DERR-2024-010153

2410 WEST CALIFORNIA AVENUE • SALT LAKE CITY, UTAH 84104
PHONE [phone]
Website: www.wasatch-environmental.com • e-Mail: [e-mail]
Mr. Damen Burnham August 05, 2024
Redevelopment Manager Project No.: 2737-001B
Ogden City Redevelopment Agency
2549 Washington Boulevard, Suite 420
Ogden, Utah 84401

SUBJECT: Additional Subsurface Investigation
Proposed Wall Avenue Apartments
2534 South Wall Avenue
Ogden, Utah
Underground Storage Tank Facility I.D.: 1200607
Release Site.: MJG

1. INTRODUCTION

Wasatch Environmental, Inc., (Wasatch) has completed additional subsurface investigation (SI) 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 investigation activities consisted of advancing eight
borings at the Site to facilitate the collection and analysis of soil samples; and the installation,
development, surveying, and sampling of six groundwater monitoring wells.

2. SITE DESCRIPTION

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 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 co nsists of grass
and weeds.

The Site is bordered on the north by the Royal Hotel and 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.

Underground utilities in the vicinity of the former tank include buried electrical and storm water lines
extending through the adjacent parking lot to the east. There are no water right points of diversion on the
Site.

3. SITE BACKGROUND

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

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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, 1975, 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
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 TPH-GRO 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

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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
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 ISL.

The excavated material was temporarily stockpiled west of the excavation and has been 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 manif ests, 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 are 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 TPH-DRO 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 excava tion
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.

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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
(Certification Number GS1083) in general accordance with the sampling protocol as set by Utah State
and the Environmental Protection 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 above the laboratory
method detection limits in the nine soil samples. The detected concentrations of TPH-DRO, TPH-GRO,
and naphthalene were all below the 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.

4. OBJECTIVE

The Site is planned for redevelopment and residential use; therefore, the objective of these activities is to
facilitate the regulatory closure of release MJG to support the proposed residential use of the Site.

5. FIELD METHODOLOGY

See Appendix A for a photolog of the field activities.

5.1 Soil Sampling

From April 9 through April 10, 2024, Wasatch Staff Geologist, Mr. Jake Scott P.G., directed the
completion of eight borings (designated GP-13 and GP-14, and MW-5 through MW-10), using direct-push
drilling techniques, to evaluate soil and groundwater conditions at the Site. Direct Push Services (DPS),
the drilling subcontractor, advanced the borings using a GeoProbe Model 7822 DT, track -mounted, direct-
push drill rig. At least 48 hours prior to starting the borings, a Blue Stakes of Utah utility locate was
completed. The boring locations are shown in Figure 2.

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Soil borings GP-13 and GP-14 were advanced to a depth of 25 feet bgs, and borings MW-5 through MW-
10 were advanced to a depth of 20 feet bgs. Soil samples from the borings were collected using 5-foot
long, by 1.5-inch diameter, discrete interval push samplers equipped with disposable polybutyrate liners.
The soil cores were field logged by an experienced geologist. The field logging included a description of
color, consistency, odor, staining, and soil type based on the Unified Soil Classification System. The soil
cores were screened in the field using a MiniRae 3000, ppm range photoionization detector (PID)
equipped with a 10.6 electron volt lamp. The PID was calibrated with a 100-ppm isobutylene standard
calibration gas. The PID is utilized to identify soils which may have been impacted by volatile organic
compounds (VOCs) such as those found in petroleum fuels and some solvents. One soil sample was
collected from each of the borings.

The soil samples collected from borings MW-5, MW-6, MW-9, and MW-10 were collected at the depth
interval exhibiting the highest degree of impacts based on field observations of soil staining, elevated PID
readings, or odors. If no impacts were observed, these soil samples were collected just above the
saturation zone and vadose zone interface. These samples were collected to further evaluate the lateral
extent of the petroleum hydrocarbon impacts at the Site.

The soil samples collected from borings MW-7, MW-8, GP-13, and GP-14 were collected from the depth
below all observed impacts based on field observations of soil staining, elevated PID readings, or odors in
an attempt to define the vertical petroleum hydrocarbon impact to soil.

Soil samples collected for analysis of TPH-GRO and MBTEXN were collected using U.S. EPA Method
5035A, using a disposable sampling device provided by the laboratory specifically for use with the closed-
system purge and trap analytical method. These samples were collected from each sample interval for
both low-range (0.5 to 250 micrograms per kilogram [μg/kg]) and high-range (>250 μg/kg) laboratory
analysis of VOCs. Low-range samples were collected in 5-gram (g) aliquots and placed in laboratory-
supplied, unpreserved, volatile organic analysis (VOA) bottles. High-range samples were collected in
10g-aliquots, placed in laboratory-supplied VOA bottles preserved with methanol. Soil samples collected
for TPH-DRO were placed in 4-ounce glass jars. The soil samples were collected with gloved hands and
the vials/jars were each labeled with the sample location, sample identification, date, and time of sample
collection, and requested analysis. The soil samples were placed in iced coolers and transported under
chain-of custody protocol to Chemtech-Ford (CTF), a Utah-Certified analytical laboratory, for analysis.

The soil samples were analyzed for TPH-GRO/MBTEXN by U.S. EPA Method 8260D and TPH-DRO by
U.S. EPA Method 8015D with silica gel treatment (SGT).

Following the completion of sampling activities, borings GP-13 and GP-14 were backfilled with bentonite
pellets and hydrated with potable water to seal the borings at each boring location.

5.2 Monitoring Well Installation, Development, and Surveying

Six of the soil borings (MW-5 through MW-10) were converted into groundwater monitoring wells.

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.

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• 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.

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 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.

5.3 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 April 17 and 19, 2024. The second
groundwater sampling event was completed on July 22, 2024.

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 each of the monitoring wells 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 were analyzed for TPH-DRO using U.S. EPA Method 8015D with SGT, TPH-DRO
fractionation using U.S. EPA Method 8270E for groundwater samples MW-7 and MW-8 only for the initial
sampling event and MW-10 only for the second sampling event, and TPH-GRO fractionation (for
groundwater samples MW-7 and MW-8 only for the initial sampling event and MW-10 only for the second
sampling event), TPH-GRO, and MBTEXN using U.S. EPA Method 8260D.

The drill rods and the stainless-steel groundwater sampling screen were decontaminated prior to the start
of drilling activities and between boring locations. The equipment was decontaminated by pressure
washing each piece of drill rod and screen to remove gross contaminants. Next, the equipment was
washed with an Alconox® and distilled water solution and then rinsed with distilled water.

6. FIELD OBSERVATIONS AND LABORATORY ANALYTICAL RESULTS

6.1 Soil Sampling

Soils at the Site generally consist of gravelly sand (SP), silt (ML), silty clay (CL), sand (SW), silty sand
(SM), and sandy gravel (GW). Depth to groundwater at the Site ranged from approximately 3.5 to 10 feet
bgs. Elevated PID readings and petroleum odors indicative of contaminated soil was observed in borings

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MW-7, MW-8, and MW-10. Elevated PID readings or petroleum odors were not observed in any of the
other borings. The boring logs are presented in Appendix B.

Analyte concentrations in soil were compared to the U.S. EPA Regional Screening Levels (RSLs) for
Residential and Industrial Soil, the Utah ISLs, and the Utah DERR RBCA Site-Specific Cleanup Levels
(SSCLs), where applicable. Wasatch used the DERR SSCL Calculator version 1.2 to calculate the
SSCLs (see Appendix D). A soil exceedance map (for the data collected by Wasatch only) is presented
as Figure 3. Soil analytical data are summarized in Table 1. The laboratory analytical report and chain-
of-custody documentation are presented in Appendix C.

No analytes were detected at concentrations that exceeded their applicable screening levels.

6.2 Monitoring Well Installation, Development, and Surveying

Wasatch supervised or completed the successful installation of six groundwater monitoring wells at the
Site. The monitoring wells were installed by DPS using direct-push or hollow-stem auger drilling
techniques. The well construction logs are presented as Appendix B.

Approximately 8 to 12 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 thin-spread on the ground surface near each well.

The monitoring wells top-of-casing (TOC) elevations were surveyed by Wasatch personnel. 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.

6.3 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 April 17, 2024, it appears
that the shallow groundwater flow direction is generally to the northeast at 0.0034 feet/foot. Based on
the groundwater elevation data collected on July 2, 2024, it appears that the shallow groundwater flow
direction is generally to the northeast at 0.0033 feet/foot. See Figures 5 and 6 for the April 17, 2024, and
the July 2, 2024, 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 4. Groundwater analytical
data are summarized in Table 2. The laboratory analytical report and chain -of-custody documentation
are presented in Appendix C.

6.3.1 April Sampling Event

Naphthalene was detected in one groundwater sample (MW-7) at a concentration (12 µg/L)
below the Utah ISLs and Utah RBCA Tier 1 Screening Level.

TPH-GRO was detected in groundwater samples MW-7 (339 µg/L) and MW-10 (144 µg/L). Both
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-7 (1,600 µg/L) and MW-10 (1,800 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.

No TPH-GRO/TPH-DRO fractionation range concentrations exceeded the calculated SSCL for
any of the exposure risks.

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No other petroleum hydrocarbons were detected in the groundwater samples collected.

6.3.2 July Sampling Event

Naphthalene was detected in groundwater sample MW-10 at a concentration of 20 µg/L. This
concentration is below the Utah ISL for naphthalene of 700 µg/L.

TPH-GRO was detected in groundwater samples MW-7 (3,490 µg/L), MW-9 (153 µg/L), and MW-
10 (1,370 µg/L). The MW-7 and MW-10 TPH-GRO concentrations exceed 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-5 (1,000 µg/L), MW-7 (6,200 µg/L), MW-8
(2,000 µg/L), MW-9 (3,700 µg/L), and MW-10 (59,400 µg/L). The MW-7, MW-8, MW-9, and MW-
10 TPH-DRO concentrations exceed 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.

7. CONCLUSIONS AND RECOMMENDATIONS

Wasatch successfully completed eight soil borings at the Site that facilitated the collection and analysis of
soil samples and the installation, development, surveying, and sampling of six groundwater monitoring
wells. Two groundwater sampling events were completed in which all monitoring wells were sampled.

No petroleum hydrocarbon impacts to soil exceeding applicable Utah ISLs were detected in any of the
borings.

Based on the groundwater elevation data, groundwater at the Site flows generally to the northeast at
0.0033 to 0.0034 feet/foot.

Petroleum hydrocarbon impacts to groundwater exceeding their applicable Utah ISLs were detected in
monitoring wells MW-7, MW-8, MW-9, and MW-10 in one or more sampling events. In general, TPH-
GRO and TPH-DRO concentrations in groundwater increased from the April 2024 sampling event to the
July 2024 sampling event. However, the TPH-GRO and TPH-DRO (highest detected concentration) in
MW-10 were fractionated and none of the fractionation data exceeded any of the applicable SSCLs.
Therefore, the increase in petroleum hydrocarbon impacts has not resulted in exceedances of the
exposure risks calculated for the SSCLs.

No soil or groundwater data exhibited TPH-GRO or TPH-DRO fractionation that exceeded any of the
calculated SSCLs.

Monitoring well MW-8 was installed adjacent to the previous GP-12 boring which exhibited the highest
concentrations of TPH-GRO (30,500 µg/L) and TPH-DRO (35,700 µg/L) in groundwater from the previous
sampling events. TPH-GRO was not detected from the groundwater samples collected from the MW-8
well. The highest concentration of TPH-DRO detected in MW-8 was 2,000 µg/L, and was not detected in
the other sample collected. This indicates that the high TPH-DRO and TPH-GRO concentrations (which
the associated TPH fractionation data exceeded the SSCL for Ingestion of Groundwater) detected in the
GP-2 boring sample previously collected are likely elevated due to the turbidity of the samples collected,
and actual dissolved phase analytes concentrations are more representative from the groundwater
samples collected from the newly installed monitoring wells. Additionally, the TPH fractionation data
collected from MW-8 did not exceed any of the SSCLs. Therefore, it is Wasatch’s opinion that the single

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groundwater SSCL exceedance previously detected in the GP-2 groundwater sample at the Site for
Ingestion of Groundwater is not applicable to the Site.

Based on the Site soil data, it is Wasatch’s opinion that the lateral and vertical extent of petroleum
hydrocarbon impacts to soil have been sufficiently defined. Recent soil samples collected from the Site
exhibited TPH-GRO and/or TPH-DRO fractionation data that exceed the Indoor Air Vapor Inhalation
SSCL. No other SSLCs were exceeded .

Based on the Site groundwater data, it is Wasatch’s opinion that the lateral and vertical extent of
petroleum hydrocarbon impacts to groundwater have been sufficiently defined. Recent groundwater
sample (groundwater sample GP-2 [the highest TPH-GRO concentration detected in groundwater] from
the August 31, 2023, event) collected from the Site exhibited TPH-GRO and/or TPH-DRO fractionation
data that exceeded the Ingestion of Groundwater SSCL. No other SSLCs were exceeded in this or any
other borings or wells. The highest TPH-DRO concentration detected in groundwater (groundwater
sample MW-10 collected during the July 2024 event) did not exceed any SSCLs. Given this, it is
Wasatch’s opinion that petroleum impacted groundwater migrating off-Site is not migrating off-Site at
concentrations that exceed the SSCLs.

Based on the totality of the analytical data (including past investigations), the concentrations of petroleum
hydrocarbons at the Site have reduced over time, and the area of impacts exceeding the applicable Utah
ISLs has reduced in size compared to the “historical residual impacts above ISLs” area depicted on
Figures 2 through 4.

Given the totality of the data collected from the Site, the age and apparent degradation of the release,
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 Site, the
installation of vapor intrusion mitigation measures, recording a DERR-approved Environmental Covenant
and Site Management Plan to the Weber County Recorders 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. Jake Scott, P.G.
Senior Project Hydrogeologist Staff Geologist

FIGURES

Figure 1 – Site Vicinity Map
Figure 2 – Historical Sample Location Map
Figure 3 – Soil Exceedance Map
Figure 4 – Groundwater Exceedance Map
Figure 5 – April 17, 2024, Potentiometric Surface Map
Figure 6 – July 2, 2024, Potentiometric Surface Map

Wasatch Environmental Inc.
Page 10
TABLES

Table 1 – Soil Analytical Data
Table 2 – 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

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 2737-001B
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 2737-001B
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
Wasatch Monitoring Well Location
March 2023 Wasatch Boring Location
The use or reuse of this information is restricted to the referenced document unless otherwise authorized.
Wasatch Environmental Copyright 2006
WEI 2737-001B
Figure 3Soil 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 March 2023 Boring Location
LEGEND
1 inch = 29 feet
Wasatch August 2023 Boring Location
*Soil concentrations expressed in
milligrams per kilogram (mg/kg)
TPH-DRO: 761

TPH-DRO: 2,840

TPH-GRO: 193
THP-DRO: 7,070
TPH-DRO: 701

TPH-GRO: 222

Naphthalene: 5.92

Wasatch April 2024 Boring Location
Wasatch Monitoring Well Location
WALL AVENUE APARTMENTS PROPERTY
Former
Apartment
Building
The use or reuse of this information is restricted to the referenced document unless otherwise authorized.
Wasatch Environmental Copyright 2006
WEI 2737-001B
Figure 4 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)
TPH-GRO: 4,660
TPH-DRO: 14,800

TPH-GRO: 1,150
TPH-DRO: 2,000

TPH-DRO: 2,200

TPH-GRO: 1,700

TPH-GRO: 1,100
TPH-DRO: 17,600

TPH-GRO: 30,500
TPH-DRO: 35,700

TPH-GRO: 17,400
TPH-DRO: 16,600

Wasatch Monitoring Well Location
April 17, 2024
TPH-DRO: 1,600
July 2, 2024
TPH-GRO: 3,490
TPH-DRO: 6,200

April 17, 2024
TPH-DRO: 1,800
July 2, 2024
TPH-GRO: 1,370
TPH-DRO: 59,400

TPH-DRO: 2,000

TPH-DRO: 3,700

WALL AVENUE APARTMENTS PROPERTY
The use or reuse of this information is restricted to the referenced document unless otherwise authorized.
Wasatch Environmental Copyright 2006
WEI 2737-001B
Figure 51 inch = 29 feet
LEGEND
Groundwater Elevation Contour
0.01 Groundwater Elevation (feet)
Monitoring Well Location
90.97
90.95
90.92
90.90
April 17, 2024, Potentiometric Surface Map
WALL AVENUE APARTMENTS PROPERTY
The use or reuse of this information is restricted to the referenced document unless otherwise authorized.
Wasatch Environmental Copyright 2006
WEI 2737-001B
Figure 61 inch = 29 feet

LEGEND
Groundwater Elevation Contour
0.01 Groundwater Elevation (feet)
Monitoring Well Location
July 2, 2024, Potentiometric Surface Map
WALL AVENUE APARTMENTS PROPERTY

Tables

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GP-1 (10')0.0 10 4/24/2023 <0.500 <4.00 0.00165 <0.00100 <0.00500 <0.00500 <0.00300 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
GP-2 (13')0.0 13 4/24/2023 <0.500 <4.00 0.00290 <0.00100 <0.00500 <0.00500 <0.00300 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
GP-3 (14')276 14 4/24/2023 <250 <200 <0.500 <0.500 <2.50 <2.50 <1.50 <0.500 <0.500 <0.500 <0.500 <0.500 NA NA NA NA NA NA NA NA NA NA 0.0115 0.0146 0.0143 0.0106 0.0114 0.0184 0.00977 0.0102 0.0186 2.92 74.0 23.9 9.95
GP-4 (13')43 13 4/24/2023 5.05 40.3 0.00267 <0.00100 <0.00500 <0.00500 <0.00300 0.00215 0.00128 0.00830 0.00793 0.00112 NA NA NA NA NA NA NA NA NA NA <0.00600 <0.00600 <0.00600 <0.00600 <0.00600 <0.00600 <0.00600 <0.00600 <0.00600 3.20 31.6 8.48 4.40
GP-5 (4')0.0 4 4/24/2023 <0.500 NA <0.00100 <0.00100 <0.00500 <0.00500 <0.00300 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
GP-1 (8')0.0 8 8/31/23 <0.0535 <58 <0.002 <0.005 <0.005 <0.005 <0.005 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 NA
GP-1 (14')0.0 14 8/31/23 <0.0581 <55 <0.002 <0.006 <0.006 <0.006 <0.006 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 NA
GP-2 (9')107 9 8/31/23 118 2,840 <0.003 <0.006 0.09 <0.006 <0.006 NA NA NA NA NA <0.06 <0.06 108 9.94 <0.24 144 17.7 8.50 11.2 <0.24 <0.48 <0.48 <0.48 <0.48 <0.48 <0.48 <0.48 <0.48 <0.48 NA NA NA NA
GP-2 (14')0.0 14 8/31/23 26.4 761 <0.002 0.007 1.57 <0.006 <0.006 NA NA NA NA NA <0.06 <0.06 16.7 8.09 <0.25 353 27.3 31.9 46.1 0.22 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA NA NA
GP-3 (14')1,198 14 8/31/23 193 7,070 <0.12 <0.30 5.92 <0.30 <0.30 NA NA NA NA NA <2.96 <2.96 79.1 108 <4.73 874 46.2 38.5 803 4.80 <9.47 <9.47 <9.47 <9.47 <9.47 <9.47 <9.47 <9.47 <9.47 NA NA NA NA
GP-3 (20')21.0 20 8/31/23 <0.0579 <62 <0.002 <0.006 <0.006 <0.006 <0.006 NA NA NA NA NA <0.06 <0.06 <0.06 <0.06 <0.25 0.75 0.45 0.69 8.81 <0.25 <0.49 <0.49 <0.49 <0.49 <0.49 <0.49 <0.49 <0.49 <0.49 NA NA NA NA
GP-4 (7')54.0 7 8/31/23 8.41 701 <0.002 <0.006 <0.006 <0.006 <0.006 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 NA
GP-4 (10')1.0 10 8/31/23 <0.141 <96 <0.006 <0.01 <0.01 <0.01 <0.01 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 NA
GP-5 (8')0.0 8 8/31/23 <0.0764 <55 <0.003 <0.008 <0.008 <0.008 <0.008 NA NA NA NA NA <0.08 <0.08 <0.08 <0.08 <0.22 1.30 0.94 1.41 7.28 <0.22 <0.44 <0.44 <0.44 <0.44 <0.44 <0.44 <0.44 <0.44 <0.44 NA NA NA NA
GP-5 (14')23.0 14 8/31/23 0.505 92 0.008 <0.01 <0.01 0.03 0.03 NA NA NA NA NA <0.12 <0.12 0.43 <0.12 <0.21 3.30 7.38 9.54 50.1 0.83 <0.42 <0.42 <0.42 <0.42 <0.42 0.12 <0.42 0.31 <0.42 NA NA NA NA
GP-6 (8')0.0 8 8/31/23 <0.101 <58 <0.004 <0.01 <0.01 <0.01 <0.01 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 NA
GP-6 (15')0.0 15 8/31/23 <0.117 <84 <0.005 <0.01 <0.01 <0.01 <0.01 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 NA
GP-7 (8')0.0 8 8/31/23 <0.0926 <50 <0.004 <0.009 <0.009 <0.009 <0.009 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 NA
GP-7 (15')0.0 15 8/31/23 <0.0774 <57 <0.003 <0.008 <0.008 <0.008 <0.008 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 NA
GP-8 (8')0.0 8 8/31/23 <0.0507 <60 <0.002 <0.005 <0.005 <0.005 <0.005 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 NA
GP-8 (15')0.0 15 8/31/23 <0.0767 <64 <0.003 <0.008 <0.008 <0.008 <0.008 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 NA
GP-9 (8')0.0 8 8/31/23 <0.0587 <58 <0.002 <0.006 <0.006 <0.006 <0.006 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 NA
GP-9 (15')0.0 15 8/31/23 <0.0903 <66 <0.004 <0.009 <0.009 <0.009 <0.009 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 NA
GP-10 (8')0.0 8 8/31/23 <0.0737 <67 <0.003 <0.007 <0.007 <0.007 <0.007 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 NA
GP-10 (15')0.0 15 8/31/23 <0.0646 <56 <0.003 <0.006 <0.006 <0.006 <0.006 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 NA
GP-11 (3')0.0 3 8/31/23 <0.0812 <61 <0.003 <0.008 <0.008 <0.008 <0.008 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 NA
GP-11 (10')10.0 10 8/31/23 2.10 284 <0.002 <0.005 <0.005 <0.005 <0.005 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 NA
GP-12 (3')9.6 3 8/31/23 <0.0769 <55 <0.003 <0.008 <0.008 <0.008 <0.008 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 NA
GP-12 (9')26.0 9 8/31/23 222 323 <0.002 0.008 0.03 <0.006 0.02 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 NA
GP-13 (25')0.0 25 4/10/24 <0.0563 <65 <0.002 <0.006 <0.006 <0.006 <0.006 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 NA
GP-14 (25')0.0 25 4/10/24 <0.0512 <64 <0.002 <0.005 <0.005 <0.005 <0.005 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 NA
MW-5 (3.5')0.0 3.5 4/9/24 1.97 <63 <0.003 <0.007 <0.007 <0.007 <0.007 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 NA
MW-6 (10')0.0 10 4/9/24 <0.0656 <57 <0.003 <0.007 <0.007 <0.007 <0.007 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 NA
MW-7 (20')0.0 20 4/9/24 <0.0549 <63 <0.002 <0.005 <0.005 <0.005 <0.005 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 NA
MW-8 (20')0.0 20 4/9/24 <0.0591 <68 <0.002 <0.006 <0.006 <0.006 <0.006 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 NA
MW-9 (10')0.0 10 4/10/24 <0.0592 <61 <0.002 <0.006 <0.006 <0.006 <0.006 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 NA
MW-10 (9')>999 9 4/10/24 14.8 255 <0.002 <0.006 0.48 <0.006 <0.006 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 NA
------1.2 5.8 2 4,900 580 1,900 3,900 3,800 7,800 7,800 ------------------------------1.1 0.11 1.1 ---110 2,400 1.1 ---1,800 0.68 15,000 120,000 400
------5.1 25 8.6 47,000 2,500 9,900 58,000 24,000 120,000 120,000 ------------------------------21 2.1 21 ---2,100 30,000 21 ---23,000 3.0 220,000 1,800,000 800
150 500 0.2 5.0 51 9 142 ------------------------------------------------------------------------------------
------0.00359 22.2 2.12 72.1 3.06 ---------------0.703 0.957 6.64 9.55 1,020 38.7 608 581,000 581,000 373 845 156 43.9 15,200,000 17,800 65,500 5,560 15,000 56,900 ------------
NOTES:
< = Concentration was below the laboratory reporting limit
U.S. EPA = United States Environmental Protection Agency
RBCA = Risk-Based Corrective Action
--- = Not established
NA = Not analyzed
ppm = parts-per-million
DERR RBCA SSCL = Division or Environmental Response and Remediation Risk-Based Corrective Action Site-Specific Cleanup Level
= Measured concentratoin is greater thant he applicable U.S. EPA Reginonal Screening Level for Idustrial Soil
Table 1
Soil Analytical Data
Wall Avenue Apartment Property
2534 South Wall Avenue
Ogden, Utah
= Measured concentration is greater than the calculated DERR RBCA SSCL for Indoor Air Vapor Inhaloation, no other exposure pathways exceeded the calcualted DERR RBCA SSCLs
BOLD = Measured concentration is greater than the applicable U.S. EPA Federal Maximum Contaminant Level or the Utah Initial Screening Level where applicable
Metals
Only analytes detected above laboratory reporting limits in one or more sample are presented
U.S. EPA Regional Screening Level Residential Soil
Sample I.D.
Sample
Collection
Date
U.S. EPA Regional Screening Level Industrial Soil
April 2024 Additional SI Sampling Event
Volatile Organic Compounds Semi-Volatile Organic Compounds (SVOCs)TPH-GRO Fractionation and TPH-DRO FractionationPetroleum
Hydrocarbons
Utah Initial Screening Level
Depth
(feet)
PID Reading
(ppm)
DERR RBCA SSCL Indoor Air Vapor Inhalation
August 31, 2023 Additional LSI Sampling Event
March 24, 2023 LSI Sampling Event
all concentrations are expressed in milligrams per kilogram (mg/kg)
TP
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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 <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 <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 <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 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 <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 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 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 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 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 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 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 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 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 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 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 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 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 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 NA NA NA NA <12 NA NA NA NA
9.00 91.00 4/17/2024 <125 <1,000 NA NA NA NA NA NA NA NA NA NA 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 NA NA NA NA <12 NA NA NA NA
4.42 90.74 4/17/2024 339 1,600 NA NA NA NA 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 12 NA NA NA NA
4.47 90.69 7/2/2024 3,490 6,200 NA NA NA NA NA NA NA NA NA NA NA NA NA NA <12 NA NA NA NA
5.98 90.71 4/17/2024 <125 <1,000 NA NA NA NA NA NA NA NA NA NA 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 <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 NA NA NA NA <12 NA NA NA NA
8.60 90.52 4/17/2024 <125 <1,000 NA NA NA NA NA NA NA NA NA NA 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 NA NA NA NA <12 NA NA NA NA
8.72 90.76 4/17/2024 144 1,800 NA NA NA NA NA NA NA NA NA NA 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 NA NA NA NA 20 NA NA NA NA
------------------------------------------------------10 2,000 50
1,000 1,000 ------------------------------------------700 ------------
------6,130 6,130 10,200 4,090 4,090 10,200 10,200 204,000 204,000 3,070 ------------2,040 ------------
NOTES:
< = Concentration was below the laboratory reporting limit.
U.S. EPA = United States Environmental Protection Agency.
RBCA = Risk-Based Corrective Action.
--- = 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.
April and July 2024 Additional SI Activities
August 31, 2023 Additional LSI
Metals
Table 2
Groundwater Analytical Data
Wall Avenue Apartment Property
2534 South Wall Avenue
Ogden, Utah
Depth to
Groundwater
(feet)
Groundwater
Elevation
(feet)
Top-Of-Casing
Elevation (Feet)
= 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
100.00
94.44
MW-10 99.48
99.12
96.69
95.16
MW-5
MW-6
MW-7
MW-8
MW-9

Appendix A
Photolog

Photo 1. Drilling monitoring well location MW-5 using
Geoprobe drill rig Photo 2. Soil cores obtained from MW-5
Photo 3. Monitoring well MW-5 surface completion Photo 4. Drilling monitoring well MW-6
Photo 5. Soil cores obtained from MW-6 Photo 6. Monitoring well MW-6 surface completion
Photo 7. Setting up drill rig at boring location GP-14 Photo 8. Soil cores obtained from boring GP-14
Photo 9. Drilling monitoring well MW-7 Photo 10. Soil cores obtained from MW-7
Photo 11. Monitoring well MW-7 surface completion Photo 12. Drilling monitoring well MW-8
Photo 13. Soil cores obtained from monitoring well MW-8 Photo 14. Monitoring well MW-8 surface completion
Photo 15. Drilling boring GP-13 Photo 16. Soil cores obtained from boring GP-13
Photo 17. Drilling monitoring well MW-9 Photo 18. Blue Stakes utility markings completed prior to
drilling activates
Photo 19. Soil cores obtained from monitoring well MW-9 Photo 20. Monitoring well MW-9 surface completion
Photo 21. Drilling monitoring well MW-10 Photo 22. Soil cores obtained from monitoring well MW-
10
Photo 23. Monitoring well MW-10 surface completion

Appendix B
Boring and Well Construction Logs

DATE DRILLED:
LOGGED BY:
REFERENCE ELEVATION:
DRILL RIG:
TOTAL DEPTH:
DEPTH TO GROUNDWATER:
DESCRIPTION AND CLASSIFICATION
Description and Remarks Color
Soil
Type Consist.De
p
t
h

(
f
e
e
t
)
PI
D

(
p
p
m
)
Wat
e
r

L
e
v
e
l
Well
Construction
WELL LOG
BORING NO.:PROJECT NO.:Environmental Science and Engineering
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
GP-13
Sp
l
i
t

S
p
o
o
n

S
a
m
p
l
e
r
So
i
l

S
a
m
p
l
e
Jake Scott
Ground Surface
9’
Geoprobe 7822DT
temporary piezometer
screen set 21’-25’
April 10, 2024
Wall Avenue Release Closure Avtivities
2534 South Wall Avenue
Ogden, Utah
2737-001B
25’
0.0
0.0
0.0
8.0
4.0
0.0
3.0
4.0
0.0
0.0
0.0
0.0
0.0
0.0Silty Sand: fine to medium-grained, some clay, non-plastic,
some small to medium sub-rounded to sub-angular gravel,
moist, saturated at 9’
Brown SM Medium
Dense
Gravelly Sand: fine to coarse-grained, small to large sub-
rounded to sub-angular gravel, slight petroleum hydrocarbon
odor, saturated
Gray SP Medium
Dense
Gravel: small to medium, sub-angular to sub-rounded, well-
graded, some fine to coarse-grained sand, saturated
Gray GW Dense
Silty Clay: moderate-plasticity, some intermittent fine-grained
silty sand lenses throughout, saturated
Brown CL Stiff
Gravel: small to large, sub-angular to rounded, well-graded,
some fine to coarse-grained sand, saturated
Gray GW Dense
Silty Clay: low-plasticity, some intermittent fine-grained
silty sand lenses throughout, saturated
Brown CL Stiff
End of Boring
DATE DRILLED:
LOGGED BY:
REFERENCE ELEVATION:
DRILL RIG:
TOTAL DEPTH:
DEPTH TO GROUNDWATER:
DESCRIPTION AND CLASSIFICATION
Description and Remarks Color
Soil
Type Consist.De
p
t
h

(
f
e
e
t
)
PI
D

(
p
p
m
)
Wat
e
r

L
e
v
e
l
Well
Construction
WELL LOG
BORING NO.:PROJECT NO.:Environmental Science and Engineering
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
GP-14
Sp
l
i
t

S
p
o
o
n

S
a
m
p
l
e
r
So
i
l

S
a
m
p
l
e
Jake Scott
Ground Surface
25’
9’
Geoprobe 7822DT
temporary piezometer
screen set 21’-25’
April 9, 2024
Wall Avenue Release Closure Avtivities
2534 South Wall Avenue
Ogden, Utah
2737-001B
Silty Sand: fine-grained, some clay, non-plastic, trace small sub-
rounded to sub-angular gravel, moist
Dark
Brown
SM Medium
Dense
Silty Clay: low to moderate-plasticity, moist, saturated at 9’Brown/
Gray
CL Medium
Stiff/
Soft
Gravel: small to medium, sub-angular to sub-rounded, well-
graded, some fine to coarse-grained sand, saturated
Gray GW Dense
Sandy Clay: low-plasticity, fine-grained sand, some small sub-
rounded gravel, saturated
Dark
Gray
SC Soft
Silty Clay: low-plasticity, some intermittent fine-grained
silty sand lenses throughout, saturated
Gray CL Stiff
Gravel: small to large, sub-angular to rounded, well-graded,
some fine to coarse-grained sand, saturated
Gray GW Dense
Gravel: small to large, sub-angular to rounded, well-graded,
some fine to coarse-grained sand, saturated
Gray GW Dense
Silty Clay: low-plasticity, some intermittent fine-grained
silty sand lenses throughout, saturated
Gray CL Stiff
End of Boring
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
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
DATE DRILLED:
LOGGED BY: Jake Scott
DEPTH TO GROUNDWATER: 3.5’
BORING NO.: MW-5
7” Flush Mount
Well Vault set in
Concrete
2” PVC
0.25’ to 3’
Hydrated
Medium
Bentonite
1’ to 3’
10/20
Silica Sand
3’-20’
3” PVC
Foot
0.01-Slot
2” PVC
Well Screen
5’ to 20’
End of Boring
REFERENCE ELEVATION: Ground Surface
Well
Construction
2” J-Plug

0.0
Silty Clay: low-plasticity, moist Brown CL Medium
Stiff
TOTAL DEPTH: 20’
’
DRILL RIG: Geoprobe 7822DT
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
April 9, 2024
2737-001BPROJECT NUMBER:
Silty Sand: fine-grained, some clay, non-plastic, moist, saturated
at 3.5’
Brown/
Gray
SM Medium
Dense
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
0.0
0.0
0.0
0.0
0.0
Gravel: small to large, sub-rounded to rounded, well-graded,
some fine to coarse-grained sand, saturated
Gray GW Dense
Silty Clay: low-plasticity, some fine to coarse-grained sand,
saturated
Gray CL Medium
Stiff
Wall Avenue Release Closure Avtivities
2534 South Wall Avenue
Ogden, Utah
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
DATE DRILLED:
LOGGED BY: Jake Scott
DEPTH TO GROUNDWATER: 10’
BORING NO.: MW-6
7” Flush Mount
Well Vault set in
Concrete
2” PVC
0.25’ to 3’
Hydrated
Medium
Bentonite
1’ to 3’
10/20
Silica Sand
3’-20’
3” PVC
Foot
0.01-Slot
2” PVC
Well Screen
5’ to 20’
End of Boring
REFERENCE ELEVATION: Ground Surface
Well
Construction
2” J-Plug

0.0
TOTAL DEPTH: 20’
’
DRILL RIG: Geoprobe 7822DT
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
April 9, 2024
2737-001BPROJECT NUMBER:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
0.0
0.0
0.0
0.0
0.0
Gravelly Sand: fine to coarse-grained, small to large sub-
rounded to sub-angular gravel, some clay, non-plastic, moist
Brown/
Dark
Brown
SP Medium
Stiff
Sandy Gravel: small to large, sub-rounded to sub-angular, fine
to coarse-grained sand, saturated
Brown GP Dense
Silty Clay: low-plasticity, fine to coarse-grained sand, saturated Gray CL Medium
Stiff
Gravel: small to large, sub-rounded to rounded, well-graded,
some fine to coarse-grained sand, saturated
Gray GW Dense
Wall Avenue Release Closure Avtivities
2534 South Wall Avenue
Ogden, Utah
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
DATE DRILLED:
LOGGED BY: Jake Scott
DEPTH TO GROUNDWATER: 5’
BORING NO.: MW-7
7” Flush Mount
Well Vault set in
Concrete
2” PVC
0.25’ to 3’
Hydrated
Medium
Bentonite
1’ to 3’
10/20
Silica Sand
3’-20’
3” PVC
Foot
0.01-Slot
2” PVC
Well Screen
5’ to 20’
End of Boring
REFERENCE ELEVATION: Ground Surface
Well
Construction
2” J-Plug

0.0
TOTAL DEPTH: 20’
’
DRILL RIG: Geoprobe 7822DT
0.0
0.0
0.0
0.0
0.0
0.0
9.0
5.0
3.0
4.0
3.0
3.0
2.0
2.0
April 9, 2024
2737-001BPROJECT NUMBER:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
0.0
0.0
0.0
0.0
0.0
Silty Sand: fine-grained, some clay, non-plastic, trace sub-
rounded gravel, moist
Brown SM Medium
Dense
Sandy Gravel: small to large, sub-rounded to angular, fine to
coarse-grained sand, slight petroleum hydrocarbon odor,
saturated
Brown GP Dense
Sand: fine to coarse-grained, some silt, slight petroleum
hydrocarbon odor, saturated
Brown SP Medium
Dense
Gravel: small to large, sub-angular to rounded, well-graded,
some fine to coarse-grained sand, saturated
Gray GW Dense
Silty Clay: moderate-plasticity, some intermittent fine-grained
silty sand lenses throughout, saturated
Gray CL Soft
Wall Avenue Release Closure Avtivities
2534 South Wall Avenue
Ogden, Utah
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
DATE DRILLED:
LOGGED BY: Jake Scott
DEPTH TO GROUNDWATER: 5’
BORING NO.: MW-8
7” Flush Mount
Well Vault set in
Concrete
2” PVC
0.25’ to 3’
Hydrated
Medium
Bentonite
1’ to 3’
10/20
Silica Sand
3’-20’
3” PVC
Foot
0.01-Slot
2” PVC
Well Screen
5’ to 20’
End of Boring
REFERENCE ELEVATION: Ground Surface
Well
Construction
2” J-Plug

0.0
TOTAL DEPTH: 20’
’
DRILL RIG: Geoprobe 7822DT
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
12
0.0
April 9, 2024
2737-001BPROJECT NUMBER:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
0.0
0.0
0.0
0.0
0.0
Silty Sand: fine-grained, some clay, non-plastic, some small to
large sub-rounded to angular gravel, moist
Dark
Brown
SM Medium
Dense
Gravel: small to large, angular to rounded, well-graded,
some fine to coarse-grained sand, saturated
Gray
Silty Clay: low-plasticity, some intermittent fine-grained
silty sand lenses throughout, saturated
Gray CL Medium
Stiff/
Soft
GW Dense
Silty Clay: low-plasticity, some fine to coarse-grained sand,
moist, saturated at 5’
Brown CL Medium
Stiff
Sandy Gravel: small to large, rounded to sub-angular, fine to
coarse-grained sand, black staining and petroleum hydrocarbon
odor in the 9.5’-10’ interval, saturated
Brown GP Dense
No recovery in the 10’-14’ interval
Wall Avenue Release Closure Avtivities
2534 South Wall Avenue
Ogden, Utah
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
DATE DRILLED:
LOGGED BY: Jake Scott
DEPTH TO GROUNDWATER: 10’
BORING NO.: MW-9
7” Flush Mount
Well Vault set in
Concrete
2” PVC
0.25’ to 3’
Hydrated
Medium
Bentonite
1’ to 3’
10/20
Silica Sand
3’-20’
3” PVC
Foot
0.01-Slot
2” PVC
Well Screen
5’ to 20’
End of Boring
REFERENCE ELEVATION: Ground Surface
Well
Construction
2” J-Plug

0.0Silty Clay: low-plasticity, moist Dark
Brown
CL Medium
Stiff
TOTAL DEPTH: 20’
’
DRILL RIG: Geoprobe 7822DT
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
April 10, 2024
Wall Avenue Release Closure Avtivities
2534 South Wall Avenue
Ogden, Utah
2737-001BPROJECT NUMBER:
Asphalt and road base fill
Silty Sand: fine-grained, come clay, non-plastic, moist,Brown SM Medium
Dense
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
0.0
0.0
0.0
0.0
0.0
Sandy Gravel: small to large, sub-angular to angular, fine to
coarse-grained sand, moist, saturated at 10’
Light
Brown
GP Dense
Gravel: small to large, sub-angular to rounded, well-graded,
some fine to coarse-grained sand, saturated
Gray GW Dense
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
DATE DRILLED:
LOGGED BY: Jake Scott
DEPTH TO GROUNDWATER: 9’
BORING NO.: MW-10
7” Flush Mount
Well Vault set in
Concrete
2” PVC
0.25’ to 3’
Hydrated
Medium
Bentonite
1’ to 3’
10/20
Silica Sand
3’-20’
3” PVC
Foot
0.01-Slot
2” PVC
Well Screen
5’ to 20’
End of Boring
REFERENCE ELEVATION: Ground Surface
Well
Construction
2” J-Plug

0.0
TOTAL DEPTH: 20’
’
DRILL RIG: Geoprobe 7822DT
0.0
0.0
0.0
0.0
119
758
>999
>999
548
559
476
78
6
5
April 10, 2024
2737-001BPROJECT NUMBER:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
48
9
6
4
4
Wall Avenue Release Closure Avtivities
2534 South Wall Avenue
Ogden, Utah
Silty Clay: low-plasticity, moist Dark
Brown
CL Medium
Stiff
Asphalt and road base fill
Silty Sand: fine-grained, come clay, non-plastic, moist,Brown SM Medium
Dense
Gravel: small to large, sub-angular to rounded, well-graded,
some fine to coarse-grained sand, slight petroleum hydrocarbon
odor, saturated
Brown GW Dense
Silty Clay: moderate-plasticity, strong petroleum hydrocarbon
odor, moist, saturated at 9’
Gray CL Soft

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: 24D0898
Project: 2737-001B
4/18/2024
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
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:
2737-001B
4/11/24 9:55 @ 4.9 °C
4/18/2024
2737-001B
Sample ID: MW-5 (3.5')
Lab ID: 24D0898-01Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/9/24 10:00
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/kg dry 4/16/244/16/2463EPA 8015 CNDDiesel Range Organics
Inorganic
%4/12/244/11/240.1 CTF800079.7Total Solids
MBTEXn
mg/kg dry ISTD-014/15/244/15/240.003 EPA 8260D/5035ANDBenzene
mg/kg dry ISTD-014/15/244/15/240.007 EPA 8260D/5035ANDEthylbenzene
mg/kg dry ISTD-014/15/244/15/240.003 EPA 8260D/5035ANDMethyl tert-Butyl Ether (MTBE)
mg/kg dry ISTD-014/15/244/15/240.007 EPA 8260D/5035ANDNaphthalene
mg/kg dry ISTD-014/15/244/15/240.007 EPA 8260D/5035ANDToluene
mg/kg dry ISTD-014/15/244/15/240.007 EPA 8260D/5035ANDXylenes, total
Gasoline Range
mg/kg dry 4/15/244/15/240.0740 EPA 8260B/C 5035A/[CALC]1.97Gasoline Range Organics
Project Name: 2737-001B CtF WO#: 24D0898
www.ChemtechFord.com
Page 2 of 11Page 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
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001B
4/11/24 9:55 @ 4.9 °C
4/18/2024
2737-001B
Sample ID: MW-6 (10')
Lab ID: 24D0898-02Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/9/24 11:15
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/kg dry 4/16/244/16/2457EPA 8015 CNDDiesel Range Organics
Inorganic
%4/12/244/11/240.1 CTF800088.0Total Solids
MBTEXn
mg/kg dry 4/15/244/15/240.003 EPA 8260D/5035ANDBenzene
mg/kg dry 4/15/244/15/240.007 EPA 8260D/5035ANDEthylbenzene
mg/kg dry 4/15/244/15/240.003 EPA 8260D/5035ANDMethyl tert-Butyl Ether (MTBE)
mg/kg dry 4/15/244/15/240.007 EPA 8260D/5035ANDNaphthalene
mg/kg dry 4/15/244/15/240.007 EPA 8260D/5035ANDToluene
mg/kg dry 4/15/244/15/240.007 EPA 8260D/5035ANDXylenes, total
Gasoline Range
mg/kg dry 4/15/244/15/240.0656 EPA 8260B/C 5035A/[CALC]NDGasoline Range Organics
Project Name: 2737-001B CtF WO#: 24D0898
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
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001B
4/11/24 9:55 @ 4.9 °C
4/18/2024
2737-001B
Sample ID: MW-7 (20')
Lab ID: 24D0898-03Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/9/24 13:15
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/kg dry 4/16/244/16/2463EPA 8015 CNDDiesel Range Organics
Inorganic
%4/12/244/11/240.1 CTF800079.9Total Solids
MBTEXn
mg/kg dry 4/15/244/15/240.002 EPA 8260D/5035ANDBenzene
mg/kg dry 4/15/244/15/240.005 EPA 8260D/5035ANDEthylbenzene
mg/kg dry 4/15/244/15/240.002 EPA 8260D/5035ANDMethyl tert-Butyl Ether (MTBE)
mg/kg dry 4/15/244/15/240.005 EPA 8260D/5035ANDNaphthalene
mg/kg dry 4/15/244/15/240.005 EPA 8260D/5035ANDToluene
mg/kg dry 4/15/244/15/240.005 EPA 8260D/5035ANDXylenes, total
Gasoline Range
mg/kg dry 4/15/244/15/240.0549 EPA 8260B/C 5035A/[CALC]NDGasoline Range Organics
Project Name: 2737-001B CtF WO#: 24D0898
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
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001B
4/11/24 9:55 @ 4.9 °C
4/18/2024
2737-001B
Sample ID: MW-8 (20')
Lab ID: 24D0898-04Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/9/24 14:45
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/kg dry 4/16/244/16/2468EPA 8015 CNDDiesel Range Organics
Inorganic
%4/12/244/11/240.1 CTF800073.5Total Solids
MBTEXn
mg/kg dry 4/16/244/16/240.002 EPA 8260D/5030BNDBenzene
mg/kg dry 4/16/244/16/240.006 EPA 8260D/5030BNDEthylbenzene
mg/kg dry 4/16/244/16/240.002 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/kg dry 4/16/244/16/240.006 EPA 8260D/5030BNDNaphthalene
mg/kg dry 4/16/244/16/240.006 EPA 8260D/5030BNDToluene
mg/kg dry 4/16/244/16/240.006 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/kg dry 4/16/244/16/240.0591 EPA 8260B/C 5035A/[CALC]NDGasoline Range Organics
Project Name: 2737-001B CtF WO#: 24D0898
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
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001B
4/11/24 9:55 @ 4.9 °C
4/18/2024
2737-001B
Sample ID: MW-9 (10')
Lab ID: 24D0898-05Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/10/24 10:45
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/kg dry 4/16/244/16/2461EPA 8015 CNDDiesel Range Organics
Inorganic
%4/12/244/11/240.1 CTF800081.3Total Solids
MBTEXn
mg/kg dry 4/15/244/15/240.002 EPA 8260D/5035ANDBenzene
mg/kg dry 4/15/244/15/240.006 EPA 8260D/5035ANDEthylbenzene
mg/kg dry 4/15/244/15/240.002 EPA 8260D/5035ANDMethyl tert-Butyl Ether (MTBE)
mg/kg dry 4/15/244/15/240.006 EPA 8260D/5035ANDNaphthalene
mg/kg dry 4/15/244/15/240.006 EPA 8260D/5035ANDToluene
mg/kg dry 4/15/244/15/240.006 EPA 8260D/5035ANDXylenes, total
Gasoline Range
mg/kg dry 4/15/244/15/240.0592 EPA 8260B/C 5035A/[CALC]NDGasoline Range Organics
Project Name: 2737-001B CtF WO#: 24D0898
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
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001B
4/11/24 9:55 @ 4.9 °C
4/18/2024
2737-001B
Sample ID: MW-10 (9')
Lab ID: 24D0898-06Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/10/24 11:55
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/kg dry 4/16/244/16/2464EPA 8015 C255Diesel Range Organics
Inorganic
%4/12/244/11/240.1 CTF800078.0Total Solids
MBTEXn
mg/kg dry 4/15/244/15/240.002 EPA 8260D/5035ANDBenzene
mg/kg dry 4/15/244/15/240.006 EPA 8260D/5035ANDEthylbenzene
mg/kg dry 4/15/244/15/240.002 EPA 8260D/5035ANDMethyl tert-Butyl Ether (MTBE)
mg/kg dry 4/15/244/15/240.32 EPA 8260D/5035A0.48Naphthalene
mg/kg dry 4/15/244/15/240.006 EPA 8260D/5035ANDToluene
mg/kg dry 4/15/244/15/240.006 EPA 8260D/5035ANDXylenes, total
Gasoline Range
mg/kg dry 4/15/244/15/240.320 EPA 8260B/C 5035A/[CALC]14.8Gasoline Range Organics
Project Name: 2737-001B CtF WO#: 24D0898
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
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001B
4/11/24 9:55 @ 4.9 °C
4/18/2024
2737-001B
Sample ID: GP-13 (25')
Lab ID: 24D0898-07Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/10/24 9:50
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/kg dry 4/16/244/16/2465EPA 8015 CNDDiesel Range Organics
Inorganic
%4/12/244/11/240.1 CTF800077.4Total Solids
MBTEXn
mg/kg dry 4/16/244/16/240.002 EPA 8260D/5030BNDBenzene
mg/kg dry 4/16/244/16/240.006 EPA 8260D/5030BNDEthylbenzene
mg/kg dry 4/16/244/16/240.002 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/kg dry 4/16/244/16/240.006 EPA 8260D/5030BNDNaphthalene
mg/kg dry 4/16/244/16/240.006 EPA 8260D/5030BNDToluene
mg/kg dry 4/16/244/16/240.006 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/kg dry 4/16/244/16/240.0563 EPA 8260B/C 5035A/[CALC]NDGasoline Range Organics
Project Name: 2737-001B CtF WO#: 24D0898
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
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001B
4/11/24 9:55 @ 4.9 °C
4/18/2024
2737-001B
Sample ID: GP-14 (25')
Lab ID: 24D0898-08Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/10/24 12:25
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/kg dry 4/16/244/16/2464EPA 8015 CNDDiesel Range Organics
Inorganic
%4/12/244/11/240.1 CTF800077.8Total Solids
MBTEXn
mg/kg dry 4/15/244/15/240.002 EPA 8260D/5035ANDBenzene
mg/kg dry 4/15/244/15/240.005 EPA 8260D/5035ANDEthylbenzene
mg/kg dry 4/15/244/15/240.002 EPA 8260D/5035ANDMethyl tert-Butyl Ether (MTBE)
mg/kg dry 4/15/244/15/240.005 EPA 8260D/5035ANDNaphthalene
mg/kg dry 4/15/244/15/240.005 EPA 8260D/5035ANDToluene
mg/kg dry 4/15/244/15/240.005 EPA 8260D/5035ANDXylenes, total
Gasoline Range
mg/kg dry 4/15/244/15/240.0512 EPA 8260B/C 5035A/[CALC]NDGasoline Range Organics
Project Name: 2737-001B CtF WO#: 24D0898
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
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
2737-001B
4/11/24 9:55 @ 4.9 °C
4/18/2024
2737-001B
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.
Project Name: 2737-001B CtF WO#: 24D0898
www.ChemtechFord.com
Page 10 of 11Page 10 of 11
Page 11 of 11
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: 24D1453
Project: Former Super Sonic Carwash
4/24/2024
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:
2737-001B
4/18/24 9:01 @ 1.6 °C
4/24/2024
Former Super Sonic Carwash
Sample ID: MW-5
Lab ID: 24D1453-01Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/17/24 10:30
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/L 4/23/244/23/241.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 4/18/244/18/240.005 EPA 8260D/5030BNDBenzene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 4/18/244/18/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDToluene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 4/18/244/18/240.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: Former Super Sonic Carwash CtF WO#: 24D1453
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:
2737-001B
4/18/24 9:01 @ 1.6 °C
4/24/2024
Former Super Sonic Carwash
Sample ID: MW-6
Lab ID: 24D1453-02Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/17/24 10:00
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/L 4/23/244/23/241.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 4/18/244/18/240.005 EPA 8260D/5030BNDBenzene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 4/18/244/18/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDToluene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 4/18/244/18/240.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: Former Super Sonic Carwash CtF WO#: 24D1453
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:
2737-001B
4/18/24 9:01 @ 1.6 °C
4/24/2024
Former Super Sonic Carwash
Sample ID: MW-7
Lab ID: 24D1453-03Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/17/24 11:10
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/L 4/23/244/23/241.0 EPA 8015 C1.6Diesel Range Organics
BETX Compounds
mg/L 4/18/244/18/240.125 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 4/18/244/18/240.125 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 4/18/244/18/240.125 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 4/18/244/18/240.125 EPA 8260D/5030B0.339C9-C10 Alkyl Benzenes
mg/L 4/18/244/18/240.005 EPA 8260D/5030BNDBenzene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 4/18/244/18/240.012 EPA 8260D/5030B0.012Naphthalene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDToluene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDXylenes, total
MBTEXn
mg/L 4/18/244/18/240.005 EPA 8260D/5030BNDBenzene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 4/18/244/18/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 4/18/244/18/240.012 EPA 8260D/5030B0.012Naphthalene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDToluene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 4/18/244/18/240.125 EPA 8260B/C 5030A/[CALC]0.339Gasoline Range Organics
Project Name: Former Super Sonic Carwash CtF WO#: 24D1453
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:
2737-001B
4/18/24 9:01 @ 1.6 °C
4/24/2024
Former Super Sonic Carwash
Sample ID: MW-8
Lab ID: 24D1453-04Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/17/24 11:50
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/L 4/23/244/23/241.0 EPA 8015 CNDDiesel Range Organics
BETX Compounds
mg/L 4/18/244/18/240.125 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 4/18/244/18/240.125 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 4/18/244/18/240.125 EPA 8260D/5030BNDC9-C10 Aliphatic hydrocarbons
mg/L 4/18/244/18/240.125 EPA 8260D/5030BNDC9-C10 Alkyl Benzenes
mg/L 4/18/244/18/240.005 EPA 8260D/5030BNDBenzene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDToluene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDXylenes, total
MBTEXn
mg/L 4/18/244/18/240.005 EPA 8260D/5030BNDBenzene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 4/18/244/18/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDToluene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 4/18/244/18/240.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: Former Super Sonic Carwash CtF WO#: 24D1453
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:
2737-001B
4/18/24 9:01 @ 1.6 °C
4/24/2024
Former Super Sonic Carwash
Sample ID: MW-9
Lab ID: 24D1453-05Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/17/24 8:55
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/L 4/23/244/23/241.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 4/18/244/18/240.005 EPA 8260D/5030BNDBenzene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 4/18/244/18/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDToluene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 4/18/244/18/240.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: Former Super Sonic Carwash CtF WO#: 24D1453
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:
2737-001B
4/18/24 9:01 @ 1.6 °C
4/24/2024
Former Super Sonic Carwash
Sample ID: MW-10
Lab ID: 24D1453-06Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/17/24 9:25
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/L 4/23/244/23/241.0 EPA 8015 C1.8Diesel Range Organics
MBTEXn
mg/L 4/18/244/18/240.005 EPA 8260D/5030BNDBenzene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 4/18/244/18/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDToluene
mg/L 4/18/244/18/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 4/18/244/18/240.125 EPA 8260B/C 5030A/[CALC]0.144Gasoline Range Organics
Project Name: Former Super Sonic Carwash CtF WO#: 24D1453
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:
2737-001B
4/18/24 9:01 @ 1.6 °C
4/24/2024
Former Super Sonic Carwash
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: Former Super Sonic Carwash CtF WO#: 24D1453
www.ChemtechFord.com
Page 8 of 9Page 8 of 9
No vials submitted for 8270.
Client is resampling.-JA
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: 24D1658
Project: Former Super Sonic Carwash
4/30/2024
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 5
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
4/22/24 11:02 @ 8.3 °C
4/30/2024
Former Super Sonic Carwash
Sample ID: MW-7
Lab ID: 24D1658-01Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/19/24 8:00
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Semi-Volatile Compounds
ug/L 4/23/244/23/2410EPA 8270E/3511176C11-12 Aliphatic hydrocarbons
ug/L 4/23/244/23/24200EPA 8270E/35113090C13-C16 Aliphatic hydrocarbons
ug/L 4/23/244/23/2410EPA 8270E/3511108C17-C21 Aliphatic hydrocarbons
ug/L 4/23/244/23/2410EPA 8270E/3511573C22-C35 Aliphatic hydrocarbons
ug/L 4/23/244/23/2410EPA 8270E/3511NDC11-C13 Alkyl Naphthalenes
ug/L 4/23/244/23/2410EPA 8270E/3511NDTotal C12-C22 PAH
ug/L 4/23/244/23/2410EPA 8270E/3511NDAcenaphthene
ug/L 4/23/244/23/2410EPA 8270E/3511NDAcenaphthylene
ug/L 4/23/244/23/2410EPA 8270E/3511NDAnthracene
ug/L 4/23/244/23/2410EPA 8270E/3511NDBenzo (a) anthracene
ug/L 4/23/244/23/2410EPA 8270E/3511NDBenzo (a) pyrene
ug/L 4/23/244/23/2410EPA 8270E/3511NDBenzo (b) fluoranthene
ug/L 4/23/244/23/2410EPA 8270E/3511NDBenzo (g,h,i) perylene
ug/L 4/23/244/23/2410EPA 8270E/3511NDBenzo (k) fluoranthene
ug/L 4/23/244/23/2410EPA 8270E/3511NDChrysene
ug/L 4/23/244/23/2410EPA 8270E/3511NDDibenzo (a,h) anthracene
ug/L 4/23/244/23/2410EPA 8270E/3511NDFluoranthene
ug/L 4/23/244/23/2410EPA 8270E/3511NDFluorene
ug/L 4/23/244/23/2410EPA 8270E/3511NDIndeno (1,2,3-cd) pyrene
ug/L 4/23/244/23/2410EPA 8270E/3511NDPhenanthrene
ug/L 4/23/244/23/2410EPA 8270E/3511NDPyrene
Project Name: Former Super Sonic Carwash CtF WO#: 24D1658
www.ChemtechFord.com
Page 2 of 5Page 2 of 5
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
4/22/24 11:02 @ 8.3 °C
4/30/2024
Former Super Sonic Carwash
Sample ID: MW-8
Lab ID: 24D1658-02Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 4/19/24 8:15
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Semi-Volatile Compounds
ug/L 4/23/244/23/2410EPA 8270E/351173C11-12 Aliphatic hydrocarbons
ug/L 4/23/244/23/2410EPA 8270E/3511130C13-C16 Aliphatic hydrocarbons
ug/L 4/23/244/23/2410EPA 8270E/351122C17-C21 Aliphatic hydrocarbons
ug/L 4/23/244/23/2410EPA 8270E/3511356C22-C35 Aliphatic hydrocarbons
ug/L 4/23/244/23/2410EPA 8270E/3511NDC11-C13 Alkyl Naphthalenes
ug/L 4/23/244/23/2410EPA 8270E/3511NDTotal C12-C22 PAH
ug/L 4/23/244/23/2410EPA 8270E/3511NDAcenaphthene
ug/L 4/23/244/23/2410EPA 8270E/3511NDAcenaphthylene
ug/L 4/23/244/23/2410EPA 8270E/3511NDAnthracene
ug/L 4/23/244/23/2410EPA 8270E/3511NDBenzo (a) anthracene
ug/L 4/23/244/23/2410EPA 8270E/3511NDBenzo (a) pyrene
ug/L 4/23/244/23/2410EPA 8270E/3511NDBenzo (b) fluoranthene
ug/L 4/23/244/23/2410EPA 8270E/3511NDBenzo (g,h,i) perylene
ug/L 4/23/244/23/2410EPA 8270E/3511NDBenzo (k) fluoranthene
ug/L 4/23/244/23/2410EPA 8270E/3511NDChrysene
ug/L 4/23/244/23/2410EPA 8270E/3511NDDibenzo (a,h) anthracene
ug/L 4/23/244/23/2410EPA 8270E/3511NDFluoranthene
ug/L 4/23/244/23/2410EPA 8270E/3511NDFluorene
ug/L 4/23/244/23/2410EPA 8270E/3511NDIndeno (1,2,3-cd) pyrene
ug/L 4/23/244/23/2410EPA 8270E/3511NDPhenanthrene
ug/L 4/23/244/23/2410EPA 8270E/3511NDPyrene
Project Name: Former Super Sonic Carwash CtF WO#: 24D1658
www.ChemtechFord.com
Page 3 of 5Page 3 of 5
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Wasatch Environmental
Blake Downey
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
4/22/24 11:02 @ 8.3 °C
4/30/2024
Former Super Sonic Carwash
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: Former Super Sonic Carwash CtF WO#: 24D1658
www.ChemtechFord.com
Page 4 of 5Page 4 of 5
Page 5 of 5
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: 24G0289
Project: Former Super Sonic Carwash
7/12/2024
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:
7/3/24 11:25 @ 3.3 °C
7/12/2024
Former Super Sonic Carwash
Sample ID: MW-5
Lab ID: 24G0289-01Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 7/2/24 9:15
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/L 7/9/247/9/241.0 EPA 8015 C1.0Diesel Range Organics
MBTEXn
mg/L 7/8/247/8/240.005 EPA 8260D/5030BNDBenzene
mg/L 7/8/247/8/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 7/8/247/8/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 7/8/247/8/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 7/8/247/8/240.012 EPA 8260D/5030BNDToluene
mg/L 7/8/247/8/240.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 7/8/247/8/240.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: Former Super Sonic Carwash CtF WO#: 24G0289
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:
7/3/24 11:25 @ 3.3 °C
7/12/2024
Former Super Sonic Carwash
Sample ID: MW-6
Lab ID: 24G0289-02Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 7/2/24 9:45
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/L 7/9/247/9/241.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 7/8/247/8/240.005 EPA 8260D/5030BNDBenzene
mg/L 7/8/247/8/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 7/8/247/8/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 7/8/247/8/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 7/8/247/8/240.012 EPA 8260D/5030BNDToluene
mg/L 7/8/247/8/240.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 7/8/247/8/240.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: Former Super Sonic Carwash CtF WO#: 24G0289
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:
7/3/24 11:25 @ 3.3 °C
7/12/2024
Former Super Sonic Carwash
Sample ID: MW-7
Lab ID: 24G0289-03Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 7/2/24 10:10
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/L 7/9/247/9/241.0 EPA 8015 C6.2Diesel Range Organics
MBTEXn
mg/L 7/11/247/11/240.005 EPA 8260D/5030BNDBenzene
mg/L 7/11/247/11/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 7/11/247/11/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 7/11/247/11/240.012 EPA 8260D/5030B0.012Naphthalene
mg/L 7/11/247/11/240.012 EPA 8260D/5030BNDToluene
mg/L 7/11/247/11/240.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 7/11/247/11/240.125 EPA 8260B/C 5030A/[CALC]3.49Gasoline Range Organics
Project Name: Former Super Sonic Carwash CtF WO#: 24G0289
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:
7/3/24 11:25 @ 3.3 °C
7/12/2024
Former Super Sonic Carwash
Sample ID: MW-8
Lab ID: 24G0289-04Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 7/2/24 10:30
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/L 7/10/247/9/241.0 EPA 8015 C2.0Diesel Range Organics
MBTEXn
mg/L 7/8/247/8/240.005 EPA 8260D/5030BNDBenzene
mg/L 7/8/247/8/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 7/8/247/8/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 7/8/247/8/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 7/8/247/8/240.012 EPA 8260D/5030BNDToluene
mg/L 7/8/247/8/240.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 7/8/247/8/240.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: Former Super Sonic Carwash CtF WO#: 24G0289
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:
7/3/24 11:25 @ 3.3 °C
7/12/2024
Former Super Sonic Carwash
Sample ID: MW-9
Lab ID: 24G0289-05Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 7/2/24 11:00
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/L 7/10/247/10/241.0 EPA 8015 C3.7Diesel Range Organics
MBTEXn
mg/L 7/8/247/8/240.005 EPA 8260D/5030BNDBenzene
mg/L 7/8/247/8/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 7/8/247/8/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 7/8/247/8/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 7/8/247/8/240.012 EPA 8260D/5030BNDToluene
mg/L 7/8/247/8/240.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 7/8/247/8/240.125 EPA 8260B/C 5030A/[CALC]0.153Gasoline Range Organics
Project Name: Former Super Sonic Carwash CtF WO#: 24G0289
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:
7/3/24 11:25 @ 3.3 °C
7/12/2024
Former Super Sonic Carwash
Sample ID: MW-10
Lab ID: 24G0289-06Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 7/2/24 11:30
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/L 7/11/247/10/241.0 EPA 8015 C59.4Diesel Range Organics
BETX Compounds
mg/L 7/11/247/11/240.125 EPA 8260D/5030BNDC5-C6 Aliphatic hydrocarbons
mg/L 7/11/247/11/240.125 EPA 8260D/5030BNDC7-C8 Aliphatic hydrocarbons
mg/L 7/11/247/11/240.125 EPA 8260D/5030B0.734C9-C10 Aliphatic hydrocarbons
mg/L 7/11/247/11/240.125 EPA 8260D/5030B0.613C9-C10 Alkyl Benzenes
MBTEXn
mg/L 7/11/247/11/240.005 EPA 8260D/5030BNDBenzene
mg/L 7/11/247/11/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 7/11/247/11/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 7/11/247/11/240.012 EPA 8260D/5030B0.020Naphthalene
mg/L 7/11/247/11/240.012 EPA 8260D/5030BNDToluene
mg/L 7/11/247/11/240.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 7/11/247/11/240.125 EPA 8260B/C 5030A/[CALC]1.37Gasoline Range Organics
Semi-Volatile Compounds
ug/L 7/8/247/8/2410EPA 8270E/351189C11-12 Aliphatic hydrocarbons
ug/L 7/8/247/8/2410EPA 8270E/3511814C13-C16 Aliphatic hydrocarbons
ug/L 7/8/247/8/2410EPA 8270E/351194C17-C21 Aliphatic hydrocarbons
ug/L 7/8/247/8/2410EPA 8270E/3511626C22-C35 Aliphatic hydrocarbons
ug/L 7/8/247/8/2410EPA 8270E/3511NDC11-C13 Alkyl Naphthalenes
ug/L 7/8/247/8/2410EPA 8270E/3511NDTotal C12-C22 PAH
ug/L 7/8/247/8/2410EPA 8270E/3511NDAcenaphthene
ug/L 7/8/247/8/2410EPA 8270E/3511NDAcenaphthylene
ug/L 7/8/247/8/2410EPA 8270E/3511NDAnthracene
ug/L 7/8/247/8/2410EPA 8270E/3511NDBenzo (a) anthracene
ug/L 7/8/247/8/2410EPA 8270E/3511NDBenzo (a) pyrene
ug/L 7/8/247/8/2410EPA 8270E/3511NDBenzo (b) fluoranthene
ug/L 7/8/247/8/2410EPA 8270E/3511NDBenzo (g,h,i) perylene
ug/L 7/8/247/8/2410EPA 8270E/3511NDBenzo (k) fluoranthene
ug/L 7/8/247/8/2410EPA 8270E/3511NDChrysene
ug/L 7/8/247/8/2410EPA 8270E/3511NDDibenzo (a,h) anthracene
ug/L 7/8/247/8/2410EPA 8270E/3511NDFluoranthene
ug/L 7/8/247/8/2410EPA 8270E/3511NDFluorene
ug/L 7/8/247/8/2410EPA 8270E/3511NDIndeno (1,2,3-cd) pyrene
ug/L 7/8/247/8/2410EPA 8270E/3511NDPhenanthrene
ug/L 7/8/247/8/2410EPA 8270E/3511NDPyrene
Project Name: Former Super Sonic Carwash CtF WO#: 24G0289
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:
7/3/24 11:25 @ 3.3 °C
7/12/2024
Former Super Sonic Carwash
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: Former Super Sonic Carwash CtF WO#: 24G0289
www.ChemtechFord.com
Page 8 of 9Page 8 of 9
Page 9 of 9

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
7/29/2024
12:28 PM
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
7/29/2024
12:28 PM
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
7/29/2024
12:28 PM