DERR-2025-003849

2410 WEST CALIFORNIA AVENUE • SALT LAKE CITY, UTAH 84104
PHONE [phone]
Website: www.wasatch-environmental.com • e-Mail: [e-mail]
Ms. Sara Meess May 5, 2025
Redevelopment Manager Project No.: 2737-001C
Ogden City Redevelopment Agency
2549 Washington Boulevard, Suite 420
Ogden, Utah 84401

SUBJECT: Monitoring Well Installation and Sampling
Former Super Sonic Carwash
2534 South Wall Avenue
Ogden, Utah
Facility I.D.: 1200607
Release Site.: MJG

1. INTRODUCTION

Wasatch Environmental, Inc., (Wasatch) has completed additional monitoring well installation and
sampling activities at the proposed Wall Avenue Apartments property (Site), located at 2534 South Wall
Avenue in Ogden, Utah. See Figure 1 for a Site vicinity map. The activities consisted of installing,
developing, and surveying three new shallow groundwater monitoring wells at the Site; and the
completion of two groundwater sampling events that included gauging and sampling six wells at the Site.

2. BACKGROUND

The Site is currently a vacant lot on the east side of Wall Avenue. There is an asphalt-paved access road
which extends along the south edge of the Site. There is a large detention basin (155 feet east-west and
70 feet north-south) which extends approximately 5 feet below the surrounding grade in the center of the
Site. The detention basin forms a large part of the Site and has gentle side slopes around the edges and
a relatively flat bottom with a gentle slope down toward the west. Vegetation at the Site consists of grass
and weeds.

The Site is bordered on the north by the Royal Hotel and on the south by commercial properties. East of
the Site is a parking lot and an apartment building, with an electrical substation to the southeast.
Gateway Distributing Company is to the south. The western boundary of the Site is adjoined by Wall
Avenue, which is a four-lane asphalt-paved road, followed by Union Station.

The majority of this Site background was obtained from the Applied Geotechnical Engineering
Consultants, Inc., (AGEC) Environmental Sampling Report No. 5, dated June 17, 2014. The Site was
previously occupied by the Ogden-Troy Laundry and Dry Cleaning Company from the early 1900s to the
late 1950s. The laundry buildings were removed in the late 1950s and replaced with an automotive repair
shop, car wash, gas station, and a smaller laundry shop.

AGEC’s review of historic Polk city directories and telephone books indicate that the car wash was built in
1959 at 2530 South Wall Avenue and the Import Car Service repair garage was built in the rear (east
end) of the lot in the mid-1960s. The repair shop is listed until about 1986 at 2530 South Wall Avenue
(rear). The Ogden Troy Laundry and Model Cleaners is listed at 2538 South Wall Avenue from 1960 to
1965 when the store was vacated. The Super Sonic car wash was removed in the early 1990s. The
Super Sonic car wash is listed as a service station in the telephone books until 1975 when presumably
the gas station was closed. The location of the gas tanks and pumps for the gas station was not obvious
in a review of aerial photographs from 1970, 1971, 19 75, 1980, 1985, and 1990. The status of the tanks
for the service station was unknown as the business closed before the Utah Department of Environmental

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Page 2
Quality (DEQ) began to register underground fuel tanks in the mid-1980s. A storm water retention pond
was excavated in the middle of the property in 2003 when the adjacent 25th Street Union Square
Condominiums were constructed to the east-northeast. The adjacent Royal Hotel was built to the north in
1914 and the rear building to the north was built in the 1920s and later converted to a parking garage.

During a geotechnical investigation by AGEC in December 2007, petroleum odors were noticed in a test
pit completed on the east end of the Site. In February 2008, AGEC performed a limited subsurface
investigation by sampling two locations on the Site with a Geoprobe in the vicinity of the former dry
cleaning laundry buildings and the service garage to help determine if significant subsurface
contamination was present at these locations. Total petroleum hydrocarbons as diesel-range organics
(TPH-DRO) and total petroleum hydrocarbons as gasoline-range organics (TPH-GRO) were detected in
the soil and groundwater above the Utah Initial Screening Levels (ISLs) in the samples obtained from the
east boring (B-2) by the former service garage. Chlorinated solvents were not detected in the soil or
groundwater samples from either boring.

During a subsequent subsurface investigation completed by the Utah Division of Environmental
Response and Remediation (DERR) in June 2008, a single abandoned underground storage tank (UST)
was discovered on the eastern portion of the Site. The 600-gallon waste oil UST was removed in
September 2008, and approximately 200 cubic yards of petroleum impacted soil were removed at that
time. After the soil was removed, the DERR oversaw the installation of four groundwater monitoring wells
in the vicinity of the UST.

Groundwater sampling of the four wells in September 2008 completed by the DERR indicated that MW-2
was impacted by petroleum hydrocarbons with concentrations of TPH-GRO, TPH-DRO, and total
recoverable petroleum hydrocarbon (TRPH) above the Utah Risk -Based Corrective Action (RBCA) Tier 1
Screening Levels (SLs). Soil samples obtained during the installation of two of the monitoring wells (MW -
2 and MW-3) indicated that soil remained at the Site at concentrations above the RBCA Tier 1 SLs.

A trench approximately 9 to 12 feet deep, 2 to 10 feet wide, and approximately 100 feet long was
excavated in early September 2009 in the vicinity of the previously detected soil and groundwater
contamination. The trench extended in a north-south direction between the existing parking lot to the east
and the detention basin to the west.

AGEC collected soil samples from the trench walls and bottom of the trench to help determine if
significantly contaminated soil remained in this part of the Site. Eight soil samples were obtained by
AGEC on September 11, 2009. The soil samples were obtained with the use of a backhoe bucket to
excavate the samples from the bottom of the trench, approximately 9 to 11 feet below the ground surface
(bgs).

The analytical test results indicated that concentrations of naphthalene, TPH-DRO and/or TPHGRO were
reported above the laboratory method detection limits in six of the eight soil samples. None of the other
analyzed compounds (benzene, ethylbenzene, methyl tertiary-butyl ether [MTBE], toluene, and total
xylenes) were detected above the laboratory method detection limits in the soil samples.

The concentration of TPH-GRO reported in sample SS#1 on the north end of the excavation was 230
parts per million (ppm) which exceeds the Utah ISL of 150 ppm, but below the Utah RBCA Tier 1 SL of
1,500 ppm. None of the remaining samples contained analytes at concentrations above the Utah ISL.

AGEC returned to the Site on December 17, 2009. The majority of the trench had been backfilled with
the exception of the northern 40 feet. The north end of the excavation had been extended farther west
approximately 15 feet and approximately 10 to 12 feet bgs. The excavated material was stockpiled on
the west side of the excavation.

AGEC obtained three soil samples from the bottom of the west side of the excavation to help determine if
significantly contaminated soil remained in this part of the Site. The analytical test results indicated that
concentrations of ethylbenzene, naphthalene, xylenes, and TPH -DRO and/or TPH-GRO were reported

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Page 3
above the laboratory method detection limits in the three soil samples. None of the other analyzed
compounds (benzene, MTBE, and toluene) were detected above the laboratory method detection limits in
the soil samples. The concentrations of TPH-GRO reported in samples SS#1 (390 ppm) and SS#2 (790
ppm) exceeded the Utah ISL of 150 ppm, but were below the Utah RBCA Tier 1 SL of 1,500 ppm. None
of the remaining samples contained analytes at concentrations above the Utah IS L.

The excavated material was temporarily stockpiled west of the excavation and was removed for final
disposal at Allied Waste located at 675 South Gladiola Street in Salt Lake City, Utah. Based on the
dimensions of the excavation and the shipping manifests, an estimated 660 cubic yards of soil were
removed.

AGEC returned to the Site on January 6, February 5, and March 20, 2014, and obtained soil samples
from 10 test pits. The previous excavation had already been backfilled. No evidence of the previous
monitoring wells was observed.

The test pits were excavated with a rubber-tired backhoe (TP1 /6/14-1 to TP1 /6/14-5, TP 2/5/14, and TP
3/20/14-1 to TP 3/20/14-4) at the approximate locations indicated on Figure 2. Each test pit extended to
approximately 11 feet bgs with the exception of TP 3/20/14-4 which was excavated at the bottom of the
storm water detention pond near the inlet pipe, approximately 5 feet bgs. Groundwater was encountered
at approximately 10 feet bgs in the test pits with the exception of TP 3/20/14-4 where the groundwater
was encountered approximately 4 feet bgs. Varying amounts of fill were observed to approximately 8 feet
bgs where sandy gravel with cobbles was encountered. The sandy gravel with cobbles extended to at
least 11 to 15 feet bgs.

No soil staining or petroleum odors were observed in the fill or native soils until the groundwater was
encountered. Evidence of petroleum contamination was observed in all 10 test pits near and below the
groundwater elevation. As observed in the other excavations and test pits, sandy gravel with cobbles is
the predominant soil type at and below the groundwater elevation, and deep excavations were difficult
due to the excavation continuously caving in/refilling the excavation.

The analytical test results indicated that concentrations of TPH -DRO and TPH-GRO remain in the soil
above the Utah ISL in TP 1/6/14-1 and TP 1/6/14-5. One soil sample (TP 1/6/ 14-5) contained TPH-DRO
above the Utah RBCA Tier 1 SL. Concentrations of TPHDRO were above the Utah ISL of 500 milligrams
per kilogram (mg/kg) in at least one sample from the test pit excavated on February 5, 2014, and all five
test pits excavated on March 20, 2014, but below the Utah RBCA Tier 1 SL of 5,000 mg/kg. The
concentrations of TPH-GRO were above the Utah ISL in at least one sample from the test pit excavated
on February 5, 2014, and three of the five test pits excavated on March 20, 2014, but below the Utah
RBCA Tier 1 SL.

AGEC returned to the Site on June 6, 2014, and observed the excavation of four more test pits farther to
the west of the previous test pits to help determine the extent of the soil impacted above the Utah ISLs.
TP 6/6/14-2 was excavated at the bottom of the storm water detention pond, approximately 5 feet bgs.
As observed in the other excavations and test pits, sandy gravel with cobbles is the predominant soil type
at and below the groundwater elevation and deep excavations are difficult due to the excavation
continuously caving into the excavation. A concrete wall and floor slab covered with 3 to 4 feet of brick
demolition debris was encountered northwest of test pit 6/6/14-3. The demolition debris and the concrete
floor extended at least 20 feet farther west based on additional excavation activities.

Evidence of petroleum contamination was observed in test pit 6/6/14-3 beginning near the groundwater
elevation at approximately 10 feet bgs and extended to the maximum depth excavated at approximately
11 ½ feet bgs. Soil samples were obtained from each test pit at varying depths above and below the
groundwater elevation with the use of the backhoe bucket.

Nine soil samples from June 6, 2014, were obtained by a Utah Certified Groundwater and Soil Sampler in
general accordance with the sampling protocol as set by Utah State and the Environmental Protection

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Agency. The nine soil samples were submitted for analysis of MTBE, benzene, toluene, ethylbenzene,
total xylenes, and naphthalene (MBTEXN), TPH-GRO, and TPH-DRO.

The test results indicated that concentrations of naphthalene, TPH -DRO, and/or TPH-GRO were reported
above the laboratory method detection limits in at least one of the soil samples. None of the other
analyzed compounds (benzene, xylenes, MTBE, and toluene) were detected. The detected
concentrations of TPH-DRO, TPH-GRO, and naphthalene were all below Utah ISL.

No remediation has been completed at the Site to reduce contaminant mass since the initial trench
excavation was completed.

On April 24, 2023, Wasatch directed the completion of five additional soil borings, using direct -push
drilling techniques, to evaluate soil and groundwater conditions at the Site. The objective of this
investigation was to further evaluate the former automotive repair shop, the former dry cleaners, and
determine if petroleum hydrocarbon impacts are still present at the Site at concentrations that exceed the
applicable Utah ISLs. The results of the subsurface investigation indicate the presence of petroleu m
hydrocarbons at concentrations above Utah’s ISLs and RBCA Tier 1 Screening Levels remain on the
eastern portion of the Site. The historical and current soil and groundwater data were used to delineate
the potential soil excavation boundary at the Site.

The Client has expressed interest in achieving regulatory closure of release MJG through the use of
institutional and engineering controls at the Site; or, at a minimum, to reduce the area that would require
active remediation. Given this, DERR requested that additional monitoring wells be installed and
sampled to further evaluate the remaining petroleum hydrocarbon impacts from the release.

3. OBJECTIVE

The objective of this work was to sufficiently define the petroleum impacts to groundwater at the Site to
determine a pathway to regulatory closure of the release.

4. FIELD METHODOLOGY

See Appendix A for a photolog of the field activities.

4.1 Monitoring Well Installation, Development, and Surveying

On December 30, 2024, Wasatch Staff Geologist Ryan Panasy installed three additional monitoring wells
(MW-11, MW-12, and MW-13) at the Site. Each well was completed as follows:

• Well screen was placed from 5 to 20 feet bgs and consisted of 0.01-slot, schedule 40, 2-inch
polyvinyl chloride (PVC) well screen material.

• Placement of a flat bottom well foot at the bottom of the screen.

• Well casing attached to the top of the screen and extending to approximately 0.5 feet bgs
consisting of schedule 40, 2-inch PVC, well casing material.

• A 10/20 filter pack sand material will be placed in the annulus space from approximately 3 to 20
feet bgs.

• A bentonite well seal was placed in the annulus space from approximately 1 to 3 feet bgs.

• A surface completion consisting of a steel flush-mount well vault placed in concrete.

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Approximately 24 hours after the monitoring wells were installed, Wasatch developed each monitoring
well using disposable bailers and over pumping techniques (where possible). Wasatch considered well
development to be completed if a minimum volume of five casing volumes of groundwater had been
purged from the well or the well showed significant improvement in visual turbidity. All purge water was
spread on the ground surface near the well. Additionally, Wasatch surveyed the top-of-casing elevation
(to the nearest hundredth of a foot) for each new well at the Site using a Spectra Precision Laser Plan
surveying equipment and tied them into the existing monitoring well network.

4.2 Monitoring Well Sampling

Wasatch waited a minimum of 72 hours following the completion of well development activities before
conducting the initial groundwater sampling event completed on January 3, 2025. The second
groundwater sampling event was completed on April 1, 2025.

For each sampling event, Wasatch obtained depth to groundwater measurements from each of the
monitoring wells using an electronic water level probe. The electronic probe and tape were
decontaminated before measuring the water level in the first monitoring well, and between each of the
monitoring wells, with a solution of Alconox® and distilled water, followed by a triple rinse with distilled
water. Depth to groundwater measurements were obtained from the monitoring wells to evaluate
groundwater flow direction.

One groundwater sample was collected from monitoring wells MW-8 through MW-13 per sampling event
using standard purge sampling techniques. Each monitoring well was bailed with a new disposable bailer
and sampled following the standard purge sampling technique. Groundwater samples were collected
using gloved hands. The groundwater samples were dispensed into 40-milliliter (mL) 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/bottles were each labeled with the sample
location, sample identification, date, and time of sample collection, and requested analysis. All
groundwater samples were placed in a cooler with ice and transported under chain -of-custody protocol to
CTF for analysis.

Groundwater samples MW-8 through MW-13 were analyzed for TPH-GRO and MBTEXN using U.S. EPA
Method 8260D and TPH-DRO using U.S. EPA Method 8015D with SGT. Groundwater sample MW-10
was additionally analyzed for TPH-GRO fractionation using U.S. EPA Method 8260D and TPH-DRO
fractionation using U.S. EPA Method 8270E.

5. FIELD OBSERVATIONS AND LABORATORY ANALYTICAL RESULTS

5.1 Monitoring Well Installation, Development, and Surveying

Wasatch supervised the successful installation of three additional groundwater monitoring wells at the
Site. The monitoring wells were installed by DPS using direct-push drilling techniques. The well
construction logs are presented as Appendix B.

Approximately 42 to 66 gallons of groundwater were purged from each monitoring well during the
development activities. The turbidity of all wells was significantly reduced during the development
activities. All development water was disposed on the ground surface near each well.

Wasatch personnel surveyed the monitoring wells top-of-casing (TOC) elevations. Monitoring well MW-6
was assigned an arbitrary datum of 100.00 feet. The difference in elevations from MW -6 to all other well
TOCs were adjusted based on the survey data to calculate each well’s TOC elevation.

Wasatch Environmental Inc.
Page 6
5.2 Monitoring Well Sampling

Groundwater elevation data were used for evaluating the piezometric surface of the shallow groundwater
for each sampling event. Based on the groundwater elevation data collected on January 3, 2025, it
appears that the shallow groundwater flow direction is generally to the northeast at 0.0 10 feet/foot.
Based on the groundwater elevation data collected on April 1, 2025, it appears that the shallow
groundwater flow direction is generally to the northeast at 0.035 feet/foot. See Figures 4 and 5 for the
January 3, 2025, and the April 1, 2025, shallow groundwater piezometric surface maps, respectively.

Analyte concentrations in groundwater were compared to the U.S. EPA Maximum Contamination Levels
(MCLs), Utah ISLs, and the DERR RBCA SSCLs (see Appendix D), where applicable. A groundwater
exceedance map (for the Wasatch collected data only) is presented as Figure 3. Groundwater analytical
data are summarized in Table 1. The laboratory analytical report and chain-of-custody documentation
are presented in Appendix C. See Appendix E for the groundwater sampling forms.

5.2.1 January 2025 Sampling Event

TPH-GRO was detected in groundwater samples MW-8 (459 μg/L), MW-9 (209 μg/L), and MW-
10 (710 μg/L). All concentrations were below the Utah ISL for TPH-GRO of 1,000 μg/L. TPH-
GRO was not detected in any other groundwater sample.

TPH-DRO was detected in groundwater samples MW-8 (1,300 μg/L) and MW-10 (1,100 μg/L).
Both concentrations exceed the Utah ISL for TPH-DRO of 1,000 μg/L. TPH-DRO was not
detected in any other groundwater sample.

Groundwater sample MW-10 had TPH-GRO fractionation and TPH-DRO fractionation detections
for C9-C10 Aliphatic hydrocarbons (569 μg/L), C9-C10 alkyl benzenes (140 μg/L), C13-C16
aliphatic hydrocarbons (124 μg/L), and C17-C21 aliphatic hydrocarbons (47 μg/L) at
concentrations below the applicable DERR RBCA SSCL for Groundwater Ingestion and all other
exposure scenarios. Groundwater sample MW-10 had a C11-C12 aliphatic hydrocarbons
detection of 10,700 μg/L which exceeds the DERR RBCA SSCL for Groundwater Ingestion of
10,200 μg/L, but is below all other exposure scenarios.

No other TPH-GRO/TPH-DRO fractionation range concentrations exceeded the calculated SSCL
for any of the exposure risks. No other petroleum hydrocarbons were detected in the
groundwater samples collected.

5.2.2 April 2025 Sampling Event

Benzene was detected in groundwater sample MW-8 at a concentration of 2 μg/L. This
concentration is below the Utah ISL for benzene of 5 μg/L. Benzene was not detected in any
other groundwater sample.

Toluene was detected in groundwater sample MW-8 at a concentration of 5 μg/L. This
concentration is below the Utah ISL for benzene of 1,000 μg/L. Toluene was not detected in any
other groundwater sample.

TPH-DRO was detected in groundwater sample MW-10 at a concentration of 3,600 μg/L. This
concentration exceeds the Utah ISL for TPH-DRO of 1,000 μg/L. TPH-DRO was not detected in
any other groundwater sample.

No TPH-GRO/TPH-DRO fractionation range concentrations exceeded the calculated SSCL for
any of the exposure risks. No other petroleum hydrocarbons were detected in the groundwater
samples collected.

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6. CONCLUSIONS AND RECOMMENDATIONS

Wasatch successfully completed installation, development, surveying, and sampling of three additional
groundwater monitoring wells at the Site. Additionally, two groundwater sampling events were completed
in which monitoring wells MW-8 through MW-13 were sampled.

Based on the groundwater elevation data, groundwater at the Site flows generally to the northeast at
0.010 to 0.035 feet/foot.

Petroleum hydrocarbon impacts to groundwater exceeding their applicable Utah ISLs were detected in
monitoring wells MW-8 and MW-10 in one or more sampling events. In general, TPH-GRO and TPH-
DRO concentrations in groundwater decreased from the January 2025 sampling event to the April 2025
sampling event. Monitoring well MW-10 exhibited an increase in TPH-DRO concentrations in
groundwater. However, the TPH-GRO fractionation and TPH-DRO fractionation concentrations in
groundwater sample MW-10 were all non-detect in the April 2025 sampling event and only the C11-C12
aliphatic hydrocarbon concentration exceeded the Ingestion of Groundwater SSCL for the January
sampling event only. Given that the structures within the impacted groundwater area are all connected to
the municipal drinking water system, this risk is considered to be an incomplete exposure pathway.
Additionally, none of the analytes exhibited concentrations that exceed the Indoor or Outdoor Air Vapor
Inhalation SSCLs; therefore, it is Wasatch’s opinion that the groundwater impacts are not a vapor
intrusion risk to off-Site structures.

Based on the totality of the groundwater data, it is Wasatch’s opinion that the extent of the groundwater
impacts have been sufficiently defined, and additional investigation into groundwater impacts are not
warranted at this time. Additionally, it is Wasatch’s opinion that the TPH-DRO concentration (59,400
μg/L) from the MW-10 groundwater sample collected on July 2, 2024, is likely not representative of typical
impacts in this area as no other samples collected at the well have exhibited similar concentra tions.
Wasatch suspects this result may be due to analytical laboratory errors.

Given the totality of the data collected from the Site, the age and apparent degradation of the
contaminants, and the low exposure risk to on-Site and off-Site receptors; it is Wasatch’s opinion that the
petroleum hydrocarbon impacts at the Site can be managed through the implementation of institutional
and engineering controls, and active remediation should not be required. Institutional and engineering
controls would include, but are not limited to, restriction of the use of shallow groundwater at the Si te, the
implementation of vapor intrusion mitigation measures for any on-Site structures, recording a DERR-
approved Environmental Covenant and Site Management Plan to the Weber County Recorder’s office,
and providing appropriate impacted media handling procedures for the Site. Wasatch requests closure
through the implementation of the discussed institutional and engineering controls.

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.

Blake B. Downey, P.G. Rachel Kubina
Vice President and Senior Project Hydrogeologist Staff Geologist

Wasatch Environmental Inc.
Page 8
FIGURES

Figure 1 – Site Vicinity Map
Figure 2 – Historical Sample Location Map
Figure 3 – Groundwater Exceedance Map
Figure 4 – January 3, 2025, Potentiometric Surface Map
Figure 5 – April 1, 2025, Potentiometric Surface Map

TABLE

Table 1 – Groundwater Analytical Data

APPENDICES

Appendix A – Photolog
Appendix B – Boring and Well Construction Logs
Appendix C – Laboratory Analytical Reports
Appendix D – DERR RBCA SSCL Calculator Documents
Appendix E – Groundwater Sampling Forms

Figures

The use or reuse of this information is restricted to the referenced document unless otherwise authorized.
Wasatch Environmental Copyright 2006
WALL AVENUE APARTMENTS PROPERTY WEI 2737-001C
Figure 1Site Vicinity Map
HW
Y
8
9
Li
n
c
o
l
n

Ave
n
u
e
27th Street
24th Street
Approximate
Site Boundary
Wal
l

Ave
n
u
e
1 inch = 400 feet
The use or reuse of this information is restricted to the referenced document unless otherwise authorized.
Wasatch Environmental Copyright 2006
WEI 2737-001C
Figure 2 Historical Sample Location Map
Former Carwash Building
Former
Troy Laundry
(After Fire)
Former
Troy Laundry
(Before Fire)
Orange Dashes
Former
Troy Laundry
Rear Building
(Orange Dashes)
Former
Dry Cleaning
Area
Former
Tank
Location of
Former Dispensers
Suspect Location
of FormerUSTs
Former Auto Service
Building
Former
Apartment
Building
Former
Auto Polishing
and Storage
Building
August 2023 Wasatch Boring Location
Previous Wasatch Soil Gas Sample Location
2009 AGEC Trench Wall Soil Sample Location
Former AGEC Monitoring Well Location
2014 AGEC Test Pit Sample Location
2008 DERR Boring/Sample Location
2008 AGEC Sample Location
LEGEND
1 inch = 29 feet
Wasatch Boring Location
WALL AVENUE APARTMENTS PROPERTY
Previous Wasatch Monitoring Well Location
March 2023 Wasatch Boring Location
New Wasatch Monitoring Well Location
The use or reuse of this information is restricted to the referenced document unless otherwise authorized.
Wasatch Environmental Copyright 2006
WEI 2737-001C
Figure 3 Groundwater Exceedance Map
Former Carwash Building
Former
Troy Laundry
(After Fire)
Former
Troy Laundry
(Before Fire)
Orange Dashes
Former
Troy Laundry
Rear Building
(Orange Dashes)
Former
Dry Cleaning
Area
Former
Tank
Location of
Former Dispensers
Suspect Location
of FormerUSTs
Former Auto Service
Building
Former
Apartment
Building
Former
Auto Polishing
and Storage
Building
Wasatch April 2023 Boring Location
LEGEND
1 inch = 29 feet
Wasatch August 2023 Boring Location
*Groundwater concentrations expressed
in micrograms per liter (µg/L)
Previous Wasatch Monitoring Well Location
January 3, 2024
TPH-DRO: 1,100
April 1, 2024
TPH-DRO: 3,600

WALL AVENUE APARTMENTS PROPERTY
New Wasatch Monitoring Well Location
Non-Detect

Non-Detect
For Both Events

January 3, 2024
TPH-DRO: 1,300
April 1, 2024
Non-Detect

January 3, 2024
No Exceedances
April 1, 2024
Non-Detect

Non-Detect
For Both Events

Non-Detect
For Both Events

The use or reuse of this information is restricted to the referenced document unless otherwise authorized.
Wasatch Environmental Copyright 2006
WEI 2737-001C
Figure 4
Approximate
Site Boundary
1 inch = 29 feet
MW-5
MW-10
(89.68)
MW-9
(89.46)
MW-7
MW-8
(91.20)
MW-6
LEGEND
Groundwater Elevation Contour
0.01 Groundwater Elevation (feet)
Monitoring Well Location
January 3, 2025, Potentiometric Surface Map
Hydraulic Gradient
Northeast at 0.01 ft./ft
91.
0
0
9
0
.
4
0
9
0
.
7
0
8
9
.
8
0
8
9
.
2
0
8
9
.
5
0
9
0
.
1
0
WALL AVENUE APARTMENTS PROPERTY
MW-11
(88.92)
MW-13
(88.55)
MW-12
(88.97)
8
8
.
9
0
8
8
.
6
0
The use or reuse of this information is restricted to the referenced document unless otherwise authorized.
Wasatch Environmental Copyright 2006
WEI 2737-001C
Figure 5
Approximate
Site Boundary
1 inch = 29 feet
MW-5
(90.39)
MW-10
(90.26)
MW-9
(90.06)
MW-7
(90.20)
MW-8
(90.18)
MW-6
(90.36)
LEGEND
Groundwater Elevation Contour
0.01 Groundwater Elevation (feet)
Monitoring Well Location
April 1, 2025, Potentiometric Surface Map
Hydraulic Gradient
Northeast at 0.035 ft./ft90.38
90.30
90.
2
2
90
.
1
4
8
9
.
6
6
8
9
.
9
0
8
9
.
9
8
9
0
.
0
6
WALL AVENUE APARTMENTS PROPERTY
MW-11
(89.74)MW-13
(89.55)
MW-12
(89.82)
8
9
.
8
2
8
9
.
5
8

Table

TP
H
-
G
R
O
TP
H
-
D
R
O
C5
-
C
6

A
l
i
p
h
a
t
i
c

hy
d
r
o
c
a
r
b
o
n
s
C7
-
C
8

A
l
i
p
h
a
t
i
c

hy
d
r
o
c
a
r
b
o
n
s
C9
-
C
1
0

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GP-1 ---10.5 ---4/24/2023 <500 <100 NA NA NA NA NA NA NA NA NA NA <1.00 <1.00 <1.00 <5.00 <1.00 <3.00 <1.00 <1.00 <1.00 <1.00 NA NA NA NA NA
GP-2 ---14 ---4/24/2023 <500 <100 NA NA NA NA NA NA NA NA NA NA <1.00 <1.00 <1.00 <5.00 <1.00 <3.00 <1.00 <1.00 <1.00 <1.00 NA NA NA NA NA
GP-3 ---14 ---4/24/2023 674 467 NA NA NA NA NA NA NA NA NA NA <1.00 <1.00 <1.00 <5.00 <1.00 <3.00 <1.00 1.00 <1.00 <1.00 0.411 <0.250 <2.00 62.4 <2.00
GP-4 ---13 ---4/24/2023 4,660 14,800 NA NA NA NA NA NA NA NA NA NA <5.00 <5.00 <5.00 <25.0 <5.00 <15.0 16.1 34.1 27.3 5.47 1.33 1.17 4.89 281 13.6
GP-5 ---5 ---4/24/2023 <500 <200 NA NA NA NA NA NA NA NA NA NA <1.00 <1.00 <1.00 <5.00 <1.00 <3.00 <1.00 <1.00 <1.00 <1.00 NA NA NA NA NA
GP-1 ---10 ---8/31/2023 <125 <1,000 NA NA NA NA NA NA NA NA NA NA <5 <5 <12 <12 <12 <12 NA NA NA NA NA NA NA NA NA
GP-2 ---10 ---8/31/2023 17,400 16,600 <125 <125 11,700 5,650 <10 447 <10 289 733 <10 <5 <5 <12 69 <12 <12 NA NA NA NA 69 NA NA NA NA
GP-3 ---14.5 ---8/31/2023 459 1,700 <125 <125 <125 421 <10 34 28 83 159 <10 <5 <5 <12 38 <12 <12 NA NA NA NA 38 NA NA NA NA
GP-4 ---8 ---8/31/2023 1,150 2,000 NA NA NA NA NA NA NA NA NA NA <5 <5 <12 <12 <12 <12 NA NA NA NA NA NA NA NA NA
GP-5 ---14 ---8/31/2023 1,100 17,600 <125 <125 1,100 <125 <10 39 10 89 446 <10 <5 <5 <12 <12 <12 <12 NA NA NA NA <12 NA NA NA NA
GP-6 ---13.5 ---8/31/2023 <125 <1,000 NA NA NA NA NA NA NA NA NA NA <5 <5 <12 <12 <12 <12 NA NA NA NA NA NA NA NA NA
GP-7 ---13.5 ---8/31/2023 <125 2,200 NA NA NA NA NA NA NA NA NA NA <5 <5 <12 <12 <12 <12 NA NA NA NA NA NA NA NA NA
GP-8 ---14.5 ---8/31/2023 <125 <1,000 NA NA NA NA NA NA NA NA NA NA <5 <5 <12 <12 <12 <12 NA NA NA NA NA NA NA NA NA
GP-9 ---13.5 ---8/31/2023 <125 <1,000 NA NA NA NA NA NA NA NA NA NA <5 <5 <12 <12 <12 <12 NA NA NA NA NA NA NA NA NA
GP-10 ---14.5 ---8/31/2023 <125 <1,000 NA NA NA NA NA NA NA NA NA NA <5 <5 <12 <12 <12 <12 NA NA NA NA NA NA NA NA NA
GP-11 ---9 ---8/31/2023 <125 <1,000 NA NA NA NA NA NA NA NA NA NA <5 <5 <12 <12 <12 <12 NA NA NA NA NA NA NA NA NA
GP-12 ---8.5 ---8/31/2023 30,500 35,700 NA NA NA NA NA NA NA NA NA NA <5 <5 <12 <12 <12 <12 NA NA NA NA NA NA NA NA NA
3.52 90.92 4/17/2024 <125 <1,000 NA NA NA NA NA NA NA NA NA NA <5 <5 <12 <12 <12 <12 NA NA NA NA <12 NA NA NA NA
3.56 90.88 7/2/2024 <125 1,000 NA NA NA NA NA NA NA NA NA NA <8 <5 <12 <12 <12 <38 NA NA NA NA <12 NA NA NA NA
4.05 90.39 4/1/25 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
9.00 91.00 4/17/2024 <125 <1,000 NA NA NA NA NA NA NA NA NA NA <5 <5 <12 <12 <12 <12 NA NA NA NA <12 NA NA NA NA
9.06 90.94 7/2/2024 <125 <1,000 NA NA NA NA NA NA NA NA NA NA <8 <5 <12 <12 <12 <38 NA NA NA NA <12 NA NA NA NA
9.64 90.36 4/1/25 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
4.42 90.74 4/17/2024 339 1,600 NA NA NA NA NA NA NA NA NA NA <12 <5 <12 12 <12 <12 NA NA NA NA <12 NA NA NA NA
4.42 90.74 4/19/2024 NA NA <125 <125 <125 339 <10 176 3,090 108 573 <10 NA NA NA NA NA NA NA NA NA NA 12 NA NA NA NA
4.42 90.74 4/19/2024 NA NA <125 <125 <125 339 <10 176 3,090 108 573 <10 NA NA NA NA NA NA NA NA NA NA 12 NA NA NA NA
4.96 90.20 4/1/25 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
5.98 90.71 4/17/2024 <125 <1,000 NA NA NA NA NA NA NA NA NA NA <5 <5 <12 <12 <12 <12 NA NA NA NA <12 NA NA NA NA
5.98 90.71 4/19/2024 NA NA <125 <125 <125 <125 <10 73 130 22 356 <10 NA NA NA NA NA NA NA NA NA NA <12 NA NA NA NA
6.05 90.64 7/2/2024 <125 2,000 NA NA NA NA NA NA NA NA NA NA <8 <5 <12 <12 <12 <38 NA NA NA NA <12 NA NA NA NA
5.49 91.20 1/3/2025 459 1,300 NA NA NA NA NA NA NA NA NA NA <8 <5 <12 <12 <12 <38 NA NA NA NA <12 NA NA NA NA
6.51 90.18 4/1/25 <20.0 <1,000 NA NA NA NA NA NA NA NA NA NA <1 2 <2 <2 5 <6 NA NA NA NA <2 NA NA NA NA
8.60 90.52 4/17/2024 <125 <1,000 NA NA NA NA NA NA NA NA NA NA <5 <5 <12 <12 <12 <12 NA NA NA NA <12 NA NA NA NA
8.65 90.47 7/2/2024 153 3,700 NA NA NA NA NA NA NA NA NA NA <8 <5 <12 <12 <12 <38 NA NA NA NA <12 NA NA NA NA
9.66 89.46 1/3/2025 209 <1,000 NA NA NA NA NA NA NA NA NA NA <8 <5 <12 <12 <12 <38 NA NA NA NA <12 NA NA NA NA
9.06 90.06 4/1/24 <100 <1,000 NA NA NA NA NA NA NA NA NA NA <6 <4 <10 <10 <10 <30 NA NA NA NA <10 NA NA NA NA
8.72 90.76 4/17/2024 144 1,800 NA NA NA NA NA NA NA NA NA NA <5 <5 <12 <12 <12 <12 NA NA NA NA <12 NA NA NA NA
8.77 90.71 7/2/2024 1,370 59,400 <125 <125 734 613 <10 89 814 94 626 <10 <8 <5 <12 20 <12 <38 NA NA NA NA 20 NA NA NA NA
9.80 89.68 1/3/2025 710 1,100 <125 <125 569 140 <10 10,700 124 47 3,600 <10 <12 <5 <12 <12 <12 <38 NA NA NA NA <12 NA NA NA NA
9.22 90.26 4/1/24 <100 3,600 <100 <100 <100 <100 <1,000 <1,000 <1,000 <1,000 <1,000 <1,000 <6 <4 <10 <10 <10 <30 NA NA NA NA <10 NA NA NA NA
9.68 88.92 1/3/2025 <125 <1,000 NA NA NA NA NA NA NA NA NA NA <8 <5 <12 <12 <12 <38 NA NA NA NA <12 NA NA NA NA
8.86 89.74 4/1/25 <20.0 <1,000 NA NA NA NA NA NA NA NA NA NA <1 <0.8 <2 <2 <2 <6 NA NA NA NA <2 NA NA NA NA
9.45 88.97 1/3/2025 <125 <1,000 NA NA NA NA NA NA NA NA NA NA <8 <5 <12 <12 <12 <38 NA NA NA NA <12 NA NA NA NA
8.60 89.82 4/1/25 <20.0 <1,000 NA NA NA NA NA NA NA NA NA NA <1 <0.8 <2 <2 <2 <6 NA NA NA NA <2 NA NA NA NA
10.67 88.55 1/3/2025 <125 <1,000 NA NA NA NA NA NA NA NA NA NA <8 <5 <12 <12 <12 <38 NA NA NA NA <12 NA NA NA NA
9.67 89.55 4/1/25 <20.0 <1,000 NA NA NA NA NA NA NA NA NA NA <1 <0.8 <2 <2 <2 <6 NA NA NA NA <2 NA NA NA NA
---------------------------------------5 700 ---1,000 10,000 ------------------10 2,000 50
1,000 1,000 ------------------------------200 5 700 700 1,000 10,000 ------------700 ------------
------6,130 6,130 10,200 4,090 4,090 10,200 10,200 204,000 204,000 3,070 511 9.87 10,200 2,040 8,180 20,400 ------------2,040 ------------
NOTES:
< = Concentration was below the laboratory reporting limit.
U.S. EPA = United States Environmental Protection Agency.
--- = Not established or not applicable.
NA = Not analyzed.
DERR RBCA SSCL = Division or Environmental Response and Remediation Risk-Based Corrective Action Site-Specific Cleanup Level.
MW-11
MW-12
MW-13
98.60
98.42
99.22
100.00
94.44
99.12
96.69
95.16
MW-5
MW-6
MW-7
MW-8
MW-9
MW-10 99.48
= Measured concentration is greater than the calculated DERR RBCA SSCL for Groundwater Ingestion, no other exposure pathways exceeded the calcualted DERR RBCA SSCLs.
all concentrations are expressed in micrograms per liter (µg/L)
Semi-Volatile
Organic
Compounds
Volatile Organic CompoundsTPH-GRO Fractionation and TPH-DRO Fractionation
Only analytes detected above laboratory reporting limits in one or more sample are presented.
BOLD = Measured concentration is greater than the applicable U.S. EPA Federal Maximum Contaminant Level or the Utah Initial Screening Level where applicable.
U.S. EPA Maximum Contaminent Levels
Sample
I.D.
Sample
Collection
Date
Utah Initial Screening Level
DERR RBCA SSCL Groundwater Ingestion
Petroleum
Hydrocarbons
April 24, 2023 LSI
Additional LSI Activities
August 31, 2023 Additional LSI
Metals
Depth to
Groundwater
(feet)
Groundwater
Elevation
(feet)
Top-Of-Casing
Elevation (Feet)
Table 1
Groundwater Analytical Data
Wall Avenue Apartment Property
2534 South Wall Avenue
Ogden, Utah

Appendix A
Photolog

Photo 1. MW-11 boring location.Photo 2. MW-11 soil cores.
Photo 3. MW-12 boring locations.Photo 4. MW-12 soil cores.
Photo 5. MW-13 drilling location.Photo 6. MW-13 soil cores.
Photo 7. MW-11 surface completion.Photo 8. MW-12 surface completion.
Photo 9. Typical well development.Photo 10. Typical groundwater sampling.

Appendix B
Boring and Well Construction Logs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
DATE DRILLED: December 30, 2024
DESCRIPTION AND CLASSIFICATION
Description and Remarks Color
Soil
Type Consist.De
p
t
h

(
f
e
e
t
)
Sa
m
p
l
e
r
PI
D

(
p
p
m
)
Wat
e
r

L
e
v
e
l
WELL LOG
Environmental Science and Engineering
DEPTH TO GROUNDWATER: 10’
BORING NO.: MW-11
REFERENCE ELEVATION: Ground Surface
Well
Construction
4.0
TOTAL DEPTH: 20’
’
LOGGED BY: Ryan Panasy
DRILL RIG: Geoprobe 7822DT
Description and Remarks ColorDescription and Remarks
End of Boring
8” Flush Mount
Well Vault set in
Concrete
2” PVC
0.25’ to 6’
Hydrated
Medium
Bentonite
1’ to 6’
10/20
Silica Sand
6’-18’
3” PVC
Foot
0.01-Slot
2” PVC
Well Screen
8’ to 18’
2” J-Plug

Sandy Clay with Gravel (0-5’): medium plasticity, fine-grained
sand, fine angular to sub-rounded gravel, moist.
Medium
Stiff
CLBrown
Gravelly Sand (5-20’): Fine to coarse-grained sand, fine
angular to sub-rounded gravel, moist. Saturated at 10’.
Brown SW Medium
Dense
PROJECT NO.: 2737-001C
Former Super Sonic Car Wash
2534 South Wall Avenue
Ogden, Utah
2.0
0.0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
DATE DRILLED: December 30, 2024
DESCRIPTION AND CLASSIFICATION
Description and Remarks Color
Soil
Type Consist.De
p
t
h

(
f
e
e
t
)
Sa
m
p
l
e
r
PI
D

(
p
p
m
)
Wat
e
r

L
e
v
e
l
WELL LOG
Environmental Science and Engineering
DEPTH TO GROUNDWATER: 10’
BORING NO.: MW-12
REFERENCE ELEVATION: Ground Surface
Well
Construction
2.0
TOTAL DEPTH: 20’
’
LOGGED BY: Ryan Panasy
DRILL RIG: Geoprobe 7822DT
Description and Remarks ColorDescription and Remarks
End of Boring
8” Flush Mount
Well Vault set in
Concrete
2” PVC
0.25’ to 6’
Hydrated
Medium
Bentonite
1’ to 6’
10/20
Silica Sand
6’-18’
3” PVC
Foot
0.01-Slot
2” PVC
Well Screen
8’ to 18’
2” J-Plug

Sandy Clay with Gravel (0-5’): medium plasticity, fine-grained
sand, fine angular to sub-rounded gravel, moist.
Medium
Stiff
CLBrown
Gravelly Sand (5-15’): Fine to coarse-grained sand, fine
angular to sub-rounded gravel, moist. Saturated at 10’.
Brown SW Medium
Dense
PROJECT NO.: 2737-001C
Former Super Sonic Car Wash
2534 South Wall Avenue
Ogden, Utah
Silt with Gravel (15-20’): Low plasticity, fine rounded to
sub-rounded gravel, saturated.
Grey ML Medium
Stiff
1.0
0.0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
DATE DRILLED: December 30, 2024
DESCRIPTION AND CLASSIFICATION
Description and Remarks Color
Soil
Type Consist.De
p
t
h

(
f
e
e
t
)
Sa
m
p
l
e
r
PI
D

(
p
p
m
)
Wat
e
r

L
e
v
e
l
WELL LOG
Environmental Science and Engineering
DEPTH TO GROUNDWATER: 10’
BORING NO.: MW-13
REFERENCE ELEVATION: Ground Surface
Well
Construction
2.0
TOTAL DEPTH: 20’
’
LOGGED BY: Ryan Panasy
DRILL RIG: Geoprobe 7822DT
Description and Remarks ColorDescription and Remarks
End of Boring
8” Flush Mount
Well Vault set in
Concrete
2” PVC
0.25’ to 6’
Hydrated
Medium
Bentonite
1’ to 6’
10/20
Silica Sand
6’-18’
3” PVC
Foot
0.01-Slot
2” PVC
Well Screen
8’ to 18’
2” J-Plug

Sandy Clay with Gravel (0-5’): medium plasticity, fine-grained
sand, fine angular to sub-rounded gravel, moist.
Medium
Stiff
CLBrown
Gravelly Sand (5-20’): Fine to coarse-grained sand, fine
angular to sub-rounded gravel, moist. Saturated at 10’.
Brown SW Medium
Dense
PROJECT NO.: 2737-001C
Former Super Sonic Car Wash
2534 South Wall Avenue
Ogden, Utah
0.0

Appendix C
Laboratory Analytical Reports

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: Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
Work Order: 25A0165
Project: Wall Ave Ogden
1/13/2025
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 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
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001C
1/3/25 16:10 @ 6.2 °C
1/13/2025
Wall Ave Ogden
Sample ID: MW-8
Lab ID: 25A0165-01Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 1/3/25 14:05
Preparation
Date/Time
Sampled By: Ryan Panasy
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L 1/6/251/6/251.0 EPA 8015 C1.3Diesel Range Organics
MBTEXn
mg/L 1/7/251/7/250.005 EPA 8260D/5030BNDBenzene
mg/L 1/7/251/7/250.012 EPA 8260D/5030BNDEthylbenzene
mg/L 1/7/251/7/250.008 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 1/7/251/7/250.012 EPA 8260D/5030BNDNaphthalene
mg/L 1/7/251/7/250.012 EPA 8260D/5030BNDToluene
mg/L 1/7/251/7/250.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 1/7/251/7/250.125 EPA 8260B/C 5030A/[CALC]0.459Gasoline Range Organics
Project Name: Wall Ave Ogden CtF WO#: 25A0165
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
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001C
1/3/25 16:10 @ 6.2 °C
1/13/2025
Wall Ave Ogden
Sample ID: MW-9
Lab ID: 25A0165-02Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 1/3/25 11:55
Preparation
Date/Time
Sampled By: Ryan Panasy
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L 1/6/251/6/251.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 1/7/251/7/250.005 EPA 8260D/5030BNDBenzene
mg/L 1/7/251/7/250.012 EPA 8260D/5030BNDEthylbenzene
mg/L 1/7/251/7/250.008 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 1/7/251/7/250.012 EPA 8260D/5030BNDNaphthalene
mg/L 1/7/251/7/250.012 EPA 8260D/5030BNDToluene
mg/L 1/7/251/7/250.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 1/7/251/7/250.125 EPA 8260B/C 5030A/[CALC]0.209Gasoline Range Organics
Project Name: Wall Ave Ogden CtF WO#: 25A0165
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
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001C
1/3/25 16:10 @ 6.2 °C
1/13/2025
Wall Ave Ogden
Sample ID: MW-10
Lab ID: 25A0165-03Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 1/3/25 14:35
Preparation
Date/Time
Sampled By: Ryan Panasy
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L 1/6/251/6/251.0 EPA 8015 C1.1Diesel Range Organics
BETX Compounds
mg/L 1/7/251/7/250.125 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 1/7/251/7/250.125 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 1/7/251/7/250.125 EPA 8260D/5030B0.569C9-C10 Aliphatic hydrocarbons
mg/L 1/7/251/7/250.125 EPA 8260D/5030B0.140C9-C10 Alkyl Benzenes
mg/L 1/7/251/7/250.005 EPA 8260D/5030BNDBenzene
mg/L 1/7/251/7/250.012 EPA 8260D/5030BNDEthylbenzene
mg/L 1/7/251/7/250.012 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 1/7/251/7/250.012 EPA 8260D/5030BNDNaphthalene
mg/L 1/7/251/7/250.012 EPA 8260D/5030BNDToluene
mg/L 1/7/251/7/250.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 1/7/251/7/250.125 EPA 8260B/C 5030A/[CALC]0.710Gasoline Range Organics
Semi-Volatile Compounds
ug/L 1/8/251/8/2510EPA 8270E/351110700C11-12 Aliphatic hydrocarbons
ug/L 1/8/251/8/2510EPA 8270E/3511124C13-C16 Aliphatic hydrocarbons
ug/L 1/8/251/8/2510EPA 8270E/351147C17-C21 Aliphatic hydrocarbons
ug/L 1/8/251/8/2510EPA 8270E/35113600C22-C35 Aliphatic hydrocarbons
ug/L 1/8/251/8/2510EPA 8270E/3511NDC11-C13 Alkyl Naphthalenes
ug/L 1/8/251/8/2510EPA 8270E/3511NDTotal C12-C22 PAH
ug/L 1/8/251/8/2510EPA 8270E/3511NDAcenaphthene
ug/L 1/8/251/8/2510EPA 8270E/3511NDAcenaphthylene
ug/L 1/8/251/8/2510EPA 8270E/3511NDAnthracene
ug/L 1/8/251/8/2510EPA 8270E/3511NDBenzo (a) anthracene
ug/L 1/8/251/8/2510EPA 8270E/3511NDBenzo (a) pyrene
ug/L 1/8/251/8/2510EPA 8270E/3511NDBenzo (b) fluoranthene
ug/L 1/8/251/8/2510EPA 8270E/3511NDBenzo (g,h,i) perylene
ug/L 1/8/251/8/2510EPA 8270E/3511NDBenzo (k) fluoranthene
ug/L 1/8/251/8/2510EPA 8270E/3511NDChrysene
ug/L 1/8/251/8/2510EPA 8270E/3511NDDibenzo (a,h) anthracene
ug/L 1/8/251/8/2510EPA 8270E/3511NDFluoranthene
ug/L 1/8/251/8/2510EPA 8270E/3511NDFluorene
ug/L 1/8/251/8/2510EPA 8270E/3511NDIndeno (1,2,3-cd) pyrene
ug/L 1/8/251/8/2510EPA 8270E/3511NDPhenanthrene
ug/L 1/8/251/8/2510EPA 8270E/3511NDPyrene
Project Name: Wall Ave Ogden CtF WO#: 25A0165
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
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001C
1/3/25 16:10 @ 6.2 °C
1/13/2025
Wall Ave Ogden
Sample ID: MW-11
Lab ID: 25A0165-04Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 1/3/25 13:00
Preparation
Date/Time
Sampled By: Ryan Panasy
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L 1/6/251/6/251.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 1/6/251/6/250.005 EPA 8260D/5030BNDBenzene
mg/L 1/6/251/6/250.012 EPA 8260D/5030BNDEthylbenzene
mg/L 1/6/251/6/250.008 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 1/6/251/6/250.012 EPA 8260D/5030BNDNaphthalene
mg/L 1/6/251/6/250.012 EPA 8260D/5030BNDToluene
mg/L 1/6/251/6/250.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 1/6/251/6/250.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: Wall Ave Ogden CtF WO#: 25A0165
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
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001C
1/3/25 16:10 @ 6.2 °C
1/13/2025
Wall Ave Ogden
Sample ID: MW-12
Lab ID: 25A0165-05Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 1/3/25 12:35
Preparation
Date/Time
Sampled By: Ryan Panasy
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L 1/6/251/6/251.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 1/6/251/6/250.005 EPA 8260D/5030BNDBenzene
mg/L 1/6/251/6/250.012 EPA 8260D/5030BNDEthylbenzene
mg/L 1/6/251/6/250.008 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 1/6/251/6/250.012 EPA 8260D/5030BNDNaphthalene
mg/L 1/6/251/6/250.012 EPA 8260D/5030BNDToluene
mg/L 1/6/251/6/250.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 1/6/251/6/250.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: Wall Ave Ogden CtF WO#: 25A0165
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
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001C
1/3/25 16:10 @ 6.2 °C
1/13/2025
Wall Ave Ogden
Sample ID: MW-13
Lab ID: 25A0165-06Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 1/3/25 13:25
Preparation
Date/Time
Sampled By: Ryan Panasy
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L 1/6/251/6/251.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 1/6/251/6/250.005 EPA 8260D/5030BNDBenzene
mg/L 1/6/251/6/250.012 EPA 8260D/5030BNDEthylbenzene
mg/L 1/6/251/6/250.008 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 1/6/251/6/250.012 EPA 8260D/5030BNDNaphthalene
mg/L 1/6/251/6/250.012 EPA 8260D/5030BNDToluene
mg/L 1/6/251/6/250.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 1/6/251/6/250.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: Wall Ave Ogden CtF WO#: 25A0165
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
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001C
1/3/25 16:10 @ 6.2 °C
1/13/2025
Wall Ave Ogden
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
S-BN = Base/Neutral surrogate recovery outside of control limits. The data was accepted based on valid recovery of remaining two base/neutral surrogates.
Project Name: Wall Ave Ogden CtF WO#: 25A0165
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
Wasatch Environmental
Attn: Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
Work Order: 25D0136
Project: Wall Avenue Property
4/23/2025
Amended
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 11
Wasatch Environmental
2410 West California Avenue
Salt Lake City, UT 84104
Project: Wall Avenue Property
Project Manager: Blake Downey
Laboratory ID Sample Name
25D0136-01 MW-8
25D0136-02 MW-9
25D0136-03 MW-10
25D0136-04 MW-11
25D0136-05 MW-12
25D0136-06 MW-13
Amended Report Narrative

Report Changes: DRO has been reported on 25D0136-02.
www.ChemtechFord.com
Project Name: Wall Avenue Property CtF WO#: 25D0136
Page 2 of 11
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
Amended Amended
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001C
4/2/25 8:08 @ 0.4 °C
4/23/2025
Wall Avenue Property
Sample ID: MW-8
Lab ID: 25D0136-01Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/1/25 8:30
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L 4/3/254/3/251.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 4/2/254/2/250.0008 EPA 8260D/5030B0.002Benzene
mg/L 4/2/254/2/250.002 EPA 8260D/5030BNDEthylbenzene
mg/L 4/2/254/2/250.001 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 4/2/254/2/250.002 EPA 8260D/5030BNDNaphthalene
mg/L 4/2/254/2/250.002 EPA 8260D/5030B0.005Toluene
mg/L 4/2/254/2/250.006 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 4/2/254/2/250.0200 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: Wall Avenue Property CtF WO#: 25D0136
www.ChemtechFord.com
Page 3 of 11Page 3 of 11
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
Amended Amended
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001C
4/2/25 8:08 @ 0.4 °C
4/23/2025
Wall Avenue Property
Sample ID: MW-9
Lab ID: 25D0136-02Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/1/25 9:10
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L ISTD-014/3/254/3/251.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 4/2/254/2/250.004 EPA 8260D/5030BNDBenzene
mg/L 4/2/254/2/250.010 EPA 8260D/5030BNDEthylbenzene
mg/L 4/2/254/2/250.006 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 4/2/254/2/250.010 EPA 8260D/5030BNDNaphthalene
mg/L 4/2/254/2/250.010 EPA 8260D/5030BNDToluene
mg/L 4/2/254/2/250.030 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 4/2/254/2/250.100 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: Wall Avenue Property CtF WO#: 25D0136
www.ChemtechFord.com
Page 4 of 11Page 4 of 11
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
Amended Amended
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001C
4/2/25 8:08 @ 0.4 °C
4/23/2025
Wall Avenue Property
Sample ID: MW-10
Lab ID: 25D0136-03Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/1/25 9:30
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L 4/7/254/7/251.0 EPA 8015 C3.6Diesel Range Organics
BETX Compounds
mg/L 4/2/254/2/250.100 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 4/2/254/2/250.100 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 4/2/254/2/250.100 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 4/2/254/2/250.100 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
MBTEXn
mg/L 4/2/254/2/250.004 EPA 8260D/5030BNDBenzene
mg/L 4/2/254/2/250.010 EPA 8260D/5030BNDEthylbenzene
mg/L 4/2/254/2/250.006 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 4/2/254/2/250.010 EPA 8260D/5030BNDNaphthalene
mg/L 4/2/254/2/250.010 EPA 8260D/5030BNDToluene
mg/L 4/2/254/2/250.030 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 4/2/254/2/250.100 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Semi-Volatile Compounds
mg/L 4/8/254/3/251EPA 8270E/3511NDC11-12 Aliphatic hydrocarbons
mg/L 4/8/254/3/251EPA 8270E/3511NDC13-C16 Aliphatic hydrocarbons
mg/L 4/8/254/3/251EPA 8270E/3511NDC17-C21 Aliphatic hydrocarbons
mg/L 4/8/254/3/251EPA 8270E/3511NDC22-C35 Aliphatic hydrocarbons
mg/L 4/8/254/3/251EPA 8270E/3511NDC11-C13 Alkyl Naphthalenes
mg/L 4/8/254/3/251EPA 8270E/3511NDTotal C12-C22 PAH
ug/L 4/8/254/3/2510EPA 8270E/3511ND2-Methylnaphthalene
ug/L 4/8/254/3/2510EPA 8270E/3511NDAcenaphthene
ug/L 4/8/254/3/2510EPA 8270E/3511NDAcenaphthylene
ug/L 4/8/254/3/2510EPA 8270E/3511NDAnthracene
ug/L 4/8/254/3/2510EPA 8270E/3511NDBenzo (a) anthracene
ug/L 4/8/254/3/2510EPA 8270E/3511NDBenzo (a) pyrene
ug/L 4/8/254/3/2510EPA 8270E/3511NDBenzo (b) fluoranthene
ug/L 4/8/254/3/2510EPA 8270E/3511NDBenzo (g,h,i) perylene
ug/L 4/8/254/3/2510EPA 8270E/3511NDBenzo (k) fluoranthene
ug/L 4/8/254/3/2510EPA 8270E/3511NDCarbazole
ug/L 4/8/254/3/2510EPA 8270E/3511NDChrysene
ug/L 4/8/254/3/2510EPA 8270E/3511NDDibenz (a,h) anthracene
ug/L 4/8/254/3/2510EPA 8270E/3511NDDibenzofuran
ug/L 4/8/254/3/2510EPA 8270E/3511NDFluoranthene
ug/L 4/8/254/3/2510EPA 8270E/3511NDFluorene
Project Name: Wall Avenue Property CtF WO#: 25D0136
www.ChemtechFord.com
Page 5 of 11Page 5 of 11
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
Amended Amended
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001C
4/2/25 8:08 @ 0.4 °C
4/23/2025
Wall Avenue Property
Sample ID: MW-10 (cont.)
Lab ID: 25D0136-03Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/1/25 9:30
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Semi-Volatile Compounds (cont.)
ug/L 4/8/254/3/2510EPA 8270E/3511NDIndeno (1,2,3-cd) pyrene
ug/L 4/8/254/3/2510EPA 8270E/3511NDNaphthalene
ug/L 4/8/254/3/2510EPA 8270E/3511NDNitrobenzene
ug/L 4/8/254/3/2510EPA 8270E/3511NDPhenanthrene
ug/L 4/8/254/3/2510EPA 8270E/3511NDPyrene
Project Name: Wall Avenue Property CtF WO#: 25D0136
www.ChemtechFord.com
Page 6 of 11Page 6 of 11
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
Amended Amended
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001C
4/2/25 8:08 @ 0.4 °C
4/23/2025
Wall Avenue Property
Sample ID: MW-11
Lab ID: 25D0136-04Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/1/25 10:00
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L 4/3/254/3/251.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 4/2/254/2/250.0008 EPA 8260D/5030BNDBenzene
mg/L 4/2/254/2/250.002 EPA 8260D/5030BNDEthylbenzene
mg/L 4/2/254/2/250.001 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 4/2/254/2/250.002 EPA 8260D/5030BNDNaphthalene
mg/L 4/2/254/2/250.002 EPA 8260D/5030BNDToluene
mg/L 4/2/254/2/250.006 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 4/2/254/2/250.0200 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: Wall Avenue Property CtF WO#: 25D0136
www.ChemtechFord.com
Page 7 of 11Page 7 of 11
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
Amended Amended
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001C
4/2/25 8:08 @ 0.4 °C
4/23/2025
Wall Avenue Property
Sample ID: MW-12
Lab ID: 25D0136-05Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/1/25 10:20
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L 4/3/254/3/251.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 4/2/254/2/250.0008 EPA 8260D/5030BNDBenzene
mg/L 4/2/254/2/250.002 EPA 8260D/5030BNDEthylbenzene
mg/L 4/2/254/2/250.001 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 4/2/254/2/250.002 EPA 8260D/5030BNDNaphthalene
mg/L 4/2/254/2/250.002 EPA 8260D/5030BNDToluene
mg/L 4/2/254/2/250.006 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 4/2/254/2/250.0200 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: Wall Avenue Property CtF WO#: 25D0136
www.ChemtechFord.com
Page 8 of 11Page 8 of 11
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
Amended Amended
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001C
4/2/25 8:08 @ 0.4 °C
4/23/2025
Wall Avenue Property
Sample ID: MW-13
Lab ID: 25D0136-06Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/1/25 10:50
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L 4/3/254/3/251.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 4/2/254/2/250.0008 EPA 8260D/5030BNDBenzene
mg/L 4/2/254/2/250.002 EPA 8260D/5030BNDEthylbenzene
mg/L 4/2/254/2/250.001 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 4/2/254/2/250.002 EPA 8260D/5030BNDNaphthalene
mg/L 4/2/254/2/250.002 EPA 8260D/5030BNDToluene
mg/L 4/2/254/2/250.006 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 4/2/254/2/250.0200 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: Wall Avenue Property CtF WO#: 25D0136
www.ChemtechFord.com
Page 9 of 11Page 9 of 11
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
Amended Amended
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001C
4/2/25 8:08 @ 0.4 °C
4/23/2025
Wall Avenue Property
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
ISTD-01 = Re-analysis confirms failing internal standard due to matrix interference.
S-04 = The surrogate recovery for this sample is outside of established control limits due to a sample matrix effect .
Project Name: Wall Avenue Property CtF WO#: 25D0136
www.ChemtechFord.com
Page 10 of 11Page 10 of 11
Page 11 of 11

Appendix D
DERR RBCA SSCL Calculator Documents

Page 1 of 3
SSCL Calculator Prepared for:SSCL Calculator Prepared by:
Site name:
Site address:
Facility ID:
Release ID:
Contact name:
Contact phone:
Contact e-mail:
Site-Specific Cleanup Levels* for Residential/ Unknown Receptors
Air Groundwater Soil
SSCLair SSCLwing SSCLwesp SSCLwamb SSCLs-leach SSCLsesp SSCLsamb SSCLss
(See Eq. D.1)(See Eq. D.2)(See Eq. D.3)(See Eq. D.4)(See Eq. D.5)(See Eq. D.6)(See Eq. D.7)(See Eq. D.8)
Air Groundwater Groundwater Groundwater Subsurface soil Subsurface soil Subsurface soil Surface Soil
Inhalation Ingestion Indoor air
(enclosed space)
vapor inhalation
Outdoor air
(ambient) vapor
inhalation
Leaching to
groundwater
(groundwater
ingestion)
Indoor air
(enclosed space)
vapor inhalation
Outdoor air
(ambient) vapor
inhalation
Ingestion of soil,
inhalation of
vapors and
particles, and
dermal contact
µg/m3 air µg/m3 air mg/L water mg/L water mg/L water mg/L water mg/kg soil mg/kg soil mg/kg soil mg/kg soil mg/kg soil
Benzene (71-43-2)c 4.93E-01 9.87E-03 7.20E-01 3.32E+02 0.005 Non-Detect Everywhere
(highest lab RL)1.90E-01 3.59E-03 2.76E-01 6.05E+00 0.008 All Detecdtions Below ISLs
Toluene (108-88-3)nc 7.31E+03 8.18E+00 1.20E+04 5.60E+06 0.012 Non-Detect Everywhere
(highest lab RL)2.53E+02 7.21E+01 5.54E+03 5.42E+03 0.03 GP-5 (14')
Ethylbenzene (100-41-4)nc 1.48E+03 1.02E+01 2.68E+03 1.25E+06 0.012 Non-Detect Everywhere
(highest lab RL)5.50E+02 2.22E+01 1.71E+03 6.61E+03 0.007 GP-2 (14')
Xylenes (1330-20-7)nc 1.48E+02 2.04E+01 2.38E+02 1.10E+05 0.012 Non-Detect Everywhere
(highest lab RL)1.11E+03 3.06E+00 2.35E+02 8.49E+03 0.03 GP-5 (14')
Naphthalene (91-20-3)nc 4.39E+00 2.04E+00 1.24E+01 4.17E+03 0.02 MW-10 1.36E+02 2.12E+00 1.63E+02 6.28E+02 5.92 GP-3 (14')
MTBE (1634-04-04)nc 4.38E+03 5.11E-01 2.98E+03 4.78E+05 0.005 Non-Detect Everywhere
(highest lab RL)4.85E+00 1.63E+02 1.26E+04 3.40E+02 0.003 Non-Detect Everywhere
Alkyl benzenes (C9-C10)
[average values]nc 3.07E+02 4.09E+00 5.76E+02 2.69E+05 5.65 GP-2 4.29E+02 9.55E+00 7.35E+02 2.57E+03 108 GP-3(14')
Alkyl naphthalenes (C11-C13)
[average values]nc 3.07E+02 4.09E+00 8.34E+02 2.83E+05 0.01 Non-Detect Everywhere
(highest lab RL)2.01E+03 1.02E+03 7.87E+04 1.45E+04 4.73 Non-Detect Everywhere
Total PAHs (C12-C22)
[average values]nc 1.53E+02 3.07E+00 1.39E+02 6.15E+04 0.01 Non-Detect Everywhere
(highest lab RL)1.33E+04 3.73E+02 2.87E+04 9.39E+03 4.8 GP-3(14')
Aliphatics (C5-C6)
[Hexane (110-54-3)]nc 3.07E+02 6.13E+00 5.08E+02 2.41E+05 0.125 Non-Detect Everywhere
(highest lab RL)6.60E+03 7.03E-01 5.40E+01 3.76E+03 2.96 Non-Detect Everywhere
(highest lab RL)
Aliphatics (C7-C8)
[Heptane (142-82-5)]nc 3.07E+02 6.13E+00 6.14E+02 2.92E+05 0.125 Non Detect Everywhere 1.32E+04 9.57E-01 7.36E+01 3.76E+03 3 Non-Detect Everywhere
(highest lab RL)
Aliphatics (C9-C10)
[Nonane (111-84-2)]nc 1.48E+03 1.02E+01 3.47E+03 1.65E+06 11.7 GP-2 6.31E+04 6.64E+00 5.11E+02 6.61E+03 79.1 GP-3(14')
Aliphatics (C11-C12)
[Undecane (1120-21-4)]nc 1.48E+03 1.02E+01 3.94E+03 1.87E+06 0.447 GP-2 2.62E+05 3.87E+01 2.97E+03 6.61E+03 874 GP-3(14')
Aliphatics (C13-C16)
[Hexadecane (544-76-3)]nc 1.48E+03 1.02E+01 4.55E+03 2.16E+06 3.090 MW-7 3.54E+06 6.08E+02 4.68E+04 6.61E+03 46.2 GP-3(14')
Aliphatics (C17-C21)
[Heptadecane (629-78-7)]nc 1.02E+04 2.04E+02 3.75E+04 1.78E+07 0.289 GP-2 5.60E+09 5.81E+05 4.47E+07 1.32E+05 38.5 GP-3(14')
Aliphatics (C22-C35)
[Heptadecane (629-78-7)]nc 1.02E+04 2.04E+02 3.75E+04 1.78E+07 0.733 GP-2 5.60E+09 5.81E+05 4.47E+07 1.32E+05 803 GP-3(14')
435-760-8269
[e-mail]
Blake Downey
C-0268
Wasatch Environmental
435-760-8269
[e-mail]
Date prepared:9/26/2023
Proposed Wall Avenue Property
2534 South Wall Ave., Ogden, Utah
1200607
MJG
Blake Downey
Soil
Comments
(e.g. Sample ID,
Sample Depth,
Sample Date, etc.)
Highest
Soil
Concentrations
Remaining at the
Site
Name:
Company, Agency, other:
Phone:
E-mail:
UST Consultant Cert. #:
Highest
Air
Concentrations
Remaining at the
Site
Air
Comments
(e.g. Sample ID,
Sample Date, etc.)
Groundwater Comments
(e.g. Sample ID,
Sample Date, etc.)Chemical Name (CAS #)
Pr
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Highest
Groundwater
Concentrations
Remaining at the
Site
DERRsRBCASSCCalculatorv - Revised 7-19-24 Page 1 of 3
5/1/2025
9:55 AM
Page 2 of 3
Site-Specific Cleanup Levels* for Residential/ Unknown Receptors
Air Groundwater Soil
SSCLair SSCLwing SSCLwesp SSCLwamb SSCLs-leach SSCLsesp SSCLsamb SSCLss
(See Eq. D.1)(See Eq. D.2)(See Eq. D.3)(See Eq. D.4)(See Eq. D.5)(See Eq. D.6)(See Eq. D.7)(See Eq. D.8)
Air Groundwater Groundwater Groundwater Subsurface soil Subsurface soil Subsurface soil Surface Soil
Inhalation Ingestion Indoor air
(enclosed space)
vapor inhalation
Outdoor air
(ambient) vapor
inhalation
Leaching to
groundwater
(groundwater
ingestion)
Indoor air
(enclosed space)
vapor inhalation
Outdoor air
(ambient) vapor
inhalation
Ingestion of soil,
inhalation of
vapors and
particles, and
dermal contact
µg/m3 air µg/m3 air mg/L water mg/L water mg/L water mg/L water mg/kg soil mg/kg soil mg/kg soil mg/kg soil mg/kg soil
Soil
Comments
(e.g. Sample ID,
Sample Depth,
Sample Date, etc.)
Highest
Soil
Concentrations
Remaining at the
Site
Highest
Air
Concentrations
Remaining at the
Site
Air
Comments
(e.g. Sample ID,
Sample Date, etc.)
Groundwater Comments
(e.g. Sample ID,
Sample Date, etc.)Chemical Name (CAS #)

Highest
Groundwater
Concentrations
Remaining at the
Site
Acenaphthylene (208-96-8)nc 1.53E+02 3.07E+00 1.32E+03 2.10E+05 0.01 Non Detect Everywhere -
Lab RL 6.07E+02 1.52E+03 1.17E+05 9.96E+03 9.47 Non-Detect - Lab RL at GP-3
(14')
Acenaphthene (83-32-9)nc 8.69E+01 6.13E+00 5.83E+02 1.06E+05 0.01 Non Detect Everywhere -
Lab RL 1.05E+03 5.38E+02 4.14E+04 9.30E+03 9.47 Non-Detect - Lab RL at GP-3
(14')
Fluorene (86-73-7)nc 5.62E+01 4.09E+00 5.95E+02 8.34E+04 0.01 Non Detect Everywhere -
Lab RL 1.13E+03 1.01E+03 7.75E+04 8.18E+03 9.47 Non-Detect - Lab RL at GP-3
(14')
Phenanthrene (85-01-8)nc 1.53E+02 3.07E+00 3.87E+03 3.99E+05 0.01 Non Detect Everywhere -
Lab RL 1.73E+03 1.50E+04 1.15E+06 1.33E+04 0.31 GP-5 (14')
Anthracene (120-12-7)nc 4.38E+02 3.07E+01 9.34E+03 1.00E+06 0.01 Non Detect Everywhere -
Lab RL 1.64E+04 3.37E+04 2.59E+06 9.11E+04 9.47 Non-Detect - Lab RL at GP-3
(14')
Fluoranthene (206-44-0)nc 5.83E+01 4.09E+00 4.78E+03 4.02E+05 0.01 Non Detect Everywhere -
Lab RL 7.82E+03 6.55E+04 5.04E+06 1.76E+04 0.12 GP-5 (14')
Pyrene (129-00-0)nc 4.38E+01 3.07E+00 4.46E+03 3.61E+05 0.01 Non Detect Everywhere -
Lab RL 5.42E+03 5.69E+04 4.38E+06 1.34E+04 9.47 Non-Detect - Lab RL at GP-3
(14')
Benz(a)Anthracene (56-55-3)c 1.96E-01 3.92E-04 1.67E+01 1.35E+03 0.01 Non Detect Everywhere -
Lab RL 2.74E+00 8.45E+02 6.50E+04 2.00E+00 9.47 Non-Detect - Lab RL at GP-3
(14')
Chrysene (218-01-09)c 1.96E+00 3.92E-02 4.37E+02 3.39E+04 0.01 Non Detect Everywhere -
Lab RL 2.19E+02 1.78E+04 1.37E+06 1.97E+02 9.47 Non-Detect - Lab RL at GP-3
(14')
Benzo(b)Fluoranthene (205-99-2)c 1.96E-02 3.92E-04 1.10E+00 1.00E+02 0.01 Non Detect Everywhere -
Lab RL 2.23E+00 4.39E+01 3.38E+03 1.94E+00 9.47 Non-Detect - Lab RL at GP-3
(14')
Benzo(k)-Fluoranthene (207-08-09)c 1.96E-01 3.92E-03 7.27E+02 5.36E+04 0.01 Non Detect Everywhere -
Lab RL 3.25E+01 4.43E+04 3.41E+06 2.00E+01 9.47 Non-Detect - Lab RL at GP-3
(14')
Benzo(a)-Pyrene (50-32-8)c 2.35E-03 3.92E-05 2.37E+00 1.76E+02 0.01 Non Detect Everywhere -
Lab RL 3.52E-01 1.56E+02 1.20E+04 2.00E-01 9.47 Non-Detect - Lab RL at GP-3
(14')
Indeno(1, 2, 3-Cd)Pyrene (193-39-
5)c 2.35E-02 3.92E-04 1.37E+03 1.84E+04 0.01 Non Detect Everywhere -
Lab RL 2.18E-01 5.56E+03 7.83E+04 2.00E+00 9.47 Non-Detect - Lab RL at GP-3
(14')
Dibenzo-(a, h)Anthracene (53-70-
3)c 2.35E-02 3.92E-04 5.46E+01 4.04E+03 0.01 Non Detect Everywhere -
Lab RL 1.99E+01 2.04E+04 1.57E+06 2.01E+00 9.47 Non-Detect - Lab RL at GP-3
(14')
Benzo (g, h, i)-Perylene (191-24-2)nc 1.53E+02 3.07E+00 9.70E+04 7.28E+06 0.01 Non Detect Everywhere -
Lab RL 6.54E+04 1.52E+07 1.17E+09 1.56E+04 9.47 Non-Detect - Lab RL at GP-3
(14')
Not used c Not used Not used Not used Not used Not used Not used Not used Not used
Not used c Not used Not used Not used Not used Not used Not used Not used Not used
Not used c Not used Not used Not used Not used Not used Not used Not used Not used
Not used c Not used Not used Not used Not used Not used Not used Not used Not used
Not used c Not used Not used Not used Not used Not used Not used Not used Not used
Not used c Not used Not used Not used Not used Not used Not used Not used Not usedAd
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DERRsRBCASSCCalculatorv - Revised 7-19-24 Page 2 of 3
5/1/2025
9:55 AM
Page 3 of 3
Site-Specific Cleanup Levels* for Residential/ Unknown Receptors
Air Groundwater Soil
SSCLair SSCLwing SSCLwesp SSCLwamb SSCLs-leach SSCLsesp SSCLsamb SSCLss
(See Eq. D.1)(See Eq. D.2)(See Eq. D.3)(See Eq. D.4)(See Eq. D.5)(See Eq. D.6)(See Eq. D.7)(See Eq. D.8)
Air Groundwater Groundwater Groundwater Subsurface soil Subsurface soil Subsurface soil Surface Soil
Inhalation Ingestion Indoor air
(enclosed space)
vapor inhalation
Outdoor air
(ambient) vapor
inhalation
Leaching to
groundwater
(groundwater
ingestion)
Indoor air
(enclosed space)
vapor inhalation
Outdoor air
(ambient) vapor
inhalation
Ingestion of soil,
inhalation of
vapors and
particles, and
dermal contact
µg/m3 air µg/m3 air mg/L water mg/L water mg/L water mg/L water mg/kg soil mg/kg soil mg/kg soil mg/kg soil mg/kg soil
Soil
Comments
(e.g. Sample ID,
Sample Depth,
Sample Date, etc.)
Highest
Soil
Concentrations
Remaining at the
Site
Highest
Air
Concentrations
Remaining at the
Site
Air
Comments
(e.g. Sample ID,
Sample Date, etc.)
Groundwater Comments
(e.g. Sample ID,
Sample Date, etc.)Chemical Name (CAS #)

Highest
Groundwater
Concentrations
Remaining at the
Site
Not used nc Not used Not used Not used Not used Not used Not used Not used Not used
Not used nc Not used Not used Not used Not used Not used Not used Not used Not used
Not used nc Not used Not used Not used Not used Not used Not used Not used Not used
Not used nc Not used Not used Not used Not used Not used Not used Not used Not used
Not used nc Not used Not used Not used Not used Not used Not used Not used Not used
Not used nc Not used Not used Not used Not used Not used Not used Not used Not used
* - Site-Specific Cleanup Levels assume a Natural Attenuation Factor of 1 (i.e. no natural attenuation). c - carcinogen; nc - non-carcinogen
Site-specific Parameters used in Calculations
Parameter Comments
Soil
Receptor
i
Lgw
Ls
Pavement
Precip.
Soil Zone
W
inches/year
Not applicable
ft
Units
Not applicable
Not applicable
ft-vertical/ft-lateral
ft
Not applicable
ft
19.5
Yes
45
Value
Silty sand
Residential/ Unknown
0.008
11
9.5
PAVED: contamination beneath
pavement
Depth to groundwater
Hydraulic gradient
Select the most sensitive Receptor that is present at the site
Soil type representative of site
Description
Width of contaminated source area parallel to groundwater flow or wind direction
Annual precipitation
Is contamination present in the saturated zone?
Is contamination beneath pavement or bare soils?
Depth to contaminated soil
Ad
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DERRsRBCASSCCalculatorv - Revised 7-19-24 Page 3 of 3
5/1/2025
9:55 AM

Appendix E
Groundwater Sampling Forms