DERR-2024-010957

Rockwell Solutions, Inc., 718 E. Bridger Lane, Elk Ridge, UT 84651 801-361-2930 [e-mail]
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Rockwell Solutions, Inc.
718 E Bridger Lane
Elk Ridge, UT 84651
[phone]
September 19, 2024

Jay Cahoon
Holiday Oil
3115 West 2100 South
Salt Lake City, UT 84119

Re: Groundwater Monitoring Report, 9/3/24
Holiday Oil #75 Facility ID: 3000562
3047 W 300 North Release ID: OHS
West Point, Utah

Dear Mr. Cahoon:

Rockwell Solutions conducted groundwater monitoring activities at the above-referenced site on
September 3, 2024. Groundwater samples were collected from monitoring wells MW-2 and MW-3.
Sump and Trap removed approximately 208 gallons of water and free product from monitoring
wells MW-1 and MW-4 on April 22, 2024, However, monitoring wells MW-1 and MW-4 still
contained measurable free product and were not sampled.

Free product in MW-4

Groundwater samples from MW-2 and MW-3 were collected using a disposable bailer. Each
groundwater sample was immediately placed on ice and retained under chain-of-custody
documentation until relinquished to the laboratory. Samples were submitted for analysis of MTBE,
benzene, toluene, ethylbenzene, total xylenes, naphthalene (MBTEXN) and total petroleum
GMR September 2024, Holiday Oil #75, West Point, UT, Facility #3000562, Release OHS

Rockwell Solutions, Inc., 718 E. Bridger Lane, Elk Ridge, UT 84651 801-361-2930 [e-mail]
2
hydrocarbons (TPH) - gasoline range organics (GRO) using EPA Method 8260 and TPH-diesel
range organics (DRO) using EPA Method 8015. Chemtech-Ford conducted the laboratory analyses.
Laboratory reports are attached.

A summary of historical groundwater monitoring data including groundwater elevation and
laboratory analytical data is presented in Table 1. Hydrocarbon concentrations were not detected in
the samples from MW-2 and MW-3.

As free product remains in MW-1 and is increasing in MW-4, free product abatement and corrective
action should be taken.

Please feel free to contact me should you have any questions or concerns at 801-361-2930.

Sincerely,

David S Hansen
Rockwell Solutions, Inc.
Certified UST Consultant CC130

cc: Hillary Mason, DERR
MW-3
MW-1
MW-2MW-4
Figure 1
NORTH
Approx. scale in feet
00 40
Holiday Oil #75
3047 W 300 North
West Point, Utah
t MSieap
Monitoring Well
MW-3
MW-1
MW-2MW-4
MW-7
MW-6
MW-5
(85.35) = Groundwater Elevation (ft)
= Groundwater Elevation Contour (ft)
Sample
Number TOC
Elevation
Date
Collected
Depth to
Water (ft)
GW
Elevation
(ft)
MTBE
(mg/L)
Benzene
(mg/L)
Toluene
(mg/L)
Ethyl-
benzene
(mg/L)
Total
Xylenes
(mg/L)
Naph-
thalene
(mg/L)
TPH-
GRO
(mg/L)
TPH-
DRO
(mg/L)
0.2 0.005 1 0.7 10 0.7 1 1
0.2 0.3 3 4 10 0.7 10 10
MW-1 10/25/2023 9.19 90.81
100.00 3/13/2024 7.38 NM
MW-2 10/25/2023 8.44 90.98 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1
99.42 3/13/2024 7.38 92.04 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1
MW-3 10/25/2023 7.87 90.68 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1
98.55 3/13/2024 6.68 91.87 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1
MW-4 10/25/2023 8.47 90.86 <0.005 0.006 <0.012 <0.012 0.019 <0.012 <0.125 2.4
99.33 3/13/2024 7.37 91.96
MW-5 3/13/2024 6.87 91.11 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1
97.98
MW-6 3/13/2024 6.95 91.75 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1
98.70
MW-7 3/13/2024 6.91 92.65 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1
99.56
TPH-GRO = Total petroleum hydrocarbons-gasoline range organics
TPH-DRO = Total petroleum hydrocarbons - diesel range organics
mg/L = milligrams per liter, which approximates parts per million
ISL = Initial Screening Level
Table 1
Groundwater Analytical Results
Holiday Oil #75, 3047 W 300 North, West Point, UT (Fac ID #3000562)
ISL's
RBCA Tier 1 Screening
Not sampled due to 0.01' free product
Not sampled due to free product film (<0.01')
Not sampled due to 0.02' free product
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: 24I0126
Project: Holiday Oil #75
9/10/2024
Approved By:
Mark Broadhead, Project Manager
9632 South 500 West Sandy, Utah 84070
Serving the Intermountain West since 1953
801.262.7299 Main 866.792.0093 Fax www.ChemtechFord.com
Page 1 of 5
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
9/3/24 17:30 @ 3.9 °C
9/10/2024
Holiday Oil #75
Sample ID: MW-2
Lab ID: 24I0126-01Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 9/3/24 13:30
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 9/5/249/5/240.005 EPA 8260D/5030BNDBenzene
mg/L 9/5/249/5/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 9/5/249/5/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 9/5/249/5/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 9/5/249/5/240.012 EPA 8260D/5030BNDToluene
mg/L 9/5/249/5/240.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 9/5/249/5/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 9/4/249/4/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Holiday Oil #75 CtF WO#: 24I0126
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
9/3/24 17:30 @ 3.9 °C
9/10/2024
Holiday Oil #75
Sample ID: MW-3
Lab ID: 24I0126-02Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 9/3/24 13:50
Preparation
Date/Time
Sampled By: David Hansen
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 9/5/249/5/240.005 EPA 8260D/5030BNDBenzene
mg/L 9/5/249/5/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 9/5/249/5/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 9/5/249/5/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 9/5/249/5/240.012 EPA 8260D/5030BNDToluene
mg/L 9/5/249/5/240.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 9/5/249/5/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 9/4/249/4/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Holiday Oil #75 CtF WO#: 24I0126
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
Rockwell Solutions, Inc
Dave Hansen
718 East Bridger Lane
Elk Ridge, UT 84651
PO#:
Receipt:
Date Reported:
Project Name:
9/3/24 17:30 @ 3.9 °C
9/10/2024
Holiday Oil #75
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: Holiday Oil #75 CtF WO#: 24I0126
www.ChemtechFord.com
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