DERR-2024-012396

Underwood Environmental Consulting, Inc.
9475 N. Silver Creek Road  Park City, Utah 84098  Phone [phone]  Fax [phone]

ADDITIONAL SUBSURFACE INVESTIGATION REPORT
RELEASE OCB

Submitted: October 28th, 2024

Killian’s Service
150 East Main Street
Duchesne, Utah
Facility ID #9000190, Release Site OCB

Submitted To:

Ms. Melissa Killian
Killian’s Service
P.O. Box 342
Duchesne, Utah 84021

Copy To:

Ms. Nicole Chavez
Department of Environmental Quality
Division of Environmental Response and Remediation
P.O. Box 144840
Salt Lake City, Utah 84114-4840

Additional Subsurface Investigation Report
Killian’s Duchesne
150 East Main St., Duchesne, UT
Facility ID #9000190, Release Site OCB

Underwood Environmental Consulting, Inc.
i
EXECUTIVE SUMMARY

Underwood Environmental Consulting, Inc. conducted a second subsurface investigation to define the
downgradient extents of soil and groundwater impacts from the former Killian’s Service facility. Two
off-site monitoring wells were installed during the investigation. Based on the sample results soil and
groundwater impacts downgradient of the project site have been reasonably defined.

This report summarizes the results of a subsurface investigation performed in September of 2024. The
following conclusions are presented:

• Two downgradient monitoring wells were installed on September 30, 2024.

• The native soil types encountered were typical of fluvial or stream deposits and were logged
primarily as clayey sands and gravel from 5 -15 feet below grade.

• Groundwater was gauged at approximately 4.19 to 5.14 feet below top-of-casing (TOC) in
the seven monitoring wells on and off site. The groundwater flow direction was determined
to be southeast across the study area.

• Soil and groundwater samples collected from the two new off-site well locations MW-6
and MW-7 were below the Initial Screening Levels (ISLs) for regulated petroleum
constituents.

• Groundwater samples were also collected from three on-site monitoring wells. One well
(MW-5) exceeded Tier 1 screening levels for benzene. Initial Screening Levels (ISLs) were
exceeded in two other wells (MW-3 and MW-4) for benzene and/or TPH/GRO and
TPH/DRO.

• No measurable free product was observed in any of the monitoring wells sampled.

Based on the findings presented above, UEC recommends moving forward with the formulation of a
corrective action plan. Discussions with Duchesne City officials suggests that use of the local landfill
for disposal of impacted soil and use of the sewer treatment plant for discharge of treated groundwater
would be permitted. Continued groundwater monitoring of MW-3 through MW-7 is recommended.

Respectfully,
Underwood Environmental Consulting, Inc.

L. Earl Underwood, P.G.
Project Geologist
UST Certified Consultant - CC0018
Additional Subsurface Investigation Report
Killian’s Duchesne
150 East Main St., Duchesne, UT
Facility ID #9000190, Release Site OCB

Underwood Environmental Consulting, Inc.
ii
TABLE OF CONTENTS

1.0 INTRODUCTION
2.0 SITE DESCRIPTION
3.0 METHODOLOGY- OFF SITE WELL INSTALLATION
3.1 SOIL SAMPLING
3.2 GROUNDWATER SAMPLING
4.0 RESULTS
4.1 SUBSURFACE LITHOLOGY
4.2 FIELD SCREENING
4.3 SOIL ANALYTICAL RESULTS
4.4 GROUNDWATER FLOW DIRECTION
4.5 GROUNDWATER ANALYTICAL RESULTS
4.6 FREE PRODUCT
5.0 QUALITY ASSURANCE AND QUALITY CONTROL
6.0 CONCLUSIONS AND RECOMMENDATIONS
7.0 LIMITATIONS

References Cited
APPENDICES

Appendix A Subsurface Logs
Appendix B Laboratory Analytical Reports and Chain of Custody Documentation
Appendix C Photo Documentation

LIST OF FIGURES

Figure 1 Site Vicinity Map
Figure 2 Groundwater Gradient Map (October 1, 2024)

LIST OF TABLES

Table 1 Soil Sample Analytical Results
Table 2 Groundwater Monitoring Data
Additional Subsurface Investigation Report
Killian’s Duchesne
150 East Main St., Duchesne, UT
Facility ID #9000190, Release Site OCB

Underwood Environmental Consulting, Inc.
1

1.0 INTRODUCTION

Underwood Environmental Consulting, Inc. (UEC) conducted an initial subsurface investigation for
Killian’s Service in Duchesne, Utah in May of 2022. Five monitoring wells (MW-1 through MW-5)
were installed at that time. Groundwater monitoring was performed through 2023. In order to define
the downgradient impacts an additional off-site subsurface investigation was performed in 2024.

The project site, a former retail fueling station, located at 150 East Main Street, Duchesne, Utah, includes
an office and an auto repair shop. The underground storage tank (UST) fueling system was removed in
September of 2021. Soil and groundwater samples obtained during the UST removal exceeded action
levels established by the by Utah Division of Environmental Response and Remediation (DERR). The
site is eligible for Petroleum Storage Tank (PST) Fund reimbursement. The DERR identifies the project
site as Facility ID #9000190, Release Site OCB. This report summarizes the results of a subsurface
investigation performed on September 30, 2024 under approved work plan OCB-03.

2.0 SITE DESCRIPTION

The project site is located on the south side of Main Street (Hwy 40) in the town of Duchesne between
the Duchesne River to the north and the Strawberry River to the south. Commercial businesses are
located across Main Street to the north, across 200 East Street to the east and adjacent the site to the
west. Residential homes are located across the alley to the south (Figure 1). The site includes an auto
repair shop and an attached office. The former retail gas station was closed by removal in 2021.
Groundcover consists of asphalt pavement, concrete, gravel, and landscaping. Utilities border the site
to the north in Main Street, to the east in 200 East Street and to the south in the adjacent alley (Figure
1). The project site is essentially flat and slopes gently to the east and is at an elevation of approximately
5,500 feet above mean sea level.

3.0 OFFSITE MONITORING WELL INSTALLATION - METHODOLOGY

Two off-site soil borings were drilled and completed as monitoring wells on September 30, 2024. A
portable track mounted combination direct push /ODEX drilling rig was used to obtain soil samples and
install the monitoring wells. The ODEX drilling method was considered necessary due to the dense
cobbles encountered in the previous on-site drilling. Due to the close proximity of underground utilities
(sewer main and laterals, water main and laterals, fiber optics and buried power) in the targeted drilling
locations, a ground penetrating radar and other utility locating equipment were used prior to drilling.
Additionally, both soil borings were cleared by hydro-vacuum equipment (daylighting) to approximately
five feet below grade.

Additional Subsurface Investigation Report
Killian’s Duchesne
150 East Main St., Duchesne, UT
Facility ID #9000190, Release Site OCB

Underwood Environmental Consulting, Inc.
2
The drilling locations for MW-6 and MW-7 were based on the established groundwater flow direction
(southeast) from previous monitoring of on-site wells MW-1 through MW-5. Utility inquiries were
made and select off-site property owners were contacted for potential access to drilling. Ultimately both
off-site wells were installed on city owned property or right of way. Direct Push Services, Inc. performed
the utility locate, daylighting and drilling services. MW-6 and MW-7 were placed downgradient of on-
site wells MW-3 and MW-5, which had the highest impacts based on historical monitoring. The
monitoring well construction details are depicted on the subsurface logs provided in Appendix A. The
wells were developed immediately after installation using sure and purge techniques. The wells were
developed until the water was relatively clear and free of fines. The top of casing (TOC) for the two new
wells was surveyed and tied in the relative TOC elevations of the existing on-site wells. A laser survey
instrument was utilized for the survey.

3.1 SOIL SAMPLING

Soil samples were collected in a continuous fashion from approximately 5 feet to the total depth of each
hole (~15 feet). Soils from the upper five feet were removed during daylighting and not logged. Multiple
soil samples were collected from each boring and retained in laboratory-supplied glass jars, labeled
appropriately, and placed on ice. The soil samples were analyzed by Chemtech-Ford Laboratories for
methyl tertiary-butyl ether (MTBE), benzene, toluene, ethylbenzene, xylenes, naphthalene (BTEXN),
total petroleum hydrocarbons – gasoline range organics (TPH-GRO), and TPH – diesel range organics
(TPH-DRO) using EPA methods 8260B and 8015C. Chain of custody documentation was maintained
for all samples from the time of collection until delivered to the laboratory.

Field screening of soil sample intervals was conducted by headspace analysis using a photo-ionization
detector (PID). The samples were field screened using a Mini RAE 3000 PID. The exploratory borings
were logged in the field by a UEC professional geologist using the unified soil classification (USC)
system.

3.2 GROUNDWATER SAMPLING

On October 1, 2024 water levels were measured from all seven monitoring wells (MW-1 through MW-
7) using an electronic water level indicator. The wells were subsequently purged of three casing volumes
of water prior to sampling. A separate disposable bailer was utilized for sample collection at each well.
The groundwater samples were labeled appropriately, placed on ice, and submitted to the laboratory
under chain-of-custody. The groundwater samples were analyzed for MTBE, BTEXN, TPH-GRO, and
TPH-DRO using EPA methods 8260B and 8015C.

Additional Subsurface Investigation Report
Killian’s Duchesne
150 East Main St., Duchesne, UT
Facility ID #9000190, Release Site OCB

Underwood Environmental Consulting, Inc.
3

4.0 RESULTS

Details concerning subsurface lithology and project background information are presented in the initial
Subsurface Investigation Report submitted August 15, 2022.

4.1 SUBSURFACE LITHOLOGY

The primary native soil types observed below five feet in MW-6 and MW-7 included clayey sand and
gravel with some sandy clay. Coarse gravel was apparent but was not as pervasive as observed in the
on-site wells and borings. Several on-site borings encountered an apparent cobble / coarse gravel layer
around 7-8 feet. The water table was measured at 4 to 5 feet below grade, consistent with on-site wells.
Subsurface lithology was consistent with fluvial or stream deposits as expected given the proximity of
the Duchesne and Strawberry Rivers. The subsurface logs are provided as an attachment in Appendix A.

4.2 FIELD SCREENING

Field screening of soil was conducted at variable intervals at each boring location using a PID. The
results of field screening are presented on the subsurface logs attached in Appendix A. The field
screening generally suggested a lack of significant hydrocarbon impacts to soil in MW-6 and MW-7.
The highest PID reading was below 1 ppm.

4.3 SOIL ANALYTICAL RESULTS

Three soil samples were submitted for laboratory analysis from each exploratory boring. The results of
soil sample analysis from this subsurface investigation are presented on Table 1. The analytical results
presented on Table 1 are compared with Initial Screening Levels (ISLs) and Tier 1 Screening Criteria
(Tier 1 levels) (DERR, 2005).

Of the six soil samples analyzed, one sample (MW-6 @ 6-7 ft) contained detectable concentrations of
benzene and MTBE well below ISLs. The remaining samples were below lab detection limits. The
extent of petroleum hydrocarbon impacts in soil downgradient (southeast) of MW-3 and MW-5 are
therefore defined. The laboratory analytical reports and chain-of-custody documentation are provided in
Appendix B.

4.4 GROUNDWATER FLOW DIRECTION

On October 1, 2024 the depth to groundwater ranged from approximately 4.19 to 5.14 feet below top-
of-casing (TOC) in the seven monitoring wells (Table 2). Figure 2 depicts a groundwater contour map
Additional Subsurface Investigation Report
Killian’s Duchesne
150 East Main St., Duchesne, UT
Facility ID #9000190, Release Site OCB

Underwood Environmental Consulting, Inc.
4
for the project site on October 1, 2024. Based on the calculated groundwater elevations, the groundwater
flow direction is to the southeast and is generally consistent with previous data.

4.5 GROUNDWATER ANALYTICAL RESULTS

Five monitoring wells were purged and sampled on October 1, 2024. A summary of groundwater
monitoring data is presented on Table 2. The analytical results presented on Table 2 are compared with
ISLs and Tier 1 levels (DERR, 2005). MW-6 contained 0.010 mg/L MTBE which is below the ISL of
0.300 mg/L. All other constituents were below laboratory detection limits in off-site wells MW-6 and
MW-7. The extent of petroleum hydrocarbon impacts in groundwater appear to be defined to ISL
concentrations in downgradient wells MW- 6 and MW-7. The laboratory analytical reports and chain-
of-custody documentation are provided in the Appendix B.

4.6 FREE PRODUCT

No free product was observed while purging or sampling monitoring wells.

5.0 QUALITY ASSURANCE AND QUALITY CONTROL

Soil and groundwater samples collected during subsurface investigation were collected by a State-
certified soil and groundwater sampler under the supervision of a State-certified UST Consultant. Proper
sampling protocol, utilizing industry recognized standards, was followed during the investigation.
Samples were retained in laboratory-supplied containers (4 oz. glass jars or 40 ml vials) and placed on
ice until relinquished to the laboratory. Chain of custody records were maintained and are attached along
with the complete laboratory analytical reports in Appendix C. The analytical laboratory utilized is
certified by the State for the analyses performed and has quality assurance / quality control procedures
in place to ensure the accuracy of the analytical data provided.

6.0 CONCLUSIONS AND RECOMMENDATIONS

Based on field observations and the analytical results of soil and groundwater samples obtained during
subsurface investigation, the following conclusions are presented:

• Two downgradient monitoring wells (MW-6 and MW-7) were installed on September 30,
2024.

• The native soil types encountered were typical of fluvial or stream deposits and were logged
primarily as clayey sands and gravel from 5 -15 feet below grade.
Additional Subsurface Investigation Report
Killian’s Duchesne
150 East Main St., Duchesne, UT
Facility ID #9000190, Release Site OCB

Underwood Environmental Consulting, Inc.
5

• Groundwater was gauged at approximately 4.19 to 5.14 feet below top-of-casing (TOC) in
the seven monitoring wells on and off site. The groundwater flow direction was determined
to be southeast across the study area.

• Soil and groundwater samples collected from the two new off-site well locations MW-6
and MW-7 were below the Initial Screening Levels (ISLs) or non-detectable for regulated
petroleum constituents.

• Groundwater samples were also collected from three on-site monitoring wells. One well
(MW-5) exceeded Tier 1 screening levels for benzene. Initial Screening Levels (ISLs) were
exceeded in two other wells (MW-3 and MW-4) for benzene and/or TPH/GRO and
TPH/DRO.

• Soil and groundwater impacts appear to be defined downgradient of on-site monitoring
wells MW-5 and MW-3.

• No measurable free product was observed in any of the monitoring wells sampled.

Based on the findings presented above, UEC recommends moving forward with the formulation of a
corrective action plan. Discussions with Duchesne City officials suggests that use of the local landfill
for disposal of impacted soil and use of the sewer treatment plant for discharge of treated groundwater
would be permitted. Continued groundwater monitoring of MW-3 through MW-7 is recommended.

7.0 LIMITATIONS

Our services consist of professional opinions from a State-Certified UST Consultant, made in general
accordance with locally accepted environmental practices at the time of execution. Environmental
samples are obtained from specific locations, utilizing methodologies consistent with the Utah
Department of Environmental Quality regulations. Even when field investigative work is performed to
an appropriate standard of care, certain site conditions may present difficult assessment problems. Such
conditions may include, but are not limited to, complex geologic setting and materials, fate and transport
character of petroleum hydrocarbons, physical constraints, presence of utilities overhead and below
ground, and the limitations of the assessment tools employed. UEC makes no guarantee; either
expressed or implied, that the analytical results accurately represent subsurface conditions throughout
the entire project site.

Additional Subsurface Investigation Report
Killian’s Duchesne
150 East Main St., Duchesne, UT
Facility ID #9000190, Release Site OCB

Underwood Environmental Consulting, Inc.
6

REFERENCES CITED:

Bristol, 2018 2018 Annual Groundwater Monitoring Report, Potter Family Trust LUST
Site, Facility ID# 9000242, Duchesne, Utah: Bristol Environmental
Remediation Services, L.L.C., November 1, 2018

Underwood, 2021 Underground Storage Tank Permanent Closure Notice, Facility ID# 9000190,
Killian’s Service, Duchesne, Utah: Underwood Environmental Consulting,
Inc., October 18, 2021.

DERR, 2005 Utah LUST Program Screening Levels for Soil and Groundwater: Utah
Division of Environmental Response and Remediation, Salt Lake City, Utah,
November 1, 2005.

Underwood, 2022 Subsurface Investigation Report, Killian’s Service, Release OCB, Facility
ID# 9000190, Duchesne, Utah: Underwood Environmental Consulting, Inc.,
August 15, 2022.

SSSSSSSSSSSSSSSS S S S
S
S S
S
S
S
P
P
P
W
W
WWWWWWWWWWWWWWWWWWWWWWWWW
F
F
F
?
F F F F FF F F F F F F F F F F F F F F F F F F
Falleyalley
G G G G G G G G G G G G G G
G
G
G
G
G
?
?
?
?
??
G
SD SD SD SD SD
P
s
s
sW
W
S1 S2
S3 S4
S5
S6
WS-1
Former UST Basin
Former
Dispenser
Islands
SHOP
OFFICE
WS-2
S7
as
p
h
a
l
t
gr
a
v
e
l
s s
s s
MW-1
MW-2
MW-3
MW-4
MW-5
B2
B3
B4
B5
B6
B7
B1
MAIN STREET (US 40)
20
0

E
A
S
T
S
T
R
E
E
T
MW-6
MW-7
fe
n
c
e
fe
n
c
e
fe
n
c
e
SITE
RESIDENTIAL RESIDENTIAL
COMMERCIAL
Natural GasG
Water LineW
(Utility Locations Approximate)
P Buried Power
P Overhead Power
SD Storm Drain
Fiber Optic LineF
S Sanitary Sewer
NORTH
SITE VICINITY
MAP
Killian’s Service
150 East Main St.
Duchesne, Utah
Facility ID #9000190
Release OCB
Work Plan OCB-03 FIGURE 1approx. scale in feet
0 4020
LEGEND
2” Monitoring Well
Soil Boring
s
W
UST Closure Samples
(September 2021)
SoilSoil
Water <
SSSSSSSSSSSSSSSS S S S
S
S S
S
S
S
P
P
P
W
W
WWWWWWWWWWWWWWWWWWWWWWWWW
F
F
F
?
F F F F FF F F F F F F F F F F F F F F F F F F
Falleyalley
G G G G G G G G G G G G G G
G
G
G
G
G
?
?
?
?
??
G
SD SD SD SD SD
P
s
s
sW
W
S1 S2
S3 S4
S5
S6
WS-1
Former UST Basin
Former
Dispenser
Islands
SHOP
OFFICE
WS-2
S7
as
p
h
a
l
t
s s
s s
MW-1
MW-2
MW-3
MW-4
MW-5
B2
B3
B4
B5
B6
B7
B1
MAIN STREET (US 40)
20
0

E
A
S
T
S
T
R
E
E
T
MW-6
MW-7
fe
n
c
e
fe
n
c
e
fe
n
c
e
SITE
RESIDENTIAL RESIDENTIAL
COMMERCIAL
Natural GasG
Water LineW
(Utility Locations Approximate)
P Buried Power
P Overhead Power
SD Storm Drain
Fiber Optic LineF
S Sanitary Sewer
NORTHGROUNDWATER GRADIENT
MAP (Oct 1, 2024)
Killian’s Service
150 East Main St.
Duchesne, Utah
Facility ID #9000190
Release OCB
Work Plan OCB-03 FIGURE 2
94.
0
Groundwater
Contour with
Flow Direction
approx. scale in feet
0 4020
LEGEND
2” Monitoring Well
Soil Boring
s
W
UST Closure Samples
(September 2021)
SoilSoil
Water <
9 3 .4
9 3.9
94.4
94.9
Relative GW Elevations
Posted in Feet
95.14 94.33
93.78
93.73
94.31
93.34
92.92
Subsurface Investigation Report
Killians Service
150 East Main St., Duchesne, Utah
Facility ID #9000190, Release Site OCB
Date Ethyl-Total Naphtha-TPH TPH
Sample Number Collected MTBE Benzene Toluene benzene Xylenes lene GRO DRO
(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)
Closure Samples collected during UST Removal - September 2021
S1 @ 4 ft 9/24/2021 <0.00588 <0.00294 <0.00588 <0.00588 <0.00588 <0.00588 <0.588 <23.6
S2 @ 4 ft 9/24/2021 <1.12 2.61 2.67 16.5 169 23.9 1510 3,430
S3 @ 4 ft 9/24/2021 <0.00617 <0.00308 <0.00617 <0.00617 <0.00617 <0.00617 <0.0617 <24.1
S4 @ 4 ft 9/24/2021 <0.115 3.95 5.3 73.8 934 48.5 3000 4160
S5 @ 4 ft 9/24/2021 <0.126 6.74 65.4 73.3 539 38.4 2420 2810
S6 @ 12 ft 9/24/2021 <1.19 8.98 133 40.1 265 8.41 2550 1,210
S7 @ 12 ft 9/24/2021 <0.126 1.3 3.92 6.14 35.6 3.3 538 594
Subsurface Investigation - May 2022
B1 @ 4-5'5/18/2022 <.011 <0.11 <0.27 2.22 <0.27 3.31 187 1130
B1 @ 8-9'5/18/2022 0.047 <0.010 <0.024 <0.024 <0.024 <0.024 <0.243 <57
B1 @ 12-13'5/18/2022 0.055 <0.009 <0.023 <0.023 <0.023 0.037 1.65 <56
B2 @ 4-5'5/18/2022 0.04 0.12 0.04 0.20 1.31 0.56 7.83 <62
B2 @ 8-9'5/18/2022 0.03 <0.01 <0.03 <0.03 <0.03 0.07 2.98 <55
B2 @ 12-13'5/18/2022 0.03 <0.01 <0.03 <0.03 <0.03 <0.03 <0.251 <56
B3 @ 4-5'5/18/2022 <0.12 1.50 7.43 4.65 34.0 3.49 296 5,400
B3 @ 7-8'5/18/2022 <0.12 0.22 1.93 2.28 15.6 1.97 170 128
B3 @ 12-13'5/18/2022 <0.11 <0.11 <0.29 <0.29 <0.29 <0.29 <2.86 <57
B4 @ 4-5'5/18/2022 0.06 0.02 <0.03 0.08 0.36 0.21 1.75 <59
B4 @ 7-8'5/18/2022 0.07 <0.01 <0.03 <0.03 0.06 0.10 <0.266 <61
B4 @ 11-12'5/18/2022 <0.01 <0.01 <0.03 <0.03 <0.03 <0.03 <0.252 <53
B5 @ 5-6'5/18/2022 <0.12 <0.12 <0.31 1.02 1.30 5.89 69.0 3,200
B5 @ 9-10'5/18/2022 <0.11 <0.11 <0.28 <0.28 <0.28 1.01 15.2 168
B5 @ 13-14'5/18/2022 0.03 <0.01 <0.03 <0.03 <0.03 <0.03 <0.263 <55
0.3 0.2 9 5 142 51 150 500
0.3 0.9 25 23 142 51 1,500 5,000
TABLE 1
SOIL SAMPLE ANALYTICAL RESULTS
Tier 1 Screening Criteria (1)
Initial Screening Level (1)
Underwood Environmental Consulting, Inc.
Subsurface Investigation Report
Killians Service
150 East Main St., Duchesne, Utah
Facility ID #9000190, Release Site OCB
Date Ethyl-Total Naphtha-TPH TPH
Sample Number Collected MTBE Benzene Toluene benzene Xylenes lene GRO DRO
(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)
TABLE 1
SOIL SAMPLE ANALYTICAL RESULTS
B6 @ 5-6'5/18/2022 0.05 <0.01 <0.03 <0.03 <0.03 <0.03 <0.276 107
B6 @ 11-12'5/18/2022 0.03 <0.01 <0.03 <0.03 <0.03 <0.03 <0.260 <54
B7 @ 4-5'5/19/2022 <0.010 <0.010 <0.024 <0.024 <0.024 <0.024 <0.238 <56
B7 @ 7-8'5/19/2022 <0.12 <0.12 6.20 11.8 228 6.24 794 1020
B7 @ 9-10'5/19/2022 0.032 <0.009 <0.022 <0.022 <0.022 <0.022 3.26 <56
B7 @ 12-13'5/19/2022 0.044 <0.009 <0.024 <0.024 <0.024 <0.024 <0.236 <54
MW-1 @ 4-5'5/19/2022 0.061 <0.009 <0.023 <0.023 <0.023 <0.023 <0.225 <60
MW-1 @ 9-10'5/19/2022 0.021 <0.010 <0.024 <0.024 <0.024 <0.024 <0.243 <55
MW-1 @ 12-13'5/19/2022 0.023 <0.010 <0.024 <0.024 <0.024 <0.024 <0.238 <58
MW-2 @ 7-8'5/19/2022 0.028 <0.009 <0.022 <0.022 <0.022 <0.022 <0.221 <55
MW-2 @ 8.5-9.5'5/19/2022 0.02 <0.009 <0.02 <0.02 <0.02 <0.02 <0.219 <55
MW-3 @ 6-7'5/19/2022 0.16 0.69 0.51 14.7 70.4 12.2 1130 801
MW-3 @ 9-10'5/19/2022 <0.01 <0.01 <0.03 <0.03 <0.03 <0.03 <0.264 <57
MW-4 @ 5-6'5/19/2022 0.01 <0.01 <0.03 <0.03 0.03 0.03 1.28 <58
MW-4 @ 7-8'5/19/2022 <0.12 0.20 9.53 31.6 222 26.2 2160 1270
MW-4 @ 9-10'5/19/2022 <0.01 <0.01 <0.03 <0.03 <0.03 <0.03 <0.284 <57
MW-5 @ 4-5'5/19/2022 0.57 3.92 1.97 20.2 124 16.3 1210 718
MW-5 @ 7-8'5/19/2022 <0.01 <0.01 <0.03 <0.03 <0.03 <0.03 3.42 <56
Subsurface Investigation - September 2024
MW-6 @ 6-7'9/30/2024 0.06 0.02 <0.03 <0.03 <0.08 0.04 <0.281 <63
MW-6 @ 9-10'9/30/2024 <0.02 <0.01 <0.03 <0.03 <0.08 <0.03 <0.294 <59
MW-6 @ 12.5-13.5'9/30/2024 <0.02 <0.01 <0.03 <0.03 <0.01 <0.03 <0.323 <83
MW-7 @ 5.5-6'9/30/2024 <0.02 <0.01 <0.03 <0.03 <0.08 <0.03 <0.283 <61
MW-7 @ 9-10'9/30/2024 <0.02 <0.01 <0.03 <0.03 <0.09 <0.03 <0.306 <62
MW-7 @ 13-14'9/30/2024 <0.02 <0.01 <0.03 <0.03 <0.08 <0.03 <0.254 <57
0.3 0.2 9 5 142 51 150 500
0.3 0.9 25 23 142 51 1,500 5,000Tier 1 Screening Criteria (1)
Initial Screening Level (1)
Underwood Environmental Consulting, Inc.
Groundwater Monitoring Data - Oct 2024
Killians Service
150 East Main St., Duchesne, Utah
Facility ID 9000190, Release Site OCB
WELL/DATE DTW FPT
GW
Elev.MTBE Benzene Toluene
Ethyl-
benzene Xylenes
Naphth-
alene
TPH
(GRO)
TPH
(DRO)
ELEV.(feet)(feet)(feet)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)
MW-1 05/28/22 4.96 95.04 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
100.00 11/08/22 5.33 94.67 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
03/29/23 4.18 95.82 <0.005 <0.005 <0.012 <0.012 <0.012 0.014 <0.125 <1.0
06/07/23 4.35 95.65 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
09/12/23 4.48 95.52 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
10/01/24 4.86 95.14
MW-2 05/28/22 4.48 94.25 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
98.73 11/08/22 4.79 93.94 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
03/29/23 3.80 94.93 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
06/07/23 3.87 94.86 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 0.137 <1.0
09/12/23 3.99 94.74 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0
10/01/24 4.40 94.33
MW-3 05/28/22 4.89 93.76 0.071 0.187 0.020 0.226 0.832 0.115 6.65 2.0
98.65 11/08/22 5.28 93.37 0.146 0.318 0.014 0.483 1.99 0.553 17.3 27.1
03/29/23 4.14 94.51 0.118 1.47 0.124 1.11 4.98 0.689 21.5 8.4
06/07/23 4.15 94.50 <0.005 0.616 0.043 0.554 2.40 0.346 19.0 <1.0
09/12/23 4.47 94.18 <0.005 0.782 0.030 0.633 3.17 0.487 17.7 10.2
10/01/24 4.87 93.78 <0.008 0.152 <0.012 0.167 0.684 0.180 8.65 3.6
MW-4 05/28/22 5.08 93.64 <0.005 0.013 0.142 0.189 1.24 0.072 6.16 2.2
98.72 11/08/22 5.34 93.38 <0.005 <0.005 <0.012 <0.012 0.080 0.017 1.72 1.2
03/29/23 4.34 94.38 <0.005 0.012 0.030 0.036 0.303 0.104 2.25 1.3
06/07/23 4.31 94.41 0.016 0.025 <0.012 0.015 0.052 <0.012 1.35 <1.0
09/12/23 4.69 94.03 <0.005 0.026 0.086 0.103 0.496 0.071 3.00 1.8
10/01/24 4.99 93.73 <0.008 <0.005 0.012 0.038 0.216 0.023 2.36 1.2
Initial Screening Levels (1)0.2 0.005 1 0.7 10 0.7 1 1
Tier 1 Screening Criteria (1)0.2 0.3 3 4 10 0.7 10 10
TABLE 2
GROUNDWATER MONITORING DATA
Not Sampled
Not Sampled
Underwood Environmental Consulting, Inc.
Groundwater Monitoring Data - Oct 2024
Killians Service
150 East Main St., Duchesne, Utah
Facility ID 9000190, Release Site OCB
WELL/DATE DTW FPT
GW
Elev.MTBE Benzene Toluene
Ethyl-
benzene Xylenes
Naphth-
alene
TPH
(GRO)
TPH
(DRO)
ELEV.(feet)(feet)(feet)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)
TABLE 2
GROUNDWATER MONITORING DATA
MW-5 05/28/22 4.27 94.23 0.050 0.856 0.043 0.517 4.73 0.323 14.2 4.2
98.50 11/08/22 4.60 93.90 0.155 1.31 0.018 0.237 1.14 0.126 6.36 2.1
03/29/23 3.48 95.02 0.865 4.71 <0.250 1.05 6.02 0.35 29.9 7.6
06/07/23 3.51 94.99 <0.005 2.25 0.037 0.515 2.82 0.295 28.1 11.9
09/12/23 3.80 94.70 <0.005 0.894 0.016 0.207 1.03 0.120 7.78 4.3
10/01/24 4.19 94.31 <0.008 0.870 0.014 0.204 0.946 0.114 6.77 1.4
MW-6 10/01/24 4.83 93.34 0.040 <0.005 <0.012 <0.012 <0.038 <0.012 <0.125 <1.0
98.17
MW-7 10/01/24 5.14 92.92 0.010 <0.005 <0.012 <0.012 <0.038 <0.012 <0.125 <1.0
98.06
Initial Screening Levels (1)0.2 0.005 1 0.7 10 0.7 1 1
Tier 1 Screening Criteria (1)0.2 0.3 3 4 10 0.7 10 10
(1) DERR, 2005 Bold values are above Initial Screening Levels. Highlighted,above Tier 1
Notes:Arbitrary datum of 100.00 feet established on site.MTBE = Methyl Tertiary Butyl Ether
DTW = Depth to Water TPH (GRO) = Total Petroleum Hydrocarbons - Gasoline Range Organics
FPT = Free Product Thickness TPH (DRO) = Total Petroleum Hydrocarbons - Diesel Range Organics
GW Elev. = Groundwater Elevation < Indicates below given detection limit.
Underwood Environmental Consulting, Inc.

APPENDIX A

SUBSURFACE LOGS

HOLE NO.
DRILLING METHOD ____________________________________________ SAMPLER TYPE _____________________________________________________
DRILLER / COMPANY ___________________________________________ TOTAL DEPTH ____________ WATER DEPTH _______
BORING DIAMETER _________ CASING DIAMETER _________ CASING MATERIAL ____________ SLOT SIZE __________
SURFACE ELEV. ____________ TOP OF CASING ELEV. ___________ LOGGED BY _____________________________________________
DATE ___________________
TIME STARTED _________
WEATHER ______________
SHEET _____ OF _______
PROJECT ________________________________
OWNER ________________________________
LOCATION _______________________________
DE
P
T
H

(

F
T
.)
SA
M
P
L
E
S
SA
M
P
L
E

IN
T
E
R
VAL
(f
e
e
t
)
DESCRIPTION / SOIL CLASSIFICATION
DE
P
T
H
00
02
04
06
08
10
14
16
12
00
02
04
06
08
10
12
14
16
SUBSURFACE
LOG
Graphic Log /
Well Const.
PID
Readings
(relative to
100 ppm
isobutylene)
UNIFIED
SOIL
CLASS.
SYSTEM
vault
box
concrete
be
n
t
o
n
i
t
e

s
e
a
l
2"
d
i
a
m
e
t
e
r
P
V
C
silica
sand
10/20
Prepack
Well
Screen set
at 3-13’
LEU
MW-6
EOB @ 15 ft
9-30-24
10:30
15 ft
OCB-03
150 E Main, Duchesne, UT
KILLIANS SERVICE
6-7 ft
0.2
0.3
0.0
0.0
0.0
PVC 4.5"
~5 ft
2"0.010"
98.17 ft~5500 ft
Direct Push / ODEX combo
Conner / Direct Push Services, Inc
9-10 ft
12.5-
13.5 ft
Water level in completed well.
Geoprobe Dual Tube -5 ft x 1.5-in liners
SC
SC
GC
Daylight to 5 ft
Gravel
moist to wet sandy CLAY, brown-gray, very slight odor
grades to wet clayey brown SAND, trace gravel, slight odor
0.0
CL
CL contact wet sandy CLAY , brown, roots, no odors
grades to sandy GRAVEL
becomes wet dark brown clayey SAND, trace gravel, roots, no odors
HOLE NO.
DRILLING METHOD ____________________________________________ SAMPLER TYPE _____________________________________________________
DRILLER / COMPANY ___________________________________________ TOTAL DEPTH ____________ WATER DEPTH _______
BORING DIAMETER _________ CASING DIAMETER _________ CASING MATERIAL ____________ SLOT SIZE __________
SURFACE ELEV. ____________ TOP OF CASING ELEV. ___________ LOGGED BY _____________________________________________
DATE ___________________
TIME STARTED _________
WEATHER ______________
SHEET _____ OF _______
PROJECT ________________________________
OWNER ________________________________
LOCATION _______________________________
DE
P
T
H

(

F
T
.)
SA
M
P
L
E
S
SA
M
P
L
E

IN
T
E
R
VAL
(f
e
e
t
)
DESCRIPTION / SOIL CLASSIFICATION
DE
P
T
H
00
02
04
06
08
10
14
16
12
00
02
04
06
08
10
12
14
16
SUBSURFACE
LOG
Graphic Log /
Well Const.
PID
Readings
(relative to
100 ppm
isobutylene)
UNIFIED
SOIL
CLASS.
SYSTEM
vault
box
concrete
be
n
t
o
n
i
t
e

s
e
a
l
2"
d
i
a
m
e
t
e
r
P
V
C
silica
sand
10/20
LEU
MW-7
EOB @ 15 ft
9-30-24
09:00
15’
OCB-03
150 E Main, Duchesne, UT
KILLIANS SERVICE
Gravel
5.5 -
6 ft 0.0
0.0
0.0
0.0
PVC 4.5"
~5 ft
2"0.010"
98.06 ft~5500 ft
Direct Push / ODEX combo
Conner / Direct Push Services, Inc
9-10 ft
Water level in completed well.
GC
Daylight to 5.5 ft
coarse-med wet clayey SAND, orange - brown, no odors
13-14 ft
becomes clayey med. SAND and GRAVEL, wet, brown, no odors
SC
Prepack
Well Screen
set at
3.5-13.5 ft
Geoprobe Dual Tube -5 ft x 1.5-in liners

APPENDIX B

LABORATORY ANALYTICAL REPORTS
AND
CHAIN OF CUSTODY DOCUMENTATION

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
Underwood Environmental Consulting
Attn: Earl Underwood
9475 North Silver Creek Road
Park City, UT 84098
Work Order: 24J0221
Project: Killians - Duchesne
10/9/2024
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 9
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
Underwood Environmental Consulting
Earl Underwood
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OCB-03
10/2/24 12:32 @ 2.3 °C
10/9/2024
Killians - Duchesne
Sample ID: WW-6 @ 6-7 ft
Lab ID: 24J0221-01Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 9/30/24 10:45
Preparation
Date/Time
Sampled By: Earl Underwood
Minimum
Reporting
Limit MethodResult
Inorganic
%10/3/2410/3/240.1 CTF800079.3Total Solids
MBTEXn
mg/kg dry 10/7/2410/7/240.01 EPA 8260D/5030B0.02Benzene
mg/kg dry 10/7/2410/7/240.03 EPA 8260D/5030BNDEthylbenzene
mg/kg dry 10/7/2410/7/240.02 EPA 8260D/5030B0.06Methyl tert-Butyl Ether (MTBE)
mg/kg dry 10/7/2410/7/240.03 EPA 8260D/5030B0.04Naphthalene
mg/kg dry 10/7/2410/7/240.03 EPA 8260D/5030BNDToluene
mg/kg dry 10/7/2410/7/240.08 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/kg dry 10/7/2410/7/240.281 EPA 8260B/C 5035A/[CALC]NDGasoline Range Organics
Diesel Range
mg/kg dry 10/4/2410/3/2463EPA 8015 CNDDiesel Range Organics
Project Name: Killians - Duchesne CtF WO#: 24J0221
www.ChemtechFord.com
Page 2 of 9Page 2 of 9
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
Underwood Environmental Consulting
Earl Underwood
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OCB-03
10/2/24 12:32 @ 2.3 °C
10/9/2024
Killians - Duchesne
Sample ID: WW-6 @ 9-10 ft
Lab ID: 24J0221-02Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 9/30/24 10:48
Preparation
Date/Time
Sampled By: Earl Underwood
Minimum
Reporting
Limit MethodResult
Inorganic
%10/3/2410/3/240.1 CTF800085.2Total Solids
MBTEXn
mg/kg dry 10/7/2410/7/240.01 EPA 8260D/5030BNDBenzene
mg/kg dry 10/7/2410/7/240.03 EPA 8260D/5030BNDEthylbenzene
mg/kg dry 10/7/2410/7/240.02 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/kg dry 10/7/2410/7/240.03 EPA 8260D/5030BNDNaphthalene
mg/kg dry 10/7/2410/7/240.03 EPA 8260D/5030BNDToluene
mg/kg dry 10/7/2410/7/240.08 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/kg dry 10/7/2410/7/240.264 EPA 8260B/C 5035A/[CALC]NDGasoline Range Organics
Diesel Range
mg/kg dry 10/4/2410/3/2459EPA 8015 CNDDiesel Range Organics
Project Name: Killians - Duchesne CtF WO#: 24J0221
www.ChemtechFord.com
Page 3 of 9Page 3 of 9
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
Underwood Environmental Consulting
Earl Underwood
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OCB-03
10/2/24 12:32 @ 2.3 °C
10/9/2024
Killians - Duchesne
Sample ID: WW-6 @ 12.5-13.5 ft
Lab ID: 24J0221-03Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 9/30/24 10:52
Preparation
Date/Time
Sampled By: Earl Underwood
Minimum
Reporting
Limit MethodResult
Inorganic
%10/3/2410/3/240.1 CTF800060.4Total Solids
MBTEXn
mg/kg dry 10/7/2410/7/240.01 EPA 8260D/5030BNDBenzene
mg/kg dry 10/7/2410/7/240.03 EPA 8260D/5030BNDEthylbenzene
mg/kg dry 10/7/2410/7/240.02 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/kg dry 10/7/2410/7/240.03 EPA 8260D/5030BNDNaphthalene
mg/kg dry 10/7/2410/7/240.03 EPA 8260D/5030BNDToluene
mg/kg dry 10/7/2410/7/240.10 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/kg dry 10/7/2410/7/240.323 EPA 8260B/C 5035A/[CALC]NDGasoline Range Organics
Diesel Range
mg/kg dry 10/7/2410/7/2483EPA 8015 CNDDiesel Range Organics
Project Name: Killians - Duchesne CtF WO#: 24J0221
www.ChemtechFord.com
Page 4 of 9Page 4 of 9
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
Underwood Environmental Consulting
Earl Underwood
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OCB-03
10/2/24 12:32 @ 2.3 °C
10/9/2024
Killians - Duchesne
Sample ID: WW-7 @ 5.5-6 ft
Lab ID: 24J0221-04Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 9/30/24 9:14
Preparation
Date/Time
Sampled By: Earl Underwood
Minimum
Reporting
Limit MethodResult
Inorganic
%10/3/2410/3/240.1 CTF800081.9Total Solids
MBTEXn
mg/kg dry 10/4/2410/4/240.01 EPA 8260D/5030BNDBenzene
mg/kg dry 10/4/2410/4/240.03 EPA 8260D/5030BNDEthylbenzene
mg/kg dry 10/4/2410/4/240.02 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/kg dry 10/4/2410/4/240.03 EPA 8260D/5030BNDNaphthalene
mg/kg dry 10/4/2410/4/240.03 EPA 8260D/5030BNDToluene
mg/kg dry 10/4/2410/4/240.08 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/kg dry 10/4/2410/4/240.283 EPA 8260B/C 5035A/[CALC]NDGasoline Range Organics
Diesel Range
mg/kg dry 10/7/2410/7/2461EPA 8015 CNDDiesel Range Organics
Project Name: Killians - Duchesne CtF WO#: 24J0221
www.ChemtechFord.com
Page 5 of 9Page 5 of 9
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
Underwood Environmental Consulting
Earl Underwood
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OCB-03
10/2/24 12:32 @ 2.3 °C
10/9/2024
Killians - Duchesne
Sample ID: WW-7 @ 9-10 ft
Lab ID: 24J0221-05Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 9/30/24 9:15
Preparation
Date/Time
Sampled By: Earl Underwood
Minimum
Reporting
Limit MethodResult
Inorganic
%10/3/2410/3/240.1 CTF800080.9Total Solids
MBTEXn
mg/kg dry 10/4/2410/4/240.01 EPA 8260D/5030BNDBenzene
mg/kg dry 10/4/2410/4/240.03 EPA 8260D/5030BNDEthylbenzene
mg/kg dry 10/4/2410/4/240.02 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/kg dry 10/4/2410/4/240.03 EPA 8260D/5030BNDNaphthalene
mg/kg dry 10/4/2410/4/240.03 EPA 8260D/5030BNDToluene
mg/kg dry 10/4/2410/4/240.09 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/kg dry 10/4/2410/4/240.306 EPA 8260B/C 5035A/[CALC]NDGasoline Range Organics
Diesel Range
mg/kg dry 10/7/2410/7/2462EPA 8015 CNDDiesel Range Organics
Project Name: Killians - Duchesne CtF WO#: 24J0221
www.ChemtechFord.com
Page 6 of 9Page 6 of 9
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
Underwood Environmental Consulting
Earl Underwood
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OCB-03
10/2/24 12:32 @ 2.3 °C
10/9/2024
Killians - Duchesne
Sample ID: WW-7 @ 13-14 ft
Lab ID: 24J0221-06Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 9/30/24 9:23
Preparation
Date/Time
Sampled By: Earl Underwood
Minimum
Reporting
Limit MethodResult
Inorganic
%10/3/2410/3/240.1 CTF800087.3Total Solids
MBTEXn
mg/kg dry 10/4/2410/4/240.01 EPA 8260D/5030BNDBenzene
mg/kg dry 10/4/2410/4/240.03 EPA 8260D/5030BNDEthylbenzene
mg/kg dry 10/4/2410/4/240.02 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/kg dry 10/4/2410/4/240.03 EPA 8260D/5030BNDNaphthalene
mg/kg dry 10/4/2410/4/240.03 EPA 8260D/5030BNDToluene
mg/kg dry 10/4/2410/4/240.08 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/kg dry 10/4/2410/4/240.254 EPA 8260B/C 5035A/[CALC]NDGasoline Range Organics
Diesel Range
mg/kg dry 10/7/2410/7/2457EPA 8015 CNDDiesel Range Organics
Project Name: Killians - Duchesne CtF WO#: 24J0221
www.ChemtechFord.com
Page 7 of 9Page 7 of 9
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
Underwood Environmental Consulting
Earl Underwood
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OCB-03
10/2/24 12:32 @ 2.3 °C
10/9/2024
Killians - Duchesne
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: Killians - Duchesne CtF WO#: 24J0221
www.ChemtechFord.com
Page 8 of 9Page 8 of 9
Page 9 of 9
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
Underwood Environmental Consulting
Attn: Earl Underwood
9475 North Silver Creek Road
Park City, UT 84098
Work Order: 24J0224
Project: Killians - Duchesne
10/9/2024
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 8
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
Underwood Environmental Consulting
Earl Underwood
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OCB - 03
10/2/24 12:32 @ 2.8 °C
10/9/2024
Killians - Duchesne
Sample ID: MW - 3
Lab ID: 24J0224-01Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 10/1/24 14:20
Preparation
Date/Time
Sampled By: Earl Underwood
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 10/7/2410/7/240.005 EPA 8260D/5030B0.152Benzene
mg/L 10/7/2410/7/240.012 EPA 8260D/5030B0.167Ethylbenzene
mg/L 10/7/2410/7/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 10/7/2410/7/240.012 EPA 8260D/5030B0.180Naphthalene
mg/L 10/7/2410/7/240.012 EPA 8260D/5030BNDToluene
mg/L 10/7/2410/7/240.038 EPA 8260D/5030B0.684Xylenes, total
Gasoline Range
mg/L 10/7/2410/7/240.125 EPA 8260B/C /5030A/[CALC]8.65Gasoline Range Organics
Diesel Range
mg/L 10/7/2410/7/241.0 EPA 8015 C3.6Diesel Range Organics
Project Name: Killians - Duchesne CtF WO#: 24J0224
www.ChemtechFord.com
Page 2 of 8Page 2 of 8
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
Underwood Environmental Consulting
Earl Underwood
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OCB - 03
10/2/24 12:32 @ 2.8 °C
10/9/2024
Killians - Duchesne
Sample ID: MW - 4
Lab ID: 24J0224-02Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 10/1/24 13:55
Preparation
Date/Time
Sampled By: Earl Underwood
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 10/7/2410/7/240.005 EPA 8260D/5030BNDBenzene
mg/L 10/7/2410/7/240.012 EPA 8260D/5030B0.038Ethylbenzene
mg/L 10/7/2410/7/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 10/7/2410/7/240.012 EPA 8260D/5030B0.023Naphthalene
mg/L 10/7/2410/7/240.012 EPA 8260D/5030B0.012Toluene
mg/L 10/7/2410/7/240.038 EPA 8260D/5030B0.216Xylenes, total
Gasoline Range
mg/L 10/7/2410/7/240.125 EPA 8260B/C /5030A/[CALC]2.36Gasoline Range Organics
Diesel Range
mg/L 10/7/2410/7/241.0 EPA 8015 C1.2Diesel Range Organics
Project Name: Killians - Duchesne CtF WO#: 24J0224
www.ChemtechFord.com
Page 3 of 8Page 3 of 8
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
Underwood Environmental Consulting
Earl Underwood
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OCB - 03
10/2/24 12:32 @ 2.8 °C
10/9/2024
Killians - Duchesne
Sample ID: MW - 5
Lab ID: 24J0224-03Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 10/1/24 15:12
Preparation
Date/Time
Sampled By: Earl Underwood
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 10/7/2410/7/240.005 EPA 8260D/5030B0.870Benzene
mg/L 10/7/2410/7/240.012 EPA 8260D/5030B0.204Ethylbenzene
mg/L 10/7/2410/7/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 10/7/2410/7/240.012 EPA 8260D/5030B0.114Naphthalene
mg/L 10/7/2410/7/240.012 EPA 8260D/5030B0.014Toluene
mg/L 10/7/2410/7/240.038 EPA 8260D/5030B0.946Xylenes, total
Gasoline Range
mg/L 10/7/2410/7/240.125 EPA 8260B/C /5030A/[CALC]6.77Gasoline Range Organics
Diesel Range
mg/L 10/7/2410/7/241.0 EPA 8015 C1.4Diesel Range Organics
Project Name: Killians - Duchesne CtF WO#: 24J0224
www.ChemtechFord.com
Page 4 of 8Page 4 of 8
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
Underwood Environmental Consulting
Earl Underwood
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OCB - 03
10/2/24 12:32 @ 2.8 °C
10/9/2024
Killians - Duchesne
Sample ID: MW - 6
Lab ID: 24J0224-04Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 10/1/24 17:30
Preparation
Date/Time
Sampled By: Earl Underwood
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 10/8/2410/8/240.005 EPA 8260D/5030BNDBenzene
mg/L 10/8/2410/8/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L J-LOW-L10/8/2410/8/240.008 EPA 8260D/5030B0.040Methyl tert-Butyl Ether (MTBE)
mg/L 10/8/2410/8/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 10/8/2410/8/240.012 EPA 8260D/5030BNDToluene
mg/L 10/8/2410/8/240.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 10/8/2410/8/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 10/9/2410/8/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Killians - Duchesne CtF WO#: 24J0224
www.ChemtechFord.com
Page 5 of 8Page 5 of 8
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
Underwood Environmental Consulting
Earl Underwood
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OCB - 03
10/2/24 12:32 @ 2.8 °C
10/9/2024
Killians - Duchesne
Sample ID: MW - 7
Lab ID: 24J0224-05Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 10/1/24 17:50
Preparation
Date/Time
Sampled By: Earl Underwood
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 10/8/2410/8/240.005 EPA 8260D/5030BNDBenzene
mg/L 10/8/2410/8/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L J-LOW-L10/8/2410/8/240.008 EPA 8260D/5030B0.010Methyl tert-Butyl Ether (MTBE)
mg/L 10/8/2410/8/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 10/8/2410/8/240.012 EPA 8260D/5030BNDToluene
mg/L 10/8/2410/8/240.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 10/8/2410/8/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 10/8/2410/8/241.0 EPA 8015 CNDDiesel Range Organics
Project Name: Killians - Duchesne CtF WO#: 24J0224
www.ChemtechFord.com
Page 6 of 8Page 6 of 8
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
Underwood Environmental Consulting
Earl Underwood
9475 North Silver Creek Road
Park City, UT 84098
PO#:
Receipt:
Date Reported:
Project Name:
OCB - 03
10/2/24 12:32 @ 2.8 °C
10/9/2024
Killians - Duchesne
Report Footnotes
Abbreviations
ND = Not detected at the corresponding Minimum Reporting Limit (MRL).
1 mg/L = one milligram per liter or 1 mg/kg = one milligram per kilogram = 1 part per million.
1 ug/L = one microgram per liter or 1 ug/kg = one microgram per kilogram = 1 part per billion.
1 ng/L = one nanogram per liter or 1 ng/kg = one nanogram per kilogram = 1 part per trillion.
On calculated parameters, there may be a slight difference between summing the rounded values shown on the report
vs the unrounded values used in the calculation.
Flag Descriptions
J-LOW-L = Estimated low due to low recovery of LCS
Project Name: Killians - Duchesne CtF WO#: 24J0224
www.ChemtechFord.com
Page 7 of 8Page 7 of 8
Page 8 of 8

APPENDIX C

PHOTO DOCUMENTATION

Killians Service
150 East Main Street
Duchesne, Utah
Facility ID # 9000190
Release Site OCB
Photo Documentation
Page 1 of 2
Installing MW-7 with ODEX / DPT drilling rig Daylighting MW-6 for utility clearance
September 30, 2024
Killians Service
150 East Main Street
Duchesne, Utah
Facility ID # 9000190
Release Site OCB
Photo Documentation
Page 2 of 2
Soil from MW-7 Soil from MW-6
September 30, 2024