HomeMy WebLinkAboutDERR-2024-009276Stantec Consulting Services Inc.
2890 East Cottonwood Parkway Suite 300, Salt Lake City UT 84121-7283
July 23, 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 second 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 well abandonment and replacement activities and evaluate the effect of the March 2021 remedial
excavation.
BACKGROUND
7-Eleven has leased the southern portion of the property since 1986 and has 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
former UST basin (west of the current automotive service facility building). The sample contained
July 23, 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
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.
Based on the soil and groundwater analytical results of the LSI by Wasatch, a petroleum release from the
7-Eleven UST system was reported to the UDEQ-DERR on May 11, 2020. Soil and groundwater analytical
results presented in the Wasatch report indicated concentrations of petroleum hydrocarbon constituents at
the Site exceeding the ISLs and Tier 1 Screening Levels (TSLs) developed by the UDEQ-DERR LUST
Section. The groundwater samples collected by Wasatch were grab-type samples as only enough
groundwater was purged to improve the sample turbidity; three well volumes were not purged before
collection. Based on these results, the UDEQ-DERR assigned Release Site NXK to the Site and requested
a subsurface investigation
Under WP&B NXK-01, Stantec conducted the subsurface investigation on October 26 and 27, 2020 (with
groundwater sampling conducted on November 12, 2020). Benzene was reported exceeding the ISL in a
soil sample collected from the on-site boring advanced to install monitoring well MW-2. TPH-GRO was
reported exceeding the ISL in a soil sample collected from the off-site 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.
July 23, 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.
GROUNDWATER MONITORING METHODS
On June 26, 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 June
26 and 27, 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-20240627)
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
volatile organic compounds (VOCs) by EPA Method 8260B. All analyses were performed by Pace
July 23, 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
Analytical National (Pace) located in Mount Juliet, Tennessee. Laboratory report and chain-of-custody
documentation are included as Attachment 1.
GROUNDWATER MONITORING RESULTS
On June 26, 2024, shallow groundwater beneath the Site was measured at depths ranging from 10.22
(MW-2R) to 12.36 (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
second 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 0.067 feet per foot (as estimated between wells MW-1 and MW-7).
Groundwater elevations across the site increased between the December 2023 and June 2024
monitoring events; the June 2024 groundwater elevations are the highest observed at the Site.
The dissolved benzene, ethylbenzene, TPH-DRO and TPH-GRO concentrations in MW-1 exceeded
the respective ISLs.
The dissolved benzene concentration in MW-2R decreased below the TSL but remains above the ISL.
The dissolved TPH-GRO concentration exceeded the TSL, but the duplicate TPH-GRO concentration
only exceeded the ISL. The dissolved TPH-DRO concentration exceeded the ISL.
The dissolved TPH-DRO concentrations in MW-3, MW-7, and MW-8 all decreased below the ISL.
The ethylbenzene and total xylenes concentrations presented in Table 1 for the June 2024 DUP-01
sample are a repeat analysis with dilution. The original analysis occurred within holding time, but the
repeat analysis with dilution did not.
Relative percent differences calculated between the MW-2R and DUP-01 sample analytical results
were within generally accepted standards with the exception of the TPH-GRO and TPH-DRO results.
No petroleum hydrocarbons were detected at concentrations above RDLs in the trip blank.
All other petroleum hydrocarbon concentrations were either below ISLs or were not detected above
RDLs.
All other RDLs were below the respective ISLs.
CONCLUSIONS AND RECOMMENDATIONS
Site wide dissolved petroleum hydrocarbon concentration trends do not appear well established since
replacement wells were installed and quarterly groundwater monitoring resumed in 2023. Dissolved
petroleum hydrocarbon concentrations versus time for select wells are shown in the attached Graphs.
Results where the RDL exceeded a UDEQ-DERR screening level are not graphed.
As stated in previous Quarterly Groundwater Monitoring Reports, replacement well MW-2R appears to
provide data that is comparable to the original MW-2 well. Replacement wells MW-5R, MW-8, and MW-9
do not appear to provide data that is directly comparable to the original MW-5, MW-4, and MW-6 wells,
respectively.
July 23, 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
TPH-DRO concentration trends remain variable across the Site. Between the December 2023 and June
2024 monitoring events, TPH-DRO concentrations in upgradient wells MW-1, MW-2R, and MW-5R
increased significantly; concentrations decreased significantly in these wells between the September and
December 2023 monitoring events. Similarly in downgradient wells MW-3, MW-7, and MW-8 TPH-DRO
concentrations decreased significantly in June 2024, and these wells saw TPH-DRO increases in
December 2023. The June 2024 MW-8 TPH-DRO concentration suggests that the three order-of-
magnitude increase in the MW-8 TPH-DRO concentration between September and December 2023 may
have been erroneous data possibly due to cross contamination in the field (as suggested by the TPH-DRO
detection in the field blank sample during the December 2023 monitoring event). Site TPH-DRO impacts
may be attributed to an off-site source as diesel was not historically sold at 7-Eleven Store No. 27074.
Evaluating dissolved petroleum concentrations in conjunction with groundwater elevation fluctuations also
suggests the possibility that current TPH-DRO conditions are not associated with Release Site NXK. TPH-
DRO (and in some cases TPH-GRO) fluctuate differently than MBTEXN compounds within the same well.
For example, in upgradient well MW-2R the recent TPH-DRO (and TPH-GRO) concentration appears to
increase with increased groundwater elevation, whereas recent benzene and ethylbenzene concentrations
behave the opposite way. This may suggest different release conditions between MBTEXN and TPH-DRO
compounds. This observation is reversed for downgradient wells.
As discussed via electronic communication on March 27 and 28, 2024, Stantec will complete a desktop
study to evaluate the potential for an off-site petroleum source contributing to the current dissolved
concentration trends as a precursor to a potential passive soil gas (PSG) investigation. The results of this
desktop study will be presented in the groundwater monitoring report for the third quarter of 2024. As
previously stated, the consistent southwest groundwater gradient at the Site does not support the idea that
Release Site IPT (associated with the adjacent Minit Lube property to the north) is contributing to the
increasing dissolved petroleum concentrations, as the USTs related to Release Site IPT were located in
the northwest portion of the Minit Lube property.
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
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
July 23, 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
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
Figure 2 Groundwater Elevation Contour Map
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 Dissolved Concentrations vs. Time Graphs
Graph 2 MW-2/2R Select Dissolved Concentrations vs. Time Graphs
Graph 3 MW-3 Select Dissolved Concentrations vs. Time Graphs
Graph 4 MW-5/5R Select Dissolved Concentrations vs. Time Graphs
Graph 5 MW-7 Select Dissolved Concentrations vs. Time Graphs
Graph 6 MW-8 Dissolved TPH-DRO Concentrations vs. Time Graphs
Graph 7 MW-9 Dissolved TPH-DRO Concentrations vs. Time Graphs
Attachment 1 Laboratory Report and Chain-of-Custody Documentation
c. File / 7-Eleven Inc.
John Wainwright, Stantec
FIGURES
MW-1
MW-3
MW-7
3200 SOUTH
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FORMERCANOPY/DISPENSERS
CONVENIENCE
STORE
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AUTOMOTIVE
SERVICE
FACILITY
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ELEVEN
FORMERPLANTERPLANTER
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UTILITY POLE
STREET LIGHT
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STORE NO. 27074
FORMER
UST BASIN
FORMERSIGN
FORMERPLANTER
FORMERPLANTER
FORMERPLANTER
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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
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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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FORMERCANOPY/DISPENSERS
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BUILDING
AUTOMOTIVE
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FACILITY
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MW-6
MW-2
MW-5
MW-4
MW-2R
87.35
MW-9
87.57
MW-8
84.99
MW-5R
88.75
MW-7
83.24
MW-1
87.19
MW-3
85.17
203721870 STA AMS JPW 07/18/24
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\2Q 2024\_FIG 2_7-11_27074_GWE CONTOUR MAP.dwg | Layout Tab: 2 | Drafter: SAguinaldo | Jul 18, 2024 at 21:07
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
JUNE 26, 2024
87.19 GROUNDWATER SURFACE ELEVATION
(FEET ABOVE MEAN SEA LEVEL)
GROUNDWATER ELEVATION CONTOUR
(DASHED WHERE INFERRED)84
8
4
85
8
6
8
7
8
8
88
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7
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6
8
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8
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3200 SOUTH
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FACILITY
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MW-6
MW-2
MW-5
MW-4
MW-2R0.0219
MW-9
<0.00100
MW-8
<0.00100
MW-5R
<0.00100
MW-7
<0.00100
MW-1
0.117MW-3
0.00221
203721870 STA AMS JPW 07/18/24
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\2Q 2024\FIG 3_7-11_27074_BENZENE MAP.dwg | Layout Tab: 3 | Drafter: SAguinaldo | Jul 18, 2024 at 21:09
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
JUNE 26, 2024
0.177 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
3200 SOUTH
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MW-6
MW-2
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MW-4
MW-2R
25.1
MW-9
<0.500
MW-8
<0.500
MW-5R
<0.500
MW-7
0.896
MW-1
5.52MW-30.616
203721870 STA AMS JPW 07/18/24
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\2Q 2024\FIG 4_7-11_27074_GRO ISOCON MAP.dwg | Layout Tab: 4 | Drafter: SAguinaldo | Jul 18, 2024 at 21:10
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
JUNE 26, 2024
5.52 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
10
1
3200 SOUTH
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MW-6
MW-2
MW-5
MW-2R
1.44
MW-90.413
MW-80.125
MW-5R
0.467
MW-7
0.872
MW-1
9.40
MW-30.786
MW-4
203721870 STA AMS JPW 07/18/24
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\2Q 2024\FIG 5_7-11_27074_DRO ISOCON MAP.dwg | Layout Tab: 5 | Drafter: SAguinaldo | Jul 18, 2024 at 21:02
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
JUNE 26, 2024
9.40 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
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
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
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
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
MW-1
MW-2#
MW-3
MBTEXN Compounds
(mg/L)
MW-4#
MW-5#
MW-6#
Naphthalene
TPH-GRO
(mg/L)
UDEQ DERR Initial Screening Level
MW-5R
MW-2R
TolueneBenzene
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
UDEQ DERR Tier 1 Screening Level
dbs_27074_20240626-27_ams.xlsx Water 1 of 3 Stantec Consulting Services Inc.
MTBE
MBTEXN Compounds
(mg/L)
Naphthalene
TPH-GRO
(mg/L)TolueneBenzene
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
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
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
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
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 (%)-------- 189 --96 47 ----157
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 (%)-- -- ---- 167 6 77 100 62.14 67 26
DUP-01 (MW-2R)12/15/23 -- --<0.001000 0.338 Q,J2 0.0190 J2 1.36 Q,J2 3.00 Q,J2 0.405 10.8 2.97 ~
RPD (%)-- -- ---- 176 90 98 134 102 80 --
DUP-01 (MW-2R)06/27/24 -- --<0.001000 0.0328 0.00231 0.512
Q 0.662 Q 0.185 J3 4.02 B 2.75
RPD (%)-- -- ---- 40 -- 10 11 33 145 63
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 10UDEQ DERR Tier 1 Screening Level
MW-7
UDEQ DERR Initial Screening Level
MW-9
MW-8
20
20
20
20
20
20
20
Q,Z1,J
2
MW-9
MW-8
MW-7
MW-5R
MW-3
MW-2R
MW-1
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
Well ID Elevation*
Screened
Interval
(feet)
Total Well
Depth
(feet)
5 to 20
5 to 20
97.57
97.67
Relative Top
(feet)
of Casing
dbs_27074_20240626-27_ams.xlsx 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.
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.
dbs_27074_20240626-27_ams.xlsx Water 3 of 3 Stantec Consulting Services Inc.
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
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 1A
7-Eleven Store No. 27074
MW-1 Benzene Concentration vs. Time
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
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 1B
7-Eleven Store No. 27074
MW-1 Ethylebenzene Concentration vs. Time
ISL TSL Ethylbenzene 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
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 1C
7-Eleven Store No. 27074
MW-1 TPH-GRO Concentration vs. Time
ISL TSL TPH-GRO 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
Fe
b
-
2
3
Ma
y
-
2
3
Au
g
-
2
3
No
v
-
2
3
Fe
b
-
2
4
Ma
y
-
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
GRAPH 1
MW-1 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
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 2A
7-Eleven Store No. 27074
MW-2/2R Benzene Concentration vs. Time
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
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 2B
7-Eleven Store No. 27074
MW-2/2R Ethylebenzene Concentration vs. Time
ISL TSL Ethylbenzene 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
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 2C
7-Eleven Store No. 27074
MW-2/2R TPH-GRO Concentration vs. Time
ISL TSL TPH-GRO Depth to Groundwater
*Closed markers indicate MW-2R data.
DUP-01 data used to plot 03/10/23 result.
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
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.
GRAPH 2
MW-2/2R 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
n
-
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 3A
7-Eleven Store No. 27074
MW-3 Benzene Concentration vs. Time
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
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 3B
7-Eleven Store No. 27074
MW-3 TPH-GRO Concentration vs. Time
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
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 3C
7-Eleven Store No. 27074
MW-3 TPH-DRO Concentration vs. Time
ISL TSL TPH-DRO Depth to Groundwater
GRAPH 3
MW-3 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
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 4A
7-Eleven Store No. 27074
MW-5/5R TPH-GRO Concentration vs. Time
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
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 4A
7-Eleven Store No. 27074
MW-5/5R TPH-DRO Concentration vs. Time
ISL TSL TPH-DRO Depth to Groundwater
*Closed markers indicate MW-5R data.
GRAPH 4
MW-5/5R 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
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 5A
7-Eleven Store No. 27074
MW-7 TPH-GRO Concentration vs. Time
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
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 5B
7-Eleven Store No. 27074
MW-7 TPH-DRO Concentration vs. Time
ISL TSL TPH-DRO Depth to Groundwater
GRAPH 5
MW-7 Select Concentration vs. Time Graphs
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
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
Ma
r
-
2
3
Ju
n
-
2
3
Se
p
-
2
3
De
c
-
2
3
Ma
r
-
2
4
Ju
n
-
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
ATTACHMENT 1
Laboratory Report and Chain-of-Custody Documentation
ANALYTICAL REPORT
July 12, 2024
711 Stantec - Salt Lake City, UT
Sample Delivery Group:L1752277
Samples Received:06/29/2024
Project Number:203721870
Description:7-11 #27074 Ogden, UT
Report To:Anna Skinner
2890 E Cottonwood Pkwy
Suite 300
Salt Lake City, UT 84121
Entire Report Reviewed By:
July 12, 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 L1752277 07/12/24 17:07 1 of 21
July 12, 2024
Marty Edwards III
Project Manager
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
711 Stantec - Salt Lake City, UT 203721870 L1752277 07/12/24 17:21 1 of 21
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 L1752277-01 6
MW-2R L1752277-02 7
MW-3 L1752277-03 8
MW-5R L1752277-04 9
MW-7 L1752277-05 10
MW-8 L1752277-06 11
MW-9 L1752277-07 12
DUPLICATE L1752277-08 13
TRIP BLANK L1752277-09 14
Qc: Quality Control Summary 15
Volatile Organic Compounds (GC/MS) by Method 8260B 15
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 16
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 17
Gl: Glossary of Terms 19
Al: Accreditations & Locations 20
Sc: Sample Chain of Custody 21
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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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
711 Stantec - Salt Lake City, UT 203721870 L1752277 07/12/24 17:21 2 of 21
SAMPLE SUMMARY
Collected by Collected date/time Received date/time
MW-1 L1752277-01 GW Andrew Huffman 06/27/24 11:15 06/29/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2318601 10 07/07/24 14:19 07/07/24 14:19 DYW Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2319322 1 07/09/24 15:05 07/10/24 23:33 DMG Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-2R L1752277-02 GW Andrew Huffman 06/27/24 12:15 06/29/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2318601 50 07/07/24 14:40 07/07/24 14:40 DYW Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2319322 1 07/09/24 15:05 07/10/24 23:54 DMG Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-3 L1752277-03 GW Andrew Huffman 06/26/24 13:27 06/29/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2318601 1 07/07/24 10:45 07/07/24 10:45 DYW Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2318574 1 07/09/24 08:19 07/11/24 07:17 KAP Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-5R L1752277-04 GW Andrew Huffman 06/26/24 14:15 06/29/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2318601 1 07/07/24 11:06 07/07/24 11:06 DYW Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2318574 1 07/09/24 08:19 07/11/24 07:37 KAP Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-7 L1752277-05 GW Andrew Huffman 06/26/24 12:40 06/29/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2318601 1 07/07/24 11:28 07/07/24 11:28 DYW Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2318574 1 07/09/24 08:19 07/11/24 07:57 KAP Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-8 L1752277-06 GW Andrew Huffman 06/26/24 16:17 06/29/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2318601 1 07/07/24 11:49 07/07/24 11:49 DYW Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2318574 1 07/09/24 08:19 07/11/24 08:17 KAP Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-9 L1752277-07 GW Andrew Huffman 06/26/24 15:30 06/29/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2318601 1 07/07/24 12:10 07/07/24 12:10 DYW Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2318574 1 07/09/24 08:19 07/11/24 08:37 KAP 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 L1752277 07/12/24 17:07 3 of 21
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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SAMPLE SUMMARY
Collected by Collected date/time Received date/time
DUPLICATE L1752277-08 GW Andrew Huffman 06/27/24 12:25 06/29/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B WG2321259 20 07/12/24 00:50 07/12/24 00:50 JHH Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2318601 1 07/07/24 12:32 07/07/24 12:32 DYW Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2319322 1 07/09/24 15:05 07/11/24 00:14 DMG Mt. Juliet, TN
Collected by Collected date/time Received date/time
TRIP BLANK L1752277-09 GW Andrew Huffman 06/27/24 00:00 06/29/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2318601 1 07/07/24 09:41 07/07/24 09:41 DYW 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 L1752277 07/12/24 17:07 4 of 21
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
711 Stantec - Salt Lake City, UT 203721870 L1752277 07/12/24 17:21 4 of 21
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
Sample Delivery Group (SDG) Narrative
pH outside of method requirement.
Lab Sample ID Project Sample ID Method
L1752277-01 MW-1 3511/8015
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 L1752277 07/12/24 17:07 5 of 21
Marty Edwards III
Project Manager
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
711 Stantec - Salt Lake City, UT 203721870 L1752277 07/12/24 17:21 5 of 21
SAMPLE RESULTS - 01
L1752277
MW-1
Collected date/time: 06/27/24 11:15
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 5.52 B 5.00 10 07/07/2024 14:19 WG2318601
Benzene 0.117 0.0100 10 07/07/2024 14:19 WG2318601
Toluene ND 0.0100 10 07/07/2024 14:19 WG2318601
Ethylbenzene 0.932 0.0100 10 07/07/2024 14:19 WG2318601
Xylenes, Total ND 0.0300 10 07/07/2024 14:19 WG2318601
Methyl tert-butyl ether ND 0.0100 10 07/07/2024 14:19 WG2318601
Naphthalene 0.0590 J3 0.0500 10 07/07/2024 14:19 WG2318601
(S) Toluene-d8 107 80.0-120 07/07/2024 14:19 WG2318601
(S) 4-Bromofluorobenzene 98.1 77.0-126 07/07/2024 14:19 WG2318601
(S) 1,2-Dichloroethane-d4 98.1 70.0-130 07/07/2024 14:19 WG2318601
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 9.40 0.100 1 07/10/2024 23:33 WG2319322
(S) o-Terphenyl 109 52.0-156 07/10/2024 23:33 WG2319322
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
L1752277
MW-2R
Collected date/time: 06/27/24 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 25.1 B 25.0 50 07/07/2024 14:40 WG2318601
Benzene 0.0219 Z1 0.00471 50 07/07/2024 14:40 WG2318601
Toluene ND 0.0500 50 07/07/2024 14:40 WG2318601
Ethylbenzene 0.465 0.0500 50 07/07/2024 14:40 WG2318601
Xylenes, Total 0.591 0.150 50 07/07/2024 14:40 WG2318601
Methyl tert-butyl ether ND 0.00505 50 07/07/2024 14:40 WG2318601
Naphthalene 0.132 J3 Z1 0.0500 50 07/07/2024 14:40 WG2318601
(S) Toluene-d8 111 80.0-120 07/07/2024 14:40 WG2318601
(S) 4-Bromofluorobenzene 101 77.0-126 07/07/2024 14:40 WG2318601
(S) 1,2-Dichloroethane-d4 97.7 70.0-130 07/07/2024 14:40 WG2318601
Sample Narrative:
L1752277-02 WG2318601: Benzene, MTBE, Naphthalene were reported to the MDL.
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 1.44 0.100 1 07/10/2024 23:54 WG2319322
(S) o-Terphenyl 76.8 52.0-156 07/10/2024 23:54 WG2319322
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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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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SAMPLE RESULTS - 03
L1752277
MW-3
Collected date/time: 06/26/24 13:27
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 0.616 B 0.500 1 07/07/2024 10:45 WG2318601
Benzene 0.00221 0.00100 1 07/07/2024 10:45 WG2318601
Toluene ND 0.00100 1 07/07/2024 10:45 WG2318601
Ethylbenzene 0.0140 0.00100 1 07/07/2024 10:45 WG2318601
Xylenes, Total ND 0.00300 1 07/07/2024 10:45 WG2318601
Methyl tert-butyl ether ND 0.00100 1 07/07/2024 10:45 WG2318601
Naphthalene ND J3 0.00500 1 07/07/2024 10:45 WG2318601
(S) Toluene-d8 111 80.0-120 07/07/2024 10:45 WG2318601
(S) 4-Bromofluorobenzene 99.3 77.0-126 07/07/2024 10:45 WG2318601
(S) 1,2-Dichloroethane-d4 96.4 70.0-130 07/07/2024 10:45 WG2318601
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 0.786 0.100 1 07/11/2024 07:17 WG2318574
(S) o-Terphenyl 78.9 52.0-156 07/11/2024 07:17 WG2318574
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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SAMPLE RESULTS - 04
L1752277
MW-5R
Collected date/time: 06/26/24 14:15
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 0.500 1 07/07/2024 11:06 WG2318601
Benzene ND 0.00100 1 07/07/2024 11:06 WG2318601
Toluene ND 0.00100 1 07/07/2024 11:06 WG2318601
Ethylbenzene ND 0.00100 1 07/07/2024 11:06 WG2318601
Xylenes, Total ND 0.00300 1 07/07/2024 11:06 WG2318601
Methyl tert-butyl ether ND 0.00100 1 07/07/2024 11:06 WG2318601
Naphthalene ND J3 0.00500 1 07/07/2024 11:06 WG2318601
(S) Toluene-d8 109 80.0-120 07/07/2024 11:06 WG2318601
(S) 4-Bromofluorobenzene 102 77.0-126 07/07/2024 11:06 WG2318601
(S) 1,2-Dichloroethane-d4 98.3 70.0-130 07/07/2024 11:06 WG2318601
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 0.467 0.100 1 07/11/2024 07:37 WG2318574
(S) o-Terphenyl 73.2 52.0-156 07/11/2024 07:37 WG2318574
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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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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SAMPLE RESULTS - 05
L1752277
MW-7
Collected date/time: 06/26/24 12:40
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 0.896 B 0.500 1 07/07/2024 11:28 WG2318601
Benzene ND 0.00100 1 07/07/2024 11:28 WG2318601
Toluene ND 0.00100 1 07/07/2024 11:28 WG2318601
Ethylbenzene ND 0.00100 1 07/07/2024 11:28 WG2318601
Xylenes, Total ND 0.00300 1 07/07/2024 11:28 WG2318601
Methyl tert-butyl ether ND 0.00100 1 07/07/2024 11:28 WG2318601
Naphthalene ND J3 0.00500 1 07/07/2024 11:28 WG2318601
(S) Toluene-d8 109 80.0-120 07/07/2024 11:28 WG2318601
(S) 4-Bromofluorobenzene 96.2 77.0-126 07/07/2024 11:28 WG2318601
(S) 1,2-Dichloroethane-d4 98.3 70.0-130 07/07/2024 11:28 WG2318601
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 0.872 0.100 1 07/11/2024 07:57 WG2318574
(S) o-Terphenyl 80.0 52.0-156 07/11/2024 07:57 WG2318574
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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SAMPLE RESULTS - 06
L1752277
MW-8
Collected date/time: 06/26/24 16:17
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 07/07/2024 11:49 WG2318601
Benzene ND 0.00100 1 07/07/2024 11:49 WG2318601
Toluene ND 0.00100 1 07/07/2024 11:49 WG2318601
Ethylbenzene ND 0.00100 1 07/07/2024 11:49 WG2318601
Xylenes, Total ND 0.00300 1 07/07/2024 11:49 WG2318601
Methyl tert-butyl ether ND 0.00100 1 07/07/2024 11:49 WG2318601
Naphthalene ND J3 0.00500 1 07/07/2024 11:49 WG2318601
(S) Toluene-d8 115 80.0-120 07/07/2024 11:49 WG2318601
(S) 4-Bromofluorobenzene 103 77.0-126 07/07/2024 11:49 WG2318601
(S) 1,2-Dichloroethane-d4 102 70.0-130 07/07/2024 11:49 WG2318601
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 0.125 0.100 1 07/11/2024 08:17 WG2318574
(S) o-Terphenyl 66.8 52.0-156 07/11/2024 08:17 WG2318574
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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SAMPLE RESULTS - 07
L1752277
MW-9
Collected date/time: 06/26/24 15:30
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 07/07/2024 12:10 WG2318601
Benzene ND 0.00100 1 07/07/2024 12:10 WG2318601
Toluene ND 0.00100 1 07/07/2024 12:10 WG2318601
Ethylbenzene ND 0.00100 1 07/07/2024 12:10 WG2318601
Xylenes, Total ND 0.00300 1 07/07/2024 12:10 WG2318601
Methyl tert-butyl ether ND 0.00100 1 07/07/2024 12:10 WG2318601
Naphthalene ND J3 0.00500 1 07/07/2024 12:10 WG2318601
(S) Toluene-d8 114 80.0-120 07/07/2024 12:10 WG2318601
(S) 4-Bromofluorobenzene 101 77.0-126 07/07/2024 12:10 WG2318601
(S) 1,2-Dichloroethane-d4 98.5 70.0-130 07/07/2024 12:10 WG2318601
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 0.413 0.100 1 07/11/2024 08:37 WG2318574
(S) o-Terphenyl 73.7 52.0-156 07/11/2024 08:37 WG2318574
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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SAMPLE RESULTS - 08
L1752277
DUPLICATE
Collected date/time: 06/27/24 12:25
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 4.02 B 0.500 1 07/07/2024 12:32 WG2318601
Benzene 0.0328 0.00100 1 07/07/2024 12:32 WG2318601
Toluene 0.00231 0.00100 1 07/07/2024 12:32 WG2318601
Ethylbenzene 0.512 Q 0.0200 20 07/12/2024 00:50 WG2321259
Xylenes, Total 0.662 Q 0.0600 20 07/12/2024 00:50 WG2321259
Methyl tert-butyl ether ND 0.00100 1 07/07/2024 12:32 WG2318601
Naphthalene 0.185 J3 0.00500 1 07/07/2024 12:32 WG2318601
(S) Toluene-d8 86.1 80.0-120 07/07/2024 12:32 WG2318601
(S) Toluene-d8 110 80.0-120 07/12/2024 00:50 WG2321259
(S) 4-Bromofluorobenzene 82.4 77.0-126 07/07/2024 12:32 WG2318601
(S) 4-Bromofluorobenzene 102 77.0-126 07/12/2024 00:50 WG2321259
(S) 1,2-Dichloroethane-d4 106 70.0-130 07/07/2024 12:32 WG2318601
(S) 1,2-Dichloroethane-d4 99.2 70.0-130 07/12/2024 00:50 WG2321259
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 2.75 0.100 1 07/11/2024 00:14 WG2319322
(S) o-Terphenyl 77.9 52.0-156 07/11/2024 00:14 WG2319322
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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SAMPLE RESULTS - 09
L1752277
TRIP BLANK
Collected date/time: 06/27/24 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 07/07/2024 09:41 WG2318601
Benzene ND 0.00100 1 07/07/2024 09:41 WG2318601
Toluene ND 0.00100 1 07/07/2024 09:41 WG2318601
Ethylbenzene ND 0.00100 1 07/07/2024 09:41 WG2318601
Xylenes, Total ND 0.00300 1 07/07/2024 09:41 WG2318601
Methyl tert-butyl ether ND 0.00100 1 07/07/2024 09:41 WG2318601
Naphthalene ND J3 0.00500 1 07/07/2024 09:41 WG2318601
(S) Toluene-d8 116 80.0-120 07/07/2024 09:41 WG2318601
(S) 4-Bromofluorobenzene 102 77.0-126 07/07/2024 09:41 WG2318601
(S) 1,2-Dichloroethane-d4 98.1 70.0-130 07/07/2024 09:41 WG2318601
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 SUMMARYWG2321259
Volatile Organic Compounds (GC/MS) by Method 8260B L1752277-08
Method Blank (MB)
(MB) R4093176-4 07/11/24 20:00
MB Result MB Qualifier MB MDL MB RDL
Analyte mg/l mg/l mg/l
Ethylbenzene U 0.000137 0.00100
Xylenes, Total U 0.000174 0.00300
(S) Toluene-d8 110 80.0-120
(S) 4-Bromofluorobenzene 101 77.0-126
(S) 1,2-Dichloroethane-d4 101 70.0-130
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R4093176-1 07/11/24 16:21 • (LCSD) R4093176-2 07/11/24 16:42
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 %%%%%
Ethylbenzene 0.00500 0.00472 0.00481 94.4 96.2 79.0-123 1.89 20
Xylenes, Total 0.0150 0.0138 0.0139 92.0 92.7 79.0-123 0.722 20
(S) Toluene-d8 109 109 80.0-120
(S) 4-Bromofluorobenzene 102 104 77.0-126
(S) 1,2-Dichloroethane-d4 101 102 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 SUMMARYWG2318601
Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 L1752277-01,02,03,04,05,06,07,08,09
Method Blank (MB)
(MB) R4092116-4 07/07/24 09:11
MB Result MB Qualifier MB MDL MB RDL
Analyte mg/l mg/l mg/l
TPH (GC/MS) Low Fraction 0.431 J 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 114 80.0-120
(S) 4-Bromofluorobenzene 103 77.0-126
(S) 1,2-Dichloroethane-d4 98.1 70.0-130
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R4092116-1 07/07/24 07:45 • (LCSD) R4092116-2 07/07/24 08:07
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 0.00412 0.00435 82.4 87.0 70.0-123 5.43 20
Toluene 0.00500 0.00474 0.00508 94.8 102 79.0-120 6.92 20
Ethylbenzene 0.00500 0.00494 0.00511 98.8 102 79.0-123 3.38 20
Xylenes, Total 0.0150 0.0146 0.0152 97.3 101 79.0-123 4.03 20
Methyl tert-butyl ether 0.00500 0.00422 0.00433 84.4 86.6 68.0-125 2.57 20
Naphthalene 0.00500 0.00387 0.00305 77.4 61.0 54.0-135 J3 23.7 20
(S) Toluene-d8 111 111 80.0-120
(S) 4-Bromofluorobenzene 102 101 77.0-126
(S) 1,2-Dichloroethane-d4 98.9 99.6 70.0-130
Laboratory Control Sample (LCS)
(LCS) R4092116-3 07/07/24 08:28
Spike Amount LCS Result LCS Rec. Rec. Limits LCS Qualifier
Analyte mg/l mg/l %%
TPH (GC/MS) Low Fraction 5.00 4.49 89.8 66.0-132
(S) Toluene-d8 106 80.0-120
(S) 4-Bromofluorobenzene 108 77.0-126
(S) 1,2-Dichloroethane-d4 103 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 SUMMARYWG2318574
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 L1752277-03,04,05,06,07
Method Blank (MB)
(MB) R4092232-1 07/10/24 10:20
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 73.0 52.0-156
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R4092232-2 07/10/24 10:40 • (LCSD) R4092232-3 07/10/24 11:00
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 1.65 1.68 110 112 50.0-150 1.80 20
(S) o-Terphenyl 87.0 87.0 52.0-156
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 SUMMARYWG2319322
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 L1752277-01,02,08
Method Blank (MB)
(MB) R4092469-1 07/10/24 22:31
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 62.0 52.0-156
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R4092469-2 07/10/24 22:52 • (LCSD) R4092469-3 07/10/24 23:12
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 1.45 1.50 96.7 100 50.0-150 3.39 20
(S) o-Terphenyl 70.5 70.5 52.0-156
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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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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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
B The same analyte is found in the associated blank.
J The identification of the analyte is acceptable; the reported value is an estimate.
J3 The associated batch QC was outside the established quality control range for precision.
Q Sample was prepared and/or analyzed past holding time as defined in the method. Concentrations should be
considered minimum values.
Z1 The identification of the analyte is acceptable; the reported value is an estimate.
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
Alaska 17-026 Nevada TN000032021-1
Arizona AZ0612 New Hampshire 2975
Arkansas 88-0469 New Jersey–NELAP TN002
California 2932 New Mexico ¹TN00003
Colorado TN00003 New York 11742
Connecticut PH-0197 North Carolina Env375
Florida E87487 North Carolina ¹DW21704
Georgia NELAP North Carolina ³41
Georgia ¹923 North Dakota R-140
Idaho TN00003 Ohio–VAP CL0069
Illinois 200008 Oklahoma 9915
Indiana C-TN-01 Oregon TN200002
Iowa 364 Pennsylvania 68-02979
Kansas E-10277 Rhode Island LAO00356
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
Maryland 324 Utah TN000032021-11
Massachusetts M-TN003 Vermont VT2006
Michigan 9958 Virginia 110033
Minnesota 047-999-395 Washington C847
Mississippi TN00003 West Virginia 233
Missouri 340 Wisconsin 998093910
Montana CERT0086 Wyoming A2LA
A2LA – ISO 17025 1461.01 AIHA-LAP,LLC EMLAP 100789
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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