DERR-2025-004164

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]
June 2, 2025

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

RE: Groundwater Monitoring Report, May 2-3, 2025
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
May 2-3, 2025. Groundwater samples were collected from twenty-three monitoring wells using
disposable bailers, 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 samples were also
analyzed for TPH-GRO fractionation. 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. The benzene concentration in EW-3 exceeded the Tier 1 level.
Concentrations exceeded the Initial Screening Levels in samples from MW-1, MW-2, MW-10, MW-27,
and MW-45. 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
0.65 feet since the sampling event on January 14, 2025. The apparent direction of groundwater flow
across the site on May 2-3, 2025, was to the southwest.

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-11
Dissolved Benzene
5/2-3/2025
MW-9
MW-11
MW-31
<0.002
MW-38 MW-37MW-39
MW-26
MW-29
<0.002
MW-28
MW-32
Monitoring Well
0.018 Benzene (mg/L)
<0.002
MW-17
MW-43
<0.002
MW-34
NORTH
Approx. scale in feet
00 90
Unsampled wells are assumed to have non-detectable concentrations
MW-20
MW-18
<0.002
MW-16
MW-40
<0.002
MW-21
<0.002
MW-23
<0.002
MW-3
<0.002
MW-30
MW-4
<0.002
MW-22
MW-44
MW-41
MW-1
0.003
0.002
0.010
MW-42
<0.002
MW-19
MW-35
<0.002
0.3 < 1.0
0.005 < 0.3
MW-24 MW-25
<0.002
MW-2
0.008
MW-27
0.012
MW-45
<0.02
MW-14
MW-5
0.546
MW-12
EW-4
EW-3
MW-13
<0.002
0.052
<0.02
MW-10
Figure 2
C StoreTank
Basin
Canopy
Motel
Motel
Remediation
Compound
Mo
t
e
l
USTs
C-Store
Canopy
Triple Stop Chevron
1034 W Gentile Street
Layton, Utah
MW-4
MW-3
MW-31
<0.05
MW-34
MW-38 MW-32
<0.05
MW-37MW-39
Dissolved TPH-GRO
5/2-3/2025
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
<0.05
MW-5
MW-11
MW-22 MW-24
<0.05
MW-9
MW-11
MW-25
MW-26
MW-12
EW-4
<0.05
EW-3
<0.05
0.546
MW-29
<0.05
MW-43
<0.05
MW-41
<0.05
MW-28
000518
MW-35
<0.05
<0.05
MW-40
<0.05MW-18
<0.05
MW-16
MW-21
MW-2
MW-20
MW-42 MW-44
MW-17 <0.05
Approx. scale in feet
00 90
MW-19
<0.05
1.5
MW-27 MW-23
0.0544
1.66
MW-1
4.5
MW-45
Monitoring Well
0.714
<0.05
MW-10
Figure 3Approx. scale in feet
00 90
Triple Stop Chevron
1034 W Gentile Street
Layton, Utah
MW-8
MW-5
Groundwater Contours
5/2-3/2025
MW-9
MW-11
EW-3
MW-34
MW-35
4319.65 MW-27
MW-1
MW-4
4320.14
MW-3
MW-24
MW-38 MW-37
MW-20
4319.91
MW-44
4318.55
MW-21
MW-25
MW-26
MW-12
MW-29
4317.33
MW-28
MW-16
MW-17
MW-13
4323.15
MW-41
4318.81
-
4
3
2
2
-
-
4
3
2
0
-
Monitoring Well
(4317.59)= Groundwater Elevation (ft)
= Groundwater Elevation Contour (ft)
NORTH
4318.44
4320.08
4323.42
MW-39
MW-30
MW-14
MW-32
4316.70
MW-42
-4
3
1
7
-
-4
3
1
6
-
EW-4
MW-23
4320.90
MW-45
4319.68
4318.82
MW-19
MW-22
4317.94
MW-43
4316.49
MW-18
4318.26
4319.59
MW-2
-
4
3
1
9
-
-
4
3
1
8
-
-
4
3
1
7
-
-
4
3
2
1
-
4323.10
MW-10
MW-31
4317.11
MW-40
4319.25
4322.01
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
7/6/2024 2.6 5.34 <0.005 0.317 <0.008 0.054 0.034 2.31 0.00 10.56 4319.75
1/14/2025 <1 0.444 <0.005 0.159 <0.008 <0.012 <0.012 <0.038 0.00 10.98 4319.33
5/3/2025 <1 1.66 0.003 0.377 <0.003 0.036 0.027 0.702 0.00 10.40 4319.91
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 28
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
7/6/2024 <1 <0.125 <0.005 <0.012 <0.008 <0.012 <0.012 <0.038 0.00 10.72 4319.42
1/14/2025 <1 <0.125 <0.005 <0.012 <0.008 <0.012 <0.012 <0.038 0.00 11.12 4319.02
5/3/2025 <1 0.714 0.008 0.07 <0.003 0.02 <0.005 0.08 0.00 10.55 4319.59
Page 2 of 28
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
Page 3 of 28
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-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
7/6/2024 <1.0 <0.125 <0.005 <0.012 <0.008 <0.012 <0.012 <0.038 0.00 10.18 4319.87
5/3/2025 <1.0 <0.05 <0.002 <0.005 <0.003 <0.005 <0.005 <0.015 0.00 9.91 4320.14
Page 4 of 28
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-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
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 5 of 28
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
7/6/2024 3.5 6.66 <0.005 <0.012 <0.008 0.025 <0.012 0.718 0.00 11.21 4323.25
1/14/2025 <1.0 <0.125 <0.005 <0.012 <0.008 <0.012 <0.012 <0.038 0.00 12.00 4322.46
5/3/2025 <1.0 0.0518 0.052 <0.005 <0.003 <0.005 <0.005 <0.015 0.00 11.36 4323.10
Page 6 of 28
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-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 7 of 28
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
5/3/2025 <1.0 <0.05 <0.002 <0.005 <0.003 <0.005 <0.005 <0.015 0.00 9.67 4323.15
Page 8 of 28
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
Page 9 of 28
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-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
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
5/2/2025 <1.0 <0.05 <0.002 <0.005 <0.003 <0.005 <0.005 <0.015 0.00 9.48 4318.26
Page 10 of 28
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
7/6/2024 1.10 <0.125 0.01 <0.012 <0.008 <0.012 <0.012 <0.038 0.00 8.61 4318.63
1/14/2025 <1 <0.125 <0.005 <0.012 <0.008 <0.012 <0.012 <0.038 0.00 8.98 4318.26
5/3/2025 <1 <0.05 <0.002 <0.005 <0.003 <0.005 <0.005 <0.015 0.00 8.42 4318.82
Page 11 of 28
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
7/6/2024 <1.0 <0.125 <0.005 <0.012 <0.008 <0.012 <0.012 <0.038 0.00 9.94 4318.50
1/14/2025 <1.0 <0.125 <0.005 <0.012 <0.008 <0.012 <0.012 <0.038 0.00 10.10 4318.34
5/2/2025 <1.0 <0.05 <0.002 <0.005 <0.003 <0.005 <0.005 <0.015 0.00 10.00 4318.44
Page 12 of 28
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 13 of 28
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
5/3/2025 <1.0 0.0544 <0.002 <0.005 <0.003 <0.005 <0.005 <0.015 0.00 12.77 4320.90
Page 14 of 28
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
7/6/2024 <1.0 0.438 0.438 <0.012 <0.008 <0.012 <0.012 <0.038 0.00 11.30 4322.02
1/14/2025 <1.0 <0.125 <0.005 <0.012 <0.008 <0.012 <0.012 <0.038 0.00 11.95 4321.37
5/3/2025 <1.0 <0.05 <0.002 <0.005 <0.003 <0.005 <0.005 <0.015 0.00 11.31 4322.01
Page 15 of 28
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-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
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
7/6/2024 1.6 3.99 0.007 0.072 <0.008 0.035 0.076 1.870 0.00 13.83 4319.49
1/14/2025 <1 <0.010 <0.0004 <0.001 <0.0006 <0.001 <0.001 <0.003 0.00 14.14 4319.18
5/3/2025 3.34 1.5 0.012 0.306 <0.003 0.049 0.362 2.33 0.00 13.24 4320.08
MW-28 03/20/19 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.012 NM NM --
Page 16 of 28
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-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
5/2/2025 <1.0 <0.05 <0.002 <0.005 <0.003 <0.005 <0.005 <0.015 0.00 9.02 4317.33
Page 17 of 28
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
7/6/2024 <1.0 <0.125 <0.005 <0.012 <0.008 <0.012 <0.012 <0.038 0.00 8.61 4318.25
1/14/2025 <1 <0.010 <0.0004 <0.001 <0.0006 <0.001 <0.001 <0.003 0.00 9.35 4317.51
Page 18 of 28
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
5/2/2025 <1.0 <0.05 <0.002 <0.005 <0.003 <0.005 <0.005 <0.015 0.00 8.75 4317.11
Page 19 of 28
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
7/6/2024 <1.0 <0.125 <0.005 <0.012 <0.005 <0.012 <0.012 <0.038 0.00 9.37 4316.52
1/14/2025 <1 <0.010 <0.0004 <0.001 <0.0006 <0.001 <0.001 <0.003 0.00 9.71 4316.18
5/2/2025 <1.0 <0.05 <0.002 <0.005 <0.003 <0.005 <0.005 <0.015 0.00 9.19 4316.70
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 20 of 28
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
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
5/3/2025 <1.0 <0.05 <0.002 <0.005 <0.003 <0.005 <0.005 <0.015 0.00 12.54 4319.65
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 21 of 28
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 22 of 28
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
5/2/2025 <1.0 <0.05 <0.002 <0.005 <0.003 <0.005 <0.005 <0.015 0.00 8.22 4319.25
Page 23 of 28
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-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
7/6/2024 <1.0 <0.125 <0.005 <0.012 <0.008 <0.012 <0.012 <0.038 0.00 10.11 4318.72
1/14/2025 <1.0 <0.010 <0.0004 <0.001 <0.0006 <0.001 <0.001 <0.003 0.00 10.57 4318.26
5/3/2025 <1.0 <0.05 <0.002 <0.005 <0.003 <0.005 <0.005 <0.015 0.00 10.02 4318.81
Page 24 of 28
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 7.94 4319.03
7/6/2024 <1 0.17 0.018 0.013 <0.008 <0.012 <0.012 <0.012 0.00 8.77 4318.20
1/14/2025 <1.0 <0.010 <0.0004 <0.001 <0.0006 <0.001 <0.001 <0.003 0.00 9.40 4317.57
5/2/2025 <1.0 <0.05 <0.002 <0.005 <0.003 <0.005 <0.005 <0.015 0.00 9.03 4317.94
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
5/3/2025 <1.0 <0.05 <0.002 <0.005 <0.003 <0.005 <0.005 <0.015 0.00 10.44 4316.49
Page 25 of 28
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
7/6/2024 <1.0 <0.125 <0.005 <0.012 <0.008 <0.012 <0.012 <0.038 0.00 8.60 4318.56
1/14/2025 <1.0 <0.010 <0.0004 <0.001 <0.0006 <0.001 <0.001 <0.003 0.00 10.57 4316.59
5/2/2025 <1.0 <0.05 0.002 <0.005 <0.003 <0.005 <0.005 <0.015 0.00 8.61 4318.55
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
7/6/2024 <1.0 0.596 <0.005 0.08 <0.008 <0.012 <0.012 0.16 0.00 9.90 4319.47
1/14/2025 <1.0 0.0138 <0.0004 0.008 <0.0006 <0.001 <0.001 0.006 0.00 10.34 4319.03
5/2/2025 2.30 4.5 <0.02 1.04 <0.03 0.061 0.054 3.35 0.00 9.69 4319.68
Page 26 of 28
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
7/6/2024 <1.0 <0.125 <0.005 <0.012 <0.008 <0.012 <0.012 <0.038 0.00 10.40 4323.70
1/14/2025 <1.0 <0.010 <0.0004 <0.001 <0.0006 <0.001 <0.001 <0.003 0.00 11.23 4322.87
5/2/2025 <1.0 0.546 0.546 <0.05 <0.03 <0.05 <0.05 <0.15 0.00 10.68 4323.42
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
7/6/2024 <1.0 <0.125 <0.005 <0.012 <0.008 <0.012 <0.012 <0.038 0.00 11.25
1/14/2025 <1.0 <0.010 <0.0004 <0.001 <0.0006 <0.001 <0.001 <0.003 0.00 12.02
5/2/2025 <1.0 <0.50 <0.02 <0.05 <0.03 <0.05 <0.05 <0.15 0.00 11.46
Page 27 of 28
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 = milligrams/liter
Page 28 of 28
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: 25E0206
Project: Triple Stop Chevron
5/12/2025
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 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 1
Lab ID: 25E0206-01Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/3/25 14:10
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030B0.003Benzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030B0.377Ethylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030B0.036Naphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030B0.027Toluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030B0.702Xylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030B0.209C5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030B0.129C7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030B0.176C9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]1.66Gasoline Range Organics
Diesel Range
mg/L 5/6/255/6/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 2 of 26Page 2 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 2
Lab ID: 25E0206-02Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/3/25 12:40
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030B0.008Benzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030B0.070Ethylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030B0.022Naphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030B0.080Xylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030B0.260C5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030B0.125C7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030B0.148C9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]0.714Gasoline Range Organics
Diesel Range
mg/L 5/6/255/6/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 3 of 26Page 3 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 4
Lab ID: 25E0206-03Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/3/25 13:10
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030BNDBenzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/6/255/6/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 4 of 26Page 4 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 10
Lab ID: 25E0206-04Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/3/25 18:10
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030B0.052Benzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]0.0518Gasoline Range Organics
Diesel Range
mg/L 5/6/255/6/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 5 of 26Page 5 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 13
Lab ID: 25E0206-05Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/3/25 17:40
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030BNDBenzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/6/255/6/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 6 of 26Page 6 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 18
Lab ID: 25E0206-06Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/2/25 19:00
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030BNDBenzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/6/255/6/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 7 of 26Page 7 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 19
Lab ID: 25E0206-07Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/3/25 14:40
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030BNDBenzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/6/255/6/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 8 of 26Page 8 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 21
Lab ID: 25E0206-08Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/2/25 19:30
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030BNDBenzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/6/255/6/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 9 of 26Page 9 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 23
Lab ID: 25E0206-09Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/3/25 16:10
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030BNDBenzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030B0.054C7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]0.0544Gasoline Range Organics
Diesel Range
mg/L 5/7/255/7/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 10 of 26Page 10 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 24
Lab ID: 25E0206-10Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/3/25 15:40
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030BNDBenzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/7/255/7/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 11 of 26Page 11 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 27
Lab ID: 25E0206-11Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/3/25 16:40
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030B0.012Benzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030B0.306Ethylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030B0.049Naphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030B0.362Toluene
mg/L 5/6/255/6/250.150 EPA 8260D/5030B2.33Xylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030B0.061C5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030B0.052C7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030B0.162C9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.150 EPA 8260B/C /5030A/[CALC]3.34Gasoline Range Organics
Diesel Range
mg/L 5/7/255/7/251.0 EPA 8015 C1.5Diesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 12 of 26Page 12 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 29
Lab ID: 25E0206-12Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/2/25 17:30
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030BNDBenzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/7/255/7/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 13 of 26Page 13 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 31
Lab ID: 25E0206-13Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/2/25 17:00
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030BNDBenzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/7/255/7/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 14 of 26Page 14 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 32
Lab ID: 25E0206-14Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/2/25 16:30
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030BNDBenzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/7/255/7/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 15 of 26Page 15 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 35
Lab ID: 25E0206-15Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/3/25 17:10
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030BNDBenzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/7/255/7/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 16 of 26Page 16 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 40
Lab ID: 25E0206-16Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/2/25 12:10
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030BNDBenzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/7/255/7/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 17 of 26Page 17 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 41
Lab ID: 25E0206-17Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/3/25 18:30
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030BNDBenzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/7/255/7/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 18 of 26Page 18 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 42
Lab ID: 25E0206-18Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/2/25 15:10
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030BNDBenzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/7/255/7/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 19 of 26Page 19 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 43
Lab ID: 25E0206-19Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/3/25 18:00
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030BNDBenzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/7/255/7/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 20 of 26Page 20 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 44
Lab ID: 25E0206-20Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/2/25 11:40
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.002 EPA 8260D/5030B0.002Benzene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.003 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.005 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.015 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.0500 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/7/255/7/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 21 of 26Page 21 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: MW - 45
Lab ID: 25E0206-21Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/2/25 13:40
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.020 EPA 8260D/5030BNDBenzene
mg/L 5/6/255/6/250.050 EPA 8260D/5030B1.04Ethylbenzene
mg/L 5/6/255/6/250.030 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.050 EPA 8260D/5030B0.061Naphthalene
mg/L 5/6/255/6/250.050 EPA 8260D/5030B0.054Toluene
mg/L 5/6/255/6/250.150 EPA 8260D/5030B3.35Xylenes, total
mg/L 5/6/255/6/250.500 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.500 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.500 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.500 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.500 EPA 8260B/C /5030A/[CALC]4.50Gasoline Range Organics
Diesel Range
mg/L 5/7/255/7/251.0 EPA 8015 C2.3Diesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 22 of 26Page 22 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: EW - 3
Lab ID: 25E0206-22Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/2/25 18:40
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.020 EPA 8260D/5030B0.546Benzene
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.030 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.150 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.500 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.500 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.500 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.500 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.500 EPA 8260B/C /5030A/[CALC]0.546Gasoline Range Organics
Diesel Range
mg/L 5/8/255/8/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 23 of 26Page 23 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
Triple Stop Chevron
Sample ID: EW - 4
Lab ID: 25E0206-23Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/2/25 19:10
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/6/255/6/250.020 EPA 8260D/5030BNDBenzene
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDEthylbenzene
mg/L 5/6/255/6/250.030 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDNaphthalene
mg/L 5/6/255/6/250.050 EPA 8260D/5030BNDToluene
mg/L 5/6/255/6/250.150 EPA 8260D/5030BNDXylenes, total
mg/L 5/6/255/6/250.500 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.500 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.500 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 5/6/255/6/250.500 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
Gasoline Range
mg/L 5/6/255/6/250.500 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/8/255/8/251.0 EPA 8015 CNDDiesel Range Organics
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 24 of 26Page 24 of 27
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:
5/5/25 10:29 @ 3.4 °C
5/12/2025
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.
Project Name: Triple Stop Chevron CtF WO#: 25E0206
www.ChemtechFord.com
Page 25 of 26Page 25 of 27
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