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HomeMy WebLinkAboutDERR-2024-004790 2410 WEST CALIFORNIA AVENUE • SALT LAKE CITY, UTAH 84104 PHONE (801) 972-8400 • FAX (801) 972-8459 Website: www.wasatch-environmental.com • e-Mail: wei@wasatch-environmental.com Mr. John Sawyer March 6, 2024 TP Lamplighter, LC Project Number: 2077-001M 1165 East Wilmington Avenue, Suite 275 Salt Lake City, Utah 84106 SUBJECT: Semi-Annual Groundwater Monitoring American Food Mart 1605 South Foothill Drive Salt Lake City, Utah UST Facility No. 4000803 Release Site NFS INTRODUCTION Wasatch Environmental, Inc., (Wasatch) has prepared the second semi-annual groundwater monitoring report for Facility I.D. No. 4000803, Release Site NFS (Site). The groundwater monitoring wells were sampled on February 15, 2024. BACKGROUND The Site was formerly occupied by the American Food Mart gasoline station and convenience store. The Site is part of a larger development that is identified as Lamplighter Square. The former on-Site gasoline station consisted of three underground storage tanks (USTs) and four fuel dispenser islands. One UST was a 10,000-gallon tank containing gasoline, one UST was a 6,000-gallon tank containing gasoline, and the third UST was a 6,000-gallon tank containing diesel. All USTs were constructed of reinforced fiberglass. Wasatch has completed several investigations at the Site, and the northwest dispenser island at the Site was determined to be the location of a release of petroleum hydrocarbons. Impacts to soil above the bedrock interface were identified in boring BH-1 at a depth of 14.5 feet below ground surface (bgs) during drilling and sampling activities conducted on January 5, 2015. The remaining borings near the dispenser islands and USTs (BH-2 through BH-7) did not exhibit petroleum impacts. The release was reported to the Utah Division of Environmental Response and Remediation (DERR) on January 23, 2015, when the analytical results were received. The facility was assigned as Release Site NFS, and the Utah DERR has determined that this release qualifies for cost recovery through the Petroleum Storage Tank (PST) Trust Fund. On February 3, 2015, Wasatch advanced four borings (BH-8 through BH-11) in the vicinity of BH-1 to characterize the lateral extent of soil impacts. However, the soil samples collected from borings BH-8 through BH-11 exhibited analyte concentrations above Utah Initial Screening Levels (ISLs), but the presence of bedrock at approximately 15 feet bgs prevented the collection of samples at depth to characterize the vertical extent of petroleum impacts in the area of boring BH-1. On March 9, 2015, Wasatch directed the completion of a subsurface boring, BH-12, located 4 feet west of boring BH-1 into bedrock and collected pulverized bedrock samples at depths of 23 and 38 feet bgs. The results of this bedrock sampling identified petroleum hydrocarbon impacts above the Utah ISLs at a depth of 23 feet; however, a sample collected at a depth of 38 feet was below the Utah ISLs for all analytes. Wasatch Environmental Inc. Page 2 In December 2015, Wasatch conducted a groundwater investigation at the Site. A groundwater monitoring well (MW-1) was installed north of the pump island canopy and within bedrock, to a depth of 130 feet bgs, and sampled. Petroleum hydrocarbons were identified in the groundwater at concentrations exceeding their applicable Utah ISLs or Risk-Based Corrective Action (RBCA) Tier 1 Screening Levels. The Utah DERR requested that additional monitoring wells be installed off-Site to investigate if the petroleum hydrocarbon impacts to groundwater have migrated away from the Site. Per Utah DERR requests, two off-Site groundwater monitoring wells (MW-2 and MW-3) were installed and sampled in 2019. The Utah DERR requested that quarterly groundwater monitoring be conducted for a minimum of one year. To further define the groundwater impacts, the Utah DERR requested that additional groundwater monitoring wells be installed on and off-Site. In 2020 and 2021, two rounds of monitoring well installation (monitoring wells MW-4 through MW-10), development, and sampling were completed by Wasatch. See Figure 1 for the monitoring well locations. Given the potential impacted soil exposure pathways, Wasatch recommended that the soil impacts be excavated and disposed of off-Site. Given that depth to groundwater is greater than 100 feet and that Wasatch determined that no groundwater impacts have reached potential receptors hydraulically downgradient; therefore, no exposure pathways are complete for known groundwater impacts. However, in an attempt to reduce the groundwater impacts at the Site, Wasatch recommended injecting PetroFix amendment through the monitoring wells that will likely be destroyed during construction. Ms. Avery Holyoak (former assigned DERR PST Fund project manager), was notified that it was our intention to excavate the soil impacts and inject amendment into the groundwater at the Site to obtain regulatory closure. Ms. Avery Holyoak agreed that this method would be appropriate for Site closure given the proposed redevelopment of the Site, and recommended a corrective action plan (CAP) be submitted for approval by the PST Fund. The submitted CAP was approved by DERR in a letter dated September 13, 2021, and detailed the proposed cleanup levels for remediation. Remediation of petroleum hydrocarbon impacts originating from the Site was completed in accordance with the approved CAP between January 2022 and September 2022. Remediation involved the injection of 4,000 pounds of PetroFix to reduce contaminant concentrations in groundwater and plume life, and the excavation and off-Site disposal of 396.35 tons of petroleum hydrocarbon-impacted soil from the Site. Prior to beginning the soil excavation activities at the Site, the American Food Mart building, and canopy were demolished and removed from the Site. Additionally, the UST system was properly removed and disposed. Wasatch followed the DERR-approved Closure Plan to complete the UST closure activities. Wasatch submitted the completed closure Notice to the DERR upon completion. The Site is scheduled for redevelopment in the near future. Given the proposed redevelopment of the Site, on August 3, 2023, Wasatch properly abandoned four source area groundwater monitoring wells (MW-1, MW-4, MW-5, and MW-6) at the Site. METHODOLOGY On February 15, 2024, Wasatch Staff Scientist Anna Fiorini (Utah Soil and Groundwater Sampler # GS 1788) and Wasatch Staff Geologist Rachael Kubina (Utah Soil and Groundwater Sampler # GS 1927) conducted groundwater monitoring activities at four groundwater monitoring wells (MW-3, MW-7, MW-8, and MW-9) located hydraulically downgradient of the Site. The groundwater monitoring activities included collecting groundwater samples for laboratory analysis from each of the aforementioned monitoring wells. The monitoring well locations are shown on Figure 1. Groundwater sampling was conducted using HydraSleeve (HS) sampling techniques. The initial sampling procedures involved deploying a HS no-purge sampler at the bottom of each monitoring well, so as to core water from the middle of the well screen. This procedure was completed at the end of the last sampling event on August 2, 2023. The sampling procedures began by quickly retrieving the HS sampler causing the sampler to core the Wasatch Environmental Inc. Page 3 groundwater from within the middle of the screen interval. Once the HS sample was full, the top valve closed for the remainder of the retrieval. Once retrieved, the groundwater was dispensed from the HS sampler into the appropriate sampling containers using the manufacturer’s provided sampling straw and a pair of hemostats which are used to control the flow of sampling to a rate below 100 milliliters per minute. The groundwater samples were dispensed into 40-milliliter capacity glass vials with Teflon® septa caps. The vials, which were supplied by the analytical laboratory, contained several drops of hydrochloric acid as a preservative. The vials were filled slowly until a meniscus formed at the top of each vial, then each vial was sealed with a septa cap. This procedure eliminates headspace within the vials and minimizes the loss of volatiles. The sample vials were each labeled with the analysis required, samplers name, sample identification, sample location, date, and time of sample collection. The samples were placed in a cooler with ice and transported under chain-of-custody protocol to Chemtech-Ford (CTF), a Utah-certified laboratory, for analysis of volatile organic compounds (VOCs) using United States Environmental Protection Agency (U.S. EPA) Method 8260D, total petroleum hydrocarbons gasoline-range organics (TPH-GRO) using U.S. EPA Method 8260B/C, and total petroleum hydrocarbons diesel-range organics (TPH-DRO) using U.S. EPA Method 8015C with silica gel treatment. RESULTS Groundwater analytical results are summarized in Table 1. Analyte concentrations in groundwater were compared to the Utah ISLs and the RBCA Tier 1 Screening Levels. The laboratory analytical report, including chain-of-custody documentation, is presented in Appendix A The laboratory analytical report indicates that there were no analytes detected above laboratory reporting limits in any of the groundwater samples collected. CONCLUSIONS AND RECOMMENDATIONS Wasatch successfully completed the second round of semi-annual groundwater monitoring activities at the Site. Analytical data collected during the February 2024 sampling event were consistent with historical data and did not exhibit any analyte concentrations that exceed applicable Utah ISLs or RBCA Tier 1 Screening Levels. Although this is the final round of groundwater monitoring for this work plan, future groundwater monitoring is recommended to ensure that analytical trends remain consistent and do not increase over time. Our services consist of professional opinions and recommendations made in accordance with generally accepted environmental engineering principles and practices. This warranty is in lieu of all other warranties either expressed or implied. Should you have any questions, please do not hesitate to contact us. Sincerely, WASATCH ENVIRONMENTAL, INC. Jake Scott, P.G. Blake B. Downey, P.G. Geologist Vice President & Senior Project Hydrogeologist Certified UST Consultant: CC0268 Wasatch Environmental Inc. Page 4 Figure Figure 1: Site Vicinity and Monitoring Well location Map Table Table 1: Historical Groundwater Analytical Data Appendix Appendix A: Groundwater Laboratory Analytical Report Figure DATE: November 11, 2022PROJECT NO.: 2077-001MEnvironmental Science and Engineering Scale: 1-inch equals approximately 144 feet Monitoring Well Location 1700 South F o o t h i l l D r i v e Tex a s S t r e e t Site Vicinity and Monitoring Well Location Map American Food Mart 1605 South Foothill Drive Salt Lake City, Utah Approximate Release Site Property Boundary MW-1 MW-3 MW-2 FIGURE 1 LEGEND MW-4MW-5 MW-6 MW-8 MW-9 MW-7 MW-10 Skyline Drive Logan Way Fo o t h i l l C i r c l e Abandoned Monitoring Well Location Table TP H - D R O TP H - G R O Me t h y l t e r t - b u t y l et h e r Be n z e n e Et h y l b e n z e n e Na p h t h a l e n e To l u e n e To t a l X y l e n e s Ni t r a t e ( a s Ni t r o g e n ) Su l f a t e C5 - C 6 A l i p h a t i c Hy d r o c a r b o n s C7 - C 8 A l i p h a t i c Hy d r o c a r b o n s C9 - C 1 0 A l i p h a t i c Hy d r o c a r b o n s C9 - C 1 0 A l k y l Be n z e n e s C1 1 - C 1 2 A l i p h a t i c Hy d r o c a r b o n s C1 1 - C 1 3 A l k y l Na p h t h a l e n e s C1 3 - C 1 6 A l i p h a t i c Hy d r o c a r b o n s C1 7 - C 2 1 A l i p h a t i c Hy d r o c a r b o n s C2 2 - C 3 5 A l i p h a t i c Hy d r o c a r b o n s pH Ox i d a t i o n Re d u c t i o n Po t e n t i a l ( O R P [m v ] ) Di s s o l v e d O x y g e n (D O ) El e c t r i c l a Co n d u c t i v i t y ( E C [m i c r o s i e m e n s / c m ] ) Pr e s e n c e o f Pe t r o F i x MW-1 GW ------12/18/2015 1.11 22.9 <0.00200 5.95 0.638 0.0265 10.7 5.09 ------------------------------------------------ *MW-10 GW ------12/18/2015 1.29 23.1 <0.00200 5.83 0.612 0.0266 11.0 5.05 ------------------------------------------------ ------1/24/2018 ------<0.020 6.710 0.932 <0.020 5.190 4.840 ------<0.200 0.905 <0.200 0.338 0.422 <0.009 0.237 0.0170 1.380 --------------- 109.88 4634.65 9/4/2019 0.969 18.7 <0.100 5.08 0.892 <0.100 6.45 4.42 ------------------------------------------------ 110.46 4634.07 2/20/2020 2.38 28.1 <0.0200 7.37 1.40 0.0357 10.2 7.52 ------------------------------------------------ 111.25 4633.28 5/5/2020 3.26 23.5 <0.0200 6.14 1.40 0.0350 7.55 6.81 ------------------------------------------------ 111.74 4632.79 8/5/2020 3.06 19.3 <0.100 4.95 0.998 <0.100 6.00 5.20 ------------------------------------------------ 112.95 4631.58 1/6/2021 2.08 26.0 <0.0200 6.75 1.35 0.0374 8.70 7.46 ------------------------------------------------ 114.71 4629.82 1/5/2022 2.91 14.5 <0.00200 4.20 1.13 0.0990 2.53 5.22 <0.0100 2.73 ---------------------------7.09 -162.1 2.73 2,150 --- 82.56 4617.18 9/4/2019 <0.489 <0.0200 <0.00200 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 ------------------------------------------------ 83.16 4616.58 2/20/2020 <0.489 <0.0200 <0.00200 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 ------------------------------------------------ 83.57 4616.17 5/5/2020 <0.492 <0.0200 <0.00200 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 ------------------------------------------------ 84.08 4615.66 8/5/2020 <0.491 <0.0200 <0.00200 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 ------------------------------------------------ 85.01 4614.73 1/6/2021 <0.490 <0.0200 <0.00200 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 ------------------------------------------------ 83.33 4630.66 9/4/2019 0.810 <0.0200 <0.00200 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 ------------------------------------------------ 84.08 4629.91 2/20/2020 <0.496 <0.0200 <0.00200 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 ------------------------------------------------ 84.63 4629.36 5/5/2020 <0.492 <0.0200 <0.00200 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 ------------------------------------------------ 85.12 4628.87 8/5/2020 0.670 <0.0200 <0.00200 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 ------------------------------------------------ 86.06 4627.93 1/6/2021 <0.490 <0.0200 <0.00200 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 ------------------------------------------------ ------8/2/2023 <1.0 <0.125 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 ------------------------------------------------ 83.15 4630.84 2/15/2024 <1.0 <0.125 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 ------------------------------------------------ 112.24 4632.82 7/30/2020 2.07 0.508 <0.00200 0.186 0.00967 <0.00200 0.00578 0.0450 ------------------------------------------------ 113.46 4631.60 1/6/2021 <0.492 0.531 <0.00200 0.197 <0.00200 <0.00200 0.00211 0.0274 ------------------------------------------------ 115.21 4629.85 1/5/2022 <0.500 0.408 <0.00200 0.143 <0.00200 <0.00200 <0.00200 0.00804 0.0512 44.0 ---------------------------6.84 -131.4 2.46 2,250 --- 111.79 4633.27 7/30/2020 1.05 2.13 <0.00200 1.11 0.245 <0.00200 0.00778 0.224 ------------------------------------------------ 113.00 4632.06 1/6/2021 <0.491 2.19 <0.00200 1.20 0.226 <0.00200 0.01360 0.0797 ------------------------------------------------ 114.73 4630.33 1/5/2022 <0.498 0.610 <0.00200 0.112 0.0392 <0.00200 0.00221 0.00391 0.0119 47.0 ---------------------------7.09 -142.4 2.65 1,820 --- 111.65 4633.41 7/30/2020 8.69 14.5 <0.0200 5.87 1.10 0.0850 2.63 3.94 ------------------------------------------------ 112.88 4632.18 1/6/2021 5.71 13.4 <0.00200 6.07 1.02 0.0691 0.733 4.18 ------------------------------------------------ 114.65 4630.41 1/5/2022 7.81 4.91 <0.00200 2.80 0.540 0.0762 0.0380 0.721 <0.0100 7.68 ---------------------------7.09 -167.4 3.61 2,030 --- 114.42 4630.64 2/14/2022 2.8 2.90 <0.00200 2.03 0.229 <0.00200 0.161 0.122 <0.1 30.6 ---------------------------6.96 -192.3 2.16 1,930 Yes 113.97 4631.09 3/14/2022 2.2 2.28 <0.005 1.89 0.228 <0.012 0.071 0.086 <0.1 23.0 ---------------------------7.46 -178.3 6.04 1,860 Yes 91.80 4653.26 3/16/2021 0.534 0.0806 <0.00200 0.0160 0.00555 <0.00200 0.0221 0.0112 ------------------------------------------------ 90.90 4654.16 9/29/2022 <1.0 <0.125 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 0.8 129 ---------------------------7.13 -49.9 2.19 1,392.8 No ------8/2/2023 <1.0 <0.125 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 ------------------------------------------------ 88.45 4629.87 2/15/2024 <1.0 <0.125 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 ------------------------------------------------ 93.00 4624.06 3/16/2021 <0.493 <0.0200 <0.00200 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 ------------------------------------------------ ------8/2/2023 <1.0 <0.125 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 ------------------------------------------------ 89.87 4627.19 2/15/2024 <1.0 <0.125 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 ------------------------------------------------ 97.30 4623.65 3/16/2021 <0.493 <0.0200 <0.00200 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 ------8/2/2023 <1.0 <0.125 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 ------------------------------------------------ 94.86 4626.09 2/15/2024 <1.0 <0.125 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 ------------------------------------------------ Skyline Drive - MW-10 MW-10 140-160 4784.12 146.09 -146.09 3/16/2021 <0.493 <0.0200 <0.00200 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 ------------------------------------------------ 1 1 0.2 0.005 0.7 0.7 1 10 ------------------------------------------------ 10 10 0.2 0.3 4 0.7 3 10 ------------------------------------------------ NOTES: < = Concentration was below the reporting limit. BOLD = Measured concentration exceeds the applicable Utah Initial Screening Level . = Measured concentration exceeds the applicable Utah Risk-Based Corrective Action Tier 1 Screening Level --- = Not established, not applicable, or not analyzed. * = Duplicate sample of MW-1 GW. = Sample collected after the PetroFix injections into the MW-1, MW-4, and MW-5 wells. Abandoned Abandoned Abandoned Anions MW-1 American Food Mart - MW-1 110-130 Texas Street - MW-2 Sample Location Sample I.D. Screen Interval (feet) Sample Collection Date Groundwater Elevation Abandoned all concentrations are expressed in milligrams per liter (mg/L) unless otherwise noted Salt Lake City, Utah 1605 South Foothill Drive American Food Mart Historical Groundwater Analytical Data Table 1 Utah Risk-Based Corrective Action Tier 1 Screening Levels Utah Initial Screening Levels MW-2 4699.74164 - 204 Foothill Circle - MW-3 MW-3 152 - 182 4713.99 American Food Mart - MW-4 American Food Mart - MW-6 American Food Mart - MW-5 87-107 4718.32Logan Way - MW-7 MW-7 Groundwater Parameters MW-4 MW-5 MW-6 106 - 126 4,745.06 4,744.45106 - 126 106 - 126 4,744.41 Depth to Water (feet) Top of Casing Elevation 4744.53 TPH-DRO FractionationTPH-GRO FractionationPetroloeum Hydrocarbons 4717.06 1700 South - MW-9 MW-9 92-112 4720.95 Logan Way - MW-8 MW-8 89-109 Appendix A Groundwater Laboratory Analytical Report The analyses presented on this report were performed in accordance with the National Environmental Laboratory Accreditation Program (NELAP) unless noted in the comments, flags, or case narrative. If the report is to be used for regulatory compliance, it should be presented in its entirety, and not be altered. Client Service Contact: 801.262.7299 Wasatch Environmental Attn: Blake Downey 2410 West California Avenue Salt Lake City, UT 84104 Work Order: 24B1200 Project: American Food Mart 2/26/2024 Approved By: Melissa Connolly, Project Manager 9632 South 500 West Sandy, Utah 84070 Serving the Intermountain West since 1953 801.262.7299 Main 866.792.0093 Fax www.ChemtechFord.com Page 1 of 7 xx Chemtech-Ford Laboratories Serving the Intermountain West Since 1953 Certificate of Analysis 9632 South 500 West Sandy, UT 84070 O:(801) 262-7299 F: (866) 792-0093 www.ChemtechFord.com Wasatch Environmental Blake Downey 2410 West California Avenue Salt Lake City, UT 84104 PO#: Receipt: Date Reported: Project Name: 2077-001M 2/15/24 15:33 @ 3.9 °C 2/26/2024 American Food Mart Sample ID: MW-3 Lab ID: 24B1200-01Matrix: Water Flag(s)Units Analysis Date/Time Date Sampled: 2/15/24 11:30 Preparation Date/Time Sampled By: Anna Fiorini/Rachel Kubina Minimum Reporting Limit MethodResult Diesel Range with silica gel cleanup mg/L 2/21/242/21/241.0 EPA 8015 CNDDiesel Range Organics MBTEXn mg/L 2/20/242/20/240.005 EPA 8260D/5030BNDBenzene mg/L 2/20/242/20/240.012 EPA 8260D/5030BNDEthylbenzene mg/L 2/20/242/20/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE) mg/L 2/20/242/20/240.012 EPA 8260D/5030BNDNaphthalene mg/L 2/20/242/20/240.012 EPA 8260D/5030BNDToluene mg/L 2/20/242/20/240.012 EPA 8260D/5030BNDXylenes, total Gasoline Range mg/L 2/20/242/20/240.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics Project Name: American Food Mart CtF WO#: 24B1200 www.ChemtechFord.com Page 2 of 7Page 2 of 7 xx Chemtech-Ford Laboratories Serving the Intermountain West Since 1953 Certificate of Analysis 9632 South 500 West Sandy, UT 84070 O:(801) 262-7299 F: (866) 792-0093 www.ChemtechFord.com Wasatch Environmental Blake Downey 2410 West California Avenue Salt Lake City, UT 84104 PO#: Receipt: Date Reported: Project Name: 2077-001M 2/15/24 15:33 @ 3.9 °C 2/26/2024 American Food Mart Sample ID: MW-7 Lab ID: 24B1200-02Matrix: Water Flag(s)Units Analysis Date/Time Date Sampled: 2/15/24 11:50 Preparation Date/Time Sampled By: Anna Fiorini/Rachel Kubina Minimum Reporting Limit MethodResult Diesel Range with silica gel cleanup mg/L 2/21/242/21/241.0 EPA 8015 CNDDiesel Range Organics MBTEXn mg/L 2/20/242/20/240.005 EPA 8260D/5030BNDBenzene mg/L 2/20/242/20/240.012 EPA 8260D/5030BNDEthylbenzene mg/L 2/20/242/20/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE) mg/L 2/20/242/20/240.012 EPA 8260D/5030BNDNaphthalene mg/L 2/20/242/20/240.012 EPA 8260D/5030BNDToluene mg/L 2/20/242/20/240.012 EPA 8260D/5030BNDXylenes, total Gasoline Range mg/L 2/20/242/20/240.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics Project Name: American Food Mart CtF WO#: 24B1200 www.ChemtechFord.com Page 3 of 7Page 3 of 7 xx Chemtech-Ford Laboratories Serving the Intermountain West Since 1953 Certificate of Analysis 9632 South 500 West Sandy, UT 84070 O:(801) 262-7299 F: (866) 792-0093 www.ChemtechFord.com Wasatch Environmental Blake Downey 2410 West California Avenue Salt Lake City, UT 84104 PO#: Receipt: Date Reported: Project Name: 2077-001M 2/15/24 15:33 @ 3.9 °C 2/26/2024 American Food Mart Sample ID: MW-8 Lab ID: 24B1200-03Matrix: Water Flag(s)Units Analysis Date/Time Date Sampled: 2/15/24 12:05 Preparation Date/Time Sampled By: Anna Fiorini/Rachel Kubina Minimum Reporting Limit MethodResult Diesel Range with silica gel cleanup mg/L 2/21/242/21/241.0 EPA 8015 CNDDiesel Range Organics MBTEXn mg/L 2/20/242/20/240.005 EPA 8260D/5030BNDBenzene mg/L 2/20/242/20/240.012 EPA 8260D/5030BNDEthylbenzene mg/L 2/20/242/20/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE) mg/L 2/20/242/20/240.012 EPA 8260D/5030BNDNaphthalene mg/L 2/20/242/20/240.012 EPA 8260D/5030BNDToluene mg/L 2/20/242/20/240.012 EPA 8260D/5030BNDXylenes, total Gasoline Range mg/L 2/20/242/20/240.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics Project Name: American Food Mart CtF WO#: 24B1200 www.ChemtechFord.com Page 4 of 7Page 4 of 7 xx Chemtech-Ford Laboratories Serving the Intermountain West Since 1953 Certificate of Analysis 9632 South 500 West Sandy, UT 84070 O:(801) 262-7299 F: (866) 792-0093 www.ChemtechFord.com Wasatch Environmental Blake Downey 2410 West California Avenue Salt Lake City, UT 84104 PO#: Receipt: Date Reported: Project Name: 2077-001M 2/15/24 15:33 @ 3.9 °C 2/26/2024 American Food Mart Sample ID: MW-9 Lab ID: 24B1200-04Matrix: Water Flag(s)Units Analysis Date/Time Date Sampled: 2/15/24 12:20 Preparation Date/Time Sampled By: Anna Fiorini/Rachel Kubina Minimum Reporting Limit MethodResult Diesel Range with silica gel cleanup mg/L 2/21/242/21/241.0 EPA 8015 CNDDiesel Range Organics MBTEXn mg/L 2/20/242/20/240.005 EPA 8260D/5030BNDBenzene mg/L 2/20/242/20/240.012 EPA 8260D/5030BNDEthylbenzene mg/L 2/20/242/20/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE) mg/L 2/20/242/20/240.012 EPA 8260D/5030BNDNaphthalene mg/L 2/20/242/20/240.012 EPA 8260D/5030BNDToluene mg/L 2/20/242/20/240.012 EPA 8260D/5030BNDXylenes, total Gasoline Range mg/L 2/20/242/20/240.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics Project Name: American Food Mart CtF WO#: 24B1200 www.ChemtechFord.com Page 5 of 7Page 5 of 7 xx Chemtech-Ford Laboratories Serving the Intermountain West Since 1953 Certificate of Analysis 9632 South 500 West Sandy, UT 84070 O:(801) 262-7299 F: (866) 792-0093 www.ChemtechFord.com Wasatch Environmental Blake Downey 2410 West California Avenue Salt Lake City, UT 84104 PO#: Receipt: Date Reported: Project Name: 2077-001M 2/15/24 15:33 @ 3.9 °C 2/26/2024 American Food Mart Report Footnotes Abbreviations ND = Not detected at the corresponding Minimum Reporting Limit (MRL). 1 mg/L = one milligram per liter or 1 mg/kg = one milligram per kilogram = 1 part per million. 1 ug/L = one microgram per liter or 1 ug/kg = one microgram per kilogram = 1 part per billion. 1 ng/L = one nanogram per liter or 1 ng/kg = one nanogram per kilogram = 1 part per trillion. On calculated parameters, there may be a slight difference between summing the rounded values shown on the report vs the unrounded values used in the calculation. Project Name: American Food Mart CtF WO#: 24B1200 www.ChemtechFord.com Page 6 of 7Page 6 of 7 Page 7 of 7