DERR-2024-011493

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

GROUNDWATER MONITORING REPORT
OCTOBER 2024

J Oil #5820
(Former Premium Oil #8)
305 South Main St.
Richfield, Utah
DERR Facility ID #2000222
Release Site GUP

PREPARED BY:

Underwood Environmental Consulting, Inc.
9475 N. Silver Creek Rd.
Park City, Utah 84098

PREPARED FOR:

Jacksons Food Stores
3430 East Commercial Court
Meridian, Idaho 83642

SUBMITTED:

October 18, 2024

Groundwater Monitoring Report – October 2024
J Oil #5820
Richfield, UT

Underwood Environmental Consulting, Inc.
1

1.0 INTRODUCTION

Underwood Environmental Consulting, Inc. (UEC) has been retained by Jacksons Food Stores to
perform groundwater monitoring at J Oil #5820, a fuel station located at 305 South Main St.,
Richfield, Utah (project site) (Figure 1). The project site is referred to as Facility ID #2000222,
Release Site GUP, in Utah Division of Environmental Response and Remediation (DERR) records
and correspondence. The groundwater monitoring is being conducted in response to the
“Additional Sampling Requirements” letter, dated March 15, 2024, from the DERR project
manager.

2.0 BACKGROUND

The “Additional Sampling Requirements” letter recommended two rounds of groundwater
sampling for gasoline constituents at down-gradient monitoring wells MW-1 and MW-A. It was
also stipulated that if representative groundwater samples could not be collected, due to the decline
in the water table, that MW-1 and/or MW-A should be deepened or replaced (DERR, 2024).

In April 2024, UEC personnel visited the Richfield project site to assess the condition of
monitoring wells MW-1 and MW-A. Monitoring well MW-A was found to have an adequate
water column and was sampled. MW-1 was observed to not be deep enough to allow collection
of representative groundwater samples.

In May 2024, MW-1 was abandoned and replaced with a deeper monitoring well (MW-1R). No
petroleum hydrocarbons were detected in the initial groundwater sample. More details on well
replacement are found in the previous groundwater monitoring report (UEC, 2024).

3.0 METHODOLOGY

UEC personnel visited the Richfield project site on October 8, 2024 to collect select groundwater
level measurements and to sample monitoring wells MW-A and MW-1R. The two monitor wells
were purged of three casing volumes of water, or until dry, prior to sampling. A separate
disposable bailer was utilized to sample 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), and total petroleum hydrocarbons – gasoline
range organics (TPH-GRO) using EPA methods 8260D and 8260B/C.

Groundwater Monitoring Report – October 2024
J Oil #5820
Richfield, UT

Underwood Environmental Consulting, Inc.
2
4.0 FINDINGS

4.1 October 2024 - Depth to Water and Flow Direction

Depth to groundwater measurements were used to calculate relative groundwater elevations across
the site. The water level at MW-2 was the same as measured six months ago, while other water
levels changed, so, the water level at MW-2 is viewed as suspect. Figure 1 depicts a groundwater
contour map for the site on October 8, 2024 based on limited data points. The groundwater flow
direction was determined to be south-southeast, the same as determined previously.

4.2 Groundwater Analytical Results

In October 2024, no MTBE, BTEXN, or TPH-GRO was detected in the groundwater samples
collected from MW-1R and MW-A.

The laboratory analytical reports and chain of custody documentation are provided as an
attachment.

5.0 CONCLUSIONS

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

• Monitoring well MW-1 was abandoned and replaced in May 2024. The replacement well
is about seven feet deeper and designated MW-1R.

• The groundwater flow direction in October 2024 was to the south-southeast.

• No MTBE, BTEXN, or TPH-GRO was detected in the groundwater samples collected
from MW-1R and MW-A in October 2024.

Given the lack on petroleum hydrocarbons detected in groundwater at MW- 1R and MW-A,
release site GUP should be considered for closure.

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.

Groundwater Monitoring Report – October 2024
J Oil #5820
Richfield, UT

Underwood Environmental Consulting, Inc.
3
Sincerely,
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 Analytical Results
Figure 1 Groundwater Contour Map – October 8, 2024
Laboratory Analytical Reports

References Cited:

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.

DERR, 2024 Additional Sampling Requirements, J Oil #5820, located at 305 South Main
Street, Richfield, Utah, Facility Identification No. 2000222, Release Site
GUP: Utah Division of Environmental Response and Remediation, Salt
Lake City, Utah, March 15, 2024.

UEC, 2024 Groundwater Monitoring Report, May 2024, J Oil #5820 (former Premium
Oil #8), 305 South Main Street, Richfield, Utah, DERR Facility ID
#2000222, Release Site GUP: Underwood Environmental Consulting, Park
City, Utah, June 13, 2024.
Groundwater Monitoring Report - October 2024
J Oil #5820
Richfield, UT
Sample ID/
TOC
DATE Depth to
Water (ft)
GW
Elevation
(ft)
MTBE
(mg/L)
Benzene
(mg/L)
Toluene
(mg/L)
Ethyl-
benzene
(mg/L)
Total
Xylenes
(mg/L)
Naphtha-
lene
(mg/L)
TPH
(GRO)
(mg/L)
TPH
(DRO)
(mg/L)
MW-1 7/12/2005 17.04 82.86 0.159 <0.002 <0.002 <0.002 <0.006 <0.002 <0.50 <0.50
99.90 9/30/2005 16.66 83.24 0.105 <0.002 <0.002 <0.002 <0.006 <0.004 <0.50 <0.50
1/10/2006 18.76 81.14 0.264 <0.002 <0.002 <0.002 <0.006 <0.004 <0.50 <0.50
4/13/2006 19.27 80.63 0.090 <0.002 <0.002 <0.002 <0.013 0.015 <0.50 <0.50
7/7/2006 17.15 82.75 0.169 <0.002 <0.002 <0.002 <0.006 <0.004 <0.50 <0.50
11/6/2006 17.66 82.24 0.226 <0.002 <0.004 <0.004 <0.012 0.003 <0.50 <0.50
3/26/2007 17.67 82.23 0.333 <0.002 <0.002 <0.002 <0.06 0.003 <0.50 <0.50
7/3/2007 16.74 83.16 0.161 <0.002 <0.002 <0.002 <0.06 <0.004 <0.50 <0.50
10/2/2007 16.77 83.13 0.069 <0.002 <0.002 <0.002 <0.006 <0.002 <0.50 <0.50
4/17/2008 17.25 82.65 0.169 <0.001 0.001 <0.001 <0.003 <0.005 0.166 10.6
10/23/2008 16.22 83.68 0.228 <0.001 0.001 <0.001 <0.003 <0.001 0.224 <2.0
4/20/2009 16.66 83.24 0.942 <0.002 <0.002 <0.002 <0.006 <0.002 <0.50 <0.50
10/13/2009 15.98 83.92 0.733 <0.001 <0.001 <0.001 <0.003 0.002 <0.05 <1
3/11/2010 15.38 84.52 0.559 <0.001 <0.001 <0.001 <0.003 <0.002 0.152 <1
9/2/2010 16.10 83.80 0.550 <0.001 <0.001 <0.001 <0.003 0.005 0.321 <1
3/1/2011 17.35 82.55 0.251 0.003 0.014 <0.002 0.014 <0.002 <0.50 <0.50
9/8/2011 15.72 84.18 0.154 <0.002 <0.002 <0.002 <0.006 <0.002 <0.50 <0.50
3/27/2012 16.53 83.37 0.094 <0.001 <0.001 <0.001 <0.003 <0.002 <0.05 <1
8/14/2012 15.90 84.00 0.040 <0.001 <0.001 <0.001 <0.003 <0.002 <0.05 <1
4/10/2013 16.70 83.20 0.037 <0.001 <0.001 <0.001 <0.003 <0.002 <0.05 <1
10/18/2013 16.80 83.10 0.054 <0.001 <0.001 <0.001 <0.003 <0.002 <0.05 <1
3/14/2014 16.64 83.26 0.084 <0.002 <0.002 <0.002 <0.006 <0.002 <0.50 <0.50
9/19/2014 16.03 83.87 0.051 <0.001 <0.005 <0.001 <0.003 <0.005 <0.10 <0.50
99.88 9/24/2015 17.20 82.68 <0.005 <0.002 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0
1/19/2016 18.12 81.76 <0.005 <0.002 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0
8/19/2016 17.27 82.61 <0.005 <0.002 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0
12/1/2017 19.37 80.51
3/8/2018 19.49 80.39
4/10/2024 19.66 80.22
5/21/2024
MW-1R 5/22/2024 20.06 80.01 ----------------
100.07 5/28/2024 19.85 80.22 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 NA
10/8/2024 20.14 79.93 <0.008 <0.005 <0.012 <0.012 <0.038 <0.012 <0.125 NA
MW-2 7/12/2005 16.20 83.74 0.010 0.003 <0.002 0.004 <0.006 0.002 0.59 <0.50
99.94 9/30/2005 15.70 84.24 0.003 0.002 <0.002 0.004 <0.006 <0.004 0.60 <0.50
1/10/2006 17.77 82.17 <0.002 0.002 <0.002 0.004 <0.006 <0.004 <0.50 1.93
4/13/2006 18.23 81.71 0.005 0.004 <0.002 <0.002 <0.013 0.006 <0.50 1.04
7/7/2006 17.22 82.72 <0.002 0.002 <0.002 0.004 <0.006 0.011 <0.50 2.69
11/6/2006 17.78 82.16 <0.002 0.002 <0.004 0.004 <0.012 0.003 <0.50 1.40
3/26/2007 16.72 83.22 <0.002 <0.002 <0.002 <0.002 <0.06 0.003 <0.50 0.911
7/3/2007 15.70 84.24 <0.002 <0.002 <0.002 <0.002 <0.06 0.003 <0.50 1.3
10/2/2007 15.52 84.42 <0.002 <0.002 <0.004 <0.002 <0.006 0.003 <0.50 0.69
4/17/2008 16.04 83.90 <0.001 0.001 <0.001 <0.001 <0.003 <0.005 0.598 2.3
10/23/2008 14.95 84.99 <0.001 0.001 <0.001 <0.001 <0.003 <0.001 0.187 <2.0
4/20/2009 15.28 84.66 0.005 <0.002 <0.002 <0.002 <0.006 <0.002 <0.50 <0.50
10/13/2009 14.48 85.46 0.086 0.029 <0.001 0.004 <0.003 <0.001 <0.05 <1
3/11/2010 13.90 86.04 <0.001 <0.001 <0.001 <0.001 <0.003 <0.002 0.107 <1
9/2/2010 14.74 85.20 0.005 <0.001 <0.001 <0.001 <0.003 0.005 0.096 <1
3/1/2011 16.25 83.69 <0.002 <0.002 <0.002 <0.002 <0.006 <0.002 <0.50 <0.50
9/8/2011 14.45 85.49 <0.002 <0.002 <0.002 <0.002 <0.006 <0.002 <0.50 <0.50
3/27/2012 15.37 84.57 <0.001 <0.001 <0.001 <0.001 <0.003 <0.002 <0.05 <1
8/14/2012 14.70 85.24 <0.001 <0.001 <0.001 <0.001 <0.003 <0.002 0.076 <1
4/10/2013 15.59 84.35 <0.001 <0.001 <0.001 <0.001 <0.003 <0.002 0.096 <1
10/18/2013 17.06 82.88 <0.001 <0.001 <0.001 <0.001 <0.003 <0.002 0.077 <1
3/14/2014 15.40 84.54 <0.002 <0.002 <0.002 <0.002 <0.006 <0.002 <0.50 <0.50
9/19/2014 14.74 85.20 <0.001 <0.001 <0.005 <0.001 <0.003 <0.005 <0.10 <0.50
99.83 9/24/2015 15.98 83.85 <0.005 <0.002 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0
1/19/2016 17.04 82.79 <0.005 <0.002 <0.005 <0.005 <0.005 <0.005 0.153 <1.0
8/19/2016 16.28 83.55 <0.005 <0.002 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0
12/1/2017 18.40 81.43 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
3/8/2018 18.55 81.28 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
4/10/2024 19.07 80.76 ----------------
10/8/2024 19.07 80.76 ----------------
0.2 0.005 1 0.7 10 0.7 1 1
0.2 0.3 3 4 10 0.7 10 10
Initial Screening Levels
RBCA Tier 1 Screening Criteria
Not Sampled - Insufficient Water to Sample
Table 1
Groundwater Analytical Results
J Oil #5820 (Former Premium Oil #8)
Fac. ID #2000222, Release Code GUP
Historical Groundwater Data
Not Sampled - Insufficient Water to Sample
Not Sampled - Insufficient Water to Sample
Well Abandoned
Underwood Environmental Consulting, Inc.1 of 5
Groundwater Monitoring Report - October 2024
J Oil #5820
Richfield, UT
Sample ID/
TOC
DATE Depth to
Water (ft)
GW
Elevation
(ft)
MTBE
(mg/L)
Benzene
(mg/L)
Toluene
(mg/L)
Ethyl-
benzene
(mg/L)
Total
Xylenes
(mg/L)
Naphtha-
lene
(mg/L)
TPH
(GRO)
(mg/L)
TPH
(DRO)
(mg/L)
Table 1
Groundwater Analytical Results
J Oil #5820 (Former Premium Oil #8)
Fac. ID #2000222, Release Code GUP
Hi i l G d DMW-3 7/12/2005 15.50 84.50 0.139 0.24 0.263 0.089 0.448 0.024 4.31 2.08
100.00 9/30/2005 15.04 84.96 0.200 0.26 0.156 0.05 0.281 0.011 2.84 <0.50
1/10/2006 17.14 82.86 0.637 0.039 0.023 0.009 0.017 <0.004 1.01 2.81
4/13/2006 17.47 82.53 0.343 0.003 0.003 <0.004 <0.013 0.003 <0.50 <0.50
7/7/2006 15.40 84.60 0.268 0.112 0.003 0.028 0.039 0.008 <0.50 2.07
11/6/2006 15.50 84.50 0.268 0.066 <0.004 0.028 0.039 0.008 <0.50 1.82
3/26/2007 15.67 84.33 0.057 0.04 <0.002 0.006 0.017 0.003 <0.50 <0.50
7/3/2007 14.35 85.65 0.131 0.104 <0.002 0.011 0.029 <0.004 <0.50 <0.50
10/2/2007 14.30 85.70 0.139 0.013 <0.004 <0.002 <0.006 <0.002 <0.50 0.67
4/17/2008 15.25 84.75 0.065 0.028 <0.001 0.002 0.008 <0.005 0.288 <2.0
10/23/2008 14.00 86.00 0.217 0.184 0.001 0.034 0.016 0.002 0.535 <2.0
4/20/2009 14.45 85.55 0.094 0.017 <0.002 0.002 <0.006 <0.002 <0.50 <0.50
10/13/2009 13.67 86.33 0.086 0.029 <0.001 0.004 <0.003 <0.001 0.194 <1
3/11/2010 13.10 86.90 0.168 0.033 <0.001 0.004 <0.003 <0.002 <1 0.295
9/2/2010 14.03 85.97 0.114 0.014 <0.001 <0.001 <0.003 0.004 0.258 <1
3/1/2011 15.35 84.65 0.076 <0.002 <0.002 <0.002 <0.006 <0.002 <0.50 <0.50
9/8/2011 13.35 86.65 0.166 0.028 <0.002 0.004 <0.006 <0.002 <0.50 <0.50
3/27/2012 14.34 85.66 0.063 <0.001 <0.001 <0.001 <0.003 <0.002 0.231 <1
8/14/2012 13.30 86.70 0.074 0.022 <0.001 0.004 <0.003 <0.002 0.207 <1
4/10/2013 14.72 85.28 0.087 0.019 <0.001 0.005 <0.003 <0.002 0.306 <1
10/18/2013 14.80 85.20 0.044 0.009 <0.001 0.003 <0.003 <0.002 0.251 <1
3/14/2014 ₋₋₋₋
9/19/2014 13.31 86.69 0.076 <0.042 <0.005 0.023 0.0046 <0.005 0.44 1.04
9/24/2015 ₋₋₋₋
MW-3A 7/12/2005 15.40 84.49 <0.004 0.019 <0.002 0.006 <0.006 <0.002 0.52 1.50
99.89 9/30/2005 14.85 85.04 <0.002 0.003 <0.002 <0.002 <0.006 <0.004 <0.50 <0.50
99.76 9/24/2015 14.74 85.02 <0.005 <0.002 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0
1/19/2016 15.97 83.79 <0.005 <0.002 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0
8/19/2016 14.63 85.13 <0.005 <0.002 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0
12/1/2017 17.17 82.59 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
3/8/2018 17.27 82.49 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
4/10/2024 ₋₋₋₋
5/22/2024 18.08 81.68 ----------------
10/8/2024 18.44 81.32
MW-4 7/12/2005 15.20 84.38 0.867 0.286 0.133 0.07 0.224 0.003 1.81 <0.5
99.58 9/30/2005 14.77 84.81 3.110 1.17 0.642 0.269 1.03 <0.200 8.08 <0.50
1/10/2006 16.90 82.68 1.557 0.012 0.006 <0.002 0.011 <0.004 <0.50 1.83
4/13/2006 17.22 82.36 1.023 0.01 <0.002 <0.002 <0.013 <0.002 <0.50 <0.50
7/7/2006 16.14 83.44 1.106 0.014 0.002 0.002 <0.006 <0.004 <0.50 <0.50
11/6/2006 16.56 83.02 2.230 0.032 <0.004 0.005 <0.012 0.003 <0.50 <0.50
3/26/2007 15.28 84.30 1.38 0.008 <0.002 <0.002 <0.006 0.002 <0.50 <0.50
7/3/2007 14.29 85.29 2.15 0.074 <0.002 0.012 0.009 <0.004 <0.50 <0.50
10/2/2007 14.05 85.53 6.01 2.63 0.747 0.21 0.824 0.015 5.99 1.41
4/17/2008 15.00 84.58 2.67 0.082 <0.05 <0.05 <0.15 <0.025 0.271 <2.0
10/23/2008 13.78 85.80 2.27 0.128 <0.001 0.009 0.004 0.004 0.461 <2.0
4/20/2009 14.28 85.30 0.816 0.019 <0.004 <0.004 <0.012 0.018 <0.50 <0.50
10/13/2009 13.59 85.99 2.74 0.026 <0.001 0.003 <0.003 <0.001 <0.05 <1
3/11/2010 12.92 86.66 1.87 0.031 <0.001 0.006 <0.003 <0.002 0.583 <1
9/2/2010 13.85 85.73 <0.001 0.036 <0.001 0.003 <0.003 0.005 1.65 <1
3/1/2011 15.13 84.45 0.526 <0.002 0.004 <0.002 <0.006 <0.002 <0.50 <0.50
9/8/2011 13.15 86.43 3.69 0.11 <0.002 0.024 <0.006 <0.002 <0.50 <0.50
3/27/2012 14.07 85.51 2.24 0.007 <0.001 <0.001 <0.003 <0.002 0.168 <1
8/14/2012 13.06 86.52 1.77 0.101 <0.005 0.021 0.018 <0.01 0.818 <1
4/10/2013 14.40 85.18 1.35 <0.01 <0.01 <0.01 <0.03 0.023 0.878 <1
10/18/2013 14.51 85.07 1.27 0.009 <0.001 0.001 <0.003 <0.002 0.828 <1
3/14/2014 14.37 85.21 0.057 0.02 <0.002 0.004 <0.006 <0.002 <0.50 0.78
9/19/2014 13.31 86.27 2.1 0.052 <0.005 0.007 <0.003 <0.005 1.8 <0.50
9/24/2015 ₋₋₋₋
0.2 0.005 1 0.7 10 0.7 1 1
0.2 0.3 3 4 10 0.7 10 10
Not Sampled
Well Destroyed
Well Destroyed
Not Located
Initial Screening Levels
RBCA Tier 1 Screening Criteria
Underwood Environmental Consulting, Inc.2 of 5
Groundwater Monitoring Report - October 2024
J Oil #5820
Richfield, UT
Sample ID/
TOC
DATE Depth to
Water (ft)
GW
Elevation
(ft)
MTBE
(mg/L)
Benzene
(mg/L)
Toluene
(mg/L)
Ethyl-
benzene
(mg/L)
Total
Xylenes
(mg/L)
Naphtha-
lene
(mg/L)
TPH
(GRO)
(mg/L)
TPH
(DRO)
(mg/L)
Table 1
Groundwater Analytical Results
J Oil #5820 (Former Premium Oil #8)
Fac. ID #2000222, Release Code GUP
Hi i l G d DMW-4R 9/23/2015 14.46 84.83 0.302 0.029 0.048 0.021 0.360 0.005 1.53 1.3
99.29 1/19/2016 Dry --
3/18/2016 15.79 83.50 0.071 <0.002 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0
8/19/2016 14.35 84.94 0.010 <0.002 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0
12/1/2017 16.92 82.37 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
3/8/2018 16.90 82.39 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
4/10/2024 ₋₋₋₋
MW-5 3/1/2004 ₋₋₋₋2.47 2.45 0.017 0.330 1.250 <0.010 9.52 2.55
99.43 7/12/2005 15.62 83.81 1.452 0.644 0.351 0.073 0.399 0.006 2.91 <0.50
9/30/2005 15.15 84.28 3.780 2.16 2.730 0.298 1.520 <0.200 13.4 <0.50
1/10/2006 17.33 82.10 1.278 0.258 0.126 0.02 0.143 <0.004 1.32 2.33
4/13/2006 17.65 81.78 1.175 0.285 0.167 0.032 0.145 0.003 0.67 0.93
7/7/2006 15.60 83.83 3.718 1.077 0.570 0.117 0.586 <0.220 5.72 1.95
11/6/2006 15.93 83.50 4.27 1.28 0.572 <0.220 0.749 0.121 7.74 2.21
3/26/2007 15.82 83.61 6.42 0.971 0.012 0.102 0.123 0.017 1.70 1.41
7/3/2007 14.75 84.68 5.36 1.40 0.093 0.153 0.476 0.026 2.77 0.887
10/2/2007 14.15 85.28 1.39 0.185 <0.022 0.021 0.044 0.014 0.68 0.93
4/17/2008 15.30 84.13 5.23 0.138 <0.05 0.157 0.342 <0.25 2.04 <2.0
10/23/2008 14.15 85.28 5.95 2.68 0.283 0.426 0.783 0.03 5.43 <2.0
4/20/2009 14.27 85.16 0.745 0.326 <0.004 0.052 0.074 0.010 0.70 5.44
10/13/2009 13.58 85.85 2.60 0.562 0.01 0.084 0.049 0.009 0.531 <1
3/11/2010 13.25 86.18 1.96 0.363 0.067 0.051 0.064 0.005 0.843 <1
9/2/2010 14.18 85.25 1.58 0.464 0.014 0.029 0.053 0.006 2.18 <1
3/1/2011 15.45 83.98 0.838 0.007 <0.002 <0.002 <0.006 <0.002 <0.50 <0.50
9/8/2011 13.50 85.93 7.56 2.53 0.034 0.313 1.84 0.037 5.45 3.78
3/27/2012 14.43 85.00 7.56 1.98 0.006 0.212 0.417 0.037 4.74 <1
8/14/2012 13.38 86.05 3.62 1.48 0.010 0.232 0.441 <0.02 10.2 <1
4/10/2013 14.85 84.58 7.80 2.33 <0.05 0.371 0.489 0.134 7.03 <1
10/18/2013 14.85 84.58 2.29 1.02 0.004 0.247 0.325 0.018 4.09 <1
3/13/2014 14.66 84.77 1.40 0.583 0.004 0.014 0.069 0.004 1.55 1.20
9/19/2014 13.50 85.93 2.1 1.1 <0.005 0.24 0.24 0.014 6.8 3.46
9/23/2015 ₋₋₋₋
MW-5R 9/23/2015 14.63 84.80 0.400 0.020 0.031 <0.005 0.184 <0.005 0.977 1.1
99.43 1/19/2016 Dry --
3/18/2016 15.85 83.58 0.084 <0.002 <0.005 <0.005 <0.005 <0.005 0.185 <1.0
8/19/2016 14.48 84.95 0.074 0.004 <0.005 <0.005 <0.005 <0.005 <0.050 1.7
12/1/2017 17.05 82.38 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
3/8/2018 17.01 82.42 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
4/10/2024 18.31 81.12 ----------------
0.2 0.005 1 0.7 10 0.7 1 1
0.2 0.3 3 4 10 0.7 10 10
Not Sampled
Not Sampled
Well Destroyed
Initial Screening Levels
RBCA Tier 1 Screening Criteria
Not Accessed
Underwood Environmental Consulting, Inc.3 of 5
Groundwater Monitoring Report - October 2024
J Oil #5820
Richfield, UT
Sample ID/
TOC
DATE Depth to
Water (ft)
GW
Elevation
(ft)
MTBE
(mg/L)
Benzene
(mg/L)
Toluene
(mg/L)
Ethyl-
benzene
(mg/L)
Total
Xylenes
(mg/L)
Naphtha-
lene
(mg/L)
TPH
(GRO)
(mg/L)
TPH
(DRO)
(mg/L)
Table 1
Groundwater Analytical Results
J Oil #5820 (Former Premium Oil #8)
Fac. ID #2000222, Release Code GUP
Hi i l G d DMW-6 3/1/2004 ₋₋₋₋<0.002 <0.002 <0.002 <0.002 <0.006 <0.002 401 <0.50
100.00 7/12/2005 16.07 83.93 0.306 0.031 <0.002 0.009 <0.006 <0.002 <0.50 <0.50
9/30/2005 15.60 84.40 0.523 0.188 0.005 0.052 0.018 0.008 1.09 <0.50
1/10/2006 17.74 82.26 0.615 0.073 0.002 0.017 0.014 <0.004 0.58 1.97
4/13/2006 18.17 81.83 0.559 0.055 <0.002 0.009 <0.013 <0.002 <0.50 1.06
7/7/2006 16.00 84.00 0.876 0.026 <0.002 0.007 <0.006 <0.004 <0.50 1.68
11/6/2006 16.49 83.51 0.865 0.108 <0.004 0.02 <0.012 0.005 <0.50 2.28
3/26/2007 16.33 83.67 1.08 0.362 0.004 0.052 0.03 0.009 1.04 1.30
7/3/2007 15.31 84.69 1.25 0.332 0.003 0.032 0.02 0.014 0.77 0.986
10/2/2007 15.15 84.85 2.59 0.082 0.008 0.013 0.036 0.004 <0.50 1.01
4/17/2008 15.95 84.05 1.40 0.590 <0.01 <0.01 <0.03 <0.05 3.94 2.3
10/23/2008 14.78 85.22 0.992 1.25 0.010 0.282 0.128 0.112 2.93 <2.0
4/20/2009 15.27 84.73 0.633 0.357 <0.004 0.024 0.027 0.050 0.83 6.66
10/13/2009 14.47 85.53 0.912 0.863 0.007 0.226 0.031 0.103 1.26 1.3
3/11/2010 13.76 86.24 0.850 1.19 0.006 0.156 0.064 0.091 <0.05 <1
9/2/2010 14.70 85.30 <0.001 0.156 <0.001 0.019 0.003 0.015 0.907 <1
3/1/2011 16.00 84.00 0.499 0.773 0.004 0.06 0.029 0.034 1.52 2.14
9/8/2011 14.10 85.90 0.538 0.788 0.009 0.277 0.027 0.114 2.08 4.24
3/27/2012 14.90 85.10 1.14 0.942 <0.001 0.067 <0.003 0.092 2.01 <1
8/14/2012 14.20 85.80 1.06 0.232 <0.005 0.022 <0.015 0.013 1.53 <1
4/10/2013 14.98 85.02 2.03 0.880 <0.02 0.048 <0.06 0.076 2.54 <1
10/18/2013 15.25 84.75 1.27 0.369 0.002 0.036 <0.03 0.027 1.55 1
3/14/2014 15.19 84.81 1.41 0.451 0.004 0.03 0.007 0.016 1.75 1.74
9/19/2014 14.22 85.78 1.1 0.57 <0.005 0.1 0.004 0.046 1.8 1.55
99.95 9/24/2015 15.64 84.31 1.63 <0.002 <0.005 <0.005 <0.005 <0.005 1.62 <1.0
1/19/2016 16.81 83.14 0.642 0.039 <0.005 <0.005 <0.005 <0.005 1.07 <1.0
8/19/2016 15.61 84.34
MW-6R 8/19/2016 15.39 84.33 1.05 0.018 <0.005 <0.005 <0.005 <0.005 0.786 <1.0
99.72 12/1/2017 17.84 81.88 0.118 0.177 <0.012 <0.012 <0.012 <0.012 1.04 <1.0
3/8/2018 17.99 81.73 0.019 0.047 <0.012 <0.012 <0.012 <0.012 0.246 <1.0
4/10/2024 19.05 80.67 ----------------
MW-7 9/30/2005 16.45 83.55 0.009 <0.002 <0.002 <0.002 <0.006 <0.004 <0.50 <0.50
100.00 4/13/2006 18.09 81.91 0.020 <0.002 <0.002 <0.004 <0.13 <0.002 <0.50 <0.50
9/24/2015 15.70 84.30 <0.005 <0.002 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0
1/19/2016 16.84 83.16 <0.005 <0.002 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0
8/19/2016 15.38 84.62 <0.005 <0.002 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0
12/1/2017 17.98 82.02 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
3/8/2018 18.12 81.88 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
4/10/2024 18.99 81.01 ----------------
10/8/2024 19.27 80.73
0.2 0.005 1 0.7 10 0.7 1 1
0.2 0.3 3 4 10 0.7 10 10
Well Abandoned
Initial Screening Levels
RBCA Tier 1 Screening Criteria
Underwood Environmental Consulting, Inc.4 of 5
Groundwater Monitoring Report - October 2024
J Oil #5820
Richfield, UT
Sample ID/
TOC
DATE Depth to
Water (ft)
GW
Elevation
(ft)
MTBE
(mg/L)
Benzene
(mg/L)
Toluene
(mg/L)
Ethyl-
benzene
(mg/L)
Total
Xylenes
(mg/L)
Naphtha-
lene
(mg/L)
TPH
(GRO)
(mg/L)
TPH
(DRO)
(mg/L)
Table 1
Groundwater Analytical Results
J Oil #5820 (Former Premium Oil #8)
Fac. ID #2000222, Release Code GUP
Hi i l G d DMW-A 6/10/2009 13.00 ₋₋<0.002 <0.002 <0.002 <0.002 <0.006 <0.002 <0.50 <0.50
3/11/2010 12.13 ₋₋<0.001 <0.001 <0.001 <0.001 <0.003 <0.002 <0.05 <1
9/2/2010 12.75 ₋₋0.004 <0.001 <0.001 <0.001 <0.003 0.006 <0.05 <1
3/1/2011 14.80 ₋₋<0.002 <0.002 <0.002 <0.002 <0.006 <0.002 <0.05 <0.05
9/8/2011 12.37 ₋₋0.020 <0.002 <0.002 <0.002 <0.006 <0.002 <0.50 <0.05
3/27/2012 13.27 ₋₋<0.001 <0.001 <0.001 <0.001 <0.003 <0.002 <0.05 <1
8/14/2012 12.62 ₋₋0.033 <0.001 <0.001 <0.001 <0.003 <0.002 <0.05 <1
4/10/2013 12.19 ₋₋0.003 <0.001 <0.001 <0.001 <0.003 <0.002 <0.05 <1
10/28/2013 13.39 ₋₋0.037 <0.001 <0.001 <0.001 <0.003 0.003 <0.05 <1
3/14/2014 13.21 ₋₋<0.002 <0.002 0.002 <0.002 <0.006 <0.002 <0.50 <0.50
9/19/2014 12.80 ₋₋0.056 <0.001 <0.005 <0.001 <0.003 <0.005 <0.10 <0.50
9/24/2015 13.81 ₋₋0.247 <0.002 <0.005 <0.002 <0.005 <0.005 0.145 <1.0
1/19/2016 14.57 ₋₋0.031 <0.002 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0
8/19/2016 13.8 --0.248 <0.002 <0.005 <0.002 <0.005 <0.005 0.192 <1.0
12/1/2017 15.78 --0.194 <0.005 <0.012 <0.012 <0.012 <0.012 0.194 <1.0
3/8/2018 15.95 --0.132 <0.005 <0.012 <0.012 <0.012 <0.012 0.132 <1.0
95.27 4/10/2024 16.65 78.62 0.044 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 NA
10/8/2024 16.91 78.36 <0.008 <0.005 <0.012 <0.012 <0.038 <0.012 <0.125 NA
## GW-1 9/14/2015 ----0.168 0.432 2.67 0.692 4.45 0.224 16.9 9.9
0.2 0.005 1 0.7 10 0.7 1 1
0.2 0.3 3 4 10 0.7 10 10
Notes
MTBE - methyl tertiary-butyl ether NA = Not analyzed
TPH-GRO - total petroleum hydrocarbons gasoline range organics
TPH-DRO - total petroleum hydrocarbons diesel range organics
BOLD values indicate levels above Tier 1 Screening Levels (DERR, 2005)
Blue shade - indicates concentrations above ISL's (DERR, 2005)
## - Sample considered not representative due to dissolution from disturbed soil
Initial Screening Levels
Tier 1 Screening Criteria
September 2015 Soil Abatement Event
Underwood Environmental Consulting, Inc.5 of 5
J Oil #5820 (former Premium Oil #8)
305 South Main Street
Richfield, Utah 84701
Facility ID #2000222
00 15 30 6045
approx scale in feet
NORTH
LEGEND
By:
JAM
G Natural Gas Line
Canopy
300 South
Ma
i
n

S
t
r
ee
t
J Oil #5820
(Former Premium Oil
#8 Store)
305 South Main Street
Sidewalk
12
,
0
0
0

D
i
e
s
e
l
12
,
0
0
0

P
r
e
m
i
u
m
15
,
0
0
0

U
n
l
e
a
d
e
d
Residence
Dumpster
Pawn Shop
Concrete Driveway
Gravel Area
Shed
Shed
Current Property Boundary
Over-ExcavationArea
Sewer Lateral
Water Line
MW-2
B-7 Boring
Monitoring Well with groundwater elevation (ft)
Groundwater contour line (contour interval = 0.5 ft)
Groundwater Contour Map
October 8, 2024
FIGURE 1Date:
Oct 17, 202480.5
80.76
G
MW-6
(GP-Y)
Abandoned
MW-6R
MW-2
MW-4
(Removed)
MW-5
(GP-X)
(Removed)
MW-3
(Removed)
MW-3A
MW-5R MW-4R
MW-7B-1
B-2
B-3
B-4
B-5
B-6
B-7
B-8
B-7 B-9
MW-A
MW-1R
MW-1
Abandoned
L
I
C
ENSED P R O F E SSION
A
L
G
E
O
LOGIST
L
I
C
ENSED P R O F E SSION
A
L
G
E
O
LOGIST
JAMES

A
.
McREEL
JAMES

A
.
McREEL
5420854-2250
78.36
79.93
80.73
81.32
80.76
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: 24J0739
Project: J oil #5820 - Richfield
10/15/2024
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 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
Underwood Environmental Consulting
James McReel
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
GUP
10/8/24 16:07 @ 3.4 °C
10/15/2024
J oil #5820 - Richfield
Sample ID: MW-1R
Lab ID: 24J0739-01Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 10/8/24 12:40
Preparation
Date/Time
Sampled By: James McReel
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 10/11/2410/11/240.005 EPA 8260D/5030BNDBenzene
mg/L 10/11/2410/11/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L J-LOW-C10/11/2410/11/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 10/11/2410/11/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 10/11/2410/11/240.012 EPA 8260D/5030BNDToluene
mg/L 10/11/2410/11/240.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 10/11/2410/11/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Project Name: J oil #5820 - Richfield CtF WO#: 24J0739
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
Underwood Environmental Consulting
James McReel
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
GUP
10/8/24 16:07 @ 3.4 °C
10/15/2024
J oil #5820 - Richfield
Sample ID: MW-A
Lab ID: 24J0739-02Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 10/8/24 13:00
Preparation
Date/Time
Sampled By: James McReel
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 10/11/2410/11/240.005 EPA 8260D/5030BNDBenzene
mg/L 10/11/2410/11/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L J-LOW-C10/11/2410/11/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 10/11/2410/11/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 10/11/2410/11/240.012 EPA 8260D/5030BNDToluene
mg/L 10/11/2410/11/240.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 10/11/2410/11/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Project Name: J oil #5820 - Richfield CtF WO#: 24J0739
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
Underwood Environmental Consulting
James McReel
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
GUP
10/8/24 16:07 @ 3.4 °C
10/15/2024
J oil #5820 - Richfield
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
Project Name: J oil #5820 - Richfield CtF WO#: 24J0739
www.ChemtechFord.com
Page 4 of 5Page 4 of 5
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