HomeMy WebLinkAboutDERR-2024-011579Stantec Consulting Services Inc.
2890 East Cottonwood Parkway Suite 300, Salt Lake City UT 84121-7283
October 22, 2024
File: 203721870
Attention: Nicole Chavez
Utah Department of Environmental Quality
Division of Environmental Response and Remediation
195 North 1950 West, 1st Floor
P.O. Box 144840
Salt Lake City, Utah 84116
Reference: 7-Eleven Store No. 27074 – Quarterly Groundwater Monitoring Report
3185 Harrison Boulevard, Ogden, Utah
Facility ID 1200120, Release Site NXK
Dear Ms. Chavez,
Stantec is pleased to present this Quarterly Groundwater Monitoring Report on behalf of 7-Eleven, Inc.
(7-Eleven) for 7-Eleven Store No. 27074 (the Site) located at 3185 Harrison Boulevard Ogden, Utah
(Figure 1). The Utah Department of Environmental Quality (UDEQ), Division of Environmental Response
and Remediation (DERR) refers to the Site as Facility ID 1200120, Release Site NXK. This report presents
groundwater monitoring and sampling results for the third quarter of 2024.
Four quarterly groundwater monitoring and sampling events were approved under Work Plan and Budget
(WP&B) NXK-07. The objectives of quarterly groundwater monitoring and sampling are to further assess
dissolved petroleum hydrocarbon concentration trends and seasonal groundwater level fluctuations
associated with the Site following the March 2021 remedial excavation. This report also presents the results
of the desktop study to assess the possibility of off-site petroleum hydrocarbon sources contributing to
unexpected dissolved petroleum hydrocarbon concentration trends at the Site.
BACKGROUND
7-Eleven has leased the southern portion of the property since 1986 and operated a 7-Eleven convenience
store with former retail sales of gasoline. The former underground storage tank (UST) system was located
in the southeast side of the property (Figure 1) and consisted of three 10,000-gallon gasoline USTs and
two product dispensers formerly used to distribute various grades of unleaded gasoline fuel.
The northern portion of the property is occupied by an out-of-service automotive service facility, most
recently In’ n’ Out Auto Clinic. The facility was previously operated as a Minit Lube, and a petroleum release
from this facility (Release Site IPT) was discovered during the closure of two 3,000-gallon new oil USTs
and one 3,000-gallon used oil UST on June 24, 1994. The former Minit Lube USTs were in the northwest
portion of the property (behind the automotive service facility) and were closed by removal.
Wasatch Environmental (Wasatch) conducted a limited subsurface investigation (LSI) on April 23, 2020, on
behalf of the Utah Transit Authority (UTA). Residual impacts from Release Site IPT appeared to be present
based on the analytical results of a groundwater sample collected from a temporary well-point within the
October 22, 2024
Page 2 of 6
Re: 7-Eleven Store No. 27074 – Quarterly Groundwater Monitoring Report
3185 Harrison Boulevard, Ogden, Utah
Facility ID 1200120, Release Site NXK
former Minit Lube UST basin (west of the current automotive service facility building). The sample contained
concentrations of total petroleum hydrocarbons as gasoline range organics (TPH-GRO) and TPH as diesel
range organics (TPH-DRO) above the Initial Screening Levels (ISLs) developed by the UDEQ-DERR
Leaking Underground Storage Tank (LUST) Section.
The LSI also identified a release that appeared to be related to the 7-Eleven UST basin, and Stantec
reported a petroleum release to the UDEQ-DERR on May 11, 2020. Soil and groundwater analytical results
presented in the Wasatch LSI report indicated petroleum hydrocarbon concentrations west and south of
the 7-Eleven UST basin exceeded the ISLs and Tier 1 Screening Levels (TSLs) developed by the UDEQ-
DERR LUST Section. Based on these results, the UDEQ-DERR assigned Release Site NXK to the Site
and requested a subsurface investigation
WP&B NXK-01 was approved on September 30, 2020, and Stantec conducted the subsurface investigation
(SI) on October 26 and 27, 2020 (with groundwater sampling conducted on November 12, 2020). Based
on the results of the SI, benzene was reported above the ISL in a soil sample collected from the soil boring
advanced to install monitoring well MW-2. TPH-GRO was reported above the ISL in a soil sample collected
from the soil boring advanced to install MW-4. Groundwater analytical results indicated dissolved
concentrations of benzene, ethylbenzene, TPH-GRO, and TPH-DRO exceeded their respective ISLs and/or
TSLs in samples collected west and south of the UST basin (MW-1, MW-2, MW-3, and MW-4), and
groundwater impacts extended beyond the property boundaries to the south.
The UST system was closed by removal on March 2, 2021. A remedial excavation was then completed
from March 3 through 5 under WP&B NXK-03. Petroleum containing soil (PCS) was removed from the
UST excavation as part of UST closure, and the excavation floor was extended an additional 1.5 to 2 feet
beyond the interface of backfill and native soils to remove additional PCS. Excavated soils were screened
on site using a photoionization detector, and PCS was segregated for disposal. Non-impacted soils were
used as backfill, and additional imported fill was also needed to fill and achieve compaction within the UST
excavation. Approximately 180-tons of PCS were disposed of as non-hazardous waste at the
ET Technologies Soil Regeneration Site at the Salt Lake Valley Landfill.
Under WP&B NXK-02, Stantec conducted quarterly monitoring between the second quarter of 2021 and
the first quarter of 2022. Dissolved petroleum hydrocarbon concentrations generally decreased during this
time but remained above ISLs in MW-1 and MW-4 and TSLs in MW-2.
On April 8, 2022, Stantec oversaw the abandonment of groundwater monitoring wells MW-2, MW-4, MW-5,
and MW-6 to accommodate UTA BRT Project construction. Well abandonment activities were conducted
according to WP&B NXK-04.
As of fall 2022, UTA BRT Project construction had progressed to the point that replacement groundwater
monitoring well locations could be proposed. On February 7 and 8, 2023, Stantec oversaw the installation
of replacement groundwater monitoring wells MW-2R, MW-5R, MW-8, and MW-9 and conducted soil
logging and sampling activities. These activities were conducted according to WP&B NXK-05.
Due to the impacts of the UTA BRT project to the property, 7-Eleven ceased operations at this store in July
2023. The convenience store building is currently vacant. Stantec retains environmental access to manage
Release Site NXK.
October 22, 2024
Page 3 of 6
Re: 7-Eleven Store No. 27074 – Quarterly Groundwater Monitoring Report
3185 Harrison Boulevard, Ogden, Utah
Facility ID 1200120, Release Site NXK
Work conducted under WP&Bs NXK-01 through NXK-06 were previously reported to the UDEQ-DERR in
the following reports.
Subsurface Investigation Report, 7-Eleven Store No. 27074, dated December 15, 2020.
UST System Closure and Remedial Excavation Report, 7-Eleven Store No. 27074, dated April 28,
2021.
Quarterly Groundwater Monitoring Report, 7-Eleven Store No. 27074 documents, dated August 2,
2021, November 2, 2021, February 2, 2022, and May 2, 2022.
Monitoring Well Abandonment Report, 7-Eleven Store No. 27074, dated July 8, 2022.
Groundwater Monitoring Well Installation Report, 7-Eleven Store No. 27074, dated March 30, 2023.
Quarterly Groundwater Monitoring Report, 7-Eleven Store No. 27074, dated April 24, 2023.
Quarterly Groundwater Monitoring Report, 7-Eleven Store No. 27074, dated July 24, 2023.
Quarterly Groundwater Monitoring Report, 7-Eleven Store No. 27074, dated October 24, 2023.
Quarterly Groundwater Monitoring Report, 7-Eleven Store No. 27074, dated January 24, 2024.
Quarterly Groundwater Monitoring Report, 7-Eleven Store No. 27074, dated July 23, 2024.
GROUNDWATER MONITORING METHODS
On September 12, 2024, static groundwater levels were gauged to the nearest one hundredth of a foot
using a battery-powered product/water interface probe. Free product was not encountered in any of the
monitoring wells. Monitoring wells MW-1, MW-2R, MW-3, MW-5R, MW-7, MW-8, and MW-9 were sampled
on September 12, 2024.
The pumping rate for each well was determined in the field based on an attempt to limit drawdown within
the well to one foot or less. Parameters were collected using either an AquaTroll 500 equipped with
temperature/ conductivity, potential hydrogen (pH)/oxidation reduction potential (ORP), dissolved oxygen
(DO), and turbidity probes, or a YSI 556 equipped with temperature/conductivity, pH/ORP, and DO probes.
Parameters were recorded on the appropriate time interval necessary to fully replace the volume of the
flow-through cell between readings. Purging continued until three consecutive readings were within the
stabilization conditions detailed in WP&B NXK-07. Purged groundwater was thin spread on the surface
near each well location.
Wells were purged via peristaltic pump and disposable one-quarter inch poly sample tubing. Sample tubing
was disconnected from the flow-through cell prior to sample collection. Groundwater samples were
decanted into five 40-milliliter (mL) glass volatile organic analysis (VOA) containers containing hydrochloric
acid (HCl) preservative. VOAs were filled in a manner to minimize sample volatilization and remove all
headspace. Samples were then labeled with the sample identification, collection date, and time, and placed
into an ice chilled cooler for delivery to the project laboratory under chain-of-custody (COC) documentation.
Stantec also collected/submitted the following quality assurance/quality control (QA/QC) samples.
Blind field duplicate (DUP-01) from MW-2R
Trip blank (TB-20240912)
Samples were submitted for analysis of TPH-GRO and methyl tertiary-butyl ether, benzene, toluene,
ethylbenzene, total xylenes, and naphthalene (MBTEXN) by United States Environmental Protection
Agency (EPA) Method 8260B and TPH-DRO by EPA Method 8015. The trip blank was only analyzed for
October 22, 2024
Page 4 of 6
Re: 7-Eleven Store No. 27074 – Quarterly Groundwater Monitoring Report
3185 Harrison Boulevard, Ogden, Utah
Facility ID 1200120, Release Site NXK
volatile organic compounds (VOCs) by EPA Method 8260B. All analyses were performed by Pace
Analytical National (Pace) located in Mount Juliet, Tennessee. Laboratory report and chain-of-custody
documentation are included as Attachment 1.
GROUNDWATER MONITORING RESULTS
On September 12, 2024, shallow groundwater beneath the Site was measured at depths ranging from
10.31 (MW-2R) to 12.99 (MW-3) feet below top of casing (TOC). Each depth to groundwater measurement
was converted to a relative groundwater elevation using the calculated relative TOC elevation of the
monitoring well. A groundwater elevation contour map is provided as Figure 2.
Isoconcentration maps for dissolved benzene, TPH-GRO, and TPH-DRO are provided as Figure 3,
Figure 4, and Figure 5, respectively. Groundwater analytical results are summarized in Table 1. The third
quarter 2024 field and analytical results are summarized below.
Shallow groundwater beneath the Site appears to flow towards the southwest at a local hydraulic
gradient of approximately 0.06 feet per foot (as estimated between wells MW-5R and MW-7).
Groundwater elevations across the site decreased between the June 2024 and September 2024
monitoring events; the June 2024 groundwater elevations were the highest observed at the Site.
For the groundwater sample collected from MW-1, the dissolved benzene concentration exceeded the
TSL, ethylbenzene and TPH-DRO concentrations exceeded the respective ISLs, and the TPH-GRO
laboratory reporting limit (RL) exceeded the ISL.
For the groundwater sample collected from MW-2R, the dissolved benzene and TPH-DRO
concentrations exceeded the respective ISLs. The TPH-GRO laboratory RL exceeded the ISL;
however, the TPH-GRO laboratory RL for the duplicate was below the ISL.
The dissolved TPH-DRO concentrations in MW-3, MW-7, and MW-8 all remain below the ISL.
Relative percent differences calculated between the MW-2R and DUP-01 sample analytical results
were within generally accepted standards.
No petroleum hydrocarbons were detected at concentrations above laboratory RLs in the trip blank.
All other petroleum hydrocarbon concentrations were either below ISLs or were not detected above
laboratory RLs.
All other laboratory RLs were below the respective ISLs.
OFF-SITE SOURCE DESKTOP STUDY
Stantec reviewed the following data sources for evidence of an off-site petroleum source contributing to the
variable dissolved petroleum hydrocarbon concentrations observed at the Site since the installation of
replacement monitoring wells in the first quarter of 2023:
The UDEQ interactive map (https://enviro.deq.utah.gov/)
The UDEQ spills database for Ogden from January 1, 2021 to December 31, 2023
(https://deqspillsps.deq.utah.gov/s/)
The spills database mapping feature was not working to enable searching within a specified
radius of the Site at the time of preparing this report.
Aerial photographs from 1937 to 2021 (https://www.historicaerials.com/viewer)
October 22, 2024
Page 5 of 6
Re: 7-Eleven Store No. 27074 – Quarterly Groundwater Monitoring Report
3185 Harrison Boulevard, Ogden, Utah
Facility ID 1200120, Release Site NXK
The UDEQ spills database did not document any significant petroleum releases upgradient of the Site. The
UDEQ interactive map did not document any USTs with significant release histories, petroleum related
environmental incidents, voluntary cleanup program sites, CERCLA sites, or brownfields upgradient of the
Site. The June 24, 1994 spill report for Release Site IPT does mention the removed new and used oil USTs
appeared to be in good condition and suggests the impacts observed may be related to previous USTs on
the property. This is further evidenced by the TPH-GRO and TPH-DRO concentrations detected near the
former Minit Lube new and used oil USTs.
Aerial photographs obtained during the desktop study are included in Attachment 2. The earliest aerial
photograph obtained was from 1937 and shows vacant land and dirt roads in the vicinity of the Site. An
aerial photograph from 1958 shows a residence in the vicinity of the Site and a neighborhood to the east
across Harrison Boulevard. An aerial photograph from 1962 documents a previous commercial structure
present at the Site; an addition was built onto the north side of the original structure sometime before 1971.
Based on UST compliance records documented on the UDEQ interactive map for the Site, the current
structure previously occupied by 7-Eleven was likely constructed between 1985 and 1986 when 7-Eleven
began leasing the property and installed USTs. At the time of this report, Stantec has not determined for
certain what the original commercial structure may have been; however, it does resemble an automobile
service station. Regional aerial photography suggests that the historical land use of the areas upgradient
of the Site are similar to the current land use of the upgradient area, namely residential, institutional (schools
and parks), and the Mount Ogden Golf Course.
CONCLUSIONS AND RECOMMENDATIONS
The desktop study performed to date does not indicate a high potential for an off-site source of petroleum
that may be impacting Site conditions. Data gaps still remain as to what the original commercial structure
first observed at the Site as of 1962 was, whether diesel was associated with the operations thereof, or if
any on-site petroleum releases were documented prior to Release Site IPT. Stantec plans to further
investigation these data gaps and include those findings in the groundwater monitoring report for the first
quarter of 2025. Even without a high potential for an off-site petroleum source, a passive soil gas
investigation may be beneficial to guide more targeted future remedial actions.
Recent water table fluctuations may also explain the current dissolved petroleum hydrocarbon
concentration trends at the Site with elevated concentrations corelating to higher groundwater elevation for
source area wells. Site soils consist primarily of silts and clays; therefore, increasing dissolved petroleum
hydrocarbon concentrations could be contributed to the higher groundwater table interacting with petroleum
hydrocarbons entrained in those fine grained sediments. Dissolved petroleum hydrocarbon concentrations
versus time for select wells are shown in the attached Graphs. The groundwater table across the Site has
shown an increasing trend since March 2023; this is the same period of time over which dissolved petroleum
hydrocarbon concentrations have become more variable. More consistent dissolved petroleum
hydrocarbon concentrations may once again be observed after the water table stabilizes following the
maximum conditions observed in June 2024.
LIMITATIONS AND CERTIFICATION
The conclusions in the Report titled 7-Eleven Store No. 27074 – Quarterly Groundwater Monitoring Report
are Stantec’s professional opinion, as of the time of the Report, and concerning the scope described in the
October 22, 2024
Page 6 of 6
Re: 7-Eleven Store No. 27074 – Quarterly Groundwater Monitoring Report
3185 Harrison Boulevard, Ogden, Utah
Facility ID 1200120, Release Site NXK
Report. The opinions in the document are based on conditions and information existing at the time the
scope of work was conducted and do not take into account any subsequent changes. The Report relates
solely to the specific project for which Stantec was retained and the stated purpose for which the Report
was prepared. The Report is not to be used or relied on for any variation or extension of the project, or for
any other project or purpose, and any unauthorized use or reliance is at the recipient’s own risk.
Stantec has assumed all information received from 7-Eleven (the “Client”) and third parties in the
preparation of the Report to be correct. While Stantec has exercised a customary level of judgment or due
diligence in the use of such information, Stantec assumes no responsibility for the consequences of any
error or omission contained therein.
This Report is intended solely for use by the Client in accordance with Stantec’s contract with the Client.
While the Report may be provided by the Client to applicable authorities having jurisdiction and to other
third parties in connection with the project, Stantec disclaims any legal duty based upon warranty, reliance
or any other theory to any third party, and will not be liable to such third party for any damages or losses of
any kind that may result.
If you have any questions or require any additional information, please contact Anna Skinner via the
contact information provided below.
Regards,
Stantec Consulting Services Inc.
Anna Skinner
Project Manager
Certified UST Consultant #CC0271
Phone: (801) 743 4815
anna.skinner@stantec.com
Attachments: Figure 1 Site Plan c. File / 7-Eleven Inc.
Figure 2 Groundwater Elevation Contour Map John Wainwright, Stantec
Figure 3 Dissolved Benzene Isoconcentration Map
Figure 4 Dissolved TPH-GRO Isoconcentration Map
Figure 5 Dissolved TPH-DRO Isoconcentration Map
Table 1 Groundwater Analytical Results
Graph 1 MW-1 Select Concentration vs. Time Graphs
Graph 2 MW-2/2R Select Concentration vs. Time Graphs
Graph 3 MW-3 Select Concentration vs. Time Graphs
Graph 4 MW-5/5R Select Concentration vs. Time Graphs
Graph 5 MW-7 Select Concentration vs. Time Graphs
Graph 6 MW-8 TPH-DRO Concentration vs. Time Graph
Graph 7 MW-9 TPH-DRO Concentration vs. Time Graph
Attachment 1 Laboratory Report and Chain-of-Custody Documentation
Attachment 2 Aerial Photographs
FIGURES
MW-1
MW-3
MW-7
3200 SOUTH
HA
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R
I
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O
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V
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FORMER
CANOPY/
DISPENSERS
CONVENIENCE
STORE
BUILDING
AUTOMOTIVE
SERVICE
FACILITY
T
T
ELEVEN
FORMER
PLANTERPLANTER
UE
UE
UE
UE UE UE UE
UTILITY POLE
STREET LIGHT
PL
A
N
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STORE NO. 27074
FORMER
UST BASIN
FORMER
SIGN
FORMER
PLANTER
FORMER
PLANTER
FORMER
PLANTER
FO
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PL
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MW-6
MW-2
MW-2R
MW-9
MW-8
MW-5R MW-5
MW-4
203721870 STA AMS JPW 03/20/23
1SITE PLANSTORE #27074
3185 HARRISON BOULEVARD
OGDEN, UTAH
FOR:
JOB NUMBER:DRAWN BY:CHECKED BY:APPROVED BY:DATE:
FILEPATH:C:\Users\SAguinaldo\Desktop\2023\SLC\203721870\FIG 2_7-11_27074_SITE PLAN_03-20-2023.dwg | Layout Tab: 1 | Drafter: SAguinaldo | Mar 22, 2023 at 14:43
FIGURE:
No warranty is made by Stantec Consulting Services Inc. as to the accuracy, reliability, or completeness of these data. Original data were
compiled from various sources. This information may not meet National Map Accuracy Standards. This product was developed
electronically, and may be updated without notification. Any reproduction may result in a loss of scale and or information.
N
ELEVEN
PHONE:
2890 E COTTONWOOD PKWY, STE 300
SALT LAKE CITY, UTAH
(801) 261-0090
LEGEND
T
UE
MONITORING WELL LOCATION
TELEPHONE LINE
GAS LINE
OVERHEAD ELECTRICAL LINE
BELOW GROUND ELECTRICAL LINE
WATER LINE
0 30 60
APPROXIMATE SCALE IN FEET
ABANDONED MONITORING WELL LOCATION
3200 SOUTH
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CONVENIENCE
STORE
BUILDING
AUTOMOTIVE
SERVICE
FACILITY
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UE UE UE UE
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STORE NO. 27074
FORMER
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FO
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PL
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MW-6
MW-2
MW-5
MW-4
MW-2R
87.26
MW-9
87.54
MW-8
84.49
MW-5R
88.18
MW-7
82.58
MW-1
87.01MW-3
84.54
203721870 STA AMS AWA 10/22/24
2STORE #27074
3185 HARRISON BOULEVARD
OGDEN, UTAH
FOR:
JOB NUMBER:DRAWN BY:CHECKED BY:APPROVED BY:DATE:
FILEPATH:C:\Users\SAguinaldo\Desktop\2024\SLC\203721870\3Q 2024\FIG 2_7-11_27074_GWE CONTOUR MAP.dwg | Layout Tab: 2 | Drafter: SAguinaldo | Oct 22, 2024 at 14:38
FIGURE:
No warranty is made by Stantec Consulting Services Inc. as to the accuracy, reliability, or completeness of these data. Original data were
compiled from various sources. This information may not meet National Map Accuracy Standards. This product was developed
electronically, and may be updated without notification. Any reproduction may result in a loss of scale and or information.
N
ELEVEN
PHONE:
2890 E COTTONWOOD PKWY, STE 300
SALT LAKE CITY, UTAH
(801) 261-0090
LEGEND
T
UE
MONITORING WELL LOCATION
TELEPHONE LINE
GAS LINE
OVERHEAD ELECTRICAL LINE
BELOW GROUND ELECTRICAL LINE
WATER LINE
ELEVEN
0 30 60
APPROXIMATE SCALE IN FEET
ABANDONED MONITORING WELL LOCATION
GROUNDWATER ELEVATION
CONTOUR MAP
SEPTEMBER 12, 2024
87.01 GROUNDWATER SURFACE ELEVATION
(FEET ABOVE MEAN SEA LEVEL)
GROUNDWATER ELEVATION CONTOUR
(DASHED WHERE INFERRED)84
8
4
8
5
8
6
87
88
88
87
8
6
8
5
83
8
4
83
3200 SOUTH
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STORE
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AUTOMOTIVE
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FACILITY
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STORE NO. 27074
FORMER
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MW-6
MW-2
MW-5
MW-4
MW-2R
0.0543
MW-9
<0.00100
MW-8
<0.00100
MW-5R
<0.00100
MW-7
<0.00100
MW-3
<0.00100
203721870 STA AMS AWA 10/22/24
3STORE #27074
3185 HARRISON BOULEVARD
OGDEN, UTAH
FOR:
JOB NUMBER:DRAWN BY:CHECKED BY:APPROVED BY:DATE:
FILEPATH:C:\Users\SAguinaldo\Desktop\2024\SLC\203721870\3Q 2024\FIG 3_7-11_27074_BENZENE MAP.dwg | Layout Tab: 3 | Drafter: SAguinaldo | Oct 22, 2024 at 14:45
FIGURE:
No warranty is made by Stantec Consulting Services Inc. as to the accuracy, reliability, or completeness of these data. Original data were
compiled from various sources. This information may not meet National Map Accuracy Standards. This product was developed
electronically, and may be updated without notification. Any reproduction may result in a loss of scale and or information.
N
ELEVEN
PHONE:
2890 E COTTONWOOD PKWY, STE 300
SALT LAKE CITY, UTAH
(801) 261-0090
LEGEND
T
UE
MONITORING WELL LOCATION
TELEPHONE LINE
GAS LINE
OVERHEAD ELECTRICAL LINE
BELOW GROUND ELECTRICAL LINE
WATER LINE
ELEVEN
0 30 60
APPROXIMATE SCALE IN FEET
ABANDONED MONITORING WELL LOCATION
DISSOLVED BENZENE
ISOCONCENTRATION MAP
SEPTEMBER 12, 2024
0.462 DISSOLVED BENZENE CONCENTRATION
MILLIGRAMS PER LITER (mg/L)
INFERRED BENZENE ISOCONCENTRATION CONTOUR (mg/L)0.005
<ANALYTE NOT DETECTED ABOVE THE SPECIFIED LABORATORY REPORTING LIMIT
0.005
0.0
0
5
ELEVEN
0.462
0.3
MW-1
3200 SOUTH
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MW-6
MW-2
MW-5
MW-4
MW-2R
<5.00
MW-9
<0.500
MW-8
<0.500
MW-5R
<0.500
MW-7
0.766
MW-1
<5.00MW-3
<0.500
203721870 STA AMS AWA 10/22/24
4STORE #27074
3185 HARRISON BOULEVARD
OGDEN, UTAH
FOR:
JOB NUMBER:DRAWN BY:CHECKED BY:APPROVED BY:DATE:
FILEPATH:C:\Users\SAguinaldo\Desktop\2024\SLC\203721870\3Q 2024\FIG 4_7-11_27074_GRO ISOCON MAP.dwg | Layout Tab: 4 | Drafter: SAguinaldo | Oct 22, 2024 at 14:58
FIGURE:
No warranty is made by Stantec Consulting Services Inc. as to the accuracy, reliability, or completeness of these data. Original data were
compiled from various sources. This information may not meet National Map Accuracy Standards. This product was developed
electronically, and may be updated without notification. Any reproduction may result in a loss of scale and or information.
N
ELEVEN
PHONE:
2890 E COTTONWOOD PKWY, STE 300
SALT LAKE CITY, UTAH
(801) 261-0090
LEGEND
T
UE
MONITORING WELL LOCATION
TELEPHONE LINE
GAS LINE
OVERHEAD ELECTRICAL LINE
BELOW GROUND ELECTRICAL LINE
WATER LINE 0 30 60
APPROXIMATE SCALE IN FEET
ABANDONED MONITORING WELL LOCATION
DISSOLVED TPH-GRO
ISOCONCENTRATION MAP
SEPTEMBER 12, 2024
0.766 DISSOLVED TPH-GRO CONCENTRATION
MILLIGRAMS PER LITER (mg/L)
INFERRED TPH-GRO ISOCONCENTRATION CONTOUR (mg/L)1
<ANALYTE NOT DETECTED ABOVE THE SPECIFIED LABORATORY REPORTING LIMIT
ELEVEN
1
3200 SOUTH
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AUTOMOTIVE
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FACILITY
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STORE NO. 27074
FORMER
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E
R
PL
A
N
T
E
R
MW-6
MW-2
MW-5
MW-2R
4.86
MW-9
0.432
MW-8
0.231
MW-5R
0.331
MW-7
0.870
MW-1
8.07
MW-3
0.822
MW-4
203721870 STA AMS AWA 10/22/24
5STORE #27074
3185 HARRISON BOULEVARD
OGDEN, UTAH
FOR:
JOB NUMBER:DRAWN BY:CHECKED BY:APPROVED BY:DATE:
FILEPATH:C:\Users\SAguinaldo\Desktop\2024\SLC\203721870\3Q 2024\FIG 5_7-11_27074_DRO ISOCON MAP.dwg | Layout Tab: 5 | Drafter: SAguinaldo | Oct 22, 2024 at 15:05
FIGURE:
No warranty is made by Stantec Consulting Services Inc. as to the accuracy, reliability, or completeness of these data. Original data were
compiled from various sources. This information may not meet National Map Accuracy Standards. This product was developed
electronically, and may be updated without notification. Any reproduction may result in a loss of scale and or information.
N
ELEVEN
PHONE:
2890 E COTTONWOOD PKWY, STE 300
SALT LAKE CITY, UTAH
(801) 261-0090
LEGEND
T
UE
MONITORING WELL LOCATION
TELEPHONE LINE
GAS LINE
OVERHEAD ELECTRICAL LINE
BELOW GROUND ELECTRICAL LINE
WATER LINE 0 30 60
APPROXIMATE SCALE IN FEET
ABANDONED MONITORING WELL LOCATION
DISSOLVED TPH-DRO
ISOCONCENTRATION MAP
SEPTEMBER 12, 2024
8.07 DISSOLVED TPH-DRO CONCENTRATION
MILLIGRAMS PER LITER (mg/L)
INFERRED TPH-DRO ISOCONCENTRATION CONTOUR (mg/L)1
<ANALYTE NOT DETECTED ABOVE THE SPECIFIED LABORATORY REPORTING LIMIT
ELEVEN
1
TABLE
MTBE
11/12/20 12.64 85.03 <0.0100 0.321 <0.0100 0.646 0.143 0.116 1.97 3.68
06/24/21 13.22 84.45 <0.00250 0.0806 <0.00250 0.370 0.0588 0.0124 1.80 0.954
10/06/21 14.34 83.33 <0.00200 0.0549 <0.00200 0.261 0.0785 0.0159 1.86 0.634
12/20/21 14.78 82.89 <0.00100 0.0320 <0.00100 0.139 0.0357 0.00708 0.898 0.430 1
03/24/22 15.52 82.15 <0.00114 0.0447 <0.00114 0.138 0.0344 <0.00571 <0.571 0.656
03/09/23 14.45 83.22 <0.00100 0.00998 <0.00100 0.0377 0.0102 <0.00500 <0.500 0.895
06/07/23 12.27 85.40 <0.00100 0.00723 <0.00100 0.0259 0.00382 <0.00500 0.501 B 0.745
09/14/23 13.12 84.55 <0.00100 0.0129 <0.00100 0.205 0.0359 0.0379 <0.500 4.78
12/15/23 13.22 84.45 <0.0100 0.0117 <0.0100 0.187 0.0304 <0.0500 <5.00 <0.100 ~
06/27/24 10.48 87.19 <0.0100 0.117 <0.0100 0.932 <0.0300 0.0590 J3 5.52 B 9.40
09/12/24 10.66 87.01 <0.0100
0.462 0.0386 1.97 0.352 0.325
J4 <5.00 8.07
11/12/20 12.35 85.03 <0.00250 0.153 0.00437 0.294 0.0440 0.0558 0.846 1.15
06/24/21 13.04 84.34 <0.00500 0.235 <0.00500 0.489 0.0196 0.0818 2.08 1.37
10/06/21 14.09 83.29 <0.0500 0.783 0.124 2.62 2.35 0.476 18.8 5.44
12/20/21 14.22 83.16 <0.0500 0.414 <0.0500 3.17 1.50 0.699 16.2 6.24
03/24/22 15.04 82.34 <0.00114
0.963 0.0282 2.21 0.637 <0.571 4.19 5.77
03/10/23 14.28 83.29 <0.0100
0.540 <0.0100 1.36 0.0738 0.0804 <5.00 8.12
06/07/23 12.26 85.31 <0.0100
0.745 0.0128 1.19 0.361 0.107
5.39 11.3
09/14/23 13.03 84.54 <0.0100
0.305 0.0377 1.18 2.18 0.250
6.17 4.31
12/15/23 13.08 84.49 <0.0100
0.364 0.0240 1.59 3.67 0.580
10.5 <0.100 ~
06/27/24 10.22 87.35 <0.00505
0.0219 Z1 <0.0500 0.465 0.591 0.132
J3,Z1 25.1 B 1.44
09/12/24 10.31 87.26 <0.01000
0.0543 <0.01000 0.454 0.0572 0.0689 <5.00 4.86
11/12/20 14.73 82.83 <0.000500 0.00294 <0.000500 <0.000500 <0.000500 <0.00100 0.325 0.357
06/24/21 14.98 82.58 <0.000500 0.00752 <0.000500 <0.000500 <0.000500 <0.00100 0.339 0.491
10/06/21 16.01 81.55 <0.000500 <0.000500 <0.000500 <0.000500 <0.000500 <0.00100 0.374 0.423
12/20/21 16.58 80.98 <0.000500 <0.000500 <0.000500 <0.000500 <0.000500 <0.00100 0.108 0.277
1
03/24/22 17.04 80.52 <0.00114 0.00311 <0.00114 <0.00114 <0.00343 <0.00571 <0.571 0.249
03/09/23 15.73 81.80 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.500 0.450
06/06/23 13.10 84.43 <0.00100 0.00271 <0.00100 <0.00100 <0.00300 <0.00500 0.950 1.27 J3
09/14/23 14.16 83.37 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.500 0.786
12/15/23 14.90 82.63 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 0.518 B 5.12 ~
06/26/24 12.36 85.17 <0.00100 0.00221 <0.00100 0.0140 <0.00300 <0.00500
J3 0.616 B 0.786
09/12/24 12.99 84.54 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500
J4 <0.500 0.822
11/12/20 11.66 84.88 <0.0500 2.29 <0.0500 2.20 0.956 0.283 12.5 6.68
06/24/21 12.37 84.17 <0.0100 0.603 <0.0100 0.812 0.270 0.0300 4.65 4.00
10/06/21 13.69 82.85 <0.0100 0.312 <0.0100 0.741 0.199 0.0221 4.80 3.02
12/20/21 13.96 82.58 <0.00500 0.0449 <0.00500 0.437 0.00959 <0.0100 1.79 2.72
03/24/22 14.86 81.68 <0.00114
0.00768 <0.00114 0.134 <0.00343 <0.00571 <0.571 1.25
11/12/20 13.33 86.06 <0.000500 <0.000500 <0.000500 <0.000500 <0.000500 <0.00100 0.260 0.0515
06/24/21 14.07 85.32 <0.000500 <0.000500 <0.000500 <0.000500 <0.000500 <0.00100 0.178 <0.0517
10/06/21 15.36 84.03 <0.000500 <0.000500 <0.000500 <0.000500 <0.000500 <0.00100 0.298 0.0785
12/20/21 16.15 83.24 <0.000500 <0.000500 <0.000500 <0.000500 <0.000500 <0.00100 0.328 <0.0523
03/24/22 16.90 82.49 <0.00114 <0.00114 <0.00114 <0.00114 <0.00343 <0.00571 <0.571 <0.114
03/10/23 16.18 83.34 <0.00100 <0.00100 <0.00100 0.0173 0.142 0.00877 0.513 1.48
06/07/23 13.26 86.26 <0.00100 <0.00100 <0.00100 0.00778 0.0236 0.00758 0.574 1.80
09/14/23 14.07 85.45 <0.00100 <0.00100 <0.00100 0.00585 0.0297 0.0213 <0.500 1.17
12/15/23 14.35 85.17 <0.00100 <0.00100 <0.00100 0.00164 0.00481 <0.00500 <0.500 <0.100
~
06/26/24 10.77 88.75 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500
J3 <0.500 0.467
09/12/24 11.34 88.18 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500
J4 <0.500 0.331
11/12/20 14.66 85.34 <0.000500 <0.000500 <0.000500 <0.000500 <0.000500 <0.00100 <0.0500 <0.0476
06/24/21 15.30 84.70 <0.000500 <0.000500 <0.000500 <0.000500 <0.000500 <0.00100 <0.0500 <0.0509
10/06/21 16.36 83.64 <0.000500 <0.000500 <0.000500 <0.000500 <0.000500 <0.00100 <0.0500 <0.0537
12/20/21 16.70 83.30 <0.000500 <0.000500 <0.000500 <0.000500 <0.000500 <0.00100 <0.0500 <0.0510
03/24/22 17.24 82.76 <0.00114 <0.00114 <0.00114 <0.00114 <0.00343 <0.00571 <0.571 <0.114
0.2 0.005 1.0 0.7 10.0 0.7 1.0 1.0
0.2 0.3 3.0 4.0 10.0 0.7 10 10
Naphthalene
MW-1
MW-2#
MW-3
UDEQ DERR Initial Screening Level
MW-5R
MW-2R
UDEQ DERR Tier 1 Screening Level
MW-4#
MW-5#
MW-6#
Groundwater Analytical Results
Table 1
3185 Harrison Boulevard, Ogden, Utah
7-Eleven Store No. 27074
Sample
Location Date
Depth to
Groundwater
(feet)
Relative
Groundwater
Elevation
(feet)
TPH-DRO
(mg/L)Total Xylenes Ethylbenzene
TPH-GRO
(mg/L)TolueneBenzene
MBTEXN Compounds
(mg/L)
fnl_dbs_27074_20240912.xlsb Water 1 of 3 Stantec Consulting Services Inc.
MTBE Naphthalene
Groundwater Analytical Results
Table 1
3185 Harrison Boulevard, Ogden, Utah
7-Eleven Store No. 27074
Sample
Location Date
Depth to
Groundwater
(feet)
Relative
Groundwater
Elevation
(feet)
TPH-DRO
(mg/L)Total Xylenes Ethylbenzene
TPH-GRO
(mg/L)TolueneBenzene
MBTEXN Compounds
(mg/L)
11/12/20 14.05 81.02 <0.000500 <0.000500 <0.000500 <0.000500 <0.000500 <0.00100 0.386 0.433
06/24/21 14.28 80.79 <0.000500 <0.000500 <0.000500 <0.000500 <0.000500 <0.00100 0.428 0.381
10/06/21 15.08 79.99 <0.000500 <0.000500 <0.000500 <0.000500 <0.000500 <0.00100 0.536 0.371
12/20/21 15.43 79.64 <0.000500 <0.000500 <0.000500 <0.000500 <0.000500 <0.00100 0.693 0.479
1
03/24/22 15.79 79.28 <0.00114 <0.00114 <0.00114 <0.00114 <0.00343 <0.00571 0.856 0.458
03/09/23 14.75 80.25 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 0.855 1.24
06/07/23 12.11 82.89 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 0.829 1.09 J3
09/13/23 12.81 82.19 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.500 1.06
12/15/23 13.84 81.16 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 0.708 B 6.14 ~
06/26/24 11.76 83.24 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500
J3 0.896 B 0.872
09/12/24 12.42 82.58 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500
J4 0.766 0.870
03/10/23 14.98 81.29 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.500 <0.100
06/06/23 12.60 83.67 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.500 0.258 J3
09/13/23 13.23 83.04 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.500 0.191
12/15/23 13.90 82.37 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.500 416 J7,~
06/26/24 11.28 84.99 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500
J3 <0.500 0.125
09/12/24 11.78 84.49 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500
J4 <0.500 0.231
03/10/23 15.05 83.60 <0.00100 <0.00100 <0.00100 0.0132 <0.00300 <0.00500 <0.500 1.56
06/07/23 13.22 85.43 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.500 0.661
09/13/23 13.93 84.72 <0.00100 <0.00100 <0.00100 0.00785 0.0295 0.00805 <0.500 0.354
12/15/23 14.03 84.62 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.500 0.406 ~
06/26/24 11.08 87.57 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500
J3 <0.500 0.413
09/12/24 11.11 87.54 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500
J4 <0.500 0.432
FD-1 (MW-2)06/24/21 -- --<0.00200 0.0557 <0.00200 0.261 0.0407 0.00665 1.25 0.954
RPD (%)-- -- -- --123 --61 70 170 50 36
FD-1 (MW-2)12/20/21 -- --<0.0500 0.533 <0.0500 3.09 1.41 0.832 14.4 5.32
RPD (%)-- -- ---- 25 -- 3 6 17 12 16
FD-1 (MW-2)03/24/22 -- --<0.00114 0.888 0.0282 2.06 0.735 0.203 4.08 5.68
RPD (%)-- -- ---- 8 0 7 14 -- 3 2
DUP-01 (MW-2R)03/10/23 -- --<0.00100 0.630 0.00531 1.47 0.0779 0.0602
Z1 2.03 7.10
RPD (%)-- -- ---- 15 -- 8 5 29 -- 13
DUP-01 (MW-2R)06/07/23 -- --<0.0500 0.784 <0.0500 1.33 0.366 <0.250 <25.0 12.1
RPD (%)-------- 174 --98 146 ----85
DUP-01 (MW-2R)09/14/23 -- --<0.0500 0.243 0.0470 Q 1.05 1.77 0.251
12.50 Q 1.11
RPD (%)-- -- ---- 127 130 79 187 113.85 86 126
DUP-01 (MW-2R)12/15/23 -- --<0.00100 0.338 Q,J2 0.0190 J2 1.36 Q,J2 3.00 Q,J2 0.405 10.8 2.97 ~
RPD (%)-- -- ---- 145 62 100 193 142 73 --
DUP-01 (MW-2R)06/27/24 -- --<0.00100 0.0328 0.00231 0.512
Q 0.662 Q 0.185 J3 4.02 B 2.75
RPD (%)-- -- ---- 167 -- 103 139 103 89 186
DUP-01 (MW-2R)09/12/24 -- --<0.00100 0.0460 0.00367 0.420 0.0496 0.0704 <0.500 4.09
RPD (%)-- -- ---- 17 -- 8 14 2 -- 17
0.2 0.005 1.0 0.7 10.0 0.7 1.0 1.0
0.2 0.3 3.0 4.0 10.0 0.7 10 10
Well ID
UDEQ DERR Tier 1 Screening Level
UDEQ DERR Initial Screening Level
Q,Z1,J
2
MW-9
MW-8
MW-7
MW-5R
MW-3
MW-2R
MW-1
MW-9
MW-8
MW-7
20
20
20
20
20
5 to 20
5 to 20
5 to 20
5 to 20
5 to 20
98.65
96.27
95.00
99.52
97.53
Elevation*
Screened
Interval
(feet)
Total Well
Depth
(feet)
5 to 20
5 to 20
97.57
97.67
Relative Top
(feet)
of Casing
20
20
fnl_dbs_27074_20240912.xlsb Water 2 of 3 Stantec Consulting Services Inc.
Groundwater Analytical Results
Table 1
3185 Harrison Boulevard, Ogden, Utah
7-Eleven Store No. 27074
Explanation of Abbreviations
DERR = Department of Environmental Response and Remediation
MBTEXN = methyl tertiary-butyl ether, benzene, toluene, ethylbenzene, total xylenes,
and naphthalene
mg/L = milligrams per liter
MTBE = methyl tertiary-butyl ether
RPD = relative percent difference
TPH-DRO = total petroleum hydrocarbons as diesel-range organics
TPH-GRO = total petroleum hydrocarbons as gasoline-range organics
UDEQ = Utah Department of Environmental Quality
-- = no data
< = analyte not detected above the specified laboratory reporting limit
bold = analyte detected above the specified laboratory reporting limit
bold = analytical result exceeds the specified UDEQ DERR Initial Screening Level
bold = analytical result exceeds the specified UDEQ DERR Initial Screening Level and Tier 1 Screening Level
* = For the original survey data, MW-6 was assigned an arbitrary TOC elevation of 100 feet, and the TOC elevations of the remaining wells
were calculated according to that datum. All wells were re-surveyed on March 9, 2023, and MW-1 was assigned an arbitrary TOC
elevation of 97.67 feet (which was the original calculated relative TOC elevation for MW-1).
#= Wells were abandoned on April 8, 2022 to accommodate UTA construction along Harrison Boulevard. Replacement wells were installed
on February 7 and 8, 2023.
~= The same analyte is found in the field blank.
1 = Laboratory method blank detected TPH-DRO for original analysis. Repeat analysis was completed outside of hold time. Repeat analysis
result was higher than original. Repeat analysis result is reported in table.
B = The same analyte is found in the associated blank.
J2 = Surrogate recovery limits have been exceeded; values are outside lower control limits.
J3 = The associated batch QC was outside the established quality control range for precision.
J4 = The associated batch QC was outside the established quality control range for accuracy.
J7 = Surrogate recovery cannot be used for control limit evaluation due to dilution.
Q = Sample was prepared and/or analyzed past holding time as defined in the method. Concentrations should beconsidered minimum values.
Z1 = The identification of the analyte is acceptable; the reported value is an estimate.
Notes
▪March 24, 2022 samples were collected into 40 mL vials that contained 5 mL of methanol. Reported concentrations include a 40/35 dilution
factor.
▪The first quarter 2023 groundwater monitoring and sampling event was conducted on March 9 and 10. All depth to water measurements were
collected on March 9.
▪The second quarter 2023 groundwater monitoring and sampling event was conducted on June 6 and 7. All depth to water measurements were
collected on June 6.
▪The third quarter 2023 groundwater monitoring and sampling event was conducted on September 13 and 14. All depth to water measurements were
collected on September 13.
▪The second quarter 2024 groundwater monitoring and sampling event was conducted on June 26 and 27. All depth to water measurements were
collected on June 26.
fnl_dbs_27074_20240912.xlsb Water 3 of 3 Stantec Consulting Services Inc.
GRAPHS
GRAPH 1A
7-Eleven Store No. 27074
MW-1 Benzene Concentration vs. Time
GRAPH 1B
7-Eleven Store No. 27074
MW-1 Ethylebenzene Concentration vs. Time
GRAPH 1
MW-1 Select Concentration vs. Time Graphs
10
11
12
13
14
15
160.001
0.010
0.100
1.000
No
v
-
2
0
Fe
b
-
2
1
Ma
y
-
2
1
Au
g
-
2
1
No
v
-
2
1
Fe
b
-
2
2
Ma
y
-
2
2
Au
g
-
2
2
No
v
-
2
2
Fe
b
-
2
3
Ma
y
-
2
3
Au
g
-
2
3
No
v
-
2
3
Fe
b
-
2
4
Ma
y
-
2
4
Au
g
-
2
4
De
p
t
h
t
o
G
r
o
u
n
d
w
a
t
e
r
(
f
e
e
t
)
Co
n
c
e
n
t
r
a
t
i
o
n
(
m
g
/
L
)
DATE
ISL TSL Benzene Depth to Groundwater
10
11
12
13
14
15
160.01
0.10
1.00
10.00
No
v
-
2
0
Fe
b
-
2
1
Ma
y
-
2
1
Au
g
-
2
1
No
v
-
2
1
Fe
b
-
2
2
Ma
y
-
2
2
Au
g
-
2
2
No
v
-
2
2
Fe
b
-
2
3
Ma
y
-
2
3
Au
g
-
2
3
No
v
-
2
3
Fe
b
-
2
4
Ma
y
-
2
4
Au
g
-
2
4
De
p
t
h
t
o
G
r
o
u
n
d
w
a
t
e
r
(
f
e
e
t
)
Co
n
c
e
n
t
r
a
t
i
o
n
(
m
g
/
L
)
DATE
ISL TSL Ethylbenzene Depth to Groundwater
GRAPH 1C
7-Eleven Store No. 27074
MW-1 TPH-GRO Concentration vs. Time
10
11
12
13
14
15
160.1
1.0
10.0
No
v
-
2
0
Fe
b
-
2
1
Ma
y
-
2
1
Au
g
-
2
1
No
v
-
2
1
Fe
b
-
2
2
Ma
y
-
2
2
Au
g
-
2
2
No
v
-
2
2
Fe
b
-
2
3
Ma
y
-
2
3
Au
g
-
2
3
No
v
-
2
3
Fe
b
-
2
4
Ma
y
-
2
4
Au
g
-
2
4
De
p
t
h
t
o
G
r
o
u
n
d
w
a
t
e
r
(
f
e
e
t
)
Co
n
c
e
n
t
r
a
t
i
o
n
(
m
g
/
L
)
DATE
GRAPH 1D
7-Eleven Store No. 27074
MW-1 TPH-DRO Concentration vs. Time
ISL TSL TPH-DRO Depth to Groundwater
10
11
12
13
14
15
160.1
1.0
10.0
No
v
-
2
0
Fe
b
-
2
1
Ma
y
-
2
1
Au
g
-
2
1
No
v
-
2
1
Fe
b
-
2
2
Ma
y
-
2
2
Au
g
-
2
2
No
v
-
2
2
Ja
n
-
2
3
Ma
y
-
2
3
Ju
l
-
2
3
Oc
t
-
2
3
Ja
n
-
2
4
Ap
r
-
2
4
Ju
l
-
2
4
De
p
t
h
t
o
G
r
o
u
n
d
w
a
t
e
r
(
f
e
e
t
)
Co
n
c
e
n
t
r
a
t
i
o
n
(
m
g
/
L
)
DATE
ISL TSL TPH-GRO Depth to Groundwater
GRAPH 2A
7-Eleven Store No. 27074
MW-2/2R Benzene Concentration vs. Time
GRAPH 2B
7-Eleven Store No. 27074
MW-2/2R Ethylebenzene Concentration vs. Time
GRAPH 2
MW-2/2R Select Concentration vs. Time Graphs
10
11
12
13
14
15
0.001
0.010
0.100
1.000
No
v
-
2
0
Fe
b
-
2
1
Ma
y
-
2
1
Au
g
-
2
1
No
v
-
2
1
Fe
b
-
2
2
Ma
y
-
2
2
Au
g
-
2
2
No
v
-
2
2
Fe
b
-
2
3
Ma
y
-
2
3
Au
g
-
2
3
No
v
-
2
3
Fe
b
-
2
4
Ma
y
-
2
4
Au
g
-
2
4
De
p
t
h
t
o
G
r
o
u
n
d
w
a
t
e
r
(
f
e
e
t
)
Co
n
c
e
n
t
r
a
t
i
o
n
(
m
g
/
L
)
DATE
ISL TSL Benzene Depth to Groundwater
*Closed markers indicate MW-2R data.
10
11
12
13
14
15
0.1
1.0
10.0
No
v
-
2
0
Fe
b
-
2
1
Ma
y
-
2
1
Au
g
-
2
1
No
v
-
2
1
Fe
b
-
2
2
Ma
y
-
2
2
Au
g
-
2
2
No
v
-
2
2
Fe
b
-
2
3
Ma
y
-
2
3
Au
g
-
2
3
No
v
-
2
3
Fe
b
-
2
4
Ma
y
-
2
4
Au
g
-
2
4
De
p
t
h
t
o
G
r
o
u
n
d
w
a
t
e
r
(
f
e
e
t
)
Co
n
c
e
n
t
r
a
t
i
o
n
(
m
g
/
L
)
DATE
ISL TSL Ethylbenzene Depth to Groundwater
*Closed markers indicate MW-2R data.
GRAPH 2C
7-Eleven Store No. 27074
MW-2/2R TPH-GRO Concentration vs. Time
10
11
12
13
14
15
0.1
1.0
10.0
100.0
No
v
-
2
0
Fe
b
-
2
1
Ma
y
-
2
1
Au
g
-
2
1
No
v
-
2
1
Fe
b
-
2
2
Ma
y
-
2
2
Au
g
-
2
2
No
v
-
2
2
Fe
b
-
2
3
Ma
y
-
2
3
Au
g
-
2
3
No
v
-
2
3
Fe
b
-
2
4
Ma
y
-
2
4
Au
g
-
2
4
De
p
t
h
t
o
G
r
o
u
n
d
w
a
t
e
r
(
f
e
e
t
)
Co
n
c
e
n
t
r
a
t
i
o
n
(
m
g
/
L
)
DATE
GRAPH 2D
7-Eleven Store No. 27074
MW-2/2R TPH-DRO Concentration vs. Time
ISL TSL TPH-DRO Depth to Groundwater
*Closed markers indicate MW-2R data.
10
11
12
13
14
15
0.1
1.0
10.0
100.0
No
v
-
2
0
Fe
b
-
2
1
Ma
y
-
2
1
Au
g
-
2
1
No
v
-
2
1
Fe
b
-
2
2
Ma
y
-
2
2
Au
g
-
2
2
No
v
-
2
2
Ja
n
-
2
3
Ma
y
-
2
3
Ju
l
-
2
3
Oc
t
-
2
3
Ja
n
-
2
4
Ap
r
-
2
4
Ju
l
-
2
4
De
p
t
h
t
o
G
r
o
u
n
d
w
a
t
e
r
(
f
e
e
t
)
Co
n
c
e
n
t
r
a
t
i
o
n
(
m
g
/
L
)
DATE
ISL TSL TPH-GRO Depth to Groundwater
*Closed markers indicate MW-2R data.
DUP-01 data used to plot 03/10/23 and 9/12/24 results.
GRAPH 3A
7-Eleven Store No. 27074
MW-3 Benzene Concentration vs. Time
GRAPH 3B
7-Eleven Store No. 27074
MW-3 TPH-GRO Concentration vs. Time
GRAPH 3C
7-Eleven Store No. 27074
MW-3 TPH-DRO Concentration vs. Time
GRAPH 3
MW-3 Select Concentration vs. Time Graphs
12
13
14
15
16
17
0.0001
0.0010
0.0100
0.1000
1.0000
Ju
l
-
2
0
Oc
t
-
2
0
Ja
n
-
2
1
Ap
r
-
2
1
Ju
l
-
2
1
Oc
t
-
2
1
Ja
n
-
2
2
Ap
r
-
2
2
Ju
l
-
2
2
Oc
t
-
2
2
Ja
n
-
2
3
Ap
r
-
2
3
Ju
l
-
2
3
Oc
t
-
2
3
Ja
n
-
2
4
Ap
r
-
2
4
Ju
l
-
2
4
Se
p
-
2
4
De
p
t
h
t
o
G
r
o
u
n
d
w
a
t
e
r
(
f
e
e
t
)
Co
n
c
e
n
t
r
a
t
i
o
n
(
m
g
/
L
)
DATE
ISL TSL Benzene Depth to Groundwater
12
13
14
15
16
17
0.1
1.0
10.0
No
v
-
2
0
Fe
b
-
2
1
Ma
y
-
2
1
Au
g
-
2
1
No
v
-
2
1
Fe
b
-
2
2
Ma
y
-
2
2
Au
g
-
2
2
No
v
-
2
2
Ja
n
-
2
3
Ma
y
-
2
3
Ju
l
-
2
3
Oc
t
-
2
3
Ja
n
-
2
4
Ap
r
-
2
4
Ju
l
-
2
4
De
p
t
h
t
o
G
r
o
u
n
d
w
a
t
e
r
(
f
e
e
t
)
Co
n
c
e
n
t
r
a
t
i
o
n
(
m
g
/
L
)
DATE
ISL TSL TPH-GRO Depth to Groundwater
12
13
14
15
16
17
0.1
1.0
10.0
No
v
-
2
0
Fe
b
-
2
1
Ma
y
-
2
1
Au
g
-
2
1
No
v
-
2
1
Fe
b
-
2
2
Ma
y
-
2
2
Au
g
-
2
2
No
v
-
2
2
Fe
b
-
2
3
Ma
y
-
2
3
Au
g
-
2
3
No
v
-
2
3
Fe
b
-
2
4
Ma
y
-
2
4
Au
g
-
2
4
De
p
t
h
t
o
G
r
o
u
n
d
w
a
t
e
r
(
f
e
e
t
)
Co
n
c
e
n
t
r
a
t
i
o
n
(
m
g
/
L
)
DATE
ISL TSL TPH-DRO Depth to Groundwater
GRAPH 4A
7-Eleven Store No. 27074
MW-5/5R TPH-GRO Concentration vs. Time
GRAPH 4A
7-Eleven Store No. 27074
MW-5/5R TPH-DRO Concentration vs. Time
GRAPH 4
MW-5/5R Select Concentration vs. Time Graphs
10
11
12
13
14
15
16
170.1
1.0
10.0
No
v
-
2
0
Fe
b
-
2
1
Ma
y
-
2
1
Au
g
-
2
1
No
v
-
2
1
Fe
b
-
2
2
Ma
y
-
2
2
Au
g
-
2
2
No
v
-
2
2
Ja
n
-
2
3
Ma
y
-
2
3
Ju
l
-
2
3
Oc
t
-
2
3
Ja
n
-
2
4
Ap
r
-
2
4
Ju
l
-
2
4
De
p
t
h
t
o
G
r
o
u
n
d
w
a
t
e
r
(
f
e
e
t
)
Co
n
c
e
n
t
r
a
t
i
o
n
(
m
g
/
L
)
DATE
ISL TSL TPH-GRO Depth to Groundwater
*Closed markers indicate MW-5R data.
10
11
12
13
14
15
16
170.01
0.10
1.00
10.00
No
v
-
2
0
Fe
b
-
2
1
Ma
y
-
2
1
Au
g
-
2
1
No
v
-
2
1
Fe
b
-
2
2
Ma
y
-
2
2
Au
g
-
2
2
No
v
-
2
2
Ja
n
-
2
3
Ma
y
-
2
3
Ju
l
-
2
3
Oc
t
-
2
3
Ja
n
-
2
4
Ap
r
-
2
4
Ju
l
-
2
4
De
p
t
h
t
o
G
r
o
u
n
d
w
a
t
e
r
(
f
e
e
t
)
Co
n
c
e
n
t
r
a
t
i
o
n
(
m
g
/
L
)
DATE
ISL TSL TPH-DRO Depth to Groundwater
*Closed markers indicate MW-5R data.
GRAPH 5A
7-Eleven Store No. 27074
MW-7 TPH-GRO Concentration vs. Time
GRAPH 5B
7-Eleven Store No. 27074
MW-7 TPH-DRO Concentration vs. Time
GRAPH 5
MW-7 Select Concentration vs. Time Graphs
11
12
13
14
15
160.1
1.0
10.0
No
v
-
2
0
Fe
b
-
2
1
Ma
y
-
2
1
Au
g
-
2
1
No
v
-
2
1
Fe
b
-
2
2
Ma
y
-
2
2
Au
g
-
2
2
No
v
-
2
2
Fe
b
-
2
3
Ma
y
-
2
3
Au
g
-
2
3
No
v
-
2
3
Fe
b
-
2
4
Ma
y
-
2
4
Au
g
-
2
4
De
p
t
h
t
o
G
r
o
u
n
d
w
a
t
e
r
(
f
e
e
t
)
Co
n
c
e
n
t
r
a
t
i
o
n
(
m
g
/
L
)
DATE
ISL TSL TPH-GRO Depth to Groundwater
11
12
13
14
15
16
170.1
1.0
10.0
No
v
-
2
0
Fe
b
-
2
1
Ma
y
-
2
1
Au
g
-
2
1
No
v
-
2
1
Fe
b
-
2
2
Ma
y
-
2
2
Au
g
-
2
2
No
v
-
2
2
Fe
b
-
2
3
Ma
y
-
2
3
Au
g
-
2
3
No
v
-
2
3
Fe
b
-
2
4
Ma
y
-
2
4
Au
g
-
2
4
De
p
t
h
t
o
G
r
o
u
n
d
w
a
t
e
r
(
f
e
e
t
)
Co
n
c
e
n
t
r
a
t
i
o
n
(
m
g
/
L
)
DATE
ISL TSL TPH-DRO Depth to Groundwater
GRAPH 6
7-Eleven Store No. 27074
MW-8 TPH-DRO Concentration vs. Time
11
12
13
14
15
160.1
1.0
10.0
100.0
1,000.0
Ma
r
-
2
3
Ju
n
-
2
3
Se
p
-
2
3
De
c
-
2
3
Ma
r
-
2
4
Ju
n
-
2
4
Se
p
-
2
4
De
p
t
h
t
o
G
r
o
u
n
d
w
a
t
e
r
(
f
e
e
t
)
Co
n
c
e
n
t
r
a
t
i
o
n
(
m
g
/
L
)
DATE
ISL TSL TPH-DRO Depth to Groundwater
GRAPH 7
7-Eleven Store No. 27074
MW-9 TPH-DRO Concentration vs. Time
11
12
13
14
15
160.1
1.0
10.0
Ma
r
-
2
3
Ju
n
-
2
3
Se
p
-
2
3
De
c
-
2
3
Ma
r
-
2
4
Ju
n
-
2
4
Se
p
-
2
4
De
p
t
h
t
o
G
r
o
u
n
d
w
a
t
e
r
(
f
e
e
t
)
Co
n
c
e
n
t
r
a
t
i
o
n
(
m
g
/
L
)
DATE
ISL TSL TPH-DRO Depth to Groundwater
ATTACHMENT 1
Laboratory Report and Chain-of-Custody Documentation
ANALYTICAL REPORT
September 28, 2024
711 Stantec - Salt Lake City, UT
Sample Delivery Group:L1777351
Samples Received:09/13/2024
Project Number:203721870
Description:7-11 #27074 Ogden, UT
Site:27074
Report To:Anna Skinner
2890 E Cottonwood Pkwy
Suite 300
Salt Lake City, UT 84121
Entire Report Reviewed By:
September 28, 2024
[Preliminary Report]
Marty Edwards III
Project Manager
Results relate only to the items tested or calibrated and are reported as rounded values. This test report shall not be
reproduced, except in full, without written approval of the laboratory. Where applicable, sampling conducted by Pace
Analytical National is performed per guidance provided in laboratory standard operating procedures ENV-SOP-MTJL-0067 and
ENV-SOP-MTJL-0068. Where sampling conducted by the customer, results relate to the accuracy of the information provided,
and as the samples are received.
Pace Analytical National
12065 Lebanon Rd Mount Juliet, TN 37122 615-758-5858 800-767-5859 mydata.pacelabs.com
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
711 Stantec - Salt Lake City, UT 203721870 L1777351 09/28/24 00:26 1 of 20
September 30, 2024
Marty Edwards III
Project Manager
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
711 Stantec - Salt Lake City, UT 203721870 L1777351 09/30/24 08:06 1 of 20
TABLE OF CONTENTS
Cp: Cover Page 1
Tc: Table of Contents 2
Ss: Sample Summary 3
Cn: Case Narrative 5
Sr: Sample Results 6
MW-1 L1777351-01 6
MW-2R L1777351-02 7
MW-3 L1777351-03 8
MW-5R L1777351-04 9
MW-7 L1777351-05 10
MW-8 L1777351-06 11
MW-9 L1777351-07 12
DUP-01 L1777351-08 13
TB-20240912 L1777351-09 14
Qc: Quality Control Summary 15
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 15
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 17
Gl: Glossary of Terms 18
Al: Accreditations & Locations 19
Sc: Sample Chain of Custody 20
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
711 Stantec - Salt Lake City, UT 203721870 L1777351 09/28/24 00:26 2 of 20
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
711 Stantec - Salt Lake City, UT 203721870 L1777351 09/30/24 08:06 2 of 20
SAMPLE SUMMARY
Collected by Collected date/time Received date/time
MW-1 L1777351-01 GW CF 09/12/24 12:20 09/13/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2362702 10 09/15/24 10:12 09/15/24 10:12 JCP Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2368759 1 09/24/24 18:51 09/26/24 04:01 TJD Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-2R L1777351-02 GW CF 09/12/24 12:15 09/13/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2364897 10 09/19/24 05:07 09/19/24 05:07 DYW Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2368759 1 09/24/24 18:51 09/26/24 04:22 TJD Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-3 L1777351-03 GW CF 09/12/24 11:45 09/13/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2362702 1 09/15/24 06:14 09/15/24 06:14 JCP Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2368759 1 09/24/24 18:51 09/26/24 04:43 TJD Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-5R L1777351-04 GW CF 09/12/24 11:05 09/13/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2362702 1 09/15/24 06:35 09/15/24 06:35 JCP Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2368759 1 09/24/24 18:51 09/26/24 05:03 TJD Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-7 L1777351-05 GW CF 09/12/24 11:25 09/13/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2362702 1 09/15/24 06:56 09/15/24 06:56 JCP Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2368759 1 09/24/24 18:51 09/26/24 05:24 TJD Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-8 L1777351-06 GW CF 09/12/24 10:25 09/13/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2362702 1 09/15/24 07:18 09/15/24 07:18 JCP Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2368759 1 09/24/24 18:51 09/26/24 05:45 TJD Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-9 L1777351-07 GW CF 09/12/24 10:20 09/13/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2362702 1 09/15/24 07:39 09/15/24 07:39 JCP Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2368759 1 09/24/24 18:51 09/26/24 06:05 TJD Mt. Juliet, TN
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
711 Stantec - Salt Lake City, UT 203721870 L1777351 09/28/24 00:26 3 of 20
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
711 Stantec - Salt Lake City, UT 203721870 L1777351 09/30/24 08:06 3 of 20
SAMPLE SUMMARY
Collected by Collected date/time Received date/time
DUP-01 L1777351-08 GW CF 09/12/24 00:00 09/13/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B WG2364897 10 09/19/24 05:28 09/19/24 05:28 DYW Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2362702 1 09/15/24 08:01 09/15/24 08:01 JCP Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2368759 1 09/24/24 18:51 09/26/24 06:26 TJD Mt. Juliet, TN
Collected by Collected date/time Received date/time
TB-20240912 L1777351-09 GW CF 09/12/24 07:00 09/13/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2362702 1 09/15/24 04:04 09/15/24 04:04 JCP Mt. Juliet, TN
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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CASE NARRATIVE
All sample aliquots were received at the correct temperature, in the proper containers, with the
appropriate preservatives, and within method specified holding times, unless qualified or notated within
the report. Where applicable, all MDL (LOD) and RDL (LOQ) values reported for environmental samples
have been corrected for the dilution factor used in the analysis. All Method and Batch Quality Control
are within established criteria except where addressed in this case narrative, a non-conformance form
or properly qualified within the sample results. By my digital signature below, I affirm to the best of my
knowledge, all problems/anomalies observed by the laboratory as having the potential to affect the
quality of the data have been identified by the laboratory, and no information or data have been
knowingly withheld that would affect the quality of the data.
[Preliminary Report]
Marty Edwards III
Project Manager
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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Marty Edwards III
Project Manager
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SAMPLE RESULTS - 01
L1777351
MW-1
Collected date/time: 09/12/24 12:20
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1
Result Qualifier RDL Dilution Analysis Batch
Analyte mg/l mg/l date / time
TPH (GC/MS) Low Fraction ND 5.00 10 09/15/2024 10:12 WG2362702
Benzene 0.462 0.0100 10 09/15/2024 10:12 WG2362702
Toluene 0.0386 0.0100 10 09/15/2024 10:12 WG2362702
Ethylbenzene 1.97 0.0100 10 09/15/2024 10:12 WG2362702
Xylenes, Total 0.352 0.0300 10 09/15/2024 10:12 WG2362702
Methyl tert-butyl ether ND 0.0100 10 09/15/2024 10:12 WG2362702
Naphthalene 0.325 J4 0.0500 10 09/15/2024 10:12 WG2362702
(S) Toluene-d8 109 80.0-120 09/15/2024 10:12 WG2362702
(S) 4-Bromofluorobenzene 110 77.0-126 09/15/2024 10:12 WG2362702
(S) 1,2-Dichloroethane-d4 92.9 70.0-130 09/15/2024 10:12 WG2362702
Semi-Volatile Organic Compounds (GC) by Method 3511/8015
Result Qualifier RDL Dilution Analysis Batch
Analyte mg/l mg/l date / time
TPH (GC/FID) High Fraction 8.07 0.100 1 09/26/2024 04:01 WG2368759
(S) o-Terphenyl 146 52.0-156 09/26/2024 04:01 WG2368759
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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SAMPLE RESULTS - 02
L1777351
MW-2R
Collected date/time: 09/12/24 12:15
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1
Result Qualifier RDL Dilution Analysis Batch
Analyte mg/l mg/l date / time
TPH (GC/MS) Low Fraction ND 5.00 10 09/19/2024 05:07 WG2364897
Benzene 0.0543 0.0100 10 09/19/2024 05:07 WG2364897
Toluene ND 0.0100 10 09/19/2024 05:07 WG2364897
Ethylbenzene 0.454 0.0100 10 09/19/2024 05:07 WG2364897
Xylenes, Total 0.0572 0.0300 10 09/19/2024 05:07 WG2364897
Methyl tert-butyl ether ND 0.0100 10 09/19/2024 05:07 WG2364897
Naphthalene 0.0689 0.0500 10 09/19/2024 05:07 WG2364897
(S) Toluene-d8 113 80.0-120 09/19/2024 05:07 WG2364897
(S) 4-Bromofluorobenzene 106 77.0-126 09/19/2024 05:07 WG2364897
(S) 1,2-Dichloroethane-d4 104 70.0-130 09/19/2024 05:07 WG2364897
Semi-Volatile Organic Compounds (GC) by Method 3511/8015
Result Qualifier RDL Dilution Analysis Batch
Analyte mg/l mg/l date / time
TPH (GC/FID) High Fraction 4.86 0.100 1 09/26/2024 04:22 WG2368759
(S) o-Terphenyl 109 52.0-156 09/26/2024 04:22 WG2368759
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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SAMPLE RESULTS - 03
L1777351
MW-3
Collected date/time: 09/12/24 11:45
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1
Result Qualifier RDL Dilution Analysis Batch
Analyte mg/l mg/l date / time
TPH (GC/MS) Low Fraction ND 0.500 1 09/15/2024 06:14 WG2362702
Benzene ND 0.00100 1 09/15/2024 06:14 WG2362702
Toluene ND 0.00100 1 09/15/2024 06:14 WG2362702
Ethylbenzene ND 0.00100 1 09/15/2024 06:14 WG2362702
Xylenes, Total ND 0.00300 1 09/15/2024 06:14 WG2362702
Methyl tert-butyl ether ND 0.00100 1 09/15/2024 06:14 WG2362702
Naphthalene ND J4 0.00500 1 09/15/2024 06:14 WG2362702
(S) Toluene-d8 101 80.0-120 09/15/2024 06:14 WG2362702
(S) 4-Bromofluorobenzene 108 77.0-126 09/15/2024 06:14 WG2362702
(S) 1,2-Dichloroethane-d4 98.1 70.0-130 09/15/2024 06:14 WG2362702
Semi-Volatile Organic Compounds (GC) by Method 3511/8015
Result Qualifier RDL Dilution Analysis Batch
Analyte mg/l mg/l date / time
TPH (GC/FID) High Fraction 0.822 0.100 1 09/26/2024 04:43 WG2368759
(S) o-Terphenyl 95.5 52.0-156 09/26/2024 04:43 WG2368759
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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SAMPLE RESULTS - 04
L1777351
MW-5R
Collected date/time: 09/12/24 11:05
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1
Result Qualifier RDL Dilution Analysis Batch
Analyte mg/l mg/l date / time
TPH (GC/MS) Low Fraction ND 0.500 1 09/15/2024 06:35 WG2362702
Benzene ND 0.00100 1 09/15/2024 06:35 WG2362702
Toluene ND 0.00100 1 09/15/2024 06:35 WG2362702
Ethylbenzene ND 0.00100 1 09/15/2024 06:35 WG2362702
Xylenes, Total ND 0.00300 1 09/15/2024 06:35 WG2362702
Methyl tert-butyl ether ND 0.00100 1 09/15/2024 06:35 WG2362702
Naphthalene ND J4 0.00500 1 09/15/2024 06:35 WG2362702
(S) Toluene-d8 105 80.0-120 09/15/2024 06:35 WG2362702
(S) 4-Bromofluorobenzene 107 77.0-126 09/15/2024 06:35 WG2362702
(S) 1,2-Dichloroethane-d4 92.9 70.0-130 09/15/2024 06:35 WG2362702
Semi-Volatile Organic Compounds (GC) by Method 3511/8015
Result Qualifier RDL Dilution Analysis Batch
Analyte mg/l mg/l date / time
TPH (GC/FID) High Fraction 0.331 0.100 1 09/26/2024 05:03 WG2368759
(S) o-Terphenyl 90.0 52.0-156 09/26/2024 05:03 WG2368759
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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SAMPLE RESULTS - 05
L1777351
MW-7
Collected date/time: 09/12/24 11:25
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1
Result Qualifier RDL Dilution Analysis Batch
Analyte mg/l mg/l date / time
TPH (GC/MS) Low Fraction 0.766 0.500 1 09/15/2024 06:56 WG2362702
Benzene ND 0.00100 1 09/15/2024 06:56 WG2362702
Toluene ND 0.00100 1 09/15/2024 06:56 WG2362702
Ethylbenzene ND 0.00100 1 09/15/2024 06:56 WG2362702
Xylenes, Total ND 0.00300 1 09/15/2024 06:56 WG2362702
Methyl tert-butyl ether ND 0.00100 1 09/15/2024 06:56 WG2362702
Naphthalene ND J4 0.00500 1 09/15/2024 06:56 WG2362702
(S) Toluene-d8 99.7 80.0-120 09/15/2024 06:56 WG2362702
(S) 4-Bromofluorobenzene 103 77.0-126 09/15/2024 06:56 WG2362702
(S) 1,2-Dichloroethane-d4 89.4 70.0-130 09/15/2024 06:56 WG2362702
Semi-Volatile Organic Compounds (GC) by Method 3511/8015
Result Qualifier RDL Dilution Analysis Batch
Analyte mg/l mg/l date / time
TPH (GC/FID) High Fraction 0.870 0.100 1 09/26/2024 05:24 WG2368759
(S) o-Terphenyl 99.0 52.0-156 09/26/2024 05:24 WG2368759
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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SAMPLE RESULTS - 06
L1777351
MW-8
Collected date/time: 09/12/24 10:25
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1
Result Qualifier RDL Dilution Analysis Batch
Analyte mg/l mg/l date / time
TPH (GC/MS) Low Fraction ND 0.500 1 09/15/2024 07:18 WG2362702
Benzene ND 0.00100 1 09/15/2024 07:18 WG2362702
Toluene ND 0.00100 1 09/15/2024 07:18 WG2362702
Ethylbenzene ND 0.00100 1 09/15/2024 07:18 WG2362702
Xylenes, Total ND 0.00300 1 09/15/2024 07:18 WG2362702
Methyl tert-butyl ether ND 0.00100 1 09/15/2024 07:18 WG2362702
Naphthalene ND J4 0.00500 1 09/15/2024 07:18 WG2362702
(S) Toluene-d8 104 80.0-120 09/15/2024 07:18 WG2362702
(S) 4-Bromofluorobenzene 114 77.0-126 09/15/2024 07:18 WG2362702
(S) 1,2-Dichloroethane-d4 95.6 70.0-130 09/15/2024 07:18 WG2362702
Semi-Volatile Organic Compounds (GC) by Method 3511/8015
Result Qualifier RDL Dilution Analysis Batch
Analyte mg/l mg/l date / time
TPH (GC/FID) High Fraction 0.231 0.100 1 09/26/2024 05:45 WG2368759
(S) o-Terphenyl 84.0 52.0-156 09/26/2024 05:45 WG2368759
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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SAMPLE RESULTS - 07
L1777351
MW-9
Collected date/time: 09/12/24 10:20
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1
Result Qualifier RDL Dilution Analysis Batch
Analyte mg/l mg/l date / time
TPH (GC/MS) Low Fraction ND 0.500 1 09/15/2024 07:39 WG2362702
Benzene ND 0.00100 1 09/15/2024 07:39 WG2362702
Toluene ND 0.00100 1 09/15/2024 07:39 WG2362702
Ethylbenzene ND 0.00100 1 09/15/2024 07:39 WG2362702
Xylenes, Total ND 0.00300 1 09/15/2024 07:39 WG2362702
Methyl tert-butyl ether ND 0.00100 1 09/15/2024 07:39 WG2362702
Naphthalene ND J4 0.00500 1 09/15/2024 07:39 WG2362702
(S) Toluene-d8 104 80.0-120 09/15/2024 07:39 WG2362702
(S) 4-Bromofluorobenzene 112 77.0-126 09/15/2024 07:39 WG2362702
(S) 1,2-Dichloroethane-d4 97.2 70.0-130 09/15/2024 07:39 WG2362702
Semi-Volatile Organic Compounds (GC) by Method 3511/8015
Result Qualifier RDL Dilution Analysis Batch
Analyte mg/l mg/l date / time
TPH (GC/FID) High Fraction 0.432 0.100 1 09/26/2024 06:05 WG2368759
(S) o-Terphenyl 83.5 52.0-156 09/26/2024 06:05 WG2368759
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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SAMPLE RESULTS - 08
L1777351
DUP-01
Collected date/time: 09/12/24 00:00
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1
Result Qualifier RDL Dilution Analysis Batch
Analyte mg/l mg/l date / time
TPH (GC/MS) Low Fraction ND 0.500 1 09/15/2024 08:01 WG2362702
Benzene 0.0460 0.00100 1 09/15/2024 08:01 WG2362702
Toluene 0.00367 0.00100 1 09/15/2024 08:01 WG2362702
Ethylbenzene 0.420 0.0100 10 09/19/2024 05:28 WG2364897
Xylenes, Total 0.0496 0.00300 1 09/15/2024 08:01 WG2362702
Methyl tert-butyl ether ND 0.00100 1 09/15/2024 08:01 WG2362702
Naphthalene 0.0704 0.0500 10 09/19/2024 05:28 WG2364897
(S) Toluene-d8 107 80.0-120 09/15/2024 08:01 WG2362702
(S) Toluene-d8 114 80.0-120 09/19/2024 05:28 WG2364897
(S) 4-Bromofluorobenzene 106 77.0-126 09/15/2024 08:01 WG2362702
(S) 4-Bromofluorobenzene 109 77.0-126 09/19/2024 05:28 WG2364897
(S) 1,2-Dichloroethane-d4 97.4 70.0-130 09/15/2024 08:01 WG2362702
(S) 1,2-Dichloroethane-d4 103 70.0-130 09/19/2024 05:28 WG2364897
Semi-Volatile Organic Compounds (GC) by Method 3511/8015
Result Qualifier RDL Dilution Analysis Batch
Analyte mg/l mg/l date / time
TPH (GC/FID) High Fraction 4.09 0.100 1 09/26/2024 06:26 WG2368759
(S) o-Terphenyl 108 52.0-156 09/26/2024 06:26 WG2368759
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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SAMPLE RESULTS - 09
L1777351
TB-20240912
Collected date/time: 09/12/24 07:00
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1
Result Qualifier RDL Dilution Analysis Batch
Analyte mg/l mg/l date / time
TPH (GC/MS) Low Fraction ND 0.500 1 09/15/2024 04:04 WG2362702
Benzene ND 0.00100 1 09/15/2024 04:04 WG2362702
Toluene ND 0.00100 1 09/15/2024 04:04 WG2362702
Ethylbenzene ND 0.00100 1 09/15/2024 04:04 WG2362702
Xylenes, Total ND 0.00300 1 09/15/2024 04:04 WG2362702
Methyl tert-butyl ether ND 0.00100 1 09/15/2024 04:04 WG2362702
Naphthalene ND J4 0.00500 1 09/15/2024 04:04 WG2362702
(S) Toluene-d8 106 80.0-120 09/15/2024 04:04 WG2362702
(S) 4-Bromofluorobenzene 113 77.0-126 09/15/2024 04:04 WG2362702
(S) 1,2-Dichloroethane-d4 99.1 70.0-130 09/15/2024 04:04 WG2362702
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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QUALITY CONTROL SUMMARYWG2362702
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 L1777351-01,03,04,05,06,07,08,09
Method Blank (MB)
(MB) R4121156-4 09/15/24 03:20
MB Result MB Qualifier MB MDL MB RDL
Analyte mg/l mg/l mg/l
TPH (GC/MS) Low Fraction U 0.108 0.500
Benzene U 0.0000941 0.00100
Toluene U 0.000278 0.00100
Ethylbenzene U 0.000137 0.00100
Xylenes, Total U 0.000174 0.00300
Methyl tert-butyl ether U 0.000101 0.00100
Naphthalene U 0.00100 0.00500
(S) Toluene-d8 105 80.0-120
(S) 4-Bromofluorobenzene 111 77.0-126
(S) 1,2-Dichloroethane-d4 98.4 70.0-130
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R4121156-1 09/15/24 01:54 • (LCSD) R4121156-2 09/15/24 02:15
Spike Amount LCS Result LCSD Result LCS Rec. LCSD Rec. Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte mg/l mg/l mg/l %%%%%
Benzene 0.00500 0.00527 0.00500 105 100 70.0-123 5.26 20
Toluene 0.00500 0.00508 0.00484 102 96.8 79.0-120 4.84 20
Ethylbenzene 0.00500 0.00533 0.00502 107 100 79.0-123 5.99 20
Xylenes, Total 0.0150 0.0162 0.0154 108 103 79.0-123 5.06 20
Methyl tert-butyl ether 0.00500 0.00468 0.00473 93.6 94.6 68.0-125 1.06 20
Naphthalene 0.00500 0.00709 0.00667 142 133 54.0-135 J4 6.10 20
(S) Toluene-d8 103 102 80.0-120
(S) 4-Bromofluorobenzene 110 106 77.0-126
(S) 1,2-Dichloroethane-d4 93.0 97.0 70.0-130
Laboratory Control Sample (LCS)
(LCS) R4121156-3 09/15/24 02:37
Spike Amount LCS Result LCS Rec. Rec. Limits LCS Qualifier
Analyte mg/l mg/l %%
TPH (GC/MS) Low Fraction 5.00 5.02 100 66.0-132
(S) Toluene-d8 106 80.0-120
(S) 4-Bromofluorobenzene 115 77.0-126
(S) 1,2-Dichloroethane-d4 90.3 70.0-130
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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QUALITY CONTROL SUMMARYWG2364897
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 L1777351-02,08
Method Blank (MB)
(MB) R4121720-4 09/18/24 21:48
MB Result MB Qualifier MB MDL MB RDL
Analyte mg/l mg/l mg/l
TPH (GC/MS) Low Fraction U 0.108 0.500
Benzene U 0.0000941 0.00100
Toluene U 0.000278 0.00100
Ethylbenzene U 0.000137 0.00100
Xylenes, Total U 0.000174 0.00300
Methyl tert-butyl ether U 0.000101 0.00100
Naphthalene U 0.00100 0.00500
(S) Toluene-d8 113 80.0-120
(S) 4-Bromofluorobenzene 106 77.0-126
(S) 1,2-Dichloroethane-d4 107 70.0-130
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R4121720-1 09/18/24 20:02 • (LCSD) R4121720-2 09/18/24 20:23
Spike Amount LCS Result LCSD Result LCS Rec. LCSD Rec. Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte mg/l mg/l mg/l %%%%%
Benzene 0.00500 0.00515 0.00485 103 97.0 70.0-123 6.00 20
Toluene 0.00500 0.00572 0.00530 114 106 79.0-120 7.62 20
Ethylbenzene 0.00500 0.00589 0.00555 118 111 79.0-123 5.94 20
Xylenes, Total 0.0150 0.0176 0.0163 117 109 79.0-123 7.67 20
Methyl tert-butyl ether 0.00500 0.00483 0.00481 96.6 96.2 68.0-125 0.415 20
Naphthalene 0.00500 0.00370 0.00391 74.0 78.2 54.0-135 5.52 20
(S) Toluene-d8 111 111 80.0-120
(S) 4-Bromofluorobenzene 107 108 77.0-126
(S) 1,2-Dichloroethane-d4 106 104 70.0-130
Laboratory Control Sample (LCS)
(LCS) R4121720-3 09/18/24 21:05
Spike Amount LCS Result LCS Rec. Rec. Limits LCS Qualifier
Analyte mg/l mg/l %%
TPH (GC/MS) Low Fraction 5.00 5.76 115 66.0-132
(S) Toluene-d8 110 80.0-120
(S) 4-Bromofluorobenzene 113 77.0-126
(S) 1,2-Dichloroethane-d4 107 70.0-130
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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QUALITY CONTROL SUMMARYWG2368759
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 L1777351-01,02,03,04,05,06,07,08
Method Blank (MB)
(MB) R4125084-1 09/25/24 22:51
MB Result MB Qualifier MB MDL MB RDL
Analyte mg/l mg/l mg/l
TPH (GC/FID) High Fraction U 0.0247 0.100
(S) o-Terphenyl 83.0 52.0-156
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R4125084-2 09/25/24 23:11 • (LCSD) R4125084-3 09/25/24 23:32
Spike Amount LCS Result LCSD Result LCS Rec. LCSD Rec. Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte mg/l mg/l mg/l %%%%%
TPH (GC/FID) High Fraction 1.50 1.54 1.62 103 108 50.0-150 5.06 20
(S) o-Terphenyl 87.0 91.0 52.0-156
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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GLOSSARY OF TERMS
Guide to Reading and Understanding Your Laboratory Report
The information below is designed to better explain the various terms used in your report of analytical results from the Laboratory. This is not
intended as a comprehensive explanation, and if you have additional questions please contact your project representative.
Results Disclaimer - Information that may be provided by the customer, and contained within this report, include Permit Limits, Project Name,
Sample ID, Sample Matrix, Sample Preservation, Field Blanks, Field Spikes, Field Duplicates, On-Site Data, Sampling Collection Dates/Times, and
Sampling Location. Results relate to the accuracy of this information provided, and as the samples are received.
Abbreviations and Definitions
MDL Method Detection Limit.
ND Not detected at the Reporting Limit (or MDL where applicable).
RDL Reported Detection Limit.
Rec.Recovery.
RPD Relative Percent Difference.
SDG Sample Delivery Group.
(S)
Surrogate (Surrogate Standard) - Analytes added to every blank, sample, Laboratory Control Sample/Duplicate and
Matrix Spike/Duplicate; used to evaluate analytical efficiency by measuring recovery. Surrogates are not expected to be
detected in all environmental media.
U Not detected at the Reporting Limit (or MDL where applicable).
Analyte The name of the particular compound or analysis performed. Some Analyses and Methods will have multiple analytes
reported.
Dilution
If the sample matrix contains an interfering material, the sample preparation volume or weight values differ from the
standard, or if concentrations of analytes in the sample are higher than the highest limit of concentration that the
laboratory can accurately report, the sample may be diluted for analysis. If a value different than 1 is used in this field, the
result reported has already been corrected for this factor.
Limits
These are the target % recovery ranges or % difference value that the laboratory has historically determined as normal
for the method and analyte being reported. Successful QC Sample analysis will target all analytes recovered or
duplicated within these ranges.
Qualifier
This column provides a letter and/or number designation that corresponds to additional information concerning the result
reported. If a Qualifier is present, a definition per Qualifier is provided within the Glossary and Definitions page and
potentially a discussion of possible implications of the Qualifier in the Case Narrative if applicable.
Result
The actual analytical final result (corrected for any sample specific characteristics) reported for your sample. If there was
no measurable result returned for a specific analyte, the result in this column may state “ND” (Not Detected) or “BDL”
(Below Detectable Levels). The information in the results column should always be accompanied by either an MDL
(Method Detection Limit) or RDL (Reporting Detection Limit) that defines the lowest value that the laboratory could detect
or report for this analyte.
Uncertainty
(Radiochemistry)Confidence level of 2 sigma.
Case Narrative (Cn)
A brief discussion about the included sample results, including a discussion of any non-conformances to protocol
observed either at sample receipt by the laboratory from the field or during the analytical process. If present, there will
be a section in the Case Narrative to discuss the meaning of any data qualifiers used in the report.
Quality Control
Summary (Qc)
This section of the report includes the results of the laboratory quality control analyses required by procedure or
analytical methods to assist in evaluating the validity of the results reported for your samples. These analyses are not
being performed on your samples typically, but on laboratory generated material.
Sample Chain of
Custody (Sc)
This is the document created in the field when your samples were initially collected. This is used to verify the time and
date of collection, the person collecting the samples, and the analyses that the laboratory is requested to perform. This
chain of custody also documents all persons (excluding commercial shippers) that have had control or possession of the
samples from the time of collection until delivery to the laboratory for analysis.
Sample Results (Sr)
This section of your report will provide the results of all testing performed on your samples. These results are provided
by sample ID and are separated by the analyses performed on each sample. The header line of each analysis section for
each sample will provide the name and method number for the analysis reported.
Sample Summary (Ss)This section of the Analytical Report defines the specific analyses performed for each sample ID, including the dates and
times of preparation and/or analysis.
Qualifier Description
J4 The associated batch QC was outside the established quality control range for accuracy.
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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Pace Analytical National 12065 Lebanon Rd Mount Juliet, TN 37122
Alabama 40660 Nebraska NE-OS-15-05
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Idaho TN00003 Ohio–VAP CL0069
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Kentucky ¹ ⁶KY90010 South Carolina 84004002
Kentucky ²16 South Dakota n/a
Louisiana AI30792 Tennessee ¹ ⁴2006
Louisiana LA018 Texas T104704245-20-18
Maine TN00003 Texas ⁵LAB0152
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A2LA – ISO 17025 ⁵1461.02 DOD 1461.01
Canada 1461.01 USDA P330-15-00234
EPA–Crypto TN00003
ACCREDITATIONS & LOCATIONS
¹ Drinking Water ² Underground Storage Tanks ³ Aquatic Toxicity ⁴ Chemical/Microbiological ⁵ Mold ⁶ Wastewater n/a Accreditation not applicable
* Not all certifications held by the laboratory are applicable to the results reported in the attached report.
* Accreditation is only applicable to the test methods specified on each scope of accreditation held by Pace Analytical.
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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ATTACHMENT 2
Aerial Photographs
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