DERR-2024-004880

Subsurface Investigation Report
Maverik #314
795 South State Street
Orem, Utah

February 6, 2024

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Subsurface Investigation Report Prepared for Maverik, Inc. | Maverik #314
Table of Contents
1. Introduction ......................................................................................................................................................1
2. Scope of Work ..................................................................................................................................................1
3. Soil Borings and Sampling ...............................................................................................................................1
4. Soil Sampling Results .......................................................................................................................................2
5. Tier 1 Assessment ............................................................................................................................................3
6. Conclusions and Recommendations ................................................................................................................4
7. References .......................................................................................................................................................5

List of Figures
Figure 1 Project Location
Figure 2 Site Location Map
List of Tables
Table 1 Summary of Soil Analytical Results
Appendices
Appendix A Soil Boring Logs
Appendix B Soil Boring Photo Logs
Appendix C Laboratory Report

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Subsurface Investigation Report Prepared for Maverik, Inc. | Maverik #314
1. Introduction
Tetra Tech, Inc. (Tetra Tech) conducted a subsurface site investigation for Maverik, Inc. (Maverik) to determine
subsurface petroleum concentrations from a reported release at the Maverik #314 convenience store (Facility
ID. 1000371, Release Site Number OIS). The Maverik store is located at 795 South State Street in Orem, Utah
(Site). The Site location and features are shown on Figures 1 and 2.
Maverik reported a release from the south dispenser located in the east dispenser island on September 7,
2023. The release was detected by internal alarms and confirmed through product line testing by CSESCO Inc..
The release size was estimated by Maverik to be less than 85 gallons of unleaded gasoline. As a result, Maverik
performed a subsurface investigation and identified impacted soils below the dispenser. Approximately 2,290
pounds of soil were excavated from below the dispenser and removed and disposed of off the property. Four
soil samples were collected from the perimeters of the excavation for laboratory analysis of benzene, toluene,
ethylbenzene, total xylenes, naphthalene (BTEXN), total petroleum hydrocarbons as gasoline range organics
(TPH-GRO) by EPA Method 8260, and total petroleum hydrocarbons as diesel range organics (TPH-DRO) by EPA
Method 8015. The response actions and results from the samples described above were presented in a report
prepared by Maverik dated September 29, 2023. In summary, three of the four soil samples collected reported
petroleum detections above the Risk-Based Corrective Action (RBCA) Tier 1 Screening Levels, which can be
applied to Utah LUST sites for evaluation and cleanup under specific geographical criteria specified by DERR. As
a result, the Utah Department of Environmental Quality, Division of Environmental Response and Remediation
(DERR) requested that additional investigative work be performed and documented in a letter dated October
26, 2023.
The Site consists of commercial property with a convenience store, underground storage tanks (USTs),
dispensers, paved drives, and parking areas. Currently, the Site is an active petroleum retail store for Maverik.
Surrounding properties consist of commercial property to the north and east, 800 South Street to the south,
and State Street to the west. Utilities around the periphery of the Maverik and serving the property are
communications, underground power, telephone, natural gas, water, and sewer. Site features, property
boundaries, and utilities are shown on Figure 2.
2. Scope of Work
The work was centered around the dispenser where the release was detected. The location was at the south
end of the east dispenser island. The investigation aimed to determine the horizontal and vertical extents of
residual petroleum hydrocarbon in soils at the Site. The scope of work performed is presented below.
• Advance two (2) soil borings to 20 feet below ground surface (bgs) at the locations shown on Figure 2.
• Collect soil samples at 5-foot intervals.
• Submit at least one soil sample per boring for laboratory analytical testing.
• Backfill the soil borings with cuttings and bentonite chips and repair the ground surface with concrete to
match the surrounding surface cover.
The activities performed and the results from these activities are presented in Sections 3 and 4.
3. Soil Borings and Sampling
The two soil borings were drilled on December 22, 2023, by Direct Push Services with observation and
oversight provided by Tetra Tech. Based on the driller’s experience in the area, dense coarse-grained soils were
expected which were expected to require ODEX drilling. The boom height of the ODEX drill rig is approximately

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Subsurface Investigation Report Prepared for Maverik, Inc. | Maverik #314
14.5 to 15 feet. At the time of drilling, it was discovered that the canopy was only 13 feet in height, not allowing
the rig below the canopy to drill adjacent to the dispenser as was originally planned. Because of the height
restriction, the two borings were relocated to the just outside the perimeter of the canopy but as close as
possible to the reported leaking dispenser.
Blue Stakes was notified before mobilization and drilling activities to protect below-ground utilities. Additionally,
before drilling, each borehole was cleared using ground penetrating radar (GPR). The soil lithologies were
logged and the soil samples were collected by Curt Stripeika, a Utah Certified Soil and Groundwater Sampler,
GS-0289. The dates and times of soil sample collection are provided on the Soil Boring Logs provided in
Appendix A.
Subsurface soil samples were collected using a split-spoon sampler at 5-foot intervals. Samples were visually
inspected and screened with a photo-ionization detector (PID), and observations of potential impacts were
recorded on the boring logs. One subsurface soil sample was collected as a grab sample from each borehole for
laboratory analysis. Samples were collected from areas of visibly impacted soils or soils showing the detection
of volatile organic vapors with the photo-ionization detector (PID). The samples were hand-delivered to
Chemtech-Ford Analytical Laboratories for analysis of the following parameters:
• BTEXN, and TPH-GRO by EPA Method 8260.
• TPH-DRO by EPA Method 8015.
All non-disposable sampling equipment was decontaminated between sample intervals using a non-phosphate
detergent wash and distilled water rinse. Decontamination liquids were then spread on the asphalt and allowed
to evaporate, Soil cuttings and bentonite chips were used to backfill each borehole. Concrete was used as the
surface completion for each borehole. The results from soil sample collection and analyses are presented in
Section 4.
The person collecting the samples was responsible for sample custody from the time of sample collection to
receipt by a laboratory or until samples were shipped. A sample is considered under custody if one of the
following conditions applies:
• The sample is in a person’s possession.
• The sample is in that person’s view after being in his or her possession.
• The sample was in that person’s possession and then placed in a secured location.
• The sample is in a designated secure area.
A Chain-of-Custody Record with its assigned sample numbers accompanied all samples to the laboratory. When
samples were shipped, custody seals were attached to each cooler to prevent tampering during transit, and the
shipment air bill became part of the Chain-of-Custody documentation.
4. Soil Sampling Results
Subsurface soils encountered within the soil borings generally consisted of approximately 1 to 1.5 feet of fill
underlain by very dense native silty, sandy, gravel (GM) to the maximum depth explored of 20.5 feet bgs.
Because of the dense and gravelly subsurface soil conditions, no samples were retrieved at the 10 and 15-foot
depths in soil boring B-2. Groundwater was not encountered in either of the boreholes. The soil borings
performed for this investigation are described herein and shown on the Soil Boring Logs in Appendix A and Soil
Boring Photo Logs in Appendix B.

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Subsurface Investigation Report Prepared for Maverik, Inc. | Maverik #314
During advancement of the soil borings, the subsurface soils at location B-1 showed a PID reading above the
background level at a maximum detection of 1.4 parts per million (ppm), for unspecific volatile organic
compounds. The depth at which this detection occurred was 15 feet.
The soil sample detections from each soil boring and sample depth are presented in Table 1. The results are
compared against the following State of Utah screening criteria:
• Soil Initial Screening Levels (ISLs) developed by DERR as conservative, preliminary evaluation criteria
for petroleum hydrocarbon constituents associated with LUST sites.
• Soil RBCA Tier 1 Screening Criteria adopted by DERR, which are less conservative than ISLs and can be
applied to LUST sites for evaluation and cleanup under specific geographical criteria specified by DERR.
All soil sample results were below laboratory detection levels, which were below the applicable screening
criteria as shown in Table 1.
5. Tier 1 Assessment
The release results were evaluated relative to the Utah RBCA Tier 1 criteria to assess possible risks to human
health or the environment. The process is used to determine potential risks posed by the release, and the
identification of possible receptors that could be impacted. Receptors include distances to the property
boundaries, identification of utilities that could be impacted, distance to surface water bodies and depth to
groundwater, soil lithology, and contamination levels relative to the Utah ISL and RBCA Tier 1 screening criteria,
The evaluation process also reviews the release mechanics, associated repairs to stop the leak, and mitigation
measures taken.
The release was detected by internal alarms and confirmation through product line testing by CSESCO. Maverik
on September 7, 2023, reported the release to the DERR. An investigation was performed and identified
impacted soils vertically beneath the dispenser. The release was caused by a corroded flex joint below the
dispenser. The failed joint was replaced, and the dispenser returned to service. The findings and response
actions were summarized in a report from Maverik dated September 29, 2023. Presented below is a
description of the release, and an inventory of receptors at the Maverik store and the immediate vicinity.
• There are no residential properties that border the property or within 700 feet. The perimeter of the
Maverik store is surrounded by commercial property and public right of ways.
• The location of the dispenser where the release originated is greater than 60 feet from any property
boundary or periphery utility receptor. The sanitary sewer and water line laterals servicing the store were
located east of the USTs and canopy. The actual location of the two laterals was not located in the field
but inferred. The borings were located south and east of the leaking dispenser at the edges of the
canopy and the dispenser is a minimum of 30 feet from either the water or sewer lateral.
• The release size was conservatively reported to be less than 85 gallons of unleaded gasoline.
Approximately 2,920 pounds of impacted soil and non-impacted soil were removed from beneath and
around the defective dispenser in an effort to remove source material from the release. Soils were hand
excavated to a depth of 5 feet. Soil was disposed of at the E.T. Technologies Soils Regeneration Site in
Salt Lake County, Utah.
• A previous release occurred at the Maverik store in 2006 and was detected from the west side
dispenser island on July 20, 2006, and reported to the DERR on July 21, 2006. Maverik drilled two soil
borings to 20 feet to evaluate impacts to soil near the dispenser and one boring to 80 feet to determine
impacts to groundwater. Groundwater was encountered at a depth of 71 feet bgs. Neither soil nor
groundwater were impacted.

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Subsurface Investigation Report Prepared for Maverik, Inc. | Maverik #314
• There are no surface water bodies on the property or on adjacent lands.
Based on this evaluation, the RBCA Tier 1 Screening Criteria are considered applicable to the Site as defined by
the DERR.
6. Conclusions and Recommendations
Based on the findings presented in this report, Tetra Tech recommends that the release be closed, and a no
further action status be granted. To support this recommendation, the following summary of results is
presented.
• All located utilities are greater than 30 feet from the leaking dispenser. Utilities at the property and
adjacent property have not been impacted.
• Distances to the property boundaries are greater than 30 feet from the release location.
• The depth to groundwater at the site was determined to be approximately 70 feet. The previous release
did not report any impacts to groundwater. It seems unlikely groundwater was impacted by the current
release based on the lack of shallow soil detections in the vicinity of the dispenser.
• There are no surface water bodies on the property nor on adjacent lands.
• Approximately 2,920 pounds of soil were removed from beneath the leaking dispenser. The location of
the release was below an operating dispenser. Further soil removal at that location is unfeasible.
• Soils to a depth of 20 feet bgs in borings B-1 and B-2 show no petroleum impacts.
• The leak flex joint below the dispenser was quickly repaired, limiting the size of the release to an
estimated volume of 85 gallons or less.
• The previous release was caused by a corroded flex connector. The current release was also a result of
a failed corroded flex connector. Both releases were detected within 24 hours and immediate action
was taken to stop the leak and correct the problem. Based on the type of failure of both releases, the
estimated duration of the releases, and the expediency of corrective actions taken, the two releases
seem to be similar and likely of similar size. The previous release was closed in 2010 and was based on
investigative findings in a report submitted to DERR in 2007 that did not find impacts to soil and
groundwater. Assuming the releases are both similar, it seems unlikely that groundwater was impacted
at the site.
If you have questions about this report or would like additional information, please contact us.
Respectfully submitted,
Tetra Tech, Inc.

Curt Stripeika, CC-0003 David Wilson, P.E., P.G.
Senior Project Manager Principal Engineer
[e-mail] [e-mail]
Cell 801.520.5029 Cell 801.916.6957

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Subsurface Investigation Report Prepared for Maverik, Inc. | Maverik #314
7. References
Initial Site and Subsurface Investigation Report, Maverik, September 29, 2023.
No Further Action, Leaking Underground Storage Tank Release, Facility ID 1000371, Release ID MCN, DERR,
May 26, 2010.
Subsurface Investigation Reporting Requirements, Facility ID 1000371, Release ID MCN, DERR, October 26,
2023.

Well Installation and Groundwater Monitoring Report, Maverik, February 8, 2008.

_6460564.1
Figures

OREM, UTAH
MAVERIK STORE #314
DATE PREPARED: 01-10-2024
FIGURE 2
TETRA TECH 4750 WEST 2100 SOUTHSUITE 400
SALT LAKE CITY, UTAH 84120
INITIAL SITE INVESTIGATION
Site Map and Boring Locations
CC Po
l
e
C
P
P
P
W
W
W
W
G Meter
M
e
t
e
r
G
G
G
light pole
B-1
B-2
W water - blue
P power - red
G gas - yellow
C communications - orange
Soil Borings
Figure courtesy of Maverik, Inc

_6460564.1

Tables

B-1 @ 15FT B-2 @ 20FT
12/22/2023 12/22/2023
Method Analyte Units Result Result
8260B TPH (GC/FID) LOW FRACTION mg/kg 150 1,500 <0.229 <0.248
8260B BENZENE mg/kg 0.2 0.9 <0.009 <0.01
8260B TOLUENE mg/kg 9 25 <0.02 <0.02
8260B ETHYLBENZENE mg/kg 6 23 <0.02 <0.02
8260B XYLENES, TOTAL mg/kg 142 142 <0.02 <0.02
8260B NAPHTHALENE mg/kg 51 51 <0.02 <0.02
8260B METHYL TERT-BUTYL ETHER (MTBE)mg/kg 0.3 0.3 <0.009 <0.01
8015 TPH (GC/FID) HIGH FRACTION mg/kg 500 5,000 <50 <50
Notes Results in bold are above laboratory detection levels
< = Below laboratory detection levels
mg/kg = milligram/kilogram
Table 1
Utah Initial
Screening Level
(ISL)
Utah Tier 1
Screening Level
Maverik #314
795 South State Street, Orem, UT
Facility ID 100037, Release ID OIS
Date Collected
Client Sample ID
Summary of Soil Analytical Results

_6460564.1

Appendix A
Soil Boring Logs

Maverik #314
Soil Bonig12 B
Date Started: 12/22/23 Date Completed: 12/22/23 Location
Accuracy:
Client Name: Maaverik, Inc.Checked By: David Wilson Driller: Curt Stripeika
Drilling Firm: Direct Push Services Hammer Type: Auto Hammer Weight: 150
Logged By: Curt Stripeika Method: Air Rotary Depth: 21'
Rig Type: Geoprobe 7822DT Tooling: Rotary Drill Surface
Elevation: 4780'
Water Level At
Time Of Drilling: N/A Water Level After
Drilling: N/A
De
p
t
h

(
f
t
)
5
10
15
20
El
e
v
a
t
i
o
n

(
f
t
)
Wa
t
e
r

L
e
v
e
l
s
US
C
S
GW
GM
Gr
a
p
h
i
c

L
o
g
PI
D
0
0
1.4
0
Visual Classification and Remarks
0.3
1.0
End of Boring
20.5
CONCRETE
FILL, WELLYGRADED GRAVEL ;GW<
Very dense, SILT= GRAVEL ;GM<
Sample collected BY1 15ft >12?10
Maverik #314
Soil Bonig12 B

Date Started: 12/22/23 Date Completed: 12/22/23 Location
Accuracy:
Client Name: Maaverik, Inc.Checked By: David Wilson Driller: Curt Stripeika
Drilling Firm: Direct Push Services Hammer Type: Auto Hammer Weight: 150
Logged By: Curt Stripeika Method: Air Rotary Rig Type: Geoprobe 7822DT
Tooling: Rotary Drill Surface
Elevation: N/A Water Level At
Time Of Drilling: N/A
Water Level After
Drilling: N/A
De
p
t
h

(
f
t
)
5
10
15
20
El
e
v
a
t
i
o
n

(
f
t
)
Wa
t
e
r

L
e
v
e
l
s
US
C
S
GW
GM
Gr
a
p
h
i
c

L
o
g
PI
D
0
0
0
0
Visual Classification and Remarks
0.3
1.5
End of Boring
20.5
CONCRETE
FILL, WELLYGRADED GRAVEL ;GW<
Very dense, SILT= GRAVEL ;GM<
Sample collected BY2 20ft >15?30

_6460564.1

Appendix B
Soil Boring Photo Log
Soil boring B-1, sample 5 feet
Soil boring B-1, sample @ 10 feet
Soil boring B-1 sample @ 15 feet
Soil boring B-1, sample @ 20 feet
Soil boring B-2, sample @ 5 feet
Soil boring B-2, sample @ 20 feet

_6460564.1

Appendix C
Laboratory Report
The analyses presented on this report were performed in accordance with the
National Environmental Laboratory Accreditation Program (NELAP) unless
noted in the comments, flags, or case narrative. If the report is to be used for
regulatory compliance, it should be presented in its entirety, and not be
altered.
Client Service Contact: 801.262.7299
Maverik, Inc.
Attn: Mark Stewart
185 S State Street Suite 800
Salt Lake City, UT 84111
Work Order: 23L1926
Project: Orem 314 Site Investigation
1/4/2024
Approved By:
Reed Hendricks, Lab Director
9632 South 500 West Sandy, Utah 84070
Serving the Intermountain West since 1953
801.262.7299 Main 866.792.0093 Fax www.ChemtechFord.com
Page 1 of 5
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Maverik, Inc.
Mark Stewart
185 S State Street Suite 800
Salt Lake City, UT 84111
PO#:
Receipt:
Date Reported:
Project Name:
314-7080-11
12/26/23 9:57 @ 0.3 °C
1/4/2024
Orem 314 Site Investigation
Sample ID: B-1 @ 15ft
Lab ID: 23L1926-01Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 12/22/23 12:10
Preparation
Date/Time
Sampled By: Curt Stripeika
Minimum
Reporting
Limit MethodResult
Inorganic
%12/27/2312/26/230.1 CTF800096.9Total Solids
MBTEXn
mg/kg dry 1/2/241/2/240.009 EPA 8260D/5030BNDBenzene
mg/kg dry 1/2/241/2/240.02 EPA 8260D/5030BNDEthylbenzene
mg/kg dry 1/2/241/2/240.009 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/kg dry 1/2/241/2/240.02 EPA 8260D/5030BNDNaphthalene
mg/kg dry 1/2/241/2/240.02 EPA 8260D/5030BNDToluene
mg/kg dry 1/2/241/2/240.02 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/kg dry 1/2/241/2/240.229 EPA 8260B/C 5035A/[CALC]NDGasoline Range Organics
Diesel Range
mg/kg dry 12/28/2312/28/2350EPA 8015 CNDDiesel Range Organics
Project Name: Orem 314 Site Investigation CtF WO#: 23L1926
www.ChemtechFord.com
Page 2 of 5Page 2 of 5
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Maverik, Inc.
Mark Stewart
185 S State Street Suite 800
Salt Lake City, UT 84111
PO#:
Receipt:
Date Reported:
Project Name:
314-7080-11
12/26/23 9:57 @ 0.3 °C
1/4/2024
Orem 314 Site Investigation
Sample ID: B-2 @ 20ft
Lab ID: 23L1926-02Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 12/22/23 15:30
Preparation
Date/Time
Sampled By: Curt Stripeika
Minimum
Reporting
Limit MethodResult
Inorganic
%12/27/2312/26/230.1 CTF800096.0Total Solids
MBTEXn
mg/kg dry 12/28/2312/28/230.01 EPA 8260D/5030BNDBenzene
mg/kg dry 12/28/2312/28/230.02 EPA 8260D/5030BNDEthylbenzene
mg/kg dry 12/28/2312/28/230.01 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/kg dry 12/28/2312/28/230.02 EPA 8260D/5030BNDNaphthalene
mg/kg dry 12/28/2312/28/230.02 EPA 8260D/5030BNDToluene
mg/kg dry 12/28/2312/28/230.02 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/kg dry 12/28/2312/28/230.248 EPA 8260B/C 5035A/[CALC]NDGasoline Range Organics
Diesel Range
mg/kg dry 12/28/2312/28/2350EPA 8015 CNDDiesel Range Organics
Project Name: Orem 314 Site Investigation CtF WO#: 23L1926
www.ChemtechFord.com
Page 3 of 5Page 3 of 5
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Maverik, Inc.
Mark Stewart
185 S State Street Suite 800
Salt Lake City, UT 84111
PO#:
Receipt:
Date Reported:
Project Name:
314-7080-11
12/26/23 9:57 @ 0.3 °C
1/4/2024
Orem 314 Site Investigation
Report Footnotes
Abbreviations
ND = Not detected at the corresponding Minimum Reporting Limit (MRL).
1 mg/L = one milligram per liter or 1 mg/kg = one milligram per kilogram = 1 part per million.
1 ug/L = one microgram per liter or 1 ug/kg = one microgram per kilogram = 1 part per billion.
1 ng/L = one nanogram per liter or 1 ng/kg = one nanogram per kilogram = 1 part per trillion.
On calculated parameters, there may be a slight difference between summing the rounded values shown on the report
vs the unrounded values used in the calculation.
Project Name: Orem 314 Site Investigation CtF WO#: 23L1926
www.ChemtechFord.com
Page 4 of 5Page 4 of 5
Page 5 of 5
Project Profile

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