DERR-2025-003694

2410 WEST CALIFORNIA AVENUE • SALT LAKE CITY, UTAH 84104
PHONE [phone]
Website: www.wasatch-environmental.com • e-Mail: [e-mail]
Ms. Heather Frost, Ph.D.
Director of Environmental and Sustainability Programs
April 22, 2025
Project No.: 2731-002A
Signature Aviation
13485 Veterans Way, Suite 600
Orlando, Florida 32827
SUBJECT: Additional Soil Sampling Results Report
Signature Aviation Above Ground Storage Tank Overfill
Provo Utah Airport
3421 Mike Jense Parkway
Provo, Utah
Facility ID No.: 1000007, Release ID; OMF
Wasatch Environmental, Inc., (Wasatch) has completed collection and analysis of four additional soil
samples as requested by the Utah Division of Environmental Quality (DEQ). The analytical results were
all below the Utah Risked Based Corrective Action (RBCA) Screening Levels used by the DEQ to support
regulatory closure of a petroleum release at Signature Aviation’s fuel farm (Site), located at the Provo,
Utah airport. We anticipate that after review of these sample results, the Site will receive regulatory
closure.
BACKGROUND
On December 17, 2024, an overfill of Tank 2 occurred during fuel delivery resulting in a release of
approximately 300 to 400 gallons of Jet A fuel from the vent pipe and onto the tank and surrounding
graveled surface beneath the tank as well as spreading to areas beneath Tank 1, located to the south.
Signature Aviation contracted Wasatch Environmental, Inc., (Wasatch) to provide professional oversight
and direction of the cleanup activities, provide regulatory support with the Utah DEQ, collect and analyze
the required confirmation samples, and prepare a report to document that the release has been properly
remediated. The remediation completion report, dated February 12, 2025, was submitted to the DEQ and
during the Closure Committee meeting it was recommended that additional soil samples be collected at
three locations south and east of the remediation area to show that the petroleum impacts to soil have
been delineated.
METHODOLOGY
On April 3, 2025, Wasatch personnel advanced three borings using decontaminated hand augers at
locations HA-A, HA-B, and HA-C as shown on Figure 1. The hand auger borings were advanced to a
depth of approximately 3 feet below ground surface (bgs).
Mr. Christopher Nolan, Utah-certified underground storage tank (UST) Groundwater and Soil Sampler
(CS 1101) collected four soil samples from three locations in the areas requested by DEQ using hand
tools and transported them to an analytical laboratory for analysis.
The depths at which the soil samples were collected for laboratory analysis was determined in the field
based on previous sampling depths and on field observations of petroleum impacts such as, the zone of
greatest impacts, odor, and observations of staining. Previous soil samples identified the greatest
concentration of petroleum hydrocarbons from approximately 1.5 to 1.75 feet bgs.

Wasatch Environmental Inc.
Page 2
The soil samples were transferred into appropriate containers, labelled with sample identification, date,
time of collection and requested analysis, placed in iced coolers, and submitted under chain-of-custody to
Chemtech-Ford Laboratories, a Utah-certified laboratory. The four soil samples were analyzed for
benzene, toluene, ethylbenzene, total xylenes, and naphthalene (BTEXN) using United States
Environmental Protection Agency (U.S. EPA) Method 8260D and total petroleum hydrocarbons as diesel -
range organics (TPH-DRO) using U.S. EPA Method 8015 with silica gel treatment.

Following the completion of the soil sampling activities, the boring locations were backfilled with soil and
hydrated bentonite. The surface at HA-A and HA-B were repaired with an asphalt surface patch to match
the existing surface.

RESULTS

At HA-A, petroleum impacts were observed at 1.75 feet bgs, and a sample was collected from 1.75 to 2
feet bgs. A second soil sample was collected below this level from approximately 2.5 to 2.75 feet bgs to
evaluate the vertical profile of petroleum impacts. No observations of petroleum impacts were identified
in any of the soil collected at hand auger borings HA-B or HA-C.

Table 1 summarizes the analytical results from the hand auger soil samples. For comparison purposes,
the Utah Division of Environmental Response and Remediation Initial Screening Levels (ISLs) and Utah
RBCA Tier 1 Screening Levels are also presented on Table 1. Both soil samples collected at HA-A
identified TPH-DRO at concentrations greater than the Utah ISL but below the Utah RBCA Tier 1
Screening Level. All analytes reported in soil samples collected at HA-B and HA-C were below laboratory
minimum reporting limit.

CONCLUSIONS AND DISCUSSION

Based on the collection and analysis of additional soil samples from south and east of the AST
excavation area remediation, it appears that soil concentrations well below the Utah ISLs were identified
in HA-B and HA-C and that soil impacts identified in HA-A were below the Utah RBCA Tier 1 screening
level and decreased with depth. Based on these results and results of confirmation soil samples
collected from the extent of the soil remediation, Wasatch recommends that the release receive
regulatory closure.

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.

Sincerely,

WASATCH ENVIRONMENTAL, INC.

Christopher J. Nolan, P.G.
Project Geologist
Utah UST Certified Consultant CC 0118

FIGURE

Figure 1 – Sample Location Map

Wasatch Environmental Inc.
Page 3

TABLE

Table 1 – Soil Samples Analytical Results

APPENDIX

Appendix A – Laboratory Analytical Report

Figure

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FIGURE 1DATE:PROJECT NO.:Environmental Science and Engineering 2731-002A 4/18/25
Sample Location Map
Approximate Excavation Area of 2-3ft Below Ground Surface (bgs)
➤
N30ft
Sample Location (Depth)
Approximate Excavation Area of 8-10in bgs Down to Solid Asphalt
Signature Aviation
Provo Airport, Provo, UT
X
X
X
X
X
X
X
X
X
X X
N West 1 (0.5’)
N West 2 (0.5’)
S Wall 1 (1’)
S West 1 (2’)
S Floor Middle (1.5’)
N East (1’)
E Wall (1’)
S Wall 2 (1’)
S Wall 3 (1’)
S Floor East (2’)
*Excavation up to edge of AST Footing
Gate
AV GAS Pump/Filter Pad
Motor/Inventory Controls Shed
Jet Pump/Filter Pad
Tank 3
Tank 1
Tank 2
Vent
X X
X
Overex Floor (2.5’)
Overex Wall W (1.5’)
Overex Wall E (1.75’)
X
OX Floor (2’)
X
2 OX Wall W (1’)
X
2 OX Wall E (1.5’)
*Excavation up to edge of AST Footing
X
Overex Floor (2.75’)
HA-A HA-B
HA
-
C
Additional Sample Location

Table

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s
South Trench West SW 1 @ 2'2.0 12/19/2024 425 767 <0.20 0.22 4.47 8.96 8.72 90.4
S Wall 1 @ 1'1.0 12/21/2024 2,850 <0.296 <0.02 <0.01 <0.03 <0.03 <0.03 <0.09
S Wall 2 @ 1'1.0 12/21/2024 <65 <3.26 <0.20 <0.13 <0.33 <0.33 <0.33 <0.98
S Floor Middle @ 1.5'1.5 12/21/2024 817 <3.21 <0.19 <0.13 <0.32 <0.32 <0.32 <0.96
N West @0.5'0.5 12/21/2024 580 <0.229 <0.01 <0.009 <0.02 <0.02 <0.02 <0.07
N West 2 @0.5'0.5 12/21/2024 913 <0.201 <0.01 <0.008 <0.02 <0.02 <0.02 <0.06
North East Limit NE @ 1'1.0 12/21/2024 635 0.612 <0.02 <0.01 <0.03 <0.03 <0.03 <0.08
S Wall 3 @ 1'1.0 12/21/2024 14,000*420 <0.19 <0.12 2.31 5.33 <0.31 12.0
S Floor East @ 2'2.0 12/21/2024 <67 <0.291 <0.02 <0.01 <0.03 <0.03 <0.03 <0.09
South Trench East East Wall @ 1'1.0 12/21/2024 <68 10.4 <0.20 <0.14 <0.34 <0.34 <0.34 <1.02
Beneath Tank 1 Overex Floor @ 2.5'2.5 12/30/2024 2,020 202 <0.20 <0.13 0.48 2.30 <0.33 2.70
Overex Wall W @ 1.5'1.5 12/30/2024 8,050*848 <0.20 <0.13 4.29 7.59 <0.34 31.3
Overex Wall E @ 1.75 1.75 12/30/2024 27,900*1,320 <0.21 <0.14 9.21 14.3 4.00 81.2
Overex Floor 2 @ 2.75 2.75 12/30/2024 3,010 250 <0.19 <0.13 0.72 1.35 <0.32 3.35
South of Tank 1 2 OX Floor @ 2'2.0 1/6/2025 <66 1.39 <0.02 <0.01 <0.03 0.03 <0.03 <0.10
2 OX Wall W @ 1'1.0 1/6/2025 2,160 233 <0.20 <0.13 <0.33 2.30 <0.33 4.07
2 OX Wall E @ 1.5'1.5 1/6/2025 5,900 396 <0.19 <0.13 <0.32 2.45 <0.32 2.06
Northeast of tank farm Test Pit @ 2.5'2.5 1/6/2025 <59 <0.295 <0.02 <0.01 <0.03 <0.03 <0.03 <0.09
Hand Auger HA-A @ 2'2.0 4/3/2025 3,470 18.5 <0.008 <0.005 0.07 0.45 0.03 <0.04
Hand Auger HA-2 @ 2.75 2.75 4/3/2025 1,820 40.6 <0.008 <0.005 0.25 0.86 0.09 <0.04
Hand Auger HA-B @ 2'2.0 4/3/2025 <68 <0.0334 <0.002 <0.001 <0.003 <0.003 <0.003 <0.01
Hand Auger HA-C @ 1.75 1.75 4/3/2025 <68 <0.0336 <0.002 <0.001 <0.003 <0.003 <0.003 <0.01
500 150 0.3 0.2 5 51 9 142
5,000 1,500 0.3 0.9 23 51 25 142
NOTES:
< = concentration was below the laboratory reporting limit
BOLD = Concentration greater than Utah RBCA Tier 1 Screening Levels
* = Soil was overexcavated at these locations
Utah Risk-Based Corrective Action Tier 1 Screening Levels
Table 1
Soil Sample Analytical Results
Signature Aviation Provo, Utah Airport
Provo, Utah
all concentrations are expressed in milligrams per kilogram (mg/kg)
Utah Initial Screening Levels
Sample Location Sample I.D.Depth
(feet)
Sample
Collection
Date
Petroleum Hydrocarbons

Appendix A
Laboratory 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: Chris Nolan
2410 West California Avenue
Salt Lake City, UT 84104
Work Order: 25D0374
Project: Signature Aviation Provo
4/9/2025
Approved By:
Melissa Connolly, 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 7
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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
Chris Nolan
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2731-002
4/3/25 12:28 @ 7.9 °C
4/9/2025
Signature Aviation Provo
Sample ID: HA-B @ 2'
Lab ID: 25D0374-01Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/3/25 10:40
Preparation
Date/Time
Sampled By: Chris Nolan
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/kg dry 4/7/254/7/2568EPA 8015 CNDDiesel Range Organics
Inorganic
%4/3/254/3/250.1 CTF800074.0Total Solids
MBTEXn
mg/kg dry 4/4/254/4/250.001 EPA 8260D/5030ANDBenzene
mg/kg dry 4/4/254/4/250.003 EPA 8260D/5030ANDEthylbenzene
mg/kg dry 4/4/254/4/250.002 EPA 8260D/5030ANDMethyl-tert-butyl ether (MTBE)
mg/kg dry 4/4/254/4/250.003 EPA 8260D/5030ANDNaphthalene
mg/kg dry 4/4/254/4/250.003 EPA 8260D/5030ANDToluene
mg/kg dry 4/4/254/4/250.01 EPA 8260D/5030ANDXylenes, total
Gasoline Range
mg/kg dry 4/4/254/4/250.0334 EPA 8260B/C 5035A/[CALC]NDGasoline Range Organics
Project Name: Signature Aviation Provo CtF WO#: 25D0374
www.ChemtechFord.com
Page 2 of 7Page 2 of 7
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
Chris Nolan
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2731-002
4/3/25 12:28 @ 7.9 °C
4/9/2025
Signature Aviation Provo
Sample ID: HA-A @ 2'
Lab ID: 25D0374-02Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/3/25 11:15
Preparation
Date/Time
Sampled By: Chris Nolan
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/kg dry 4/7/254/7/2565EPA 8015 C3470Diesel Range Organics
Inorganic
%4/3/254/3/250.1 CTF800076.8Total Solids
MBTEXn
mg/kg dry 4/4/254/4/250.005 EPA 8260D/5030ANDBenzene
mg/kg dry 4/4/254/4/250.01 EPA 8260D/5030A0.07Ethylbenzene
mg/kg dry 4/4/254/4/250.008 EPA 8260D/5030ANDMethyl-tert-butyl ether (MTBE)
mg/kg dry 4/4/254/4/250.01 EPA 8260D/5030A0.45Naphthalene
mg/kg dry 4/4/254/4/250.01 EPA 8260D/5030A0.03Toluene
mg/kg dry 4/4/254/4/250.04 EPA 8260D/5030ANDXylenes, total
Gasoline Range
mg/kg dry 4/4/254/4/250.130 EPA 8260B/C 5035A/[CALC]18.5Gasoline Range Organics
Project Name: Signature Aviation Provo CtF WO#: 25D0374
www.ChemtechFord.com
Page 3 of 7Page 3 of 7
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
Chris Nolan
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2731-002
4/3/25 12:28 @ 7.9 °C
4/9/2025
Signature Aviation Provo
Sample ID: HA-A @ 2.75
Lab ID: 25D0374-03Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/3/25 11:20
Preparation
Date/Time
Sampled By: Chris Nolan
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/kg dry 4/7/254/7/2564EPA 8015 C1820Diesel Range Organics
Inorganic
%4/3/254/3/250.1 CTF800078.7Total Solids
MBTEXn
mg/kg dry 4/4/254/4/250.005 EPA 8260D/5030ANDBenzene
mg/kg dry 4/4/254/4/250.01 EPA 8260D/5030A0.25Ethylbenzene
mg/kg dry 4/4/254/4/250.008 EPA 8260D/5030ANDMethyl-tert-butyl ether (MTBE)
mg/kg dry 4/4/254/4/250.01 EPA 8260D/5030A0.86Naphthalene
mg/kg dry 4/4/254/4/250.01 EPA 8260D/5030A0.09Toluene
mg/kg dry 4/4/254/4/250.04 EPA 8260D/5030ANDXylenes, total
Gasoline Range
mg/kg dry 4/4/254/4/250.127 EPA 8260B/C 5035A/[CALC]40.6Gasoline Range Organics
Project Name: Signature Aviation Provo CtF WO#: 25D0374
www.ChemtechFord.com
Page 4 of 7Page 4 of 7
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
Chris Nolan
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2731-002
4/3/25 12:28 @ 7.9 °C
4/9/2025
Signature Aviation Provo
Sample ID: HA-C @ 1.75
Lab ID: 25D0374-04Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/3/25 11:40
Preparation
Date/Time
Sampled By: Chris Nolan
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/kg dry 4/7/254/7/2568EPA 8015 CNDDiesel Range Organics
Inorganic
%4/3/254/3/250.1 CTF800073.3Total Solids
MBTEXn
mg/kg dry 4/4/254/4/250.001 EPA 8260D/5030ANDBenzene
mg/kg dry 4/4/254/4/250.003 EPA 8260D/5030ANDEthylbenzene
mg/kg dry 4/4/254/4/250.002 EPA 8260D/5030ANDMethyl-tert-butyl ether (MTBE)
mg/kg dry 4/4/254/4/250.003 EPA 8260D/5030ANDNaphthalene
mg/kg dry 4/4/254/4/250.003 EPA 8260D/5030ANDToluene
mg/kg dry 4/4/254/4/250.01 EPA 8260D/5030ANDXylenes, total
Gasoline Range
mg/kg dry 4/4/254/4/250.0336 EPA 8260B/C 5035A/[CALC]NDGasoline Range Organics
Project Name: Signature Aviation Provo CtF WO#: 25D0374
www.ChemtechFord.com
Page 5 of 7Page 5 of 7
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
Chris Nolan
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2731-002
4/3/25 12:28 @ 7.9 °C
4/9/2025
Signature Aviation Provo
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: Signature Aviation Provo CtF WO#: 25D0374
www.ChemtechFord.com
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