2 8 2.82E+04 3.12E+04 3.29E+05 1.35E+06 4.04E+04 1.50E+05I6 7.8 6.6 3.22E+04 1.27E+05 4.07E+05 1.56E+06 4.96E+04 9.72E+04 ND ND 48 ND 3.7 25 5.8I7 6.95 5.75 2.91E+04 5.90E+04 3.46E+05 1.47E+06 4.34E+04 8.40E+04I8 5.8 4.6 3.74E+04 5.39E+04 2.74E+05 1.48E+06 3.69E+04 5.55E+05 ND ND 6.8 ND ND 33 16I9 5.8 4.6 5.43E+04 6.50E+04 3.28E+05 1.43E+06 4.68E+04 4.31E+00J0 7.7 6.5 6.52E+04 9.87E+04 3.47E+05 1.49E+06 4.13E+04 7.74E+05J1 8.75 7.55 6.73E+04 7.75E+04 3.75E+05 1.59E+06 5.14E+04 6.75E+05J2 9.7 8.5 3.91E+04 5.91E+04 4.07E+05 1.59E+06 5.41E+04 9.89E+05J3 10.4 9.2 3.81E+04 5.37E+04 3.44E+05 1.58E+06 4.96E+04 8.34E+05J4 6.7 5.5 2.60E+04 3.27E+04 3.64E+05 1.45E+06 4.53E+04 2.90E+05 ND ND 6.2 ND ND 24 9.2J5 4.8 3.6 2.45E+04 2.77E+04 4.36E+05 1.39E+06 3.90E+04 7.07E+04J6 8.15 6.95 6.54E+04 7.33E+04 3.98E+05 1.55E+06 4.84E+04 2.14E+05J7 7.55 6.35 2.70E+04 4.77E+04 3.39E+05 1.45E+06 4.10E+04 1.76E+05J8 9.55 8.35 3.91E+04 5.87E+04 3.05E+05 1.59E+06 3.70E+04 8.61E+05 ND ND 140 ND 7.8 ND 8.3J9 6.9 5.7 6.13E+04 7.47E+04 3.46E+05 1.51E+06 4.65E+04 9.40E+05K0 10.65 9.45 5.91E+04 8.96E+04 4.07E+05 1.60E+06 5.45E+04 7.27E+05K1' 10.75 9.55 6.36E+04 7.42E+04 3.72E+05 1.44E+06 4.07E+04 8.46E+05K1 10.4 9.2 5.83E+04 7.88E+04 4.32E+05 1.54E+06 5.15E+04 6.06E+05K2 10.05 8.85 4.05E+04 6.16E+04 3.98E+05 1.65E+06 4.36E+04 8.30E+05K3 8.9 7.7 4.24E+04 4.70E+04 4.85E+05 1.54E+06 4.53E+04 6.46E+05 ND ND 170 ND ND 86 23K4 9.3 8.1 4.03E+04 5.16E+04 4.74E+05 1.62E+06 4.49E+04 9.54E+05K5 9.05 7.85 4.65E+04 6.84E+04 4.55E+05 1.55E+06 4.33E+04 9.39E+05 ND ND 130 ND 13 79 28K6 8.75 7.55 5.17E+04 5.81E+04 4.78E+05 1.53E+06 4.35E+04 2.77E+05K7 6.8 5.6 3.54E+04 4.78E+04 4.88E+05 1.50E+06 4.33E+04 7.21E+05K8 12 10.8 3.43E+04 4.01E+04 5.49E+05 1.46E+06 4.36E+04 5.20E+05 ND ND 71 ND ND 76 30K9 11.4 10.2 4.71E+04 5.95E+04 4.08E+05 1.38E+06 3.87E+04 1.22E+06L0 8.65 7.45 6.31E+04 7.16E+04 3.44E+05 1.44E+06 4.05E+04 5.63E+05L1 11.2 10 6.79E+04 9.13E+04 4.14E+05 1.61E+06 5.46E+04 7.17E+05


LocationProbe Depth


L2 11.05 9.85 6.45E+04 1.08E+05 3.97E+05 1.56E+06 5.17E+04 8.71E+05L3 10 8.8 5.85E+04 8.54E+04 4.12E+05 1.56E+06 5.33E+04 8.13E+05L4 7.1 5.9 2.66E+04 3.01E+04 3.83E+05 1.41E+06 4.56E+04 9.56E+04L5 7.95 6.75 2.52E+04 3.25E+04 3.89E+05 1.44E+06 4.33E+04 3.52E+05 ND ND 570 ND 24 42 26L6 8.65 7.45 6.66E+04 7.26E+04 4.07E+05 1.55E+06 4.99E+04 1.41E+05L7 9 7.8 2.36E+04 2.69E+04 3.71E+05 1.38E+06 3.71E+04 8.45E+04L8 9.2 8 3.91E+04 4.91E+04 4.20E+05 1.50E+06 7.70E+04 7.70E+04L9 8.25 7.05 5.62E+04 8.78E+04 3.33E+05 1.52E+06 4.66E+04 1.15E+05M1 7.35 6.15 5.10E+04 7.95E+04 3.83E+05 1.60E+06 5.20E+04 3.35E+05M2 8.25 7.05 4.92E+04 7.45E+04 4.08E+05 1.50E+06 4.08E+04 2.00E+06M3 7 5.8 5.55E+04 6.27E+04 5.03E+05 1.53E+06 4.68E+04 1.90E+05M4 9.35 8.15 3.47E+04 4.59E+04 3.26E+05 1.56E+06 4.51E+04 5.32E+05M5 9.1 7.9 3.34E+04 4.56E+04 3.18E+05 1.47E+06 4.46E+04 3.26E+05M6 8.8 7.6 3.35E+04 4.24E+04 3.37E+05 1.59E+06 4.66E+04 2.08E+05M7 8.2 7 3.43E+04 4.35E+04 3.80E+05 1.61E+06 5.10E+04 4.55E+05M8 9.65 8.45 3.70E+04 4.84E+04 4.28E+05 1.57E+06 4.95E+04 3.71E+05M9 14.5 13.3 2.98E+04 4.19E+04 4.45E+05 1.50E+06 4.22E+04 3.57E+05M10 12.85 11.65 5.58E+04 7.48E+04 4.16E+05 1.38E+06 4.17E+04 1.38E+06

XSD - halogen specific detector 1,1,1-TCA - 1,1,1-trichloroethaneECD - electron capture detector 1,1-DCA - 1-1-dichloroethaneFID - flame ionization detector TCE - trichloroethene

1,1-DCE - 1,1-dichloroethenePCE - tetrachloroethene

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