Attachment 6p - CPC Staff Report - May 21, 2026 — Riverside City Council, July 14, 2026

GSI Job No.: 6239

Former Riverside Scrap Iron & Metal Property Soil Vapor Investigation Report

APPENDIX B
Boring Logs

ML
ML
ML
0 0
0 Temporary soil vapor probes
installed at 5', 15' and 30' bgs.

Probes constructed using 1/4"
nylaflow tubing connected to a
1" porous poly probe tip
centered in a 1' thick layer of
#3 sand pack, followed by 6"
layer of dry bentonite,
then hydrated bentonite to the
bottom of the next sand
interval or ground surface.

Probe Depth Color Codes
Red - 30'
Blue - 15'
Yellow - 5'
Gravel
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine sand, medium stiff
~10% fine to coarse sand

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 7822DT

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 3 Nov 2022 COMPLETED 3 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
(Continued Next Page)
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 2 Date Issued: 12/8/2022VP-1
Log of Soil Boring: VP-1
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:11 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML 0
0 0
Continued
Total Depth = 30.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
25 30
PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 2 OF 2 Date Issued: 12/8/2022VP-1
Log of Soil Boring: VP-1
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:11 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
0 0
0 Temporary soil vapor probes
installed at 5' and 15' bgs.

Probe Depth Color Codes
Blue - 15'
Yellow - 5'
Gravel
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to coarse sand
Slight increase in fine sand
Total Depth = 15.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 7822DT

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 3 Nov 2022 COMPLETED 3 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 1 Date Issued: 12/8/2022VP-2
Log of Soil Boring: VP-2
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:11 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
ML
SW-SM
0 0
0 Temporary soil vapor probes
installed at 5' and 15' bgs.

Probe Depth Color Codes
Blue - 15'
Yellow - 5'
Gravel
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~90% fines, ~10% fine to coarse sand
~95% fines, ~5% sand
WELL GRADED SAND WITH SILT (SW-SM): dark yellowish
brown (10YR 4/6), ~90% fine to coarse sand, ~10% fines
Total Depth = 15.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 7822DT

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 3 Nov 2022 COMPLETED 3 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 1 Date Issued: 12/8/2022VP-3
Log of Soil Boring: VP-3
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:11 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
ML
ML

0.1 0
0 Temporary soil vapor probes
installed at 5' and 15' bgs.

Probe Depth Color Codes
Blue - 15'
Yellow - 5'
Gravel and Silt mix
SILT (ML): dark brown (10YR 3/3), moist, ~95% fines, ~5% fine to coarse sand
Dark yellowish brown (10YR 4/6), moist
SILT WITH SAND dark yellowish brown (10YR 4/6), moist,
~85% fines, ~15% fine to coarse sand
Total Depth = 15.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 7822DT

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 4 Nov 2022 COMPLETED 4 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 1 Date Issued: 12/8/2022VP-4
Log of Soil Boring: VP-4
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
ML
ML

0.1 0
0 Temporary soil vapor probes
installed at 5' and 15' bgs.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 7822DT

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 4 Nov 2022 COMPLETED 4 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 1 Date Issued: 12/8/2022VP-5
Log of Soil Boring: VP-5
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
0 0
0 Temporary soil vapor probes
installed at 5' and 13' bgs.

Probe Depth Color Codes
Blue - 13'
Yellow - 5'
collapsed at depth, attempted
to drill to 15.5'. Refusal at

13.5'
Gravel and silt mix
Crushed concrete
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to coarse sand
Total Depth = 15.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 7822DT

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 7 Nov 2022 COMPLETED 7 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel/Silt

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 1 Date Issued: 12/8/2022VP-6
Log of Soil Boring: VP-6
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
ML
ML
ML

0.1 0.1
0 Temporary soil vapor probes
installed at 5' and 15' bgs.

Probe Depth Color Codes
Blue - 15'
Yellow - 5'
Gravel and Silt mix
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to coarse sand
Increase in coarse sand and fine gravel
SILT WITH SAND dark yellowish brown (10YR 4/6), moist,
~85% fines, ~15% fine to coarse sand
Total Depth = 15.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 7822DT

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 4 Nov 2022 COMPLETED 4 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 1 Date Issued: 12/8/2022VP-7
Log of Soil Boring: VP-7
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
0 0
0 Temporary soil vapor probes
installed at 5' and 15' bgs.

Probe Depth Color Codes
Blue - 15'
Yellow - 5'
Gravel and silt mix
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to coarse sand
Total Depth = 15.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 6600

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 7 Nov 2022 COMPLETED 7 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 1 Date Issued: 12/8/2022VP-8
Log of Soil Boring: VP-8
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
SM
ML
0 0
0 Temporary soil vapor probes
installed at 5', 15' and 30' bgs.

Probe Depth Color Codes
Red - 30'
Blue - 15'
Yellow - 5'
GRAVEL
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to coarse sand
SILTY SAND (SM): dark yellowish brown (10YR 4/6), moist, ~80% sand, ~20% fines
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to medium sand

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 7822DT

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 3 Nov 2022 COMPLETED 3 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
(Continued Next Page)
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 2 Date Issued: 12/8/2022VP-9
Log of Soil Boring: VP-9
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
SP-SM
ML
0 0
0 Continued
POORLY GRADED SAND (SP-SM): dark yellowish brown
(10YR 4/6), moist, ~95% fine sand, ~10% fines
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine sand
Total Depth = 30.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
25 30
PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 2 OF 2 Date Issued: 12/8/2022VP-9
Log of Soil Boring: VP-9
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
0 0
0 Temporary soil vapor probes
installed at 5' and 15' bgs.

Probe Depth Color Codes
Blue - 15'
Yellow - 5'
Gravel
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to coarse sand
Total Depth = 15.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 7822DT

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 3 Nov 2022 COMPLETED 3 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 1 Date Issued: 12/8/2022VP-10
Log of Soil Boring: VP-10
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
0 0
0 Temporary soil vapor probes
installed at 5' and 15' bgs.

Probe Depth Color Codes
Blue - 15'
Yellow - 5'
Gravel
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to coarse sand
Crushed gray rock
Total Depth = 15.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 7822DT

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 3 Nov 2022 COMPLETED 3 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 1 Date Issued: 12/8/2022VP-11
Log of Soil Boring: VP-11
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
ML
0 0
0 Temporary soil vapor probes
installed at 5', 15' and 30' bgs.

Probe Depth Color Codes
Red - 30'
Blue - 15'
Yellow - 5'
Mix of gravel and debris (plastic, glass, and other material fragments)
Mix of gravel and silt fill material
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to medium sand
SILT WITH SAND (ML): dark yellowish brown (10YR 4/6),
moist, ~85% fines, ~5% fine to medium sand

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 7822DT

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 4 Nov 2022 COMPLETED 4 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel/ Debris

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
(Continued Next Page)
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 2 Date Issued: 12/8/2022VP-12
Log of Soil Boring: VP-12
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
SW-SM
ML
0 0
0 Continue
WELL GRADED SAND WITH SILT (SW-SM): dark yellowish
brown (10YR 4/6), moist, ~90% fine to coarse sand, ~10% fines
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine sand
Total Depth = 30.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
25 30
PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 2 OF 2 Date Issued: 12/8/2022VP-12
Log of Soil Boring: VP-12
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
ML
ML
0 0
0 Temporary soil vapor probes
installed at 5' and 15' bgs.

Probe Depth Color Codes
Blue - 15'
Yellow - 5'
Gravel mixed with debris (plastic, glass, and wood fragments) SILT (ML): dark brown (10YR 3/3), moist, ~95% fines, ~5% fine to coarse sand
Dark yellowish brown (10YR 4/6), moist, ~5% fine to medium sand
SILT WITH SAND dark yellowish brown (10YR 4/6), moist,
~85% fines, ~15% fine to coarse sand
Total Depth = 15.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 7822DT

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 4 Nov 2022 COMPLETED 4 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel/ Debris

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 1 Date Issued: 12/8/2022VP-13
Log of Soil Boring: VP-13
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
SW-SC
ML
0 0
0 Temporary soil vapor probes
installed at 5', 15' and 22' bgs.

Probe Depth Color Codes
Red - 22'
Blue - 15'
Yellow - 5'
Gravel and mix of broken glass, wood and other debris
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to medium sand
WELL GRADED SAND WITH SILT (SW-SM): dark yellowish
brown (10YR 4/6), ~90% fine to coarse sand, ~10% fines
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to medium sand

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 7822DT

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 4 Nov 2022 COMPLETED 4 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
(Continued Next Page)
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 2 Date Issued: 12/8/2022VP-14
Log of Soil Boring: VP-14
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

0 Refusal at 22.5' after multiple
attempts
Total Depth = 22.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 2 OF 2 Date Issued: 12/8/2022VP-14
Log of Soil Boring: VP-14
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
0 0
Filled bottom of horehole with
hydrated bentonite to 5.5'.

Temporary soil vapor probes
installed at 5' bgs. Probes
constructed using 1/4"
nylaflow tubing connected to a
1" porous poly probe tip
centered in a 1' thick layer of
#3 sand pack.

Probe Depth Color Codes
Yellow - 5'
Refusal at ~1.5' at first
attempt. Step out 1' to south
refusal at 8' at step-out
location.

Gravel, silt, and debris mix (broken glass, concrete, metal, and plastic fragments)
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to coarse sand
Total Depth = 8.0 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 6600

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 7 Nov 2022 COMPLETED 7 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel/ Silt/ Debris

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 1 Date Issued: 12/8/2022VP-15
Log of Soil Boring: VP-15
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
0 0
0 Temporary soil vapor probes
installed at 5' and 15' bgs.

Probe Depth Color Codes
Blue - 15'
Yellow - 5'
Gravel, silt, and debris mix (glass, wood, metal, plastic fragments)
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to coarse sand
Total Depth = 15.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 6600

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 7 Nov 2022 COMPLETED 7 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel/Silt

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 1 Date Issued: 12/8/2022VP-16
Log of Soil Boring: VP-16
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
0 0
0 Temporary soil vapor probes
installed at 5' and 15' bgs.

Probe Depth Color Codes
Blue - 15'
Yellow - 5'
Asphalt
Gravel, silt, mix debris
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to medium sand
Total Depth = 15.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 7822DT

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 3 Nov 2022 COMPLETED 3 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEAsphalt 4"

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 1 Date Issued: 12/8/2022VP-17
Log of Soil Boring: VP-17
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
0 0
0 Temporary soil vapor probes
installed at 5' and 15' bgs.

Probe Depth Color Codes
Blue - 15'
Yellow - 5'
Concrete
SILT (ML): dark yellowish brown (10YR 4/6), ~95% fines, ~5% medium to fine sands
Trace root matter
Total Depth = 15.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 7822DT

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 3 Nov 2022 COMPLETED 3 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEConcrete 7"

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 1 Date Issued: 12/8/2022VP-18
Log of Soil Boring: VP-18
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
0 0
0 Temporary soil vapor probes
installed at 5', 15' and 30' bgs.

Probe Depth Color Codes
Red - 30'
Blue - 15'
Yellow - 5'

GRAVEL, SOME SILT
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to coarse sand

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 7822DT

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 3 Nov 2022 COMPLETED 3 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
(Continued Next Page)
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 2 Date Issued: 12/8/2022VP-19
Log of Soil Boring: VP-19
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
ML
0 0
0 ~10% fine to medium sand
SILT WITH SAND (ML): dark yellowish brown (10YR 4/6),
moist, ~75% fines, ~25% fine sand
Total Depth = 30.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
25 30
PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 2 OF 2 Date Issued: 12/8/2022VP-19
Log of Soil Boring: VP-19
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
SW-SM
0 0
0 Temporary soil vapor probes
installed at 5', 15' and 30' bgs.

Probe Depth Color Codes
Red - 30'
Blue - 15'
Yellow - 5'
Mix of gravel, silt, and concrete fragments
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to coarse sand
WELL GRADED SAND WITH SILT (SW-SM): dark yellowish
brown (10YR 4/6), moist, ~90% fine to coarse sand, ~10% fines

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 7822DT

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 4 Nov 2022 COMPLETED 4 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel/ Debris

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
(Continued Next Page)
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 2 Date Issued: 12/8/2022VP-20
Log of Soil Boring: VP-20
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
ML
0 0
0 Continued
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% medium to fine sand
Total Depth = 30.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
25 30
PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 2 OF 2 Date Issued: 12/8/2022VP-20
Log of Soil Boring: VP-20
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
ML
0 0
0 Temporary soil vapor probes
installed at 5' and 15' bgs.

Probe Depth Color Codes
Blue - 15'
Yellow - 5'
Gravel and Silt mix
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to medium sand
SILT WITH SAND (ML): dark yellowish brown (10YR 4/6),
moist, ~85% fines, ~15% fine to coarse sand
Total Depth = 15.5 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 6600

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 7 Nov 2022 COMPLETED 7 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel/Silt

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 10
15 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 1 Date Issued: 12/8/2022VP-21
Log of Soil Boring: VP-21
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

ML
ML
0 0
Refusal at 7', collapsed,
drilled down to 5.5' to install
SV probe at 5', hole collapsed
again. Performed step out
~1.5' north of location. Drilled
directly down, refusal at 6'.

Hole collapsed while
attempting to install SV probe.

No probe installation at this
location.

Probe Depth Color Codes
Gravel, silt and debris mix (broken glass, plastic, wood, and other debris fragments)
SILT (ML): dark yellowish brown (10YR 4/6), moist, ~95% fines, ~5% fine to coarse sand, trace gravel
No gravel
Total Depth = 7.0 feet.

Note: Where soil was not recovered, geologic interpretations are based on the lithology above and/or below the no sample interval, as well as observations made in the field.

LONGITUDE

DATUM NA

DATUM NA
DRILLING CONTRACTOR J & H Drilling Co., Inc. / MR Drilling DRILLING METHOD Direct Push, Hand Auger
DRILLING EQUIPMENT Geoprobe 6600

LATITUDE

TOP OF CASING ELEVATION NA
DATE STARTED 7 Nov 2022 COMPLETED 7 Nov 2022
LOGGED BY Konrad K Grochocki

APPROVED BY
REVIEWED BY Konrad K Grochocki
BORING DIAMETER (in)3.25/2.25GROUND SURFACEGravel/ Debris

GROUND ELEVATION NA

GROUND SURFACEGROUND SURFACE
Recovery
Water Level
Sample Type
USCS
Lab Sample
Depth
(ft bgs)
5 PID (ppm)
Notes
Blows/
6 inches
Lithology
Soil Description
PAGE 1 OF 1 Date Issued: 12/8/2022VP-22
Log of Soil Boring: VP-22
CLIENT Iron Lofts
GSI JOB NUMBER 6239
PROJECT NAME Iron Lofts
PROJECT LOCATION Riverside, CA
GSI_SOIL BORING - TRYTHISTEMPLATE.GDT - 12/8/22 22:12 - \\SOCAL-DC\JOBS\6201-6250\6239 IRON LOFTS FORMER RIVERSIDE SCRAP\GINT\6239.GPJ GSI Environmental
19200 Von Karman Ave. Suite 800
Irvine, CA 92612
Telephone: 949-679-1070

GSI Job No.: 6239

Former Riverside Scrap Iron & Metal Property Soil Vapor Investigation Report

APPENDIX C
Duplicate Soil Vapor Sample Evaluation

GSI Job No. 6239

Page 1 of 1 ends

APPENDIX C: DUPLICATE SAMPLE COMPARISON -- SOIL VAPOR
Primary Sample
ID Sample Date Units Compound Primary Sample
Result
Duplicate
Sample Result
Relative Percent
Difference1 (RPD)
VP-17-15 11/16/2022 µg/m3 Tetrachloroethene
(PCE) 180 180 0.0
VP-17-15 11/16/2022 µg/m3 Trichloroethene
(TCE) 290 300 3.4
VP-17-15 11/16/2022 µg/m3 Chloroform <4.9 <4.9 0.0
VP-17-15 11/16/2022 µg/m3 cis-1,2-Dichloroethene
(cis-1,2-DCE) <4 <4 0.0
VP-17-15 11/16/2022 µg/m3 trans-1,2-Dichloroethene
(trans-1,2-DCE) <8 <8 0.0
VP-17-15 11/16/2022 µg/m3 Vinyl Chloride
(VC) <2.6 <2.6 0.0
VP-17-15 11/16/2022 µg/m3 1,1-Dichloroethene
(1,1-DCE) <4 <4 0.0
VP-17-15 11/16/2022 µg/m3 1,1-Dichloroethane
(1,1-DCA) <4.1 <4.1 0.0
VP-17-15 11/16/2022 µg/m3 1,2-Dichloroethane
(1,2-DCA) <4.1 <4.1 0.0
VP-17-15 11/16/2022 µg/m3 Benzene <3.2 <3.2 0.0
VP-17-15 11/16/2022 µg/m3 Ethylbenzene <4.4 <4.4 0.0
VP-17-15 11/16/2022 µg/m3 Toluene 6.6 6.7 1.5
VP-17-15 11/16/2022 µg/m3 Xylene <8.8 <8.8 0.0
VP-17-15 11/16/2022 µg/m3 1,2,4-Trimethylbenzene <5 <5 0.0 VP-17-15 11/16/2022 µg/m3 Ethylbenzene <4.4 <4.4 0.0
VP-17-15 11/16/2022 µg/m3 1,1,1-Trichloroethane <5.5 <5.5 0.0 VP-17-15 11/16/2022 µg/m3
1,1,2-
Trichlorotrifluoroethane
(F113)
49 51 4.0
VP-17-15 11/16/2022 µg/m3 2-Butanone (MEK) 39 74 61.9
VP-17-15 11/16/2022 µg/m3 Carbon disulfide 11 12 8.7
VP-17-15 11/16/2022 µg/m3 Dichlorodifluoromethane
(F12) <5 <5 0.0
VP-17-15 11/16/2022 µg/m3 Methylene chloride
(Dichloromethane) <3.5 <3.5 0.0
VP-17-15 11/16/2022 µg/m3 Trichlorofluoromethane
(F11) 19 19 0.0
Notes:

Equation
= analyte concentration in primary sample
= analyte concentration in duplicate sample
= average of x1 and x2
Abbreviations:
bold values indicate analyte detected at concentration exceeding the method detection limit shaded values are qualified based duplicate evaluation. % = percent
µg/m3 = micrograms per cubic meter
< = analyte not detected above the method detection limit shown J = Analytical results were reported between the method detection limit and reporting limit the laboratory

1. The relative percent difference (RPD) was calculated for analytes detected in at least one sample using the equation below. Data is qualified with a "J" if the RPD exceeds 50%.

GSI Job No.: 6239

Former Riverside Scrap Iron & Metal Property Soil Vapor Investigation Report

APPENDIX D
Soil Vapor Purge Volumes

GSI Job No.: 6239

Former Riverside Scrap Iron & Metal Property Soil Vapor Investigation Report

APPENDIX E
Historical Soil Vapor Data

APPROXIMATE SCALE IN FEET
0 100 200
LEGEND
Soil Gas Sampling Locations (Amec 2015)
N
Maximum PCE Concentrations Shown in ug/L.

Concentrations >0.24 ug/L Shown inRED.

ES2

2.0 (5')
FIGURE 9A

DISTRIBUTION OF PCE IN SOIL GAS

RIVERSIDE SCRAP IRON & METAL
Riverside, California
Area 2
Area 13
Former Rail Tracks
Area 6
Western Farm Services
Area 8g
Area 7
Area 9
Existing
Buildings
Area 8h
S19
ND
S18
ND
Area 5
Area 4Area 14
S17

0.11 (15')
Area 8b
Area 12
S16

0.22 (12')
S13

0.21 (5')
S11

0.12 (15')
S10
NDS7

0.12 (15')
S8

0.39 (15')
Area 8c
S9

0.19 (15')
S15
ND
S12

0.10 (15')
Office
Area 10bArea 10a
Office
Maintenance
6th Street
5th Street
4th Street
Mission Inn Ave.

Area 8e
S4

0.1 (5')
S1

0.16 (15')
S5

0.10 (15')
S3

0.18 (15')
Area 11a Area 11b
Area 8f
Commerce Street
Commercial
Building
Area 8d
Existing
Building
2981 Mission Inn
Residence
2968 6th Street
Vacant Lot
2981 6th Street
Residence
2950 5th Street
Residence (No Access)
S14

0.11 (15')
Area 8a
Area 1
ES1
ND
ES3B
ND
S2
ND
S6

0.22 (15')

APPROXIMATE SCALE IN FEET
0 100 200
LEGEND
Soil Gas Sampling Locations (Amec 2015)
N
Maximum TCE Concentrations Shown in ug/L.

Concentrations >0.24 ug/L Shown inRED.

ES2

0.1 (15')
FIGURE 9B

DISTRIBUTION OF TCE IN SOIL GAS

0.11 (15')
Area 8b
Area 12
S16

0.13 (12')
S13
ND
S11
ND
S10

0.19 (5')S7
ND
S8
ND
Area 8c
S9

0.43 (15')
S15
ND
S12

0.12 (15')
Office
Area 10bArea 10a
Office
Maintenance
6th Street
5th Street
4th Street
Mission Inn Ave.

Area 8e
S4
ND
S1

0.31 (15')
S5

0.16 (15')
S3

0.41 (15')
Area 11a Area 11b
Area 8f
Commerce Street
Commercial
Building
Area 8d
Existing
Building
2981 Mission Inn
Residence
2968 6th Street
Vacant Lot
2981 6th Street
Residence
2950 5th Street
Residence (No Access)
S14
ND
Area 8a
Area 1
ES1
ND
ES3B
ND
S2

0.11 (15')
S6

0.57 (15')
Soil Gas Probe
Designation
Depth
(feet bgs)
Purge
Volume
(µg/L)
Date Chloro-
methane Freon 12 Freon 11 TCE PCE IPA Gasoline Range
Organics
390 440 3,100 3 2.1 880 NA
--- --- 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 --- --- 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S1 5 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S1 15 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 0.31 0.16 ND<1.0 ND<10 S2 5 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S2 15 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 0.11 ND<0.10 ND<1.0 ND<10 S3 5 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S3 15 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 0.37 0.17 ND<1.0 ND<10 S3 15 Dup 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 0.41 0.18 ND<1.0 ND<10 S4 5 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 0.10 ND<1.0 ND<10 S4 15 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S5 5 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S5 15 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 0.16 0.10 ND<1.0 ND<10 S6 5 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 0.14 0.14 ND<1.0 ND<10 S6 15 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 0.57 0.22 ND<1.0 ND<10 S7 5 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S7 15 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 0.12 ND<1.0 ND<10 S8 5 3 10/1/2015 ND<0.10 ND<0.10 0.12 ND<0.10 ND<0.10 ND<1.0 ND<200 S8 15 3 10/1/2015 ND<0.10 ND<0.10 0.18 ND<0.10 0.39 ND<1.0 ND<10 S9 5 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S9 15 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 0.43 0.19 ND<1.0 ND<10 S10 5 3 10/2/2015 ND<0.10 ND<0.10 0.21 0.19 ND<0.10 ND<1.0 ND<10 S10 15 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S11 5 3 10/1/2015 ND<0.10 ND<0.10 1.9 ND<0.10 ND<0.10 ND<1.0 ND<10 S11 15 3 10/1/2015 ND<0.10 ND<0.10 2.6 ND<0.10 0.12 ND<1.0 ND<10 S11 15 Dup 3 10/1/2015 ND<0.10 ND<0.10 2.6 ND<0.10 0.12 ND<1.0 ND<10 S12 5 3 10/1/2015 ND<0.10 ND<0.10 1.1 ND<0.10 ND<0.10 ND<1.0 ND<10 S12 15 3 10/1/2015 ND<0.10 ND<0.10 1.5 0.12 0.10 ND<1.0 ND<10 S13 (see notes) 5
3 10/1/2015 0.49 0.28 15 ND<0.10 0.21 ND<1.0 ND<10
S13 (See notes) 15 3 10/1/2015 ND<0.10 0.34 12 ND<0.10 0.18 ND<1.0 ND<10 S14 5 3 10/2/2015 ND<0.10 ND<0.10 0.16 ND<0.10 ND<0.10 ND<1.0 ND<10 S14 15 3 10/2/2015 ND<0.10 ND<0.10 0.11 ND<0.10 0.11 ND<1.0 ND<10 S15 5 3 10/1/2015 ND<0.10 ND<0.10 1.4 ND<0.10 ND<0.10 ND<1.0 ND<10 S15 15 3 10/1/2015 ND<0.10 ND<0.10 1.0 ND<0.10 ND<0.10 ND<1.0 ND<10 S16A 5 3 10/2/2015 ND<0.10 ND<0.10 3.5 ND<0.10 0.12 ND<1.0 ND<10 S16A 12 3 10/2/2015 ND<0.10 ND<0.10 3.0 0.13 0.22 ND<1.0 ND<10 S17 5 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S17 15 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 0.11 0.11 ND<1.0 ND<10 Ambient Air
TABLE 7

SUMMARY OF VOLATILE ORGANIC COMPOUNDS (VOCS) AND GASOLINE RANGE ORGANICS (GRO) IN SOIL GAS Riverside Scrap Iron & Metal Site
Riverside, California
Results reported in micrograms per liter (µg/L)
Industrial RSLs or DTSC-modified Screeing Level
P:\10468.000.0\10468.004.0\Docs\Additional Phase II ESA Report\Tables\Tables Amec Foster Wheeler

Page 1 of 2 ends

Soil Gas Probe
Designation
Depth
(feet bgs)
Purge
Volume
(µg/L)
Date Chloro-
methane Freon 12 Freon 11 TCE PCE IPA Gasoline Range
Organics
TABLE 7

SUMMARY OF VOLATILE ORGANIC COMPOUNDS (VOCS) AND GASOLINE RANGE ORGANICS (GRO) IN SOIL GAS Riverside Scrap Iron & Metal Site
Riverside, California
Results reported in micrograms per liter (µg/L)
S18 5 3 10/2/2015 ND<0.10UJ ND<0.10U
J 0.62J ND<0.10UJ ND<0.10UJ 3.3J ND<10
S18 15 3 10/2/2015 ND<0.10 ND<0.10 0.50 ND<0.10 ND<0.10 ND<1.0 ND<10 S18 15 Dup 3 10/2/2015 ND<0.10 ND<0.10 0.46 ND<0.10 ND<0.10 ND<1.0 ND<10 S19 5 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S19 15 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 ES1 5 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 ES1 15 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 ES2 5 3 10/2/2015 ND<0.10 ND<0.10 0.78 ND<0.10 2.0 ND<1.0 ND<10 ES2 15 3 10/2/2015 ND<0.10 ND<0.10 0.69 0.10 1.1 ND<1.0 ND<10 ES3B 5 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 ES3B 5 Dup 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 ES3B 11.25 3 10/2/2015 ND<0.10 ND<0.10 0.19 ND<0.10 ND<0.10 ND<1.0 ND<10 Notes and Data Qualifiers
Volatile Organic Compounds (VOCs) and Gasoline Range Organics (GRO) were analyzed using United States Environmental Protection Agency (EPA) Method 8260M. All remaining VOCs were not detected. For a complete list of EPA 8260M analytes, see laboratory reports.

The Regional Screening Levels (RSLs) are from the EPA Region 9, revised June 2015, http://www.epa.gov/region9/superfund/prg/. RSLs were adjusted for a default (DTSC, 2011) attenuation factor for existing commercial buildings by multiplying the air RSLs by 1000 (representing a soil vapor-to-indoor air attenuation factor of 0.001. Therefore, the soil vapor screening levels presented are protective of existing buildings. The DTSC-modified screening level (DTSC, 2015) was used for PCE (italicized) because it was more conservative than the USEPA RSL.

S13 at 5 bgs and S13 at 15 feet bgs -Freon 11 concentrations from soil vapor samples exceeded the laboratory instrument calibration range. The samples were re-run at a higher dilution rate to quantify Freon 11 concentrations.

J - The analyte was positively identified. However, the leak detection compound IPA was detected in the sample at a concentration greater than 10 times the reporting limit of target analytes and therefore, the detected value is estimated.

UJ - The analyte was reported as not detected at the laboratory reporting limit. However, the leak detection compound IPA was detected in the sample at concentration greater than 10 times the reporting limit of the target analytes and therefore, the reporting limit is estimated.

Abbreviations
bgs = Below ground surface IPA = Isopropanol
ND = Not detected at the reporting limit shown NA = Not available DUP = Duplicate sample PCE = Tetrachloroethene
DTSC = Department of Toxic Substances Control RSL = Regional Screening Level Freon 11 = Trichlorofluoromethane TCE = Trichloroethene Freon 12 = Dichlorodifluoromethane µg/L = Micrograms per liter References
DTSC, 2015, Human Health Risk Assessment (HHRA) Note #3, DTSC-modified Screening Levels (DTSC-SLs), Human and Ecological Risk Office (HERO), October.

DTSC, 2011, Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air, October.

P:\10468.000.0\10468.004.0\Docs\Additional Phase II ESA Report\Tables\Tables Amec Foster Wheeler

Page 2 of 2 ends

ADDENDUM TO THE RESULTS OF SOIL

VAPOR INVESTIGATION

FORMER RIVERSIDE SCRAP IRON & METAL PROPERTY
2993 6th Street
Riverside, California 92507
Department of Toxic Substances Control Docket No HAS-FY21/22-032

Issued: July 11, 2023

Prepared for: IRON LOFTS LLC
1201 Dove Street, Suite 520
Newport Beach, California 92660

Prepared by: GSI ENVIRONMENTAL INC.
19200 Von Karman Avenue, Suite 800
Irvine, California 92612
949.679.1070
www.gsienv.com

ADDENDUM TO THE RESULTS OF

SOIL VAPOR INVESTIGATION

FORMER RIVERSIDE SCRAP IRON & METAL PROPERTY
2993 6th Street
Riverside, California 92507
Department of Toxic Substances Control Docket No HAS-FY21/22-032

This Addendum to the Results of Soil Vapor Investigation was prepared by the staff of GSI Environmental Inc., under the supervision of the Engineer(s) and/or Geologist(s) whose signatures appear hereon.

The findings, recommendations, specifications, or professional opinions were prepared in accordance with generally accepted professional engineering and/or geologic practice. No warranty is expressed or implied.

Issued: July 11, 2023

Timothy F. Wood, PG, CHG
Vice President & Principal Geologist

Peter Scaramella
Senior Risk Assessor

Samantha Curtis, PG
Senior Geologist

GSI Job No.: 6239
Issued: July 11, 2023

ADDENDUM TO THE RESULTS OF SOIL VAPOR INVESTIGATION
Former Riverside Scrap Iron & Metal Property
2993 6th Street
Riverside, California 92507

TABLE OF CONTENTS

Former Riverside Scrap Iron & Metal Property i Addendum to the Results of Soil Vapor Investigation

1.0 INTRODUCTION ................................................................................................................. 1

2.0 BACKGROUND ................................................................................................................... 1

3.0 SCOPE OF WORK .............................................................................................................. 2

3.1 Pre-field Activities .......................................................................................................... 2

3.2 Soil Vapor Sampling and Analysis ................................................................................. 2

4.0 SOIL VAPOR SAMPLE RESULTS ...................................................................................... 3

4.1 Data Quality Summary .................................................................................................. 3

4.2 Soil Vapor Results ......................................................................................................... 3

5.0 SUMMARY AND CONCLUSIONS ....................................................................................... 6

6.0 REFERENCES .................................................................................................................... 8

TABLES
Table 1. Analytical Results for Volatile Organic Compounds in Soil Vapor Samples

FIGURES
Figure 1. Site Location Map
Figure 2. Site Map with Sample Locations
Figure 3. PCE and TCE Concentrations in Soil Vapor (µg/m3)

APPENDICES
Appendix A. 2015 Soil Vapor Data Table and Figure (AMEC, 2015) Appendix B. Analytical Laboratory Reports – Soil Vapor

GSI Job No.: 6239
Issued: July 11, 2023

Former Riverside Scrap Iron & Metal Property

1 Addendum to the Results of Soil Vapor Investigation

ADDENDUM TO THE RESULTS OF SOIL VAPOR INVESTIGATION
Former Riverside Scrap Iron & Metal Property
2993 6th Street
Riverside, California 92507

1.0 I NTRODUCTION
On behalf of Iron Lofts LLC (Iron Lofts), GSI Environmental Inc. (GSI) has prepared this Addendum to the Results of Soil Vapor Investigation (GSI, 2023; SVI Report Addendum) for the former Riverside Scrap Iron & Metal (RSIM) property located at 2993 6 th Street in Riverside, California (the Site; Figures 1 and 2). This report presents the results of soil vapor sampling conducted at the Site in May 2023, and is an addendum to GSI’s Soil Vapor Investigation Report (SVI Report) dated January 17, 2023, which reported the results of soil vapor sampling completed in November 2022. This SVI Report Addendum summarizes the results of a th ird soil vapor sampling event to further evaluate the presence of tetrachloroethene ( PCE) and trichloroethene (TCE) in soil vapor.

Soil vapor sampling events conducted at the Site to date include the following:
• Soil vapor sampling event No. 1 – October 2015 (temporary probe locations) • Soil vapor sampling event No. 2 – November 2022 (semi-permanent probe locations) • Soil vapor sampling event No. 3 – May 2023 (subset of semi-permanent probes from soil vapor sampling event No. 2)
Semi-permanent soil vapor sample probes installed across the Site in November 2022 included locations in the vicinity of the 2015 temporary soil vapor prob es that targeted potential on- Site source locations . For the May 2023 sampling event, soil vapor probes were selected for resampling based on concentrations of PCE and TCE detected in 2015 and 2022 that were higher relative to other areas of the Site. The results of the May 2023 sampling event are used to evaluate the temporal variability of PCE and TCE in soil vapor at the Site.

Additional discussion regarding the evaluation of risk to future development due to detected concentrations of VOCs in soil vapor at the Site is included in the Response Plan (GSI, 2023).

2.0 BACKGROUND
Soil vapor sampling was completed at locations throughout the Site in October 2015 and November 2022 (AMEC, 2015; GSI, 2023a). Specifically, in October 2015, 44 primary soil vapor samples (and 4 duplicate soil vapor samples) were collected from 22 locations installed at depths ranging between 5 and 15 feet below grade. PCE and TCE were the primary volatile organic compounds (VOCs) detected in soil vapor samples. PCE was detected in 18 soil vapor samples, but at relatively low concentrations (up to 2,000 µg/m3, and less than 400 µg/m3 in all but two samples). TCE was detected less frequently (12 samples) at generally similar concentrations (up to 570 µg/m3). In general, concentrations increased with depth and no on- Site source was identified (AMEC, 2015).

In November 2022, 47 primary soil vapor samples (and 2 duplicate soil vapor samples) were collected from 21 locations installed at depths ranging between 5 and 30 feet bgs. PCE and TCE were the primary VOCs detected in soil vapor samples. PCE was detected in every soil vapor sample, but at relatively low concentrations (up to 840 µg/m3). TCE was detected less frequently (43 of 49 total samples), but at slightly higher concentrations (up to 1,700 µg/m3).

In general, PCE and TCE concentrations increased with depth at all soil vapor sample locations (i.e., higher concentrations were detected in deeper soil vapor samples) with the exception of two locations (VP-4 and VP-5). The highest PCE and TCE concentrations in soil vapor were observed GSI Job No.: 6239
Issued: July 11, 2023

Former Riverside Scrap Iron & Metal Property

2 Addendum to the Results of Soil Vapor Investigation

from soil vapor samples collected at 30 feet bgs at the southwestern and northeastern property boundary of the southern parcel and southeastern property boundary of the central parcel.

A source of PCE or TCE to soil vapor was not identified on the Site and the low concentrations of PCE and TCE detected in soil vapor samples and increasing concentrations with depth were not considered indicative of an on-Site release. As previously noted in GSI’s January 2023 Soil Vapor Investigation Report, it is possible that the low concentrations are attributed to minor releases associated with historical on-Site operations and/or an off-Site release that is migrating in deeper soil vapor or groundwater to the Site.

Based on the results of the November 2022 soil vapor investigation and discussion with DTSC, the additional soil vapor sampling performed in May 2023 and described herein was collected to further evaluate concentrations of VOCs in soil vapor to support project planning for the proposed Site multi-family residential redevelopment.

3.0 SCOPE OF WORK
During the November 2022 soil vapor sampling event, multi-depth soil vapor probes were installed at 21 locations and 47 soil vapor samples were collected from the following depths:
• 5 feet: VP-1 through VP-21 (21 locations)
• 13 to 15 feet: VP-1 through VP-14 and VP-16 through VP-21 (20 locations) • 22 to 30 feet: VP-1, VP-9, VP-12, VP-14, VP-19, and VP-20 (6 locations) During the May 2023 soil vapor sampling event, a subset of 8 of the 21 previously sampled multi- depth soil vapor probe locations were resampled and analyzed for VOCs. Soil vapor probe installation and sampling was performed in accordance with the Cal-EPA July 2015 Advisory for Active Soil Gas Investigations (Advisory).

The results of analysis for November 2022 and May 2023 soil vapor samples are included in Table 1 and on Figure 3. The results of analysis for October 2015 soil vapor samples are included in Appendix A (AMEC, 2015).

3.1 Pre-field Activities
Prior to the May 2023 sampling activities, the Site-Specific Health and Safety Plan (HASP) was reviewed in accordance with the requirements of the State of California General Industry Safety Order 5192 and Title 29 of the Code of Federal Regulations, Section 1910.120. The HASP was kept on-Site during field activities.

3.2 Soil Vapor Sampling and Analysis
Prior to the commencement of sampling, shut-in tests were conducted on the soil vapor probes.

The probe heads were attached to the sampling train assembly of tubing, valves, and fittings and connected to a purge pump. A minimum vacuum of 100 inches of water column (W.C.) w as applied to the sealed sampling train and monitored for at least 1 minute. After a successful shut- in test was completed, the soil vapor probe and sampling train w as purged. A total of 3 purge volumes were removed from soil vapor probes prior to sampling. Each soil vapor probe was purged at a rate of 200 milliliters per minute (mL/min) and at a vacuum less than of 100 inches W.C. One purge volume is equal to the internal sample tubing volume and volume of stagnant air within the sand pack and dry bentonite layers (assuming 40 percent porosity). During purging and sampling, 1,1 -difluoroethane (DFA) was applied as a leak -check tracer gas to check for ambient air leaks near the above-ground probe tubing and sampling train.

GSI Job No.: 6239
Issued: July 11, 2023

Former Riverside Scrap Iron & Metal Property

3 Addendum to the Results of Soil Vapor Investigation

Following the completion of purging, soil vapor samples were collected into Summa canisters through flow controller s at a rate of approximately 200 mL/min. Duplicate soil vapor samples were collected at a frequency of one per day.

Soil vapor samples w ere analyzed for VOCs using United States Environmental Protection Agency (USEPA) Method TO-15.

4.0 SOIL VAPOR SAMPLE RESULTS
This section presents the results of soil vapor sampling and analysis, including a presentation of the analytical results, and a comparison of analytical results to risk -based screening criteria.

Analytical results for soil vapor samples are presented in Table 1. The analytical laboratory reports for soil vapor samples are presented in Appendix B.

4.1 Data Quality Summary
Analytical results for soil vapor sampling were reviewed to determine the data usability. Each laboratory data package was reviewed consistent with guidance provided by the USEPA. A sample evaluation was completed for primary and duplicate soil vapor samples and did not identify any issues . The following quality assurance/quality control (QA/QC) criteria from the analysis of the project samples were reviewed as applicable: sample preservation and holding time compliance, reporting limits and sample dilution, blank sample analysis, surrogate recovery compliance, laboratory control samples, field duplicate samples and use of laboratory data qualifiers. No data qualifiers were applied based on the results of the data validation review.

Field quality control measures included leak testing with DFA and the collection of a split- t duplicate pair of soil vapor samples. The leak test compound DFA was evaluated by comparison to an action level of 10,000 μg/m3, which is equivalent to 3.7 parts per million by volume (ppmv).

DFA was not detected in any soil vapor samples in this sampling round.

4.2 Soil Vapor Results
Soil vapor samples were collected at eight locations from soil vapor probes with inlets installed at depths between 5 and 30 feet bgs in May 2023 (Figure 2).

Initial Soil Vapor Data Screening
Analytical results for soil vapor samples are evaluated by comparison to risk -based screening levels for residential and commercial/industrial Site use. Screening levels (SLs) for soil vapor are developed by applying an attenuation factor to screening levels for indoor air:

Soil Vapor Screening Level (SLsv)= SLia
AF
Where:

SLsv = Soil v
apor screening level (µg/m3)
SLia = Indoor air screening level (µg/m3)
AF = Attenuation factor (unitless)

Soil vapor SLs were calculated using the default attenuation factor published by DTSC for residential and commercial use (0.03; DTSC & State Water Resources Control Board [SWRCB], 2023); these soil vapor SLs are referred to in this report as the “DTSC SLs.” Soil vapor data are evaluated by comparison to the DTSC SLs for an initial screening of soil vapor data.

GSI Job No.: 6239
Issued: July 11, 2023

Former Riverside Scrap Iron & Metal Property

4 Addendum to the Results of Soil Vapor Investigation

As shown in Table 1, PCE, TCE, 1,2 -dichloroethene (1,2-DCA), and chloroform were the only VOCs detected in at least one soil vapor sample at a concentration exceeding its DTSC AF SL, and the results for these VOCs are summarized below:
• PCE was detected in all soil vapor samples collected at concentrations ranging from 63 to 850 µg/m

3. The highest PCE concentrations in soil vapor were observed in the soil vapor samples collected at 30 feet bgs at the southwestern and northeastern property boundary of the southern parcel ( 850 µg/m3 at VP-1-30 REP, 810 µg/m3 at VP-1-30, 640 µg/m3 at VP-9-30, and 840 µg/m3 at VP-19-30) and southeastern property boundary of the central parcel (780 µg/m3 at VP-20-30). All soil vapor samples exceed the DTSC AF SL of 15 µg/m3.
• TCE was detected in 22 of 23 total soil vapor samples at concentrations ranging from 6 to 2,100 µg/m3. The highest TCE concentrations in soil vapor were also observed in the soil vapor samples with the highest PCE concentrations. Specifically, TCE was detected at the highest concentrations in the soil vapor samples collected at 30 feet bgs at the southwestern and northeastern property boundary of the southern parcel (2,000 µg/m3 at VP-1-30 REP and 1,900 µg/m 3 at VP-1-30, 1,600 µg/m3 at VP-9-30, and 1,700 µg/m3 at VP-19-30) and southeastern property boundary of the central parcel ( 2,100 µg/m3 at VP- 20-30). All soil vapor samples with detections of TCE except for one (6 µg/m3 at VP-9-5) exceed the DTSC AF SL of 16 µg/m3.
• 1,2-DCA was detected in one soil vapor samples at a concentrations of 17 µg/m3, which exceeds the DTSC AF SL of 3.7 µg/m3
• Chloroform was detected in four soil vapor samples at concentrations ranging from 19 to 24 µg/m3, all of which exceed the DTSC AF SL of 4.0 µg/m3.

Temporal and Spatial Variability
Semi-permanent soil vapor sample probes were installed and sampled across the Site in November 2022 and included locations near the 2015 temporary soil vapor probes that targeted potential on-Site source areas. For the May 2023 sampling event, soil vapor probes were selected for resampling based on concentrations of PCE and TCE in 2015 and 2022 that were higher relative to other areas of the Site, and included 2022 sampling locations with triple- nested soil vapor probes. The results of the May 2023 sampling event are used to evaluate the temporal variability of PCE and TCE in soil vapor at the Site.

Results identified in Exhibit A and B, below, and in Table 1, do not indicate any significant temporal variation in PCE or TCE concentrations between the November 2022 and May 2023.

GSI Job No.: 6239
Issued: July 11, 2023

Former Riverside Scrap Iron & Metal Property

5 Addendum to the Results of Soil Vapor Investigation

Exhibit A. Temporal Trends for PCE – November vs. May

Exhibit A. Temporal Trends for TCE – November vs. May

0 100
200
300
400
500
600
700
800
900CONCENTRATION (µg/m3)
5/18/2023 11/16/2022
0 500
1000
1500
2000
2500CONCENTRATION (µg/m3)
5/18/2023 11/16/2022
GSI Job No.: 6239
Issued: July 11, 2023

Former Riverside Scrap Iron & Metal Property

6 Addendum to the Results of Soil Vapor Investigation

Consistent with the November 2022 soil vapor sampling event, the highest PCE and TCE concentrations in soil vapor were observed from soil vapor samples collected at 30 feet bgs at the southwestern and northeastern property boundary of the southern parcel and southeastern property boundary of the central parcel . Concentrations increased with depth at all soil vapor sample locations (i.e., higher concentrations were detected in deeper soil vapor samples) with the exception of two locations (VP -4 and VP-5; Exhibit C). In October 2015, soil vapor samples were collected at 5 and 15 feet only, and also in general had higher reported soil vapor concentrations in the deeper samples.

Exhibit C. 2022 and 2023 Maximum Concentrations of PCE and TCE by Depth (µg/m3)

PCE TCE
Maximum Detected Concentration (All depth) 850 2100
Soil Vapor Samples collected at 5 feet bgs 280 190
Soil Vapor Samples collected at 13 to 15 feet bgs 460 770 Soil Vapor Samples collected at 22 to 30 feet bgs 850 2100

5.0 SUMMARY AND CONCLUSIONS
Soil vapor sampling was completed throughout the Site in October 2015 (22 locations) and November 2022 (21 locations), and sampling was repeated in May 2023 at eight of the 2022 sampling locations, which are distributed across the Site and include dual- and triple-nested soil vapor probe locations.

During the first soil vapor sampling event in October 2015, 44 primary soil vapor samples were collected from 22 locations installed at depths ranging between 5 and 15 feet. During the second soil vapor sampling event in November 2022, 47 primary soil vapor samples were collected from 21 locations installed at depths ranging between 5 and 30 feet. During the third sampling event in May 2023, 23 primary soil vapor samples were collected from 8 of the locations previously identified with higher concentrations of PCE and/or TCE relative to the other probes at the Site.

The key findings of the May 2023 soil vapor sampling event are summarized below:
• PCE and TCE were the primary VOCs detected in soil vapor samples. PCE was detected in every soil vapor sample with concentrations (up to 850 µg/m 3) above the residential
DTSC AF SL . TCE was detected in all but one sample (22 of 23 total samples), but at slightly higher concentrations (up to 2,100 µg/m3).
• PCE and TCE concentrations at the resampled locations in the May 2023 sampling event all increase with depth, as seen in the November 2022 and October 2015 sampling events, and are consistent with the November 2022 and October 2015 sample results. • PCE and TCE concentrations in soil vapor are consistent with an off-Site source. o A source of PCE or TCE to soil vapor was not identified on the Site. o Concentrations increase with depth at all resampled soil vapor sample locations (i.e., higher concentrations were detected in deeper soil vapor samples). o The highest PCE and TCE concentrations in soil vapor were observed from soil vapor samples collected at 30 feet bgs at the southwestern and northeastern property boundary of the southern parcel and southeastern property boundary of the central parcel.

GSI Job No.: 6239
Issued: July 11, 2023

Former Riverside Scrap Iron & Metal Property

7 Addendum to the Results of Soil Vapor Investigation

Analysis of three rounds of soil vapor investigation does not identify a source of PCE and TCE at the Site. Additionally, no evidence of significant temporal variability in concentrations of PCE or TCE is identified in the samples analyzed from 2015 to 2023. Low concentrations of PCE and TCE detected in soil vapor samples and increasing concentrations with depth are not indicative of an on-Site release. It is possible that the low concentrations are attributed to minor releases associated with historical on-Site operations and/or an off-Site release that is migrating in deeper soil vapor or groundwater to the Site.

Based on the consistent and relatively low concentrations of VOCs in Site soil vapor over the approximately 8- year soil vapor sampling period, and the increasing concentrations with depth, no further action is recommended to support planned residential redevelopmen t.

Additional discussion regarding the evaluation of risk to future development due to detected concentrations of VOCs in soil vapor at the Site is included in the Response Plan (GSI, 2023).

GSI Job No.: 6239
Issued: July 11, 2023

Former Riverside Scrap Iron & Metal Property

8 Addendum to the Results of Soil Vapor Investigation

6.0 REFERENCES
AMEC Foster Wheeler (AMEC), 2015, Additional Phase II Environmental Site Assessment Report, Riverside Scrap Iron & Metal Site, Riverside, California, December 9.

California Environmental Protection Agency, 2015, Advisory – Active Soil Gas Investigations, July Department of Toxic Substances Control (DTSC) , 2011. Guidance for the evaluation and mitigation of subsurface vapor intrusion to indoor air (vapor intrusion guidance). California Environmental Protection Agency. October.

DTSC, 2022, DTSC Vapor Intrusion Advisory, https://dtsc.ca.gov/wp- content/uploads/sites/31/2022/08/Vapor-Intrusion-Update-August-2022-006.pdf, August.

Department of Toxic Substances Control (DTSC), 2022. Human Health Risk Assessment (HHRA) Note 3, HHRA Note 3, DTSC- modified Screening Levels (DTSC -SLs). California Environmental Protection Agency. May.

GSI, 2023, Soil Vapor Investigation Report, Former Riverside Scrap Iron & Metal Property, 2993 6th Street, Riverside, California 92507, January 17.

United States Environmental Protection Agency (U.S. EPA). 1989. Risk Assessment Guidance for Superfund, Volume 1, Human Health Evaluation Manual (Part A). Interim Final.

EPA/540/I-89/002. December.

United States Environmental Protection Agency (U.S. EPA). 2022. Regional Screening Levels.

November.

GSI Job No.: 6239

Former Riverside Scrap Iron & Metal Property Addendum to the Results of Soil Vapor Investigation

TABLE
Table 1. Analytical Results for Volatile Organic Compounds in Soil Vapor Samples

GSI Job No. 6239

Page 1 of 2 ends

Former Riverside Scrap Iron & Metal Property
Riverside, California
Sample Location Sample ID
Probe Depth
(feet bgs) Date Sampled Units
Tetrachloroethene
(PCE)
Trichloroethene
(TCE)
Chloroform
1,1-Dichloroethene
(1,1-DCE)
1,2-Dichloroethane
(1,2-DCA)
Benzene
Ethylbenzene
Toluene
Xylene
1,1,1-Trichloroethane
1,1,2-Trichloro-
trifluoroethane (F113)
1,2,4-
Trimethylbenzene
2-Butanone (MEK)
Carbon disulfide
Dichloro-
difluoromethane (F12)
Methylene chloride
(Dichloromethane)
Trichloro-
fluoromethane (F11)
1,1-difluoroethane
(DFA) (leak check
compound)
VP-1-5 5 11/16/2022 µg/m3 150 97 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 94 <5 <30 <6.3 <5 <3.5 22 <5.5 VP-1-5 5 5/18/2023 µg/m3 280 190 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 170 <5 <30 <6.3 <5 <3.5 38 <5.5 VP-1-15 15 11/16/2022 µg/m3 390 680 12 49 <4.1 25 <4.4 6.3 <8.8 <5.5 290 <5 69 69 <5 <3.5 66 <5.5 VP-1-15 15 5/18/2023 µg/m3 380 700 <4.9 44 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 280 <5 <30 <6.3 5.4 <3.5 62 <5.5 VP-1-30 30 11/16/2022 µg/m3 720 1700 20 120 <4.1 8.7 <4.4 4.4 <8.8 <5.5 370 <5 54 20 8.5 <3.5 85 <5.5 VP-1-30 30 5/18/2023 µg/m3 810 1900 20 120 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 390 <5 <30 <6.3 <5 <3.5 91 <5.5 VP-1-30 REP 30 5/18/2023 µg/m3 850 2000 21 120 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 410 <5 <30 <6.3 <5 <3.5 96 <5.5 VP-2-5 5 11/16/2022 µg/m3 110 48 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 72 <5 <30 7.5 <5 <3.5 23 <5.5 VP-2-15 15 11/16/2022 µg/m3 450 510 33 17 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 210 <5 <30 7.4 8.2 <3.5 56 <5.5 VP-3-5 5 11/16/2022 µg/m3 12 28 11 <4 <4.1 6.7 <4.4 14 <8.8 <5.5 8.3 <5 <30 19 <5 9.1 5.9 14 VP-3-15 15 11/16/2022 µg/m3 240 250 23 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 140 <5 <30 <6.3 7.9 <3.5 66 <5.5 VP-4-5 5 11/17/2022 µg/m3 35 19 <4.9 <4 <4.1 <3.2 <4.4 11 <8.8 <5.5 15 <5 <30 67 <5 <3.5 64 <5.5 VP-4-15 15 11/17/2022 µg/m3 180 13 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 26 <5 <30 <6.3 <5 <3.5 99 <5.5 VP-5-5 5 11/17/2022 µg/m3 12 180 17 <4 <4.1 6.3 <4.4 23 4.9 <5.5 <7.7 <5 <30 71 <5 26 60 <5.5 VP-5-15 15 11/17/2022 µg/m3 110 11 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 20 <5 <30 <6.3 6.7 <3.5 220 <5.5 VP-6-5 5 11/17/2022 µg/m3 39 <5.5 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 35 <5 <30 <6.3 7.8 <3.5 91 <5.5 VP-6-13 13 11/17/2022 µg/m3 140 32 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 39 <5 <30 73 7.2 <3.5 100 <5.5 VP-7-5 5 11/17/2022 µg/m3 47 14 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 <7.7 <5 <30 <6.3 <5 <3.5 53 <5.5 VP-7-15 15 11/17/2022 µg/m3 210 40 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 26 <5 <30 <6.3 6.1 <3.5 180 <5.5 VP-8-5 5 11/17/2022 µg/m3 30 <5.5 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 <7.7 <5 <30 <6.3 <5 <3.5 14 520 VP-8-15 15 11/17/2022 µg/m3 140 190 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 50 <5 <30 52 6.8 5.3 85 <5.5 VP-9-5 5 11/16/2022 µg/m3 71 17 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 51 <5 <30 15 <5 <3.5 13 <5.5 VP-9-5 5 5/18/2023 µg/m3 63 6 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 51 <5 <30 91 29 <3.5 14 <5.5 VP-9-15 15 11/16/2022 µg/m3 250 380 6.4 6.5 <4.1 6.2 <4.4 4.7 <8.8 <5.5 230 <5 40 29 6.8 <3.5 53 <5.5 VP-9-15 15 5/18/2023 µg/m3 200 280 <4.9 9.0 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 210 <5 <30 <6.3 <5 <3.5 48 <5.5 VP-9-30 30 11/16/2022 µg/m3 670 1700 20 110 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 370 <5 62 12 8.4 <3.5 86 <5.5 VP-9-30 30 5/18/2023 µg/m3 640 1600 19 100 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 350 <5 <30 <6.3 <5 <3.5 79 <5.5 VP-10-5 5 11/16/2022 µg/m3 80 70 <4.9 <4 <4.1 3.5 <4.4 <3.8 <8.8 <5.5 37 <5 <30 8 <5 <3.5 23 <5.5 VP-10-15 15 11/16/2022 µg/m3 270 430 <4.9 17 <4.1 <3.2 <4.4 4.3 <8.8 <5.5 99 <5 <30 13 6.3 <3.5 51 <5.5 VP-11-5 5 11/16/2022 µg/m3 89 29 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 95 <5 <30 <6.3 5.3 <3.5 34 <5.5 VP-11-5 5 5/18/2023 µg/m3 92 44 <4.9 <4 <4.1 <3.2 <4.4 3.9 <8.8 <5.5 180 <5 <30 <6.3 <5 <3.5 53 <5.5 VP-11-15 15 11/16/2022 µg/m3 460 770 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 240 <5 <30 <6.3 7.9 <3.5 90 <5.5 VP-11-15 15 5/18/2023 µg/m3 380 650 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 220 <5 <30 <6.3 <5 <3.5 78 <5.5 VP-12-5 5 11/17/2022 µg/m3 94 <5.5 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 27 <5 <30 <6.3 <5 <3.5 68 <5.5 VP-12-5 5 5/18/2023 µg/m3 82 <5.5 <4.9 <4 <4.1 <3.2 <4.4 4.1 <8.8 <5.5 46 <5 <30 <6.3 <5 <3.5 140 <5.5 VP-12-15 15 11/17/2022 µg/m3 210 73 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 50 <5 <30 13 8.7 <3.5 100 <5.5 VP-12-15 15 5/18/2023 µg/m3 150 66 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 54 <5 <30 <6.3 <5 <3.5 170 <5.5 VP-12-30 30 11/17/2022 µg/m3 330 310 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 79 <5 32 <6.3 10 <3.5 230 <5.5 VP-12-30 30 5/18/2023 µg/m3 270 300 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 77 <5 <30 <6.3 <5 <3.5 240 <5.5 VP-13-5 5 11/17/2022 µg/m3 40 20 <4.9 <4 <4.1 3.4 <4.4 6.9 <8.8 <5.5 14 <5 <30 32 <5 3.6 180 <5.5 VP-13-15 15 11/17/2022 µg/m3 120 36 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 22 <5 <30 <6.3 8.2 <3.5 410 <5.5 VP-14-5 5 11/17/2022 µg/m3 160 94 5.9 <4 <4.1 15 6.3 77 20.1 <5.5 21 7.9 <30 120 8.4 6.2 200 <5.5 VP-14-5 5 5/18/2023 µg/m3 250 58 <4.9 <4 <4.1 <3.2 <4.4 3.8 <8.8 <5.5 36 <5 <30 21 8.8 <3.5 410 <5.5 VP-14-15 15 11/17/2022 µg/m3 460 120 <4.9 <4 <4.1 6.5 <4.4 27 23.4 <5.5 23 7.6 <30 <6.3 8.9 3.6 200 <5.5 VP-14-15 15 5/18/2023 µg/m3 350 160 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 39 <5 <30 <6.3 9.1 <3.5 470 <5.5 VP-14-22 22 11/17/2022 µg/m3 570 360 8.5 <4 <4.1 3.8 <4.4 8.7 <8.8 <5.5 51 <5 <30 16 13 <3.5 350 <5.5 VP-14-22 22 5/18/2023 µg/m3 440 350 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 49 <5 <30 <6.3 11 <3.5 580 <5.5 VP-15 VP-15-5 5 11/17/2022 µg/m3 14 <5.5 6.9 <4 17 <3.2 <4.4 <3.8 <8.8 9.4 10 <5 <30 13 <5 <3.5 460 <5.5 VP-16-5 5 11/17/2022 µg/m3 97 6.4 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 16 <5 <30 <6.3 <5 <3.5 23 <5.5 VP-16-5 5 5/18/2023 µg/m3 150 18 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 13 <5 <30 <6.3 <5 <3.5 23 <5.5 VP-16-15 15 11/17/2022 µg/m3 360 190 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 44 <5 <30 <6.3 <5 <3.5 50 <5.5 VP-16-15 15 5/18/2023 µg/m3 320 260 <4.9 <4 <4.1 <3.2 <4.4 <3.8 <8.8 <5.5 58 <5 <30 <6.3 <5 <3.5 65 <5.5 VP-1
VP-9
VP-11
VP-13
VP-12
VP-7
VP-8
VP-10
VP-16
VP-14
TABLE 1: Volatile Organic Compounds (VOCs) in Soil Vapor 1 VP-2
VP-3
VP-4
VP-5
VP-6
GSI Job No. 6239

Page 2 of 2 ends

References:
1 Soil vapor samples collected by H&P Mobile Geochemistry, Inc. (H&P) of Carlsbad, CA into batch-certified, 400 or 450 milliliter summa canisters under the field oversight of GSI Environmental Inc., and analyzed by H&P at a fixed laboratory using USEPA Method TO-15.

Residential Soil Vapor Screening Levels3 (AF=0.03)
2 Soil vapor results are compared to soil vapor screening levels generated by applying default attenuation factors (AF) for all buildings (0.03), as published by the USEPA (2015), to regional screening levels for indoor air under commercial land use published by the USEPA (2022) and modified by the DTSC (2022). 3 Soil vapor results also are compared to soil vapor screening levels generated by applying default attenuation factors (AF) for all buildings (0.03), as published by the USEPA (2015), to regional screening levels for indoor air under residential land use published by the USEPA (2022) and modified by the DTSC (2022).

California Environmental Protection Agency (Cal/EPA). 2011. Final Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air (Vapor Intrusion Guidance). DTSC. October.

VP-19
VP-20
Department of Toxic Substances Control (DTSC). 2022. Human Health Risk Assessment (HHRA) Note, HERO HHRA Note 3, DTSC-modified Screening Levels (DTSC-SLs). May.

GSI Environmental Inc. (GSI). 2019. Interim Remedial Action Plan, Former Pep Boys Property, 1721 and 1725 North Long Beach Blvd, Compton, California 90221. June.

United States Environmental Protection Agency (USEPA). 2022. Regional Screening Levels (RSLs). November.

Commercial/Industrial Soil Vapor Screening Levels2 (AF=0.03) Maximum Detected Concentration
VP-18
VP-21
VP-17
GSI Job No.: 6239

Former Riverside Scrap Iron & Metal Property Addendum to the Results of Soil Vapor Investigation

FIGURES
Figure 1. Site Location Map
Figure 2. Site Map with Sample Locations
Figure 3. PCE and TCE Concentrations in Soil Vapor (µg/m3)

GSI Job No.

Issued:

Revised:

Map ID:

Drawn by:

Chk'd by:

Aprv'd by:
0 1.5 30.75
Miles
FIGURE 1
6239
RS6239_SLM
2-Jun-2022
AV

SC SITE LOCATION MAP
Riverside Scrap Iron & Metal
Riverside, California
TFW
£
Reference map provided by Esri, 2022.

SITE

LOCATION
^_
^_
CaliforniaCalifornia
Drawn By:

Chk'd By:

Appv'd By:Map ID:

Issued:

GSI Job No.
#I
#I
%2 %2
%2 %2
%2 %2
#I
%2 %2 %2
#I
%2 #I
#I
%2
%2
%2
!.
%2

MISSION INN AVENUE
6TH STREET
5TH STREET

COMMERCE STREET
VP-1 VP-2 VP-3 VP-4 VP-5
VP-6
VP-7
VP-12
VP-8
VP-9
VP-10 VP-11 VP-13 VP-14 VP-15
VP-16
VP-17 VP-18 VP-19
VP-20
VP-21
Projected Coordinate System
Datum: NAD83
State Plane California Zone VI
Units: Feet

SOIL VAPOR

SAMPLE LOCATIONS
6239 AV
22-Nov-2022
RS6239_SVPNov22
0 10050
SCALE (Feet)
SC
SC
Riverside Scrap Iron & Metal
Riverside, California
q
LEGEND
FIGURE 2
Residential Residential Residential Residential
1) Basemap downloaded from Google Earth Pro dated
October 2016.
2) VP-6 probes were installed at 5' and 13'. VP-14 probes were installed at 5', 15', and 22'.

Notes
Site Boundary
#I 5, 15, and 30 Foot Soil Vapor Probe
%2 5 and 15 Foot Soil Vapor Probe
5 Foot Soil Vapor Probe!.

Drawn By:

Chk'd By:

Appv'd By:Map ID:

Issued:

GSI Job No.
#I
#I
%2 %2
%2 %2
%2 %2
#I
%2 %2 %2
#I
%2 #I
#I
%2
%2
%2
!.
%2

MISSION INN AVENUE
6TH STREET
5TH STREET

PCE AND TCE IN SOIL VAPOR
6239 AV
26-May-2023
RS6239_SVP_PCETCE
0 10050
SCALE (Feet)
SC
SC
Riverside Scrap Iron & Metal
Riverside, California
q
LEGEND
FIGURE 3
1) Basemap downloaded from Google Earth Pro dated
October 2016.
2) VP-6 probes were installed at 5' and 13'. VP-14 probes installed at 5', 15', and 22'.
3) Depth = feet below ground surface; < = not detected above the designated laboratory reporting limit; DUP = duplicate sample; PCE = tetrachloroethene; TCE = trichloroethene. 4) Concentrations are in micrograms per cubic meter (µg/m3) Notes
Site Boundary
#I 5, 15, and 30 Foot Soil Vapor Probe
%2 5 and 15 Foot Soil Vapor Probe
5 Foot Soil Vapor Probe!.

Sample ID Date Depth PCE TCE
5 8 <5.5
15 150 <5.511/17/2022VP-21
Sample ID Date Depth PCE TCE
5 49 7.6
15 200 11011/16/2022VP-18
Sample ID Date Depth PCE TCE
5 40 20
15 120 3611/17/2022VP-13Sample ID Date Depth PCE TCE
5 80 70
15 270 43011/16/2022VP-10
Sample ID Date Depth PCE TCE
5 39 <5.5
13 140 3211/17/2022VP-6
Sample ID Date Depth PCE TCE
5 12 180
15 110 1111/17/2022VP-5
Sample ID Date Depth PCE TCE
5 35 19
15 180 1311/17/2022VP-4
Sample ID Date Depth PCE TCE
5 12 28
15 240 25011/16/2022VP-3
Sample ID Date Depth PCE TCE
5 110 48
15 450 510VP-2 11/16/2022
Sample ID Date Depth PCE TCE
5 47 14
15 210 4011/17/2022VP-7
Sample ID Date Depth PCE TCE
5 30 <5.5
15 140 19011/17/2022VP-8
Sample ID Date Depth PCE TCE
VP-15 11/17/2022 5 14 <5.5
Sample ID Date Depth PCE TCE
5 76 55
15 (DUP) 180 300
15 180 290
VP-17 11/16/2022
Sample ID Date Depth PCE TCE
11/16/2022 5 71 17
5/18/2023 5 63 6
11/16/2022 15 250 380
5/18/2023 15 200 280
11/16/2022 30 670 1700
5/18/2023 30 640 1600
VP-9
Sample ID Date Depth PCE TCE
11/16/2022 5 89 29
5/18/2023 5 92 44
11/16/2022 15 460 770
5/18/2023 15 380 650
VP-11
Sample ID Date Depth PCE TCE
11/17/2022 5 94 <5.5
5/18/2023 5 82 <5.5
11/17/2022 15 210 73
5/18/2023 15 150 66
11/17/2022 30 330 310
5/18/2023 30 270 300
VP-12
Sample ID Date Depth PCE TCE
11/17/2022 5 160 94
5/18/2023 5 250 58
11/17/2022 15 460 120
5/18/2023 15 350 160
11/17/2022 22 570 360
5/18/2023 22 440 350
VP-14
Sample ID Date Depth PCE TCE
11/17/2022 5 97 6.4
5/18/2023 5 150 18
11/17/2022 15 360 190
5/18/2023 15 320 260
VP-16
Sample ID Date Depth PCE TCE
11/17/2022 5 91 41
5/18/2023 5 120 40
11/17/2022 15 420 380
5/18/2023 15 320 290
11/17/2022 30 840 1500
5/18/2023 30 840 1700
VP-19
Sample ID Date Depth PCE TCE
11/17/2022 5 91 51
5/18/2023 5 170 130
11/17/2022 15 450 650
5/18/2023 15 380 750
11/17/2022 30 710 1600
11/17/2022 30 750 1700
5/18/2023 30 780 2100
VP-20
Sample ID Date Depth PCE TCE
11/16/2022 5 150 97
5/18/2023 5 280 190
11/16/2022 15 390 680
5/18/2023 15 380 700
11/16/2022 30 720 1700
5/18/2023 30 810 1900
5/18/2023 30 (DUP) 850 2000
VP-1
GSI Job No.: 6239
Former Riverside Scrap Iron & Metal Property Addendum to the Results of Soil Vapor Investigation

APPENDIX A
2015 Data
Plot Date: 10/27/2015 9:55:10 AM, Plotted by: joanna.worker Drawing Path: W:\Projects\010468.000 (Riverside Scrap Iron)\010468.004 (RSI&M)\ACAD\Results-2015.dwg , Soil Gas 0 Approximate scale in meters
0 Approximate scale in feet
amec
foster
wheeler
Figure
6 Date: 10/27/2015 Project No. 010468.0040
Submitted By: grr Drawn By: jrw

VOC CONCENTRATIONS IN

SOIL GAS
Riverside Scrap Iron & Metal Site
Riverside, California
Basemap modified from a drawing by Ami Adini & Associates, dated April 2011, and an aerial photo by Eagle Aerials, dated February 2011.

Site Area designation (Geomatrix, 2005)
Building
Former building or structure
Former scrap heap
Fence or wall
Former fence or wall
Riverside Marketplace Industrial District
Riverside Scrap Metal & Iron Site
Landscaped area
Explanation
Soil sampling and soil gas probe location
(Amec Foster Wheeler, 2015)
Results at depth indicated in feet below ground
surface for Volatile Organic Compounds (VOCs)
LQPLFURJUDPVSHUOLWHU
J/

8h
S19
Notes:

1. All locations are approximate.

2. Chloromethane detected at 0.49J/LQWKH
soil gas probe S13 at depth of 5 feet below
ground surface (bgs).

3. Leak detection compound Isopropyl alcohol
detected at 3.3J/LQWKHVRLOJDVSUREHS18
at depth of 5 feet bgs.

4. Scrap heaps shown from locations identified
in January/Febrary 2011 field work
S18
Freon 12 (dichlorodifluoromethane)
Freon 11 (trichlorofluoromethane)
Trichloroethene
Tetrachloroethene
Duplicate sample
Not detected at laboratory limit of <0.10
Not sampled
Estimated concentration based on detection of leak detection compound Estimated reporting limit based on detection of leak detection compound S19
S18
S17S7
S8
S11
S13
S16A
S10
S15S12
S14
S3
S1
S2
S4
S6
S9
S5S1
Sample Name
R12
R11
TCE
PCE
DUP
ND
NS
J
UJ
S2
S17S3 S5
S4
S6
ES2
ES1
S9 S15
S7
Commerce Street
S10
S14
S8
S11
S13 (See Note 2)
S16A
ES3B
S19
S12
ES3B
ES3
ES2
ES1
S18 (See Note 3)
Soil Gas Probe
Designation
Depth
(feet bgs)
Purge
Volume
(µg/L)
Date Chloro-
methane Freon 12 Freon 11 TCE PCE IPA Gasoline Range
Organics
390 440 3,100 3 2.1 880 NA
--- --- 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 --- --- 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S1 5 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S1 15 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 0.31 0.16 ND<1.0 ND<10 S2 5 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S2 15 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 0.11 ND<0.10 ND<1.0 ND<10 S3 5 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S3 15 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 0.37 0.17 ND<1.0 ND<10 S3 15 Dup 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 0.41 0.18 ND<1.0 ND<10 S4 5 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 0.10 ND<1.0 ND<10 S4 15 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S5 5 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S5 15 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 0.16 0.10 ND<1.0 ND<10 S6 5 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 0.14 0.14 ND<1.0 ND<10 S6 15 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 0.57 0.22 ND<1.0 ND<10 S7 5 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S7 15 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 0.12 ND<1.0 ND<10 S8 5 3 10/1/2015 ND<0.10 ND<0.10 0.12 ND<0.10 ND<0.10 ND<1.0 ND<200 S8 15 3 10/1/2015 ND<0.10 ND<0.10 0.18 ND<0.10 0.39 ND<1.0 ND<10 S9 5 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S9 15 3 10/1/2015 ND<0.10 ND<0.10 ND<0.10 0.43 0.19 ND<1.0 ND<10 S10 5 3 10/2/2015 ND<0.10 ND<0.10 0.21 0.19 ND<0.10 ND<1.0 ND<10 S10 15 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S11 5 3 10/1/2015 ND<0.10 ND<0.10 1.9 ND<0.10 ND<0.10 ND<1.0 ND<10 S11 15 3 10/1/2015 ND<0.10 ND<0.10 2.6 ND<0.10 0.12 ND<1.0 ND<10 S11 15 Dup 3 10/1/2015 ND<0.10 ND<0.10 2.6 ND<0.10 0.12 ND<1.0 ND<10 S12 5 3 10/1/2015 ND<0.10 ND<0.10 1.1 ND<0.10 ND<0.10 ND<1.0 ND<10 S12 15
3 10/1/2015 ND<0.10 ND<0.10 1.5 0.12 0.10 ND<1.0 ND<10
S13 (see notes) 5 3 10/1/2015 0.49 0.28 15 ND<0.10 0.21 ND<1.0 ND<10 S13 (See notes) 15 3 10/1/2015 ND<0.10 0.34 12 ND<0.10 0.18 ND<1.0 ND<10 S14 5 3 10/2/2015 ND<0.10 ND<0.10 0.16 ND<0.10 ND<0.10 ND<1.0 ND<10 S14 15 3 10/2/2015 ND<0.10 ND<0.10 0.11 ND<0.10 0.11 ND<1.0 ND<10 S15 5 3 10/1/2015 ND<0.10 ND<0.10 1.4 ND<0.10 ND<0.10 ND<1.0 ND<10 S15 15 3 10/1/2015 ND<0.10 ND<0.10 1.0 ND<0.10 ND<0.10 ND<1.0 ND<10 S16A 5 3 10/2/2015 ND<0.10 ND<0.10 3.5 ND<0.10 0.12 ND<1.0 ND<10 S16A 12 3 10/2/2015 ND<0.10 ND<0.10 3.0 0.13 0.22 ND<1.0 ND<10 S17 5 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S17 15 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 0.11 0.11 ND<1.0 ND<10 Ambient Air
TABLE 7

SUMMARY OF VOLATILE ORGANIC COMPOUNDS (VOCS) AND GASOLINE RANGE ORGANICS (GRO) IN SOIL GAS Riverside Scrap Iron & Metal Site
Riverside, California
Results reported in micrograms per liter (µg/L)
Industrial RSLs or DTSC-modified Screeing Level
P:\10468.000.0\10468.004.0\Docs\Additional Phase II ESA Report\Tables\Tables Amec Foster Wheeler

Page 1 of 2 ends

Soil Gas Probe
Designation
Depth
(feet bgs)
Purge
Volume
(µg/L)
Date Chloro-
methane Freon 12 Freon 11 TCE PCE IPA Gasoline Range
Organics
TABLE 7

SUMMARY OF VOLATILE ORGANIC COMPOUNDS (VOCS) AND GASOLINE RANGE ORGANICS (GRO) IN SOIL GAS Riverside Scrap Iron & Metal Site
Riverside, California
Results reported in micrograms per liter (µg/L)
S18 5 3 10/2/2015 ND<0.10UJ ND<0.10U
J 0.62J ND<0.10UJ ND<0.10UJ 3.3J ND<10
S18 15 3 10/2/2015 ND<0.10 ND<0.10 0.50 ND<0.10 ND<0.10 ND<1.0 ND<10 S18 15 Dup 3 10/2/2015 ND<0.10 ND<0.10 0.46 ND<0.10 ND<0.10 ND<1.0 ND<10 S19 5 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 S19 15 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 ES1 5 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 ES1 15 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 ES2 5 3 10/2/2015 ND<0.10 ND<0.10 0.78 ND<0.10 2.0 ND<1.0 ND<10 ES2 15 3 10/2/2015 ND<0.10 ND<0.10 0.69 0.10 1.1 ND<1.0 ND<10 ES3B 5 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 ES3B 5 Dup 3 10/2/2015 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<1.0 ND<10 ES3B 11.25 3 10/2/2015 ND<0.10 ND<0.10 0.19 ND<0.10 ND<0.10 ND<1.0 ND<10 Notes and Data Qualifiers
Volatile Organic Compounds (VOCs) and Gasoline Range Organics (GRO) were analyzed using United States Environmental Protection Agency (EPA) Method 8260M. All remaining VOCs were not detected. For a complete list of EPA 8260M analytes, see laboratory reports.

DTSC, 2011, Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air, October.

P:\10468.000.0\10468.004.0\Docs\Additional Phase II ESA Report\Tables\Tables Amec Foster Wheeler

Page 2 of 2 ends

GSI Job No.: 6239
Former Riverside Scrap Iron & Metal Property Addendum to the Results of Soil Vapor Investigation

APPENDIX B
Analytical Laboratory Reports – Soil Vapor
GSI Environmental, Inc
Irvine, CA 92618
7595 Irvine Center Dr, Ste 250
Samantha Curtis
Enclosed is the analytical report for the above referenced project. The data herein applies to samples as received by H&P Mobile Geochemistry, Inc. on 18-May-23 which were analyzed in accordance with the attached Chain of Custody record(s).

The results for all sample analyses and required QA/QC analyses are presented in the following sections and summarized in the documents:
• Sample Summary
•
Case Narrative (if applicable)
• Sample Results
• Quality Control Summary
• Notes and Definitions / Appendix
• Chain of Custody
• Sampling Logs (if applicable)
Unless otherwise noted, I certify that all analyses were performed and reviewed in compliance with our Quality Systems Manual and Standard Operating Procedures. This report shall not be reproduced, except in full, without the written approval of H&P Mobile Geochemistry, Inc.

We at H&P Mobile Geochemistry, Inc. sincerely appreciate the opportunity to provide analytical services to you on this project. If you have any questions or concerns regarding this analytical report, please contact me at your convenience at 760-804-9678.

Sincerely,
25 May 2023
Lisa Eminhizer
Laboratory Director
H&P Mobile Geochemistry, Inc. is certified under the California ELAP and the National Environmental Laboratory Accreditation Conference (NELAC) for the fields of proficiency and analytes listed on those certificates. H& P is approved as an Environmental Testing Laboratory in accordance with the DoD-ELAP Program and ISO/IEC 17025:2005 programs for the fields of proficiency and analytes included in the certification process and to the extent offered by the accreditation agency . Unless otherwise noted, accreditation certificate numbers, expiration of certificates, and scope of accreditation can be found at: www.handpmg.com/about/certifications. Fields of services and analytes contained in this report that are not listed on the certificates should be considered uncertified or unavailable for certification.

Client Project: 6239 / 2993 6th St
H&P Project: GSI051923-10
Dear Samantha Curtis:

P 1.800.834.9888 / 760.804.9678 F 760.804.9159 W handpmg.com 2470 Impala Drive, Carlsbad, CA 92010 & Field Office - Signal Hill, CA Quality. Accuracy. Experience.

Geochemistry Inc.

Mobile

Page 1 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

GSI Environmental, Inc
7595 Irvine Center Dr, Ste 250
GSI051923-10
6239 / 2993 6th St
Samantha CurtisIrvine, CA
92618 25-May-23 08:23
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.

Sample ID Laboratory ID Matrix Date Sampled

ANALYTICAL REPORT FOR SAMPLES
Date Received
VP-1-15 E305052-01
Vapor 18-May-23 18-May-23
VP-1-30 E305052-02 Vapor 18-May-23 18-May-23
VP-1-30 REP E305052-03 Vapor 18-May-23 18-May-23
VP-1-5 E305052-04 Vapor 18-May-23 18-May-23
VP-9-5 E305052-05 Vapor 18-May-23 18-May-23
VP-9-15 E305052-06 Vapor 18-May-23 18-May-23
VP-9-30 E305052-07 Vapor 18-May-23 18-May-23
VP-11-5 E305052-08 Vapor 18-May-23 18-May-23
VP-11-15 E305052-09 Vapor 18-May-23 18-May-23
VP-19-5 E305052-10 Vapor 18-May-23 18-May-23
VP-19-15 E305052-11 Vapor 18-May-23 18-May-23
VP-19-30 E305052-12 Vapor 18-May-23 18-May-23
VP-12-5 E305052-13 Vapor 18-May-23 18-May-23
VP-12-15 E305052-14 Vapor 18-May-23 18-May-23
VP-12-30 E305052-15 Vapor 18-May-23 18-May-23
VP-20-5 E305052-16 Vapor 18-May-23 18-May-23
VP-20-15 E305052-17 Vapor 18-May-23 18-May-23
VP-20-30 E305052-18 Vapor 18-May-23 18-May-23
VP-14-5 E305052-19 Vapor 18-May-23 18-May-23
VP-14-15 E305052-20 Vapor 18-May-23 18-May-23
VP-14-22 E305052-21 Vapor 18-May-23 18-May-23
VP-16-5 E305052-22 Vapor 18-May-23 18-May-23
VP-16-15 E305052-23 Vapor 18-May-23 18-May-23

Page 2 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

DETECTIONS SUMMARY
Sample ID: Laboratory ID:

Analyte Result Limit
Units Method
E305052-01VP-1-15
Notes
Reporting
Dichlorodifluoromethane (F12) 5.4 5.0 ug/m3 EPA
TO-15
Trichlorofluoromethane (F11) 62 5.6 ug/m3 EPA TO-15
1,1-Dichloroethene 44 4.0 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 280 7.7 ug/m3 EPA TO-15 Trichloroethene 700 5.5 ug/m3 EPA TO-15
Tetrachloroethene 380 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-02VP-1-30
Notes
Reporting
Trichlorofluoromethane (F11) 91 5.6 ug/m3 EPA TO-15
1,1-Dichloroethene 120 4.0 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 390 7.7 ug/m3 EPA TO-15 Chloroform 20 4.9 ug/m3 EPA TO-15
Trichloroethene 1900 5.5 ug/m3 EPA TO-15
Tetrachloroethene 810 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-03VP-1-30 REP
Notes
Reporting
Trichlorofluoromethane (F11) 96 5.6 ug/m3 EPA TO-15
1,1-Dichloroethene 120 4.0 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 410 7.7 ug/m3 EPA TO-15 Chloroform 21 4.9 ug/m3 EPA TO-15
Trichloroethene 2000 5.5 ug/m3 EPA TO-15
Tetrachloroethene 850 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-04VP-1-5
Notes
Reporting
Trichlorofluoromethane (F11) 38 5.6 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 170 7.7 ug/m3 EPA TO-15 Trichloroethene 190 5.5 ug/m3 EPA TO-15
Tetrachloroethene 280 6.9 ug/m3 EPA TO-15

Page 3 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Sample ID: Laboratory ID:

Analyte Result Limit Units
Method
E305052-05VP-9-5
Notes
Reporting
Dichlorodifluoromethane (F12) 29 5.0 ug/m3 EPA
TO-15
Trichlorofluoromethane (F11) 14 5.6 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 51 7.7 ug/m3 EPA TO-15 Carbon disulfide 91 6.3 ug/m3 EPA TO-15
Trichloroethene 6.0 5.5 ug/m3 EPA TO-15
Tetrachloroethene 63 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-06VP-9-15
Notes
Reporting
Trichlorofluoromethane (F11) 48 5.6 ug/m3 EPA TO-15
1,1-Dichloroethene 9.0 4.0 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 210 7.7 ug/m3 EPA TO-15 Trichloroethene 280 5.5 ug/m3 EPA TO-15
Tetrachloroethene 200 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-07VP-9-30
Notes
Reporting
Trichlorofluoromethane (F11) 79 5.6 ug/m3 EPA TO-15
1,1-Dichloroethene 100 4.0 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 350 7.7 ug/m3 EPA TO-15 Chloroform 19 4.9 ug/m3 EPA TO-15
Trichloroethene 1600 5.5 ug/m3 EPA TO-15
Tetrachloroethene 640 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-08VP-11-5
Notes
Reporting
Trichlorofluoromethane (F11) 53 5.6 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 180 7.7 ug/m3 EPA TO-15 Trichloroethene 44 5.5 ug/m3 EPA TO-15
Toluene 3.9 3.8 ug/m3 EPA TO-15
Tetrachloroethene 92 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-09VP-11-15
Notes
Reporting
Trichlorofluoromethane (F11) 78 5.6 ug/m3 EPA TO-15

Page 4 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Sample ID: Laboratory ID:

Analyte Result Limit Units
Method
E305052-09VP-11-15
Notes
Reporting
1,1,2-Trichlorotrifluoroethane (F113) 220 7.7 ug/m3
EPA TO-15
Trichloroethene 650 5.5 ug/m3 EPA TO-15
Tetrachloroethene 380 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-10VP-19-5
Notes
Reporting
Trichlorofluoromethane (F11) 27 5.6 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 45 7.7 ug/m3 EPA TO-15 Carbon disulfide 8.7 6.3 ug/m3 EPA TO-15
Benzene 5.6 3.2 ug/m3 EPA TO-15
Trichloroethene 40 5.5 ug/m3 EPA TO-15
Toluene 7.0 3.8 ug/m3 EPA TO-15
Tetrachloroethene 120 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-11VP-19-15
Notes
Reporting
Trichlorofluoromethane (F11) 58 5.6 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 130 7.7 ug/m3 EPA TO-15 Trichloroethene 290 5.5 ug/m3 EPA TO-15
Tetrachloroethene 320 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-12VP-19-30
Notes
Reporting
Trichlorofluoromethane (F11) 74 5.6 ug/m3 EPA TO-15
1,1-Dichloroethene 27 4.0 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 160 7.7 ug/m3 EPA TO-15 Trichloroethene 1700 5.5 ug/m3 EPA TO-15
Tetrachloroethene 840 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-13VP-12-5
Notes
Reporting
Trichlorofluoromethane (F11) 140 5.6 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 46 7.7 ug/m3 EPA TO-15 Toluene 4.1 3.8 ug/m3 EPA TO-15
Tetrachloroethene 82 6.9 ug/m3 EPA TO-15

Page 5 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Sample ID: Laboratory ID:

Analyte Result Limit Units
Method
E305052-14VP-12-15
Notes
Reporting
Trichlorofluoromethane (F11) 170 5.6 ug/m3 EPA
TO-15
1,1,2-Trichlorotrifluoroethane (F113) 54 7.7 ug/m3 EPA TO-15 Trichloroethene 66 5.5 ug/m3 EPA TO-15
Tetrachloroethene 150 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-15VP-12-30
Notes
Reporting
Trichlorofluoromethane (F11) 240 5.6 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 77 7.7 ug/m3 EPA TO-15 Trichloroethene 300 5.5 ug/m3 EPA TO-15
Tetrachloroethene 270 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-16VP-20-5
Notes
Reporting
Trichlorofluoromethane (F11) 41 5.6 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 17 7.7 ug/m3 EPA TO-15 Trichloroethene 130 5.5 ug/m3 EPA TO-15
Tetrachloroethene 170 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-17VP-20-15
Notes
Reporting
Trichlorofluoromethane (F11) 150 5.6 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 85 7.7 ug/m3 EPA TO-15 Trichloroethene 750 5.5 ug/m3 EPA TO-15
Tetrachloroethene 380 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-18VP-20-30
Notes
Reporting
Trichlorofluoromethane (F11) 250 5.6 ug/m3 EPA TO-15
1,1-Dichloroethene 45 4.0 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 150 7.7 ug/m3 EPA TO-15 Chloroform 24 4.9 ug/m3 EPA TO-15
Trichloroethene 2100 5.5 ug/m3 EPA TO-15
Tetrachloroethene 780 6.9 ug/m3 EPA TO-15

Page 6 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Sample ID: Laboratory ID:

Analyte Result Limit Units
Method
E305052-19VP-14-5
Notes
Reporting
Dichlorodifluoromethane (F12) 8.8 5.0 ug/m3 EPA
TO-15
Trichlorofluoromethane (F11) 410 5.6 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 36 7.7 ug/m3 EPA TO-15 Carbon disulfide 21 6.3 ug/m3 EPA TO-15
Trichloroethene 58 5.5 ug/m3 EPA TO-15
Toluene 3.8 3.8 ug/m3 EPA TO-15
Tetrachloroethene 250 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-20VP-14-15
Notes
Reporting
Dichlorodifluoromethane (F12) 9.1 5.0 ug/m3 EPA TO-15
Trichlorofluoromethane (F11) 470 5.6 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 39 7.7 ug/m3 EPA TO-15 Trichloroethene 160 5.5 ug/m3 EPA TO-15
Tetrachloroethene 350 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-21VP-14-22
Notes
Reporting
Dichlorodifluoromethane (F12) 11 5.0 ug/m3 EPA TO-15
Trichlorofluoromethane (F11) 580 5.6 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 49 7.7 ug/m3 EPA TO-15 Trichloroethene 350 5.5 ug/m3 EPA TO-15
Tetrachloroethene 440 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-22VP-16-5
Notes
Reporting
Trichlorofluoromethane (F11) 23 5.6 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 13 7.7 ug/m3 EPA TO-15 Trichloroethene 18 5.5 ug/m3 EPA TO-15
Tetrachloroethene 150 6.9 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-23VP-16-15
Notes
Reporting
Trichlorofluoromethane (F11) 65 5.6 ug/m3 EPA TO-15
1,1,2-Trichlorotrifluoroethane (F113) 58 7.7 ug/m3 EPA TO-15

Page 7 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E305052-23VP-16-15
Notes
Reporting
Trichloroethene 260 5.5 ug/m3 EPA T
O-15
Tetrachloroethene 320 6.9 ug/m3 EPA TO-15

Page 8 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-1-15 (E305052-01) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 23-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND " " "" "Dichlorodifluor
omethane (F12) "5.05.4
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""Vinyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.662
" " "" "1,1-Dichloroethene "4.044
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.7280
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND
" " "" "Trichloroethene "5.5700
"" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-Trichloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9380
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND

Page 9 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-1-15 (E305052-01) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 23-May-23ug/m3 EE323091o-Xylene 4.4ND "" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-T
rimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "111 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "101 % 78-125Surrogate: Toluene-d8
" " " "88.1 % 77-127Surrogate: 4-Bromofluorobenzene
VP-1-30 (E305052-02) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 23-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""Vinyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.691
" " "" "1,1-Dichloroethene "4.0120
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.7390
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
" " "" "Chloroform "4.920
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND

Page 10 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EP
A TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared
Analyzed Method Notes Factor
VP-1-30 (E305052-02) V
apor Sampled: 18-May-23 Received: 18-May-23
EE32309 23-May-23 23-May-23ug/m3 1Trichloroethene EPA TO-155.51900 "" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-T
richloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9810
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND
"" "" ""o-Xylene 4.4ND
"" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-Trimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "112 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "101 % 78-125Surrogate: Toluene-d8
" " " "88.0 % 77-127Surrogate: 4-Bromofluorobenzene

Page 11 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-1-30 REP (E305052-03) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 23-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""V
inyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.696
" " "" "1,1-Dichloroethene "4.0120
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.7410
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
" " "" "Chloroform "4.921
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND
" " "" "Trichloroethene "5.52000
"" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-Trichloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9850
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND

Page 12 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-1-30 REP (E305052-03) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 23-May-23ug/m3 EE323091o-Xylene 4.4ND "" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-T
rimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "116 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "97.9 % 78-125Surrogate: Toluene-d8
" " " "89.2 % 77-127Surrogate: 4-Bromofluorobenzene
VP-1-5 (E305052-04) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 23-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""Vinyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.638
"" "" ""1,1-Dichloroethene 4.0ND
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.7170
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND

Page 13 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EP
A TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared
Analyzed Method Notes Factor
VP-1-5 (E305052-04) V
apor Sampled: 18-May-23 Received: 18-May-23
EE32309 23-May-23 23-May-23ug/m3 1Trichloroethene EPA TO-155.5190 "" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-T
richloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9280
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND
"" "" ""o-Xylene 4.4ND
"" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-Trimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "113 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "101 % 78-125Surrogate: Toluene-d8
" " " "86.7 % 77-127Surrogate: 4-Bromofluorobenzene

Page 14 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-9-5 (E305052-05) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 23-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND " " "" "Dichlorodifluor
omethane (F12) "5.029
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""Vinyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.614
"" "" ""1,1-Dichloroethene 4.0ND
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.751
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
" " "" "Carbon disulfide "6.391
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND
" " "" "Trichloroethene "5.56.0
"" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-Trichloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.963
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND

Page 15 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-9-5 (E305052-05) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 23-May-23ug/m3 EE323091o-Xylene 4.4ND "" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-T
rimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "112 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "99.8 % 78-125Surrogate: Toluene-d8
" " " "88.0 % 77-127Surrogate: 4-Bromofluorobenzene
VP-9-15 (E305052-06) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 23-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""Vinyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.648
" " "" "1,1-Dichloroethene "4.09.0
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.7210
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND

Page 16 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EP
A TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared
Analyzed Method Notes Factor
VP-9-15 (E305052-06) V
apor Sampled: 18-May-23 Received: 18-May-23
EE32309 23-May-23 23-May-23ug/m3 1Trichloroethene EPA TO-155.5280 "" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-T
richloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9200
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND
"" "" ""o-Xylene 4.4ND
"" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-Trimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "113 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "100 % 78-125Surrogate: Toluene-d8
" " " "88.4 % 77-127Surrogate: 4-Bromofluorobenzene

Page 17 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-9-30 (E305052-07) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 23-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""V
inyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.679
" " "" "1,1-Dichloroethene "4.0100
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.7350
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
" " "" "Chloroform "4.919
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND
" " "" "Trichloroethene "5.51600
"" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-Trichloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9640
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND

Page 18 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-9-30 (E305052-07) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 23-May-23ug/m3 EE323091o-Xylene 4.4ND "" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-T
rimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "113 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "99.5 % 78-125Surrogate: Toluene-d8
" " " "86.3 % 77-127Surrogate: 4-Bromofluorobenzene
VP-11-5 (E305052-08) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 23-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""Vinyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.653
"" "" ""1,1-Dichloroethene 4.0ND
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.7180
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND

Page 19 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EP
A TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared
Analyzed Method Notes Factor
VP-11-5 (E305052-08)
Vapor Sampled: 18-May-23 Received: 18-May-23
EE32309 23-May-23 23-May-23ug/m3 1Trichloroethene EPA TO-155.544 "" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
" " "" "Toluene "3.83.9
"" "" ""1,1,2-T
richloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.992
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND
"" "" ""o-Xylene 4.4ND
"" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-Trimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "115 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "102 % 78-125Surrogate: Toluene-d8
" " " "86.3 % 77-127Surrogate: 4-Bromofluorobenzene

Page 20 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-11-15 (E305052-09) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 23-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""V
inyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.678
"" "" ""1,1-Dichloroethene 4.0ND
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.7220
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND
" " "" "Trichloroethene "5.5650
"" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-Trichloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9380
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND

Page 21 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-11-15 (E305052-09) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 23-May-23ug/m3 EE323091o-Xylene 4.4ND "" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-T
rimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "115 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "98.8 % 78-125Surrogate: Toluene-d8
" " " "85.2 % 77-127Surrogate: 4-Bromofluorobenzene
VP-19-5 (E305052-10) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 23-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""Vinyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.627
"" "" ""1,1-Dichloroethene 4.0ND
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.745
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
" " "" "Carbon disulfide "6.38.7
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
" " "" "Benzene "3.25.6
"" "" ""Carbon tetrachloride 6.4ND

Page 22 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EP
A TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared
Analyzed Method Notes Factor
VP-19-5 (E305052-10) V
apor Sampled: 18-May-23 Received: 18-May-23
EE32309 23-May-23 23-May-23ug/m3 1Trichloroethene EPA TO-155.540 "" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
" " "" "Toluene "3.87.0
"" "" ""1,1,2-T
richloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9120
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND
"" "" ""o-Xylene 4.4ND
"" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-Trimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "114 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "101 % 78-125Surrogate: Toluene-d8
" " " "85.6 % 77-127Surrogate: 4-Bromofluorobenzene

Page 23 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-19-15 (E305052-11) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 23-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""V
inyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.658
"" "" ""1,1-Dichloroethene 4.0ND
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.7130
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND
" " "" "Trichloroethene "5.5290
"" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-Trichloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9320
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND

Page 24 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-19-15 (E305052-11) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 23-May-23ug/m3 EE323091o-Xylene 4.4ND "" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-T
rimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "117 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "99.5 % 78-125Surrogate: Toluene-d8
" " " "84.6 % 77-127Surrogate: 4-Bromofluorobenzene
VP-19-30 (E305052-12) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""Vinyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.674
" " "" "1,1-Dichloroethene "4.027
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.7160
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND

Page 25 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EP
A TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared
Analyzed Method Notes Factor
VP-19-30 (E305052-12) V
apor Sampled: 18-May-23 Received: 18-May-23
EE32309 23-May-23 24-May-23ug/m3 1Trichloroethene EPA TO-155.51700 "" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-T
richloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9840
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND
"" "" ""o-Xylene 4.4ND
"" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-Trimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "113 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "102 % 78-125Surrogate: Toluene-d8
" " " "86.2 % 77-127Surrogate: 4-Bromofluorobenzene

Page 26 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-12-5 (E305052-13) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""V
inyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.6140
"" "" ""1,1-Dichloroethene 4.0ND
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.746
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND
"" "" ""Trichloroethene 5.5ND
"" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
" " "" "Toluene "3.84.1
"" "" ""1,1,2-Trichloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.982
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND

Page 27 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-12-5 (E305052-13) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE323091o-Xylene 4.4ND "" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-T
rimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "117 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "99.7 % 78-125Surrogate: Toluene-d8
" " " "88.6 % 77-127Surrogate: 4-Bromofluorobenzene
VP-12-15 (E305052-14) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""Vinyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.6170
"" "" ""1,1-Dichloroethene 4.0ND
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.754
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND

Page 28 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EP
A TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared
Analyzed Method Notes Factor
VP-12-15 (E305052-14) V
apor Sampled: 18-May-23 Received: 18-May-23
EE32309 23-May-23 24-May-23ug/m3 1Trichloroethene EPA TO-155.566 "" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-T
richloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9150
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND
"" "" ""o-Xylene 4.4ND
"" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-Trimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "113 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "101 % 78-125Surrogate: Toluene-d8
" " " "88.6 % 77-127Surrogate: 4-Bromofluorobenzene

Page 29 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-12-30 (E305052-15) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""V
inyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.6240
"" "" ""1,1-Dichloroethene 4.0ND
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.777
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND
" " "" "Trichloroethene "5.5300
"" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-Trichloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9270
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND

Page 30 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-12-30 (E305052-15) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE323091o-Xylene 4.4ND "" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-T
rimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "112 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "100 % 78-125Surrogate: Toluene-d8
" " " "90.8 % 77-127Surrogate: 4-Bromofluorobenzene
VP-20-5 (E305052-16) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""Vinyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.641
"" "" ""1,1-Dichloroethene 4.0ND
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.717
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND

Page 31 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EP
A TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared
Analyzed Method Notes Factor
VP-20-5 (E305052-16) V
apor Sampled: 18-May-23 Received: 18-May-23
EE32309 23-May-23 24-May-23ug/m3 1Trichloroethene EPA TO-155.5130 "" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-T
richloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9170
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND
"" "" ""o-Xylene 4.4ND
"" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-Trimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "112 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "100 % 78-125Surrogate: Toluene-d8
" " " "89.1 % 77-127Surrogate: 4-Bromofluorobenzene

Page 32 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-20-15 (E305052-17) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""V
inyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.6150
"" "" ""1,1-Dichloroethene 4.0ND
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.785
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND
" " "" "Trichloroethene "5.5750
"" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-Trichloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9380
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND

Page 33 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-20-15 (E305052-17) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE323091o-Xylene 4.4ND "" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-T
rimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "112 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "101 % 78-125Surrogate: Toluene-d8
" " " "86.2 % 77-127Surrogate: 4-Bromofluorobenzene
VP-20-30 (E305052-18) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""Vinyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.6250
" " "" "1,1-Dichloroethene "4.045
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.7150
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
" " "" "Chloroform "4.924
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND

Page 34 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EP
A TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared
Analyzed Method Notes Factor
VP-20-30 (E305052-18) V
apor Sampled: 18-May-23 Received: 18-May-23
EE32309 23-May-23 24-May-23ug/m3 1Trichloroethene EPA TO-155.52100 "" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-T
richloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9780
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND
"" "" ""o-Xylene 4.4ND
"" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-Trimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "114 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "101 % 78-125Surrogate: Toluene-d8
" " " "88.7 % 77-127Surrogate: 4-Bromofluorobenzene

Page 35 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-14-5 (E305052-19) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND " " "" "Dichlorodifluor
omethane (F12) "5.08.8
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""Vinyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.6410
"" "" ""1,1-Dichloroethene 4.0ND
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.736
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
" " "" "Carbon disulfide "6.321
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND
" " "" "Trichloroethene "5.558
"" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
" " "" "Toluene "3.83.8
"" "" ""1,1,2-Trichloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9250
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND

Page 36 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-14-5 (E305052-19) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE323091o-Xylene 4.4ND "" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-T
rimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "109 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "102 % 78-125Surrogate: Toluene-d8
" " " "92.1 % 77-127Surrogate: 4-Bromofluorobenzene
VP-14-15 (E305052-20) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND " " "" "Dichlorodifluoromethane (F12) "5.09.1
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""Vinyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.6470
"" "" ""1,1-Dichloroethene 4.0ND
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.739
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND

Page 37 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EP
A TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared
Analyzed Method Notes Factor
VP-14-15 (E305052-20) V
apor Sampled: 18-May-23 Received: 18-May-23
EE32309 23-May-23 24-May-23ug/m3 1Trichloroethene EPA TO-155.5160 "" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-T
richloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9350
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND
"" "" ""o-Xylene 4.4ND
"" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-Trimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "114 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "101 % 78-125Surrogate: Toluene-d8
" " " "88.9 % 77-127Surrogate: 4-Bromofluorobenzene

Page 38 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-14-22 (E305052-21) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND " " "" "Dichlorodifluor
omethane (F12) "5.011
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""Vinyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.6580
"" "" ""1,1-Dichloroethene 4.0ND
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.749
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND
" " "" "Trichloroethene "5.5350
"" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-Trichloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9440
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND

Page 39 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-14-22 (E305052-21) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE323091o-Xylene 4.4ND "" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-T
rimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "117 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "105 % 78-125Surrogate: Toluene-d8
" " " "89.9 % 77-127Surrogate: 4-Bromofluorobenzene
VP-16-5 (E305052-22) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""Vinyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.623
"" "" ""1,1-Dichloroethene 4.0ND
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.713
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND

Page 40 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EP
A TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared
Analyzed Method Notes Factor
VP-16-5 (E305052-22) V
apor Sampled: 18-May-23 Received: 18-May-23
EE32309 23-May-23 24-May-23ug/m3 1Trichloroethene EPA TO-155.518 "" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-T
richloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9150
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND
"" "" ""o-Xylene 4.4ND
"" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-Trimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "108 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "101 % 78-125Surrogate: Toluene-d8
" " " "88.6 % 77-127Surrogate: 4-Bromofluorobenzene

Page 41 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-16-15 (E305052-23) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE3230911,1-Difluoroethane (LCC) 5.5ND "" "" ""Dichlorodifluoromethane (F12) 5.0ND
"" "" ""Chloromethane 2.1ND
"" "" ""Dichlorotetrafluoroethane (F114) 7.1ND
"" "" ""V
inyl chloride 2.6ND
"" "" ""Bromomethane 16ND
"" "" ""Chloroethane 8.0ND
" " "" "Trichlorofluoromethane (F11) "5.665
"" "" ""1,1-Dichloroethene 4.0ND
" " "" "1,1,2-Trichlorotrifluoroethane (F113) "7.758
"" "" ""Methylene chloride (Dichloromethane) 3.5ND
"" "" ""Carbon disulfide 6.3ND
"" "" ""trans-1,2-Dichloroethene 8.0ND
"" "" ""1,1-Dichloroethane 4.1ND
"" "" ""2-Butanone (MEK) 30ND
"" "" ""cis-1,2-Dichloroethene 4.0ND
"" "" ""Chloroform 4.9ND
"" "" ""1,1,1-Trichloroethane 5.5ND
"" "" ""1,2-Dichloroethane (EDC) 4.1ND
"" "" ""Benzene 3.2ND
"" "" ""Carbon tetrachloride 6.4ND
" " "" "Trichloroethene "5.5260
"" "" ""1,2-Dichloropropane 9.4ND
"" "" ""Bromodichloromethane 6.8ND
"" "" ""cis-1,3-Dichloropropene 4.6ND
"" "" ""4-Methyl-2-pentanone (MIBK) 8.3ND
"" "" ""trans-1,3-Dichloropropene 4.6ND
"" "" ""Toluene 3.8ND
"" "" ""1,1,2-Trichloroethane 5.5ND
"" "" ""2-Hexanone (MBK) 8.3ND
"" "" ""Dibromochloromethane 8.6ND
" " "" "Tetrachloroethene "6.9320
"" "" ""1,2-Dibromoethane (EDB) 7.8ND
"" "" ""1,1,1,2-Tetrachloroethane 7.0ND
"" "" ""Chlorobenzene 4.7ND
"" "" ""Ethylbenzene 4.4ND
"" "" ""m,p-Xylene 8.8ND
"" "" ""Styrene 4.3ND

Page 42 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Volatile Organic Compounds by EPA TO-15
H&P Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-16-15 (E305052-23) Vapor Sampled: 18-May-23 Received: 18-May-23 EPA TO-1523-May-23 24-May-23ug/m3 EE323091o-Xylene 4.4ND "" "" ""Bromoform 10ND
"" "" ""1,1,2,2-Tetrachloroethane 7.0ND
"" "" ""4-Ethyltoluene 5.0ND
"" "" ""1,3,5-T
rimethylbenzene 5.0ND
"" "" ""1,2,4-Trimethylbenzene 5.0ND
"" "" ""1,3-Dichlorobenzene 12ND
"" "" ""1,4-Dichlorobenzene 12ND
"" "" ""1,2-Dichlorobenzene 12ND
"" "" ""1,2,4-Trichlorobenzene 38ND
"" "" ""Hexachlorobutadiene 54ND
" " " "112 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "103 % 78-125Surrogate: Toluene-d8
" " " "87.6 % 77-127Surrogate: 4-Bromofluorobenzene

Page 43 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Limit Notes Analyte
Volatile Organic Compounds by EPA TO-15 - Quality Control H&P
Mobile Geochemistry, Inc.

Batch EE32309 - TO-15
Blank (EE32309-BLK1) Prepared & Analyzed: 23-May-23
1,1-Difluoroethane (LCC) ug/m35.5ND
Dichlorodifluoromethane (F12) "5.0ND
Chloromethane "2.1ND
Dichlorotetrafluoroethane (F114) "7.1ND
Vinyl chloride "2.6ND
Bromomethane "16ND
Chloroethane "8.0ND
Trichlorofluoromethane (F11) "5.6ND
1,1-Dichloroethene "4.0ND
1,1,2-Trichlorotrifluoroethane (F113) "7.7ND
Methylene chloride (Dichloromethane) "3.5ND
Carbon disulfide "6.3ND
trans-1,2-Dichloroethene "8.0ND
1,1-Dichloroethane "4.1ND
2-Butanone (MEK) "30ND
cis-1,2-Dichloroethene "4.0ND
Chloroform "4.9ND
1,1,1-Trichloroethane "5.5ND
1,2-Dichloroethane (EDC) "4.1ND
Benzene "3.2ND
Carbon tetrachloride "6.4ND
Trichloroethene "5.5ND
1,2-Dichloropropane "9.4ND
Bromodichloromethane "6.8ND
cis-1,3-Dichloropropene "4.6ND
4-Methyl-2-pentanone (MIBK) "8.3ND
trans-1,3-Dichloropropene "4.6ND
Toluene "3.8ND
1,1,2-Trichloroethane "5.5ND
2-Hexanone (MBK) "8.3ND
Dibromochloromethane "8.6ND
Tetrachloroethene "6.9ND
1,2-Dibromoethane (EDB) "7.8ND
1,1,1,2-Tetrachloroethane "7.0ND

Page 44 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Limit Notes Analyte
Volatile Organic Compounds by EPA TO-15 - Quality Control H&P
Mobile Geochemistry, Inc.

Batch EE32309 - TO-15
Blank (EE32309-BLK1) Prepared & Analyzed: 23-May-23
Chlorobenzene ug/m34.7ND
Ethylbenzene "4.4ND
m,p-Xylene "8.8ND
Styrene "4.3ND
o-Xylene "4.4ND
Bromoform "10ND
1,1,2,2-Tetrachloroethane "7.0ND
4-Ethyltoluene "5.0ND
1,3,5-Trimethylbenzene "5.0ND
1,2,4-Trimethylbenzene "5.0ND
1,3-Dichlorobenzene "12ND
1,4-Dichlorobenzene "12ND
1,2-Dichlorobenzene "12ND
1,2,4-Trichlorobenzene "38ND
Hexachlorobutadiene "54ND
" 214 76-134Surrogate: 1,2-Dichloroethane-d4 109232
" 208 78-125Surrogate: Toluene-d8 103215
" 363 77-127Surrogate: 4-Bromofluorobenzene 88.0319
Blank (EE32309-BLK2) Prepared: 23-May-23 Analyzed: 24-May-23 1,1-Difluoroethane (LCC) ug/m35.5ND
Dichlorodifluoromethane (F12) "5.0ND
Chloromethane "2.1ND
Dichlorotetrafluoroethane (F114) "7.1ND
Vinyl chloride "2.6ND
Bromomethane "16ND
Chloroethane "8.0ND
Trichlorofluoromethane (F11) "5.6ND
1,1-Dichloroethene "4.0ND
1,1,2-Trichlorotrifluoroethane (F113) "7.7ND
Methylene chloride (Dichloromethane) "3.5ND
Carbon disulfide "6.3ND
trans-1,2-Dichloroethene "8.0ND

Page 45 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Limit Notes Analyte
Volatile Organic Compounds by EPA TO-15 - Quality Control H&P
Mobile Geochemistry, Inc.

Batch EE32309 - TO-15
Blank (EE32309-BLK2) Prepared: 23-May-23 Analyzed: 24-May-23 1,1-Dichloroethane ug/m34.1ND
2-Butanone (MEK) "30ND
cis-1,2-Dichloroethene "4.0ND
Chloroform "4.9ND
1,1,1-Trichloroethane "5.5ND
1,2-Dichloroethane (EDC) "4.1ND
Benzene "3.2ND
Carbon tetrachloride "6.4ND
Trichloroethene "5.5ND
1,2-Dichloropropane "9.4ND
Bromodichloromethane "6.8ND
cis-1,3-Dichloropropene "4.6ND
4-Methyl-2-pentanone (MIBK) "8.3ND
trans-1,3-Dichloropropene "4.6ND
Toluene "3.8ND
1,1,2-Trichloroethane "5.5ND
2-Hexanone (MBK) "8.3ND
Dibromochloromethane "8.6ND
Tetrachloroethene "6.9ND
1,2-Dibromoethane (EDB) "7.8ND
1,1,1,2-Tetrachloroethane "7.0ND
Chlorobenzene "4.7ND
Ethylbenzene "4.4ND
m,p-Xylene "8.8ND
Styrene "4.3ND
o-Xylene "4.4ND
Bromoform "10ND
1,1,2,2-Tetrachloroethane "7.0ND
4-Ethyltoluene "5.0ND
1,3,5-Trimethylbenzene "5.0ND
1,2,4-Trimethylbenzene "5.0ND
1,3-Dichlorobenzene "12ND
1,4-Dichlorobenzene "12ND
1,2-Dichlorobenzene "12ND

Page 46 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits
RPD
RPD
Limit Notes Analyte
Volatile Organic Compounds by EPA TO-15 - Quality Control H&P
Mobile Geochemistry, Inc.

Batch EE32309 - TO-15
Blank (EE32309-BLK2) Prepared: 23-May-23 Analyzed: 24-May-23 1,2,4-Trichlorobenzene ug/m338ND
Hexachlorobutadiene "54ND
" 214 76-134Surrogate: 1,2-Dichloroethane-d4 110235
" 208 78-125Surrogate: Toluene-d8 100208
" 363 77-127Surrogate: 4-Bromofluorobenzene 86.6314
LCS (EE32309-BS1) Prepared: 23-May-23 Analyzed: 24-May-23 Dichlorodifluoromethane (F12) ug/m3 101 59-1281135.0110 Vinyl chloride " 52.0 64-1271172.661
Chloroethane " 53.6 63-1271048.056
Trichlorofluoromethane (F11) " 113 QL-1H62-1261275.6140 1,1-Dichloroethene " 80.8 61-1331034.083
1,1,2-Trichlorotrifluoroethane (F113) " 155 66-1261027.7160 Methylene chloride (Dichloromethane) " 70.8 62-11599.43.570 trans-1,2-Dichloroethene " 80.8 67-12495.78.077
1,1-Dichloroethane " 82.4 68-12698.94.182
cis-1,2-Dichloroethene " 80.0 70-12196.74.077
Chloroform " 99.2 68-1231054.9100
1,1,1-Trichloroethane " 111 68-12599.35.5110
1,2-Dichloroethane (EDC) " 82.4 65-1281144.194
Benzene " 64.8 69-11989.73.258
Carbon tetrachloride " 128 68-13295.26.4120
Trichloroethene " 110 71-1231055.5120
Toluene " 76.8 66-11991.93.871
1,1,2-Trichloroethane " 111 73-11998.15.5110
Tetrachloroethene " 138 66-12491.66.9130
1,1,1,2-Tetrachloroethane " 140 67-12982.37.0120
Ethylbenzene " 88.4 70-12480.34.471
m,p-Xylene " 88.4 61-13480.98.872
o-Xylene " 88.4 67-12580.34.471
1,1,2,2-Tetrachloroethane " 140 65-12783.17.0120
" 214 76-134Surrogate: 1,2-Dichloroethane-d4 116247

Page 47 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Limit Notes Analyte
Volatile Organic Compounds by EPA TO-15 - Quality Control H&P
Mobile Geochemistry, Inc.

Batch EE32309 - TO-15
LCS (EE32309-BS1) Prepared: 23-May-23 Analyzed: 24-May-23 ug/m3 208 78-125Surrogate: Toluene-d8 102211
" 363 77-127Surrogate: 4-Bromofluorobenzene 92.8337
LCS (EE32309-BS2) Prepared: 23-May-23 Analyzed: 24-May-23 Dichlorodifluoromethane (F12) ug/m3 101 QL-1H59-1281285.0130 Vinyl chloride " 52.0 QL-1H64-1271302.668
Chloroethane " 53.6 63-1271118.059
Trichlorofluoromethane (F11) " 113 QL-1H62-1261475.6170 1,1-Dichloroethene " 80.8 61-1331144.092
1,1,2-Trichlorotrifluoroethane (F113) " 155 66-1261107.7170 Methylene chloride (Dichloromethane) " 70.8 62-1151153.581 trans-1,2-Dichloroethene " 80.8 67-1241018.082
1,1-Dichloroethane " 82.4 68-1261034.185
cis-1,2-Dichloroethene " 80.0 70-1211004.080
Chloroform " 99.2 68-1231124.9110
1,1,1-Trichloroethane " 111 68-1251095.5120
1,2-Dichloroethane (EDC) " 82.4 65-1281214.1100
Benzene " 64.8 69-11993.43.261
Carbon tetrachloride " 128 68-1321046.4130
Trichloroethene " 110 71-1231075.5120
Toluene " 76.8 66-11996.73.874
1,1,2-Trichloroethane " 111 73-1191045.5120
Tetrachloroethene " 138 66-12496.76.9130
1,1,1,2-Tetrachloroethane " 140 67-12984.37.0120
Ethylbenzene " 88.4 70-12480.34.471
m,p-Xylene " 88.4 61-13482.18.873
o-Xylene " 88.4 67-12581.84.472
1,1,2,2-Tetrachloroethane " 140 65-12784.07.0120
" 214 76-134Surrogate: 1,2-Dichloroethane-d4 122260
" 208 78-125Surrogate: Toluene-d8 107222
" 363 77-127Surrogate: 4-Bromofluorobenzene 91.7333

Page 48 of 49 ends

Project:

Project Number:

Project Manager:

Reported:

Notes and Definitions
QL-1H The LCS and/or LCSD recoveries fell above the established control specifications for this analyte. Any result for this compound is qualified and should be considered biased high.

Percent Recovery
Relative Percent DifferenceRPD
%REC
Method Detection LimitMDL
Analyte NOT DETECTED at or above the reporting limitND
Leak Check CompoundLCC
Appendix
H&P Mobile Geochemistry, Inc. is approved as an Environmental T esting Laboratory and Mobile Laboratory in accordance with the DoD -ELAP Program and ISO/IEC 17025:2005 programs through PJLA, accreditation number 69070 for EPA Method TO-15 and H&P 8260SV.

H&P is approved by the State of California as an Environmental Laboratory and Mobile Laboratory in conformance with the Environmental Laboratory Accreditation Program (ELAP) for the category of V olatile and Semi-V olatile Organic Chemistry of Hazardous Waste, certification number 2741.

H&P is approved by the State of Louisiana Department of Environmental Quality under the National Environmental Laboratory Accreditation Conference (NELAC) certification number 04138
The complete list of stationary and mobile laboratory certifications along with the fields of testing (FOTs) and analyte lists are available at www.handpmg.com/about/certifications.

All soil results are reported in wet weight.

Page 49 of 49 ends

Riverside City CouncilJuly 14, 2026

Riverside City Council
July 14, 2026