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Home My WebLink AboutDERR-2025-003177Stantec Consulting Services Inc. 2890 East Cottonwood Parkway Suite 300, Salt Lake City UT 84121-7283 April 23, 2025 File: 203721870 Attention: Liberty Coe 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. Coe, 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 first quarter of 2025. Four quarterly groundwater monitoring and sampling events were approved under Work Plan and Budget (WP&B) NXK-07 on April 29, 2024. The first quarter 2025 sampling event is the final quarterly sampling event approved under WP&B NXK-07. The objectives of quarterly groundwater monitoring and sampling were 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 additional desktop study results assessing the possibility of off-site petroleum hydrocarbon sources contributing to the unexpected dissolved petroleum hydrocarbon concentration increases observed at the Site beginning in 2023. 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 reported during the closure of two 3,000-gallon new oil USTs and one 3,000-gallon used oil UST on June 24, 1994 based on strong petroleum odors and soil staining present in the UST excavation. The former Minit Lube USTs were in the northwest portion of the property (behind the automotive service facility) and were closed by removal. Release Site IPT was closed on December April 23, 2025 Page 2 of 7 Re: 7-Eleven Store No. 27074 – Quarterly Groundwater Monitoring Report 3185 Harrison Boulevard, Ogden, Utah Facility ID 1200120, Release Site NXK 22, 1994 based on limited soil impacts above the minimum screening levels at the time and no groundwater encountered. 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 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 Petroleum Storage Tank Branch. 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 ISLs and Tier 1 Screening Levels (TSLs). 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 potentially 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 backfill/native soils interface 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 material was also needed to backfill 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 the UTA bus rapid transit (BRT) Project construction along Harrison Boulevard. Well abandonment activities were conducted according to WP&B NXK-04. As of fall 2022, UTA BRT Project construction 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 April 23, 2025 Page 3 of 7 Re: 7-Eleven Store No. 27074 – Quarterly Groundwater Monitoring Report 3185 Harrison Boulevard, Ogden, Utah Facility ID 1200120, Release Site NXK logging and sampling activities. These activities were conducted according to WP&B NXK-05. Stantec conducted quarterly groundwater monitoring in 2023 under WP&B NXK-06. Due to the impacts of the UTA BRT project to the property and business, 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. Work conducted under WP&Bs NXK-01 through NXK-07 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.  Quarterly Groundwater Monitoring Report, 7-Eleven Store No. 27074, dated October 22, 2024.  Quarterly Groundwater Monitoring Report, 7-Eleven Store No. 27074, dated January 22, 2025. GROUNDWATER MONITORING METHODS On March 12 and 13, 2025, 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-3, MW-5R, MW-7, MW-8 and MW-9 were sampled on March 12, 2025, and MW-1 and MW-2R were sampled on March 13, 2025. 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 a YSI 556 Multiprobe system 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 collected into seven 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. April 23, 2025 Page 4 of 7 Re: 7-Eleven Store No. 27074 – Quarterly Groundwater Monitoring Report 3185 Harrison Boulevard, Ogden, Utah Facility ID 1200120, Release Site NXK Stantec also collected/submitted the following quality assurance/quality control (QA/QC) samples.  Blind field duplicate (DUP-01) from MW-2R  Trip blank Samples were submitted for analysis of methyl tertiary-butyl ether, benzene, toluene, ethylbenzene, total xylenes, and naphthalene (MBTEXN) by United States Environmental Protection Agency (EPA) Method 8260B and TPH-GRO and TPH-DRO by EPA Method 8015D. The trip blank was only analyzed for 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 COC documentation are included as Attachment 1. GROUNDWATER MONITORING RESULTS On March 12 and 13, 2025, shallow groundwater beneath the Site was measured at depths ranging from 9.37 (MW-2R) to 11.96 (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 first quarter of 2025 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 increased by 1.13 to 3.8 feet between the December 2024 and March 2025 monitoring events. The overall March 2025 groundwater elevation was the highest since monitoring began in November 2020.  For the groundwater sample collected from MW-1, the dissolved benzene, ethylbenzene, and TPH-GRO concentrations were above the respective ISLs. The dissolved TPH-DRO concentration was above the TSL of 10 mg/L.  The dissolved TPH-DRO concentration in MW-3 was above the ISL.  For the groundwater sample collected from MW-2R, the dissolved benzene and TPH-GRO concentrations remain below the ISLs, and the TPH-DRO concentration decreased below the ISL.  The dissolved TPH-DRO concentrations in MW-5R, MW-7, MW-8, and MW-9 all remain below the ISL.  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 results.  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 laboratory RLs were below the respective ISLs for this sampling event. CONTINUED OFF-SITE SOURCE DESKTOP STUDY As described in the fourth quarter 2024 groundwater monitoring report, two of the three data gaps identified in the summary of the off-site source desktop study submitted with the third quarter 2024 groundwater monitoring report remained to be addressed: April 23, 2025 Page 5 of 7 Re: 7-Eleven Store No. 27074 – Quarterly Groundwater Monitoring Report 3185 Harrison Boulevard, Ogden, Utah Facility ID 1200120, Release Site NXK  The nature of the original commercial structure first observed at the Site as of 1962 aerial photography could not be distinguished with certainty.  Whether or not diesel was associated with the original commercial structure was unknown. Stantec reviewed city directories from 1925 to 2020 for the Site area provided by Environmental Data Resources, Inc. in an effort to identify the nature of the original commercial structure that was first observed in aerial photographs from 1962. Previous business establishments at the Site address listed in the city directories are identified as follows:  1986 – Pro Lube Service Gas Station  1981 – Woody’s Amoco Gas Station  1976, 1972, and 1967 – Ron’s American Oil Service Gas Station The Site address was not listed in the 1962 and earlier directories. The city directory findings indicate that the Site has been used as a fueling/lubricant oil service station since at least 1967. While the type and location of historical USTs at the Site is not clear, the possibility of diesel fuel storage and a diesel release contributing to current TPH-DRO concentrations at the Site cannot be ruled out. City directory findings coupled with information presented in the Minit Lube UST closure notice and Release Site IPT closure memo suggest the presence of previous fuel USTs at the Site property (see documents for Release Site IPT in Attachment 2). Samples collected during the UST closure activities at the former Minit Lube facility were not analyzed for TPH-GRO or TPH-DRO as the USTs stored new and used oil. Soil analytical results shown in Table 2 provide further evidence that the current TPH-DRO concentrations are not associated with Release Site NXK. Initial subsurface investigation soil analytical results indicated benzene concentrations above the ISL at the original MW-2 location at a depth of 12.5 feet below ground surface (bgs) and TPH-GRO concentrations above the ISL at the original MW-4 location at a depth of 13.5 feet bgs. UST closure soil analytical results also indicate that the gasoline release associated with Release Site NXK impacted soils at depths between 12.5 and 14 feet bgs. UST closure and remedial excavation soil sample locations are shown on Figure 6. Samples collected during the 7-Eleven UST closure activities were not analyzed for TPH-DRO as 7-Eleven’s USTs stored gasoline. In contrast, soil analytical results at replacement well locations MW-2R and MW-5R indicate higher TPH-DRO concentrations than TPH-GRO concentrations at depths between 9.1 and 9.5 feet bgs. This suggests a separate diesel release may have occurred under higher historical water table conditions. CONCLUSIONS AND RECOMMENDATIONS The information compiled for the desktop study to date identifies previous retail fuel sales at the Site. The diesel constituents found in the groundwater at the Site may be attributed to releases that occurred before 7-Eleven began leasing the property in 1986 and are likely not related to 7-Eleven’s gasoline operations. Dissolved petroleum hydrocarbon concentrations versus time for select wells are shown in the attached Graphs. At MW-1, the dissolved concentrations TPH-GRO and TPH-DRO continued to follow the trend of groundwater elevation and exhibited the highest detected concentrations since November 2020, while the dissolved concentrations of benzene and ethyl benzene have gradually decreased since September 2024. At MW-2R, all detected hydrocarbon constituents have continued to attenuate and are now below the respective ISLs. April 23, 2025 Page 6 of 7 Re: 7-Eleven Store No. 27074 – Quarterly Groundwater Monitoring Report 3185 Harrison Boulevard, Ogden, Utah Facility ID 1200120, Release Site NXK The dissolved TPH-DRO concentration in MW-3 increased above the TSL between December 2024 and March 2025. Dissolved TPH-DRO concentration increases in MW-1 and MW-3 may be due to the historical high groundwater table in March 2025 interacting with the presumed diesel release source area at a depth of approximately 9.5 feet bgs. TPH-DRO groundwater concentrations appear to attenuate before reaching downgradient wells MW-7 and MW-8. Dissolved TPH-GRO, benzene, and ethylbenzene impacts are still present above ISLs in MW-1. These impacts are present within 30 feet of the on-site convenience store building and buried utility lines. However, TPH-GRO, benzene, and ethylbenzene impacts observed at MW-1 appear to attenuation before reaching downgradient well MW-7. The first quarter 2025 quarterly groundwater monitoring event was the final monitoring event approved under WP&B NXK-07. Based on the current dataset and the following observations, Stantec recommends Release Site NXK be considered for closure:  The Release Site NXK source area was adequately excavated following the removal of the 7-Eleven USTs in 2021 as indicated by excavation confirmation samples.  Remaining dissolved TPH-GRO, benzene, and ethylbenzene concentrations above ISLs appear to attenuate before reaching downgradient wells.  On-site TPH-DRO concentrations do not appear to be associated with Release Site NXK. 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 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. April 23, 2025 Page 7 of 7 Re: 7-Eleven Store No. 27074 – Quarterly Groundwater Monitoring Report 3185 Harrison Boulevard, Ogden, Utah Facility ID 1200120, Release Site NXK 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. Ally Auffermann, PE Environmental Engineer Phone: (801) 617 3211 ally.auffermann@stantec.com 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 March 2025 Figure 3 Dissolved Benzene Isoconcentration Map March 2025 Figure 4 Dissolved TPH-GRO Isoconcentration Map March 2025 Figure 5 Dissolved TPH-DRO Isoconcentration Map March 2025 Figure 6 UST Closure and Remedial Excavation Sample Location Map Table 1 Groundwater Analytical Results Table 2 Soil 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 Release Site IPT Documents c. File / 7-Eleven Inc. John Wainwright, Stantec dbs \\US0395-PPFSS01\Workgroup\2037\Active\203721870\05_report_deliv\deliverable\reports\qgwmr_20250422\fnl_rpt_qgwm_27074_20250423.docx FIGURES MW-1 MW-3 MW-7 3200 SOUTH HA R R I S O N B O U L E V A R D 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 T E R STORE NO. 27074 FORMER UST BASIN FORMER SIGN FORMER PLANTER FORMER PLANTER FORMER PLANTER FO R M E R PL A N T E R 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 HA R R I S O N B O U L E V A R D FORMER CANOPY/ DISPENSERS CONVENIENCE STORE BUILDING AUTOMOTIVE SERVICE FACILITY T T PLANTER UE UE UE UE UE UE UE PL A N T E R STORE NO. 27074 FORMER UST BASIN FO R M E R PL A N T E R MW-6 MW-2 MW-5 MW-4 MW-2R 88.20 MW-9 88.64 MW-8 85.44 MW-5R 89.46 MW-7 83.54 MW-1 87.99MW-3 85.57 203721870 CCL AWA AMS 04/18/2025 2STORE #27074 3185 HARRISON BOULEVARD OGDEN, UTAH FOR: JOB NUMBER:DRAWN BY:CHECKED BY:APPROVED BY:DATE: FILEPATH:\\US0395-PPFSS01\Workgroup\2037\Active\203721870\05_report_deliv\drawings_design\cad_fig\4Q 2024\FIG 2_7-11_27074_GWE CONTOUR MAP.dwg | Layout Tab: 1Q25 | Drafter: cclee | Apr 18, 2025 at 11:02 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 ELEVEN 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 GROUNDWATER ELEVATION CONTOUR MAP MARCH 2025 86.86 GROUNDWATER SURFACE ELEVATION (FEET ABOVE MEAN SEA LEVEL) GROUNDWATER ELEVATION CONTOUR (DASHED WHERE INFERRED)85 8 4 8 9 8 8 8 7 8 6 8 5 84 8 5 8 6 8 7 88 3200 SOUTH HA R R I S O N B O U L E V A R D FORMER CANOPY/ DISPENSERS CONVENIENCE STORE BUILDING AUTOMOTIVE SERVICE FACILITY T T PLANTER UE UE UE UE UE UE UE PL A N T E R STORE NO. 27074 FORMER UST BASIN FO R M E R PL A N T E R MW-6 MW-2 MW-5 MW-4 MW-2R 0.00287 MW-9 <0.00100 MW-8 <0.00100 MW-5R <0.00100 MW-7 <0.00100 MW-1 0.146MW-3 <0.00100 203721870 CCL AWA AMS 04/18/25 3STORE #27074 3185 HARRISON BOULEVARD OGDEN, UTAH FOR: JOB NUMBER:DRAWN BY:CHECKED BY:APPROVED BY:DATE: FILEPATH:\\US0395-PPFSS01\Workgroup\2037\Active\203721870\05_report_deliv\drawings_design\cad_fig\4Q 2024\FIG 3_7-11_27074_BENZENE MAP.dwg | Layout Tab: 1Q25 | Drafter: cclee | Apr 18, 2025 at 10:56 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 MARCH 2025 0.0129 DISSOLVED BENZENE CONCENTRATION MILLIGRAMS PER LITER (mg/L) INFERRED BENZENE ISOCONCENTRATION CONTOUR (mg/L)0.3 <ANALYTE NOT DETECTED ABOVE THE SPECIFIED LABORATORY REPORTING LIMIT ELEVEN 0.005 3200 SOUTH HA R R I S O N B O U L E V A R D FORMER CANOPY/ DISPENSERS CONVENIENCE STORE BUILDING AUTOMOTIVE SERVICE FACILITY T T PLANTER UE UE UE UE UE UE UE PL A N T E R STORE NO. 27074 FORMER UST BASIN FO R M E R PL A N T E R MW-6 MW-2 MW-5 MW-4 MW-2R 0.782 MW-9 <0.100 MW-8 <0.100 MW-5R <0.100 MW-7 0.512 MW-1 5.80MW-3 0.395 203721870 CCL AWA AMS 04/18/2025 4STORE #27074 3185 HARRISON BOULEVARD OGDEN, UTAH FOR: JOB NUMBER:DRAWN BY:CHECKED BY:APPROVED BY:DATE: FILEPATH:\\US0395-PPFSS01\Workgroup\2037\Active\203721870\05_report_deliv\drawings_design\cad_fig\4Q 2024\FIG 4_7-11_27074_GRO ISOCON MAP.dwg | Layout Tab: 1Q25 | Drafter: cclee | Apr 18, 2025 at 10:58 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 MARCH 2025 10.5 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 HA R R I S O N B O U L E V A R D FORMER CANOPY/ DISPENSERS CONVENIENCE STORE BUILDING AUTOMOTIVE SERVICE FACILITY T T PLANTER UE UE UE UE UE UE UE PL A N T E R STORE NO. 27074 FORMER UST BASIN FO R M E R PL A N T E R MW-6 MW-2 MW-5 MW-2R 0.798 MW-9 0.250 MW-8 0.333 MW-5R 0.298 MW-7 0.769 MW-1 21.2 MW-4 MW-3 1.38 203721870 CCL AWA AMS 04/18/2025 5STORE #27074 3185 HARRISON BOULEVARD OGDEN, UTAH FOR: JOB NUMBER:DRAWN BY:CHECKED BY:APPROVED BY:DATE: FILEPATH:\\US0395-PPFSS01\Workgroup\2037\Active\203721870\05_report_deliv\drawings_design\cad_fig\4Q 2024\FIG 5_7-11_27074_DRO ISOCON MAP.dwg | Layout Tab: 1Q25 | Drafter: cclee | Apr 18, 2025 at 13:38 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 0 30 60 APPROXIMATE SCALE IN FEET ABANDONED MONITORING WELL LOCATION DISSOLVED TPH-DRO ISOCONCENTRATION MAP MARCH 2025 4.07 DISSOLVED TPH-DRO CONCENTRATION MILLIGRAMS PER LITER (mg/L) INFERRED TPH-DRO ISOCONCENTRATION CONTOUR (mg/L) <ANALYTE NOT DETECTED ABOVE THE SPECIFIED LABORATORY REPORTING LIMIT ELEVEN 1 10 SS-5/USC-2@3.0' SS-1/USC-1@12.5' SWC@13.5-14.0' SS-2@12.5' NWC@13.5-14.0'SS-3@12.5' SS-4@12.5' SEC@13.5-14.0' SS-7@3.0' SOIL SAMPLE LOCATION (See Table 1 for Analytical Results) EX-CEN@13.5-14.0' SS-6@3.0' MW-7 JW UST Closure and Remedial Excavation Sample Location Map 6 TABLES 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 12/12/24 10.81 86.86 <0.00505 0.185 <0.00500 0.959 <0.150 0.0516 Z1 2.74 4.07 03/13/25 9.68 87.99 <0.00505 0.146 <0.0500 0.756 <0.150 0.381 C3 5.80 21.2 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 12/12/24 13.21 84.36 <0.00500 0.00415 Z1 <0.00500 0.108 <0.0150 <0.0250 0.552 1.29 03/13/25 9.37 88.20 <0.00500 0.00287 Z1 <0.00500 0.104 <0.0150 <0.0250 C3 0.782 0.798 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 12/11/24 13.34 84.19 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 0.349 0.790 03/12/25 11.96 85.57 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 C3 0.395 1.38 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 12/11/24 11.41 88.11 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.100 0.213 03/12/25 10.06 89.46 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 C3 <0.100 0.298 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 MW-2R UDEQ DERR Tier 1 Screening Level MW-4# MW-5# MW-6# UDEQ DERR Initial Screening Level MW-5R 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) 1 of 3 Stantec Consulting Services Inc.fnl_dbs_27074_20250312-13.xlsx Water 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 12/11/24 12.74 82.26 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 0.384 0.600 03/12/25 11.46 83.54 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 C3 0.512 0.769 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 12/12/24 12.26 84.01 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.100 0.169 03/12/25 10.83 85.44 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 C3 <0.100 0.333 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 12/12/24 11.32 87.33 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.100 0.313 03/12/25 10.01 88.64 <0.00100 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 C3 <0.100 0.250 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 (%)-- -- ---- 5% -- 11% 1% -- -- 7% 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 (%)-- -- ---- 23% 22% 12% 21% 0% 68% 118% 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 (%)-- -- ---- 7% 23% 16% 20% 36% 3% -- 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 (%)-- -- ---- 40% -- 10% 11% 33% 145% 63% 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% DUP-01 (MW-1)12/12/24 -- --<0.00100 0.158 0.00140 1.01 0.0163 0.0456 4.24 4.40 RPD (%)-- -- ---- 8% -- 29% -- 157% 31% 131% DUP-1 (MW-2R)03/13/25 -- --<0.00100 0.00177 <0.00100 0.0781 <0.00300 <0.00500 C3 0.397 0.729 RPD (%)-- -- ---- 47% -- 28% -- -- 65% 9% 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 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 Well ID 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 2 of 3 Stantec Consulting Services Inc.fnl_dbs_27074_20250312-13.xlsx Water 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. C3 = The reported concentration is an estimate. The continuing calibration standard associated with this data responded low. Method sensitivity check is acceptable. 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. ▪The fourth quarter 2024 groundwater monitoring and sampling event was conducted on December 11 and 12. All depth to water measurements were collected on December 11. fnl_dbs_27074_20250312-13.xlsx Water 3 of 3 Stantec Consulting Services Inc. 10.0 10/26/20 67.8 <0.0975 <0.0487 <0.0487 0.911 0.403 2.52 107 55.8 12.5 10/26/20 48.2 <0.00887 0.0592 <0.00443 0.0773 0.00924 0.0328 <0.465 <0.972 20.0 10/26/20 1.2 <0.00996 <0.00498 <0.00498 <0.00498 <0.00498 <0.00498 <0.467 <0.971 10.0 10/26/20 20.2 <0.00855 <0.00427 <0.00427 0.0173 <0.00427 0.0483 <0.447 1.16 12.5 10/26/20 69.4 <0.0982 0.296 <0.0491 0.563 <0.0491 0.142 2.79 1.07 20.0 10/26/20 82.2 <0.00924 0.0191 <0.00462 0.0600 0.0221 0.0402 <0.500 <0.985 15.0 10/27/20 133.0 <0.00855 <0.00427 <0.00427 <0.00427 <0.00427 <0.00427 1.16 <0.981 16.0 10/27/20 25.8 <0.00949 0.0233 <0.00474 0.0307 <0.00474 0.0100 1.35 <0.977 20.0 10/27/20 0.9 <0.00986 <0.00493 <0.00493 <0.00493 <0.00493 <0.00493 <0.493 <0.975 11.5 10/27/20 622.0 <0.00945 0.0662 <0.00473 0.114 <0.00473 <0.00473 1.49 1.01 13.5 10/27/20 -- <0.191 0.146 <0.0956 2.17 <0.0956 2.44 519 34.4 17.0 10/27/20 294.0 <0.0992 0.172 <0.0496 0.476 0.101 0.0935 49.4 3.80 20.0 10/27/20 13.3 <0.00977 <0.00488 <0.00488 <0.00488 <0.00488 <0.00488 <0.488 <0.996 12.5 10/27/20 1.3 <0.00963 <0.00482 <0.00482 <0.00482 <0.00482 <0.00482 1.28 <0.989 20.0 10/27/20 1.0 <0.00846 <0.00423 <0.00423 <0.00423 <0.00423 <0.00423 <0.478 <0.973 12.5 10/26/20 0.1 <0.00849 <0.00424 <0.00424 <0.00424 <0.00424 <0.00424 <0.462 <0.974 20.0 10/26/20 0.1 <0.00973 <0.00486 <0.00486 <0.00486 <0.00486 <0.00486 <0.443 <0.987 12.5 10/27/20 1.3 <0.00921 <0.00460 <0.00460 <0.00460 <0.00460 <0.00460 <0.465 <0.984 15.0 10/27/20 36.5 <0.00890 <0.00445 <0.00445 <0.00445 <0.00445 <0.00445 <0.463 <0.981 20.0 10/27/20 23.5 <0.00949 <0.00474 <0.00474 <0.00474 <0.00474 <0.00474 <0.435 <0.975 9.0 02/07/23 9.1 <0.00109 0.00361 0.00559 0.00172 0.00600 0.00688 0.635 415 16.0 02/07/23 <0.00129 0.0202 0.00763 0.0597 0.0215 0.0278 0.903 <5.16 17.0 02/07/23 <0.00123 0.00328 <0.00615 0.00590 0.0141 <0.00615 <0.615 <4.92 8.0 02/07/23 <0.00122 0.00308 <0.00608 0.00124 0.00371 <0.00608 <0.608 <4.87 9.5 02/07/23 <0.12 <0.12 <0.29 <0.29 1.07 2.59 169 708 12.5 02/07/23 13.5 <0.00127 0.00336 <0.00634 0.00747 0.00870 0.136 1.80 <5.07 15.0 02/08/23 0.0 <0.00123 0.00247 <0.00615 <0.00123 0.00405 <0.00615 <0.615 <4.92 20.0 02/08/23 0.0 <0.00127 0.00297 <0.00634 <0.00127 <0.00380 <0.00634 <0.634 <5.07 15.0 02/07/23 1.7 <0.00114 0.00287 <0.00571 0.00119 0.00462 <0.00571 <0.571 <4.57 20.0 02/07/23 0.1 <0.00126 0.00493 0.00716 0.00178 0.00659 <0.00630 <0.630 <5.04 0.3 0.2 9 5 142 51 150 500 0.3 0.9 25 23 142 51 1,500 5,000 Explanation of Abbreviations bgs = below ground surface DERR = Department of Environmental Response and Remediation MBTEXN = methyl tertiary-butyl ether, benzene, toluene, ethylbenzene, total xylenes, and naphthalene mg/Kg = milligrams per kilogram MTBE = methyl tertiary-butyl ether ppmV = part per million by volume 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 Notes ▪The ISTD response or retention time was outside acceptable limits for the MBTEXN results of MW-1-12.5, MW-2-10, MW-3-16, MW-5-12.5, MW-5 TPH-GRO (mg/Kg)MTBE (mg/Kg) MBTEXN Compounds MW-4 Depth (feet bgs) 3185 Harrison Boulevard, Ogden, Utah 7-Eleven Store No. 27074 Soil Analytical Results Table 2 TPH-DRO (mg/Kg) Subsurface Investigation Results MW-3 Total Xylenes NaphthaleneToluene Ethylbenzene Date Sampled UDEQ DERR Tier 1 Screening Level UDEQ DERR Initial Screening Level MW-2 MW-1 Benzene PID (ppmV) Sample Location MW-7 MW-2R MW-5R MW-9 249.9 Replacement Wells Installation Results MW-8 180.7 MW-6 fnl_dbs_27074_20250312-13.xlsx Soil 1 of 1 Stantec Consulting Services Inc. GRAPHS 9 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 No v - 2 4 Fe b - 2 5 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 9 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 No v - 2 4 Fe b - 2 5 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 9 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 Oc t - 2 4 Ja n - 2 5 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 9 10 11 12 13 14 15 160.1 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 No v - 2 4 Fe b - 2 5 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 9 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 No v - 2 4 Fe b - 2 5 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. 9 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 No v - 2 4 Fe b - 2 5 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. 9 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 Oc t - 2 4 Ja n - 2 5 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 and 9/12/24 results. 9 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 No v - 2 4 Fe b - 2 5 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 11 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 Oc t - 2 4 De c - 2 4 Ma r - 2 5 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 11 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 Oc t - 2 4 Ja n - 2 5 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 11 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 No v - 2 4 Fe b - 2 5 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 9 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 Oc t - 2 4 Ja n - 2 5 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. 9 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 Oc t - 2 4 Ja n - 2 5 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 Au g - 2 4 No v - 2 4 Fe b - 2 5 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 Au g - 2 4 No v - 2 4 Fe b - 2 5 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 10 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 c - 2 4 Ma r - 2 5 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 6 7-Eleven Store No. 27074 MW-8 TPH-DRO Concentration vs. Time ISL TSL TPH-DRO Depth to Groundwater 9 10 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 c - 2 4 Ma r - 2 5 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 7 7-Eleven Store No. 27074 MW-9 TPH-DRO Concentration vs. Time ISL TSL TPH-DRO Depth to Groundwater ATTACHMENT 1 Laboratory Report and Chain-of-Custody Documentation ANALYTICAL REPORT March 30, 2025 711 Stantec - Salt Lake City, UT Sample Delivery Group:L1836618 Samples Received:03/15/2025 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: March 30, 2025 [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 L1836618 03/30/25 14:26 1 of 21 March 30, 2025 Marty Edwards III Project Manager ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 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-3 L1836618-01 6 MW-5R L1836618-02 7 MW-1 L1836618-03 8 MW-2R L1836618-04 9 MW-7 L1836618-05 10 MW-8 L1836618-06 11 MW-9 L1836618-07 12 DUP-1 L1836618-08 13 TRIP BLANK L1836618-09 14 Qc: Quality Control Summary 15 Volatile Organic Compounds (GC) by Method 8015D/GRO 15 Volatile Organic Compounds (GC/MS) by Method 8260B 16 Semi-Volatile Organic Compounds (GC) by Method 8015D 18 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: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:26 2 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 2 of 21 SAMPLE SUMMARY Collected by Collected date/time Received date/time MW-3 L1836618-01 GW Andrew Huffman 03/12/25 15:00 03/15/25 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC) by Method 8015D/GRO WG2471920 1 03/19/25 17:42 03/19/25 17:42 ADM Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2470782 1 03/17/25 20:49 03/17/25 20:49 WHS Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015D WG2473527 1 03/21/25 07:24 03/24/25 20:32 CAH Mt. Juliet, TN Collected by Collected date/time Received date/time MW-5R L1836618-02 GW Andrew Huffman 03/12/25 16:30 03/15/25 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC) by Method 8015D/GRO WG2471920 1 03/19/25 18:05 03/19/25 18:05 ADM Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2470782 1 03/17/25 21:09 03/17/25 21:09 WHS Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015D WG2473527 1 03/21/25 07:24 03/24/25 20:53 CAH Mt. Juliet, TN Collected by Collected date/time Received date/time MW-1 L1836618-03 GW Andrew Huffman 03/13/25 10:00 03/15/25 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC) by Method 8015D/GRO WG2471920 5 03/19/25 21:52 03/19/25 21:52 ADM Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2470782 50 03/18/25 01:14 03/18/25 01:14 WHS Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2471519 50 03/18/25 23:39 03/18/25 23:39 DYW Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015D WG2473527 5 03/21/25 07:24 03/27/25 14:15 MAA Mt. Juliet, TN Collected by Collected date/time Received date/time MW-2R L1836618-04 GW Andrew Huffman 03/13/25 11:00 03/15/25 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC) by Method 8015D/GRO WG2471920 1 03/19/25 18:28 03/19/25 18:28 ADM Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2470782 5 03/18/25 01:34 03/18/25 01:34 WHS Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015D WG2473527 1 03/21/25 07:24 03/24/25 21:15 CAH Mt. Juliet, TN Collected by Collected date/time Received date/time MW-7 L1836618-05 GW Andrew Huffman 03/12/25 14:00 03/15/25 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC) by Method 8015D/GRO WG2471920 1 03/19/25 18:50 03/19/25 18:50 ADM Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2470782 1 03/17/25 21:29 03/17/25 21:29 WHS Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015D WG2473527 1 03/21/25 07:24 03/24/25 21:38 CAH Mt. Juliet, TN Collected by Collected date/time Received date/time MW-8 L1836618-06 GW Andrew Huffman 03/12/25 15:45 03/15/25 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC) by Method 8015D/GRO WG2471920 1 03/19/25 19:13 03/19/25 19:13 ADM Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2470782 1 03/17/25 21:50 03/17/25 21:50 WHS Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015D WG2473527 1 03/21/25 07:24 03/24/25 22:00 CAH 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 L1836618 03/30/25 14:26 3 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 3 of 21 SAMPLE SUMMARY Collected by Collected date/time Received date/time MW-9 L1836618-07 GW Andrew Huffman 03/12/25 17:15 03/15/25 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC) by Method 8015D/GRO WG2471920 1 03/19/25 19:36 03/19/25 19:36 ADM Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2470782 1 03/17/25 22:11 03/17/25 22:11 WHS Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015D WG2473527 2 03/21/25 07:24 03/25/25 12:55 MAA Mt. Juliet, TN Collected by Collected date/time Received date/time DUP-1 L1836618-08 GW Andrew Huffman 03/12/25 00:00 03/15/25 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC) by Method 8015D/GRO WG2471920 1 03/19/25 19:58 03/19/25 19:58 ADM Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2470782 1 03/17/25 22:31 03/17/25 22:31 WHS Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015D WG2473527 1 03/21/25 07:24 03/24/25 22:44 CAH Mt. Juliet, TN Collected by Collected date/time Received date/time TRIP BLANK L1836618-09 GW Andrew Huffman 03/12/25 00:00 03/15/25 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC) by Method 8015D/GRO WG2471920 1 03/19/25 14:38 03/19/25 14:38 ADM Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2470782 1 03/17/25 20:28 03/17/25 20:28 WHS 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 L1836618 03/30/25 14:26 4 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 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 L1836618-03 MW-1 8015D L1836618-05 MW-7 8015D 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 L1836618 03/30/25 14:26 5 of 21 Marty Edwards III Project Manager ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 5 of 21 SAMPLE RESULTS - 01 L1836618 MW-3 Collected date/time: 03/12/25 15:00 Volatile Organic Compounds (GC) by Method 8015D/GRO Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) Low Fraction 0.395 0.100 1 03/19/2025 17:42 WG2471920 (S) a,a,a-Trifluorotoluene(FID) 101 78.0-120 03/19/2025 17:42 WG2471920 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time Benzene ND 0.00100 1 03/17/2025 20:49 WG2470782 Toluene ND 0.00100 1 03/17/2025 20:49 WG2470782 Ethylbenzene ND 0.00100 1 03/17/2025 20:49 WG2470782 Total Xylenes ND 0.00300 1 03/17/2025 20:49 WG2470782 Methyl tert-butyl ether ND 0.00100 1 03/17/2025 20:49 WG2470782 Naphthalene ND C3 0.00500 1 03/17/2025 20:49 WG2470782 (S) Toluene-d8 100 80.0-120 03/17/2025 20:49 WG2470782 (S) 4-Bromofluorobenzene 109 77.0-126 03/17/2025 20:49 WG2470782 (S) 1,2-Dichloroethane-d4 96.2 70.0-130 03/17/2025 20:49 WG2470782 Semi-Volatile Organic Compounds (GC) by Method 8015D Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 1.38 0.100 1 03/24/2025 20:32 WG2473527 (S) o-Terphenyl 106 52.0-156 03/24/2025 20:32 WG2473527 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 L1836618 03/30/25 14:26 6 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 6 of 21 SAMPLE RESULTS - 02 L1836618 MW-5R Collected date/time: 03/12/25 16:30 Volatile Organic Compounds (GC) by Method 8015D/GRO Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) Low Fraction ND 0.100 1 03/19/2025 18:05 WG2471920 (S) a,a,a-Trifluorotoluene(FID) 101 78.0-120 03/19/2025 18:05 WG2471920 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time Benzene ND 0.00100 1 03/17/2025 21:09 WG2470782 Toluene ND 0.00100 1 03/17/2025 21:09 WG2470782 Ethylbenzene ND 0.00100 1 03/17/2025 21:09 WG2470782 Total Xylenes ND 0.00300 1 03/17/2025 21:09 WG2470782 Methyl tert-butyl ether ND 0.00100 1 03/17/2025 21:09 WG2470782 Naphthalene ND C3 0.00500 1 03/17/2025 21:09 WG2470782 (S) Toluene-d8 102 80.0-120 03/17/2025 21:09 WG2470782 (S) 4-Bromofluorobenzene 108 77.0-126 03/17/2025 21:09 WG2470782 (S) 1,2-Dichloroethane-d4 97.8 70.0-130 03/17/2025 21:09 WG2470782 Semi-Volatile Organic Compounds (GC) by Method 8015D Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 0.298 0.100 1 03/24/2025 20:53 WG2473527 (S) o-Terphenyl 103 52.0-156 03/24/2025 20:53 WG2473527 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 L1836618 03/30/25 14:26 7 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 7 of 21 SAMPLE RESULTS - 03 L1836618 MW-1 Collected date/time: 03/13/25 10:00 Volatile Organic Compounds (GC) by Method 8015D/GRO Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) Low Fraction 5.80 0.500 5 03/19/2025 21:52 WG2471920 (S) a,a,a-Trifluorotoluene(FID) 102 78.0-120 03/19/2025 21:52 WG2471920 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time Benzene 0.146 0.0500 50 03/18/2025 23:39 WG2471519 Toluene ND 0.0500 50 03/18/2025 01:14 WG2470782 Ethylbenzene 0.756 0.0500 50 03/18/2025 01:14 WG2470782 Total Xylenes ND 0.150 50 03/18/2025 01:14 WG2470782 Methyl tert-butyl ether ND 0.00505 50 03/18/2025 01:14 WG2470782 Naphthalene 0.381 C3 0.250 50 03/18/2025 01:14 WG2470782 (S) Toluene-d8 102 80.0-120 03/18/2025 01:14 WG2470782 (S) Toluene-d8 101 80.0-120 03/18/2025 23:39 WG2471519 (S) 4-Bromofluorobenzene 110 77.0-126 03/18/2025 01:14 WG2470782 (S) 4-Bromofluorobenzene 110 77.0-126 03/18/2025 23:39 WG2471519 (S) 1,2-Dichloroethane-d4 92.4 70.0-130 03/18/2025 01:14 WG2470782 (S) 1,2-Dichloroethane-d4 98.7 70.0-130 03/18/2025 23:39 WG2471519 Sample Narrative: L1836618-03 WG2470782: MTBE was reported to the MDL. Semi-Volatile Organic Compounds (GC) by Method 8015D Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 21.2 0.500 5 03/27/2025 14:15 WG2473527 (S) o-Terphenyl 153 52.0-156 03/27/2025 14:15 WG2473527 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 L1836618 03/30/25 14:26 8 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 8 of 21 SAMPLE RESULTS - 04 L1836618 MW-2R Collected date/time: 03/13/25 11:00 Volatile Organic Compounds (GC) by Method 8015D/GRO Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) Low Fraction 0.782 0.100 1 03/19/2025 18:28 WG2471920 (S) a,a,a-Trifluorotoluene(FID) 97.4 78.0-120 03/19/2025 18:28 WG2471920 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time Benzene 0.00287 Z1 0.000471 5 03/18/2025 01:34 WG2470782 Toluene ND 0.00500 5 03/18/2025 01:34 WG2470782 Ethylbenzene 0.104 0.00500 5 03/18/2025 01:34 WG2470782 Total Xylenes ND 0.0150 5 03/18/2025 01:34 WG2470782 Methyl tert-butyl ether ND 0.00500 5 03/18/2025 01:34 WG2470782 Naphthalene ND C3 0.0250 5 03/18/2025 01:34 WG2470782 (S) Toluene-d8 101 80.0-120 03/18/2025 01:34 WG2470782 (S) 4-Bromofluorobenzene 105 77.0-126 03/18/2025 01:34 WG2470782 (S) 1,2-Dichloroethane-d4 94.4 70.0-130 03/18/2025 01:34 WG2470782 Sample Narrative: L1836618-04 WG2470782: Benzene was reported to the MDL. Semi-Volatile Organic Compounds (GC) by Method 8015D Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 0.798 0.100 1 03/24/2025 21:15 WG2473527 (S) o-Terphenyl 96.8 52.0-156 03/24/2025 21:15 WG2473527 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 L1836618 03/30/25 14:26 9 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 9 of 21 SAMPLE RESULTS - 05 L1836618 MW-7 Collected date/time: 03/12/25 14:00 Volatile Organic Compounds (GC) by Method 8015D/GRO Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) Low Fraction 0.512 0.100 1 03/19/2025 18:50 WG2471920 (S) a,a,a-Trifluorotoluene(FID) 101 78.0-120 03/19/2025 18:50 WG2471920 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time Benzene ND 0.00100 1 03/17/2025 21:29 WG2470782 Toluene ND 0.00100 1 03/17/2025 21:29 WG2470782 Ethylbenzene ND 0.00100 1 03/17/2025 21:29 WG2470782 Total Xylenes ND 0.00300 1 03/17/2025 21:29 WG2470782 Methyl tert-butyl ether ND 0.00100 1 03/17/2025 21:29 WG2470782 Naphthalene ND C3 0.00500 1 03/17/2025 21:29 WG2470782 (S) Toluene-d8 99.9 80.0-120 03/17/2025 21:29 WG2470782 (S) 4-Bromofluorobenzene 104 77.0-126 03/17/2025 21:29 WG2470782 (S) 1,2-Dichloroethane-d4 95.3 70.0-130 03/17/2025 21:29 WG2470782 Semi-Volatile Organic Compounds (GC) by Method 8015D Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 0.769 0.100 1 03/24/2025 21:38 WG2473527 (S) o-Terphenyl 107 52.0-156 03/24/2025 21:38 WG2473527 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 L1836618 03/30/25 14:26 10 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 10 of 21 SAMPLE RESULTS - 06 L1836618 MW-8 Collected date/time: 03/12/25 15:45 Volatile Organic Compounds (GC) by Method 8015D/GRO Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) Low Fraction ND 0.100 1 03/19/2025 19:13 WG2471920 (S) a,a,a-Trifluorotoluene(FID) 101 78.0-120 03/19/2025 19:13 WG2471920 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time Benzene ND 0.00100 1 03/17/2025 21:50 WG2470782 Toluene ND 0.00100 1 03/17/2025 21:50 WG2470782 Ethylbenzene ND 0.00100 1 03/17/2025 21:50 WG2470782 Total Xylenes ND 0.00300 1 03/17/2025 21:50 WG2470782 Methyl tert-butyl ether ND 0.00100 1 03/17/2025 21:50 WG2470782 Naphthalene ND C3 0.00500 1 03/17/2025 21:50 WG2470782 (S) Toluene-d8 104 80.0-120 03/17/2025 21:50 WG2470782 (S) 4-Bromofluorobenzene 104 77.0-126 03/17/2025 21:50 WG2470782 (S) 1,2-Dichloroethane-d4 101 70.0-130 03/17/2025 21:50 WG2470782 Semi-Volatile Organic Compounds (GC) by Method 8015D Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 0.333 0.100 1 03/24/2025 22:00 WG2473527 (S) o-Terphenyl 98.4 52.0-156 03/24/2025 22:00 WG2473527 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 L1836618 03/30/25 14:26 11 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 11 of 21 SAMPLE RESULTS - 07 L1836618 MW-9 Collected date/time: 03/12/25 17:15 Volatile Organic Compounds (GC) by Method 8015D/GRO Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) Low Fraction ND 0.100 1 03/19/2025 19:36 WG2471920 (S) a,a,a-Trifluorotoluene(FID) 100 78.0-120 03/19/2025 19:36 WG2471920 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time Benzene ND 0.00100 1 03/17/2025 22:11 WG2470782 Toluene ND 0.00100 1 03/17/2025 22:11 WG2470782 Ethylbenzene ND 0.00100 1 03/17/2025 22:11 WG2470782 Total Xylenes ND 0.00300 1 03/17/2025 22:11 WG2470782 Methyl tert-butyl ether ND 0.00100 1 03/17/2025 22:11 WG2470782 Naphthalene ND C3 0.00500 1 03/17/2025 22:11 WG2470782 (S) Toluene-d8 101 80.0-120 03/17/2025 22:11 WG2470782 (S) 4-Bromofluorobenzene 105 77.0-126 03/17/2025 22:11 WG2470782 (S) 1,2-Dichloroethane-d4 101 70.0-130 03/17/2025 22:11 WG2470782 Semi-Volatile Organic Compounds (GC) by Method 8015D Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 0.250 0.200 2 03/25/2025 12:55 WG2473527 (S) o-Terphenyl 74.7 52.0-156 03/25/2025 12:55 WG2473527 Sample Narrative: L1836618-07 WG2473527: Dilution due to matrix impact during extraction procedure. 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 L1836618 03/30/25 14:26 12 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 12 of 21 SAMPLE RESULTS - 08 L1836618 DUP-1 Collected date/time: 03/12/25 00:00 Volatile Organic Compounds (GC) by Method 8015D/GRO Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) Low Fraction 0.397 0.100 1 03/19/2025 19:58 WG2471920 (S) a,a,a-Trifluorotoluene(FID) 97.6 78.0-120 03/19/2025 19:58 WG2471920 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time Benzene 0.00177 0.00100 1 03/17/2025 22:31 WG2470782 Toluene ND 0.00100 1 03/17/2025 22:31 WG2470782 Ethylbenzene 0.0781 0.00100 1 03/17/2025 22:31 WG2470782 Total Xylenes ND 0.00300 1 03/17/2025 22:31 WG2470782 Methyl tert-butyl ether ND 0.00100 1 03/17/2025 22:31 WG2470782 Naphthalene ND C3 0.00500 1 03/17/2025 22:31 WG2470782 (S) Toluene-d8 99.6 80.0-120 03/17/2025 22:31 WG2470782 (S) 4-Bromofluorobenzene 104 77.0-126 03/17/2025 22:31 WG2470782 (S) 1,2-Dichloroethane-d4 96.9 70.0-130 03/17/2025 22:31 WG2470782 Semi-Volatile Organic Compounds (GC) by Method 8015D Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 0.729 0.100 1 03/24/2025 22:44 WG2473527 (S) o-Terphenyl 94.7 52.0-156 03/24/2025 22:44 WG2473527 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 L1836618 03/30/25 14:26 13 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 13 of 21 SAMPLE RESULTS - 09 L1836618 TRIP BLANK Collected date/time: 03/12/25 00:00 Volatile Organic Compounds (GC) by Method 8015D/GRO Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) Low Fraction ND 0.100 1 03/19/2025 14:38 WG2471920 (S) a,a,a-Trifluorotoluene(FID) 100 78.0-120 03/19/2025 14:38 WG2471920 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time Benzene ND 0.00100 1 03/17/2025 20:28 WG2470782 Toluene ND 0.00100 1 03/17/2025 20:28 WG2470782 Ethylbenzene ND 0.00100 1 03/17/2025 20:28 WG2470782 Total Xylenes ND 0.00300 1 03/17/2025 20:28 WG2470782 Methyl tert-butyl ether ND 0.00100 1 03/17/2025 20:28 WG2470782 Naphthalene ND C3 0.00500 1 03/17/2025 20:28 WG2470782 (S) Toluene-d8 104 80.0-120 03/17/2025 20:28 WG2470782 (S) 4-Bromofluorobenzene 110 77.0-126 03/17/2025 20:28 WG2470782 (S) 1,2-Dichloroethane-d4 99.8 70.0-130 03/17/2025 20:28 WG2470782 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 L1836618 03/30/25 14:26 14 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 14 of 21 QUALITY CONTROL SUMMARYWG2471920 Volatile Organic Compounds (GC) by Method 8015D/GRO L1836618-01,02,03,04,05,06,07,08,09 Method Blank (MB) (MB) R4189288-3 03/19/25 12:34 MB Result MB Qualifier MB MDL MB RDL Analyte mg/l mg/l mg/l TPH (GC/FID) Low Fraction U 0.0314 0.100 (S) a,a,a-Trifluorotoluene(FID)100 78.0-120 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R4189288-1 03/19/25 10:17 • (LCSD) R4189288-2 03/19/25 11:28 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) Low Fraction 5.50 5.06 5.76 92.0 105 72.0-127 12.9 20 (S) a,a,a-Trifluorotoluene(FID) 104 106 78.0-120 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 L1836618 03/30/25 14:26 15 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 15 of 21 QUALITY CONTROL SUMMARYWG2470782 Volatile Organic Compounds (GC/MS) by Method 8260B L1836618-01,02,03,04,05,06,07,08,09 Method Blank (MB) (MB) R4187812-2 03/17/25 16:19 MB Result MB Qualifier MB MDL MB RDL Analyte mg/l mg/l mg/l Benzene U 0.0000941 0.00100 Toluene U 0.000278 0.00100 Ethylbenzene U 0.000137 0.00100 Total Xylenes U 0.000174 0.00300 Methyl tert-butyl ether U 0.000101 0.00100 Naphthalene U 0.00100 0.00500 (S) Toluene-d8 103 80.0-120 (S) 4-Bromofluorobenzene 103 77.0-126 (S) 1,2-Dichloroethane-d4 98.6 70.0-130 Laboratory Control Sample (LCS) (LCS) R4187812-1 03/17/25 15:18 Spike Amount LCS Result LCS Rec. Rec. Limits LCS Qualifier Analyte mg/l mg/l %% Benzene 0.00500 0.00440 88.0 70.0-123 Toluene 0.00500 0.00447 89.4 79.0-120 Ethylbenzene 0.00500 0.00435 87.0 79.0-123 Total Xylenes 0.0150 0.0141 94.0 79.0-123 Methyl tert-butyl ether 0.00500 0.00462 92.4 68.0-125 Naphthalene 0.00500 0.00330 66.0 54.0-135 (S) Toluene-d8 102 80.0-120 (S) 4-Bromofluorobenzene 112 77.0-126 (S) 1,2-Dichloroethane-d4 95.9 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: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:26 16 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 16 of 21 QUALITY CONTROL SUMMARYWG2471519 Volatile Organic Compounds (GC/MS) by Method 8260B L1836618-03 Method Blank (MB) (MB) R4188192-3 03/18/25 20:50 MB Result MB Qualifier MB MDL MB RDL Analyte mg/l mg/l mg/l Benzene U 0.0000941 0.00100 (S) Toluene-d8 105 80.0-120 (S) 4-Bromofluorobenzene 110 77.0-126 (S) 1,2-Dichloroethane-d4 101 70.0-130 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R4188192-1 03/18/25 19:48 • (LCSD) R4188192-2 03/18/25 20:09 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 0.00519 0.00610 104 122 70.0-123 16.1 20 (S) Toluene-d8 101 98.1 80.0-120 (S) 4-Bromofluorobenzene 111 107 77.0-126 (S) 1,2-Dichloroethane-d4 96.6 99.1 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: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:26 17 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 17 of 21 QUALITY CONTROL SUMMARYWG2473527 Semi-Volatile Organic Compounds (GC) by Method 8015D L1836618-01,02,03,04,05,06,07,08 Method Blank (MB) (MB) R4190158-3 03/24/25 14:05 MB Result MB Qualifier MB MDL MB RDL Analyte mg/l mg/l mg/l TPH (GC/FID) High Fraction U 0.0605 0.100 (S) o-Terphenyl 101 52.0-156 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R4190158-1 03/24/25 10:03 • (LCSD) R4190158-2 03/24/25 13:44 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 1.48 1.65 98.7 110 50.0-150 10.9 20 (S) o-Terphenyl 97.5 102 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: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:26 18 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 18 of 21 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 C3 The reported concentration is an estimate. The continuing calibration standard associated with this data responded low. Method sensitivity check is acceptable. 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 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:26 19 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 19 of 21 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 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:26 20 of 21 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203721870 L1836618 03/30/25 14:32 20 of 21 ATTACHMENT 2 Release Site ITP Documents MEMORANDUM TO: Bryan D. Whitaker, Manager i>^ Underground Storage Tank Branch THROUGH: Scott Manzano, Manager ft fi^" Leaking Underground Storage Tank Section FROM: James H. Martin, Project Manager Leaking Underground Storage Tank Section DATE: November 30, 1994 SUBJECT: Close-out of LUST site EIPT, Q-Lube, 3200 S. Harrison Blvd., Ogden, Utah Facility ID # 1200332 Transfer of all hardcopy LUST information to the UST notification case file. I have reviewed the file for the above-referenced facility, which includes information provided by the facility owner. My recommendation that no further action is required at the facility is based on the review of the information contained in the case file, after due consideration of the corrective action clean-up standards policy (e.g., Utah Administrative Code R311-211). I recommend that due to the confirmed release (e.g., contaminant levels above laboratory minimum detection levels), which I conclude to be relatively insignificant as outlined herein, no Reporting and Remediation compliance schedule(s) be sent to the responsible party, no LUST file be maintained other than the Revelation database LUST module file, and all LUST hardcopy information be filed in the UST notification case file. In addition, no closeout letter will be sent to the responsible party since the site has not been tracked as an active LUST site. A Lust Release/Spill Report was received by DERR on June 24, 1994 based upon odors and soil staining noted by the soil samplers during tank closure. The subsequent Closure Notice was processed by the DERR on November 21, 1994 by Paul Harding. The Closure Notice includes a site map and aiialytical results of soil samples collected in accordance with Utah Administrative Rules R311-204. A brief synopsis of the case file information collected during the removal of the tanks is presented below. Two new oil tanks and one used oil tank were removed from the site. All three tanks were 3000 gallon capacity and were approximately 8 years old. All tanks were in good condition when removed and there was no evidence of leakage from either the tanks or the piping. There were, however, strong petroleum odors emitting from the excavated soils during removal of the tanks. Based upon information supplied during tank removal it appears that there were some old tanks present at the site in the past. No information regarding the presence of these tanks is known at this time. All soil samples collected at the site showed low levels of BTEXN contamination. Only two soil samples exceeded Level I RCLs; Benzene at 0.26 mg/Kg and Naphthalene at 2.6 mg/Kg respectively (the Level I RCLs for Benzene and Naphthalene are 0.2 and 2.0 mg/Kg respectively). The native soils in the area were found to be lean clay. No groundwater was encountered. The concentration of contaminants were only slightly above the most stringent RCLs and the contamination appears to be from an earlier release (greater than eight years old), not from the present facility, and has not caused any problem to this date. Also, migration of any contaminants at this site would be highly limited by the presence of the native soil type, a lean clay (100% smaller than 0.075 mm). It does not appear that there is an impact to groundwater. Based upon this information it does not appear that this site poses a threat to human health or the environment. Therefore, it is recommended that no LUST case file be created for the above-referenced faciUty. This recommendation is based on a review limited to the information submitted which indicating that no significant petroleum contamination exists or remains on-site and does not appear to constitute a current or potential threat to human health or the environment. This recommendation for close-out is based on the condition that if future evidence indicates the existence of contamination that poses a threat to human health or the environment, at or emanating from this site, additional investigation and corrective action may be required. UNDERGROUND STORAGE TANK CLOSURE NOTICE (Revised 03/01/93) Facility ID # / ^ 00 '^^^ State use Date Processed i\ Z?-! Onlv /G<^l bv CQ.U- Date Mailed to LHD Samples in LUST RIe # Saniples to LUST Review_ fe \XX<\ XPT ai4A Closure Notice prepared at the request of the owner/operator (identified below) by. P-/.-1 c ^/'^-^ of (company name) ( fClP--fe f cl ^4\f,pDI"i^ • Pi-.-^txJ^ Soec • -J \~s-iS, Tr c . Phone # {fiO () ^8S^ 9^/^^ Address ^/S/ /Vv'- J^'P/Ti.Oood-/"T^r. \ ^City -^/ ^ State UT Zip_Jj/±^ FACILITY INFORMATION Tank Owner (/ fXC^ kn.^ r •S'-lfet^f /t1^ -• A^ -t^ -^^ , /Ol [ ] dba (individual doing business as) ( ] sole proprietorsfiip [ ] partnership [ ] corporation . Phone # L^£ZL£2£Z£2E^^ Address 133^ i.\J ^ ? €0 i^. citv ^>C ^^ State /z:zip_£^^ Facility Name Q -<^-u.v-) IC i Address 'S^z? ^"jc; ^/g y^, ^c^ ^/^cl Citv 0.c,c/p.ii State d/ ^ Zip ^V^O / Contact person Ca roj 6 j>. / /.in ,Phone#(^^A 9^j-_^-;7?, 2- Number of regulated tanks at tfie facility before closure: Number of regulated tanks at the facility after closure:_ 3 TYPE OF CLOSURE ^ Pemianent I ] Temporary [ J Change-ln-Service Pemianent or Chanoe-ln-Servlce [X] Fuel was emptied_ \>\ Sludge was removed [ \1 Tank was cleaned. Tank was: [><] Purged \p\ Inerted. Method Used: K^i.--Ac^/-P.. p<>^"^9e i.Lh r-P ^ P <^>^y :c ^ Location of Closure Records For in-place closure: tanks filled witfi. Substance to be stored for Change-ln-Service . Temporary \ ] Fuel was emptied. [ ] Conosion protection is operating. [ ] Release detection equipment is operating. Residue depth remaining in tank inches, or % by weight of total capacity of UST. 3 months: [ ] Vent lines open Cap/Secure: ( ] fines [ ] pumps [ J manways 12 months: [ ] Pennanentiy closed [ ] New/Upgraded I 1 Extension request TANKS CLOSED Tank# Age of tank Capacity Subs, stored* Date last usee Date closed Rmvd/ln place / 1 A^/A 1 f<C.Hinv.,.fi '^ $uCC> B ^V • 9^^"^ /^of?/ /A iJ-iUPPfi fr-2'>-o(.<iV * Indicate tfie specific substance stored in each tank closed (regular, unleaded, diesel. waste oil, etc.) TANK REMOVER Name Company l\' • { I, I I r~.U ... Cert. #TR 0/-''PExp. date.f^ /-^ (-' ( •A?->-'">:r,-'cc.''^""''p.'-^ Address ll JL -; .r Phone # (.>^^\/) ^-r/- r/-^-4 Citv PP-K i^r-y-,, ^ir-.-n- ^-^ State 'UP Zip_ T -?-.)• .^//.^^ ^. A ' V ? Cert. # GS/;'"-y-7o Exp. date_ SOIUGROUNDWATER SAMPLER Name ^__ _ Company ^)/iio-^-r^ ^S.^ ./,:':-•/^/^.^t.-^-?; /c,^e.n^-k.P>^^ Phone # f ^^-'^ ) '^ ^ ' - S ^A'- r. /hj_ /r^^ Address C3 ? A / / / ', ^'cni<Jt:x::c -I T-r . .City. -PIP ,state ^' / Zip ^^/: DISPOSAL SITES USED: Tank: "^^/C . /^C/c/W. Product from Tank: /"^ •>' Contaminated water from tank cleaning: P^iP.li.'^.P' rr-^P Sludge: Pp . Contaminated Water: Contaminated Soil: _ ^•1 ";? p6^./ ^'/ Number .-' Amount . Date. . Date .Date ^/Wi'"^^^ Amount 'o'' Date /\mount . Date Amount _ Date Amount Is any contaminated soil which was overexcavated still on site? v Yes No Not applicable SITE ASSESSMENT Complete the Facility Site Plat (Closure Notice) and Sample Infomiation Table (Closure Notice) on pages 3 and 4 to show the locations, depths, and other information on all soil/groundwater samples taken for closure. The sanples must be consistently klentified by sample ID # on the site plat, table, and lab analysis report. [X] Completed Facility Site Plat (Closure Notice) is attached. [y] Completed Sample Infomiation Table (Ctosure Notice) is attached. [ < ] Certified lab analytical environmental sample results are attached. [ \] Unified Soil Classification (USC) sample results are attached. [ <"] Chain of Custody form is attached. Samples were property: (;<1 Collected [ V] Labeled (X] Packaged [ A] Transported [V] Samples were in sight of the person in custody at all times or in a secured locked place. I certity under penalty of law that the closure site assessment at this facility was conducted In accordance with R311-202 (parts 280^2 and 280.72) and R311-205 UJLC, and that any additional samples required by R311-202 parts 280.52 and 280.72 and R311-205-2(a)(1) were property collected. Signature of Certified Groundwater/Soil Sampler .^/pu^^^/^^ -T^ Full name of Certified Sampler Alpir^ ^ f-''- i-C S .Date. 7^- P^'/^/^ / ^u- FACILITY SITE PLAT (CLOSURE NOTICE) The site plat must show locatjons of all buiklings, streets, property boundaries, tanks, piping, dispenser islands, atvi, underground utilities. The site plat must be drawn to an appropriate identified scale. It must show actual sampli.n: tocations, substances stored in tanks, and other relevant informatton. Tank and sample identification numbers must be consistent with the information given on p. 1 and 4 of the closure notice. Facility ID #/^ Jo.-?3^ Drawn By /~Pcx O <.PP^\ Date ::;t//f/^/- NORTH i<-— / / .r'— -y- i -P-P '^<".i. p- L-i-c 1= e so^ 4K ^-X toiivi. \]oP. /\il <'£!^(''^f'^S CtfVti^ n _// CiC^Soli're S Oc < "> o X = Sample tocations (SS-#. WS-#. USC-#) 0 = Monitoring Wells (MW-#,) O = Soil boring (B-#) • = Water Wells (domestic, livestock, etc.) SA^.E INFORMATION TABLE (Closure Not^ff Complete table for ali samples that were taken for closure. Sample ID numbers on the table must be consistent with the sample 10 numbers given on the site plat and in the iab analysis report. Sample #/Lab ID# Sub. stored Spl. type' Depth* Compounds' Analysis method(s)* r,\-yx ^nTljyH: ::\:;;^n, ^'-' I .U K75^ ^:--.^..-<..'JS'^~-^I^ I ^'°-^'. >-^i^ ^rrMgj ---^-.d-i,; ^J± ^ . f^ y-;^^,) .f:!.U; .^7?.! go.:i^, p,;:. ' Soil (SS). Groundwater (GW). or Unified Soil Classificatton (USC). * Final depth (in feet) betow grade at which samples were taken. ' Contaminant compound(s) analyzed for each sample (TPH, BTEXN, O&G, etc). * Appropriate analysis methods for contaminant compound(s) in each sample (8015 mod., 8020. 413.1. etc). State Certified Laboratory used: O^ ^/'/^'^^ '^-f" s^^'''-"' .Pc^l:>d rP-Qr^/ ' Address .? -^^ 9 CLP. .Tr .^^ P Citv^ P^- ^ State ^' Zip .-^'- Contact person ^-^^' ^^ '^'^fS&t^ Phone#( P^l^ 9^^- ^^OP" Please explain any unusual or extenuating circumstances encountered during the site assessment or ctosure: uTrO^r, Pi.Tr,)lf\i.^,y^ 'jlj.'J'-r -Pv^-^' Tl.g'-TXCa ^L-P^-P ^oP --/c'-y ./t -f a^<^ s^f» ii. -"^g^ ' o&iL'u-fi^ ii-t ^< /i^W-^ r/ -^f^H -y^j-^ ^^/^C/<a?a<^> I certify under penalty of law that I am the Owner of the tank(s) described above and that I am familiar wtth the Infomiation on this fonn and that It is tnje, accurate and complete and further, that the procedures described herein were foiiowed during tank closure. Signature of UST Owner Full name of Owner lunng tank cipsure. -7- Retum completed Ctosure Nottoe forni. Facility Site Plat and Sample Infonnatton Table. Soil/Groundwater sample lab analysis resutts. USC sample results, and Chain of Custody form within 90 days of UST Ctosure to: Slate of Utah Dept. of Environmental Quality Division of Environmental Response and Remediatton UST Section 150 North 1950 West 2nd Ffoor Satt Lake City. Utah 84116 Crawford Environmental Specialists, Inc. GEOTECHNICAL ENVIRONMENTAL SERVICE COMPANY July 18, 1994 Executive Secretary Department of Environmental Quality Division of Environmental Response and Remediation 168 North 1950 West SaltLakeCity, 84109 Subject: UST Closure Notice Q-Lube Store # 1023 Facility ID # 1200332 3200 South Harrison Blvd. Ogden, Utah CES Project No. 442057.3 Dear Sir/Madam: Crawford Environmental Specialists, Inc. (CES) has been retained by Q-Lube to collect soil and/or groundwater samples for the above subject Underground Storage Tank (UST) site. Two new oil tanks and one used oil tank were removed and disposed of for permanent UST closure. Please find enclosed the closure notice for this site. Complete analytical results have also been enclosed. UST Removal Operations On June 21, 1994, two new oil tanks (3,000 gallons each) and one used oil tank (3,000 gallons) were removed by W.L. Shelton Excavating Company as a subcontractor to Eaton Metal, Salt Lake City, Utah. The tank information can be found in the attached UST Closure Notice. Rick SheUon of Q-Lube and members ofthe Weber County Health Department and the Weber County Fire Department observed the tank removal operations. Soil Sampling and Analysis Five soil samples were collected by Mr. Alvin Miles, a certified Utah Soil and Groundwater Sampler (GS0720), under the tanks in native soil fi-om each comer ofthe tank pit and below the product pipes in native soil according to the Utah Administrative Code R311-205. The sample locations and depths for each sample can be found in the attached UST Closure Notice. All samples were sealed, labeled, immediately placed in cold storage with "blue ice", and subsequently transported under proper chain-of- custody procedures to Utility Testing Laboratory, Salt Lake City, Utah, an EPA and State-certified laboratory. Aromatic hydrocarbons: benzene, toluene, ethylbenzene, xylenes, and naphthalene (BTEXN, EPA Method 8020) were detected (see Table 1) from the five soil samples. No chlorinated solvents: vinyl chloride, TCE, DCE, etc. (EPA Method 8010) were detected above laboratory detection Umits from the soil samples. 361 IRONWOOD DRIVE SALT LAKE CITY, UT 84115 PHONE: 801 485-8400 FAX: 801 485-7208 UST Closure Notice Q-Lube Store » 1023 Facility ID Ul 200332 3200 South Harrison Blvd. Ogden, Utah CES Project No. 442057.3 Page 2 There was detectable Oil and Grease (O&G EPA Method 413.1) ranging from 48 ppm to 186 ppm in all five soil samples, SS1-SS5. Because the removed tanks did not contain gasoline or diesel fuel, total petroleum hydrocarbons (EPA method 8015 modified) were not analyzed for the collected soil samples. Table 1 Summary of Chemical Analysis Sample ID Level 1 RCL SSI SS2 SS3 SS4 SS5 Depth (feet) 12 12 12 12 12 O&G (ppb) 300,000 140,000 85,000 48,000 186,000 55,000 Benzene (PPb) 200 <50 <50 <50 261 50.9 Toluene (ppb) 100,000 974 82.4 61.8 114 43.8 Ethylbez-ene (Ppb) 70,000 6,980 749 112 <50 <25 Xylenes (Ppb) 1000,000 28,800 4,450 718 561 322 Naphthalene (Ppb) 2,000 2,590 519 209 , 365 95.4 Halocarbom (ppb) <50 <50 <50 <50. <25 . Note: Bold values are above Level 1 Recommended Cleanup Levels (RCLs). Nature of Release The three tanks visually appeared to be in a good condition. Observations made during removal operations revealed no evidence of leakage. However, there were strong petroleum odors emitted from the excavated soil during the tank removal operations. Organic vapor content of excavated soils was measured with a portable Organic Vapor Monitor (Model 580 B) during soil excavation and tank removal. Ms. Kate Johnson was immediately notified ofthe release on June 24, 1994 at 4:00 pm. For a Level 1 (highest environmental sensitivity) site, recommended cleanup levels (RCLs) for benzene was exceeded in SS4 (261 ppb), and napthalene was exceeded in SSI (2,590 ppb). Reportedly, there were old gasoline and/or diesel tanks located at the same location as the removed oil tanks. No fiirther information regarding the old gasoline/diesel tanks was not available at the time of performjince of our work. We recommend conducting a site investigation to define the vertical and horizontal extent ofthe hydrocarbon impacted soil and/or groundwater at the site. Unified Soil Classification One unified soil classification samples was analyzed by Utility Testing Laboratory. Results indicate that the subsurface soil on site consisted ofa brown lean clay (CL). UST Closure Notice Q-Lube Store U 1023 Facility ID tt 1200332 3200 South Harrison Blvd. Ogden, Utah CES Project No. 442057.3 Page 3 Limitation The UST Closure Notice is based on the analytical results from the actual locations sampled. Our services consist of professional opinions and recommendations made in accordance with generally accepted geotechnical and environmental engineering principles and practices in this area at the time of execution. This warranty is in lieu of all other warranties either expressed or implied. If any questions have arisen regarding this report, please feel free to contact the undersigned. Respectfiilly submitted, Crawford Environmental Specialists, Inc. Yi^ Hao Zhu Environmental Engineer Reviewed by: ll^ (t^QTtf^^'^^ \ barrTTCrawford, P.G^!; Environmental Division Manager Senior Hydrogeologist Enclosure: UST Closure Notice Laboratory Report SCANNED LUST RELEASE/SPILL REPORT PERR-I994-0{>ZS82--- Release Site No. /^^'^ -/-P'T Date Received tcSH// Fac ID No. \000332. Date A.ssignetl L (-jC)^ j^^f/. Project Manager Cn//l/y?iivT"/-^ - , Date Confinned (f -7'i '/T . Potential Psf-Fund Site? Ul/> - C^lg. \^ ©i^ 4fi^^ / Received by /oi^ \^WlgSC-V^ Time "^ ^'. ?0<^ Name of Reporting Paitv 1^>Q>»«> ^C/iO«^ ^0? Company (lmS^vc£> &lui/'g^^> Phone: "^ Name of PRP (current o/o) C^--U>.<2>fc. CQ;K)1 "BaUo-s Phone: '\^S'^.'nZ8. Name of Release Location "h^^ ^^ ^^•a^tVtf' > SHS Phone: Release site street address "^1*7^ V\^^/t!Stfv>> ^ Citv: (£)^>d.A»> Type of Release: (piping; sucuon/pressurized) 2^ tank (corrosion/fit^nes) spill/overflll pump island Release Date(s) Suspected or C^nfirrned?)Estimated Amount U.AA. • Method of Determination: failed TTT (volumetric/other) w/ leak rate of gai/hn Leak Detector Alarm Inventory loss ( gai); failed LTT (volumetnc/oiher) w/ leak rate of gal/hr Field Instnimeniation (Model/Type ) w/ maximum readings of units V Permanent Closure (in-place/removal) w/ _2^ soil staimng; ixlors: sheen on l-LO: .Analytical Analytical Results: Soil (mg/Kg) B T . E , X , N . TPH . O&G , TRH Anaiyticai ResuiLs: Water (ug/L) B , T , E . .X . N TPH . O&G , Solvents Substance Released ^ Gas (Li/Reg) Diesel jC Waste Oil ^New Oil Other (specify) .Native Soil Type cA^^^ry- ; Local GW flow direction : Regional GW flow direction RELEASE IMPACTS FUMES: Home Business Utilities Outdtwrs Soils Water ^Other (specify) DAMAGE: Groundwater (- ft BLS) Surtace Water* Drinking Water* Utiliues* Soils Land Surface* Biota/Wildlife* Free Product* 3rd party impacts* •EMERGENCY ABATEMENT ACTIONS TAKEN/NEEDED: ak^y- NON-EMERGENCY ACTIONS TAKEN/PLANNED: ^ 4^uJLo rg^ ^ T*^, I bPOo'^' )f\[aJi^ 5.^\(S> )St>t. Wc^Jb^ <M. qdtO yj»^ 'ne^^iJlupJ)^nA^ STAFF RECOMMENDATIONS- T:yTs.>r^)SflJiSV& . .^ {f^^rsf Rj-f^- -^iV oJK^J-p-f^ Agencies Notitied: ^ LHD/^ Fire Dept EPA Other CjJienciesOn^Sue? )xO LHD VFire Dept EPA Other State Risk Manager notitied ot 3rd party impacts (direct/potential) on: / hv:.