DERR-2025-000566

Cover Page
Vapor Study Report—December 2024
Brent Redd Property
148 East Center Street Monticello, Utah
Facility ID #5000003 Release ID GZQ
January 16, 2025 | Terracon Project No. AL067003
Prepared for:
Utah Department of Environmental Quality
Division of Environmental Response and Remediation
Salt Lake City, Utah
6952 South High Tech Drive, Ste. B
Midvale, Utah 84057
P [phone]
Terracon.com
Facilities |Environmental | Geotechnical | Materials i
Cover Letter
January 16, 2025
Utah Department of Environmental Quality
Division of Environmental Response and Remediation
195 North 1950 West
Salt Lake City, Utah 84114
Attn: Mr. Mark Crim
E:[e-mail]
Re:Vapor Study Report—December 2024
Brent Redd Facility
148 East Center Street, Monticello, Utah
Facility Identification No. 5000003, Release ID GZQ
Terracon Project No. AL067003
Dear Mr. Crim:
Terracon Consultants, Inc. (Terracon) is pleased to submit this Vapor Study Report
documenting the third indoor air, outdoor air, and sub-slab vapor sampling event conducted
under Work Assignment GZQ-59-TER at the Brent Redd facility (Facility ID 5000003, Release
ID GZQ), located at 148 East Center Street, Monticello, Utah.
Terracon has performed this work pursuant to Terracon’s Work Plan GZQ-58-TER, dated
March 18, 2024 under Terracon's contract (Contract Number 216383) with the Division of
Environmental Response and Remediation (DERR).
We appreciate the opportunity to have performed these services for you. Please contact our
office at [phone] if you have questions regarding this information or if we can
provide any other services.
Sincerely,
Terracon Consultants, Inc.
JR Murphy Craig D. Eaton
Field Scientist Authorized Project Reviewer
UST Sampler #1947 UST Consultant #CC167
Facilities |Environmental | Geotechnical | Materials ii
Table of Contents
1.0 Introduction ................................................................................ 1
1.1 Site Description ..................................................................................... 1
1.2 Project Background ................................................................................ 1
1.3 Standard of Care .................................................................................... 1
1.4 Additional Scope Limitations .................................................................... 2
1.5 Reliance ................................................................................................ 2
2.0 Field Methods .............................................................................. 2
2.1 Indoor Air Sampling Event ....................................................................... 3
2.2 Outdoor Air Sampling Event..................................................................... 3
2.3 Sub-Slab Vapor Sampling ........................................................................ 3
2.4 Laboratory Analyses ............................................................................... 4
3.0 Results ....................................................................................... 4
3.1 Indoor Air Samples ................................................................................. 4
3.2 Outdoor Air Sample ................................................................................ 5
3.3 Sub Slab Gas Samples ............................................................................ 5
4.0 Summary and Conclusions ............................................................ 6
APPENDICES
Appendix A Exhibit 1 Topographic Site Overview
Exhibit 2 Vapor Sample Location Map, December 2024
Appendix B Table 1 VOCs in Indoor Air, Outdoor Air, and Soil Gas
Appendix C Chain of Custody Documentation and Laboratory Report
Vapor Study Report—December 2024 (Third Event)
Brent Redd Property | Monticello, Utah
January 16, 2025 | Terracon Project No. AL067003
Facilities |Environmental | Geotechnical | Materials 1
1.0 Introduction
1.1 Site Description
Terracon conducted a vapor study event at the Brent Redd facility (Facility ID 5000003,
Release ID GZQ, “site”), located at 148 East Center Street, Monticello, Utah. A topographic
map of the area is provided as Exhibit 1 (Appendix A). The site is currently operated as the
S&S Fusion equipment maintenance shop, which services equipment used to fuse poly pipe.
A site diagram with vapor sample locations and the most recent benzene-impacted
groundwater plume location is provided as Exhibit 2 (Appendix A).
1.2 Project Background
A release of petroleum hydrocarbons from underground storage tanks has been documented
at the site. In an effort to better evaluate impacts to potential receptors, the DERR
requested a study to assess concentrations of volatile organic compounds (VOCs) in indoor
air, outdoor air, and soil gas at the site and at the eastern-adjoining Monticello Inn, which
overlays a portion of the dissolved-phase petroleum plume migrating off site.
The objective of this investigation was to evaluate the potential presence of VOCs in indoor
air, outdoor air, and sub-slab soil gas above relevant regulatory screening levels that could
be associated with the dissolved-phase petroleum plume identified on the site.
Quarterly groundwater monitoring has been conducted concurrently at this site under Work
Assignment GZQ-57-TER.
1.3 Standard of Care
Terracon’s services were performed consistent with generally accepted practices of the
profession undertaken in similar studies in the same geographical area during the same
time period. Please note that Terracon does not warrant the work of laboratories, regulatory
agencies, or other third parties supplying information used to prepare this report. These
services were performed in accordance with the scope of services agreed with you, our
client, as reflected in our Work Plan, and were not conducted in accordance with ASTM
E1903-19.
Vapor Study Report – December 2024 (Third Event)
Brent Redd Property | Monticello, Utah
January 16, 2025 | Terracon Project No. AL067003
Facilities |Environmental | Geotechnical | Materials 2
1.4 Additional Scope Limitations
Findings, conclusions, and recommendations resulting from these services are based upon
information derived from the on-site activities and other services performed under this
scope of services. Such information is subject to change over time. Certain indicators of the
presence of hazardous substances, petroleum products, or other constituents may have
been latent, inaccessible, unobservable, non-detectable, or not present during these
services. We cannot represent that the site contains no hazardous substances, toxic
materials, petroleum products, or other latent conditions beyond those identified during this
sampling event. Subsurface conditions may vary from those encountered at specific sample
locations or during other surveys, tests, assessments, investigations, or exploratory
services. The data, interpretations, findings, and our recommendations are based solely
upon data obtained at the time and within the scope of these services.
1.5 Reliance
This report has been prepared for the exclusive use and reliance of the Utah Department of
Environmental Quality (UDEQ). Use or reliance by any other party is prohibited without the
written authorization of the UDEQ and Terracon.
Reliance on the report by the client and all authorized parties will be subject to the terms,
conditions, and limitations stated in the proposal, report, and Terracon’s Terms and
Conditions. The limitation of liability defined in the Terms and Conditions is the aggregate
limit of Terracon’s liability to the client and all relying parties.
2.0 Field Methods
Sampling was conducted on December 10 and 11, 2024, to assess concentrations of VOCs
in indoor air, outdoor air, and soil gas. Samples were collected from four indoor air locations
(IA-1, IA-2, IA-4, and IA-5) inside the Monticello Inn or crawlspace, one outdoor air location
(OA-1) adjacent to the office of the Monticello Inn, and two sub-slab soil vapor pins (VP-1
and VP-2), within the basement of the Monticello Inn and the office within the site building,
respectively. Indoor air sample IA-3 was proposed to be located in a motel room that was
occupied at the time of this sampling event and was not accessible for sampling. The
sampling locations are depicted on Exhibit 2 (Appendix A).
Prior to the sampling activities, Terracon inspected the sample areas for potential sources of
VOCs. No significant sources of VOCs were identified within the Monticello Inn or office of
the S&S Fusion equipment maintenance shop (site building); however, the potential exists
that VOCs could exist in the area of the outdoor sample (OA-1) due to the proximity of
vehicles within Center Street or that may be idling at the Monticello Inn.
Vapor Study Report – December 2024 (Third Event)
Brent Redd Property | Monticello, Utah
January 16, 2025 | Terracon Project No. AL067003
Facilities |Environmental | Geotechnical | Materials 3
2.1 Indoor Air Sampling Event
On December 10, 2024, four Summa™ canisters were placed at the Monticello Inn. Two
canisters were placed within rooms of the ground-level floor of the inn, including IA-1,
which was placed in the office space; and IA-2, which was placed in Room 101. IA-3 has
previously been sampled from Room 102; however, the room was occupied during this
sampling event and not accessible for sampling activities. Two canisters were placed in the
crawlspace beneath the inn (IA-4 and IA-5). The canisters were placed in the selected
locations with the sample inlets within a typical breathing zone height, approximately 3 to 5
feet above the floor.
Each sample was collected over a 24-hour period using a flow-control device affixed to a
batch-certified, 6-liter capacity, Summa™ stainless steel canister supplied by H&P Mobile
Geochemistry, Inc. (H&P), located in Carlsbad, California.
2.2 Outdoor Air Sampling Event
One Summa™ canister was placed outside, adjacent to the office of the Monticello Inn on
December 10, 2024. The canister was placed on the lawn with the sample inlet within a
typical breathing zone height at approximately 4 feet above the ground surface.
The sample was collected over a 24-hour period using a flow-control device affixed to a
batch-certified, 6-liter capacity, Summa™ stainless steel canister supplied by H&P.
2.3 Sub-Slab Vapor Sampling
The vapor pins that were installed in November 2023 in the basement utility room of the
Monticello Inn (VP-1) and in the slab-on-grade office area of the former Brent Redd service
station (VP-2) were sampled on December 10, 2024.
The Vapor PinTM assembly consisted of a permanent flush-mount brass barb fitting with a
silicone sleeve to seal the sample hole.
Terracon conducted leak detection tests at each location prior to sample collection. The first
test was conducted to evaluate the sample train for leaks using a shut-in test on the sample
train after it was fully assembled. The shut-in test was conducted by closing the valve to the
vapor pin and applying a vacuum to the closed sample train while monitoring the pressure
on an inline vacuum gauge for one minute. If the sample train held a constant vacuum
pressure, the sample train was deemed to be airtight. Following the shut-in test, the air that
was evacuated from the sample train during the test was purged.
A second leak detection test was conducted by introducing helium gas at approximately 15
to 20 percent into a sampling shroud placed over the vapor pin. If a helium concentration
Vapor Study Report – December 2024 (Third Event)
Brent Redd Property | Monticello, Utah
January 16, 2025 | Terracon Project No. AL067003
Facilities |Environmental | Geotechnical | Materials 4
greater than 7,500 parts per million (ppm) was measured, it was considered as a potential
leak in the sampling train, and the sample train connections were re-examined and
tightened, where necessary, then re-tested. Three passing helium tests were conducted at
each location prior to sampling.
Each sub-slab sample was collected over a 5-minute period using a batch-certified, 1-liter
capacity, Summa™ stainless steel canister supplied by H&P.
2.4 Laboratory Analyses
The indoor air, outdoor air, and sub-slab vapor samples were submitted to H&P under
standard chain-of-custody protocol for analysis of VOCs using United states Environmental
Protection Agency (EPA) Method TO-15, under a standard turnaround time. Copies of the
laboratory analytical reports and sample chain-of-custody records are included in Appendix
C.
3.0 Results
3.1 Indoor Air Samples
The VOC analytical results from this current indoor air sampling event and the previous
events are summarized in Table 1 (Appendix B). The results were compared to the United
States Environmental Protection Agency’s (EPA’s) Regional Screening Levels (RSLs) for
Indoor Air, for both Residential and Industrial land use scenarios. The RSLs listed in Table 1
(Appendix B) are from November 2024 and are based on a Target Cancer Risk of 1x10-6
(one-in-a-million) and a Total Hazard Quotient (THQ) of 1.
Benzene was reported in both of the indoor air samples (IA-1 and IA-2) and both of the
crawl space samples (IA-4 and IA-5) collected from the Monticello Inn at concentrations
that exceed the EPA’s Residential Air RSL. Benzene also exceeded EPA’s Industrial Air RSL in
one of the four samples (IA-1).
Chloroform was reported in the two indoor air samples (IA-1 and IA-2) from the Monticello
Inn at concentrations that exceed EPA’s Industrial Air RSL. Chloroform is a byproduct of
water chlorination and is commonly present in indoor spaces with water sources (e.g.,
kitchens, bathrooms, or sinks). Chloroform has consistently been reported in the indoor air
and crawl space air samples collected from the Monticello Inn property at concentrations
exceeding the EPA’s Residential Air and in some cases the Industrial Air RSLs. The source of
chloroform in the indoor and crawlspace samples was not determined; however, chloroform
is not a contaminant of concern from leaking underground storage tanks and is most likely
associated with water used at the facility.
Vapor Study Report – December 2024 (Third Event)
Brent Redd Property | Monticello, Utah
January 16, 2025 | Terracon Project No. AL067003
Facilities |Environmental | Geotechnical | Materials 5
The remainder of the analytes reported above the laboratory detection limits in the indoor
and crawlspace samples were reported at concentrations below the EPA’s Residential Air and
Industrial Air RSLs.
3.2 Outdoor Air Sample
Analytical results for VOCs in the outdoor air sample collected adjacent to the office of the
Monticello Inn are summarized in Table 1 (Appendix B). The results were compared to the
EPA RSLs for both Residential and Industrial land use scenarios for comparison to the indoor
air sample results.
Benzene was the only constituent reported at a concentration that exceeds an RSL. Benzene
was reported at a concentration that exceeds the EPA’s Residential Air RSLs in the outdoor
air sample collected northeast of the Monticello Inn office (OA-1). The concentration of
benzene in the outdoor air sample (OA-1) was 0.49 micrograms per cubic meter (µg/m3),
which was lower than the indoor air sample (IA-1) collected from the adjacent Monticello
Inn office, which had a concentration of 2.7 µg/m3.
The remainder of the analytes reported above the laboratory detection limits in the outdoor
air sample had concentrations less than their respective EPA RSLs.
3.3 Sub Slab Gas Samples
Analytical results for VOCs in the sub-slab soil gas samples are summarized in Table 1
(Appendix B). The results were compared to the EPA’s Target Sub-Slab and Near-source Soil
Gas Concentration Vapor Intrusion Screening Levels (VISLs) for Residential and Commercial
land use scenarios downloaded from the EPA’s website (https://www.epa.gov/
vaporintrusion/vapor-intrusion-screening-level-calculator) on January 14, 2025. The VISLs
are based on a Target Cancer Risk of 1x10-6 (one-in-a-million) and a THQ of 1.
The VOC concentrations in sub-slab sample VP-1, collected from the basement of the
Monticello Inn, and in sub-slab sample VP-2, collected from the slab-on-grade office area at
the former Brent Redd site were below the laboratory reporting detection limits (RDLs). It
should be noted that the RDL for four of the VOCs exceeded the Residential VISL; however,
those constituents are not constituents of concern for releases from leaking underground
storage tanks and are not anticipated to be present.
Vapor Study Report – December 2024 (Third Event)
Brent Redd Property | Monticello, Utah
January 16, 2025 | Terracon Project No. AL067003
Facilities |Environmental | Geotechnical | Materials 6
4.0 Summary and Conclusions
Several contaminants of concern typical of fuel releases (i.e., benzene, toluene,
ethylbenzene, xylenes, and 1,2,4-trimethylbenzene) were reported in indoor air samples,
crawl space air samples, and/or in the outdoor air sample. Of the constituents reported,
benzene is the only one that was reported at a concentration exceeding EPA’s Residential Air
RSL and in one sample the Industrial Air RSL. Although benzene is one of the primary
constituents of concern in the groundwater plume, it was not reported in either of the sub-
slab vapor samples, which indicates it is unlikely benzene is accumulating beneath the
buildings and intruding into the buildings through cracks or other penetrations. The more
likely source of the benzene reported at the site is from external sources such as vehicle
exhaust (i.e., incomplete combustion of gasoline) from vehicles travelling on Center Street
or idling in the Monticello Inn parking lot.
Chloroform was the only other constituent reported at a concentration that exceeds an RSL.
Chloroform was reported in both indoor air samples collected at the Monticello Inn. As
chloroform is not one of the contaminants of concern associated with fuel releases, and
because it is a common byproduct of water chlorination, it is most likely that the reported
concentrations are a result of water use at the facility.
Based on the results of this investigation, it does not appear vapors from the underlying
petroleum-impacted groundwater is intruding into the onsite building or the Monticello Inn.
However, indoor air samples and crawlspace air samples collected from the Monticello Inn had
concentrations above the EPA’s Residential Air or Commercial Air RSLs. Similar to the
September 2024 sampling event, the indoor air sample collected from the Monticello Inn
office generally had the highest indoor air VOC concentrations of the samples collected. The
benzene concentration in the indoor air sample collected from the Monticello Inn office was
more than the benzene concentration in the outdoor air sample collected adjacent to the
northeast of the office, which can be explained by reduced fresh air mixing inside the building
versus outdoor air.
The source of the indoor air VOCs does not appear to correlate with the petroleum-impacted
groundwater plume. The most likely source of the benzene reported in the building is from
vehicle exhaust from the adjoining Center Street or idling in the Monticello Inn parking lot.
The source of the chloroform is likely from municipal water use in the buildings. Although a
review of chemicals stored at the hotel was conducted that did not identify significant sources,
a variety of other potential sources could contribute to the detected VOCs. For example,
cigarette smoke, cleansers, air fresheners, and aerosol sprays are known to produce airborne
VOCs, and these types of materials could be present inside the Monticello Inn.
Appendix A
Exhibits
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Exhibit
terracon.comPH. 801-545-8500
6952 S High Tech Dr, Ste B
Midvale, UT
Reviewed By:
Drawn By:
Jan 2025
Date:
AL067003
Project No.:
Brent Redd Property
148 East Center Street
Monticello, Utah
Vapor Sample Location Map, December 2024
2
ABA
AST
DATA SOURCES:
ESRI - Basemaps
@A
@A
@A
@A
@A@A
@A
@A
@A
@A
@AVP-1
VP-2
IA-1
IA-2
IA-3
IA-4
(Basement)
IA-5
(Basement)
MW-14
B-3R
MW-19
MW-17
MW-18MW-16
MW-15
MW-5R
MW-20
MW-7
MW-21
OA-1
0 40 8020
Feet
³
³@A Monitoring Well
Indoor Air Sample Location
Soil Gas (Vapor Pin) Location
Outdoor Air Sample
Benezene Concentration in Soil Gas/Air, December 2024
Exceeds EPA Residential Air RSL
Below EPA VISLs/RSLs, as applicable
Benzene Concentration in Groundwater, December 2024
> 300 µg/l (Exceeds UDEQ Tier 1)
5 - 300 µg/l (Exceeds UDEQ ISL)
µg/l - micrograms per liter
Appendix B
Table
Table 1 - VOCs in Indoor Air, Outdoor Air, and Soil Gas
Brent Redd Property, 148 East Center Street, Monticello, Utah
Terracon Project No. AL067003, Task GZQ-59
Analyte CAS Method Units
EPA
Residential
Air RSL
EPA
Industrial
Air RSL
EPA VISL
Residential
EPA VISL
Commercial Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL
BENZENE 71-43-2 TO-15 µg/m3 0.36 1.6 12 52.4 2.2 0.32 2.1 0.32 1.5 0.32 0.52 0.32 0.61 0.32 ND 0.6 ND 0.6
BROMODICHLOROMETHANE 75-27-4 TO-15 µg/m3 0.076 0.33 2.53 11 ND 0.68 ND 0.68 ND 0.68 ND 0.68 ND 0.68 ND 2.7 ND 2.7
BROMOFORM 75-25-2 TO-15 µg/m3 2.6 11 85.1 372 ND 1 ND 1 ND 1 ND 1 ND 1 ND 4.2 ND 4.2
BROMOMETHANE 74-83-9 TO-15 µg/m3 5.2 22 174 730 ND 0.39 ND 0.39 ND 0.39 ND 0.39 ND 0.39 ND 1.6 ND 1.6
CARBON DISULFIDE 75-15-0 TO-15 µg/m3 730 3100 24300 102000 0.73 0.32 ND 0.32 ND 0.32 ND 0.32 ND 0.32 ND 1.3 ND 1.3
CARBON TETRACHLORIDE 56-23-5 TO-15 µg/m3 0.47 2 15.6 68.1 ND 0.64 ND 0.64 ND 0.64 ND 0.64 ND 0.64 ND 1.3 ND 1.3
CHLOROBENZENE 108-90-7 TO-15 µg/m3 52 220 1740 7300 ND 0.47 ND 0.47 ND 0.47 ND 0.47 ND 0.47 ND 1.9 ND 1.9
CHLOROETHANE 75-00-3 TO-15 µg/m3 4200 18000 139000 584000 ND 0.27 ND 0.27 ND 0.27 ND 0.27 ND 0.27 ND 1.6 ND 1.6
CHLOROFORM 67-66-3 TO-15 µg/m3 0.12 0.53 4.07 17.8 0.59 0.25 ND 0.25 ND 0.25 ND 0.25 ND 0.25 ND 1 ND 1
CHLOROMETHANE 74-87-3 TO-15 µg/m3 94 390 3130 13100 1.1 0.21 1.2 0.21 0.97 0.21 0.85 0.21 0.91 0.21 ND 0.8 ND 0.8
CHLORODIBROMOMETHANE 124-48-1 TO-15 µg/m3 NE NE NE NE ND 1.7 ND 1.7 ND 1.7 ND 1.7 ND 1.7 ND 3.5 ND 3.5
1,2-DIBROMOETHANE 106-93-4 TO-15 µg/m3 0.0047 0.02 0.156 0.681 ND 0.78 ND 0.78 ND 0.78 ND 0.78 ND 0.78 ND 3.1 ND 3.1
1,2-DICHLOROBENZENE 95-50-1 TO-15 µg/m3 210 880 6950 29200 ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 2.4 ND 2.4
1,3-DICHLOROBENZENE 541-73-1 TO-15 µg/m3 NE NE NE NE ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 2.4 ND 2.4
1,4-DICHLOROBENZENE 106-46-7 TO-15 µg/m3 0.26 1.1 8.51 37.2 ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 2.4 ND 2.4
1,2-DICHLOROETHANE 107-06-2 TO-15 µg/m3 0.11 0.47 3.6 15.7 0.53 0.41 ND 0.41 ND 0.41 ND 0.41 ND 0.41 ND 1.6 ND 1.6
1,1-DICHLOROETHANE 75-34-3 TO-15 µg/m3 1.8 7.7 58.5 256 ND 0.41 ND 0.41 ND 0.41 ND 0.41 ND 0.41 ND 1.6 ND 1.6
1,1-DICHLOROETHENE 75-35-4 TO-15 µg/m3 4.1 17 138 578 ND 0.4 ND 0.4 ND 0.4 ND 0.4 ND 0.4 ND 1.6 ND 1.6
CIS-1,2-DICHLOROETHENE 156-59-2 TO-15 µg/m3 42 180 1390 5840 ND 0.4 ND 0.4 ND 0.4 ND 0.4 ND 0.4 ND 1.6 ND 1.6
TRANS-1,2-DICHLOROETHENE 156-60-5 TO-15 µg/m3 42 180 1390 5840 ND 0.4 ND 0.4 ND 0.4 ND 0.4 ND 0.4 ND 1.6 ND 1.6
1,2-DICHLOROPROPANE 78-87-5 TO-15 µg/m3 0.76 3.3 25.3 110 0.56 0.47 ND 0.47 ND 0.47 ND 0.47 ND 0.47 ND 1.9 ND 1.9
CIS-1,3-DICHLOROPROPENE 10061-01-5 TO-15 µg/m3 NE NE NE NE ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 1.8 ND 1.8
TRANS-1,3-DICHLOROPROPENE 10061-02-6 TO-15 µg/m3 NE NE NE NE ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 1.8 ND 1.8
DICHLOROTETRAFLUOROETHANE 76-14-2 TO-15 µg/m3 NE NE NE NE ND 0.71 ND 0.71 ND 0.71 ND 0.71 ND 0.71 ND 2.8 ND 2.8
ETHYLBENZENE 100-41-4 TO-15 µg/m3 1.1 4.9 37.4 164 4.4 0.44 0.53 0.44 ND 0.44 ND 0.44 ND 0.44 ND 1.8 ND 1.8
4-ETHYLTOLUENE 622-96-8 TO-15 µg/m3 NE NE NE NE 0.6 0.5 ND 0.5 ND 0.5 ND 0.5 ND 0.5 ND 2 ND 2
TRICHLOROFLUOROMETHANE 75-69-4 TO-15 µg/m3 NE NE NE NE 1.1 0.56 1.1 0.56 1.1 0.56 1.2 0.56 1.2 0.56 ND 2.3 ND 2.3
DICHLORODIFLUOROMETHANE 75-71-8 TO-15 µg/m3 100 440 3480 14600 ND 1 ND 1 ND 1 ND 1 ND 1 ND 4 ND 4
1,1,2-TRICHLOROTRIFLUOROETHANE 76-13-1 TO-15 µg/m3 5200 22000 174000 730000 ND 0.77 ND 0.77 ND 0.77 ND 0.77 ND 0.77 ND 3.1 ND 3.1
HEXACHLORO-1,3-BUTADIENE 87-68-3 TO-15 µg/m3 0.13 0.56 4.25 18.6 ND 2.7 ND 2.7 ND 2.7 ND 2.7 ND 2.7 ND 11 ND 11
METHYLENE CHLORIDE 75-09-2 TO-15 µg/m3 100 1200 3380 40900 5.3 0.35 ND 0.35 ND 0.35 ND 0.35 0.35 0.35 ND 1.4 ND 1.4
METHYL BUTYL KETONE 591-78-6 TO-15 µg/m3 31 130 1040 4380 ND 0.83 ND 0.83 ND 0.83 ND 0.83 ND 0.83 ND 3.3 ND 3.3
2-BUTANONE (MEK)78-93-3 TO-15 µg/m3 5200 22000 174000 730000 40 0.6 0.75 0.6 ND 0.6 ND 0.6 ND 0.6 ND 2.4 ND 2.4
4-METHYL-2-PENTANONE (MIBK)108-10-1 TO-15 µg/m3 3100 13000 104000 438000 1.1 0.83 ND 0.83 ND 0.83 ND 0.83 ND 0.83 ND 3.3 ND 3.3
STYRENE 100-42-5 TO-15 µg/m3 1000 4400 34800 146000 9.9 0.43 ND 0.43 ND 0.43 ND 0.43 ND 0.43 ND 1.7 ND 1.7
1,1,2,2-TETRACHLOROETHANE 79-34-5 TO-15 µg/m3 0.048 0.21 1.61 7.05 ND 0.7 ND 0.7 ND 0.7 ND 0.7 ND 0.7 ND 2.8 ND 2.8
1,1,1,2-TETRACHLOROETHANE 630-20-6 TO-15 µg/m3 0.38 1.7 12.6 55.2 ND 0.7 ND 0.7 ND 0.7 ND 0.7 ND 0.7 ND 2.8 ND 2.8
TETRACHLOROETHENE 127-18-4 TO-15 µg/m3 11 47 360 1570 ND 0.69 ND 0.69 ND 0.69 ND 0.69 ND 0.69 ND 2.8 ND 2.8
TOLUENE 108-88-3 TO-15 µg/m3 5200 22000 174000 730000 57 0.76 30 0.76 1.9 0.76 0.8 0.76 0.99 0.76 ND 3.1 ND 3.1
1,2,4-TRICHLOROBENZENE 120-82-1 TO-15 µg/m3 2.1 8.8 69.5 292 ND 1.9 ND 1.9 ND 1.9 ND 1.9 ND 1.9 ND 7.5 ND 7.5
Lab Sample ID E312005-01 E312005-02
Client Sample ID IA-1 IA-2
11/28/2023 11/28/2023Date Collected 11/28/2023 11/28/2023 11/28/202311/28/202311/28/2023
E312005-03 E312005-04 E312005-05 E312005-06 E312005-07
IA-4 IA-5 VP-1 VP-2IA-3
Compared to RSLs Compared to VISLs
Page 1 of 8
Table 1 - VOCs in Indoor Air, Outdoor Air, and Soil Gas
Brent Redd Property, 148 East Center Street, Monticello, Utah
Terracon Project No. AL067003, Task GZQ-59
Analyte CAS Method Units
EPA
Residential
Air RSL
EPA
Industrial
Air RSL
EPA VISL
Residential
EPA VISL
Commercial Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL
Lab Sample ID E312005-01 E312005-02
Client Sample ID IA-1 IA-2
11/28/2023 11/28/2023Date Collected 11/28/2023 11/28/2023 11/28/202311/28/202311/28/2023
E312005-03 E312005-04 E312005-05 E312005-06 E312005-07
IA-4 IA-5 VP-1 VP-2IA-3
Compared to RSLs Compared to VISLs
1,1,1-TRICHLOROETHANE 71-55-6 TO-15 µg/m3 5200 22000 174000 730000 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 2.2 ND 2.2
1,1,2-TRICHLOROETHANE 79-00-5 TO-15 µg/m3 0.18 0.77 5.85 25.6 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 2.2 ND 2.2
TRICHLOROETHENE 79-01-6 TO-15 µg/m3 0.48 3 15.9 99.7 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 2.2 ND 2.2
1,2,4-TRIMETHYLBENZENE 95-63-6 TO-15 µg/m3 63 260 2090 8760 1.4 0.5 ND 0.5 ND 0.5 ND 0.5 ND 0.5 ND 2 ND 2
1,3,5-TRIMETHYLBENZENE 108-67-8 TO-15 µg/m3 63 260 2090 8760 0.5 0.5 ND 0.5 ND 0.5 ND 0.5 ND 0.5 ND 2 ND 2
VINYL CHLORIDE 75-01-4 TO-15 µg/m3 NE NE 5.59 92.9 ND 0.13 ND 0.13 ND 0.13 ND 0.13 ND 0.13 ND 0.5 ND 0.5
M,P-XYLENE 178601-23-1 TO-15 µg/m3 NE NE NE NE 13 0.44 1.8 0.44 0.97 0.44 0.57 0.44 0.66 0.44 3.7 1.8 ND 1.8
O-XYLENE 95-47-6 TO-15 µg/m3 NE NE 3480 14600 5.1 0.44 0.7 0.44 ND 0.44 ND 0.44 ND 0.44 ND 1.8 ND 1.8
EPA VISL: Environmental Protection Agency Target Sub-Slab and Near-source Soil Gas Concentration (TSSNSGC) Vapor
Intrusion Screening Level (Downloaded from EPA website January 14, 2025, TR=1E-06; THQ=1.0).
https://www.epa.gov/vaporintrusion/vapor-intrusion-screening-level-calculator
EPA RSL:Environmental Protection Agency Regional Screening Levels for Residential and Industrial Air (November 2024,
TR=1E-06; THQ=1.0). https://www.epa.gov/risk/regional-screening-levels-rsls-generic-tables
Qualifiers (Q):
NE:Not established. ND: Not detected at or above the Reporting Detection Limit (RDL).µg/m3:micrograms per cubic
meter.Bold values exceed the RDL. Blue italicized non-detect results have RDLs exceeding one or more of the EPA RSLs or
VISLs, as applicable.
Page 2 of 8
Table 1 - VOCs in Indoor Air, Outdoor Air, and Soil Gas
Brent Redd Property, 148 East Center Street, Monticello, Utah
Terracon Project No. AL067003, Task GZQ-59
Analyte CAS Method Units
EPA
Residential
Air RSL
EPA
Industrial
Air RSL
EPA VISL
Residential
EPA VISL
Commercial
BENZENE 71-43-2 TO-15 µg/m3 0.36 1.6 12 52.4
BROMODICHLOROMETHANE 75-27-4 TO-15 µg/m3 0.076 0.33 2.53 11
BROMOFORM 75-25-2 TO-15 µg/m3 2.6 11 85.1 372
BROMOMETHANE 74-83-9 TO-15 µg/m3 5.2 22 174 730
CARBON DISULFIDE 75-15-0 TO-15 µg/m3 730 3100 24300 102000
CARBON TETRACHLORIDE 56-23-5 TO-15 µg/m3 0.47 2 15.6 68.1
CHLOROBENZENE 108-90-7 TO-15 µg/m3 52 220 1740 7300
CHLOROETHANE 75-00-3 TO-15 µg/m3 4200 18000 139000 584000
CHLOROFORM 67-66-3 TO-15 µg/m3 0.12 0.53 4.07 17.8
CHLOROMETHANE 74-87-3 TO-15 µg/m3 94 390 3130 13100
CHLORODIBROMOMETHANE 124-48-1 TO-15 µg/m3 NE NE NE NE
1,2-DIBROMOETHANE 106-93-4 TO-15 µg/m3 0.0047 0.02 0.156 0.681
1,2-DICHLOROBENZENE 95-50-1 TO-15 µg/m3 210 880 6950 29200
1,3-DICHLOROBENZENE 541-73-1 TO-15 µg/m3 NE NE NE NE
1,4-DICHLOROBENZENE 106-46-7 TO-15 µg/m3 0.26 1.1 8.51 37.2
1,2-DICHLOROETHANE 107-06-2 TO-15 µg/m3 0.11 0.47 3.6 15.7
1,1-DICHLOROETHANE 75-34-3 TO-15 µg/m3 1.8 7.7 58.5 256
1,1-DICHLOROETHENE 75-35-4 TO-15 µg/m3 4.1 17 138 578
CIS-1,2-DICHLOROETHENE 156-59-2 TO-15 µg/m3 42 180 1390 5840
TRANS-1,2-DICHLOROETHENE 156-60-5 TO-15 µg/m3 42 180 1390 5840
1,2-DICHLOROPROPANE 78-87-5 TO-15 µg/m3 0.76 3.3 25.3 110
CIS-1,3-DICHLOROPROPENE 10061-01-5 TO-15 µg/m3 NE NE NE NE
TRANS-1,3-DICHLOROPROPENE 10061-02-6 TO-15 µg/m3 NE NE NE NE
DICHLOROTETRAFLUOROETHANE 76-14-2 TO-15 µg/m3 NE NE NE NE
ETHYLBENZENE 100-41-4 TO-15 µg/m3 1.1 4.9 37.4 164
4-ETHYLTOLUENE 622-96-8 TO-15 µg/m3 NE NE NE NE
TRICHLOROFLUOROMETHANE 75-69-4 TO-15 µg/m3 NE NE NE NE
DICHLORODIFLUOROMETHANE 75-71-8 TO-15 µg/m3 100 440 3480 14600
1,1,2-TRICHLOROTRIFLUOROETHANE 76-13-1 TO-15 µg/m3 5200 22000 174000 730000
HEXACHLORO-1,3-BUTADIENE 87-68-3 TO-15 µg/m3 0.13 0.56 4.25 18.6
METHYLENE CHLORIDE 75-09-2 TO-15 µg/m3 100 1200 3380 40900
METHYL BUTYL KETONE 591-78-6 TO-15 µg/m3 31 130 1040 4380
2-BUTANONE (MEK)78-93-3 TO-15 µg/m3 5200 22000 174000 730000
4-METHYL-2-PENTANONE (MIBK)108-10-1 TO-15 µg/m3 3100 13000 104000 438000
STYRENE 100-42-5 TO-15 µg/m3 1000 4400 34800 146000
1,1,2,2-TETRACHLOROETHANE 79-34-5 TO-15 µg/m3 0.048 0.21 1.61 7.05
1,1,1,2-TETRACHLOROETHANE 630-20-6 TO-15 µg/m3 0.38 1.7 12.6 55.2
TETRACHLOROETHENE 127-18-4 TO-15 µg/m3 11 47 360 1570
TOLUENE 108-88-3 TO-15 µg/m3 5200 22000 174000 730000
1,2,4-TRICHLOROBENZENE 120-82-1 TO-15 µg/m3 2.1 8.8 69.5 292
Lab Sample ID
Client Sample ID
Date Collected
Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL
0.91 0.32 0.32 0.32 0.32 0.32 ND 0.32 ND 0.32 1 0.32 ND 0.6 ND 0.6
ND 0.68 ND 0.68 ND 0.68 ND 0.68 ND 0.68 ND 0.68 ND 2.7 ND 2.7
ND 1 ND 1 ND 1 ND 1 ND 1 ND 1 ND 4.2 ND 4.2
ND 0.39 ND 0.39 ND 0.39 ND 0.39 ND 0.39 ND 0.39 ND 1.6 ND 1.6
0.57 0.32 ND 0.32 ND 0.32 ND 0.32 ND 0.32 0.38 0.32 ND 1.3 ND 1.3
0.64 0.64 ND 0.64 ND 0.64 ND 0.64 ND 0.64 ND 0.64 ND 1.3 ND 1.3
ND 0.47 ND 0.47 ND 0.47 ND 0.47 ND 0.47 ND 0.47 ND 1.9 ND 1.9
ND 0.27 ND 0.27 ND 0.27 ND 0.27 ND 0.27 ND 0.27 ND 1.6 ND 1.6
2 0.25 1 0.25 1.6 0.25 0.35 0.25 0.49 0.25 0.25 0.25 ND 1 ND 1
2 0.21 1.8 0.21 1.5 0.21 1.2 0.21 1.1 0.21 1.9 0.21 ND 0.8 ND 0.8
ND 1.7 ND 1.7 ND 1.7 ND 1.7 ND 1.7 ND 1.7 ND 3.5 ND 3.5
ND 0.78 ND 0.78 ND 0.78 ND 0.78 ND 0.78 ND 0.78 ND 3.1 ND 3.1
ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 2.4 ND 2.4
0.61 0.61 ND 0.61 ND 0.61 ND 0.61 ND 0.61 3.7 0.61 ND 2.4 ND 2.4
ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 2.4 ND 2.4
ND 0.41 ND 0.41 ND 0.41 ND 0.41 ND 0.41 ND 0.41 ND 1.6 ND 1.6
ND 0.41 ND 0.41 ND 0.41 ND 0.41 ND 0.41 ND 0.41 ND 1.6 ND 1.6
ND 0.4 ND 0.4 ND 0.4 ND 0.4 ND 0.4 ND 0.4 ND 1.6 ND 1.6
ND 0.4 ND 0.4 ND 0.4 ND 0.4 ND 0.4 ND 0.4 ND 1.6 ND 1.6
ND 0.4 ND 0.4 ND 0.4 ND 0.4 ND 0.4 ND 0.4 ND 1.6 ND 1.6
ND 0.47 ND 0.47 ND 0.47 ND 0.47 ND 0.47 ND 0.47 ND 1.9 ND 1.9
ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 1.8 ND 1.8
ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 1.8 ND 1.8
ND 0.71 ND 0.71 ND 0.71 ND 0.71 ND 0.71 ND 0.71 ND 2.8 ND 2.8
1.6 0.44 0.62 0.44 ND 0.44 ND 0.44 ND 0.44 1.1 0.44 ND 1.8 ND 1.8
ND 0.5 ND 0.5 ND 0.5 ND 0.5 ND 0.5 ND 0.5 ND 2 ND 2
1.7 0.56 1.6 0.56 1.6 0.56 1.8 0.56 1.6 0.56 1.2 0.56 ND 2.3 ND 2.3
1.4 1 1.4 1 1.3 1 1.4 1 1.4 1 1.3 1 ND 4 ND 4
ND 0.77 ND 0.77 ND 0.77 ND 0.77 ND 0.77 ND 0.77 ND 3.1 ND 3.1
ND 2.7 ND 2.7 ND 2.7 ND 2.7 ND 2.7 ND 2.7 ND 11 ND 11
0.42 0.35 0.39 0.35 ND 0.35 ND 0.35 ND 0.35 0.35 0.35 ND 1.4 ND 1.4
ND 0.83 ND 0.83 ND 0.83 ND 0.83 ND 0.83 ND 0.83 ND 3.3 ND 3.3
7.9 0.6 3.7 0.6 2.2 0.6 1.9 0.6 1.3 0.6 76 0.6 4 2.4 2.4 2.4
0.91 0.83 ND 0.83 ND 0.83 ND 0.83 ND 0.83 ND 0.83 ND 3.3 ND 3.3
0.91 0.43 2.4 0.43 1.2 0.43 ND 0.43 ND 0.43 0.47 0.43 ND 1.7 ND 1.7
ND 0.7 ND 0.7 ND 0.7 ND 0.7 ND 0.7 ND 0.7 ND 2.8 ND 2.8
ND 0.7 ND 0.7 ND 0.7 ND 0.7 ND 0.7 ND 0.7 ND 2.8 ND 2.8
ND 0.69 ND 0.69 ND 0.69 ND 0.69 ND 0.69 ND 0.69 ND 2.8 ND 2.8
4.9 0.76 2.7 0.76 1.7 0.76 1.1 0.76 0.92 0.76 3.1 0.76 ND 3.1 ND 3.1
ND 1.9 ND 1.9 ND 1.9 ND 1.9 ND 1.9 ND 1.9 ND 7.5 ND 7.5
6/26/2024 6/26/2024 6/26/2024 6/26/2024 6/26/2024
E407012-01
IA-1
6/26/2024 6/25/2024
E407012-02 E407012-03 E407012-04 E407012-05 E407012-06 E407012-07
IA-2 IA-3 IA-4 IA-5 OA-1 VP-1
E407012-08
VP-2
6/25/2024
Compared to RSLs Compared to VISLs
Page 3 of 8
Table 1 - VOCs in Indoor Air, Outdoor Air, and Soil Gas
Brent Redd Property, 148 East Center Street, Monticello, Utah
Terracon Project No. AL067003, Task GZQ-59
Analyte CAS Method Units
EPA
Residential
Air RSL
EPA
Industrial
Air RSL
EPA VISL
Residential
EPA VISL
Commercial
Lab Sample ID
Client Sample ID
Date Collected
1,1,1-TRICHLOROETHANE 71-55-6 TO-15 µg/m3 5200 22000 174000 730000
1,1,2-TRICHLOROETHANE 79-00-5 TO-15 µg/m3 0.18 0.77 5.85 25.6
TRICHLOROETHENE 79-01-6 TO-15 µg/m3 0.48 3 15.9 99.7
1,2,4-TRIMETHYLBENZENE 95-63-6 TO-15 µg/m3 63 260 2090 8760
1,3,5-TRIMETHYLBENZENE 108-67-8 TO-15 µg/m3 63 260 2090 8760
VINYL CHLORIDE 75-01-4 TO-15 µg/m3 NE NE 5.59 92.9
M,P-XYLENE 178601-23-1 TO-15 µg/m3 NE NE NE NE
O-XYLENE 95-47-6 TO-15 µg/m3 NE NE 3480 14600
EPA VISL: Environmental Protection Agency Target Sub-Slab and Near-source Soil Gas Concentration (TSSNSGC) Vapor
Intrusion Screening Level (Downloaded from EPA website January 14, 2025, TR=1E-06; THQ=1.0).
https://www.epa.gov/vaporintrusion/vapor-intrusion-screening-level-calculator
EPA RSL:Environmental Protection Agency Regional Screening Levels for Residential and Industrial Air (November 2024,
TR=1E-06; THQ=1.0). https://www.epa.gov/risk/regional-screening-levels-rsls-generic-tables
Qualifiers (Q):
NE:Not established. ND: Not detected at or above the Reporting Detection Limit (RDL).µg/m3:micrograms per cubic
meter.Bold values exceed the RDL. Blue italicized non-detect results have RDLs exceeding one or more of the EPA RSLs or
VISLs, as applicable.
Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL
6/26/2024 6/26/2024 6/26/2024 6/26/2024 6/26/2024
E407012-01
IA-1
6/26/2024 6/25/2024
E407012-02 E407012-03 E407012-04 E407012-05 E407012-06 E407012-07
IA-2 IA-3 IA-4 IA-5 OA-1 VP-1
E407012-08
VP-2
6/25/2024
Compared to RSLs Compared to VISLs
ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 2.2 ND 2.2
ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 2.2 ND 2.2
ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 2.2 ND 2.2
0.95 0.5 ND 0.5 ND 0.5 ND 0.5 ND 0.5 0.5 0.5 ND 2 ND 2
ND 0.5 ND 0.5 ND 0.5 ND 0.5 ND 0.5 ND 0.5 ND 2 ND 2
ND 0.13 ND 0.13 ND 0.13 ND 0.13 ND 0.13 ND 0.13 ND 0.5 ND 0.5
6.2 0.44 1.2 0.44 1.2 0.44 0.7 0.44 0.53 0.44 4.4 0.44 2.2 1.8 2.3 1.8
2.4 0.44 0.84 0.44 0.57 0.44 ND 0.44 ND 0.44 1.6 0.44 ND 1.8 ND 1.8
Page 4 of 8
Table 1 - VOCs in Indoor Air, Outdoor Air, and Soil Gas
Brent Redd Property, 148 East Center Street, Monticello, Utah
Terracon Project No. AL067003, Task GZQ-59
Analyte CAS Method Units
EPA
Residential
Air RSL
EPA
Industrial
Air RSL
EPA VISL
Residential
EPA VISL
Commercial
BENZENE 71-43-2 TO-15 µg/m3 0.36 1.6 12 52.4
BROMODICHLOROMETHANE 75-27-4 TO-15 µg/m3 0.076 0.33 2.53 11
BROMOFORM 75-25-2 TO-15 µg/m3 2.6 11 85.1 372
BROMOMETHANE 74-83-9 TO-15 µg/m3 5.2 22 174 730
CARBON DISULFIDE 75-15-0 TO-15 µg/m3 730 3100 24300 102000
CARBON TETRACHLORIDE 56-23-5 TO-15 µg/m3 0.47 2 15.6 68.1
CHLOROBENZENE 108-90-7 TO-15 µg/m3 52 220 1740 7300
CHLOROETHANE 75-00-3 TO-15 µg/m3 4200 18000 139000 584000
CHLOROFORM 67-66-3 TO-15 µg/m3 0.12 0.53 4.07 17.8
CHLOROMETHANE 74-87-3 TO-15 µg/m3 94 390 3130 13100
CHLORODIBROMOMETHANE 124-48-1 TO-15 µg/m3 NE NE NE NE
1,2-DIBROMOETHANE 106-93-4 TO-15 µg/m3 0.0047 0.02 0.156 0.681
1,2-DICHLOROBENZENE 95-50-1 TO-15 µg/m3 210 880 6950 29200
1,3-DICHLOROBENZENE 541-73-1 TO-15 µg/m3 NE NE NE NE
1,4-DICHLOROBENZENE 106-46-7 TO-15 µg/m3 0.26 1.1 8.51 37.2
1,2-DICHLOROETHANE 107-06-2 TO-15 µg/m3 0.11 0.47 3.6 15.7
1,1-DICHLOROETHANE 75-34-3 TO-15 µg/m3 1.8 7.7 58.5 256
1,1-DICHLOROETHENE 75-35-4 TO-15 µg/m3 4.1 17 138 578
CIS-1,2-DICHLOROETHENE 156-59-2 TO-15 µg/m3 42 180 1390 5840
TRANS-1,2-DICHLOROETHENE 156-60-5 TO-15 µg/m3 42 180 1390 5840
1,2-DICHLOROPROPANE 78-87-5 TO-15 µg/m3 0.76 3.3 25.3 110
CIS-1,3-DICHLOROPROPENE 10061-01-5 TO-15 µg/m3 NE NE NE NE
TRANS-1,3-DICHLOROPROPENE 10061-02-6 TO-15 µg/m3 NE NE NE NE
DICHLOROTETRAFLUOROETHANE 76-14-2 TO-15 µg/m3 NE NE NE NE
ETHYLBENZENE 100-41-4 TO-15 µg/m3 1.1 4.9 37.4 164
4-ETHYLTOLUENE 622-96-8 TO-15 µg/m3 NE NE NE NE
TRICHLOROFLUOROMETHANE 75-69-4 TO-15 µg/m3 NE NE NE NE
DICHLORODIFLUOROMETHANE 75-71-8 TO-15 µg/m3 100 440 3480 14600
1,1,2-TRICHLOROTRIFLUOROETHANE 76-13-1 TO-15 µg/m3 5200 22000 174000 730000
HEXACHLORO-1,3-BUTADIENE 87-68-3 TO-15 µg/m3 0.13 0.56 4.25 18.6
METHYLENE CHLORIDE 75-09-2 TO-15 µg/m3 100 1200 3380 40900
METHYL BUTYL KETONE 591-78-6 TO-15 µg/m3 31 130 1040 4380
2-BUTANONE (MEK)78-93-3 TO-15 µg/m3 5200 22000 174000 730000
4-METHYL-2-PENTANONE (MIBK)108-10-1 TO-15 µg/m3 3100 13000 104000 438000
STYRENE 100-42-5 TO-15 µg/m3 1000 4400 34800 146000
1,1,2,2-TETRACHLOROETHANE 79-34-5 TO-15 µg/m3 0.048 0.21 1.61 7.05
1,1,1,2-TETRACHLOROETHANE 630-20-6 TO-15 µg/m3 0.38 1.7 12.6 55.2
TETRACHLOROETHENE 127-18-4 TO-15 µg/m3 11 47 360 1570
TOLUENE 108-88-3 TO-15 µg/m3 5200 22000 174000 730000
1,2,4-TRICHLOROBENZENE 120-82-1 TO-15 µg/m3 2.1 8.8 69.5 292
Lab Sample ID
Client Sample ID
Date Collected
Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL
0.94 0.32 0.81 0.32 0.42 0.32 0.65 0.32 0.74 0.32 ND 0.6 ND 0.6
ND 0.68 ND 0.68 ND 0.68 ND 0.68 ND 0.68 ND 2.7 ND 2.7
ND 1.0 ND 1.0 ND 1.0 ND 1.0 ND 1.0 ND 4.2 ND 4.2
ND 0.39 ND 0.39 ND 0.39 ND 0.39 ND 0.39 ND 1.6 ND 1.6
ND 0.32 ND 0.32 ND 0.32 0.57 0.32 ND 0.32 ND 1.3 ND 1.3
1.1 0.64 0.96 0.64 1.0 0.64 1.1 0.64 0.96 0.64 ND 1.3 ND 1.3
ND 0.47 ND 0.47 ND 0.47 ND 0.47 ND 0.47 ND 1.9 ND 1.9
ND 0.27 ND 0.27 ND 0.27 ND 0.27 ND 0.27 ND 0.8 ND 0.8
1.1 0.25 1.4 0.25 0.64 0.25 0.94 0.25 0.25 0.25 ND 1.0 ND 1.0
0.66 0.21 0.33 0.21 1.7 0.21 1.4 0.21 0.64 0.21 ND 1.6 ND 1.6
ND 1.7 ND 1.7 ND 1.7 ND 1.7 ND 1.7 ND 3.5 ND 3.5
ND 0.78 ND 0.78 ND 0.78 ND 0.78 ND 0.78 ND 3.1 ND 3.1
ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 2.4 ND 2.4
0.67 0.61 ND 0.61 ND 0.61 ND 0.61 5.8 0.61 ND 2.4 ND 2.4
0.61 0.61 ND 0.61 ND 0.61 0.91 0.61 ND 0.61 ND 2.4 ND 2.4
ND 0.41 ND 0.41 ND 0.41 ND 0.41 ND 0.41 ND 1.6 ND 1.6
0.66 0.41 0.41 0.41 ND 0.41 ND 0.41 0.90 0.41 ND 1.6 ND 1.6
ND 0.40 ND 0.40 ND 0.40 ND 0.40 ND 0.40 ND 1.6 ND 1.6
ND 0.40 ND 0.40 ND 0.40 ND 0.40 ND 0.40 ND 1.6 ND 1.6
ND 0.40 ND 0.40 ND 0.40 ND 0.40 ND 0.40 ND 1.6 ND 1.6
ND 0.47 ND 0.47 ND 0.47 ND 0.47 ND 0.47 ND 1.9 ND 1.9
ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 1.8 ND 1.8
ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 1.8 ND 1.8
ND 0.71 ND 0.71 ND 0.71 ND 0.71 ND 0.71 ND 2.8 ND 2.8
0.97 0.44 0.44 0.44 ND 0.44 0.48 0.44 0.48 0.44 ND 1.8 ND 1.8
2.2 0.50 ND 0.50 ND 0.50 ND 0.50 ND 0.50 ND 2.0 ND 2.0
1.7 0.56 1.1 0.56 2.5 0.56 2.1 0.56 1.7 0.56 2.8 2.3 2.4 2.3
1.7 1.0 1.3 1.0 3.4 1.0 3.0 1.0 1.6 1.0 4.4 4.0 4.9 4.0
0.85 0.77 ND 0.77 1.0 0.77 1.0 0.77 0.77 0.77 ND 3.1 ND 3.1
ND 2.7 ND 2.7 ND 2.7 ND 2.7 ND 2.7 ND 11 ND 11
0.49 0.35 0.42 0.35 0.49 0.35 0.74 0.35 0.42 0.35 ND 1.4 ND 1.4
ND 0.83 ND 0.83 ND 0.83 ND 0.83 ND 0.83 ND 3.3 ND 3.3
2.7 0.60 2.2 0.60 1.1 0.60 10 0.60 3.9 0.60 11 2.4 ND 2.4
ND 0.83 ND 0.83 ND 0.83 ND 0.83 1.1 0.83 ND 3.3 ND 3.3
0.52 0.43 0.99 0.43 ND 0.43 0.52 0.43 ND 0.43 ND 1.7 ND 1.7
ND 0.70 ND 0.70 ND 0.70 ND 0.70 ND 0.70 ND 2.8 ND 2.8
ND 0.70 ND 0.70 ND 0.70 ND 0.70 ND 0.70 ND 2.8 ND 2.8
ND 0.69 ND 0.69 ND 0.69 ND 0.69 ND 0.69 ND 2.8 ND 2.8
2.5 0.76 3.7 0.76 1.6 0.76 29 0.76 3.4 0.76 4.2 3.1 ND 3.1
ND 1.9 ND 1.9 ND 1.9 ND 1.9 ND 1.9 ND 7.5 ND 7.5
9/24/2024
E410009-07E410009-04
IA-5
9/25/2024
E410009-05
OA-1
9/25/2024
E410009-03
IA-4
9/25/2024
E410009-02
IA-2
9/25/2024
E410009-01
IA-1
9/25/2024
E410009-06
VP-1
9/24/2024
VP-2
Compared to VISLsCompared to RSLs
Page 5 of 8
Table 1 - VOCs in Indoor Air, Outdoor Air, and Soil Gas
Brent Redd Property, 148 East Center Street, Monticello, Utah
Terracon Project No. AL067003, Task GZQ-59
Analyte CAS Method Units
EPA
Residential
Air RSL
EPA
Industrial
Air RSL
EPA VISL
Residential
EPA VISL
Commercial
Lab Sample ID
Client Sample ID
Date Collected
1,1,1-TRICHLOROETHANE 71-55-6 TO-15 µg/m3 5200 22000 174000 730000
1,1,2-TRICHLOROETHANE 79-00-5 TO-15 µg/m3 0.18 0.77 5.85 25.6
TRICHLOROETHENE 79-01-6 TO-15 µg/m3 0.48 3 15.9 99.7
1,2,4-TRIMETHYLBENZENE 95-63-6 TO-15 µg/m3 63 260 2090 8760
1,3,5-TRIMETHYLBENZENE 108-67-8 TO-15 µg/m3 63 260 2090 8760
VINYL CHLORIDE 75-01-4 TO-15 µg/m3 NE NE 5.59 92.9
M,P-XYLENE 178601-23-1 TO-15 µg/m3 NE NE NE NE
O-XYLENE 95-47-6 TO-15 µg/m3 NE NE 3480 14600
EPA VISL: Environmental Protection Agency Target Sub-Slab and Near-source Soil Gas Concentration (TSSNSGC) Vapor
Intrusion Screening Level (Downloaded from EPA website January 14, 2025, TR=1E-06; THQ=1.0).
https://www.epa.gov/vaporintrusion/vapor-intrusion-screening-level-calculator
EPA RSL:Environmental Protection Agency Regional Screening Levels for Residential and Industrial Air (November 2024,
TR=1E-06; THQ=1.0). https://www.epa.gov/risk/regional-screening-levels-rsls-generic-tables
Qualifiers (Q):
NE:Not established. ND: Not detected at or above the Reporting Detection Limit (RDL).µg/m3:micrograms per cubic
meter.Bold values exceed the RDL. Blue italicized non-detect results have RDLs exceeding one or more of the EPA RSLs or
VISLs, as applicable.
Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL
9/24/2024
E410009-07E410009-04
IA-5
9/25/2024
E410009-05
OA-1
9/25/2024
E410009-03
IA-4
9/25/2024
E410009-02
IA-2
9/25/2024
E410009-01
IA-1
9/25/2024
E410009-06
VP-1
9/24/2024
VP-2
Compared to VISLsCompared to RSLs
ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 2.2 ND 2.2
ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 2.2 ND 2.2
ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 2.2 ND 2.2
19 0.50 0.75 0.50 2.7 0.50 0.80 0.50 0.75 0.50 ND 2.0 ND 2.0
4.2 0.50 ND 0.50 0.60 0.50 ND 0.50 ND 0.50 ND 2.0 ND 2.0
ND 0.13 ND 0.13 ND 0.13 ND 0.13 ND 0.13 ND 0.5 ND 0.5
3.5 0.44 1.5 0.44 1.2 0.44 2.2 0.44 2.0 0.44 3.3 1.8 1.9 1.8
1.8 0.44 0.66 0.44 0.62 0.44 1.1 0.44 0.84 0.44 ND 1.8 ND 1.8
Page 6 of 8
Table 1 - VOCs in Indoor Air, Outdoor Air, and Soil Gas
Brent Redd Property, 148 East Center Street, Monticello, Utah
Terracon Project No. AL067003, Task GZQ-59
Analyte CAS Method Units
EPA
Residential
Air RSL
EPA
Industrial
Air RSL
EPA VISL
Residential
EPA VISL
Commercial
BENZENE 71-43-2 TO-15 µg/m3 0.36 1.6 12 52.4
BROMODICHLOROMETHANE 75-27-4 TO-15 µg/m3 0.076 0.33 2.53 11
BROMOFORM 75-25-2 TO-15 µg/m3 2.6 11 85.1 372
BROMOMETHANE 74-83-9 TO-15 µg/m3 5.2 22 174 730
CARBON DISULFIDE 75-15-0 TO-15 µg/m3 730 3100 24300 102000
CARBON TETRACHLORIDE 56-23-5 TO-15 µg/m3 0.47 2 15.6 68.1
CHLOROBENZENE 108-90-7 TO-15 µg/m3 52 220 1740 7300
CHLOROETHANE 75-00-3 TO-15 µg/m3 4200 18000 139000 584000
CHLOROFORM 67-66-3 TO-15 µg/m3 0.12 0.53 4.07 17.8
CHLOROMETHANE 74-87-3 TO-15 µg/m3 94 390 3130 13100
CHLORODIBROMOMETHANE 124-48-1 TO-15 µg/m3 NE NE NE NE
1,2-DIBROMOETHANE 106-93-4 TO-15 µg/m3 0.0047 0.02 0.156 0.681
1,2-DICHLOROBENZENE 95-50-1 TO-15 µg/m3 210 880 6950 29200
1,3-DICHLOROBENZENE 541-73-1 TO-15 µg/m3 NE NE NE NE
1,4-DICHLOROBENZENE 106-46-7 TO-15 µg/m3 0.26 1.1 8.51 37.2
1,2-DICHLOROETHANE 107-06-2 TO-15 µg/m3 0.11 0.47 3.6 15.7
1,1-DICHLOROETHANE 75-34-3 TO-15 µg/m3 1.8 7.7 58.5 256
1,1-DICHLOROETHENE 75-35-4 TO-15 µg/m3 4.1 17 138 578
CIS-1,2-DICHLOROETHENE 156-59-2 TO-15 µg/m3 42 180 1390 5840
TRANS-1,2-DICHLOROETHENE 156-60-5 TO-15 µg/m3 42 180 1390 5840
1,2-DICHLOROPROPANE 78-87-5 TO-15 µg/m3 0.76 3.3 25.3 110
CIS-1,3-DICHLOROPROPENE 10061-01-5 TO-15 µg/m3 NE NE NE NE
TRANS-1,3-DICHLOROPROPENE 10061-02-6 TO-15 µg/m3 NE NE NE NE
DICHLOROTETRAFLUOROETHANE 76-14-2 TO-15 µg/m3 NE NE NE NE
ETHYLBENZENE 100-41-4 TO-15 µg/m3 1.1 4.9 37.4 164
4-ETHYLTOLUENE 622-96-8 TO-15 µg/m3 NE NE NE NE
TRICHLOROFLUOROMETHANE 75-69-4 TO-15 µg/m3 NE NE NE NE
DICHLORODIFLUOROMETHANE 75-71-8 TO-15 µg/m3 100 440 3480 14600
1,1,2-TRICHLOROTRIFLUOROETHANE 76-13-1 TO-15 µg/m3 5200 22000 174000 730000
HEXACHLORO-1,3-BUTADIENE 87-68-3 TO-15 µg/m3 0.13 0.56 4.25 18.6
METHYLENE CHLORIDE 75-09-2 TO-15 µg/m3 100 1200 3380 40900
METHYL BUTYL KETONE 591-78-6 TO-15 µg/m3 31 130 1040 4380
2-BUTANONE (MEK)78-93-3 TO-15 µg/m3 5200 22000 174000 730000
4-METHYL-2-PENTANONE (MIBK)108-10-1 TO-15 µg/m3 3100 13000 104000 438000
STYRENE 100-42-5 TO-15 µg/m3 1000 4400 34800 146000
1,1,2,2-TETRACHLOROETHANE 79-34-5 TO-15 µg/m3 0.048 0.21 1.61 7.05
1,1,1,2-TETRACHLOROETHANE 630-20-6 TO-15 µg/m3 0.38 1.7 12.6 55.2
TETRACHLOROETHENE 127-18-4 TO-15 µg/m3 11 47 360 1570
TOLUENE 108-88-3 TO-15 µg/m3 5200 22000 174000 730000
1,2,4-TRICHLOROBENZENE 120-82-1 TO-15 µg/m3 2.1 8.8 69.5 292
Lab Sample ID
Client Sample ID
Date Collected
Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL
2.7 0.32 0.68 0.32 0.71 0.32 0.74 0.32 0.49 0.32 ND 0.6 ND 0.6
ND 0.68 ND 0.68 ND 0.68 ND 0.68 ND 0.68 ND 2.7 ND 2.7
ND 1.0 ND 1.0 ND 1.0 ND 1.0 ND 1.0 ND 4.2 ND 4.2
ND 0.39 ND 0.39 ND 0.39 ND 0.39 ND 0.39 ND 1.6 ND 1.6
ND 0.32 ND 0.32 ND 0.32 ND 0.32 ND 0.32 ND 1.3 ND 1.3
ND 0.64 ND 0.64 ND 0.64 ND 0.64 ND 0.64 ND 1.3 ND 1.3
ND 0.47 ND 0.47 ND 0.47 ND 0.47 ND 0.47 ND 1.9 ND 1.9
ND 0.27 ND 0.27 ND 0.27 ND 0.27 ND 0.27 ND 1.6 ND 1.6
0.79 0.25 0.84 0.25 ND 0.25 ND 0.25 ND 0.25 ND 1.0 ND 1.0
1.7 0.21 1.5 0.21 1.3 0.21 1.4 0.21 1.6 0.21 ND 0.8 ND 0.8
ND 1.7 ND 1.7 ND 1.7 ND 1.7 ND 1.7 ND 3.5 ND 3.5
ND 0.78 ND 0.78 ND 0.78 ND 0.78 ND 0.78 ND 3.1 ND 3.1
ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 2.4 ND 2.4
ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 2.4 ND 2.4
ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 0.61 ND 2.4 ND 2.4
ND 0.41 ND 0.41 ND 0.41 ND 0.41 ND 0.41 ND 1.6 ND 1.6
ND 0.41 ND 0.41 ND 0.41 ND 0.41 ND 0.41 ND 1.6 ND 1.6
ND 0.40 ND 0.40 ND 0.40 ND 0.40 ND 0.40 ND 1.6 ND 1.6
ND 0.40 ND 0.40 ND 0.40 ND 0.40 ND 0.40 ND 1.6 ND 1.6
ND 0.40 ND 0.40 ND 0.40 ND 0.40 ND 0.40 ND 1.6 ND 1.6
ND 0.47 ND 0.47 ND 0.47 ND 0.47 ND 0.47 ND 1.9 ND 1.9
ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 1.8 ND 1.8
ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 0.46 ND 1.8 ND 1.8
ND 0.71 ND 0.71 ND 0.71 ND 0.71 ND 0.71 ND 2.8 ND 2.8
0.88 0.44 ND 0.44 ND 0.44 ND 0.44 ND 0.44 ND 1.8 ND 1.8
ND 0.50 ND 0.50 ND 0.50 ND 0.50 ND 0.50 ND 2.0 ND 2.0
1.3 0.56 1.3 0.56 1.4 0.56 1.4 0.56 1.1 0.56 ND 2.3 ND 2.3
ND 1.0 1.2 1.0 1.3 1.0 1.2 1.0 1.4 1.0 ND 4.0 ND 4.0
ND 0.77 ND 0.77 ND 0.77 ND 0.77 ND 0.77 ND 3.1 ND 3.1
ND 2.7 ND 2.7 ND 2.7 ND 2.7 ND 2.7 ND 11 ND 11
0.39 0.35 0.46 0.35 0.39 0.35 0.42 0.35 0.39 0.35 ND 1.4 ND 1.4
ND 0.83 ND 0.83 ND 0.83 ND 0.83 ND 0.83 ND 3.3 ND 3.3
1.9 0.60 0.63 0.60 ND 0.60 ND 0.60 ND 0.60 ND 2.4 ND 2.4
ND 0.83 ND 0.83 ND 0.83 ND 0.83 ND 0.83 ND 3.3 ND 3.3
ND 0.43 ND 0.43 ND 0.43 ND 0.43 ND 0.43 ND 1.7 ND 1.7
ND 0.70 ND 0.70 ND 0.70 ND 0.70 ND 0.70 ND 2.8 ND 2.8
ND 0.70 ND 0.70 ND 0.70 ND 0.70 ND 0.70 ND 2.8 ND 2.8
ND 0.69 ND 0.69 ND 0.69 ND 0.69 ND 0.69 ND 2.8 ND 2.8
4.6 0.76 1.4 0.76 0.92 0.76 1.6 0.76 ND 0.76 ND 3.1 ND 3.1
ND 1.9 ND 1.9 ND 1.9 ND 1.9 ND 1.9 ND 7.5 ND 7.5
VP-2
E412068-01 E412068-02 E412068-03 E412068-04 E412068-05
Compared to RSLs Compared to VISLs
12/10/2024 12/10/202412/11/2024 12/11/2024 12/11/2024 12/11/2024 12/11/2024
E412068-06 E412068-07
IA-1 IA-2 IA-4 IA-5 OA-1 VP-1
Page 7 of 8
Table 1 - VOCs in Indoor Air, Outdoor Air, and Soil Gas
Brent Redd Property, 148 East Center Street, Monticello, Utah
Terracon Project No. AL067003, Task GZQ-59
Analyte CAS Method Units
EPA
Residential
Air RSL
EPA
Industrial
Air RSL
EPA VISL
Residential
EPA VISL
Commercial
Lab Sample ID
Client Sample ID
Date Collected
1,1,1-TRICHLOROETHANE 71-55-6 TO-15 µg/m3 5200 22000 174000 730000
1,1,2-TRICHLOROETHANE 79-00-5 TO-15 µg/m3 0.18 0.77 5.85 25.6
TRICHLOROETHENE 79-01-6 TO-15 µg/m3 0.48 3 15.9 99.7
1,2,4-TRIMETHYLBENZENE 95-63-6 TO-15 µg/m3 63 260 2090 8760
1,3,5-TRIMETHYLBENZENE 108-67-8 TO-15 µg/m3 63 260 2090 8760
VINYL CHLORIDE 75-01-4 TO-15 µg/m3 NE NE 5.59 92.9
M,P-XYLENE 178601-23-1 TO-15 µg/m3 NE NE NE NE
O-XYLENE 95-47-6 TO-15 µg/m3 NE NE 3480 14600
EPA VISL: Environmental Protection Agency Target Sub-Slab and Near-source Soil Gas Concentration (TSSNSGC) Vapor
Intrusion Screening Level (Downloaded from EPA website January 14, 2025, TR=1E-06; THQ=1.0).
https://www.epa.gov/vaporintrusion/vapor-intrusion-screening-level-calculator
EPA RSL:Environmental Protection Agency Regional Screening Levels for Residential and Industrial Air (November 2024,
TR=1E-06; THQ=1.0). https://www.epa.gov/risk/regional-screening-levels-rsls-generic-tables
Qualifiers (Q):
NE:Not established. ND: Not detected at or above the Reporting Detection Limit (RDL).µg/m3:micrograms per cubic
meter.Bold values exceed the RDL. Blue italicized non-detect results have RDLs exceeding one or more of the EPA RSLs or
VISLs, as applicable.
Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL Result RDL
VP-2
E412068-01 E412068-02 E412068-03 E412068-04 E412068-05
Compared to RSLs Compared to VISLs
12/10/2024 12/10/202412/11/2024 12/11/2024 12/11/2024 12/11/2024 12/11/2024
E412068-06 E412068-07
IA-1 IA-2 IA-4 IA-5 OA-1 VP-1
ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 2.2 ND 2.2
ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 2.2 ND 2.2
ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 0.55 ND 2.2 ND 2.2
1.5 0.50 ND 0.50 ND 0.50 ND 0.50 ND 0.50 ND 2.0 ND 2.0
ND 0.50 ND 0.50 ND 0.50 ND 0.50 ND 0.50 ND 2.0 ND 2.0
ND 0.13 ND 0.13 ND 0.13 ND 0.13 ND 0.13 ND 0.5 ND 0.5
2.9 0.44 0.84 0.44 ND 0.44 0.44 0.44 ND 0.44 ND 1.8 ND 1.8
1.7 0.44 ND 0.44 ND 0.44 ND 0.44 ND 0.44 ND 1.8 ND 1.8
Page 8 of 8
Appendix C
Chain of Custody Documentation
and Laboratory Report
Terracon - Midvale
Midvale, UT 84047
6952 S. High Tech Drive, Suite B
Amy Austin
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 17-Dec-24 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,
23 December 2024
Lisa Eminhizer
Laboratory Director
H&P Mobile Geochemistry, Inc. is accredited under the National Laboratory Accreditation Program (NELAP) and the Department of Defense
Environmental Laboratory Accreditation Program (DoD-ELAP), operating in accordance with international standard ISO/IEC 17025:2005 for the
fields of proficiency and analytes listed on the applicable certificates. The certificates for EPA Method TO -15 and H&P Method 8260SV (modified
EPA 8260B) can be found at www.handpmg.com, including accreditation certificate numbers, expiration of certificates, and scope of accreditation
including matrix of accreditation. Vehicle Identification Numbers are included on the certifications for mobile lab analysis , if applicable. 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: DERR Brent Redd / #AL067003
H&P Project: TER121724-14
Dear Amy Austin:
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, CAQuality. Accuracy. Experience.
Geochemistry Inc.
Mobile
Page 1 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
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
IA-1 E412068-01 Air 11-Dec-24 17-Dec-24
IA-2 E412068-02 Air 11-Dec-24 17-Dec-24
IA-4 E412068-03 Air 11-Dec-24 17-Dec-24
IA-5 E412068-04 Air 11-Dec-24 17-Dec-24
OA-1 E412068-05 Air 11-Dec-24 17-Dec-24
VP-1 E412068-06 Vapor 10-Dec-24 17-Dec-24
VP-2 E412068-07 Vapor 10-Dec-24 17-Dec-24
Page 2 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
DETECTIONS SUMMARY
Sample ID:Laboratory ID:
Analyte Result Limit Units Method
E412068-01IA-1
Notes
Reporting
Chloromethane 1.7 0.21 ug/m3 EPA TO-15
Trichlorofluoromethane (F11)1.3 0.56 ug/m3 EPA TO-15
Methylene chloride (Dichloromethane)0.39 0.35 ug/m3 EPA TO-15
2-Butanone (MEK)1.9 0.60 ug/m3 EPA TO-15
Chloroform 0.79 0.25 ug/m3 EPA TO-15
Benzene 2.7 0.32 ug/m3 EPA TO-15
Toluene 4.6 0.76 ug/m3 EPA TO-15
Ethylbenzene 0.88 0.44 ug/m3 EPA TO-15
m,p-Xylene 2.9 0.44 ug/m3 EPA TO-15
o-Xylene 1.7 0.44 ug/m3 EPA TO-15
1,2,4-Trimethylbenzene 1.5 0.50 ug/m3 EPA TO-15
Sample ID:Laboratory ID:
Analyte Result Limit Units Method
E412068-02IA-2
Notes
Reporting
Dichlorodifluoromethane (F12)1.2 1.0 ug/m3 EPA TO-15
Chloromethane 1.5 0.21 ug/m3 EPA TO-15
Trichlorofluoromethane (F11)1.3 0.56 ug/m3 EPA TO-15
Methylene chloride (Dichloromethane)0.46 0.35 ug/m3 EPA TO-15
2-Butanone (MEK)0.63 0.60 ug/m3 EPA TO-15
Chloroform 0.84 0.25 ug/m3 EPA TO-15
Benzene 0.68 0.32 ug/m3 EPA TO-15
Toluene 1.4 0.76 ug/m3 EPA TO-15
m,p-Xylene 0.84 0.44 ug/m3 EPA TO-15
Sample ID:Laboratory ID:
Analyte Result Limit Units Method
E412068-03IA-4
Notes
Reporting
Dichlorodifluoromethane (F12)1.3 1.0 ug/m3 EPA TO-15
Chloromethane 1.3 0.21 ug/m3 EPA TO-15
Trichlorofluoromethane (F11)1.4 0.56 ug/m3 EPA TO-15
Methylene chloride (Dichloromethane)0.39 0.35 ug/m3 EPA TO-15
Benzene 0.71 0.32 ug/m3 EPA TO-15
Toluene 0.92 0.76 ug/m3 EPA TO-15
Page 3 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
Sample ID:Laboratory ID:
Analyte Result Limit Units Method
E412068-04IA-5
Notes
Reporting
Dichlorodifluoromethane (F12)1.2 1.0 ug/m3 EPA TO-15
Chloromethane 1.4 0.21 ug/m3 EPA TO-15
Trichlorofluoromethane (F11)1.4 0.56 ug/m3 EPA TO-15
Methylene chloride (Dichloromethane)0.42 0.35 ug/m3 EPA TO-15
Benzene 0.74 0.32 ug/m3 EPA TO-15
Toluene 1.6 0.76 ug/m3 EPA TO-15
m,p-Xylene 0.44 0.44 ug/m3 EPA TO-15
Sample ID:Laboratory ID:
Analyte Result Limit Units Method
E412068-05OA-1
Notes
Reporting
Dichlorodifluoromethane (F12)1.4 1.0 ug/m3 EPA TO-15
Chloromethane 1.6 0.21 ug/m3 EPA TO-15
Trichlorofluoromethane (F11)1.1 0.56 ug/m3 EPA TO-15
Methylene chloride (Dichloromethane)0.39 0.35 ug/m3 EPA TO-15
Benzene 0.49 0.32 ug/m3 EPA TO-15
Sample ID:Laboratory ID:
Analyte Result Limit Units Method
E412068-06VP-1
Notes
Reporting
No Detections Reported
Sample ID:Laboratory ID:
Analyte Result Limit Units Method
E412068-07VP-2
Notes
Reporting
No Detections Reported
Page 4 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15
H&P Mobile Geochemistry, Inc.
Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
IA-1 (E412068-01) Air Sampled: 11-Dec-24 Received: 17-Dec-24
EPA TO-1520-Dec-24 20-Dec-24ug/m3 EL420041Dichlorodifluoromethane (F12)1.0ND
"""""Chloromethane "0.211.7
""""""Dichlorotetrafluoroethane (F114)0.71ND
""""""Vinyl chloride 0.13ND
""""""Bromomethane 0.39ND
""""""Chloroethane 0.27ND
"""""Trichlorofluoromethane (F11)"0.561.3
""""""1,1-Dichloroethene 0.40ND
""""""1,1,2-Trichlorotrifluoroethane (F113)0.77ND
"""""Methylene chloride (Dichloromethane)"0.350.39
""""""Carbon disulfide 0.32ND
""""""trans-1,2-Dichloroethene 0.40ND
""""""1,1-Dichloroethane 0.41ND
"""""2-Butanone (MEK)"0.601.9
""""""cis-1,2-Dichloroethene 0.40ND
"""""Chloroform "0.250.79
""""""1,1,1-Trichloroethane 0.55ND
""""""1,2-Dichloroethane (EDC)0.41ND
"""""Benzene "0.322.7
""""""Carbon tetrachloride 0.64ND
""""""Trichloroethene 0.55ND
""""""1,2-Dichloropropane 0.47ND
""""""Bromodichloromethane 0.68ND
""""""cis-1,3-Dichloropropene 0.46ND
""""""4-Methyl-2-pentanone (MIBK)0.83ND
""""""trans-1,3-Dichloropropene 0.46ND
"""""Toluene "0.764.6
""""""1,1,2-Trichloroethane 0.55ND
""""""2-Hexanone (MBK)0.83ND
""""""Dibromochloromethane 1.7ND
""""""Tetrachloroethene 0.69ND
""""""1,2-Dibromoethane (EDB)0.78ND
""""""1,1,1,2-Tetrachloroethane 0.70ND
""""""Chlorobenzene 0.47ND
"""""Ethylbenzene "0.440.88
"""""m,p-Xylene "0.442.9
""""""Styrene 0.43ND
"""""o-Xylene "0.441.7
Page 5 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15
H&P Mobile Geochemistry, Inc.
Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
IA-1 (E412068-01) Air Sampled: 11-Dec-24 Received: 17-Dec-24
EPA TO-1520-Dec-24 20-Dec-24ug/m3 EL420041Bromoform1.0ND
""""""1,1,2,2-Tetrachloroethane 0.70ND
""""""4-Ethyltoluene 0.50ND
""""""1,3,5-Trimethylbenzene 0.50ND
"""""1,2,4-Trimethylbenzene "0.501.5
""""""1,3-Dichlorobenzene 0.61ND
""""""1,4-Dichlorobenzene 0.61ND
""""""1,2-Dichlorobenzene 0.61ND
""""""1,2,4-Trichlorobenzene 1.9ND
""""""Hexachlorobutadiene 2.7ND
""""103 %76-134Surrogate: 1,2-Dichloroethane-d4
""""108 %78-125Surrogate: Toluene-d8
""""98.3 %77-127Surrogate: 4-Bromofluorobenzene
IA-2 (E412068-02) Air Sampled: 11-Dec-24 Received: 17-Dec-24
EL42004 20-Dec-24 20-Dec-24ug/m3 1Dichlorodifluoromethane (F12)EPA TO-151.01.2
"""""Chloromethane "0.211.5
""""""Dichlorotetrafluoroethane (F114)0.71ND
""""""Vinyl chloride 0.13ND
""""""Bromomethane 0.39ND
""""""Chloroethane 0.27ND
"""""Trichlorofluoromethane (F11)"0.561.3
""""""1,1-Dichloroethene 0.40ND
""""""1,1,2-Trichlorotrifluoroethane (F113)0.77ND
"""""Methylene chloride (Dichloromethane)"0.350.46
""""""Carbon disulfide 0.32ND
""""""trans-1,2-Dichloroethene 0.40ND
""""""1,1-Dichloroethane 0.41ND
"""""2-Butanone (MEK)"0.600.63
""""""cis-1,2-Dichloroethene 0.40ND
"""""Chloroform "0.250.84
""""""1,1,1-Trichloroethane 0.55ND
""""""1,2-Dichloroethane (EDC)0.41ND
"""""Benzene "0.320.68
""""""Carbon tetrachloride 0.64ND
""""""Trichloroethene 0.55ND
""""""1,2-Dichloropropane 0.47ND
Page 6 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15
H&P Mobile Geochemistry, Inc.
Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
IA-2 (E412068-02) Air Sampled: 11-Dec-24 Received: 17-Dec-24
EPA TO-1520-Dec-24 20-Dec-24ug/m3 EL420041Bromodichloromethane0.68ND
""""""cis-1,3-Dichloropropene 0.46ND
""""""4-Methyl-2-pentanone (MIBK)0.83ND
""""""trans-1,3-Dichloropropene 0.46ND
"""""Toluene "0.761.4
""""""1,1,2-Trichloroethane 0.55ND
""""""2-Hexanone (MBK)0.83ND
""""""Dibromochloromethane 1.7ND
""""""Tetrachloroethene 0.69ND
""""""1,2-Dibromoethane (EDB)0.78ND
""""""1,1,1,2-Tetrachloroethane 0.70ND
""""""Chlorobenzene 0.47ND
""""""Ethylbenzene 0.44ND
"""""m,p-Xylene "0.440.84
""""""Styrene 0.43ND
""""""o-Xylene 0.44ND
""""""Bromoform 1.0ND
""""""1,1,2,2-Tetrachloroethane 0.70ND
""""""4-Ethyltoluene 0.50ND
""""""1,3,5-Trimethylbenzene 0.50ND
""""""1,2,4-Trimethylbenzene 0.50ND
""""""1,3-Dichlorobenzene 0.61ND
""""""1,4-Dichlorobenzene 0.61ND
""""""1,2-Dichlorobenzene 0.61ND
""""""1,2,4-Trichlorobenzene 1.9ND
""""""Hexachlorobutadiene 2.7ND
""""103 %76-134Surrogate: 1,2-Dichloroethane-d4
""""110 %78-125Surrogate: Toluene-d8
""""98.7 %77-127Surrogate: 4-Bromofluorobenzene
Page 7 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15
H&P Mobile Geochemistry, Inc.
Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
IA-4 (E412068-03) Air Sampled: 11-Dec-24 Received: 17-Dec-24
EL42004 20-Dec-24 20-Dec-24ug/m3 1Dichlorodifluoromethane (F12)EPA TO-151.01.3
"""""Chloromethane "0.211.3
""""""Dichlorotetrafluoroethane (F114)0.71ND
""""""Vinyl chloride 0.13ND
""""""Bromomethane 0.39ND
""""""Chloroethane 0.27ND
"""""Trichlorofluoromethane (F11)"0.561.4
""""""1,1-Dichloroethene 0.40ND
""""""1,1,2-Trichlorotrifluoroethane (F113)0.77ND
"""""Methylene chloride (Dichloromethane)"0.350.39
""""""Carbon disulfide 0.32ND
""""""trans-1,2-Dichloroethene 0.40ND
""""""1,1-Dichloroethane 0.41ND
""""""2-Butanone (MEK)0.60ND
""""""cis-1,2-Dichloroethene 0.40ND
""""""Chloroform 0.25ND
""""""1,1,1-Trichloroethane 0.55ND
""""""1,2-Dichloroethane (EDC)0.41ND
"""""Benzene "0.320.71
""""""Carbon tetrachloride 0.64ND
""""""Trichloroethene 0.55ND
""""""1,2-Dichloropropane 0.47ND
""""""Bromodichloromethane 0.68ND
""""""cis-1,3-Dichloropropene 0.46ND
""""""4-Methyl-2-pentanone (MIBK)0.83ND
""""""trans-1,3-Dichloropropene 0.46ND
"""""Toluene "0.760.92
""""""1,1,2-Trichloroethane 0.55ND
""""""2-Hexanone (MBK)0.83ND
""""""Dibromochloromethane 1.7ND
""""""Tetrachloroethene 0.69ND
""""""1,2-Dibromoethane (EDB)0.78ND
""""""1,1,1,2-Tetrachloroethane 0.70ND
""""""Chlorobenzene 0.47ND
""""""Ethylbenzene 0.44ND
""""""m,p-Xylene 0.44ND
""""""Styrene 0.43ND
""""""o-Xylene 0.44ND
Page 8 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15
H&P Mobile Geochemistry, Inc.
Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
IA-4 (E412068-03) Air Sampled: 11-Dec-24 Received: 17-Dec-24
EPA TO-1520-Dec-24 20-Dec-24ug/m3 EL420041Bromoform1.0ND
""""""1,1,2,2-Tetrachloroethane 0.70ND
""""""4-Ethyltoluene 0.50ND
""""""1,3,5-Trimethylbenzene 0.50ND
""""""1,2,4-Trimethylbenzene 0.50ND
""""""1,3-Dichlorobenzene 0.61ND
""""""1,4-Dichlorobenzene 0.61ND
""""""1,2-Dichlorobenzene 0.61ND
""""""1,2,4-Trichlorobenzene 1.9ND
""""""Hexachlorobutadiene 2.7ND
""""104 %76-134Surrogate: 1,2-Dichloroethane-d4
""""112 %78-125Surrogate: Toluene-d8
""""97.7 %77-127Surrogate: 4-Bromofluorobenzene
IA-5 (E412068-04) Air Sampled: 11-Dec-24 Received: 17-Dec-24
EL42004 20-Dec-24 20-Dec-24ug/m3 1Dichlorodifluoromethane (F12)EPA TO-151.01.2
"""""Chloromethane "0.211.4
""""""Dichlorotetrafluoroethane (F114)0.71ND
""""""Vinyl chloride 0.13ND
""""""Bromomethane 0.39ND
""""""Chloroethane 0.27ND
"""""Trichlorofluoromethane (F11)"0.561.4
""""""1,1-Dichloroethene 0.40ND
""""""1,1,2-Trichlorotrifluoroethane (F113)0.77ND
"""""Methylene chloride (Dichloromethane)"0.350.42
""""""Carbon disulfide 0.32ND
""""""trans-1,2-Dichloroethene 0.40ND
""""""1,1-Dichloroethane 0.41ND
""""""2-Butanone (MEK)0.60ND
""""""cis-1,2-Dichloroethene 0.40ND
""""""Chloroform 0.25ND
""""""1,1,1-Trichloroethane 0.55ND
""""""1,2-Dichloroethane (EDC)0.41ND
"""""Benzene "0.320.74
""""""Carbon tetrachloride 0.64ND
""""""Trichloroethene 0.55ND
""""""1,2-Dichloropropane 0.47ND
Page 9 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15
H&P Mobile Geochemistry, Inc.
Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
IA-5 (E412068-04) Air Sampled: 11-Dec-24 Received: 17-Dec-24
EPA TO-1520-Dec-24 20-Dec-24ug/m3 EL420041Bromodichloromethane0.68ND
""""""cis-1,3-Dichloropropene 0.46ND
""""""4-Methyl-2-pentanone (MIBK)0.83ND
""""""trans-1,3-Dichloropropene 0.46ND
"""""Toluene "0.761.6
""""""1,1,2-Trichloroethane 0.55ND
""""""2-Hexanone (MBK)0.83ND
""""""Dibromochloromethane 1.7ND
""""""Tetrachloroethene 0.69ND
""""""1,2-Dibromoethane (EDB)0.78ND
""""""1,1,1,2-Tetrachloroethane 0.70ND
""""""Chlorobenzene 0.47ND
""""""Ethylbenzene 0.44ND
"""""m,p-Xylene "0.440.44
""""""Styrene 0.43ND
""""""o-Xylene 0.44ND
""""""Bromoform 1.0ND
""""""1,1,2,2-Tetrachloroethane 0.70ND
""""""4-Ethyltoluene 0.50ND
""""""1,3,5-Trimethylbenzene 0.50ND
""""""1,2,4-Trimethylbenzene 0.50ND
""""""1,3-Dichlorobenzene 0.61ND
""""""1,4-Dichlorobenzene 0.61ND
""""""1,2-Dichlorobenzene 0.61ND
""""""1,2,4-Trichlorobenzene 1.9ND
""""""Hexachlorobutadiene 2.7ND
""""103 %76-134Surrogate: 1,2-Dichloroethane-d4
""""113 %78-125Surrogate: Toluene-d8
""""99.4 %77-127Surrogate: 4-Bromofluorobenzene
Page 10 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15
H&P Mobile Geochemistry, Inc.
Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
OA-1 (E412068-05) Air Sampled: 11-Dec-24 Received: 17-Dec-24
EL42004 20-Dec-24 20-Dec-24ug/m3 1Dichlorodifluoromethane (F12)EPA TO-151.01.4
"""""Chloromethane "0.211.6
""""""Dichlorotetrafluoroethane (F114)0.71ND
""""""Vinyl chloride 0.13ND
""""""Bromomethane 0.39ND
""""""Chloroethane 0.27ND
"""""Trichlorofluoromethane (F11)"0.561.1
""""""1,1-Dichloroethene 0.40ND
""""""1,1,2-Trichlorotrifluoroethane (F113)0.77ND
"""""Methylene chloride (Dichloromethane)"0.350.39
""""""Carbon disulfide 0.32ND
""""""trans-1,2-Dichloroethene 0.40ND
""""""1,1-Dichloroethane 0.41ND
""""""2-Butanone (MEK)0.60ND
""""""cis-1,2-Dichloroethene 0.40ND
""""""Chloroform 0.25ND
""""""1,1,1-Trichloroethane 0.55ND
""""""1,2-Dichloroethane (EDC)0.41ND
"""""Benzene "0.320.49
""""""Carbon tetrachloride 0.64ND
""""""Trichloroethene 0.55ND
""""""1,2-Dichloropropane 0.47ND
""""""Bromodichloromethane 0.68ND
""""""cis-1,3-Dichloropropene 0.46ND
""""""4-Methyl-2-pentanone (MIBK)0.83ND
""""""trans-1,3-Dichloropropene 0.46ND
""""""Toluene 0.76ND
""""""1,1,2-Trichloroethane 0.55ND
""""""2-Hexanone (MBK)0.83ND
""""""Dibromochloromethane 1.7ND
""""""Tetrachloroethene 0.69ND
""""""1,2-Dibromoethane (EDB)0.78ND
""""""1,1,1,2-Tetrachloroethane 0.70ND
""""""Chlorobenzene 0.47ND
""""""Ethylbenzene 0.44ND
""""""m,p-Xylene 0.44ND
""""""Styrene 0.43ND
""""""o-Xylene 0.44ND
Page 11 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15
H&P Mobile Geochemistry, Inc.
Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
OA-1 (E412068-05) Air Sampled: 11-Dec-24 Received: 17-Dec-24
EPA TO-1520-Dec-24 20-Dec-24ug/m3 EL420041Bromoform1.0ND
""""""1,1,2,2-Tetrachloroethane 0.70ND
""""""4-Ethyltoluene 0.50ND
""""""1,3,5-Trimethylbenzene 0.50ND
""""""1,2,4-Trimethylbenzene 0.50ND
""""""1,3-Dichlorobenzene 0.61ND
""""""1,4-Dichlorobenzene 0.61ND
""""""1,2-Dichlorobenzene 0.61ND
""""""1,2,4-Trichlorobenzene 1.9ND
""""""Hexachlorobutadiene 2.7ND
""""103 %76-134Surrogate: 1,2-Dichloroethane-d4
""""110 %78-125Surrogate: Toluene-d8
""""99.6 %77-127Surrogate: 4-Bromofluorobenzene
VP-1 (E412068-06) Vapor Sampled: 10-Dec-24 Received: 17-Dec-24
EPA TO-1520-Dec-24 20-Dec-24ug/m3 EL420041Dichlorodifluoromethane (F12)4.0ND
""""""Chloromethane 0.8ND
""""""Dichlorotetrafluoroethane (F114)2.8ND
""""""Vinyl chloride 0.5ND
""""""Bromomethane 1.6ND
""""""Chloroethane 1.6ND
""""""Trichlorofluoromethane (F11)2.3ND
""""""1,1-Dichloroethene 1.6ND
""""""1,1,2-Trichlorotrifluoroethane (F113)3.1ND
""""""Methylene chloride (Dichloromethane)1.4ND
""""""Carbon disulfide 1.3ND
""""""trans-1,2-Dichloroethene 1.6ND
""""""1,1-Dichloroethane 1.6ND
""""""2-Butanone (MEK)2.4ND
""""""cis-1,2-Dichloroethene 1.6ND
""""""Chloroform 1.0ND
""""""1,1,1-Trichloroethane 2.2ND
""""""1,2-Dichloroethane (EDC)1.6ND
""""""Benzene 0.6ND
""""""Carbon tetrachloride 1.3ND
""""""Trichloroethene 2.2ND
""""""1,2-Dichloropropane 1.9ND
Page 12 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15
H&P Mobile Geochemistry, Inc.
Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-1 (E412068-06) Vapor Sampled: 10-Dec-24 Received: 17-Dec-24
EPA TO-1520-Dec-24 20-Dec-24ug/m3 EL420041Bromodichloromethane2.7ND
""""""cis-1,3-Dichloropropene 1.8ND
""""""4-Methyl-2-pentanone (MIBK)3.3ND
""""""trans-1,3-Dichloropropene 1.8ND
""""""Toluene 3.1ND
""""""1,1,2-Trichloroethane 2.2ND
""""""2-Hexanone (MBK)3.3ND
""""""Dibromochloromethane 3.5ND
""""""Tetrachloroethene 2.8ND
""""""1,2-Dibromoethane (EDB)3.1ND
""""""1,1,1,2-Tetrachloroethane 2.8ND
""""""Chlorobenzene 1.9ND
""""""Ethylbenzene 1.8ND
""""""m,p-Xylene 1.8ND
""""""Styrene 1.7ND
""""""o-Xylene 1.8ND
""""""Bromoform 4.2ND
""""""1,1,2,2-Tetrachloroethane 2.8ND
""""""4-Ethyltoluene 2.0ND
""""""1,3,5-Trimethylbenzene 2.0ND
""""""1,2,4-Trimethylbenzene 2.0ND
""""""1,3-Dichlorobenzene 2.4ND
""""""1,4-Dichlorobenzene 2.4ND
""""""1,2-Dichlorobenzene 2.4ND
""""""1,2,4-Trichlorobenzene 7.5ND
""""""Hexachlorobutadiene 11ND
""""103 %76-134Surrogate: 1,2-Dichloroethane-d4
""""110 %78-125Surrogate: Toluene-d8
""""99.5 %77-127Surrogate: 4-Bromofluorobenzene
Page 13 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15
H&P Mobile Geochemistry, Inc.
Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-2 (E412068-07) Vapor Sampled: 10-Dec-24 Received: 17-Dec-24
EPA TO-1520-Dec-24 20-Dec-24ug/m3 EL420041Dichlorodifluoromethane (F12)4.0ND
""""""Chloromethane 0.8ND
""""""Dichlorotetrafluoroethane (F114)2.8ND
""""""Vinyl chloride 0.5ND
""""""Bromomethane 1.6ND
""""""Chloroethane 1.6ND
""""""Trichlorofluoromethane (F11)2.3ND
""""""1,1-Dichloroethene 1.6ND
""""""1,1,2-Trichlorotrifluoroethane (F113)3.1ND
""""""Methylene chloride (Dichloromethane)1.4ND
""""""Carbon disulfide 1.3ND
""""""trans-1,2-Dichloroethene 1.6ND
""""""1,1-Dichloroethane 1.6ND
""""""2-Butanone (MEK)2.4ND
""""""cis-1,2-Dichloroethene 1.6ND
""""""Chloroform 1.0ND
""""""1,1,1-Trichloroethane 2.2ND
""""""1,2-Dichloroethane (EDC)1.6ND
""""""Benzene 0.6ND
""""""Carbon tetrachloride 1.3ND
""""""Trichloroethene 2.2ND
""""""1,2-Dichloropropane 1.9ND
""""""Bromodichloromethane 2.7ND
""""""cis-1,3-Dichloropropene 1.8ND
""""""4-Methyl-2-pentanone (MIBK)3.3ND
""""""trans-1,3-Dichloropropene 1.8ND
""""""Toluene 3.1ND
""""""1,1,2-Trichloroethane 2.2ND
""""""2-Hexanone (MBK)3.3ND
""""""Dibromochloromethane 3.5ND
""""""Tetrachloroethene 2.8ND
""""""1,2-Dibromoethane (EDB)3.1ND
""""""1,1,1,2-Tetrachloroethane 2.8ND
""""""Chlorobenzene 1.9ND
""""""Ethylbenzene 1.8ND
""""""m,p-Xylene 1.8ND
""""""Styrene 1.7ND
""""""o-Xylene 1.8ND
Page 14 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15
H&P Mobile Geochemistry, Inc.
Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
VP-2 (E412068-07) Vapor Sampled: 10-Dec-24 Received: 17-Dec-24
EPA TO-1520-Dec-24 20-Dec-24ug/m3 EL420041Bromoform4.2ND
""""""1,1,2,2-Tetrachloroethane 2.8ND
""""""4-Ethyltoluene 2.0ND
""""""1,3,5-Trimethylbenzene 2.0ND
""""""1,2,4-Trimethylbenzene 2.0ND
""""""1,3-Dichlorobenzene 2.4ND
""""""1,4-Dichlorobenzene 2.4ND
""""""1,2-Dichlorobenzene 2.4ND
""""""1,2,4-Trichlorobenzene 7.5ND
""""""Hexachlorobutadiene 11ND
""""103 %76-134Surrogate: 1,2-Dichloroethane-d4
""""110 %78-125Surrogate: Toluene-d8
""""99.1 %77-127Surrogate: 4-Bromofluorobenzene
Page 15 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Limit Notes Analyte
VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15 - Quality Control
H&P Mobile Geochemistry, Inc.
Batch EL42004 - TO-15
Blank (EL42004-BLK1)Prepared & Analyzed: 20-Dec-24
Dichlorodifluoromethane (F12)ug/m31.0ND
Chloromethane "0.21ND
Dichlorotetrafluoroethane (F114)"0.71ND
Vinyl chloride "0.13ND
Bromomethane "0.39ND
Chloroethane "0.27ND
Trichlorofluoromethane (F11)"0.56ND
1,1-Dichloroethene "0.40ND
1,1,2-Trichlorotrifluoroethane (F113)"0.77ND
Methylene chloride (Dichloromethane)"0.35ND
Carbon disulfide "0.32ND
trans-1,2-Dichloroethene "0.40ND
1,1-Dichloroethane "0.41ND
2-Butanone (MEK)"0.60ND
cis-1,2-Dichloroethene "0.40ND
Chloroform "0.25ND
1,1,1-Trichloroethane "0.55ND
1,2-Dichloroethane (EDC)"0.41ND
Benzene "0.32ND
Carbon tetrachloride "0.64ND
Trichloroethene "0.55ND
1,2-Dichloropropane "0.47ND
Bromodichloromethane "0.68ND
cis-1,3-Dichloropropene "0.46ND
4-Methyl-2-pentanone (MIBK)"0.83ND
trans-1,3-Dichloropropene "0.46ND
Toluene "0.76ND
1,1,2-Trichloroethane "0.55ND
2-Hexanone (MBK)"0.83ND
Dibromochloromethane "1.7ND
Tetrachloroethene "0.69ND
1,2-Dibromoethane (EDB)"0.78ND
1,1,1,2-Tetrachloroethane "0.70ND
Chlorobenzene "0.47ND
Page 16 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Limit Notes Analyte
VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15 - Quality Control
H&P Mobile Geochemistry, Inc.
Batch EL42004 - TO-15
Blank (EL42004-BLK1)Prepared & Analyzed: 20-Dec-24
Ethylbenzene ug/m30.44ND
m,p-Xylene "0.44ND
Styrene "0.43ND
o-Xylene "0.44ND
Bromoform "1.0ND
1,1,2,2-Tetrachloroethane "0.70ND
4-Ethyltoluene "0.50ND
1,3,5-Trimethylbenzene "0.50ND
1,2,4-Trimethylbenzene "0.50ND
1,3-Dichlorobenzene "0.61ND
1,4-Dichlorobenzene "0.61ND
1,2-Dichlorobenzene "0.61ND
1,2,4-Trichlorobenzene "1.9ND
Hexachlorobutadiene "2.7ND
"214 76-134Surrogate: 1,2-Dichloroethane-d4 100214
"208 78-125Surrogate: Toluene-d8 109226
"363 77-127Surrogate: 4-Bromofluorobenzene 98.5357
LCS (EL42004-BS1)Prepared & Analyzed: 20-Dec-24
Dichlorodifluoromethane (F12)ug/m3 101 59-1281101.0111
Vinyl chloride "52.0 64-1271210.1363.1
Chloroethane "53.6 63-1271190.2763.6
Trichlorofluoromethane (F11)"113 62-1261100.56125
1,1-Dichloroethene "80.8 61-1331000.4080.9
1,1,2-Trichlorotrifluoroethane (F113)"155 66-12697.10.77151
Methylene chloride (Dichloromethane)"70.8 62-11592.30.3565.3
trans-1,2-Dichloroethene "80.8 67-12496.50.4078.0
1,1-Dichloroethane "82.4 68-12695.90.4179.0
cis-1,2-Dichloroethene "80.0 70-12197.90.4078.3
Chloroform "99.2 68-12394.50.2593.7
1,1,1-Trichloroethane "111 68-12592.90.55103
1,2-Dichloroethane (EDC)"82.4 65-12894.60.4177.9
Benzene "64.8 69-11992.90.3260.2
Page 17 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Limit Notes Analyte
VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15 - Quality Control
H&P Mobile Geochemistry, Inc.
Batch EL42004 - TO-15
LCS (EL42004-BS1)Prepared & Analyzed: 20-Dec-24
Carbon tetrachloride ug/m3 128 68-13291.90.64118
Trichloroethene "110 71-12394.30.55103
Toluene "76.8 66-11999.20.7676.2
1,1,2-Trichloroethane "111 73-11999.50.55111
Tetrachloroethene "138 66-12498.00.69135
1,1,1,2-Tetrachloroethane "140 67-12997.00.70136
Ethylbenzene "88.4 70-12495.30.4484.3
m,p-Xylene "88.4 61-13494.70.4483.8
o-Xylene "88.4 67-12586.10.4476.1
1,1,2,2-Tetrachloroethane "140 65-1271000.70140
"214 76-134Surrogate: 1,2-Dichloroethane-d4 110234
"208 78-125Surrogate: Toluene-d8 102212
"363 77-127Surrogate: 4-Bromofluorobenzene 99.4361
LCS Dup (EL42004-BSD1)Prepared & Analyzed: 20-Dec-24
Dichlorodifluoromethane (F12)ug/m3 101 2559-128111 0.9921.0112
Vinyl chloride "52.0 2564-127120 1.490.1362.2
Chloroethane "53.6 2563-127121 2.330.2765.1
Trichlorofluoromethane (F11)"113 2562-126112 1.570.56127
1,1-Dichloroethene "80.8 2561-133102 2.070.4082.6
1,1,2-Trichlorotrifluoroethane (F113)"155 2566-12698.2 1.120.77152
Methylene chloride (Dichloromethane)"70.8 2562-11594.1 1.920.3566.6
trans-1,2-Dichloroethene "80.8 2567-12497.5 0.9750.4078.8
1,1-Dichloroethane "82.4 2568-12696.7 0.8280.4179.7
cis-1,2-Dichloroethene "80.0 2570-12199.1 1.230.4079.3
Chloroform "99.2 2568-12396.3 1.930.2595.6
1,1,1-Trichloroethane "111 2568-12594.6 1.800.55105
1,2-Dichloroethane (EDC)"82.4 2565-12899.5 5.030.4182.0
Benzene "64.8 2569-11993.4 0.4820.3260.5
Carbon tetrachloride "128 2568-13295.2 3.520.64122
Trichloroethene "110 2571-12398.3 4.080.55108
Toluene "76.8 2566-119101 2.230.7677.9
1,1,2-Trichloroethane "111 2573-119102 2.220.55113
Page 18 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Limit Notes Analyte
VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15 - Quality Control
H&P Mobile Geochemistry, Inc.
Batch EL42004 - TO-15
LCS Dup (EL42004-BSD1)Prepared & Analyzed: 20-Dec-24
Tetrachloroethene ug/m3 138 2566-124100 2.270.69138
1,1,1,2-Tetrachloroethane "140 2567-12997.1 0.1030.70136
Ethylbenzene "88.4 2570-12495.5 0.2080.4484.5
m,p-Xylene "88.4 2561-13494.6 0.1580.4483.6
o-Xylene "88.4 2567-12588.1 2.340.4477.9
1,1,2,2-Tetrachloroethane "140 2565-127101 1.190.70142
"214 76-134Surrogate: 1,2-Dichloroethane-d4 110236
"208 78-125Surrogate: Toluene-d8 102213
"363 77-127Surrogate: 4-Bromofluorobenzene 98.0356
Page 19 of 20
Project:
Project Number:
Project Manager:
Reported:
Terracon - Midvale
6952 S. High Tech Drive, Suite B
TER121724-14
DERR Brent Redd / #AL067003
Amy AustinMidvale, UT 84047 23-Dec-24 15:06
2470 Impala Drive
Carlsbad, CA 92010
760-804-9678 Phone
760-804-9159 Fax
H&P Mobile
Geochemistry Inc.
Notes and Definitions
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 Testing 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 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/accreditations .
Page 20 of 20