DERR-2024-004766

2410 WEST CALIFORNIA AVENUE • SALT LAKE CITY, UTAH 84104
PHONE [phone] • FAX [phone]
Website: www.wasatch-environmental.com • e-Mail: [e-mail]

Mr. Craig Larson October 9, 2023
Wind River Petroleum Project No.: 1241-026A
5097 South 900 East
Salt Lake City, Utah 84117

SUBJECT: Semi-Annual Groundwater Sampling Results and
Corrective Action Status Update – August 2023
C-4 Top Stop
15 South Main Street
Gunnison, Utah
UST Facility No. 2000220
Release Site EMHB

This report has been prepared pursuant to the reporting requirements set forth in the May 9, 2008, Corrective
Action Plan (CAP) Summary Letter prepared by Wasatch Environmental, Inc., (Wasatch) on behalf of Wind
River Petroleum. This report provides a summary of the following:

• Corrective action status update,
• Groundwater depth and fluctuations,
• Results of the August 2023 semi-annual groundwater sampling, and
• Recommendations.

Questions regarding this report from third parties should be submitted to Avery Holyoak with the Utah Division
of Environmental Response and Remediation (DERR), and written responses will be provided.

CORRECTIVE ACTION STATUS UPDATE

Wasatch discontinued monitoring the building ventilation sub-slab systems following the August 2015
groundwater monitoring event. However, given the discovery of a small amount of free product in
monitoring well MW-41 (discovered on February 3, 2016, and discussed later in this report), the building
sub-slab ventilation systems for the residences located at 29 West 100 South and 39 West 100 South
were checked on August 9, 2023, as a precaution. Both systems were checked with a photoionization
detector (PID). The building sub-slab ventilation system effluent was checked using a calibrated, parts
per billion-range PID. Volatile organic compounds (VOCs) were not detected in the effluent of the sub-
slab ventilation systems located at 29 West 100 South or 39 West 100 South. During our visit to the site
in September 2022, the resident at 39 West 100 South reported what he believed to be petroleum odors
from the ventilation system effluent coming into the home through open windows . During our following
visit to the site in February 2023, we sealed holes and seams in the vent stack with caulk. During our
current visit to the site, we spoke with the resident who reported no petroleum odors since the holes and
seams were sealed in February.

Groundwater extraction using a vacuum truck to remove free product from monitoring well MW -41 has not
been conducted since November 1, 2019. No measurable free product was present in monitoring well
MW-41 prior to sampling on August 9, 2023.

Wasatch Environmental Inc.
Page 2
GROUNDWATER DEPTH AND FLUCTUATIONS

Based on the measurement collected on August 9, 2023, the groundwater elevation increased 1.86 feet
since February 2023 (see Appendix A).

SEMI-ANNUAL GROUNDWATER SAMPLING

Semi-annual groundwater monitoring was successfully completed at monitoring wells MW-27 and MW-41
on August 9, 2023.

The absorbent sock in monitoring well MW-41 was approximately 50% saturated upon our arrival and was
replaced after the groundwater sample was collected.

Groundwater monitoring was conducted using low-flow sampling techniques using a peristaltic pump and
a multi-parameter Troll 9500 meter to allow for the collection of additional geochemical data including
temperature, specific conductivity, pH, oxidation-reduction potential (ORP), dissolved oxygen (DO), and
turbidity.

The groundwater samples were collected using a low-flow sampling procedure following the United
States Environmental Protection Agency (U.S. EPA) guidelines. The sampling procedure involved
inserting ¼-inch, low-density polyethylene tubing into the monitoring well. The tubing was run through a
peristaltic pump, then to a flow-through cell to which a multi-parameter Troll 9500 meter was attached,
and finally to a 5-gallon bucket to collect the purge water. The initial water levels were measured and
recorded prior to the initiation of pumping. Once pumping was initiated, water level, pumping rate,
cumulative volume purged, water temperature, specific conductivity, pH, ORP, DO, and turbidity were
recorded at 5-minute intervals until either stabilization was achieved or the well pumped dry. Pumping
rate was maintained at a rate of 90 milliliters per minute to minimize drawdown. Stabilization was defined
as three consecutive measurement intervals where temperature and specific conductivity were +/- 3%, pH
was +/- 0.1, DO was +/-10% (or less than 0.5 milligrams per liter [mg/L]), and turbidity was +/- 10% (or
less than 5 nephelometric turbidity units [NTUs]). After stabilization was achieved, the tubing was
disconnected from the flow-through cell and the groundwater samples were dispensed into 40-milliliter
capacity, glass vials with Teflon® septa caps. The vials, which were supplied by the analytical laboratory,
contained several drops of hydrochloric acid as a preservative. The vials were filled slowly until a
meniscus formed at the top of each vial, then each vial was sealed with a septa cap. This procedure
eliminates headspace within the vials and minimizes the loss of volatiles. The sample vials were each
labeled with the analysis required, samplers name, sample identification, sample location, date, and time
of sample collection. The samples were placed in a cooler with ice and transported under chain-of-
custody protocol to Chemtech-Ford Laboratories for analysis. The groundwater samples were analyzed
for total petroleum hydrocarbons as gasoline-range organics (TPH-GRO), benzene, toluene,
ethylbenzene, xylenes, and naphthalene (BTEXN) using U.S. EPA Method 8260D.

A summary of current and historical groundwater analytical results is presented in Table 2 (Appendix B).
The low-flow sampling forms are presented in Appendix C. The current laboratory analytical results are
presented in Appendix D.

Analytical results from the August 2023 groundwater monitoring event for monitoring well MW-27 indicate:

• the benzene concentration (0.037 mg/L) exceeded the Utah Initial Screening Level (ISL) of
0.005 mg/L,
• the TPH-GRO concentration (20.1 mg/L) exceeded the Utah ISL of 1 mg/L,
• the toluene concentration (0.336 mg/L) was below the Utah ISL of 1 mg/L,
• the ethylbenzene concentration (1.61 mg/L) exceeded the Utah ISL of 0.7 mg/L,
• the xylene concentration (4.67 mg/L) was below the Utah ISL of 10 mg/L, and
• the naphthalene concentration (0.525 mg/L) was below the Utah ISL of 0.7 mg/L.

Wasatch Environmental Inc.
Page 3
Analytical results from the August 2023 groundwater monitoring event for monitoring well MW-41 indicate:

• the benzene concentration (0.065 mg/L) exceeded the Utah ISL of 0.005 mg/L,
• the TPH-GRO concentration (11.40 mg/L) exceeded the Utah ISL of 1 mg/L,
• the toluene concentration (0.200 mg/L) was below the Utah ISL of 1 mg/L,
• the ethylbenzene concentration (0.958 mg/L) exceeded the Utah ISL of 0.7 mg/L,
• the xylene concentration (2.02 mg/L) was below the Utah ISL of 10 mg/L, and
• the naphthalene concentration (0.205 mg/L) was below the Utah ISL of 0.7 mg/L.

The locations of the monitoring wells and the August 2023 benzene concentration in groundwater are
presented on Figure 1. Laboratory analytical results are summarized in Table 2 (Appendix B).

The next groundwater monitoring event is scheduled for February 2024. Groundwater monitoring wells
MW-27 and MW-41 will be sampled during this event.

RECOMMENDATIONS

Wasatch recommends that the absorbent sock in monitoring well MW-41 continue to be checked every
six months and replaced as necessary, and the sub-slab ventilation systems at the residences located at
29 West 100 South and 39 West 100 South also be checked every six months.

Our services consist of professional opinions and recommendations made in accordance with generally
accepted environmental engineering principles and practices. This warranty is in lieu of all other
warranties either expressed or implied. Should you have any questions, please do not hesitate to contact
us.

Sincerely,

WASATCH ENVIRONMENTAL, INC.

Michael S. Cronin, P.G. Anna Fiorini
Senior Geologist and Senior Project Manager Environmental Scientist
Utah UST Certified Consultant #CC-0232

Copies: Addressee (2)
Ms. Avery Holyoak, Utah DERR (1)
Gunnison City (1)

FIGURE
Figure 1 – August 2023 Benzene Concentrations in Groundwater

APPENDICES
Appendix A – Table 1 – Historical Depth to Groundwater
Appendix B – Table 2 – Historical Groundwater Chemistry
Appendix C – Low-Flow Groundwater Sampling Forms
Appendix D – Laboratory Analytical Report
August 9, 2023
August 2023 Benzene
Concentrations in Groundwater
0.065 mg/L
MW-5
MW-26
0.037 mg/L

Appendix A

Table 1 – Historical Depth to Groundwater

Sample
Identity Date Depth to
Groundwater (ft)
TW-1 01/11/08 12.50
02/26/08 12.36
06/26/08 12.29
TW-2 01/11/08 13.22
02/26/08 13.06
06/26/08 12.76
TW-3 01/11/08 12.23
02/26/08 12.32
06/26/08 12.03
08/22/08 10.71
09/16/08 10.41
10/22/08 10.44
12/01/08 11.21
12/09/08 11.34
12/19/08 11.51
12/30/08 11.67
01/06/09 11.78
01/20/09 11.43
01/27/09 11.32
02/03/09 11.22
02/10/09 11.19
02/17/09 11.13
02/24/09 11.17
03/10/09 11.75
03/17/09 11.88
03/27/09 12.14
04/02/09 12.25
04/08/09 12.34
04/15/09 11.89
04/28/09 12.10
05/05/09 11.87
05/11/09 11.84
05/20/09 11.62
05/27/09 11.74
06/10/09 11.29
06/18/09 11.03
06/23/09 10.87
07/08/09 11.22
07/21/09 11.22
08/04/09 10.59
08/12/09 10.55
09/16/09 10.62
09/30/09 10.38
10/15/09 10.20
11/03/09 10.27
05/18/10 11.78
06/30/10 9.65
07/13/10 10.36
08/02/10 10.29
09/21/10 10.18
11/22/10 9.77
02/24/11 11.07
05/26/11 10.19
08/25/11 8.58
02/27/12 10.71
08/09/12 9.27
02/20/13 11.97
TW-4 01/11/08 17.93
06/26/08 15.95
04/03/10 15.97
04/14/10 15.90
05/05/10 15.51
05/18/10 15.34
07/13/10 14.51
08/02/10 14.45
01/06/11 14.90
Table 1
Historical Depth to Groundwater
Gunnison Remediation
Gunnison, Utah
15 South Main Street
Page 1 of 13
Table 1
Historical Depth to Groundwater
Gunnison Remediation
Gunnison, Utah
15 South Main Street
TW-6 12/19/07 13.86
06/26/08 13.46
04/03/10 14.10
04/14/10 14.01
05/05/10 13.67
05/18/10 13.55
07/13/10 12.93
08/02/10 12.73
01/06/11 12.75
WS-1 01/11/08 13.19
02/26/08 13.59
06/25/08 11.62
WS-2 01/11/08 12.61
02/26/08 11.31
06/25/08 11.23
11/18/08 9.93
01/14/09 11.95
01/20/09 11.94
01/27/09 11.92
02/10/09 12.20
02/24/09 12.19
03/03/09 12.52
03/10/09 12.48
03/17/09 12.75
04/08/09 13.11
04/15/09 13.07
05/11/09 12.41
05/20/09 12.02
06/10/09 11.18
06/18/09 10.68
06/23/09 10.56
07/08/09 10.16
07/21/09 9.86
08/04/09 9.34
08/12/09 9.19
09/16/09 8.77
09/30/09 8.77
10/15/09 8.63
11/11/09 9.19
12/23/09 10.85
01/27/10 11.22
02/22/10 11.81
04/03/10 12.16
04/14/10 13.54
05/05/10 11.80
05/18/10 11.61
07/13/10 9.41
08/02/10 8.99
09/21/10 8.16
11/22/10 7.67
02/24/11 10.92
05/26/11 9.24
06/24/11 8.67
08/25/11 7.35
02/28/12 10.64
08/09/12 8.61
02/20/13 12.67
08/14/13 8.46
02/12/14 11.50
08/04/14 7.78
WS-3 01/11/08 10.50
02/26/08 10.17
06/25/08 10.21
Page 2 of 13
Table 1
Historical Depth to Groundwater
Gunnison Remediation
Gunnison, Utah
15 South Main Street
MW-1 11/27/07 11.55
12/19/07 11.89
01/11/08 11.98
02/26/08 11.85
06/26/08 11.64
08/22/08 10.84
09/16/08 10.92
10/22/08 11.06
11/24/08 11.32
12/01/08 11.43
12/09/08 11.51
12/19/08 11.61
12/30/08 11.72
01/06/09 11.78
01/20/09 11.76
01/27/09 11.43
02/03/09 11.54
02/10/09 11.54
02/17/09 11.52
02/24/09 11.52
03/10/09 11.74
03/17/09 11.68
03/27/09 12.01
04/02/09 12.07
04/08/09 12.13
04/15/09 12.00
04/28/09 11.97
05/11/09 11.72
05/20/09 11.61
05/27/09 11.50
06/10/09 10.78
06/18/09 10.78
06/23/09 10.71
07/08/09 11.00
07/21/09 11.07
08/04/09 10.99
08/12/09 10.94
09/16/09 10.85
09/30/09 10.82
10/15/09 10.82
11/03/09 10.71
11/11/09 10.80
12/23/09 11.23
01/27/10 11.67
02/02/10 11.78
03/24/10 11.83
04/03/10 11.67
05/18/10 11.65
06/30/10 9.66
07/13/10 10.42
08/02/10 10.78
09/21/10 11.01
11/22/10 10.65
02/24/11 11.15
05/26/11 10.29
08/25/11 8.77
02/27/12 9.54
08/09/12 10.28
02/20/13 11.60
MW-2 11/27/07 11.84
12/19/07 12.15
01/11/08 12.28
02/26/08 12.09
06/26/08 11.99
11/18/08 11.70
02/17/09 11.96
05/11/09 12.15
08/04/09 11.62
11/11/09 11.38
02/17/10 11.64
02/22/10 12.16
03/24/10 12.18
04/03/10 12.11
04/14/10 12.20
05/05/10 12.13
05/18/10 12.02
07/13/10 11.08
08/02/10 11.41
Page 3 of 13
Table 1
Historical Depth to Groundwater
Gunnison Remediation
Gunnison, Utah
15 South Main Street
MW-3 11/27/07 11.28
12/19/07 11.64
01/11/08 11.83
02/26/08 11.48
06/26/08 11.40
11/18/08 11.04
02/17/09 11.26
05/11/09 11.50
08/04/09 10.80
11/11/09 10.62
02/17/10 12.16
02/22/10 11.56
03/24/10 11.95
04/03/10 11.42
04/14/10 11.67
05/05/10 11.56
05/18/10 11.33
07/13/10 10.21
08/02/10 10.62
MW-4 11/27/07 12.36
12/19/07 12.36
01/11/08 12.62
02/26/08 12.15
06/26/08 11.70
MW-5 01/11/08 15.11
02/26/08 15.59
06/26/08 14.77
08/22/08 12.85
09/16/08 12.93
10/22/08 12.82
10/29/08 12.85
11/18/08 13.24
12/01/08 13.51
12/09/08 13.75
12/19/08 14.10
12/30/08 14.26
01/06/09 14.44
01/20/09 14.42
01/27/09 14.38
02/03/09 14.39
02/10/09 14.43
02/17/09 14.51
02/24/09 14.73
03/03/09 14.91
03/10/09 15.13
03/17/09 15.28
03/27/09 15.49
04/02/09 15.58
04/08/09 15.67
04/15/09 15.73
04/28/09 15.67
05/11/09 15.35
05/20/09 15.61
05/27/09 14.71
06/10/09 14.64
06/18/09 14.33
06/23/09 14.26
07/08/09 13.67
07/21/09 13.33
08/04/09 13.05
08/12/09 12.78
09/16/09 12.48
09/30/09 12.37
10/15/09 11.85
11/03/09 12.11
11/11/09 12.31
12/23/09 13.44
02/17/10 14.15
02/22/10 14.62
03/24/10 14.73
04/03/10 14.82
04/14/10 14.78
05/05/10 14.31
Page 4 of 13
Table 1
Historical Depth to Groundwater
Gunnison Remediation
Gunnison, Utah
15 South Main Street
MW-5 05/18/10 13.94
(cont'd)07/13/10 12.19
08/02/10 11.89
09/21/10 11.46
11/22/10 11.46
02/24/11 13.41
05/26/11 12.47
08/25/11 10.49
02/27/12 12.67
08/09/12 11.18
02/20/13 14.75
02/16/22 16.00
MW-6 01/11/08 12.20
02/26/08 11.74
06/26/08 11.62
04/02/09 12.24
MW-7 01/11/08 12.55
02/26/08 12.07
06/26/08 11.91
04/02/09 12.57
MW-8 01/11/08 12.95
02/26/08 12.44
06/26/08 12.04
MW-9 01/11/08 15.05
02/26/08 14.54
06/26/08 14.37
11/18/08 13.61
01/09/09 14.67
01/27/09 14.11
02/03/09 14.28
02/17/09 14.20
02/24/09 14.23
03/03/09 14.20
03/10/09 14.13
03/17/09 14.07
03/27/09 14.88
04/02/09 15.02
04/08/09 15.10
04/15/09 14.98
04/28/09 14.87
05/11/09 14.84
05/20/09 14.36
05/27/09 13.74
06/10/09 13.24
06/18/09 12.57
06/23/09 12.66
07/08/09 13.09
07/21/09 13.29
08/04/09 13.34
08/12/09 13.29
09/16/09 13.13
09/30/09 12.90
10/15/09 13.39
11/11/09 12.92
12/23/09 13.91
02/22/10 14.51
03/24/10 14.65
05/18/10 14.03
06/30/10 11.02
07/13/10 12.27
08/02/10 12.93
09/21/10 13.67
11/22/10 13.13
02/24/11 13.68
05/26/11 11.88
06/24/11 5.40
08/25/11 9.22
02/27/12 9.70
08/09/12 12.90
02/20/13 13.68
Page 5 of 13
Table 1
Historical Depth to Groundwater
Gunnison Remediation
Gunnison, Utah
15 South Main Street
MW-11 01/11/08 10.08
02/26/08 10.52
06/26/08 10.35
10/22/08 9.42
MW-12 01/11/08 10.60
02/26/08 8.92
06/26/08 8.72
02/17/09 7.98
02/24/09 8.00
03/10/09 8.45
03/17/09 8.58
03/27/09 8.75
04/02/09 8.86
04/08/09 8.92
04/15/09 8.40
05/05/09 8.26
05/11/09 8.46
05/20/09 8.21
05/27/09 8.41
06/10/09 7.75
06/18/09 7.68
06/23/09 7.56
07/08/09 7.96
07/21/09 7.90
08/04/09 7.33
08/12/09 7.26
09/16/09 7.58
09/30/09 7.30
10/15/09 7.13
11/03/09 7.24
05/18/10 8.43
06/30/10 6.59
07/13/10 7.35
08/02/10 7.38
09/21/10 7.28
11/22/10 6.90
02/24/11 7.86
05/26/11 7.11
08/25/11 5.89
02/27/12 7.55
08/09/12 6.46
02/20/13 8.55
MW-13 01/11/08 9.94
02/26/08 8.98
06/26/08 9.83
Page 6 of 13
Table 1
Historical Depth to Groundwater
Gunnison Remediation
Gunnison, Utah
15 South Main Street
MW-14 01/11/08 12.34
02/26/08 12.23
06/26/08 12.07
11/18/08 11.15
12/01/08 11.31
12/09/08 11.43
01/27/09 11.41
02/03/09 11.41
02/10/09 11.40
02/17/09 11.38
02/24/09 11.39
03/10/09 11.86
03/17/09 11.98
03/27/09 12.31
04/02/09 12.43
04/08/09 12.52
04/15/09 12.16
04/28/09 12.23
05/05/09 11.81
05/11/09 11.96
05/20/09 11.76
05/27/09 11.82
06/10/09 11.25
06/18/09 11.07
06/23/09 10.91
07/08/09 11.27
07/21/09 11.27
08/04/09 10.90
08/12/09 10.86
09/16/09 10.87
09/30/09 10.41
10/15/09 10.58
11/03/09 10.59
05/18/10 11.87
06/30/10 9.87
07/13/10 10.56
08/02/10 10.71
09/21/10 10.68
11/22/10 10.20
02/24/11 11.04
05/26/11 10.19
08/25/11 8.87
02/27/12 10.62
08/09/12 9.67
02/20/13 11.92
MW-15 02/26/08 12.51
MW-17 02/26/08 14.56
11/18/08 13.19
02/17/09 14.17
05/11/09 14.46
07/21/09 13.20
08/04/09 13.30
11/11/09 12.67
02/22/10 14.41
05/18/10 14.15
08/02/10 12.78
MW-18 02/26/08 18.48
MW-19 10/22/08 14.78
11/18/08 14.99
02/17/09 14.67
05/11/09 16.39
08/04/09 15.02
11/11/09 14.54
02/22/10 16.04
05/18/10 15.77
08/02/10 14.59
Page 7 of 13
Table 1
Historical Depth to Groundwater
Gunnison Remediation
Gunnison, Utah
15 South Main Street
MW-20 10/22/08 15.40
11/18/08 15.68
02/17/09 15.86
05/11/09 16.98
08/04/09 15.72
11/11/09 15.11
02/22/10 16.81
04/03/10 16.87
04/14/10 16.85
05/05/10 16.77
05/18/10 16.55
07/13/10 15.03
08/02/10 14.82
11/22/10 14.45
02/24/11 15.88
05/26/11 15.02
06/24/11 14.02
08/25/11 13.44
02/27/12 15.41
08/09/12 13.95
02/20/13 16.79
08/14/13 15.36
02/12/14 16.86
08/04/14 15.92
MW-21 10/22/08 10.05
11/18/08 10.17
02/17/09 11.00
05/11/09 11.52
08/04/09 9.82
11/11/09 9.52
02/22/10 10.85
05/18/10 10.30
08/02/10 9.00
MW-22 10/22/08 12.70
11/18/08 10.18
11/24/08 10.28
02/17/09 13.20
05/11/09 10.47
08/04/09 10.05
11/11/09 9.35
02/22/10 11.28
03/24/10 11.20
04/03/10 11.26
04/14/10 11.22
05/05/10 10.59
05/18/10 10.30
07/13/10 9.08
08/02/10 8.88
11/22/10 8.91
02/24/11 9.99
05/26/11 9.49
08/25/11 8.04
02/27/12 9.83
08/10/12 8.16
Page 8 of 13
Table 1
Historical Depth to Groundwater
Gunnison Remediation
Gunnison, Utah
15 South Main Street
MW-23 10/22/08 8.61
11/18/08 12.93
11/24/08 13.03
12/09/08 13.30
02/17/09 13.28
03/27/09 14.12
04/08/09 14.28
04/15/09 14.33
04/28/09 14.37
05/11/09 14.29
05/20/09 14.19
05/27/09 14.08
06/10/09 13.94
06/18/09 13.81
06/23/09 13.76
07/08/09 13.56
07/21/09 13.39
08/04/09 13.10
08/12/09 13.02
09/16/09 12.65
09/30/09 12.55
10/15/09 12.33
11/03/09 12.29
11/11/09 12.40
12/23/09 13.01
01/27/10 13.66
02/22/10 13.84
03/24/10 13.89
04/03/10 13.92
04/14/10 13.90
05/05/10 13.39
05/18/10 13.24
07/13/10 12.75
08/02/10 12.50
09/21/10 12.17
11/22/10 11.98
02/24/11 13.24
05/26/11 12.81
06/24/11 12.28
08/25/11 11.37
02/27/12 12.89
08/10/12 11.64
02/20/13 13.87
MW-24 10/22/08 9.99
11/18/08 8.78
11/24/08 8.88
02/17/09 9.96
05/11/09 11.88
08/04/09 8.60
11/11/09 8.07
02/22/10 9.77
05/18/10 9.00
08/02/10 7.58
MW-25 10/22/08 14.24
11/18/08 14.48
02/17/09 15.16
05/11/09 16.04
08/04/09 14.29
11/11/09 14.01
02/22/10 15.53
05/18/10 15.15
08/02/10 13.81
11/22/10 13.62
02/24/11 14.87
05/26/11 14.23
08/25/11 13.12
02/27/12 14.66
08/09/12 13.59
02/20/13 15.71
Page 9 of 13
Table 1
Historical Depth to Groundwater
Gunnison Remediation
Gunnison, Utah
15 South Main Street
MW-26 10/22/08 12.61
11/18/08 13.18
02/17/09 13.94
05/11/09 14.82
08/04/09 13.00
11/11/09 12.50
02/22/10 14.30
03/24/10 14.41
04/03/10 14.46
04/14/10 14.45
05/05/10 13.94
05/18/10 13.77
07/13/10 12.54
08/02/10 12.33
11/22/10 12.02
02/24/11 13.53
05/26/11 12.83
08/25/11 11.40
02/27/12 13.27
08/09/12 11.92
02/20/13 14.52
08/14/13 12.21
02/12/14 14.60
08/04/14 12.19
02/16/22 15.76
MW-27 10/22/08 12.42
11/18/08 12.74
02/17/09 13.65
05/11/09 14.43
08/04/09 12.52
11/11/09 11.95
02/22/10 13.87
03/24/10 13.97
04/03/10 14.01
04/14/10 13.97
05/05/10 13.44
05/18/10 13.26
07/13/10 11.86
08/02/10 11.67
11/22/10 11.35
02/24/11 12.93
05/26/11 12.16
06/24/11 11.39
08/25/11 10.46
02/27/12 12.46
08/09/12 11.07
02/20/13 13.98
08/14/13 11.59
02/12/14 14.08
08/04/14 11.52
02/12/15 14.01
08/04/15 13.66
02/03/16 14.80
08/01/16 13.47
02/07/17 14.49
08/03/17 12.93
02/07/18 14.01
08/09/18 12.42
02/05/19 15.02
08/08/19 12.62
02/06/20 13.16
08/11/20 12.14
02/08/21 14.17
08/12/21 dry
02/16/22 dry
09/20/22 dry
02/08/23 dry
08/09/23 12.81
Page 10 of 13
Table 1
Historical Depth to Groundwater
Gunnison Remediation
Gunnison, Utah
15 South Main Street
MW-28 10/22/08 13.41
11/18/08 13.76
02/17/09 13.47
05/11/09 15.57
08/04/09 13.93
11/11/09 12.93
02/22/10 14.98
05/18/10 14.66
08/02/10 13.17
MW-29 10/22/08 13.75
11/18/08 13.99
02/17/09 14.07
05/11/09 15.27
08/04/09 13.75
05/18/10 14.99
07/13/10 13.20
08/02/10 13.03
11/22/10 12.52
02/24/11 14.19
05/26/11 13.36
08/25/11 11.57
02/27/12 13.90
08/09/12 12.15
02/20/13 15.16
MW-30 10/22/08 10.97
11/18/08 11.08
02/17/09 11.31
05/11/09 11.51
08/04/09 10.74
11/11/09 10.63
02/22/10 11.54
05/18/10 11.42
08/02/10 10.61
MW-31 10/22/08 10.94
11/18/08 11.15
02/17/09 12.33
05/11/09 13.02
08/04/09 11.04
11/11/09 10.29
02/22/10 12.14
05/18/10 11.34
08/02/10 9.77
MW-32 05/11/09 9.25
08/04/09 8.87
11/11/09 8.75
02/22/10 9.08
05/18/10 8.80
08/02/10 8.53
MW-33 05/11/09 14.95
06/10/09 14.62
08/04/09 14.92
11/11/09 15.42
02/22/10 15.38
05/18/10 15.04
08/02/10 14.21
MW-34 05/11/09 17.93
08/04/09 14.51
11/11/09 14.05
02/22/10 17.31
05/18/10 16.89
08/02/10 14.07
MW-35 05/11/09 15.73
08/04/09 13.86
11/11/09 13.14
02/22/10 15.24
05/18/10 14.93
08/02/10 13.23
MW-36 05/11/09 11.76
08/04/09 9.37
11/11/09 9.02
02/22/10 11.09
04/03/10 11.18
04/14/10 10.98
05/05/10 10.24
05/18/10 10.08
07/13/10 8.48
08/02/10 8.72
Page 11 of 13
Table 1
Historical Depth to Groundwater
Gunnison Remediation
Gunnison, Utah
15 South Main Street
MW-37 05/11/09 16.64
08/04/09 14.45
11/11/09 14.02
01/27/10 15.15
02/22/10 15.38
02/22/10 15.38
03/24/10 15.44
04/03/10 15.41
04/14/10 15.45
05/05/10 15.32
05/18/10 15.15
07/13/10 13.69
08/02/10 13.70
11/22/10 13.56
02/24/11 14.44
05/26/11 13.70
08/25/11 11.72
02/27/12 13.55
08/09/12 12.97
11/11/09 15.91
02/22/10 17.31
05/18/10 17.05
08/02/10 15.50
11/11/09 15.59
02/22/10 16.91
05/18/10 16.63
08/02/10 15.30
11/22/10 15.12
02/24/11 15.97
05/26/11 15.24
08/25/11 13.25
02/27/12 14.73
08/09/12 14.61
11/11/09 15.57
02/22/10 16.71
05/18/10 16.47
08/02/10 15.33
11/22/10 15.17
02/24/11 15.91
05/26/11 15.19
06/24/11 6.31
08/25/11 13.41
02/27/12 14.69
08/09/12 14.76
MW-38
MW-39
MW-40
Page 12 of 13
Table 1
Historical Depth to Groundwater
Gunnison Remediation
Gunnison, Utah
15 South Main Street
MW-41 02/20/13 12.77
08/14/13 10.06
02/12/14 12.50
08/04/14 10.48
02/12/15 12.87
08/04/15 12.55
02/03/16 14.51
08/01/16 12.36
02/07/17 13.36
08/03/17 11.59
02/07/18 12.93
08/09/18 11.60
02/05/19 13.95
08/08/19 11.61
02/06/20 12.04
08/11/20 10.78
02/08/21 13.14
08/12/21 13.92
02/16/22 14.32
09/20/22 13.55
02/08/23 13.74
08/09/23 11.88
02/20/13 18.50
04/17/13 17.14
08/14/13 13.43
02/12/14 15.37
08/04/14 15.03
02/12/15 dry
08/04/15 dry
02/03/16 17.32
08/01/16 17.76
02/07/17 13.42
08/03/17 11.64
02/07/18 13.02
02/16/22 13.98
MW-43
MW-42
Page 13 of 13

Appendix B

Table 2 – Historical Groundwater Chemistry

Sample
Identity Date
TPH-GRO
(mg/L)
C6-C10
TPH-DRO
(mg/L)
C11-C15
Benzene
(mg/L)
Toluene
(mg/L)
Ethyl-
Benzene
(mg/L)
Xylenes
(mg/L)
Naph-
thalene
(mg/L)
Depth to
Groundwater (ft)
Initial
Screening
Level
1 1 0.005 1 0.7 10 0.7 ---
11/27/07 7.8 0.032 2.8 0.85 0.02 3.8 0.048 11.55
1/11/08 4.6 <0.020 1.3 0.4 <0.020 1.6 0.051 11.98
6/26/08 0.082 <0.020 0.029 0.003 <0.002 <0.002 0.039 11.64
11/27/07 5.9 0.022 2.4 0.96 0.027 2.3 0.037 11.84
6/26/08 0.46 0.025 0.13 0.0031 0.0028 0.063 0.054 11.99
11/19/08 0.052 <0.020 0.01 <0.0020 <0.0020 <0.0020 0.0079 11.70
2/18/09 0.47 <0.020 0.0047 <0.0020 <0.0020 <0.0020 0.0048 11.96
5/13/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 12.41
8/5/09 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 11.62
11/11/09 <0.020 ---<0.0020 <0.0020 <0.0020 <0.0020 <0.0020 11.38
2/23/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 12.16
5/20/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 12.02
8/3/10 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 11.41
11/27/07 9.7 0.041 2.6 2.5 0.2 3.9 0.071 11.28
6/26/08 0.23 0.067 0.012 0.002 <0.002 0.015 0.065 11.40
11/19/08 <0.020 <0.020 0.001 <0.0020 <0.0020 <0.020 0.0048 11.04
2/18/09 0.027 <0.020 <0.010 <0.020 <0.020 <0.020 <0.020 11.26
5/13/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 11.50
8/6/09 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 10.80
11/11/09 <0.020 ---<0.0020 <0.0020 <0.0020 <0.0020 <0.0020 10.62
2/23/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 11.56
11/27/07 <0.020 <0.020 <0.002 <0.020 <0.020 <0.002 <0.002 12.36
6/26/08 <0.020 <0.020 <0.002 <0.002 <0.002 <0.002 <0.002 11.70
11/27/07 6.3 0.036 4 0.62 0.057 1.0 0.089 NM
1/11/08 8.2 0.021 4.1 0.88 0.11 0.49 0.15 15.11
6/26/08 0.73 0.099 0.043 <0.002 0.071 0.023 0.11 14.77
11/19/08 1 0.260 0.0097 0.0026 0.19 0.0027 0.017 13.24
2/18/09 4.8 0.130 0.0025 <0.0020 0.2 <0.0020 <0.0020 14.51
5/12/09 0.084 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 15.35
8/6/09 0.086 ---0.001 <0.0020 <0.0020 0.0075 <0.0020 13.05
11/11/09 <0.020 ---<0.0020 <0.0020 0.0032 <0.0020 <0.0020 12.31
2/23/10 0.036 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 14.62
5/20/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 13.94
8/3/10 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 11.89
11/22/10 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 11.46
2/24/11 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 13.41
2/16/22 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 16.00
MW-6 6/26/08 0.035 <0.020 <0.002 <0.002 <0.002 0.0034 0.0026 11.62
1/11/08 3.9 <0.020 1.4 0.32 <0.020 1.5 <0.020 12.55
6/26/08 <0.020 <0.020 <0.002 <0.002 <0.002 <0.002 <0.002 11.91
1/11/08 4.7 0.020 0.9 0.21 <0.0020 1.8 0.081 12.95
6/26/08 <0.020 <0.020 <0.002 <0.002 <0.002 <0.002 <0.002 12.04
1/11/08 <0.020 <0.020 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020 15.05
6/26/08 <0.020 <0.020 <0.002 <0.002 <0.002 <0.002 <0.002 14.37
11/18/08 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 13.61
2/19/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 14.20
5/13/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 14.84
8/6/09 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 13.34
11/11/09 <0.020 ---<0.0020 <0.0020 <0.0020 <0.0020 <0.0020 12.92
2/23/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 14.51
Table 2
Gunnison Remediation
15 South Main Street
Gunnison, Utah
MW-2
MW-9
MW-3
MW-5
MW-8
Historical Groundwater Chemistry
MW-1
MW-7
MW-4
Page 1 of 9
Sample
Identity Date
TPH-GRO
(mg/L)
C6-C10
TPH-DRO
(mg/L)
C11-C15
Benzene
(mg/L)
Toluene
(mg/L)
Ethyl-
Benzene
(mg/L)
Xylenes
(mg/L)
Naph-
thalene
(mg/L)
Depth to
Groundwater (ft)
Table 2
Gunnison Remediation
15 South Main Street
Gunnison, Utah
Historical Groundwater Chemistry
MW-10 --- --- --- --- --- --- ---Dry
1/11/08 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 10.08
6/26/08 <0.020 <0.020 <0.002 <0.002 <0.002 <0.002 <0.002 10.35
1/11/08 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 10.60
6/26/08 <0.020 <0.020 <0.002 <0.002 <0.002 <0.002 <0.002 8.72
1/11/08 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 9.94
6/26/08 <0.020 <0.020 <0.002 <0.002 <0.002 <0.002 <0.002 9.83
1/11/08 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 12.34
6/26/08 <0.020 <0.020 <0.002 <0.002 <0.002 <0.002 <0.002 12.07
11/18/08 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 11.15
2/19/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 11.38
5/13/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 11.96
8/6/09 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 10.90
5/19/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 11.87
8/3/10 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 10.71
2/27/08 1.1 <0.020 0.49 0.039 <0.0020 0.45 0.0043 12.51
6/26/08*------------------------
MW-16 --- --- --- --- --- --- --- ---Dry
2/27/08 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 14.56
6/26/08 0.22 <0.020 0.089 <0.002 <0.002 0.024 0.0056 NM
11/18/08 0.56 <0.020 0.28 0.0023 <0.0020 0.0034 0.0082 13.19
2/19/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 14.17
5/13/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 14.46
8/6/09 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 13.30
11/11/09 <0.020 ---<0.0020 <0.0020 <0.0020 <0.0020 <0.0020 12.67
2/23/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 14.41
MW-18 6/26/08 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 NM
11/18/08 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 14.99
2/19/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 14.67
5/13/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 16.39
8/5/09 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 15.02
11/11/09 <0.020 ---<0.0020 <0.0020 <0.0020 <0.0020 <0.0020 14.54
2/23/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 16.04
11/18/08 4.1 0.130 2.7 0.014 0.21 0.6 0.18 15.68
2/19/09 14 0.170 2.6 0.068 0.6 0.72 0.16 15.86
5/13/09 3 0.084 1.4 0.026 0.25 0.056 0.18 16.98
8/5/09 2.7 ---1.3 0.037 0.33 0.035 0.2 15.72
11/11/09 5.3 ---1.3 0.028 0.3 0.027 0.22 15.11
2/23/10 1.6 ---0.67 0.015 0.19 0.0066 0.053 16.81
5/20/10 1.3 ---0.39 0.0089 0.076 0.0065 0.032 16.55
8/3/10 0.848 ---0.277 0.0093 0.050 0.0063 0.026 14.82
11/22/10 0.590 ---0.00469 <0.00200 <0.00200 0.00244 <0.00200 14.45
2/24/11 0.639 ---0.00509 <0.00200 <0.00200 0.00351 0.0039 15.88
5/26/11 0.998 ---0.00187 <0.00200 <0.00200 <0.00200 <0.00200 15.02
8/25/11 0.568 ---<0.00100 <0.00200 <0.00200 <0.00200 0.0032 13.44
2/27/12 0.318 ---0.0121 <0.00200 <0.00200 <0.00200 0.00236 15.41
8/9/12 0.415 ---<0.00100 <0.00200 <0.00200 <0.00200 0.00257 13.95
2/20/13 0.256 ---0.00263 <0.00200 <0.00200 <0.00200 <0.00200 16.79
8/14/13 0.126 ---<0.00100 <0.00200 <0.00200 0.00606 0.00229 15.36
2/12/14 0.235 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 16.86
8/4/14 0.098 ---<0.0010 <0.0010 <0.0010 <0.0030 <0.0010 15.92
MW-14
MW-19
MW-17
MW-20
MW-11
MW-12
MW-15
MW-13
Page 2 of 9
Sample
Identity Date
TPH-GRO
(mg/L)
C6-C10
TPH-DRO
(mg/L)
C11-C15
Benzene
(mg/L)
Toluene
(mg/L)
Ethyl-
Benzene
(mg/L)
Xylenes
(mg/L)
Naph-
thalene
(mg/L)
Depth to
Groundwater (ft)
Table 2
Gunnison Remediation
15 South Main Street
Gunnison, Utah
Historical Groundwater Chemistry
11/18/08 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 10.17
2/19/09 <0.020 <0.020 <0.0010 0.0025 <0.0020 <0.0020 <0.0020 11.00
5/13/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 11.52
8/5/09 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 9.82
11/11/09 <0.020 ---<0.0020 <0.0020 <0.0020 <0.0020 <0.0020 9.52
2/23/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 10.85
5/19/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 10.30
8/3/10 <0.0200 ---<0.0100 <0.00200 <0.00200 <0.00200 <0.00200 9.00
11/18/08 1.2 0.044 0.42 0.013 <0.0020 0.0034 0.11 10.18
2/19/09 2.3 0.034 0.21 0.0069 0.003 0.004 0.0094 13.20
5/13/09 0.42 <0.020 0.24 0.0035 <0.0020 <0.0020 <0.0020 10.47
8/5/09 0.32 ---0.19 0.003 0.0035 <0.0020 0.0089 10.05
11/11/09 1.7 ---0.44 0.0074 0.0027 0.0024 0.027 9.35
2/23/10 0.22 ---0.11 0.0027 0.018 <0.0020 0.0020 11.28
5/20/10 0.58 ---0.22 0.023 0.013 0.16 0.0089 10.30
8/3/10 0.287 ---0.0777 <0.00200 0.00212 <0.00200 <0.00200 8.88
11/22/10 0.111 ---0.00125 <0.00200 <0.00200 0.00215 <0.00200 8.91
2/24/11 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 9.99
5/26/11 0.0940 ---0.00650 <0.00200 <0.00200 <0.00200 <0.00200 9.49
8/25/11 0.0524 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 8.04
2/27/12 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 9.83
8/10/12 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 8.16
11/18/08 11 <1.0 1.2 0.4 0.9 2.1 0.22 12.93
2/19/09 16 <0.40 1.3 0.091 1.6 2.9 0.49 13.28
5/12/09 2.7 <0.20 0.47 0.046 0.72 0.78 0.063 14.29
8/5/09 2.8 ---0.57 0.025 0.81 0.7 0.22 13.10
11/11/09 2.5 ---0.2 0.0094 0.4 0.31 0.21 12.40
2/23/10 1.7 ---0.090 0.0021 0.39 0.40 0.17 13.84
5/20/10 0.73 ---0.065 0.0050 0.25 0.029 0.11 13.24
8/3/10 0.998 ---0.0576 0.00563 0.201 0.0322 0.158 12.50
11/22/10 1.69 ---0.0180 0.00284 0.499 0.00544 0.228 11.98
2/24/11 1.61 ---0.00568 <0.00200 0.194 0.0318 0.161 13.24
5/26/11 0.424 ---0.00563 <0.00200 0.0339 <0.00200 0.0195 12.81
8/25/11 0.492 ---0.02890 <0.00200 <0.00200 0.0072 0.137 11.37
2/27/12 0.131 ---0.00130 <0.00200 0.00799 <0.00200 0.00334 12.89
8/10/12 0.986 ---0.00659 <0.00200 0.00585 0.0115 0.123 11.64
2/20/13 0.214 ---0.00301 <0.00200 0.0281 0.0135 0.00856 13.87
11/18/08 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 8.78
2/19/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 9.96
5/13/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 11.88
8/5/09 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 8.60
11/11/09 <0.020 ---<0.0020 <0.0020 <0.0020 <0.0020 <0.0020 8.07
2/23/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 9.77
5/19/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 9.00
8/4/10 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 7.58
MW-24
MW-21
MW-22
MW-23
Page 3 of 9
Sample
Identity Date
TPH-GRO
(mg/L)
C6-C10
TPH-DRO
(mg/L)
C11-C15
Benzene
(mg/L)
Toluene
(mg/L)
Ethyl-
Benzene
(mg/L)
Xylenes
(mg/L)
Naph-
thalene
(mg/L)
Depth to
Groundwater (ft)
Table 2
Gunnison Remediation
15 South Main Street
Gunnison, Utah
Historical Groundwater Chemistry
11/18/08 2 0.380 0.42 0.021 0.24 0.29 0.17 14.48
2/19/09 13 0.220 0.19 0.012 0.28 0.25 0.12 15.16
5/12/09 0.61 0.028 0.031 <0.0020 0.033 0.0052 0.044 16.04
8/5/09 0.61 ---0.029 0.0022 0.055 0.0054 0.059 14.29
11/11/09 0.5 ---0.0052 <0.0020 0.0094 <0.0020 0.0086 14.01
2/23/10 0.45 ---0.0024 <0.0020 0.036 <0.0020 0.033 15.53
5/19/10 0.32 ---0.0023 <0.0020 0.0023 <0.0020 0.0078 15.15
8/3/10 0.240 ---0.00200 <0.00200 <0.00200 <0.00200 <0.00200 13.81
11/22/10 0.0561 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 13.62
2/24/11 0.291 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 14.87
5/26/11 0.653 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 14.23
8/25/11 0.0880 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 13.12
2/28/12 0.0504 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 14.66
8/9/12 <0.0200 ---<0.00100 0.00235 <0.00200 0.00325 <0.00200 13.59
2/20/13 0.0937 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 15.71
11/18/08 4.9 <0.40 1.1 0.044 0.19 0.27 0.061 13.18
2/19/09 9.9 0.570 1.2 0.064 0.71 1 0.62 13.94
5/12/09 1.9 0.130 0.38 0.015 0.2 0.087 0.076 14.82
8/5/09 0.7 ---0.21 0.008 0.059 0.021 0.086 13.00
11/11/09 2.3 ---0.24 0.15 0.15 0.14 0.092 12.50
2/24/10 1.3 ---0.10 0.0066 0.23 0.17 0.12 14.30
5/20/10 0.65 ---0.047 0.0063 0.053 0.037 0.029 13.77
8/3/10 0.924 ---0.322 0.0125 0.0207 0.0227 0.0236 12.33
11/22/10 1.21 ---0.0906 0.00324 0.117 0.00849 0.00532 12.02
2/24/11 1.10 ---0.0247 <0.00200 0.0599 0.00746 0.00585 13.53
5/26/11 0.642 ---0.0367 <0.00200 0.00940 0.00521 <0.00200 12.83
8/25/11 0.882 ---0.119 0.00907 0.06810 0.0195 0.00761 11.40
2/28/12 0.905 ---0.0185 <0.00200 0.0893 0.00695 0.00382 13.27
8/9/12 0.228 ---0.0137 <0.00200 0.0143 0.00485 0.00393 11.92
2/20/13 0.285 ---0.00606 <0.00200 0.0188 0.00826 0.00526 14.52
8/14/13 0.0763 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 12.21
2/12/14 0.182 ---0.00101 <0.00200 <0.00200 <0.00200 <0.00200 14.60
8/4/14 <0.050 ---<0.0010 <0.0010 <0.0010 <0.0030 <0.0010 12.19
2/16/22 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 15.76
MW-26
MW-25
Page 4 of 9
Sample
Identity Date
TPH-GRO
(mg/L)
C6-C10
TPH-DRO
(mg/L)
C11-C15
Benzene
(mg/L)
Toluene
(mg/L)
Ethyl-
Benzene
(mg/L)
Xylenes
(mg/L)
Naph-
thalene
(mg/L)
Depth to
Groundwater (ft)
Table 2
Gunnison Remediation
15 South Main Street
Gunnison, Utah
Historical Groundwater Chemistry
11/18/08 94 <2.0 26 36 2.9 16 0.26 12.74
2/19/09 100 <4.0 35 41 3.2 21 <0.40 13.65
5/12/09 44 <0.40 13 18 1.0 7.8 0.2 14.43
8/5/09 51 ---13 24 1.8 10 0.3 12.52
11/11/09 120 ---22 54 4.1 34 0.57 11.95
2/24/10 41 ---9.0 19 1.5 9.0 0.27 13.87
5/20/10 43 ---9.0 20 1.4 9.7 0.23 13.26
8/3/10 64.9 ---7.29 36.5 2.59 16.2 0.265 11.67
11/22/10 50.9 ---2.87 25.9 2.54 16.0 0.490 11.35
2/24/11 30.9 ---0.789 17.1 1.46 11.0 0.276 12.93
5/26/11 43.4 ---0.703 22.4 2.44 16.3 <0.200 12.16
8/25/11 40.9 ---0.426 19.1 2.49 17.2 0.462 10.46
2/28/12 29.3 ---0.325 9.36 1.37 9.44 0.251 12.46
8/9/12 42.7 ---0.663 13.2 3.60 22.7 0.538 11.07
2/21/13 15.5 ---0.237 4.36 1.08 6.31 0.190 13.98
8/14/13 19.5 ---0.453 2.66 2.72 12.3 0.354 11.59
2/12/14 8.87 ---0.0957 0.612 1.18 5.54 0.233 14.08
8/5/14 41.000 ---0.100 0.310 1.600 6.440 0.210 11.52
2/12/15 9.35 ---0.106 0.165 1.38 6.23 0.219 14.01
8/4/15 7.32 ---0.101 0.0961 1.17 4.20 0.201 13.66
2/4/16 0.365 ---0.00530 0.00612 <0.00200 0.251 0.0131 14.80
8/1/16 5.68 ---0.0995 0.572 0.898 3.30 0.145 13.47
2/8/17 3.02 ---0.0334 0.251 0.487 1.20 0.119 14.49
8/3/17 6.98 ---0.0707 0.674 1.14 3.66 0.237 12.93
2/7/18 10.7 ---0.0822 1.50 1.76 5.32 0.268 14.01
8/9/18 11.8 ---0.168 1.34 2.05 5.52 0.466 12.42
2/5/19
8/8/19 6.24 ---0.106 0.623 1.17 3.33 0.256 12.62
2/6/20 13.9 ---0.166 1.42 2.11 7.70 0.478 13.16
8/11/20 11.3 ---0.0834 0.889 1.77 5.20 0.781 12.14
2/8/21 7.63 ---0.0707 0.696 1.33 4.05 0.285 14.17
8/12/21
2/16/22
9/20/22
2/8/23
8/9/23 20.1 ---0.037 0.336 1.61 4.67 0.525 12.81
Insufficient water for sampling
Insufficient water for sampling
Insufficient water for sampling
Insufficient water for sampling
Insufficient water for sampling
MW-27
Page 5 of 9
Sample
Identity Date
TPH-GRO
(mg/L)
C6-C10
TPH-DRO
(mg/L)
C11-C15
Benzene
(mg/L)
Toluene
(mg/L)
Ethyl-
Benzene
(mg/L)
Xylenes
(mg/L)
Naph-
thalene
(mg/L)
Depth to
Groundwater (ft)
Table 2
Gunnison Remediation
15 South Main Street
Gunnison, Utah
Historical Groundwater Chemistry
11/18/08 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 13.76
2/19/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 13.47
5/12/09 <0.020 <0.020 0.0036 <0.0020 <0.0020 <0.0020 <0.0020 15.57
8/5/09 <0.020 ---<.0010 <0.0020 <0.0020 <0.0020 <0.0020 13.93
11/11/09 <0.020 ---<0.0020 <0.0020 <0.0020 <0.0020 <0.0020 12.93
2/24/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 14.98
5/19/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 14.66
8/3/10 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 13.17
11/18/08 20 <0.20 0.1 <0.020 0.56 2.7 0.28 13.99
2/19/09 11 0.410 0.022 <0.020 0.24 0.55 0.22 14.07
5/13/09 2.1 0.220 <0.010 <0.020 0.076 0.13 0.094 15.27
8/6/09 1.2 ---<0.0010 <0.0020 0.025 0.014 0.057 13.75
5/19/10 1.1 ---<0.0010 <0.0020 0.0054 <0.0020 0.011 14.99
8/4/10 0.566 ---<0.00100 <0.00200 <0.00200 <0.00200 0.00242 13.03
11/22/10 0.499 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 12.52
2/24/11 2.01 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 14.19
5/26/11 1.32 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 13.36
8/25/11 0.216 ---<0.00100 <0.00200 <0.00200 <0.00200 0.00230 11.57
2/27/12 0.218 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 13.90
8/9/12 0.185 ---<0.00100 <0.00200 <0.00200 <0.00200 0.00240 12.15
2/21/13 0.369 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 15.16
11/18/08 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 11.08
2/19/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.002 <0.0020 11.31
5/13/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 11.51
8/6/09 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 10.74
11/11/09 <0.020 ---<0.0020 <0.0020 <0.0020 <0.0020 <0.0020 10.63
2/24/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 11.54
11/18/08 <0.020 <0.020 <0.0010 <0.0020 0.0027 0.0056 0.0034 11.15
2/19/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 12.33
5/13/09 <0.020 <0.020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 13.02
8/5/09 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 11.04
11/11/09 <0.020 ---<0.0020 <0.0020 <0.0020 <0.0020 <0.0020 10.29
2/24/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 12.14
5/19/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 11.34
8/4/10 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 9.77
5/13/09 <0.020 <0.020 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020 9.25
8/6/09 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 8.87
11/11/09 <0.020 ---<0.0020 <0.0020 <0.0020 <0.0020 <0.0020 8.75
2/24/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 9.08
5/19/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 8.80
8/4/10 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 8.53
5/13/09 <0.020 <0.020 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020 14.95
8/5/09 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 14.92
11/11/09 <0.020 ---<0.0020 <0.0020 <0.0020 <0.0020 <0.0020 15.42
2/24/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 15.38
MW-28
MW-29
MW-31
MW-32
MW-33
MW-30
Page 6 of 9
Sample
Identity Date
TPH-GRO
(mg/L)
C6-C10
TPH-DRO
(mg/L)
C11-C15
Benzene
(mg/L)
Toluene
(mg/L)
Ethyl-
Benzene
(mg/L)
Xylenes
(mg/L)
Naph-
thalene
(mg/L)
Depth to
Groundwater (ft)
Table 2
Gunnison Remediation
15 South Main Street
Gunnison, Utah
Historical Groundwater Chemistry
5/13/09 <0.020 <0.020 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020 17.93
8/5/09 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 14.51
11/11/09 <0.020 ---<0.0020 <0.0020 <0.0020 <0.0020 <0.0020 14.05
2/24/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 17.31
5/19/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 16.89
8/4/10 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 14.07
5/12/09 <0.020 <0.020 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020 15.73
8/5/09 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 13.86
11/11/09 <0.020 ---<0.0020 <0.0020 <0.0020 <0.0020 <0.0020 13.14
2/24/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 15.24
5/19/10 <0.0020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 14.93
8/4/10 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 13.23
5/13/09 0.047 <0.020 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020 11.76
8/5/09 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 9.37
11/11/09 <0.020 ---<0.0020 <0.0020 <0.0020 <0.0020 <0.0020 9.02
2/24/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 11.09
5/20/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 10.08
8/3/10 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 8.72
5/13/09 2.3 0.064 0.67 0.011 0.13 0.0027 0.11 16.64
8/5/09 1.2 ---0.46 0.0086 <0.0020 <0.0020 0.027 14.45
11/11/09 1.3 ---0.078 <0.0020 0.0021 0.0043 <0.0020 14.02
2/24/10 0.55 ---0.085 0.0034 0.0071 <0.0020 <0.0020 15.38
5/20/10 0.19 ---0.0033 <0.0020 <0.0020 <0.0020 <0.0020 15.15
8/4/10 0.0899 ---0.00384 <0.00200 <0.00200 <0.00200 <0.00200 13.70
11/22/10 0.0374 ---0.00157 <0.00200 <0.00200 <0.00200 <0.00200 13.56
2/24/11 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 14.44
5/26/11 0.0774 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 13.70
8/25/11 0.0279 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 11.72
2/27/12 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 13.55
8/9/12 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 12.97
11/11/09 <0.020 ---<0.0020 <0.0020 <0.0020 <0.0020 <0.0020 15.91
2/24/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 17.31
11/11/09 <0.020 ---0.0021 <0.0020 <0.0020 0.003 <0.0020 15.59
2/24/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 16.91
5/19/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 16.63
8/4/10 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 15.30
11/22/10 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 15.12
11/11/09 0.69 ---0.026 <0.0020 <0.0020 0.0041 <0.0020 15.57
2/24/10 0.29 ---0.022 <0.0020 0.0021 <0.0020 <0.0020 16.71
5/19/10 0.12 ---0.0017 <0.0020 <0.0020 <0.0020 <0.0020 16.47
8/4/10 0.0378 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 15.33
11/22/10 0.0478 ---0.00104 <0.00200 <0.00200 <0.00200 <0.00200 15.17
2/24/11 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 15.91
5/26/11 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 15.19
8/25/11 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 13.41
2/27/12 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 14.69
MW-34
MW-35
MW-36
MW-37
MW-40
MW-38
MW-39
Page 7 of 9
Sample
Identity Date
TPH-GRO
(mg/L)
C6-C10
TPH-DRO
(mg/L)
C11-C15
Benzene
(mg/L)
Toluene
(mg/L)
Ethyl-
Benzene
(mg/L)
Xylenes
(mg/L)
Naph-
thalene
(mg/L)
Depth to
Groundwater (ft)
Table 2
Gunnison Remediation
15 South Main Street
Gunnison, Utah
Historical Groundwater Chemistry
9/26/12 39.9 ---6.68 16.5 2.37 10.9 <0.400 10.04
2/21/13 23.1 ---2.38 5.71 1.39 5.66 0.283 12.77
8/14/13 1.65 ---0.674 0.0281 0.417 0.0582 0.00973 10.06
2/12/14 5.39 ---1.68 1.69 0.511 0.629 0.0355 12.50
8/4/14 3.900 ---0.620 0.0046 0.330 0.0056 0.011 10.48
2/12/15 1.58 ---0.427 0.156 0.224 0.229 0.0217 12.87
8/4/15 1.83 ---0.338 0.211 0.196 0.337 0.0197 12.55
2/3/16 10.4 ---0.693 3.14 0.827 3.18 0.108 14.51
8/1/16 9.78 ---1.29 2.98 0.914 3.10 0.152 12.36
2/7/17 1.87 ---0.228 0.0331 0.274 0.368 0.0363 13.36
8/3/17 3.67 ---0.394 0.162 0.639 1.25 0.127 11.59
2/7/18 1.29 ---0.195 0.0129 0.301 0.184 0.0244 12.93
8/9/18 1.18 ---0.200 0.00908 0.230 0.0826 0.0161 11.60
2/5/19 0.566 ---0.0660 0.00274 0.140 0.00222 0.00253 13.95
8/8/19 12.5 ---0.293 1.13 1.67 5.25 0.249 11.61
2/6/20 3.46 ---0.141 0.124 0.627 0.866 0.0982 12.04
8/11/20 2.47 ---0.186 0.0950 0.911 0.735 0.0883 10.78
2/8/21 1.26 ---0.0366 0.00854 0.322 0.0836 0.0127 13.14
8/12/21 0.774 ---0.0356 0.00458 0.262 < 0.00200 0.00289 13.92
2/16/22 2.75 ---0.0348 0.0335 0.527 0.743 0.0962 14.32
9/20/22 13.3 ---0.026 0.043 0.416 0.846 0.143 13.55
2/8/23 2.68 ---0.008 0.022 0.258 0.267 0.032 13.74
8/9/23 11.40 ---0.065 0.200 0.958 2.02 0.205 11.88
2/21/13 Insufficient water for well development and sampling 18.50
4/17/13 0.0760 ---<0.00100 <0.00200 <0.00200 <0.00200 0.00232 17.14
8/15/13 0.285 ---<0.00100 <0.00200 0.00920 0.0153 0.00939 13.43
2/12/14 1.39 ---<0.00100 <0.00200 0.0860 0.0206 0.0227 15.37
8/4/14 0.730 ---<0.0010 <0.0010 0.0082 0.0034 0.0016 15.03
2/12/15 Insufficient water for sampling - Well Partially Plugged ---
8/4/15 Insufficient water for sampling - Well Partially Plugged ---
2/4/16 0.0707 ---0.00234 0.00482 0.00333 0.00946 <0.00200 17.32
8/1/16 Insufficient water for sampling
2/7/17 0.0236 ---0.00342 <0.00200 <0.00200 <0.00200 <0.00200 13.42
8/3/17 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 11.64
2/7/18 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 13.02
2/16/22 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 13.98
11/27/07 8.6 0.041 3 0.96 0.0046 3.9 0.097 16.24
1/4/08 5.8 <0.020 1.2 0.50 <0.0020 2.4 0.11 NM
6/26/08 0.081 <0.020 0.0071 <0.002 <0.002 0.027 0.01 12.29
TW-2 6/26/08 0.92 0.092 0.038 0.0068 <0.002 0.44 0.056 12.76
11/27/07 1.6 <0.020 0.42 0.16 <0.020 0.62 0.032 NM
1/4/08 0.56 <0.020 0.059 0.0093 <0.002 0.25 0.019 NM
6/26/08 <0.020 <0.020 <0.002 <0.002 <0.002 <0.002 <0.002 12.03
1/11/08 27 0.110 6 3.8 0.6 6.4 0.26 17.93
6/26/08 50 0.930 4.3 11 3.3 27 1.3 15.95
1/6/11 1.860 ---0.0508 0.00257 0.117 0.170 0.198 14.90
4/25/20121 <1.0 <1.0 0.0012 <0.001 0.0003 0.0006 0.0021 15.70
3/11/20151 NS NS <0.001 <0.001 <0.001 <0.002 <0.001 17.12
6/17/20161 <1.0 <1.0 <0.001 <0.001 <0.001 <0.002 <0.001 NM
6/26/08 27 0.930 0.6 2.9 1.7 18 1.1 13.46
1/6/11 <0.0200 ---<0.00200 <0.00200 <0.00200 <0.00200 <0.00200 12.75
8/14/07 0.12 NS 0.018 0.0071 <0.0020 0.0022 <0.0020 NM
12/13/07 19 0.200 2.4 2.2 0.6 3.7 0.17 NM
1/11/08 37 <0.200 5.7 3.2 1.1 5.6 0.23 13.19
6/25/08 12 <0.020 2.2 3.6 0.32 4.9 0.12 11.62
WS-1
TW-6
TW-4
TW-3
MW-43
TW-1
MW-42
MW-41
Page 8 of 9
Sample
Identity Date
TPH-GRO
(mg/L)
C6-C10
TPH-DRO
(mg/L)
C11-C15
Benzene
(mg/L)
Toluene
(mg/L)
Ethyl-
Benzene
(mg/L)
Xylenes
(mg/L)
Naph-
thalene
(mg/L)
Depth to
Groundwater (ft)
Table 2
Gunnison Remediation
15 South Main Street
Gunnison, Utah
Historical Groundwater Chemistry
8/14/07 <0.020 NS 0 <0.0020 <0.0020 <0.0020 <0.0020 NM
12/13/07 7 0.025 2.1 1.9 0.14 0.96 0.02 NM
1/11/08 0.088 <0.020 0.058 0.011 0.012 0.043 0.0021 12.61
6/25/08 7.4 <0.020 3.8 0.41 0.23 2.5 <0.02 11.23
11/19/08 3.1 0.082 0.39 0.21 0.11 0.32 0.063 9.93
2/19/09 12 0.073 0.82 0.58 0.19 0.85 0.077 12.19
5/12/09 18 <.40 2.4 3.3 1.5 7 0.97 12.41
8/6/09 <0.020 ---<0.0010 <0.0020 <0.0020 0.0024 <0.0020 9.34
11/11/09 13 ---1.9 1.5 0.81 3 0.2 9.19
2/23/10 <0.020 ---<0.0010 <0.0020 <0.0020 <0.0020 <0.0020 11.81
5/20/10 3.4 ---0.66 0.52 0.20 1.3 0.091 11.61
8/3/10 3.03 ---0.386 0.478 0.232 0.999 0.0876 8.99
11/22/10 0.243 ---0.0164 0.0153 0.00831 0.0366 0.00254 7.67
2/24/11 0.0570 ---<0.00100 <0.00200 <0.00200 0.00225 <0.00200 10.92
5/26/11 1.56 ---0.102 0.205 0.106 0.589 0.0304 9.24
8/25/11 0.403 ---0.0385 0.0351 0.0283 0.117 0.00799 7.35
2/28/12 0.869 ---0.0665 0.0676 0.0709 0.238 0.0560 10.64
8/9/12 1.35 ---0.140 0.0881 0.103 0.305 0.0652 8.61
2/21/13 0.897 ---0.0735 0.0919 0.0626 0.223 0.0176 12.67
8/14/13 0.274 ---0.0426 0.0198 0.0657 0.102 0.0117 8.46
2/12/14 <0.0200 ---<0.00100 <0.00200 <0.00200 <0.00200 <0.00200 11.50
8/5/14 <0.050 ---<0.0010 <0.0010 <0.0010 <0.0030 <0.0010 7.78
WS-3 12/13/07 6.9 0.500 0.12 <0.020 0.28 <0.020 0.1 NM
1/11/08 9.2 <0.020 0.22 <0.020 0.38 0.049 0.084 10.50
6/25/08 0.25 0.077 0.081 <0.002 0.017 0.0073 <0.002 10.21
1 1 0.005 1 0.7 10 0.7 ---
TPH (GRO) = Total Petroleum Hydrocarbons (Gasoline Range C6 to C10)*MW-15 could not be located
TPH (DRO) = Total Petroleum Hydrocarbons (Diesel Range C11 to C15)
< = Concentrations less than the given instrument detection level NS - Not Sampled
SHADED = Measured concentration exceeds Utah Initial Screening Level NM - Not Measured
1 = Samples collected by DERR
WS-2
INITIAL SCREENING LEVEL
Page 9 of 9

Appendix C

Low-Flow Groundwater Sampling Forms

Appendix D

Laboratory Analytical Report

The analyses presented on this report were performed in accordance with the
National Environmental Laboratory Accreditation Program (NELAP) unless
noted in the comments, flags, or case narrative. If the report is to be used for
regulatory compliance, it should be presented in its entirety, and not be
altered.
Client Service Contact: 801.262.7299
Wasatch Environmental
Attn: Mike Cronin
2410 West California Avenue
Salt Lake City, UT 84104
Work Order: 23H0950
Project: Top Stop Gunnison
8/21/2023
Approved By:
Reed Hendricks, Director of Operations
9632 South 500 West Sandy, Utah 84070
Serving the Intermountain West since 1953
801.262.7299 Main 866.792.0093 Fax www.ChemtechFord.com
Page 1 of 5
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Wasatch Environmental
Mike Cronin
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
1241-026A
8/10/23 8:52 @ 0.7 °C
8/21/2023
Top Stop Gunnison
Sample ID: MW-27
Lab ID: 23H0950-01Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 8/9/23 11:40
Preparation
Date/Time
Sampled By: Anna Fiorini
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 8/10/238/10/230.005 EPA 8260D /5030A0.037Benzene
mg/L 8/10/238/10/230.125 EPA 8260D /5030A1.61Ethylbenzene
mg/L 8/10/238/10/230.005 EPA 8260D /5030ANDMethyl tert-Butyl Ether (MTBE)
mg/L 8/10/238/10/230.012 EPA 8260D /5030A0.525Naphthalene
mg/L 8/10/238/10/230.012 EPA 8260D /5030A0.336Toluene
mg/L 8/10/238/10/230.125 EPA 8260D /5030A4.67Xylenes, total
mg/L 8/10/238/10/230.125 EPA 8260D /5030A20.1Gasoline Range Organics
Project Name: Top Stop Gunnison CtF WO#: 23H0950
www.ChemtechFord.com
Page 2 of 5Page 2 of 5
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Wasatch Environmental
Mike Cronin
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
1241-026A
8/10/23 8:52 @ 0.7 °C
8/21/2023
Top Stop Gunnison
Sample ID: MW-41
Lab ID: 23H0950-02Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 8/9/23 12:40
Preparation
Date/Time
Sampled By: Anna Fiorini
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 8/10/238/10/230.005 EPA 8260D /5030A0.065Benzene
mg/L 8/10/238/10/230.012 EPA 8260D /5030A0.958Ethylbenzene
mg/L 8/10/238/10/230.005 EPA 8260D /5030ANDMethyl tert-Butyl Ether (MTBE)
mg/L 8/10/238/10/230.012 EPA 8260D /5030A0.205Naphthalene
mg/L 8/10/238/10/230.012 EPA 8260D /5030A0.200Toluene
mg/L 8/10/238/10/230.012 EPA 8260D /5030A2.02Xylenes, total
mg/L 8/10/238/10/230.125 EPA 8260D /5030A11.4Gasoline Range Organics
Project Name: Top Stop Gunnison CtF WO#: 23H0950
www.ChemtechFord.com
Page 3 of 5Page 3 of 5
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Wasatch Environmental
Mike Cronin
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
1241-026A
8/10/23 8:52 @ 0.7 °C
8/21/2023
Top Stop Gunnison
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: Top Stop Gunnison CtF WO#: 23H0950
www.ChemtechFord.com
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