DERR-2024-005266

Rockwell Solutions, 718 E. Bridger Lane, Elk Ridge, Utah 84651, 801-361-2930, [e-mail]

Rockwell Solutions, Inc.
718 E Bridger Lane
Elk Ridge, UT 84651
[phone]
March 23, 2024

Mark Smith
Triple Stop Chevron
1034 West Gentile Street
Layton, Utah 84041

RE: Peroxide Injection and Groundwater Monitoring Report, March 2024
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah 84041
Facility ID #3000500; Release NUB

Dear Mr. Smith:

Rockwell Solutions, Inc. completed groundwater monitoring activities for the above-referenced release on
February 29 and March 1, 2024. Groundwater samples were collected from sixteen monitoring wells.

Groundwater samples were collected using a disposable bailer, immediately placed on ice, and retained
under chain-of-custody documentation. Samples were analyzed for MTBE, benzene, toluene,
ethylbenzene, total xylenes, naphthalene (MBTEXN) and total petroleum hydrocarbons (TPH) - gasoline
range organics (GRO) using EPA Method 8260B and TPH-diesel range organics (DRO) using EPA
Method 8015B. The analytical reports are attached.

A summary of the historical groundwater monitoring data including groundwater elevation and laboratory
analytical data is presented in Table 1. All concentrations were below Tier 1 levels. Concentrations
exceeded the Initial Screening Levels in samples from MW-1, MW-2, MW-10, MW-27, MW-42, MW-
44, and MW-45 and from extraction well EW-4. Figures 1 and 2 are isoconcentration maps showing the
areas of benzene and TPH-GRO contamination, respectively.

A groundwater elevation map is presented as Figure 3. Groundwater elevations increased an average of
1.08 feet since the sampling event on December 28, 2023. The apparent direction of groundwater flow
across the site on February 29 and March 1, 2024, was to the southwest.

Approximately 4,000 gallons of a hydrogen peroxide solution were injected into select monitoring wells
on March 11-13, 2024. Rockwell Solutions mixed one 264-gallon tote of 34% hydrogen peroxide into a
1,000-gallon water tank to obtain a 8.98% hydrogen peroxide solution. Four 1,000-gallon tanks were
mixed and injected into the following monitoring wells using a pump:

MW-19 MW-42 MW-45
MW-27 MW-44

Peroxide Injection and Groundwater Monitoring Report, March 2024
Triple Stop Chevron, Layton, UT., Facility ID #3000500
2

Rockwell Solutions, 718 E. Bridger Lane, Elk Ridge, Utah 84651, 801-361-2930, [e-mail]

Attempts were made to inject the solution into MW-1 and MW-2, but were unsuccessful. The solution
was added with a five-gallon bucket as quickly as the well allowed.

The solution was injected into the following wells by gravity feed:

MW-1 MW-21 EW-3
MW-2 MW-40 EW-4
MW-10 MW-41

Groundwater samples will be collected in late May or early June to evaluate the site.

If you need additional information or have any questions, please contact me at [phone].

Thank you,

David S. Hansen
Certified UST Consultant CC0130
Rockwell Solutions, Inc.

cc: Kevin Beery, DERR
Figure 1
Triple Stop Chevron
1034 W Gentile Street
Layton, Utah
MW-8
MW-14
MW-5
MW-11
Dissolved Benzene
2/29/23-3/1/23
0.005 < 0.3
MW-9
MW-11EW-4
EW-3
<0.005
0.007
MW-13
MW-31
MW-38 MW-37MW-39
MW-26
MW-12
MW-29 MW-28
MW-32
Monitoring Well
0.189 Benzene (mg/L)
<0.005
<0.005
MW-17
MW-43
MW-34
MW-24 MW-25
<0.005
NORTH
Approx. scale in feet
00 90
Unsampled wells are assumed to have non-detectable concentrations
MW-20
MW-18
MW-35 MW-27
<0.005
MW-16
MW-2
0.006
MW-40
MW-21
<0.005
MW-22
MW-3
<0.005
MW-30
MW-4
<0.005
MW-23
<0.005
MW-44
0.185
MW-19
MW-41
MW-1
0.006
MW-45
0.012
MW-10
0.006
0.012
MW-42
Figure 2
C StoreTank
Basin
Canopy
Motel
Motel
Remediation
Compound
Motel
USTs
C-Store
Canopy
Triple Stop Chevron
1034 W Gentile Street
Layton, Utah
MW-4
MW-3
MW-31
MW-34
MW-38 MW-32 MW-37MW-39
Dissolved TPH -GRO
2/29/23-3/1/23
1.0 < 10 (exceeding Initial Screening Level)
Unsampled wells are assumed to have non-detectable concentrations
0.432 TPH (mg/L)
NORTH
MW-30
MW-8
MW-14
MW-13
MW-10
MW-5
MW-11
MW-22 MW-24
<0.125
MW-9
MW-11
MW-25
MW-26
MW-12
EW-4
EW-3
<0.125
<0.125
<0.125
MW-29
MW-43
MW-41
<0.125
0.238
MW-28
<0.125
5.79
MW-35
<0.125
MW-40
MW-18MW-16
MW-21
MW-2
0.864
MW-20
MW-42
MW-44
0.185
MW-17 <0.125
Approx. scale in feet
00 90
MW-19
<0.125
1.36
MW-27 MW-23
3.34
MW-1
2.55
MW-45
Monitoring Well
Figure 3Approx. scale in feet
00 90
Triple Stop Chevron
1034 W Gentile Street
Layton, Utah
MW-8
MW-5
Groundwater Contours
2/29/2023 - 3/1/2023
MW-9
MW-11
EW-3
MW-34
MW-35 MW-27 MW-22
MW-1
MW-4
MW-2
MW-3
MW-31
MW-24
MW-38 MW-37
MW-20
4322.42
4320.18
MW-44
MW-21
MW-25
MW-26
MW-12
MW-43
MW-29 MW-28
MW-16
MW-17
MW-18
MW-40 4320.25
4319.72
4318.37
MW-10
MW-13
MW-41
4319.14
-
4
3
2
2
-
-
4
3
2
0
-
-
8
431
-
Monitoring Well
(4317.59)= Groundwater Elevation (ft)
= Groundwater Elevation Contour (ft)
NORTH
4318.86
4319.87
4324.13
MW-39
MW-30
4318.37
MW-14
4323.63
MW-32
4317.06
4318.78
MW-42
1
-
4
3
2
-
-43
1
9-
-
3
7-
4
1
-4
316-
-
4
3
2
3
-
EW-4
MW-23
MW-45
4319.88
4319.02
MW-19
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
MW-1 02/26/19 1.3 17.6 10.60 1.28 <0.005 0.101 0.416 1.63 NM NM 4319.73
4330.19 03/15/19 1.1 7.67 3.06 0.377 <0.005 0.037 0.595 1.41 0.00 9.77 4319.73
09/04/19 1.06 18.00 6.70 0.551 <0.00100 0.0440 2.41 3.18 0.00 10.46 4319.73
09/26/19 1.73 11.00 5.63 0.475 <0.100 <0.100 2.06 2.53 0.00 10.60 4319.59
01/06/20 0.912 25.50 4.38 0.578 <0.100 0.0773 2.08 3.28 0.00 10.71 4319.48
04/01/20 0.440 <100 1.08 0.167 <0.200 <1.00 0.337 0.688 0.00 10.45 4319.74
10/29/20 0.737 15.10 3.59 0.484 <0.002 0.0385 2.040 2.110 0.00 11.20 4318.99
01/27/21 1.10 13.1 2.84 0.565 <0.0250 0.0451 0.463 1.75 0.00 11.53 4318.66
04/07/21 1.50 2.79 2.89 0.0644 <0.00500 0.00837 1.12 0.396 0.00 10.99 4319.20
07/15/21 1.17 132 4.24 0.781 <0.200 <1.00 1.3 5.58 0.00 11.27 4318.92
10/06/2021 0.784 7.68 1.86 0.386 <0.0250 0.073 0.253 2.27 0.00 11.46 4318.73
1/12/2022 0.305 <12.5 0.244 0.207 <0.0250 <0.125 0.0362 0.686 0.00 10.67 4319.52
4/27/2022 <1 1.64 0.322 0.131 <0.005 0.01 0.072 0.395 0.00 10.87 4319.32
7/18/2022 2.3 1.100 0.213 0.136 <0.005 0.014 0.043 0.273 0.00 11.26 4318.93
10/19/2022 1.6 0.438 0.053 0.026 <0.005 0.018 <0.012 <0.012 0.00 11.60 4318.59
1/30/2023 1.0 1.35 0.030 0.145 <0.005 0.026 0.018 0.43 0.00 10.15 4320.04
4/21/2023 1.7 4.74 0.097 0.032 <0.005 0.233 1.540 0.034 0.00 8.76 4321.43
8/25/2023 1.7 1.90 0.063 0.209 <0.005 0.023 0.012 0.439 0.00 10.63 4319.56
4330.31 12/28/2023 1.5 2.07 0.011 0.323 <0.005 0.025 0.088 0.657 0.00 11.18 4319.13
3/1/2024 1.6 3.34 0.006 0.347 <0.005 0.034 0.033 1.07 0.00 10.13 4320.18
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
Page 1 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-2 02/26/19 <1.0 6.95 4.74 <0.012 <0.005 0.053 <0.012 0.106 NM NM 4319.91
4330.01 03/15/19 <1.0 2.4 1.24 0.03 <0.005 0.028 0.018 0.086 0.00 10.10 4319.91
09/04/19 <0.100 0.430 0.02 0.00398 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.58 4319.43
01/06/20 0.0807 1.760 0.33 0.0522 <0.00100 0.00473 0.000562 0.0182 0.00 10.92 4319.09
04/01/20 0.383 4.480 0.76 0.132 <0.0100 0.0309 0.0134 0.6320 0.00 10.65 4319.36
10/29/20 0.636 9.050 1.12 0.370 <0.001 0.0532 0.0226 1.2 0.00 11.28 4318.73
01/27/21 0.139 2.92 0.282 0.115 <0.0100 <0.0500 0.3220 0.584 0.00 11.61 4318.40
04/07/21 0.418 1.45 0.264 0.0441 <0.0100 <0.0500 0.0102 0.121 0.00 11.10 4318.91
07/15/21 <0.100 0.575 0.00204 0.000733 <0.00100 <0.00500 <0.00100 0.000697 0.00 11.27 4318.74
10/06/2021 0.403 7.67 0.527 0.307 <0.0100 0.0492 0.0519 2.32 0.00 11.49 4318.52
1/12/2022 <0.100 <5.0 0.0777 0.108 <0.0100 <0.0500 0.0145 0.333 0.00 10.98 4319.03
4/27/2022 <1 <0.125 0.01 0.02 <0.005 <0.012 <0.012 0.014 0.00 11.08 4318.93
7/18/2022 <1 <0.125 0.008 0.008 <0.005 <0.012 <0.012 <0.012 0.00 11.27 4318.74
10/19/2022 <1 0.363 0.212 0.021 <0.005 <0.012 0.015 0.115 0.00 11.59 12963.29
1/30/2023 1.10 2.33 0.206 0.117 <0.005 0.0280 0.030 1.340 0.00 10.33 4319.68
4/21/2023 <1.0 0.818 0.015 <0.012 <0.005 0.1430 0.170 <0.012 0.00 9.14 4320.87
8/25/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.72 4319.29
4330.14 12/28/2023 <1.0 <0.125 <0.005 0.025 <0.005 <0.012 <0.012 <0.012 0.00 11.40 4318.74
3/1/2024 <1 0.864 0.006 0.122 <0.005 0.02 0.01 0.45 0.00 10.42 4319.72
Page 2 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-3*03/15/19 <1.0 2.71 0.550 0.073 <0.005 <0.012 0.027 0.813 0.00 9.51 4319.78
MW-3 03/19/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.72 4320.57
4329.29 09/04/19 <0.100 0.327 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 0.00 9.74 4319.55
01/06/20 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 0.00 9.84 4319.45
04/01/20 <0.100 <0.500 0.00168 <0.00100 <0.00100 <0.00500 <0.00100 <0.00100 0.00 9.54 4319.75
7/18/2022 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.57 4318.72
10/19/2022 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 11.91 4317.38
1/30/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.32 4319.97
MW-4*03/15/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.83 4321.22
MW-4 03/19/19 <1.0 1.23 0.2560 0.020 <0.005 <0.012 <0.012 0.302 0.00 9.40 4320.65
4330.05 09/04/19 <0.100 0.351 0.0050 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 0.00 10.35 4319.70
01/06/20 <0.100 1.680 0.3350 0.00165 <0.00100 <0.00100 0.0149 0.0103 0.00 10.56 4319.49
04/01/20 <0.100 0.259 0.09860 <0.00100 <0.00100 <0.00500 0.00319 <0.00300 0.00 10.22 4319.83
10/29/20 <0.100 0.0598 0.0110 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 11.00 4319.05
01/27/21 <0.100 <0.500 0.00222 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 11.37 4318.68
04/07/21 0.0421 <0.500 0.0101 <0.00100 <0.00100 <0.00500 <0.00100 0.000772 0.00 10.80 4319.25
07/15/21 <0.100 <0.500 0.00301 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 11.13 4318.92
10/06/2021 <0.100 1 0.237 0.00154 <0.00100 <0.00500 0.00752 0.0413 0.00 11.32 4318.73
1/11/2022 0.695 2.3 0.446 0.0118 <0.005 0.0145 0.00203 0.24 0.00 10.67 4319.38
7/18/2022 <1 <0.125 0.013 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 11.20 4318.85
10/19/2022 <1 <0.125 0.013 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 11.49 4318.56
1/30/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.96 4320.09
4/21/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.42 4321.63
8/25/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.54 4319.51
12/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.87 4319.18
2/29/2024 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.80 4320.25
MW-5 03/15/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.65 4325.22
4333.87 01/13/22 <0.100 <0.5 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.93 4322.94
Page 3 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-6
4334.12 03/15/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.50 4325.62
MW-7
4333.96 03/15/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.51 4325.45
MW-8 03/15/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.07 4325.81
4334.88 09/04/19 <0.100 0.33 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 0.00 10.31 4324.57
01/06/20 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 0.00 10.16 4324.72
03/31/20 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 0.00 9.96 4324.92
10/29/20 <0.0247 <0.100 <0.00100 <0.00100 <0.0001 0.00101 <0.00100 <0.00300 0.00 10.96 4323.92
01/27/21 <0.100 <0.500 0.000136 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 11.04 4323.84
04/08/21 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.49 4324.39
07/13/21 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.90 4323.98
10/07/2021 <0.100 <0.500 <0.00100 <0.00100 <0.00100 0.0171 <0.00100 <0.00300 0.00 11.26 4323.62
1/13/2022 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.37 4324.51
MW-9 03/15/19 0.0379 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.95 4325.62
4334.57 7/19/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 11.00 4323.57
10/18/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 11.52 4323.05
1/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.52 4325.05
Page 4 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-10 03/12/19 13.2 33.1 9.32 1.12 <0.005 0.221 4.65 7.72 0.09 10.10 4324.43
4334.46 03/15/19 11.8 78.0 14.5 2.32 <0.005 0.394 25.1 18.1 0.00 10.00 4324.46
03/20/19 13.3 68.7 13.8 2.13 <0.100 0.598 17.9 16.2 0.00 9.98 4324.48
04/08/21 10.8 23.1 0.0662 0.119 <0.050 0.177 0.710 6.88 0.00 12.10 4322.36
10/08/2021 1.68 10.8 0.0741 0.309 <0.0500 0.153 1.64 4.36 0.01 12.86 4321.61
01/12/22 2.87 29 <0.05 0.571 <0.0500 0.174 0.802 9.83 0.01 12.01 4322.46
6/10/2022 5.5 10.1 <0.005 <0.012 <0.005 0.033 0.107 3.34 0.00 NM
7/19/2022 <1.0 0.42 <0.005 <0.012 <0.005 <0.012 <0.012 0.152 0.00 12.42 4322.04
10/18/2022 <1.0 0.29 <0.005 <0.012 <0.005 <0.012 <0.012 0.076 0.00 12.77 4321.69
1/28/2023 1.6 0.439 <0.005 <0.012 <0.005 <0.012 <0.012 0.121 0.00 10.92 4323.54
4/21/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.73 4324.73
8/25/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 0.111 0.00 11.82 4322.64
12/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 0.014 0.00 12.06 4322.40
2/29/2024 3.1 5.79 0.006 0.040 <0.005 0.028 <0.012 2.160 0.00 10.83 4323.63
MW-11 03/15/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.16 4325.53
4334.69 01/11/22 <0.100 <0.500 0.000125 <0.00100 <0.00100 <0.005 0.000429 0.000440 0.00 9.16 4325.53
MW-12 02/27/19 <1.0 4.54 0.32 0.019 <0.005 <0.012 0.125 0.069 NM NM --
4332.49 03/15/19 <1.0 4.92 0.1580 0.012 <0.005 <0.012 0.082 0.044 0.00 7.46 4325.03
09/05/19 0.0562 2.11 0.0746 0.00274 <0.00100 <0.00500 0.00673 0.0107 0.00 10.57 4321.92
01/08/20 <0.100 0.193 0.0076 <0.00100 <0.00100 <0.00500 <0.00100 0.00110 0.00 9.49 4323.00
03/31/20 <0.100 0.159 0.0036 <0.00100 <0.00100 <0.00500 <0.00100 0.00172 0.00 9.23 4323.26
7/19/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.23 4322.26
10/18/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.59 4321.90
1/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.42 4324.07
Page 5 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-13 02/27/19 4.4 19.0 4.980 1.06 <0.200 <0.500 4.57 8.38 NM NM 4324.82
4332.82 03/15/19 2.1 10.7 2.29 0.464 <0.005 0.039 1.27 3.06 0.00 8.00 4324.82
03/20/18 2.9 17.0 3.020 0.635 <0.005 0.045 1.97 4.42 0.00 8.01 4324.81
09/05/19 2.5 57.3 2.530 1.53 <0.00100 0.171 1.47 11.50 0.00 9.88 4322.94
01/08/20 0.655 4.09 0.225 0.133 <0.100 0.0298 0.0127 0.756 0.00 10.02 4322.80
03/31/20 1.270 4.38 0.402 0.220 <0.0100 0.0383 0.0317 1.340 0.00 9.78 4323.04
10/29/20 0.762 4.19 0.532 0.191 <0.001 0.0688 0.0573 0.876 0.00 10.53 4322.29
01/27/21 0.146 <0.500 0.00343 0.00280 <0.001 0.00195 <0.00100 0.00209 0.00 10.56 4322.26
04/08/21 0.267 0.272 0.00200 0.00305 <0.00100 <0.00500 <0.00100 0.000462 0.00 10.12 4322.70
07/13/21 1.6 8.52 0.00349 0.524 <0.00100 0.0881 0.091 3.88 0.00 10.39 4322.43
10/08/2021 3.35 9.96 0.0144 0.771 <0.0500 0.146 0.214 4.03 0.00 10.81 4322.01
1/12/2022 0.153 0.739 0.000456 0.0297 <0.001 0.00251 <0.00100 0.0122 0.00
7/19/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.77 4322.05
10/18/2022 <1 0.224 <0.005 <0.012 <0.005 <0.012 <0.012 0.029 0.00 10.93 4321.89
1/28/2023 <1.0 0.133 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.92 4323.90
Page 6 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-14 02/27/19 3.3 13.5 2.090 0.511 <0.005 0.046 0.804 3.44 NM NM --
4332.86 03/15/19 2.5 9.21 1.16 0.365 <0.005 0.039 0.765 2.56 0.00 8.77 4324.09
03/20/19 2.1 11.0 2.380 0.341 <0.005 0.034 1.44 2.43 0.00 8.77 4324.09
09/05/19 0.415 6.3 0.798 0.082 <0.00100 0.0204 0.485 0.428 0.00 10.22 4322.64
01/08/20 <0.100 1.02 0.018 0.00143 <0.00100 <0.00500 0.000857 0.00136 0.00 10.30 4322.56
03/31/20 <0.100 0.811 0.032 0.00282 <0.00100 <0.00100 0.00119 0.00383 0.00 10.05 4322.81
10/29/20 <0.247 0.375 0.000960 0.00019 <0.0001 <0.0050 <0.00100 0.00048 0.00 11.01 4321.85
01/27/21 <0.100 <0.500 0.000308 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 11.25 4321.61
04/08/21 0.0247 0.292 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.71 4322.15
07/13/21 0.0601 0.596 <0.00100 <0.00100 <0.00100 0.00242 <0.00100 <0.00300 0.00 10.90 4321.96
10/08/2021 <0.100 <0.500 0.000383 <0.00100 <0.00100 0.013 <0.00100 <0.00300 0.00 11.24 4321.62
1/12/2022 <0.100 <0.500 0.000169 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00
7/19/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 11.16 4321.70
10/18/2022 NS NS NS NS NS NS NS NS DRY
1/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.69 4323.17
MW-15 02/27/19 <1.0 3.28 0.3180 <0.012 <0.005 <0.012 <0.012 0.0130 NM NM --
4333.42 03/15/19 <1.0 0.334 0.038 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.43 4323.99
09/05/19 <0.100 0.217 0.0018 <0.00100 <0.00100 <0..00500 <0.00100 <0.00300 0.00 10.56 4322.86
01/08/20 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0..00500 <0.00100 <0.00300 0.00 10.60 4322.82
03/31/20 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0..00500 <0.00100 <0.00300 0.00 10.37 4323.05
MW-16 03/15/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.10 4318.11
4328.21 09/04/19 <0.100 0.323 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.30 4317.91
01/06/20 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 11.02 4317.19
04/01/20 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.71 4317.50
01/11/22 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.88 4317.33
MW-17
4327.91 03/15/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.62 4318.29
MW-18 03/15/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.12 4318.62
Page 7 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
4327.74 09/04/19 <0.100 0.324 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 9.45 4318.29
01/06/20 <0.100 <0.500 0.00159 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.01 4317.73
04/01/20 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 9.71 4318.03
04/07/21 0.0531 0.150 0.0181 <0.00100 0.000169 <0.00100 <0.00100 0.00117 0.00 10.26 4317.48
07/15/21 <0.100 <0.500 0.00731 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.26 4317.48
10/06/2021 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.51 4317.23
1/11/2022 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.00 4317.74
Page 8 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-19 03/15/19 <1.0 6.29 4.23 0.423 <0.005 0.040 0.085 0.333 0.00 8.05 4319.07
4327.12 09/04/19 1.47 10.30 8.130 0.81 <0.00100 0.0548 0.0589 0.0589 0.00 8.46 4318.66
09/27/19 1.68 12.50 9.700 0.746 <0.0400 0.0862 0.0464 1.51 0.00 8.61 4318.51
01/07/20 0.198 4.56 2.140 0.0558 <0.00100 0.00401 0.00165 <0.00300 0.00 8.83 4318.29
04/01/20 0.559 14.20 4.580 0.3720 <0.00500 <0.250 <0.0500 0.0569 0.00 8.59 4318.53
10/29/20 0.371 5.59 1.190 0.2240 <0.005 <0.05 0.08530 0.517 0.00 9.23 4317.89
01/27/21 0.313 1.47 0.340 0.156 <0.0100 <0.0500 0.00886 0.00742 0.00 9.66 4317.46
04/07/21 2.04 36.4 3.98 0.998 <0.00500 0.0521 4.06 4.22 0.00 9.10 4318.02
07/14/21 1.09 48.3 5.31 0.938 <0.0500 0.0731 0.526 3.18 0.00 9.24 4317.88
10/06/2021 0.861 11.6 3.04 0.593 <0.0100 0.0762 0.319 1.5 0.00 9.48 4317.64
1/12/2022 1.06 22.2 3.92 0.791 <0.025 0.0851 0.511 3.85 0.00
4/27/2022 1.7 8.3 1.84 0.541 <0.005 0.063 0.243 2.61 0.00 9.00 4318.12
5/12/2022 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 NM
7/19/2022 1.7 0.67 0.097 0.03 <0.005 0.02 <0.012 0.162 0.00 9.22 4317.90
10/19/2022 <1.0 0.568 0.106 0.06 <0.005 <0.012 <0.012 0.200 0.00 9.60 4317.52
1/30/2023 <1.0 <0.125 0.02 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.25 4318.87
4/21/2023 <1.0 0.42 <0.005 <0.012 <0.005 <0.012 <0.012 0.151 0.00 7.03 4320.09
8/25/2023 2.7 1.29 0.163 0.235 <0.005 0.084 0.0170 0.322 0.00 8.63 4318.49
4327.24 12/28/2023 <1.0 0.312 0.028 0.025 <0.005 <0.012 <0.012 0.094 0.00 9.22 4318.02
3/1/2024 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.22 4319.02
Page 9 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-20 03/15/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.75 4318.61
4327.36 04/07/21 0.0686 3.36 1.43 0.0210 <0.0100 0.00222 0.0127 0.0169 0.00 9.72 4317.64
07/14/21 0.268 15.9 1.82 0.161 <0.0200 0.0359 0.136 0.0888 0.00 9.76 4317.60
10/06/2021 0.117 0.598 0.132 0.0868 <0.00100 0.00653 0.00223 0.00159 0.00 10.02 4317.34
1/11/2022 <0.100 0.136 0.00188 0.000185 <0.00100 <0.005 <0.001 <0.003 0.00 9.49 4317.87
4/27/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.56 4317.80
7/18/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.75 4317.61
10/19/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.10 4317.26
1/30/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.89 4318.47
MW-21 03/15/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.55 4318.77
4328.32 09/04/19 <0.100 0.361 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 9.73 4318.59
01/06/20 0.19 <0.500 0.00065 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.35 4317.97
04/01/20 <0.100 <0.500 0.00756 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.09 4318.23
7/18/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.49 4317.83
10/19/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.47 4317.85
1/30/2023 <1.0 <0.125 0.007 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.67 4318.65
4/21/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.45 4319.87
8/25/2023 <1.0 <0.125 0.049 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.90 4318.42
4328.44 12/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.62 4317.82
2/29/2024 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.58 4318.86
Page 10 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-22 02/27/19 6.7 41.4 6.32 2.12 <0.200 <0.500 10.4 16.9 NM NM --
4333.90 03/20/19 1.1 2.35 0.42 0.116 <0.005 0.016 0.182 0.665 0.00 11.60 4322.30
09/04/19 1.08 7.40 0.25 0.180 <0.00100 0.0286 0.462 1.280 0.00 12.70 4321.20
01/07/20 1.85 29.50 6.81 1.11 <0.00100 0.144 1.06 2.06 0.00 12.83 4321.07
03/31/20 1.45 15.90 3.62 0.495 <0.100 <0.500 1.58 2.08 0.00 12.59 4321.31
10/29/20 0.394 3.09 0.12 0.136 <0.0001 0.02 0.0212 0.366 0.00 13.29 4320.61
04/08/21 0.664 0.997 0.00627 0.0408 <0.00100 0.00714 0.0212 0.134 0.00 13.08 4320.82
07/16/21 0.207 1.46 0.00458 0.0328 <0.00100 0.00335 0.00405 0.0429 0.00 13.35 4320.55
10/07/2021 0.0847 0.342 0.00327 0.00528 <0.00100 0.00205 0.00103 0.00749 0.00 13.58 4320.32
1/13/2022 <0.1 <0.500 0.00138 0.00225 <0.00100 <0.500 0.000729 0.0064 0.00 4333.90
4/27/2022 <1 0.52 <0.005 <0.012 <0.005 <0.012 <0.012 0.032 0.00 13.00 4320.90
7/19/2022 <1 0.826 <0.005 0.044 <0.005 <0.012 <0.012 0.208 0.00 13.36 4320.54
10/18/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 13.74 4320.16
1/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 12.22 4321.68
Page 11 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-23 02/27/19 5.2 21.5 5.850 1.09 <0.005 <0.012 5.96 8.56 NM NM --
4333.67 03/20/19 <1.0 1.02 0.184 0.048 <0.005 <0.012 0.231 0.270 0.00 11.90 4321.77
09/26/19 0.917 1.96 0.728 0.143 <0.00200 0.0668 0.417 0.382 0.00 11.92 4321.75
01/08/20 0.311 6.26 1.180 0.188 <0.00100 <0.00100 0.0602 0.412 0.00 13.02 4320.65
03/31/20 0.363 8.90 2.24 0.177 <0.0250 <0.125 0.971 0.538 0.00 12.75 4320.92
10/29/20 <0.100 0.404 0.0151 0.0232 <0.0001 0.00374 0.00058 0.00752 0.00 13.36 4320.31
01/28/21 <0.100 <0.500 0.000372 0.0014 <0.00100 <0.00500 <0.00100 0.000610 0.00 13.72 4319.95
04/08/21 0.260 0.437 0.00889 0.0266 <0.00100 0.00190 0.000575 0.0450 0.00 13.23 4320.44
07/16/21 0.453 15.7 0.0359 0.224 <0.0250 <0.125 <0.0250 0.565 0.00 13.45 4320.22
10/07/2021 0.0533 0.116 0.00368 0.0272 <0.00100 0.00168 <0.00100 0.00234 0.00 13.69 4319.98
1/13/2022 <0.100 0.282 0.000248 0.00302 <0.00100 <0.00500 <0.00100 0.00227 0.00
Page 12 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-24 03/20/19 4.9 18.6 5.420 0.942 <0.005 0.132 0.233 7.11 0.00 9.98 4323.34
4333.32 09/04/19 0.0394 0.390 0.005 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 11.61 4321.71
01/07/20 1.35 20.3 7.860 1.27 <0.00100 0.0705 0.0304 1.18 0.00 11.66 4321.66
03/31/20 1.10 <12.5 0.853 0.258 <0.0250 0.0309 0.0161 0.754 0.00 11.42 4321.90
10/29/20 2.6 36.6 4.320 0.506 <0.002 0.0942 0.32 5.660 0.00 12.22 4321.10
02/04/21 4.2 19.6 2.940 0.717 <0.0250 0.120 0.241 4.28 0.00 12.35 4320.97
04/08/21 5.96 7.15 0.374 0.0891 <0.0250 0.0379 0.0152 0.445 0.00 11.98 4321.34
07/13/21 1.07 16.8 0.569 0.206 <0.0250 0.028 0.0533 0.708 0.00 12.22 4321.10
10/7/2021 _3.69 0.0438 0.548 <0.0250 0.0649 0.0212 1.70 0.00 12.51 4320.81
1/13/2022 1.00 <12.5 0.0119 0.00654 <0.0250 <0.125 <0.0250 0.0696 0.00 12.51 4320.81
7/19/2022 <1 0.162 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 12.28 4321.04
10/18/2022 2.3 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 12.72 4320.60
1/28/2023 <1.0 <0.125 0.007 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 11.00 4322.32
4/21/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.45 4323.87
8/25/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 11.76 4321.56
12/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 0.098 0.00 12.02 4321.30
2/29/2024 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.90 4322.42
MW-25 03/20/19 1.5 5.53 1.25 0.298 <0.005 0.028 0.243 2.06 0.00 9.01 4323.90
4332.91 09/04/19 <0.100 0.351 0.000668 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.88 4322.03
01/07/20 <0.100 <0.500 0.00182 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.94 4321.97
03/31/20 <0.100 <0.500 0.00136 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.68 4322.23
04/08/21 0.0501 <0.500 0.000130 0.00348 <0.00100 <0.00500 0.000415 0.00809 0.00 11.21 4321.70
7/19/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 11.49 4321.42
10/18/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 12.04 4320.87
1/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.16 4322.75
Page 13 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-26 03/19/19 <1.0 0.991 0.127 <0.012 <0.005 <0.012 0.012 0.033 0.00 8.31 4324.36
4332.67 7/19/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 11.02 4321.65
10/18/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 11.47 4321.20
1/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.33 4323.34
MW-27 03/20/19 <1.0 1.44 0.2810 0.056 <0.005 <0.012 0.618 0.334 0.00 13.37 4319.95
4333.32 7/19/2022 1.3 4.72 0.2030 0.259 <0.005 0.029 1.010 2.050 0.00 14.25 4319.07
10/18/2022 <1.0 0.55 <0.005 0.017 <0.005 <0.012 <0.012 0.288 0.00 14.58 4318.74
1/28/2023 <1.0 0.46 0.012 0.060 <0.005 <0.012 0.058 0.184 0.00 13.67 4319.65
4/21/2023 <1.0 1.58 0.029 <0.012 <0.005 <0.012 0.104 1.120 0.00 12.63 4320.69
8/25/2023 1.20 4.54 0.103 0.336 <0.005 0.036 1.230 1.980 0.00 13.83 4319.49
12/28/2023 <1.0 2.24 <0.005 0.125 <0.005 0.026 0.116 0.963 0.00 14.22 4319.10
2/29/2024 <1 1.36 <0.005 0.103 <0.005 0.017 0.323 0.540 0.00 13.45 4319.87
MW-28 03/20/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 NM NM --
MW-29 03/20/19 <1.0 <0.125 0.1200 <0.012 <0.005 <0.012 <0.012 <0.012 NM NM --
4326.35 4/27/2022 <1 <0.125 0.014 <0.012 <0.005 <0.012 <0.012 <0.012 NM 9.68 4316.67
7/18/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 NM 9.76 4316.59
10/19/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 NM 10.16 4316.19
1/30/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.77 4317.58
Page 14 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-30 03/20/19 <1.0 0.978 0.8200 0.076 <0.005 <0.012 0.014 0.068 NM --
4326.86 09/04/19 0.0784 0.516 0.1390 0.0584 <0.00100 <0.0050 <0.00100 <0.00100 0.00 8.88 4317.98
01/07/20 <0.100 <0.500 0.0098 <0.00100 <0.00100 <0.0050 <0.00100 <0.00300 0.00 9.28 4317.58
04/01/20 <0.100 <0.500 0.00348 <0.00100 <0.00100 <0.0050 <0.00100 <0.00300 0.00 9.03 4317.83
10/29/20 <0.0247 0.0932 0.02040 <0.00100 <0.0001 <0.0050 <0.00100 <0.00300 0.00 9.68 4317.18
01/27/21 <0.100 <0.500 0.000131 <0.00100 <0.00100 <0.00500 <0.00100 0.003000 0.00 10.15 4316.71
04/07/21 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 0.003000 0.00 9.62 4317.24
07/15/21 0.0295 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 9.71 4317.15
10/06/2021 <0.100 <0.500 0.0253 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 9.93 4316.93
1/12/2022 0.0406 2.74 0.938 0.0022 <0.00100 <0.00500 0.00249 0.0205 0.00
4/27/2022 <1 0.292 0.162 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.51 4317.35
5/12/2022 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 NM
7/18/2022 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.67 4317.19
10/19/2022 <1.0 <0.125 0.063 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.07 4316.79
1/30/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.63 4318.23
4/21/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 7.36 4319.50
8/25/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.08 4317.78
12/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.62 4317.24
3/1/2024 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.49 4318.37
Page 15 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-31 03/27/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.36 4317.50
4325.86 09/04/19 <0.100 0.34 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 0.00 8.85 4317.01
01/06/20 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 0.00 9.42 4316.44
04/01/20 <0.100 0.134 0.0342 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 0.00 9.13 4316.73
10/29/20 <0.02 0.385 0.3850 <0.00100 <0.0001 <0.00100 <0.00100 <0.00100 0.00 9.70 4316.16
01/27/21 <0.100 0.836 0.2480 0.00355 <0.00100 <0.00500 <0.00100 0.000244 0.00 10.23 4315.63
04/07/21 0.0609 1.030 0.3540 0.000428 0.000123 <0.00500 <0.00100 0.000794 0.00 9.74 4316.12
07/14/21 0.0297 0.709 0.0260 0.00074 0.000248 <0.00500 <0.00100 0.00146 0.00 9.66 4316.20
10/04/2021 <0.100 <0.500 0.00126 0.00148 0.000205 0.00195 <0.00100 0.000354 0.00 9.87 4315.99
1/11/2022 <0.100 0.757 0.432 <0.00100 <0.00100 <0.00500 <0.00100 0.000605 0.00 9.38 4316.48
4/27/2022 <1 3.68 2.77 0.234 <0.005 <0.012 0.036 0.000605 0.00 9.63 4316.23
5/12/2022 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 NM
7/19/2022 <1.0 0.33 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.55 4316.31
10/19/2022 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.98 4315.88
1/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.64 4317.22
Page 16 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-32 03/27/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.74 4317.15
4325.89 01/27/21 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.61 4315.28
04/07/21 0.0383 <0.500 0.00011 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.15 4315.74
07/14/21 <0.100 <0.500 <0.00100 <0.00100 0.000175 <0.00500 <0.00100 0.00037 0.00 10.04 4315.85
10/04/2021 <0.100 <0.500 <0.00100 <0.00100 0.000194 <0.00500 <0.00100 <0.00300 0.00 10.23 4315.66
1/11/2022 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 9.79 4316.10
4/27/2022 <1 <0.125 0.007 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.01 4315.88
7/18/2022 <1 <0.125 0.075 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.93 4315.96
10/18/2022 <1 <0.125 0.038 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.35 4315.54
1/30/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.99 4316.90
4/21/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 7.73 4318.16
8/25/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.13 4316.76
12/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.08 4315.81
2/29/2024 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.83 4317.06
MW-33
4332.19 03/27/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.06 4324.93
MW-34 03/27/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 NM NM -
4331.78 09/04/19 <0.100 0.336 0.00253 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.48 4321.30
01/07/20 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.45 4321.33
03/31/20 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.19 4321.59
01/13/22 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 0.000353 0.000458 0.00 4331.78
Page 17 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-35 04/02/19 <1.0 1.84 0.9270 <0.012 <0.005 0.017 0.078 0.258 NM NM --
4332.19 09/04/19 0.262 5.81 1.5200 0.0931 <0.00100 0.0121 0.140 0.558 0.00 13.37 4318.82
01/08/20 0.161 4.70 1.0600 0.0735 <0.00100 0.0255 0.199 0.203 0.00 13.72 4318.47
03/31/20 0.0710 0.62 0.0789 0.0292 <0.00100 0.0125 0.00267 0.0673 0.00 13.44 4318.75
07/16/21 <0.100 <0.500 0.0000966 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 4332.19
10/07/2021 <0.100 <0.500 0.000434 0.00117 <0.00100 0.00385 <0.00100 0.000651 0.00 14.00 4318.19
1/13/2022 <0.100 0.21 0.00215 0.0115 <0.00100 0.00713 0.000904 0.0815 0.00 4332.19
MW-36 04/02/19 <1.0 <0.125 0.026 <0.012 <0.005 <0.012 <0.012 <0.012 NM NM -
4333.26 09/04/19 <0.100 1.31 0.193 <0.00100 <0.00100 <0.00500 <0.00100 0.00352 0.00 11.60 4321.66
01/07/20 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 11.74 4321.52
03/31/20 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 11.50 4321.76
Page 18 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-37 04/02/19 <1.0 <0.125 0.0860 <0.012 <0.005 <0.012 <0.012 <0.012 NM NM -
4326.48 09/04/19 <0.105 0.334 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 0.00 9.58 4316.90
01/06/20 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 0.00 10.10 4316.38
04/01/20 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 0.00 9.84 4316.64
10/29/20 <0.0329 <0.100 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 0.00 10.36 4316.12
01/27/21 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.79 4315.69
04/07/21 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.40 4316.08
07/14/21 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.37 4316.11
10/04/2021 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.53 4315.95
1/11/2022 <0.100 <0.500 <0.00100 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.11 4316.37
7/18/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.31 4316.17
10/18/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.65 4315.83
1/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.33 4317.15
MW-38 07/15/21 <0.100 <0.500 0.000262 <0.00100 0.000402 <0.00500 <0.00100 0.000332 0.00 10.32 4315.53
4325.85 10/04/2021 <0.100 <0.500 <0.00100 <0.00100 0.000765 <0.00500 <0.00100 0.000397 0.00 10.55 4315.30
1/11/2022 <0.100 <0.500 <0.00100 <0.00100 0.000217 <0.00500 <0.00100 0.000222 0.00 10.04 4315.81
5/12/2022 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 NM
7/18/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.15 4315.70
10/19/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.62 4315.23
1/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.34 4316.51
Page 19 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-39 07/15/21 <0.100 <0.500 0.000285 <0.00100 <0.00100 <0.00500 <0.00100 <0.00300 0.00 10.20 4315.29
4325.49 10/04/2021 <0.100 <0.500 <0.00100 <0.00100 0.000286 <0.00500 <0.00100 <0.00300 0.00 10.46 4315.03
1/11/2022 <0.100 <0.500 <0.00100 <0.00100 0.0002 <0.00500 <0.00100 <0.00300 0.00 10.02 4315.47
7/18/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.00 4315.49
10/18/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.50 4314.99
1/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.36 4316.13
MW-40 10/07/2021 0.0794 1.11 0.191 0.064 <0.00100 0.0134 0.0230 0.245 0.00 9.35 4318.12
4327.47 1/12/2022 0.299 4.16 0.591 0.301 <0.00100 0.0311 0.0403 0.713 0.00 4327.47
4/27/2022 <1 0.595 0.038 0.042 <0.005 <0.012 <0.012 0.043 0.00 9.77 4317.70
5/12/2022 <1 0.666 0.103 0.013 <0.005 0.016 0.013 0.235 0.00 NM
7/18/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.11 4318.36
10/20/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.45 4318.02
1/30/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.09 4319.38
MW-41 10/07/2021 <0.200 0.135 0.0346 0.00186 <0.00100 0.0283 0.000321 0.00284 0.00 11.15 4317.68
4328.83 1/12/2022 0.104 2.31 0.948 0.00063 <0.0001 0.00914 0.00326 0.0374 0.00 4328.83
4/27/2022 <1 <0.125 0.017 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.64 4318.19
5/12/2022 <1 0.146 0.146 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 NM
7/18/2022 1.6 3.97 0.780 <0.012 <0.005 <0.012 <0.012 0.19 0.00 10.92 4317.91
10/20/2022 <1 0.565 0.071 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 11.48 4317.35
1/30/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.85 4318.98
4/21/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.41 4320.42
8/25/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.30 4318.53
12/2/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.73 4318.10
2/29/2024 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.69 4319.14
Page 20 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-42 10/07/2021 0.610 13.3 6.57 0.576 <0.00100 0.0593 1.06 1.62 0.00 9.90 4316.94
4326.84 1/12/2022 0.292 <100 3.07 0.384 <0.20 <1.0 0.114 0.203 0.00 4326.84
4/27/2022 1.400 7.76 4.28 0.442 <0.005 0.063 0.245 1.3 0.00 9.49 4317.35
5/12/2022 <1 1.32 0.854 0.025 <0.005 0.016 0.043 0.174 0.00 NM
6/10/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 NM
7/19/2022 1.3 6.48 2.36 0.29 <0.005 0.062 0.065 0.609 0.00 9.61 4317.23
10/19/2022 <1 <0.125 0.101 0.014 <0.005 <0.012 <0.012 <0.012 0.00 10.00 4316.84
1/30/2023 <1.0 0.259 0.203 0.027 <0.005 <0.012 <0.012 0.029 0.00 8.68 4318.16
4/21/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 7.49 4319.35
8/25/2023 1.6 1.1 0.476 0.176 <0.005 0.013 <0.012 0.048 0.00 9.02 4317.82
4326.97 12/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.68 4317.29
3/1/2024 <1 <0.125 0.012 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.60 4318.37
MW-43 4/27/2022 <1 <0.125 0.022 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 NM
4326.93 5/12/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 NM
7/19/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.12 4316.81
10/19/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.52 4316.41
1/30/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.13 4317.80
Page 21 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
MW-44 4/27/2022 <1 2.61 0.843 0.198 <0.005 0.028 0.059 0.46 0.00 NM
4327.03 5/12/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 NM
7/19/2022 1.7 2.93 0.874 0.052 <0.005 0.046 <0.012 0.079 0.00 9.44 4317.59
10/19/2022 1.1 0.527 0.189 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.81 4317.22
1/30/2023 <1.0 1.12 0.976 0.034 <0.005 <0.012 0.014 0.097 0.00 8.44 4318.59
4/21/2023 1.3 2.2 0.610 0.066 <0.005 <0.012 0.015 0.328 0.00 7.16 4319.87
8/25/2023 <1.0 0.177 0.177 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.83 4318.20
4327.16 12/28/2023 1.5 0.782 0.557 0.046 <0.005 0.016 <0.012 <0.012 0.00 9.44 4317.72
3/1/2024 <1.0 0.185 0.185 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.38 4318.78
MW-45 4/27/2022 <1 1.09 0.187 0.087 <0.005 0.013 0.025 0.42 0.00 NM
4329.24 5/12/2022 2.0 4.47 0.901 0.192 <0.005 0.034 0.834 1.25 0.00 NM
7/18/2022 1.5 5.6 0.963 0.308 <0.005 0.035 0.162 1.08 0.00 10.63 4318.61
10/19/2022 1.5 0.784 0.161 0.082 <0.005 <0.012 0.02 0.266 0.00 10.98 4318.26
1/30/2023 <1.0 0.848 0.021 0.06 <0.005 <0.012 <0.012 0.026 0.00 9.54 4319.70
4/21/2023 <1.0 1.04 0.012 0.04 <0.005 <0.012 <0.012 0.163 0.00 8.18 4321.06
8/25/2023 2.5 3.78 0.066 0.269 <0.005 0.046 0.03 1.53 0.00 9.95 4319.29
4329.37 12/28/2023 1.4 0.36 0.013 0.058 <0.005 <0.012 <0.012 0.134 0.00 10.52 4318.85
3/1/2024 2.7 2.55 0.012 0.218 <0.005 0.029 0.016 0.696 0.00 9.49 4319.88
Page 22 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
EW-3 03/31/20 12.2 82.8 4.14 1.87 <0.0500 0.458 4.290 23.600 0.00 10.43 4323.67
4334.10 04/08/21 8.00 20.4 0.0123 0.346 <0.0500 0.0777 0.271 2.11 0.00 11.04 4323.06
7/19/2022 1.0 2.25 <0.005 0.017 <0.005 <0.012 <0.012 0.108 0.00 11.56 4322.54
10/18/2022 1.4 1.97 <0.005 0.033 <0.005 0.012 <0.012 0.221 0.00 11.99 4322.11
1/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 0.028 0.00 10.03 4324.07
4/21/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 8.97 4325.13
8/25/2023 <1.0 1.85 <0.005 <0.012 <0.005 <0.012 <0.012 0.031 0.00 10.95 4323.15
12/2/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 11.26 4322.84
2/29/2024 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.97 4324.13
EW-4 04/08/21 7.38 38.9 <0.100 0.462 <0.100 0.181 0.129 6.860 0.00 11.74 -
7/19/2022 7.7 14.1 <0.005 <0.012 <0.005 0.012 <0.012 0.016 0.00 12.58
10/18/2022 1.3 0.919 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 12.75
1/28/2023 <1.0 0.298 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.96
4/21/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 9.41
8/25/2023 <1.0 0.322 0.006 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 11.81
12/28/2023 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 12.08
2/29/2024 <1.0 0.238 0.007 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 10.87
Page 23 of 24
Sample ID/
TOC DATE TPH-DRO TPH-GRO BENZENE
ETHYL-
BENZENE MTBE NAPH-
THALENE TOLUENE XYLENES FPT DTW
Groundwater
Elevation
MM/DD/YY (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (feet) (feet) (feet)
1 1 0.005 0.7 0.2 0.7 1 10
10 10 0.30 4 0.2 0.7 3 10
DERR ISL
DERR Tier 1
Table 1
Groundwater Analytical Results and Elevation Data
Triple Stop Chevron
1034 West Gentile Street, Layton, Utah
Release NUB; Facility ID 3000500
RW-1 09/18/19 5.81 54.3 1.21 1.22 <0.100 0.246 3.53 10.6 0.00 NM -
04/02/20 2.49 14.4 <0.100 0.36 <0.100 <0.500 0.644 3.14 0.00 NM -
RW-2 09/18/19 6.23 143 11.60 2.20 <0.500 0.303 18.5 16.7 0.00 NM -
04/02/20 3.81 79.7 4.08 1.51 <0.0500 0.148 13.2 12.9 0.00 NM -
04/08/21 13.7 86.3 2.43 1.16 <0.100 0.384 9.98 17.4 0.00 NM -
07/13/21 3.52 76.2 0.796 0.422 <0.100 0.199 4.49 4.38 0.00 NM -
10/08/2021 6.57 31.2 0.982 1.04 <0.100 0.363 7.04 7.95 0.00 NM
1/12/2022 4.6 23 0.0277 0.955 <0.100 0.214 3.49 6.37 0.00 NM
AS-2 4/27/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 NM
AS-3 4/27/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 NM
AS-6 4/27/2022 <1 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 0.00 NM
Notes:
* The sample labels for MW-3 & MW-4 were reversed on 3/15/19. Resampled on 3/19/19.
TOC = Top of Casing Elevation
TPH -GRO = Total Petroleum Hydrocarbons as Gasoline
TPH--DRO = Total Petroleum Hydrocarbons as Diesel
DTW = Depth to groundwater
FPT = Free Product Thickness
DERR = Utah Division of Environmental Response and Remediation
ISL = Initial Screening Level
Tier 1 = Tier 1 Screening Level
mg/l = milligram/liter
Page 24 of 24
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
Rockwell Solutions, Inc
Attn: Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
Work Order: 24C0063
Project: Triple Stop Chevron
3/11/2024
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 20
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
3/1/24 16:19 @ 0.7 °C
3/11/2024
Triple Stop Chevron
Sample ID: MW-1
Lab ID: 24C0063-01Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 3/1/24 14:15
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 3/4/243/4/240.005 EPA 8260D/5030B0.006Benzene
mg/L 3/4/243/4/240.012 EPA 8260D/5030B0.347Ethylbenzene
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L J-LOW-L3/4/243/4/240.012 EPA 8260D/5030B0.034Naphthalene
mg/L 3/4/243/4/240.012 EPA 8260D/5030B0.033Toluene
mg/L 3/4/243/4/240.012 EPA 8260D/5030B1.07Xylenes, total
Gasoline Range
mg/L 3/4/243/4/240.125 EPA 8260B/C /5030A/[CALC]3.34Gasoline Range Organics
Diesel Range
mg/L 3/6/243/6/241.0 EPA 8015 C1.6Diesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 24C0063
www.ChemtechFord.com
Page 2 of 19Page 2 of 20
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
3/1/24 16:19 @ 0.7 °C
3/11/2024
Triple Stop Chevron
Sample ID: MW-2
Lab ID: 24C0063-02Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 3/1/24 13:15
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 3/4/243/4/240.005 EPA 8260D/5030B0.006Benzene
mg/L 3/4/243/4/240.012 EPA 8260D/5030B0.122Ethylbenzene
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L J-LOW-L3/4/243/4/240.012 EPA 8260D/5030B0.018Naphthalene
mg/L 3/4/243/4/240.012 EPA 8260D/5030B0.012Toluene
mg/L 3/4/243/4/240.012 EPA 8260D/5030B0.449Xylenes, total
Gasoline Range
mg/L 3/4/243/4/240.125 EPA 8260B/C /5030A/[CALC]0.864Gasoline Range Organics
Diesel Range
mg/L 3/6/243/6/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 24C0063
www.ChemtechFord.com
Page 3 of 19Page 3 of 20
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
3/1/24 16:19 @ 0.7 °C
3/11/2024
Triple Stop Chevron
Sample ID: MW-4
Lab ID: 24C0063-03Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 2/29/24 11:30
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDBenzene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L J-LOW-L3/4/243/4/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDToluene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 3/4/243/4/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 3/6/243/6/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 24C0063
www.ChemtechFord.com
Page 4 of 19Page 4 of 20
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
3/1/24 16:19 @ 0.7 °C
3/11/2024
Triple Stop Chevron
Sample ID: MW-10
Lab ID: 24C0063-04Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 2/29/24 14:00
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 3/4/243/4/240.005 EPA 8260D/5030B0.006Benzene
mg/L 3/4/243/4/240.012 EPA 8260D/5030B0.040Ethylbenzene
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L J-LOW-L3/4/243/4/240.012 EPA 8260D/5030B0.028Naphthalene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDToluene
mg/L 3/4/243/4/240.012 EPA 8260D/5030B2.16Xylenes, total
Gasoline Range
mg/L 3/4/243/4/240.125 EPA 8260B/C /5030A/[CALC]5.79Gasoline Range Organics
Diesel Range
mg/L 3/6/243/6/241.0 EPA 8015 C3.1Diesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 24C0063
www.ChemtechFord.com
Page 5 of 19Page 5 of 20
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
3/1/24 16:19 @ 0.7 °C
3/11/2024
Triple Stop Chevron
Sample ID: MW-19
Lab ID: 24C0063-05Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 3/1/24 13:45
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDBenzene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L J-LOW-L3/4/243/4/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDToluene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 3/4/243/4/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 3/6/243/6/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 24C0063
www.ChemtechFord.com
Page 6 of 19Page 6 of 20
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
3/1/24 16:19 @ 0.7 °C
3/11/2024
Triple Stop Chevron
Sample ID: MW-21
Lab ID: 24C0063-06Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 2/29/24 12:00
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDBenzene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L J-LOW-L3/4/243/4/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDToluene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 3/4/243/4/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 3/6/243/6/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 24C0063
www.ChemtechFord.com
Page 7 of 19Page 7 of 20
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
3/1/24 16:19 @ 0.7 °C
3/11/2024
Triple Stop Chevron
Sample ID: MW-24
Lab ID: 24C0063-07Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 2/29/24 14:30
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDBenzene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L J-LOW-L3/4/243/4/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDToluene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 3/4/243/4/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 3/6/243/6/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 24C0063
www.ChemtechFord.com
Page 8 of 19Page 8 of 20
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
3/1/24 16:19 @ 0.7 °C
3/11/2024
Triple Stop Chevron
Sample ID: MW-27
Lab ID: 24C0063-08Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 2/29/24 15:00
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDBenzene
mg/L 3/4/243/4/240.012 EPA 8260D/5030B0.103Ethylbenzene
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L J-LOW-L3/4/243/4/240.012 EPA 8260D/5030B0.017Naphthalene
mg/L 3/4/243/4/240.012 EPA 8260D/5030B0.323Toluene
mg/L 3/4/243/4/240.012 EPA 8260D/5030B0.540Xylenes, total
Gasoline Range
mg/L 3/4/243/4/240.125 EPA 8260B/C /5030A/[CALC]1.36Gasoline Range Organics
Diesel Range
mg/L 3/6/243/6/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 24C0063
www.ChemtechFord.com
Page 9 of 19Page 9 of 20
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
3/1/24 16:19 @ 0.7 °C
3/11/2024
Triple Stop Chevron
Sample ID: MW-30
Lab ID: 24C0063-09Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 3/1/24 12:45
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDBenzene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L J-LOW-L3/4/243/4/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDToluene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 3/4/243/4/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 3/6/243/6/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 24C0063
www.ChemtechFord.com
Page 10 of 19Page 10 of 20
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
3/1/24 16:19 @ 0.7 °C
3/11/2024
Triple Stop Chevron
Sample ID: MW-32
Lab ID: 24C0063-10Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 2/29/24 11:00
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDBenzene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L J-LOW-L3/4/243/4/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDToluene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 3/4/243/4/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 3/6/243/6/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 24C0063
www.ChemtechFord.com
Page 11 of 19Page 11 of 20
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
3/1/24 16:19 @ 0.7 °C
3/11/2024
Triple Stop Chevron
Sample ID: MW-41
Lab ID: 24C0063-11Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 2/29/24 12:30
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDBenzene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L J-LOW-L3/4/243/4/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDToluene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 3/4/243/4/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 3/6/243/6/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 24C0063
www.ChemtechFord.com
Page 12 of 19Page 12 of 20
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
3/1/24 16:19 @ 0.7 °C
3/11/2024
Triple Stop Chevron
Sample ID: MW-42
Lab ID: 24C0063-12Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 3/1/24 15:10
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 3/4/243/4/240.005 EPA 8260D/5030B0.012Benzene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L J-LOW-L3/4/243/4/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDToluene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 3/4/243/4/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 3/6/243/6/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 24C0063
www.ChemtechFord.com
Page 13 of 19Page 13 of 20
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
3/1/24 16:19 @ 0.7 °C
3/11/2024
Triple Stop Chevron
Sample ID: MW-44
Lab ID: 24C0063-13Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 3/1/24 15:35
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 3/4/243/4/240.005 EPA 8260D/5030B0.185Benzene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L J-LOW-L3/4/243/4/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDToluene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 3/4/243/4/240.125 EPA 8260B/C /5030A/[CALC]0.185Gasoline Range Organics
Diesel Range
mg/L 3/6/243/6/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 24C0063
www.ChemtechFord.com
Page 14 of 19Page 14 of 20
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
3/1/24 16:19 @ 0.7 °C
3/11/2024
Triple Stop Chevron
Sample ID: MW-45
Lab ID: 24C0063-14Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 3/1/24 14:45
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 3/4/243/4/240.005 EPA 8260D/5030B0.012Benzene
mg/L 3/4/243/4/240.012 EPA 8260D/5030B0.218Ethylbenzene
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L J-LOW-L3/4/243/4/240.012 EPA 8260D/5030B0.029Naphthalene
mg/L 3/4/243/4/240.012 EPA 8260D/5030B0.016Toluene
mg/L 3/4/243/4/240.012 EPA 8260D/5030B0.696Xylenes, total
Gasoline Range
mg/L 3/4/243/4/240.125 EPA 8260B/C /5030A/[CALC]2.55Gasoline Range Organics
Diesel Range
mg/L 3/7/243/7/241.0 EPA 8015 C2.7Diesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 24C0063
www.ChemtechFord.com
Page 15 of 19Page 15 of 20
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
3/1/24 16:19 @ 0.7 °C
3/11/2024
Triple Stop Chevron
Sample ID: EW-3
Lab ID: 24C0063-15Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 2/29/24 13:00
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDBenzene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L J-LOW-L3/4/243/4/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDToluene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 3/4/243/4/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 3/7/243/7/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 24C0063
www.ChemtechFord.com
Page 16 of 19Page 16 of 20
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
3/1/24 16:19 @ 0.7 °C
3/11/2024
Triple Stop Chevron
Sample ID: EW-4
Lab ID: 24C0063-16Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 2/29/24 13:30
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 3/4/243/4/240.005 EPA 8260D/5030B0.007Benzene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 3/4/243/4/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L J-LOW-L3/4/243/4/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 3/4/243/4/240.012 EPA 8260D/5030BNDToluene
mg/L 3/4/243/4/240.012 EPA 8260D/5030B0.231Xylenes, total
Gasoline Range
mg/L 3/4/243/4/240.125 EPA 8260B/C /5030A/[CALC]0.238Gasoline Range Organics
Diesel Range
mg/L 3/7/243/7/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 24C0063
www.ChemtechFord.com
Page 17 of 19Page 17 of 20
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
3/1/24 16:19 @ 0.7 °C
3/11/2024
Triple Stop Chevron
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-L = Estimated low due to low recovery of LCS
Project Name: Triple Stop Chevron CtF WO#: 24C0063
www.ChemtechFord.com
Page 18 of 19Page 18 of 20
Page 19 of 20
Page 20 of 20