DERR-2024-012689

Underwood Environmental Consulting, Inc.
9475 N. Silver Creek Rd., Park City, Utah 84098  Phone [phone]  Fax [phone]

GROUNDWATER MONITORING REPORT – NOVEMBER 2024

Work Plan OAQ-04

December 4, 2024

Express Food and Fuel
(Jacksons #5825)
850 West Highway 40
Vernal, Utah
Facility ID #9000165, Release Site OAQ

Submitted To:

Mr. Andrew Marvin
Jacksons Food Stores
3450 East Commercial Court
Meridian, Idaho 83642

Copy To:

Ms. Nicole Chavez
Department of Environmental Quality
Division of Environmental Response and Remediation
P.O. Box 144840
Salt Lake City, Utah 84114-4840

Groundwater Monitoring Report – November 2024
Express Food and Fuel (Jacksons #5825)
850 West Hwy 40, Vernal, UT
Facility ID #9000165, Release Site OAQ

Underwood Environmental Consulting, Inc.
1

1.0 INTRODUCTION

Underwood Environmental Consulting, Inc. (UEC) conducted a groundwater monitoring event
for Jacksons Companies at the Express Food and Fuel (formerly Fast Stop #1121) service station
in Vernal, Utah. The project site, located at 850 West Highway 40 (821 W. Main St. in DERR
correspondence), includes a convenience store, retail fueling facilities, and car wash (Figure 1).
Quarterly groundwater monitoring has been conducted following a reported release of unleaded
gasoline in May 2021 and a subsequent subsurface investigation in October 2021. The site is
eligible for Petroleum Storage Tank (PST) Fund reimbursement. The Utah Division of
Environmental Response and Remediation (DERR) identifies the project site as Facility ID
#9000165, Release Site OAQ.

2.0 BACKGROUND

The site has one previous release designation (JMP) related to underground storage tank (UST)
system removal in April 1996. One closure soil sample slightly exceeded the recommended
cleanup level (RCL) established at the time. A “no further action” (NFA) letter for Release JMP
was issued in May 1996 (DERR, 1996).

Release OAQ was opened based upon a release of unleaded gasoline reported in May 2021. The
release was reported based on observation of a leaking pipe gasket within the sump under a
dispenser (dispenser 5-6). The applicable UST was immediately taken out of service as a
precaution. Under dispenser repairs were promptly completed and the system was put back into
operation.

UEC performed a subsurface investigation at the site in October 2021. At that time, four
locations were drilled and sampled east of dispenser 5-6 and one location was drilled and
sampled west of the UST basin (Figure 1). No free product was observed during the subsurface
investigation. Hydrocarbons were detected, however, in soil and groundwater samples collected
east of the dispensers (UEC, 2021).

3.0 METHODOLOGY

3.1 Groundwater Monitoring

On November 2, 2024, water levels were measured in four monitoring wells using an electronic
water level indicator. The monitor wells were subsequently purged of three casing volumes of
water prior to sampling. A separate disposable bailer was utilized for each well. The
groundwater samples were labeled appropriately, placed on ice, and submitted to the laboratory
under chain-of-custody. The groundwater samples were analyzed for methyl tertiary butyl ether
(MTBE), benzene, toluene, ethylbenzene, total xylenes, naphthalene (BTEXN), total petroleum
Groundwater Monitoring Report – November 2024
Express Food and Fuel (Jacksons #5825)
850 West Hwy 40, Vernal, UT
Facility ID #9000165, Release Site OAQ

Underwood Environmental Consulting, Inc.
2
hydrocarbons – gasoline range organics (TPH GRO), and TPH – diesel range organics (TPH
DRO) using EPA methods 8260D, 8260B/C, and 8015C.

4.0 RESULTS

4.1 Depth to Water and Flow Direction

On November 2, 2024, the depth to groundwater ranged from 7.8 to 8.63 feet below top-of-
casing (TOC) (Table 1). Figure 1 depicts a groundwater contour map for the project site on the
same date. Based on the measured groundwater elevations, the groundwater flow direction
continues to be east-southeast.

4.2 Groundwater Analytical Results

Four monitoring wells were purged and sampled on November 2, 2024. The groundwater
analytical results presented on Table 1 are compared with Initial Screening Levels (ISLs) and
Tier 1 Levels (DERR, 2005).

One of the four monitoring wells sampled exceeded the Tier 1 level for benzene. The highest
benzene concentration detected in groundwater was 1.17 milligrams-per-liter (mg/L) at MW-1.
Groundwater at MW-2 and MW-3 exceeded the ISL for benzene. One of the four monitoring
wells sampled exceeded the ISL for TPH GRO and TPH DRO. The highest TPH GRO
concentration detected in groundwater was 5.69 mg/L at MW-1. The highest TPH DRO
concentration detected in groundwater was 2.4 mg/L also at MW-1. No petroleum hydrocarbons
were detected in the groundwater sample collected from MW-4 (Table 1; Figure 1).

The laboratory analytical reports for the November 2024 groundwater monitoring event are
provided as an attachment.

5.0 CONCLUSIONS

Based on field observations and the November 2024 groundwater analytical results, the
following conclusions are presented:

• Depth to groundwater ranged from approximately 7.8 to 8.6 feet below top of well
casing.

• The groundwater flow direction continues to be east-southeast.

• The Tier 1 Level for benzene was exceeded at one well location. The highest benzene
concentration detected in groundwater was 1.17 mg/L at MW-1.

Groundwater Monitoring Report – November 2024
Express Food and Fuel (Jacksons #5825)
850 West Hwy 40, Vernal, UT
Facility ID #9000165, Release Site OAQ

Underwood Environmental Consulting, Inc.
3
• The ISL for TPH GRO and TPH DRO was exceeded at one well location. The highest
TPH concentration detected in groundwater was 5.69 mg/L TPH GRO at MW-1.

• No petroleum hydrocarbons were detected in groundwater at MW-4.

The next groundwater monitoring event approved under Work Plan OAQ-04 is tentatively
scheduled for February 2025.

6.0 LIMITATIONS

Our services consist of professional opinions from a state-certified consultant, made in general
accordance with locally accepted environmental practices at the time of execution.
Environmental samples are obtained from specific locations, utilizing methodologies consistent
with Utah Department of Environmental Quality regulations. UEC makes no guarantee, either
expressed or implied, that the analytical results accurately represent subsurface conditions
throughout the entire project site.

Respectfully,
Underwood Environmental Consulting, Inc.
James A. McReel, P.G. L. Earl Underwood, P.G.
Project Geologist, CC-0044 Sr. Geologist, CC-0018

Attachments: Table 1 Groundwater Monitoring Data
Figure 1 Groundwater Contour Map – Nov. 2, 2024
Laboratory Analytical Reports

Groundwater Monitoring Report – November 2024
Express Food and Fuel (Jacksons #5825)
850 West Hwy 40, Vernal, UT
Facility ID #9000165, Release Site OAQ

Underwood Environmental Consulting, Inc.
4

References Cited:

DERR, 1996 Release Site EJMP, Premium/Amoco, 850 W. Highway 40, Vernal, Utah,
Facility Identification No. 9000165: Utah Division of Environmental
Response and Remediation, Salt Lake City, Utah, May 21, 1996.

DERR, 2005 Utah LUST Program Screening Levels for Soil and Groundwater: Utah
Division of Environmental Response and Remediation, Salt Lake City,
Utah, November 1, 2005.

UEC, 2021 Subsurface Investigation Report, Release OAQ, Fast Stop #1121
(Jacksons #5825), 850 West Highway 40, Vernal, Utah, Facility ID
#9000165, Release Site OAQ: Underwood Environmental Consulting,
Inc., Park City, Utah, December 20, 2021.
Groundwater Monitoring Report - November 2024
Express Food and Fuel (Jacksons #5825)
850 West Hwy 40, Vernal, UT
Facility ID 9000165, Release Site OAQ
WELL/DATE DTW
GW
Elev.MTBE Benzene Toluene
Ethyl-
benzene Xylenes
Naphth-
alene
TPH
GRO
TPH
DROELEV.(feet)(feet)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)
MW-1 10/21/21 7.60 91.02 <0.005 5.90 14.2 1.13 7.30 0.389 37.3 7.3
98.62 06/20/22 7.46 91.16 <0.005 3.45 3.05 0.587 2.76 0.150 15.0 3.9
09/16/22 7.37 91.25 <0.005 2.35 1.82 0.735 3.94 0.419 35.6 12.0
12/08/22 8.21 90.41 <0.005 1.00 0.225 0.216 0.533 0.038 11.8 1.6
04/01/23 6.36 92.26 <0.005 0.774 0.509 0.338 1.26 0.058 6.98 2.0
08/13/23 7.54 91.08 <0.005 0.920 0.442 0.681 1.86 0.221 25.2 6.2
11/21/23 8.45 90.17 <0.005 0.555 0.049 0.229 0.430 0.049 2.57 2.2
02/24/24 7.54 91.08 <0.005 1.21 0.678 0.616 2.90 0.123 9.48 3.1
05/23/24 7.78 90.84 <0.005 0.634 0.120 0.388 0.744 0.067 3.96 1.9
11/02/24 8.15 90.47 <0.075 1.17 0.616 0.814 2.88 0.214 5.69 2.4
MW-2 10/21/21 7.24 91.17 <0.005 0.500 0.121 0.098 0.905 0.063 5.22 3.9
98.41 06/20/22 6.96 91.45 <0.005 0.410 0.056 0.152 0.238 0.028 1.53 1.4
09/16/22 6.94 91.47 <0.005 0.096 <0.012 0.050 0.027 0.024 0.786 <1.0
12/08/22 7.81 90.60 <0.005 0.418 0.257 0.165 0.300 0.013 4.68 <1.0
04/01/23 5.84 92.57 <0.005 0.272 0.114 0.136 0.215 <0.012 0.874 <1.0
08/13/23 7.13 91.28 <0.005 0.175 <0.012 0.033 <0.012 <0.012 0.761 1.2
11/21/23 8.05 90.36 <0.005 0.120 <0.012 0.012 <0.012 <0.012 <0.125 <1.0
02/24/24 7.13 91.28 <0.005 0.086 0.018 0.122 0.066 <0.012 0.504 2.2
05/23/24 7.42 90.99 <0.005 0.043 <0.012 0.028 <0.012 <0.012 <0.125 <1.0
11/02/24 7.80 90.61 <0.008 0.018 <0.012 0.012 <0.038 <0.012 <0.125 <1.0
MW-3 10/21/21 8.08 89.93 <0.005 2.14 4.93 0.712 4.50 0.199 17.4 3.9
98.01 06/20/22 7.90 90.11 <0.005 1.54 3.26 0.383 1.91 0.092 9.58 2.7
09/16/22 7.83 90.18 <0.005 0.122 0.324 0.066 0.306 0.026 2.58 <1.0
12/08/22 8.61 89.40 <0.005 0.119 0.350 0.076 0.349 <0.012 2.85 <1.0
04/01/23 6.63 91.38 <0.005 0.010 0.453 0.172 0.724 0.032 2.99 <1.0
08/13/23 8.00 90.01 <0.005 0.010 0.041 0.024 0.116 <0.012 0.323 <1.0
11/21/23 8.86 89.15 <0.005 <0.005 <0.012 0.023 0.084 <0.012 <0.125 <1.0
02/24/24 8.06 89.95 <0.005 <0.005 <0.012 0.027 0.101 <0.012 0.266 <1.0
05/23/24 8.29 89.72 <0.005 0.008 <0.012 0.038 0.157 <0.012 0.418 <1.0
11/02/24 8.63 89.38 <0.008 0.018 0.014 0.090 0.341 0.027 0.767 <1.0
MW-4 10/21/21 7.41 92.59 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
100.00 06/20/22 7.27 92.73 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
09/16/22 7.13 92.87 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
12/08/22 8.24 91.76 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
04/01/23 6.59 93.41 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
08/13/23 7.48 92.52 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
11/21/23 8.52 91.48 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
02/24/24 7.64 92.36 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
05/23/24 7.78 92.22 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
11/02/24 8.15 91.85 <0.008 <0.005 <0.012 <0.012 <0.038 <0.012 <0.125 <1.0
Initial Screening Levels (1)0.2 0.005 1 0.7 10 0.7 1 1
Tier 1 Screening Criteria (1)0.2 0.3 3 4 10 0.7 10 10
Notes:Arbitrary datum of 100.00 feet established on site.MTBE = Methyl Tertiary Butyl Ether
DTW = Depth to Water TPH GRO = Total Petroleum Hydrocarbons-Gasoline Range Organics
FPT = Free Product Thickness TPH DRO = Total Petroleum Hydrocarbons-Diesel Range Organics
GW Elev. = Groundwater Elevation < Indicates below given detection limit.
Bold values are above Initial Screening Levels.(1) DERR, 2005
Highlighted,bold , values are above Tier 1 Screening Criteria.
TABLE 1
GROUNDWATER MONITORING DATA
Underwood Environmental Consulting, Inc.
LEGEND
approx. scale in feet
one inch ~ 40 feet
00 4020
Express Food and Fuel
(Jacksons #5825)
850 West Highway 40
Vernal, Utah
Facility ID # 9000165
Release Site OAQ
NORTH
W
SD ?
P
P
P
P
GG G
W
W
C
S
E E
E
W P
Natural Gas
Water Line / Meter
G
W
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(Utility Locations Approximate)
Power or Electical
SD Storm Drain
CommunicationsC
P
Sanitary Sewer
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Main St
West

H
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80
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Express Food
and Fuel
US Postal Service
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UL UL D
Canopy
Dispensers
5/6
FIGURE 1
GROUNDWATER
CONTOUR MAP
(Nov. 2, 2024)
11/27/24
MW-2
Monitoring Well
B-1
Soil Boring
9
1
Groundwater Contour Line
(contour interval = 0.5 ft)
Groundwater
Flow Direction90.61 Groundwater Elev. (ft)
(B-1)
B-2
MW-3
MW-1
MW-2
MW-4
LI
C
E
N
S
ED
PR O F E S S I O NALG
E
O
L
O
G
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ST
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PR O F E S S I O NALG
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JAMES

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McREELJAMES

A
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McREEL
542085
4
-
2
2
5
0
90.47
90.61
89.38
91.85
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
Underwood Environmental Consulting
Attn: James McReel
9475 North Silver Creek Road
Park City, UT 84098
Work Order: 24K0059
Project: Jacksons #5825 Vernal
11/11/2024
Approved By:
Mark Broadhead, Project Manager
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 7
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
Underwood Environmental Consulting
James McReel
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OAQ
11/4/24 9:45 @ 1.3 °C
11/11/2024
Jacksons #5825 Vernal
Sample ID: MW - 1
Lab ID: 24K0059-01Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 11/2/24 11:50
Preparation
Date/Time
Sampled By: James McReel
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 11/7/2411/7/240.050 EPA 8260D/5030B1.17Benzene
mg/L 11/7/2411/7/240.125 EPA 8260D/5030B0.814Ethylbenzene
mg/L J-LOW-C11/7/2411/7/240.075 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 11/7/2411/7/240.125 EPA 8260D/5030B0.214Naphthalene
mg/L 11/7/2411/7/240.125 EPA 8260D/5030B0.616Toluene
mg/L 11/7/2411/7/240.375 EPA 8260D/5030B2.88Xylenes, total
Gasoline Range
mg/L 11/7/2411/7/241.25 EPA 8260B/C /5030A/[CALC]5.69Gasoline Range Organics
Diesel Range
mg/L 11/7/2411/6/241.0 EPA 8015 C2.4Diesel Range Organics
Project Name: Jacksons #5825 Vernal CtF WO#: 24K0059
www.ChemtechFord.com
Page 2 of 7Page 2 of 7
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
Underwood Environmental Consulting
James McReel
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OAQ
11/4/24 9:45 @ 1.3 °C
11/11/2024
Jacksons #5825 Vernal
Sample ID: MW - 2
Lab ID: 24K0059-02Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 11/2/24 11:15
Preparation
Date/Time
Sampled By: James McReel
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 11/6/2411/5/240.005 EPA 8260D/5030B0.018Benzene
mg/L 11/6/2411/5/240.012 EPA 8260D/5030B0.012Ethylbenzene
mg/L J-LOW-L11/6/2411/5/240.008 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 11/6/2411/5/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 11/6/2411/5/240.012 EPA 8260D/5030BNDToluene
mg/L 11/6/2411/5/240.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 11/6/2411/5/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 11/7/2411/6/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Jacksons #5825 Vernal CtF WO#: 24K0059
www.ChemtechFord.com
Page 3 of 7Page 3 of 7
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
Underwood Environmental Consulting
James McReel
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OAQ
11/4/24 9:45 @ 1.3 °C
11/11/2024
Jacksons #5825 Vernal
Sample ID: MW - 3
Lab ID: 24K0059-03Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 11/2/24 12:05
Preparation
Date/Time
Sampled By: James McReel
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 11/6/2411/5/240.005 EPA 8260D/5030B0.018Benzene
mg/L 11/6/2411/5/240.012 EPA 8260D/5030B0.090Ethylbenzene
mg/L J-LOW-L11/6/2411/5/240.008 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 11/6/2411/5/240.012 EPA 8260D/5030B0.027Naphthalene
mg/L 11/6/2411/5/240.012 EPA 8260D/5030B0.014Toluene
mg/L 11/6/2411/5/240.038 EPA 8260D/5030B0.341Xylenes, total
Gasoline Range
mg/L 11/6/2411/5/240.125 EPA 8260B/C /5030A/[CALC]0.767Gasoline Range Organics
Diesel Range
mg/L 11/7/2411/6/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Jacksons #5825 Vernal CtF WO#: 24K0059
www.ChemtechFord.com
Page 4 of 7Page 4 of 7
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
Underwood Environmental Consulting
James McReel
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OAQ
11/4/24 9:45 @ 1.3 °C
11/11/2024
Jacksons #5825 Vernal
Sample ID: MW - 4
Lab ID: 24K0059-04Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 11/2/24 11:00
Preparation
Date/Time
Sampled By: James McReel
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 11/6/2411/5/240.005 EPA 8260D/5030BNDBenzene
mg/L 11/6/2411/5/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L J-LOW-L11/6/2411/5/240.008 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 11/6/2411/5/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 11/6/2411/5/240.012 EPA 8260D/5030BNDToluene
mg/L 11/6/2411/5/240.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 11/6/2411/5/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 11/7/2411/6/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Jacksons #5825 Vernal CtF WO#: 24K0059
www.ChemtechFord.com
Page 5 of 7Page 5 of 7
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
Underwood Environmental Consulting
James McReel
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OAQ
11/4/24 9:45 @ 1.3 °C
11/11/2024
Jacksons #5825 Vernal
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.
Flag Descriptions
J-LOW-C = Estimated low due to low recovery of CCV
J-LOW-L = Estimated low due to low recovery of LCS
Project Name: Jacksons #5825 Vernal CtF WO#: 24K0059
www.ChemtechFord.com
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