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HomeMy WebLinkAboutDERR-2024-007076 Stantec Consulting Services Inc. 2890 East Cottonwood Parkway Suite 300 Salt Lake City UT 84121-7283 May 10, 2024 Project/File: 203720675 Nicole Chavez Utah Department of Environmental Quality Division of Environmental Response and Remediation 195 North 1950 West, First Floor Salt Lake City, Utah 84116 Reference: Quarterly Groundwater Monitoring Report – 7-Eleven Store No. 35508 712 South State Street, Clearfield, Utah Facility ID 3000334, Release Site NGN Dear Ms. Chavez, On behalf of 7-Eleven, Inc. (7-Eleven), Stantec Consulting Services Inc. (Stantec) presents the March 20, 2024 quarterly groundwater monitoring and sampling results for 7-Eleven Store No. 35508 (the Site). The Site is located at 712 South State Street, Clearfield, Utah (Figure 1). The Utah Department of Environmental Quality (UDEQ) Division of Environmental Response and Remediation (DERR) refers to the Site as Facility ID 3000334 and Release Site NGN. The March 2024 event is the last of three quarterly groundwater monitoring and sampling events authorized under Work Plan and Budget (WP&B) NGN-14 which was approved by the DERR in a letter dated September 28, 2023. BACKGROUND 7-Eleven currently operates the Site as a convenience store with retail sale of gasoline and diesel fuels. The UST and distribution system consists of three 10,000-gallon, single wall, fiberglass-reinforced plastic USTs used to store unleaded gasoline and diesel product, associated product piping, and four product dispenser islands. The UST system was installed in 1989. A suspected release of petroleum from the UST system was reported for the Site on May 14, 2015. The suspected release was based on a failed tank tightness test associated with the center 10,000-gallon unleaded gasoline tank. After tank repairs were completed, the repaired tank passed a follow-up tank tightness test on May 27, 2015. On and off-site investigation and remediation efforts conducted since the discovery of the release are summarized below.  The initial subsurface investigation was conducted in August 2015.  Additional subsurface investigation was conducted in December 2015. May 10, 2024 Page 2 of 6 Reference: Quarterly Groundwater Monitoring Report – 7-Eleven Store No. 35508 712 South State Street, Clearfield, Utah Facility ID 3000334, Release Site NGN  In October of 2016, two-inch monitoring wells MW-1R through MW-7R and MW-8 were installed. The original one-inch monitoring wells were abandoned except for MW-2 as it periodically contained light non-aqueous phased liquid (LNAPL).  A 30-day high-vacuum dual-phase extraction (HVDPE) pilot study event was conducted from September 11 through October 11, 2017.  In November 2017, off-site monitoring well MW-9 was installed on the adjacent car dealership property to the south.  Sub-slab vapor sampling was conducted beneath the store building in 2018.  In August of 2019, monitoring wells MW-10 and MW-11 were installed off-site on the adjacent autobody property to the west, and well MW-12 was installed on-site.  Semiannual to quarterly groundwater monitoring events were conducted between 2016 and 2021.  Monthly LNAPL monitoring and periodic LNAPL recovery events were conducted between 2019 and 2022.  In March 2021, significant LNAPL was observed in well MW-2R and prompted LNAPL sampling for product identification analysis. The LNAPL was originally identified by Chemtech-Ford Analytical Laboratories (CF) of Sandy, Utah as jet fuel JP-4 in June 2021. LNAPL sampling and product identification analysis was repeated in January 2023. Apex Laboratories, LLC (Apex) of Tigard, Oregon subsequently identified the LNAPL as degraded gasoline. Upon reviewing the original product identification results obtained by CF, Apex concluded those results were similar to their own January 2023 results and suspected that the evaluation performed by CF was possibly flawed. GROUNDWATER MONITORING AND SAMPLING The March 20, 2024 groundwater monitoring and sampling was conducted by a DERR Certified Soil and Groundwater Sampler and in accordance with the protocols established in the Utah Underground Storage Tank Rules, R311-205. Twelve of the thirteen site monitoring wells were included in the March 20, 2024 monitoring and sampling event. Monitoring well MW-2 is not sampled as it is only used for gauging/LNAPL monitoring. During the March 20, 2024 event, the MW-2 casing appeared to be blocked with sediment, and the well could not be gauged. MW-2R was not sampled as it contained LNAPL with an apparent thickness of 0.04 feet. Prior to purging and sampling, the static groundwater levels and/or LNAPL thicknesses were gauged in each well to the nearest one hundredth of a foot using a battery-powered product/water interface probe. Wells were then purged via weighted, plastic, disposable bailer until three well volumes were removed. The wells were then allowed to recharge to at least 80 percent of the original water column prior to sampling. Groundwater samples were collected via bailer and decanted into amber glass volatile organic analysis (VOA) containers with hydrochloric acid (HCl) preservative. Samples for analysis of total petroleum hydrocarbons-gasoline range organics (TPH-GRO), methyl tert-butyl ether, benzene, toluene, ethylbenzene, total xylenes, and naphthalene (MBTEXN) by EPA Method 8260B were collected in three 40-millileter (mL) VOAs containing hydrochloric acid (HCl) preservative. Samples for analysis of total petroleum hydrocarbons diesel range organics (TPH-DRO) by EPA Method 8015 were collected in two 40-mL VOAs containing HCl preservative. . Samples were then labeled with the sample identification, collection date, and time, and placed into an ice chilled cooler and transferred to the laboratory courier for delivery under chain-of-custody (COC) documentation to Utah certified Pace Analytical National (Pace) of Mount Juliet, Tennessee. Stantec also collected a blind duplicate sample from MW-5R; the duplicate was May 10, 2024 Page 3 of 6 Reference: Quarterly Groundwater Monitoring Report – 7-Eleven Store No. 35508 712 South State Street, Clearfield, Utah Facility ID 3000334, Release Site NGN analyzed for MBTEXN, TPH-GRO, and TPH-DRO. Pace prepared a trip blank sample that accompanied the sample bottles during shipment and collection; the trip black was analyzed for MBTEXN and TPH-GRO. RESULTS Figure 1 illustrates the March 20, 2024 groundwater elevations across the Site. Respectively, Figure 2 and Figure 3 illustrate the March 20, 2024 isoconcentration for dissolved benzene and TPH-GRO concentrations. Table 2 summarizes historical and current groundwater analytical results and groundwater elevation data. Graph 1 shows LNAPL thicknesses and groundwater elevation data for MW-2R. Respectively, Graph 2 and Graph 3 show dissolved concentrations of benzene and TPH GRO, including depth to groundwater data, in MW-5R. Respectively, Graph 4 and Graph 5 show dissolved concentrations of benzene and TPH GRO in MW-8. Respectively, Graph 6 and Graph 7 show dissolved concentrations of benzene and TPH GRO in MW-9. Copies of the laboratory analytical report and the chain of custody documentation are provided in Attachment A. Field and analytical results for the March 20, 2024 groundwater monitoring event are summarized below. Analytical results are compared to the Initial Screenings Levels (ISLs) and Tier 1 Screening Levels (TSLs) established by the UDEQ DERR Petroleum Storage Tank (PST) Branch.  The LNAPL thicknesses in MW-2R were less than one hundredth of a foot. The product/water interface probe produced a solid LNAPL tone, but it persisted for less than one hundredth of a foot. This was interpreted in the field as an LNAPL sheen.  In wells not containing LNAPL, shallow groundwater was measured at a depth ranging from 10.19 (MW-5R) to 12.54 (MW-9) feet (ft) below top of casing. A southwest hydraulic gradient of approximately 0.027 ft per foot was measured between wells MW-1R and MW-11.  The dissolved ethylbenzene and TPH-DRO concentrations in the groundwater sample collected from MW-5R exceeded the respective ISLs, the laboratory reporting limit (RL) for benzene exceeded the ISL, and the dissolved toluene, total xylenes, and TPH-GRO concentrations exceed the respective TSLs.  The dissolved benzene and TPH-GRO concentrations in the groundwater sample collected from MW-9 exceeded the respective ISLs.  The relative percent differences (RPDs) calculated between the parent and duplicate samples collected from MW-5R were outside the generally accepted standards with the exception of TPH-DRO. The duplicate result was significantly lower than the parent sample with RPDs ranging from 22 to 87 percent. The parent sample and duplicate sample were analyzed in separate batches for VOC analysis. RPDs could not be calculated for MTBE, benzene, and naphthalene; these compounds were below the RL in either the parent and duplicate or both.  No dissolved petroleum hydrocarbons were detected at concentrations above the RLs in the trip blank.  All other concentrations were either below ISLs or were not reported above the RLs. May 10, 2024 Page 4 of 6 Reference: Quarterly Groundwater Monitoring Report – 7-Eleven Store No. 35508 712 South State Street, Clearfield, Utah Facility ID 3000334, Release Site NGN CONCLUSIONS Based on the field and analytical data summarized above, and comparison of the results of this event with the historical data, Stantec presents the following conclusions.  March 2024 relative groundwater elevations were higher in Site monitoring wells when compared to December 2023 relative groundwater elevations, increasing by at least one foot in most wells. o The southwest groundwater flow direction remains relatively consistent with previous groundwater monitoring events.  The March 2024, with shallower water depths, LNAPL thickness in MW-2R (0.04 feet apparent thickness) decreased significantly when compared to the September 2023 event (1.10 feet apparent thickness. LNAPL was not detected in MW-2R in December 2023.  Some dissolved petroleum hydrocarbon concentrations in MW-5R and MW-9 decreased while others increased between the December 2023 and March 2024 monitoring events.  In MW-5R, dissolved benzene, ethylbenzene, and TPH-DRO concentrations remain above ISLs and toluene, total xylenes, and TPH-GRO concentrations remain above TSLs.  In MW-9, dissolved benzene and TPH-GRO concentrations remain above ISLs.  In MW-8, dissolved benzene and TPH-GRO concentrations remain below ISLs.  In mw-11, the dissolved benzene concentration remains below the RL.  It appears that, in general, dissolved petroleum hydrocarbon concentrations in source area wells (such as MW-5R) tend to increase with increased groundwater elevations at the Site. This suggests groundwater is interacting with more of the smear zone (more LNAPL becomes submerged) in these instances. Concentrations in downgradient wells tend to decrease with increased groundwater elevations at the Site, possibly due to more dilution by the increased volume of groundwater in the formation. RECOMMENDATIONS Given the current high water table conditions and relative stability of the dissolved plume, Stantec does not recommend active remediation of petroleum hydrocarbon impacts at this time. Based on the historical database, the majority of petroleum hydrocarbons in the subsurface are likely submerged during high water table conditions and therefore inaccessible for vapor phase recovery. Alternatively dissolved phase recovery would likely result in more significant costs associated with groundwater extraction, treatment, and discharge to the public sanitary sewer. This is based on the fact that approximately 5,000 gallons of groundwater were extracted, treated, and discharged per day during the 2017 30-day mobile dual phase extraction event. Since the dissolved plume has remained relatively stable, Stantec recommends postponing active remediation until low water table conditions return. Site specific low water table conditions should be defined by the depth to water in MW-2R becoming greater than 13 ft below ground surface. Under these conditions, Stantec has observed the greatest LNAPL thickness in MW-2R as well as lower dissolved phase concentrations across the Site. Both of which indicate the majority of petroleum hydrocarbons are likely unsubmerged (and accessible for vapor phase recovery) during those times. Based on the historical database, low water table conditions would likely provide significant recovery of subsurface petroleum hydrocarbons via a dual phase recovery remediation system (either mobile or fixed). May 10, 2024 Page 5 of 6 Reference: Quarterly Groundwater Monitoring Report – 7-Eleven Store No. 35508 712 South State Street, Clearfield, Utah Facility ID 3000334, Release Site NGN Stantec recommends semiannual groundwater monitoring until low water table conditions are observed. The semiannual events should be conducted during previously observed high and low water table seasonal variations, typically late spring to early summer and winter. Stantec also recommends passive LNAPL recovery from MW-2R via sorbent socks with monthly checks to reposition the sock according to depth to water conditions and replace as necessary. It is recommended that the sorbent sock be removed one month prior to semiannual groundwater monitoring events in order to check for LNAPL thickness recovery. LNAPL would be recovered from MW-2R via bailer during semiannual groundwater monitoring events. LIMITATIONS AND CERTIFICATION The conclusions in the Report titled Quarterly Groundwater Monitoring Report – 7-Eleven Store No. 35508 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, Inc. (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. All information, conclusions, and recommendations provided by Stantec in this document regarding the Site have been prepared under the supervision of, and reviewed by, the certified UST consultant whose signature appears below. May 10, 2024 Page 6 of 6 Reference: Quarterly Groundwater Monitoring Report – 7-Eleven Store No. 35508 712 South State Street, Clearfield, Utah Facility ID 3000334, Release Site NGN If you have any questions or require any additional information, please contact Anna Skinner via the contact information provided below. Sincerely, STANTEC CONSULTING SERVICES INC. Anna Skinner Project Manager Phone: (801) 743-4815 anna.skinner@stantec.com Attachments: Figure 1 – Groundwater Contour Map, March 20, 2024 Figure 2 – Dissolved Benzene Isoconcentration Map, March 20, 2024 Figure 3 – Dissolved TPH-GRO Isoconcentration Map, March 20, 2024 Table 1 – LNAPL Monitoring Results Table 2 – Groundwater Monitoring and Analytical Results Graph 1 – MW-2R LNAPL Thickness vs Time Graph 2 – MW-5R Benzene Concentration vs. Time Graph 3 – MW-5R TPH-GRO Concentration vs. Time Graph 4 – MW-8 Benzene Concentration vs. Time Graph 5 – MW-8 TPH-GRO Concentration vs. Time Graph 6 – MW-9 Benzene Concentration vs. Time Graph 7 – MW-9 TPH-GRO Concentration vs. Time Attachment A – Laboratory Analytical Report and Chain-of-Custody Documentation Reference: Quarterly Groundwater Monitoring Report – 7-Eleven Store No. 35508 712 South State Street, Clearfield, Utah Facility ID 3000334, Release Site NGN FIGURES T T T T T T T T T XXXXXXXXXXXXXXXXX X X X X X X X X X X X X X X XXXXXX X X X X X X X X X X X X X X X X X X X X X X X X X 7-ELEVEN STORE NO. 35508 G G G G G G G G G G G G G G T T T T T T T T T T T T T T T T G G G G G G G G G G E E E E E E E E E E E E E E E E E E E E E E E E STORE E E E E MW-8 (84.70) MW-2 MW-4R (86.91) MW-3R (87.72) MW-5R (86.78) MW-1R (88.61) MW-2R (87.33*) MW-6R (85.82) 7 0 0 S O U T H S T R E E T UTAH TITLE LOANS S T A T E S T R E E T PEDESTAL SIGN WATER METER CANOPY DISPENSERS UST BASIN PRODUCT PIPING LIGHT POLE TRANSFORMERTRASH ENCLOSURE TRANSFORMER MW-7R (84.62) TRANSFORMER SSVMP-1 MW-9 (82.52) MW-10 (82.96) AB R A A U T O B O D Y S H O P MW-11 (82.53) MW-12 (87.18) 203720675 STA/CRJ AMS JPW 05/07/2024 1GROUNDWATER CONTOUR MAP MARCH 20, 2024STORE #35508 712 SOUTH STATE STREET CLEARFIELD, UTAH FOR: JOB NUMBER:DRAWN BY:CHECKED BY:APPROVED BY:DATE: FILEPATH:V:\2037\Active\203720675\05_report_deliv\drawings_design\cad_fig\FIG 1_7-11_35508_GW CONTOUR MAP.dwg | Layout Tab: 1 | Drafter: CJAMES | May 07, 2024 at 17:51 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 0 40 80 APPROXIMATE SCALE IN FEET ELEVEN WESTBRIDGE AUTO LEGEND APPROXIMATE PROPERTY BOUNDARY FENCE LINE GAS LINE TELEPHONE LINE ELECTRIC LINE X X X X X G G T T E E MONITORING WELL LOCATIONMW-1 (87.18) 85 RELATIVE GROUNDWATER ELEVATION (FEET) INFERRED GROUNDWATER FLOW DIRECTION WELL NOT GAUGED STORM DRAINSDSD *CORRECTED RELATIVE GROUNDWATER ELEVATION SSVMP-1 SUB-SLAB VAPOR MONITORING POINT RELATIVE GROUNDWATER ELEVATION CONTOUR (FEET) DASHED WHERE INFERRED PHONE: 2890 E COTTONWOOD PKWY, STE 300 SALT LAKE CITY, UTAH (801) 261-0090 83 83 84 8 4 8 5 85 8 6 8 6 8 7 8 7 88 8 8 F F T T T T T T T T T XXXXXXXXXXXXXXXXX X X X X X X X X X X X X X X XXXXXX X X X X X X X X X X X X X X X X X X X X X X X X X 7-ELEVEN STORE NO. 35508 G G G G G G G G G G G G G G T T T T T T T T T T T T T T T T G G G G G G G G G G E E E E E E E E E E E E E E E E E E E E E E E E STORE E E E E MW-8 <1.0 MW-2 MW-4R <1.0 MW-3R <1.0 MW-5R<47.1 MW-1R <1.0 MW-6R <1.0 7 0 0 S O U T H S T R E E T UTAH TITLE LOANS S T A T E S T R E E T PEDESTAL SIGN WATER METER CANOPY DISPENSERS UST BASIN PRODUCT PIPING LIGHT POLE TRANSFORMERTRASH ENCLOSURE TRANSFORMER MW-7R <1.0 TRANSFORMER MW-9 17.7 MW-10 <1.0 MW-11 <1.0 SSVMP-1 AB R A A U T O B O D Y S H O P MW-2R LNAPL MW-12 <1.0 203720675 STA/CRJ AMS JPW 2 DISSOLVED BENZENE ISOCONCENTRATION MAP MARCH 20, 2024STORE #35508 712 SOUTH STATE STREET CLEARFIELD, UTAH FOR: JOB NUMBER:DRAWN BY:CHECKED BY:APPROVED BY:DATE: FILEPATH:V:\2037\Active\203720675\05_report_deliv\drawings_design\cad_fig\FIG 2_7-11_35508_DIS BENZ MAP.dwg | Layout Tab: 2 | Drafter: CJAMES | May 07, 2024 at 17:49 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 0 40 80 APPROXIMATE SCALE IN FEET ELEVEN LEGEND APPROXIMATE PROPERTY BOUNDARY FENCE LINE GAS LINE TELEPHONE LINE ELECTRIC LINE X X X X X G G T T E E MONITORING WELL LOCATIONMW-1 STORM DRAINSDSD SSVMP-1 SUB-SLAB VAPOR MONITORING POINT 5 DISSOLVED BENZENE CONCENTRATION MICROGRAMS PER LITER (µg/L) LIGHT NON-AQUEOUS PHASE LIQUIDLNAPL <1.0 05/07/2024 WESTBRIDGE AUTO BENZENE ISOCONCENTRATION CONTOUR (µg/L) PHONE: 2890 E COTTONWOOD PKWY, STE 300 SALT LAKE CITY, UTAH (801) 261-0090 5 NAPL F WELL NOT SAMPLED F T T T T T T T T T XXXXXXXXXXXXXXXXX X X X X X X X X X X X X X X XXXXXX X X X X X X X X X X X X X X X X X X X X X X X X X 7-ELEVEN STORE NO. 35508 G G G G G G G G G G G G G G T T T T T T T T T T T T T T T T G G G G G G G G G G E E E E E E E E E E E E E E E E E E E E E E E E STORE E E E E MW-8 <500 MW-4R <500 MW-3R <500 MW-5R 183,000 MW-6R <500 AB R A A U T O B O D Y S H O P 7 0 0 S O U T H S T R E E T UTAH TITLE LOANS S T A T E S T R E E T PEDESTAL SIGN WATER METER CANOPY DISPENSERS UST BASIN PRODUCT PIPING LIGHT POLE TRANSFORMERTRASH ENCLOSURE TRANSFORMER MW-7R <500 TRANSFORMER MW-9 2,500 MW-10 <500 MW-12 <500 MW-11 <500 SSVMP-1 MW-1R <500 MW-2 MW-2R LNAPL 203720675 STA/CRJ AMS JPW 3 DISSOLVED TPH-GRO ISOCONCENTRATION MAP MARCH 20, 2024STORE #35508 712 SOUTH STATE STREET CLEARFIELD, UTAH FOR: JOB NUMBER:DRAWN BY:CHECKED BY:APPROVED BY:DATE: FILEPATH:V:\2037\Active\203720675\05_report_deliv\drawings_design\cad_fig\FIG 3_7-11_35508_TPH-GRO MAP.dwg | Layout Tab: 3 | Drafter: CJAMES | May 07, 2024 at 17:50 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 0 40 80 APPROXIMATE SCALE IN FEET ELEVEN LEGEND APPROXIMATE PROPERTY BOUNDARY FENCE LINE GAS LINE TELEPHONE LINE ELECTRIC LINE X X X X X G G T T E E MONITORING WELL LOCATIONMW-1 STORM DRAINSDSD SSVMP-1 1,000 LIGHT NON-AQUEOUS PHASE LIQUIDLNAPL 2,500 SUB-SLAB VAPOR MONITORING POINT DISSOLVED TPH-GRO CONCENTRATION MICROGRAMS PER LITER (µg/L) TPH-GRO ISOCONCENTRATION CONTOUR (µg/L) TOTAL PETROLEUM HYDROCARBONS GASOLINE RANGE ORGANICS TPH-GRO 05/07/2024 WESTBRIDGE AUTO PHONE: 2890 E COTTONWOOD PKWY, STE 300 SALT LAKE CITY, UTAH (801) 261-0090 LNA P L 10,000 10,000 1,000 1,00 0 F WELL NOT SAMPLEDF Reference: Quarterly Groundwater Monitoring Report – 7-Eleven Store No. 35508 712 South State Street, Clearfield, Utah Facility ID 3000334, Release Site NGN TABLES 08/04/15 --11.01 --11/01/16 11.37 11.45 0.08 12/10/15 --13.00 --12/13/16 11.64 11.70 0.06 05/25/16 10.47 12.58 2.11 03/03/17 9.74 10.03 0.29 08/04/16 10.73 10.82 0.09 05/01/17 9.64 9.89 0.25 11/01/16 11.22 12.45 1.23 06/15/17 9.69 9.93 0.24 12/13/16 11.43 12.04 0.61 11/14/17 --11.01 -- 05/01/17 9.82 9.88 0.06 03/21/18 11.95 14.14 2.19 09/25/19 10.57 11.43 0.86 06/28/18 11.08 12.53 1.45 12/17/19 11.31 11.52 0.21 12/19/18 12.10 13.50 1.40 01/24/20 --11.85 --08/22/19 9.33 9.53 0.20 03/03/20 --11.55 --09/25/19 10.57 10.80 0.23 04/02/20 --11.61 --09/27/19 10.59 10.84 0.25 06/22/20 11.30 11.43 0.13 11/01/19 11.26 11.40 0.14 07/23/20 11.26 11.31 0.05 11/21/19 11.71 11.78 0.07 08/14/20 --11.41 --12/17/19 11.19 11.20 0.01 09/16/20 11.31 11.39 0.08 01/24/20 --11.66 -- 11/13/20 11.92 11.95 0.03 03/03/20 --11.40 -- 12/21/20 --12.66 --04/02/20 --11.52 -- 01/29/21 13.24 13.25 0.01 06/22/20 --11.18 -- 03/24/21 12.47 13.41 0.94 07/23/20 --11.04 -- 04/27/21 12.95 12.97 0.02 08/14/20 --11.22 -- 05/14/21 12.76 12.80 0.04 09/16/20 11.17 11.19 0.02 06/22/21 12.50 12.62 0.12 11/13/20 --12.20 -- 12/07/21 13.00 13.10 0.10 12/21/20 --12.50 -- 02/09/22 --13.12 --01/29/21 --13.00 -- 03/31/22 --13.04 --03/24/21 12.30 13.65 1.35 05/07/22 13.21 13.76 0.55 04/21/21 12.65 13.89 1.24 06/03/22 12.80 13.70 0.90 04/27/21 12.78 12.85 0.07 06/22/22 12.60 13.60 1.00 05/14/21 12.60 12.71 0.11 07/08/22 12.80 12.90 0.10 06/03/21 12.50 12.70 0.20 08/09/22 12.95 13.20 0.25 06/22/21 12.39 12.52 0.13 01/12/23 12.83 13.60 0.77 07/14/21 12.50 12.79 0.29 03/24/23 12.00 12.06 0.06 08/11/21 12.29 12.35 0.06 09/27/23 11.46 12.55 1.09 09/14/21 12.18 12.20 0.02 12/18/23 --12.10 --12/07/21 12.72 13.35 0.63 03/20/24 ------02/09/22 12.78 13.90 1.12 11/01/16 --10.80 --03/31/22 --12.98 -- 12/13/16 --11.07 --05/07/22 12.84 14.43 1.59 03/03/17 9.17 9.18 0.01 06/03/22 12.60 13.75 1.15 05/01/17 9.05 9.26 0.21 06/22/22 12.44 13.44 1.00 06/15/17 9.29 9.34 0.05 07/08/22 12.70 12.82 0.12 11/14/17 --10.53 --08/09/22 12.79 13.24 0.45 03/21/18 --11.79 --01/12/23 12.70 13.50 0.80 06/28/18 --11.81 --03/24/23 11.92 12.97 1.05 12/19/18 --11.78 --09/27/23 11.36 12.46 1.10 09/25/19 --10.12 --12/18/23 --12.00 -- 12/17/19 --10.57 --03/20/24 10.81 10.85 0.04 04/02/20 --10.86 -- 06/22/20 --10.54 -- 08/14/20 --10.75 -- 09/16/20 --10.62 -- 11/13/20 --11.33 -- 12/21/20 --11.90 --08/04/16 MW-2 6 01/29/21 --12.38 -- 03/24/21 --11.97 -- 06/22/21 --11.80 --05/01/17 MW-2R, MW-5R 4.0 09/14/21 --11.56 --09/11/17 MW-2R, MW-5R 30 (days) 02/09/22 --12.42 --08/22/19 MW-2R 6.0 03/31/22 --11.95 --09/27/19 MW-2R 4.0 05/07/22 --12.15 --11/01/19 MW-2R 4.0 06/03/22 --12.40 --11/21/19 MW-2R 5.0 06/22/22 --12.00 --04/21/21 MW-2R 4.0 07/08/22 --12.04 --07/14/21 MW-2R 5.0 08/09/22 --12.15 --06/22/22 MW-2R 6.0 01/12/23 --12.21 -- 03/24/23 --11.41 -- 09/27/23 --10.78 -- 12/18/23 --11.41 -- 03/20/24 --10.19 -- MW-2R MW-5R Extraction Wells Duration (hours) MW-2R, MW-3R, MW-5R 4.512/13/16 LNAPL Recovery Events Date MW-2 712 South State Street, Clearfield, Utah 7-Eleven Store No. 35508 LNAPL Monitoring Results TABLE 1 Sample Location Date Depth to LNAPL (feet) Depth to Groundwater (feet) LNAPL Thickness (feet) Sample Location Date Depth to LNAPL (feet) Depth to Groundwater (feet) LNAPL Thickness (feet) dft_dbs_35508_2024320.xlsx lnapl 1 of 1 Stantec Consulting Services Inc. . MTBE Benzene Toluene Ethyl- benzene Total Xylenes Naphthalene 08/04/15 -- 11.53 -- <1.00 179 156 6.10 106 <5.00 1,600 96.7 88.47 12/10/15 -- 12.75 -- <1.00 274 1,660 151 1,090 <5.00 7,070 <100 87.25 05/25/16 -- 11.72 -- <1.00 32.8 24.4 2.34 39.7 <5.00 746 <89.3 88.28 11/01/16 -- 11.92 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <92.6 88.08 03/03/17 -- 10.41 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <92.6 89.59 06/15/17 -- 10.06 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <96.2 89.94 11/14/17 -- 11.35 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <89.3 88.65 03/20/18 -- 13.09 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 139 86.91 06/28/18 -- 11.85 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 132 88.15 12/19/18 -- 13.03 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <91.6 86.97 09/25/19 -- 11.02 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <49.3 88.98 12/17/19 -- 11.79 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <99.8 88.21 04/02/20 -- 12.13 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <47.3 87.87 06/22/20 -- 11.70 --<2.004 <1.004 <1.004 <1.004 <1.004 <1.004 <50.04 <47.4 88.30 12/21/20 --13.10 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.9 86.90 03/24/21 --13.21 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.6 86.79 06/23/21 --13.02 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.7 86.98 09/14/21 --12.88 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.7 87.12 01/12/23 --13.69 --<5 <5 <12 <12 <12 <12 <125 <1,000 86.31 09/27/23 --11.84 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 <100 88.16 12/18/23 --12.60 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 <100 87.40 03/20/24 --11.39 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 134 88.61 08/04/15 --11.01 -- <1.00 4,180 6,720 374 2,760 7.51 11,100 378 88.13 12/10/15 --13.00 -- <50.0 17,100 78,600 3,940 35,900 <250 245,000 6,330 86.14 05/25/16 10.47 12.58 2.11 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 87.32c 11/01/16 11.22 12.45 1.23 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 86.79c 09/25/19 10.57 11.43 0.86 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 87.54c 12/17/19 11.31 11.52 0.21 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 86.96c 04/02/20 --11.61 --86.71 06/22/20 11.30 11.43 0.13 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 86.99c 12/21/20 --12.66 --85.66 03/24/21 12.47 13.41 0.94 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 85.62c 06/22/21 12.50 12.62 0.12 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 85.79c 01/12/23 12.83 13.60 0.77 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 85.30c 09/27/23 11.46 12.55 1.09 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 86.59c 12/18/23 --12.10 -- LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 86.22 03/20/24 -------- 11/01/16 11.37 11.45 0.08 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 86.76c 03/03/17 9.74 10.03 0.29 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 88.34c 06/15/17 9.69 9.93 0.24 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 88.40c 11/14/17 --11.01 -- <100 2,350 24,000 1,820 14,100 <500 128,000 3,850 87.14 03/21/18 11.95 14.14 2.19 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 85.65c 06/28/18 11.08 12.53 1.45 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 86.71c 12/19/18 12.10 13.50 1.40 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 85.70c 09/25/19 10.57 10.80 0.23 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 87.52c 12/17/19 11.19 11.20 0.01 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 86.96c 04/02/20 --11.52 -- <200 <100 1,530 608 5,030 <100 16,700 14,200 86.63 06/22/20 --11.18 --<2,000 <1,000 1,050 <1,000 2,540 <1,000 <50,000 7,090 86.97 12/21/20 --12.50 -- <100 <100 717 765 7,290 <200 31,800 9,620 85.65 03/24/21 12.30 13.65 1.35 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 85.51c 06/22/21 12.39 12.52 0.13 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 85.73c 09/14/21 12.18 12.20 0.02 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 85.97c 01/12/23 12.70 13.50 0.80 <5 41 34,100 25,800 254,000 259 343,000 68,100 85.25c 09/27/23 11.36 12.46 1.10 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 86.52c 12/18/23 --12.00 -- LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 86.15 03/20/24 10.81 10.85 0.04 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 87.33c 08/04/15 --11.49 -- <1.00 4,250 15,400 925 8,150 32.2 65,800 1,250 87.45 12/10/15 --12.80 -- <20.0 405 157 63.4 331 <100 <8,000 130 86.14 05/25/16 --11.48 -- <20.0 1,470 16,200 1,460 9,420 <100 71,200 1,850 87.46 11/01/16 --11.78 -- <1.00 22.1 235 166 914 12.8 4,460 407 87.16 03/03/17 --10.17 -- <1.00 18.5 1,770 283 6,220 81.4 18,100 5,220 88.77 06/15/17 --9.91 -- <1.00 <1.00 7.86 24.5 238 23.6 4,600 1,680 89.03 11/14/17 --11.19 -- <1.00 <1.00 <1.00 7.74 34.2 <5.00 <400 449 87.75 03/20/18 --12.79 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <86.2 86.15 06/28/18 --11.74 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <94.6 87.20 12/19/18 --12.82 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <91.7 86.12 09/25/19 --10.96 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <47.9 87.98 12/17/19 --11.54 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <95.8 87.40 04/02/20 --11.88 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <47.4 87.06 06/22/20 --11.42 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <47.5 87.52 12/21/20 --12.86 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.8 86.08 03/24/21 --12.99 -- <0.500 1.88 <0.500 <0.500 <0.500 <1.00 <50.0 <47.6 85.95 06/23/21 --12.79 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.6 86.15 09/14/21 --12.55 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.7 86.39 01/12/23 --13.28 --<5 <5 <12 <12 <12 <12 <125 <1,000 85.66 09/27/23 --11.75 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 <100 87.19 12/18/23 --12.42 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 <200 86.52 03/20/24 --11.22 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 140 87.72 08/04/15 --11.33 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 107 86.87 12/10/15 --12.53 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <100 85.67 05/25/16 --11.28 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 493 <96.2 86.92 11/01/16 --11.74 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <92.6 86.46 03/03/17 --10.26 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 676 87.94 06/15/17 --10.26 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 123 87.94 11/14/17 --11.50 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 448 155 86.70 03/21/18 --12.66 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <92.6 85.54 06/28/18 --11.81 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <94.4 86.39 12/19/18 --12.74 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <91.4 85.46 09/25/19 --11.10 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <49.3 87.10 12/17/19 --11.56 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <95.4 86.64 04/02/20 --11.88 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <47.4 86.32 06/22/20 --11.45 -- <2.00 <1.00 <1.00 <1.00 1.17 <1.00 <50.0 <47.6 86.75 12/21/20 --12.85 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.5 85.35 03/24/21 --12.90 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.7 85.30 06/23/21 --12.68 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.6 85.52 09/14/21 --12.44 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.7 85.76 01/12/23 --13.15 --<5 <5 <12 <12 <12 <12 <125 <1,000 85.05 09/27/23 --11.82 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 <100 86.38 12/18/23 --12.41 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 <200 85.79 03/20/24 --11.29 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 266 86.91 200 5 1,000 700 10,000 700 1,000 1,000 -- 200 300 3,000 4,000 10,000 700 10,000 10,000 -- TABLE 2 Groundwater Monitoring and Analytical Results 7-Eleven Store No. 35508 712 South State Street, Clearfield, Utah MBTEXN Compounds (µg/L)Depth to LNAPL (feet) Depth to Groundwater (feet) LNAPL Thickness (feet) TPH-GRO (µg/L) Relative Groundwater Elevation (feet) Sample Location Date TPH-DRO (µg/L) NOT SAMPLED - GAUGE ONLY MW-1R5 MW-2 NOT SAMPLED - GAUGE ONLY Casing blocked with sediment. UDEQ DERR Initial Screening Level UDEQ DERR Tier 1 Screening Level MW-3R5 MW-2R MW-4R5 dft_dbs_35508_2024320.xlsx groundwater 1 of 3 Stantec Consulting Services Inc. . MTBE Benzene Toluene Ethyl- benzene Total Xylenes Naphthalene TABLE 2 Groundwater Monitoring and Analytical Results 7-Eleven Store No. 35508 712 South State Street, Clearfield, Utah MBTEXN Compounds (µg/L)Depth to LNAPL (feet) Depth to Groundwater (feet) LNAPL Thickness (feet) TPH-GRO (µg/L) Relative Groundwater Elevation (feet) Sample Location Date TPH-DRO (µg/L) 12/10/15 --11.61 -- <1.00 7,840 33,100 1,550 12,800 49.3 103,000 747 85.36 05/25/16 --10.26 -- <200 14,600 56,200 2,570 21,000 <1,000 251,000 1,500 86.71 11/01/16 --10.80 -- <1.00 3,390 46,500 2,530 18,800 81.8 152,000 2,000 86.17 03/03/17 9.17 9.18 0.01 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 87.80c 06/15/17 9.29 9.34 0.05 LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL LNAPL 87.67c 11/14/17 --10.53 -- <100 105 14,200 2,520 23,800 <500 115,000 4,180 86.44 03/21/18 --11.79 -- <100 <100 4,270 1,860 16,000 <500 71,800 3,640 85.18 06/28/18 --11.81 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <94.4 85.16 12/19/18 --11.78 -- <100 <100 9,410 1,640 15,200 <500 76,100 2,590 85.19 09/26/19 --10.12 --<500 2,450 40,800 2,590 24,000 <250 154,000 4,730 86.85 12/17/19 --10.57 --<1,000 <500 23,300 1,980 19,000 <500 86,400 <95.0 86.40 04/02/20 --10.86 --<500 <250 5,360 1,420 13,600 <250 41,100 2,680 86.11 06/22/20 --10.54 -- <200 <100 173 472 3,840 <100 13,100 2,440 86.43 12/21/20 --11.90 -- <100 <100 1,700 769 6,750 <200 27,900 2,550 85.07 03/24/21 --11.97 -- <10.0 <10.0 39.1 152 733 <20.0 4,590 1,260 85.00 06/23/21 --11.80 -- <10.0 <10.0 29.2 216 671 26.7 4,090 2,720 85.17 09/15/21 --11.56 -- <10.0 <10.0 48.4 216 1,060 23.7 4,950 1,640 85.41 01/12/23 --12.21 --<5 6 239 228 1,280 <12 3,590 5,400 84.76 09/27/23 --10.78 -- <25.0 71.1 17,300 2,450 20,300 <125 164,000 2,340 86.19 12/18/23 --11.41 -- <50.5 <47.1 11,900 1,920 18,800 <500 456,000 2,350 85.56 03/20/24 --10.19 -- <50.5 <47.1 10,400 2,180 21,500 <500 183,0007 5,180 86.78 12/10/15 --12.79 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <100 82.40 05/25/16 --11.25 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <89.3 83.94 11/01/16 --11.80 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <92.6 83.39 03/03/17 --9.99 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <92.6 85.20 06/15/17 --10.35 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <92.6 84.84 11/14/17 --11.91 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 126 83.28 03/21/18 --12.82 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <92.6 82.37 06/28/18 --12.24 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <94.7 82.95 12/19/18 --12.90 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <91.6 82.29 09/26/19 --11.20 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <46.4 83.99 12/17/19 --11.55 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 3,290 85.51 04/02/20 --11.97 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 65.6 85.09 06/22/20 --11.72 -- <2.00 <1.00 <1.00 <1.00 1.00 <1.00 <50.0 <47.4 85.34 12/21/20 --13.11 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.3 83.95 03/24/21 --13.11 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.7 83.95 06/22/21 --13.07 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.7 83.99 09/14/21 --12.78 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.6 84.28 01/12/23 --12.94 --<5 <5 <12 <12 <12 <12 <125 <1,000 84.12 09/27/23 --12.00 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 <100 85.06 12/18/23 --13.15 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 <200 83.91 03/20/24 --11.24 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 <100 85.82 12/10/15 --13.31 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <100 81.22 05/25/16 --11.82 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <100 82.71 11/01/16 --12.27 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <92.6 82.26 03/03/17 --10.67 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <92.6 83.86 06/15/17 --11.04 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <92.6 83.49 11/14/17 --12.35 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 89.3 82.18 03/21/18 --13.06 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <92.6 81.47 06/28/18 --12.56 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <94.8 81.97 12/19/18 --13.25 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <400 <94.1 81.28 09/26/19 --11.83 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <57.2 82.70 12/17/19 --12.03 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <98.0 84.37 04/02/20 --12.35 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 135 84.05 06/22/20 --12.05 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <47.4 84.35 12/21/20 --13.35 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.4 83.05 03/24/21 --13.34 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.8 83.06 06/22/21 --13.30 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.9 83.10 09/14/21 --12.96 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.7 83.44 01/12/23 --13.34 --<5 <5 <12 <12 <12 <12 <125 <1,000 83.06 09/27/23 --12.45 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 <100 83.95 12/18/23 --12.95 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 <200 83.45 03/20/24 --11.78 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 153 84.62 11/01/16 --12.45 -- <1.00 537 936 52.0 374 <5.00 4,650 <92.6 82.27 03/03/17 --10.76 -- <1.00 649 1,350 97.0 543 <5.00 6,820 103 83.96 06/15/17 --10.22 -- <10.0 1,730 4,720 274 1,860 205 9,740 219 84.50 11/14/17 --12.54 -- <5.00 404 708 64.5 324 <25.0 3,440 351 82.18 03/21/18 --13.34 -- <5.00 2,430 4,710 638 4,390 <25.0 35,300 1,040 81.38 06/28/18 --12.81 -- <50.0 3,200 9,390 1,170 7,560 <250 49,700 833 81.91 12/20/18 --13.44 -- <5.00 374 144 208 851 <25.0 4,310 790 81.28 09/26/19 --11.92 -- <2.00 7.08 <1.00 22.3 6.76 <1.00 97.2 <47.8 82.80 12/17/19 --12.15 -- <20.0 32.2 18.1 134 558 <10.0 1,850 205 84.44 04/02/20 --12.53 -- <20.0 88.2 32.9 99.6 479 <10.0 1,690 236 84.06 06/22/20 --12.25 --<2.004 11.94 34.34 17.24 86.54 <1.004 3464 139 84.34 12/21/20 --13.64 -- <10.0 47.3 18.7 196 818 <20.0 2,880 338 82.95 03/24/21 --13.57 -- <10.0 65.7 61.2 341 1,600 <20.0 5,780 373 83.02 06/22/21 --13.54 -- <50.0 107 84.9 594 3,790 <100 11,800 650 83.05 09/15/21 --13.22 -- <5.00 20.2 7.46 170 606 <10.0 2,090 309 83.37 01/12/23 --13.37 --<5 <5 <12 <12 51 <12 <125 <1,000 83.22 09/27/23 --12.60 -- <1.00 <1.00 <1.00 48.9 <3.00 <5.00 <500 1206 83.99 12/18/23 --13.00 -- <1.00 <1.00 <1.00 26.0 3.15 <5.00 <500 <100 83.59 03/20/24 --11.89 -- <1.00 <1.00 <1.00 1.75 <3.00 <5.00 <500 <100 84.70 11/14/17 ------ <1.00 145 233 368 1,360 13.7 7,130 688 -- 03/21/18 --13.84 -- <5.00 410 464 751 4,570 28.9 20,900 934 80.72 06/28/18 --13.52 -- <50.0 <50.0 51.4 839 4,320 <250 <20,000 834 81.04 12/20/18 --14.00 -- <50.0 1,820 2,110 841 5,560 <250 28,000 1,550 80.56 09/26/19 --12.65 -- <8.00 87.7 4.08 88.9 120 <4.00 670 286 81.91 12/17/19 --12.81 -- <20.0 113 33.6 238 833 <10.0 2,770 432 82.25 04/02/20 --13.14 -- <200 720 2,160 851 6,210 <100 18,600 893 81.92 06/22/20 --12.92 -- <100 164 57.0 519 3,350 <50.0 9,590 926 82.14 12/21/20 -------- ---------------- 03/24/21 --14.13 -- <5.00 7.54 25.0 157 668 10.9 2,900 491 80.93 06/22/21 --14.15 -- <0.500 1.49 <0.500 9.37 2.26 1.58 182 139 80.91 09/15/21 --13.80 -- <0.500 <0.500 <0.500 0.509 <0.500 <1.00 83.9 63.1 81.26 01/12/23 --13.93 --<5 <5 <12 <12 <12 <12 <125 <1,000 81.13 09/27/23 --14.25 -- <1.00 10.2 20.8 214 534 <5.00 2,150 <100 80.81 12/18/23 --13.41 -- <5.00 7.41 <5.00 150 262 <25.0 4,540 3796 81.65 03/20/24 --12.54 -- <5.00 17.7 <5.00 255 717 <25.0 2,500 766 82.52 200 5 1,000 700 10,000 700 1,000 1,000 -- 200 300 3,000 4,000 10,000 700 10,000 10,000 -- UDEQ DERR Initial Screening Level UDEQ DERR Tier 1 Screening Level MW-5R5 MW-6R MW-7R MW-8 MW-9 dft_dbs_35508_2024320.xlsx groundwater 2 of 3 Stantec Consulting Services Inc. . MTBE Benzene Toluene Ethyl- benzene Total Xylenes Naphthalene TABLE 2 Groundwater Monitoring and Analytical Results 7-Eleven Store No. 35508 712 South State Street, Clearfield, Utah MBTEXN Compounds (µg/L)Depth to LNAPL (feet) Depth to Groundwater (feet) LNAPL Thickness (feet) TPH-GRO (µg/L) Relative Groundwater Elevation (feet) Sample Location Date TPH-DRO (µg/L) 09/25/19 --12.17 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <49.5 80.96 12/17/19 --12.29 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <97.0 82.71 04/02/20 --12.61 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <47.4 82.39 06/22/20 --12.40 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <47.6 82.60 12/21/20 --13.67 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <48.1 81.33 03/24/21 --13.57 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 98.9 81.43 06/22/21 --13.59 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.7 81.41 09/14/21 --13.17 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.6 81.83 01/12/23 -------- 09/27/23 --12.55 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 <100 82.45 12/18/23 --14.20 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 <200 80.80 03/20/24 --12.04 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 110 82.96 09/25/19 --12.06 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 109 80.33 12/17/19 --12.06 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 105 82.20 04/02/20 --12.34 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <47.2 81.92 06/22/20 --12.25 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <47.6 82.01 12/21/20 -------- ---------------- 03/24/21 --13.29 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.6 80.97 06/22/21 --13.42 -- <0.500 1.63 <0.500 <0.500 <0.500 <1.00 <50.0 <47.3 80.84 09/15/21 --13.00 -- <1.00 19.8 <1.00 82.9 <1.00 <2.00 334 84.7 81.26 01/12/23 --12.94 --<5 <5 <12 <12 <12 <12 <125 <1,000 81.32 09/27/23 --12.74 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 1006 81.52 12/18/23 -- 12.88 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 1216 81.38 03/20/24 --11.73 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 413 82.53 09/25/19 --11.04 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <49.5 85.46 12/17/19 --11.65 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <97.2 86.72 04/02/20 --12.04 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <47.3 86.33 06/22/20 --11.72 -- <2.00 <1.00 <1.00 <1.00 <1.00 <1.00 <50.0 <47.4 86.65 12/21/20 --13.07 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.9 85.30 03/24/21 --13.13 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.7 85.24 06/23/21 --12.97 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.9 85.40 09/15/21 --12.82 -- <0.500 <0.500 <0.500 <0.500 <0.500 <1.00 <50.0 <47.8 85.55 01/12/23 --13.43 --<5 <5 <12 <12 <12 <12 <125 <1,000 84.94 09/27/23 --11.89 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 1116 86.48 12/18/23 -- 12.62 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 <100 85.75 03/20/24 --11.19 -- <1.00 <1.00 <1.00 <1.00 <3.00 <5.00 <500 117 87.18 200 5 1,000 700 10,000 700 1,000 1,000 -- 200 300 3,000 4,000 10,000 700 10,000 10,000 -- 01/12/23 <5 <5 <12 <12 <12 <12 <125 <1,000 -- ---- ---------------- 09/27/23 <1.00 9.20 19.1 228 510 <5.00 2,1006 <100 -- ---- 10% 9% 6% 5%--2%---- 12/18/23 <20.0 29.9 12,000 2,590 20,700 115 103,000 2,350 -- ---- --1% 30% 10%--126%0%-- 03/20/24 <10.1 42.2 8,370 1,630 16,600 <100 72,100 5,160 -- ---- -- 22% 29% 26%--87%0.39%-- Explanation of Abbreviations: DERR = Department of Environmental Response and Remediation LNAPL = light non-aqueous phase liquid (LNAPL) observed MBTEXN = methyl tert-butyl ether, benzene, toluene, ethylbenzene, total xylenes,MW-1R1 19 4 to 19 100.00 and naphthalene by EPA Method 8260B MW-23 15 5 to 15 98.32 µg/L = micrograms per liter MW-2R1 19 4 to 19 98.15 MTBE = methyl tertiary butyl ether MW-3R1 19 4 to 19 98.94 TPH-GRO = gasoline-range total petroleum hydrocarbons by EPA Method 8260B MW-4R1 19 4 to 19 98.20 TPH-DRO = diesel-range total petroleum hydrocarbons by EPA Method 8015D MW-5R1 19 4 to 19 96.97 UDEQ = Utah Department of Environmental Quality MW-6R1,3 19 4 to 19 97.06 RPD = Relative Percent Difference MW-7R1,3 19 4 to 19 96.40 -- = not observed, measured, analyzed, surveyed or applicable MW-83 19 4 to 19 96.59 < = analyte not detected above the laboratory specified reporting limit MW-92,3 20 5 to 20 95.06 c = corrected depth to water [depth to water - (0.75 x product thickness)MW-102,3 20 4 to 19 95.00 MW-112,3 20 4 to 19 94.26 bold = analytical result exceeds the specified UDEQ DERR Initial Screening Level MW-122,3 20 4 to 19 98.37 bold = analytical result exceeds the specified UDEQ DERR Initial Screening Level and Tier 1 Screening Level Notes:1= Original 1-inch OD wells MW-1 through MW-7 were replaced by new, 2-inch OD wells MW-1R through MW-7R in October 2016. Former wells MW-1, and MW-3 through MW-7 were properly abandoned on October 4 through 5, 2016. 2= Well MW-9 was installed on November 14, 2017. Wells MW-10, MW-11, and MW-12 were installed on August 29, 2019. 3= Wells were resurveyed on December 17, 2019. 4= MBTEXN and TPH-GRO analyses were performed outside of holding time due to analyst error; incorrect dilution applied to first analyses within hold time. 5= June 2021 depth to water measurements were collected on 6/22/2021. 6= The same analyte is found in the associated blank. 7= The identification of the analyte is acceptable; the reported value is an estimate. Blind Dup UDEQ DERR Tier 1 Screening Level RPD Analytical Results(Collected from MW-5R) Blind Dup (Collected from MW-5R) Analytical Results RPD MW-10 MW-11 MW-125 NOT SAMPLED - COVERED BY DUMPSTER Blind Dup UDEQ DERR Initial Screening Level Blind Dup RPD Analytical Results RPD Analytical Results (Collected from MW-9) (Collected from MW-11) Well No. Total Well Depth (feet) Screened Interval (feet) Top of Casing Elevation (feet) dft_dbs_35508_2024320.xlsx groundwater 3 of 3 Stantec Consulting Services Inc. Reference: Quarterly Groundwater Monitoring Report – 7-Eleven Store No. 35508 712 South State Street, Clearfield, Utah Facility ID 3000334, Release Site NGN GRAPHS dbs_35508_2024320.xlsx M-2R LNAPL Stantec Consulting Services, Inc. 9 10 11 12 13 14 150 0.5 1 1.5 2 2.5 No v - 1 6 Ma y - 1 7 No v - 1 7 Ma y - 1 8 No v - 1 8 Ma y - 1 9 No v - 1 9 Ma y - 2 0 Oc t - 2 0 Ma y - 2 1 Oc t - 2 1 Ma y - 2 2 Oc t - 2 2 Ma y - 2 3 Oc t - 2 3 Ap r - 2 4 De p t h t o G r o u n d w a t e r ( f e e t ) LN A P L T h i c k n e s s ( f e e t ) Date GRAPH 1 7-Eleven Store No. 35508 MW-2R LNAPL Thickness vs. Time LNAPL Recovery Events MW‐2R LNAPL Thickness MW‐2R Depth to GW 30 ‐da y  Ca l C l e a n E v e n t GRAPH 2 7-Eleven Store No. 35508 MW-5R Benzene Concentration vs. Time GRAPH 3 7-Eleven Store No. 35508 MW-5R TPH-GRO Concentration vs. Time dbs_35508_2024320.xlsx MW-5R Stantec Consulting Services, Inc. 8.5 9.5 10.5 11.5 12.51 10 100 1000 10000 100000 De c - 1 5 Ju n - 1 6 De c - 1 6 Ju n - 1 7 De c - 1 7 Ju n - 1 8 De c - 1 8 Ju n - 1 9 De c - 1 9 Ju n - 2 0 De c - 2 0 Ju n - 2 1 De c - 2 1 Ju n - 2 2 De c - 2 2 Ju n - 2 3 De c - 2 3 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 ( µ g / L ) DATE TSL ISL Benzene Depth to Groundwater Expon. (Benzene) 8.5 9.5 10.5 11.5 12.51 10 100 1000 10000 100000 1000000 De c - 1 5 Ju n - 1 6 De c - 1 6 Ju n - 1 7 De c - 1 7 Ju n - 1 8 De c - 1 8 Ju n - 1 9 De c - 1 9 Ju n - 2 0 De c - 2 0 Ju n - 2 1 De c - 2 1 Ju n - 2 2 De c - 2 2 Ju n - 2 3 De c - 2 3 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 ( µ g / L ) DATE TSL ISL TPH-GRO Depth to Groundwater Expon. (TPH-GRO) GRAPH 4 7-Eleven Store No. 35508 MW-8 Benzene Concentration vs. Time GRAPH 5 7-Eleven Store No. 35508 MW-8 TPH-GRO Concentration vs. Time dbs_35508_2024320.xlsx MW-8 Stantec Consulting Services, Inc. 10.0 10.5 11.0 11.5 12.0 12.5 13.0 13.5 14.01 10 100 1000 10000 No v - 1 6 Ma y - 1 7 No v - 1 7 Ma y - 1 8 No v - 1 8 Ma y - 1 9 No v - 1 9 Ma y - 2 0 No v - 2 0 Ma y - 2 1 No v - 2 1 Ma y - 2 2 No v - 2 2 Ma y - 2 3 No v - 2 3 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 ( µ g / L ) DATE TSL ISL Benzene Depth to Groundwater Expon. (Benzene) 10.0 10.5 11.0 11.5 12.0 12.5 13.0 13.5 14.01 10 100 1000 10000 100000 No v - 1 6 Ma y - 1 7 No v - 1 7 Ma y - 1 8 No v - 1 8 Ma y - 1 9 No v - 1 9 Ma y - 2 0 No v - 2 0 Ma y - 2 1 No v - 2 1 Ma y - 2 2 No v - 2 2 Ma y - 2 3 No v - 2 3 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 ( µ g / L ) DATE TSL ISL TPH-GRO Depth to Groundwater Expon. (TPH-GRO) GRAPH 6 7-Eleven Store No. 35508 MW-9 Benzene Concentration vs. Time GRAPH 7 7-Eleven Store No. 35508 MW-9 TPH-GRO Concentration vs. Time dbs_35508_2024320.xlsx MW-9 Stantec Consulting Services, Inc. 12.5 13.0 13.5 14.0 14.50.1 1 10 100 1000 10000 No v - 1 7 Ma y - 1 8 No v - 1 8 Ma y - 1 9 No v - 1 9 Ma y - 2 0 No v - 2 0 Ma y - 2 1 No v - 2 1 Ma y - 2 2 No v - 2 2 Ma y - 2 3 No v - 2 3 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 ( µ g / L ) DATE TSL ISL Benzene Depth to Groundwater Expon. (Benzene) 12.5 13.0 13.5 14.0 14.51 10 100 1000 10000 100000 No v - 1 7 Ma y - 1 8 No v - 1 8 Ma y - 1 9 No v - 1 9 Ma y - 2 0 No v - 2 0 Ma y - 2 1 No v - 2 1 Ma y - 2 2 No v - 2 2 Ma y - 2 3 No v - 2 3 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 ( µ g / L ) DATE TSL ISL TPH-GRO Depth to Groundwater Expon. (TPH-GRO) Reference: Quarterly Groundwater Monitoring Report – 7-Eleven Store No. 35508 712 South State Street, Clearfield, Utah Facility ID 3000334, Release Site NGN ATTACHMENT A Laboratory Analytical Report and Chain-of-Custody Documentation ANALYTICAL REPORT April 10, 2024 711 Stantec - Salt Lake City, UT Sample Delivery Group:L1718124 Samples Received:03/22/2024 Project Number:203720675 Description:7-11 #35508 Clearfield, UT Site:35508 Report To:Anna Skinner 2890 E Cottonwood Pkwy Suite 300 Salt Lake City, UT 84121 Entire Report Reviewed By: April 10, 2024 [Preliminary Report] Marty Edwards III Project Manager Results relate only to the items tested or calibrated and are reported as rounded values. This test report shall not be reproduced, except in full, without written approval of the laboratory. Where applicable, sampling conducted by Pace Analytical National is performed per guidance provided in laboratory standard operating procedures ENV-SOP-MTJL-0067 and ENV-SOP-MTJL-0068. Where sampling conducted by the customer, results relate to the accuracy of the information provided, and as the samples are received. Pace Analytical National 12065 Lebanon Rd Mount Juliet, TN 37122 615-758-5858 800-767-5859 www.pacenational.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 203720675 L1718124 04/10/24 15:48 1 of 28 April 10, 2024 Marty Edwards III Project Manager ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 1 of 28 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-1R L1718124-01 6 MW-3R L1718124-02 7 MW-4R L1718124-03 8 MW-5R L1718124-04 9 MW-6R L1718124-05 10 MW-7R L1718124-06 11 MW-8 L1718124-07 12 MW-9 L1718124-08 13 MW-10 L1718124-09 14 MW-11 L1718124-10 15 MW-12 L1718124-11 16 DUP-01 L1718124-12 17 TB-20240320 L1718124-13 18 Qc: Quality Control Summary 19 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 19 Semi-Volatile Organic Compounds (GC) by Method 3511/8015 24 Gl: Glossary of Terms 25 Al: Accreditations & Locations 26 Sc: Sample Chain of Custody 27 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 203720675 L1718124 04/10/24 15:48 2 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 2 of 28 SAMPLE SUMMARY Collected by Collected date/time Received date/time MW-1R L1718124-01 GW CF 03/20/24 11:20 03/22/24 09:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2256315 1 03/29/24 10:15 03/29/24 10:15 ADM Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2255563 1 03/29/24 05:56 03/29/24 18:29 MAA Mt. Juliet, TN Collected by Collected date/time Received date/time MW-3R L1718124-02 GW CF 03/20/24 13:40 03/22/24 09:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2256315 1 03/29/24 10:38 03/29/24 10:38 ADM Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2255563 1 03/29/24 05:56 03/29/24 18:49 MAA Mt. Juliet, TN Collected by Collected date/time Received date/time MW-4R L1718124-03 GW CF 03/20/24 13:10 03/22/24 09:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2256315 1 03/29/24 11:00 03/29/24 11:00 ADM Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2255563 1 03/29/24 05:56 03/29/24 19:09 MAA Mt. Juliet, TN Collected by Collected date/time Received date/time MW-5R L1718124-04 GW CF 03/20/24 15:20 03/22/24 09:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2258065 500 04/01/24 17:59 04/01/24 17:59 JBE Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2255563 1 03/29/24 05:56 03/29/24 19:29 MAA Mt. Juliet, TN Collected by Collected date/time Received date/time MW-6R L1718124-05 GW CF 03/20/24 13:25 03/22/24 09:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2256664 1 04/01/24 12:33 04/01/24 12:33 ACG Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2255563 1 03/29/24 05:56 04/05/24 10:38 MAA Mt. Juliet, TN Collected by Collected date/time Received date/time MW-7R L1718124-06 GW CF 03/20/24 12:20 03/22/24 09:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2256485 1 03/29/24 22:07 03/29/24 22:07 ADM Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2255563 1 03/29/24 05:56 03/29/24 20:09 MAA Mt. Juliet, TN Collected by Collected date/time Received date/time MW-8 L1718124-07 GW CF 03/20/24 15:22 03/22/24 09:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2256485 1 03/29/24 22:29 03/29/24 22:29 ADM Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2255563 1 03/29/24 05:56 03/29/24 20:29 MAA 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 203720675 L1718124 04/10/24 15:48 3 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 3 of 28 SAMPLE SUMMARY Collected by Collected date/time Received date/time MW-9 L1718124-08 GW CF 03/20/24 14:40 03/22/24 09:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2257166 5 04/01/24 13:42 04/01/24 13:42 ACG Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2255563 1 03/29/24 05:56 03/29/24 20:49 MAA Mt. Juliet, TN Collected by Collected date/time Received date/time MW-10 L1718124-09 GW CF 03/20/24 14:30 03/22/24 09:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2256485 1 03/29/24 22:50 03/29/24 22:50 ADM Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2255563 1 03/29/24 05:56 03/29/24 21:08 MAA Mt. Juliet, TN Collected by Collected date/time Received date/time MW-11 L1718124-10 GW CF 03/20/24 12:55 03/22/24 09:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2256485 1 03/29/24 23:12 03/29/24 23:12 ADM Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2255563 1 03/29/24 05:56 03/29/24 21:28 MAA Mt. Juliet, TN Collected by Collected date/time Received date/time MW-12 L1718124-11 GW CF 03/20/24 14:05 03/22/24 09:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2256485 1 03/29/24 23:33 03/29/24 23:33 ADM Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2255563 1 03/29/24 05:56 03/29/24 21:48 MAA Mt. Juliet, TN Collected by Collected date/time Received date/time DUP-01 L1718124-12 GW CF 03/20/24 00:00 03/22/24 09:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2257166 100 04/01/24 14:04 04/01/24 14:04 ACG Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2255563 1 03/29/24 05:56 03/29/24 22:08 MAA Mt. Juliet, TN Collected by Collected date/time Received date/time TB-20240320 L1718124-13 GW CF 03/20/24 00:00 03/22/24 09:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 WG2256485 1 03/29/24 14:37 03/29/24 14:37 ADM 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 203720675 L1718124 04/10/24 15:48 4 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 4 of 28 CASE NARRATIVE All sample aliquots were received at the correct temperature, in the proper containers, with the appropriate preservatives, and within method specified holding times, unless qualified or notated within the report. Where applicable, all MDL (LOD) and RDL (LOQ) values reported for environmental samples have been corrected for the dilution factor used in the analysis. All Method and Batch Quality Control are within established criteria except where addressed in this case narrative, a non-conformance form or properly qualified within the sample results. By my digital signature below, I affirm to the best of my knowledge, all problems/anomalies observed by the laboratory as having the potential to affect the quality of the data have been identified by the laboratory, and no information or data have been knowingly withheld that would affect the quality of the data. [Preliminary Report] Marty Edwards III Project Manager 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 15:48 5 of 28 Marty Edwards III Project Manager ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 5 of 28 SAMPLE RESULTS - 01 L1718124 MW-1R Collected date/time: 03/20/24 11:20 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/MS) Low Fraction ND 0.500 1 03/29/2024 10:15 WG2256315 Benzene ND 0.00100 1 03/29/2024 10:15 WG2256315 Toluene ND 0.00100 1 03/29/2024 10:15 WG2256315 Ethylbenzene ND 0.00100 1 03/29/2024 10:15 WG2256315 Xylenes, Total ND 0.00300 1 03/29/2024 10:15 WG2256315 Methyl tert-butyl ether ND 0.00100 1 03/29/2024 10:15 WG2256315 Naphthalene ND 0.00500 1 03/29/2024 10:15 WG2256315 (S) Toluene-d8 108 80.0-120 03/29/2024 10:15 WG2256315 (S) 4-Bromofluorobenzene 107 77.0-126 03/29/2024 10:15 WG2256315 (S) 1,2-Dichloroethane-d4 108 70.0-130 03/29/2024 10:15 WG2256315 Semi-Volatile Organic Compounds (GC) by Method 3511/8015 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 0.134 0.100 1 03/29/2024 18:29 WG2255563 (S) o-Terphenyl 75.3 52.0-156 03/29/2024 18:29 WG2255563 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 203720675 L1718124 04/10/24 15:48 6 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 6 of 28 SAMPLE RESULTS - 02 L1718124 MW-3R Collected date/time: 03/20/24 13:40 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/MS) Low Fraction ND 0.500 1 03/29/2024 10:38 WG2256315 Benzene ND 0.00100 1 03/29/2024 10:38 WG2256315 Toluene ND 0.00100 1 03/29/2024 10:38 WG2256315 Ethylbenzene ND 0.00100 1 03/29/2024 10:38 WG2256315 Xylenes, Total ND 0.00300 1 03/29/2024 10:38 WG2256315 Methyl tert-butyl ether ND 0.00100 1 03/29/2024 10:38 WG2256315 Naphthalene ND 0.00500 1 03/29/2024 10:38 WG2256315 (S) Toluene-d8 108 80.0-120 03/29/2024 10:38 WG2256315 (S) 4-Bromofluorobenzene 107 77.0-126 03/29/2024 10:38 WG2256315 (S) 1,2-Dichloroethane-d4 106 70.0-130 03/29/2024 10:38 WG2256315 Semi-Volatile Organic Compounds (GC) by Method 3511/8015 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 0.140 0.100 1 03/29/2024 18:49 WG2255563 (S) o-Terphenyl 77.9 52.0-156 03/29/2024 18:49 WG2255563 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 203720675 L1718124 04/10/24 15:48 7 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 7 of 28 SAMPLE RESULTS - 03 L1718124 MW-4R Collected date/time: 03/20/24 13:10 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/MS) Low Fraction ND 0.500 1 03/29/2024 11:00 WG2256315 Benzene ND 0.00100 1 03/29/2024 11:00 WG2256315 Toluene ND 0.00100 1 03/29/2024 11:00 WG2256315 Ethylbenzene ND 0.00100 1 03/29/2024 11:00 WG2256315 Xylenes, Total ND 0.00300 1 03/29/2024 11:00 WG2256315 Methyl tert-butyl ether ND 0.00100 1 03/29/2024 11:00 WG2256315 Naphthalene ND 0.00500 1 03/29/2024 11:00 WG2256315 (S) Toluene-d8 108 80.0-120 03/29/2024 11:00 WG2256315 (S) 4-Bromofluorobenzene 104 77.0-126 03/29/2024 11:00 WG2256315 (S) 1,2-Dichloroethane-d4 106 70.0-130 03/29/2024 11:00 WG2256315 Semi-Volatile Organic Compounds (GC) by Method 3511/8015 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 0.266 0.100 1 03/29/2024 19:09 WG2255563 (S) o-Terphenyl 76.8 52.0-156 03/29/2024 19:09 WG2255563 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 203720675 L1718124 04/10/24 15:48 8 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 8 of 28 SAMPLE RESULTS - 04 L1718124 MW-5R Collected date/time: 03/20/24 15:20 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/MS) Low Fraction 183 Z1 54.0 500 04/01/2024 17:59 WG2258065 Benzene ND 0.0471 500 04/01/2024 17:59 WG2258065 Toluene 10.4 0.500 500 04/01/2024 17:59 WG2258065 Ethylbenzene 2.18 0.500 500 04/01/2024 17:59 WG2258065 Xylenes, Total 21.5 1.50 500 04/01/2024 17:59 WG2258065 Methyl tert-butyl ether ND 0.0505 500 04/01/2024 17:59 WG2258065 Naphthalene ND 0.500 500 04/01/2024 17:59 WG2258065 (S) Toluene-d8 107 80.0-120 04/01/2024 17:59 WG2258065 (S) 4-Bromofluorobenzene 108 77.0-126 04/01/2024 17:59 WG2258065 (S) 1,2-Dichloroethane-d4 108 70.0-130 04/01/2024 17:59 WG2258065 Sample Narrative: L1718124-04 WG2258065: GRO, Benzene, MTBE and Naphthalene were reported to the MDL. Semi-Volatile Organic Compounds (GC) by Method 3511/8015 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 5.18 0.100 1 03/29/2024 19:29 WG2255563 (S) o-Terphenyl 76.3 52.0-156 03/29/2024 19:29 WG2255563 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 203720675 L1718124 04/10/24 15:48 9 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 9 of 28 SAMPLE RESULTS - 05 L1718124 MW-6R Collected date/time: 03/20/24 13:25 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/MS) Low Fraction ND 0.500 1 04/01/2024 12:33 WG2256664 Benzene ND 0.00100 1 04/01/2024 12:33 WG2256664 Toluene ND 0.00100 1 04/01/2024 12:33 WG2256664 Ethylbenzene ND 0.00100 1 04/01/2024 12:33 WG2256664 Xylenes, Total ND 0.00300 1 04/01/2024 12:33 WG2256664 Methyl tert-butyl ether ND 0.00100 1 04/01/2024 12:33 WG2256664 Naphthalene ND 0.00500 1 04/01/2024 12:33 WG2256664 (S) Toluene-d8 108 80.0-120 04/01/2024 12:33 WG2256664 (S) 4-Bromofluorobenzene 106 77.0-126 04/01/2024 12:33 WG2256664 (S) 1,2-Dichloroethane-d4 107 70.0-130 04/01/2024 12:33 WG2256664 Semi-Volatile Organic Compounds (GC) by Method 3511/8015 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction ND 0.100 1 04/05/2024 10:38 WG2255563 (S) o-Terphenyl 84.2 52.0-156 04/05/2024 10:38 WG2255563 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 203720675 L1718124 04/10/24 15:48 10 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 10 of 28 SAMPLE RESULTS - 06 L1718124 MW-7R Collected date/time: 03/20/24 12:20 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/MS) Low Fraction ND 0.500 1 03/29/2024 22:07 WG2256485 Benzene ND 0.00100 1 03/29/2024 22:07 WG2256485 Toluene ND 0.00100 1 03/29/2024 22:07 WG2256485 Ethylbenzene ND 0.00100 1 03/29/2024 22:07 WG2256485 Xylenes, Total ND 0.00300 1 03/29/2024 22:07 WG2256485 Methyl tert-butyl ether ND 0.00100 1 03/29/2024 22:07 WG2256485 Naphthalene ND 0.00500 1 03/29/2024 22:07 WG2256485 (S) Toluene-d8 104 80.0-120 03/29/2024 22:07 WG2256485 (S) 4-Bromofluorobenzene 99.2 77.0-126 03/29/2024 22:07 WG2256485 (S) 1,2-Dichloroethane-d4 126 70.0-130 03/29/2024 22:07 WG2256485 Semi-Volatile Organic Compounds (GC) by Method 3511/8015 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 0.153 0.100 1 03/29/2024 20:09 WG2255563 (S) o-Terphenyl 75.3 52.0-156 03/29/2024 20:09 WG2255563 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 203720675 L1718124 04/10/24 15:48 11 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 11 of 28 SAMPLE RESULTS - 07 L1718124 MW-8 Collected date/time: 03/20/24 15:22 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/MS) Low Fraction ND 0.500 1 03/29/2024 22:29 WG2256485 Benzene ND 0.00100 1 03/29/2024 22:29 WG2256485 Toluene ND 0.00100 1 03/29/2024 22:29 WG2256485 Ethylbenzene 0.00175 0.00100 1 03/29/2024 22:29 WG2256485 Xylenes, Total ND 0.00300 1 03/29/2024 22:29 WG2256485 Methyl tert-butyl ether ND 0.00100 1 03/29/2024 22:29 WG2256485 Naphthalene ND 0.00500 1 03/29/2024 22:29 WG2256485 (S) Toluene-d8 102 80.0-120 03/29/2024 22:29 WG2256485 (S) 4-Bromofluorobenzene 98.1 77.0-126 03/29/2024 22:29 WG2256485 (S) 1,2-Dichloroethane-d4 125 70.0-130 03/29/2024 22:29 WG2256485 Semi-Volatile Organic Compounds (GC) by Method 3511/8015 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction ND 0.100 1 03/29/2024 20:29 WG2255563 (S) o-Terphenyl 73.2 52.0-156 03/29/2024 20:29 WG2255563 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 203720675 L1718124 04/10/24 15:48 12 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 12 of 28 SAMPLE RESULTS - 08 L1718124 MW-9 Collected date/time: 03/20/24 14:40 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/MS) Low Fraction ND 2.50 5 04/01/2024 13:42 WG2257166 Benzene 0.0177 0.00500 5 04/01/2024 13:42 WG2257166 Toluene ND 0.00500 5 04/01/2024 13:42 WG2257166 Ethylbenzene 0.255 0.00500 5 04/01/2024 13:42 WG2257166 Xylenes, Total 0.717 0.0150 5 04/01/2024 13:42 WG2257166 Methyl tert-butyl ether ND 0.00500 5 04/01/2024 13:42 WG2257166 Naphthalene ND 0.0250 5 04/01/2024 13:42 WG2257166 (S) Toluene-d8 106 80.0-120 04/01/2024 13:42 WG2257166 (S) 4-Bromofluorobenzene 108 77.0-126 04/01/2024 13:42 WG2257166 (S) 1,2-Dichloroethane-d4 106 70.0-130 04/01/2024 13:42 WG2257166 Semi-Volatile Organic Compounds (GC) by Method 3511/8015 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 0.766 0.100 1 03/29/2024 20:49 WG2255563 (S) o-Terphenyl 75.3 52.0-156 03/29/2024 20:49 WG2255563 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 203720675 L1718124 04/10/24 15:48 13 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 13 of 28 SAMPLE RESULTS - 09 L1718124 MW-10 Collected date/time: 03/20/24 14:30 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/MS) Low Fraction ND 0.500 1 03/29/2024 22:50 WG2256485 Benzene ND 0.00100 1 03/29/2024 22:50 WG2256485 Toluene ND 0.00100 1 03/29/2024 22:50 WG2256485 Ethylbenzene ND 0.00100 1 03/29/2024 22:50 WG2256485 Xylenes, Total ND 0.00300 1 03/29/2024 22:50 WG2256485 Methyl tert-butyl ether ND 0.00100 1 03/29/2024 22:50 WG2256485 Naphthalene ND 0.00500 1 03/29/2024 22:50 WG2256485 (S) Toluene-d8 105 80.0-120 03/29/2024 22:50 WG2256485 (S) 4-Bromofluorobenzene 103 77.0-126 03/29/2024 22:50 WG2256485 (S) 1,2-Dichloroethane-d4 126 70.0-130 03/29/2024 22:50 WG2256485 Semi-Volatile Organic Compounds (GC) by Method 3511/8015 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 0.110 0.100 1 03/29/2024 21:08 WG2255563 (S) o-Terphenyl 69.5 52.0-156 03/29/2024 21:08 WG2255563 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 203720675 L1718124 04/10/24 15:48 14 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 14 of 28 SAMPLE RESULTS - 10 L1718124 MW-11 Collected date/time: 03/20/24 12:55 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/MS) Low Fraction ND 0.500 1 03/29/2024 23:12 WG2256485 Benzene ND 0.00100 1 03/29/2024 23:12 WG2256485 Toluene ND 0.00100 1 03/29/2024 23:12 WG2256485 Ethylbenzene ND 0.00100 1 03/29/2024 23:12 WG2256485 Xylenes, Total ND 0.00300 1 03/29/2024 23:12 WG2256485 Methyl tert-butyl ether ND 0.00100 1 03/29/2024 23:12 WG2256485 Naphthalene ND 0.00500 1 03/29/2024 23:12 WG2256485 (S) Toluene-d8 103 80.0-120 03/29/2024 23:12 WG2256485 (S) 4-Bromofluorobenzene 99.0 77.0-126 03/29/2024 23:12 WG2256485 (S) 1,2-Dichloroethane-d4 127 70.0-130 03/29/2024 23:12 WG2256485 Semi-Volatile Organic Compounds (GC) by Method 3511/8015 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 0.413 0.100 1 03/29/2024 21:28 WG2255563 (S) o-Terphenyl 73.7 52.0-156 03/29/2024 21:28 WG2255563 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 203720675 L1718124 04/10/24 15:48 15 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 15 of 28 SAMPLE RESULTS - 11 L1718124 MW-12 Collected date/time: 03/20/24 14:05 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/MS) Low Fraction ND 0.500 1 03/29/2024 23:33 WG2256485 Benzene ND 0.00100 1 03/29/2024 23:33 WG2256485 Toluene ND 0.00100 1 03/29/2024 23:33 WG2256485 Ethylbenzene ND 0.00100 1 03/29/2024 23:33 WG2256485 Xylenes, Total ND 0.00300 1 03/29/2024 23:33 WG2256485 Methyl tert-butyl ether ND 0.00100 1 03/29/2024 23:33 WG2256485 Naphthalene ND 0.00500 1 03/29/2024 23:33 WG2256485 (S) Toluene-d8 104 80.0-120 03/29/2024 23:33 WG2256485 (S) 4-Bromofluorobenzene 98.9 77.0-126 03/29/2024 23:33 WG2256485 (S) 1,2-Dichloroethane-d4 126 70.0-130 03/29/2024 23:33 WG2256485 Semi-Volatile Organic Compounds (GC) by Method 3511/8015 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 0.117 0.100 1 03/29/2024 21:48 WG2255563 (S) o-Terphenyl 79.5 52.0-156 03/29/2024 21:48 WG2255563 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 203720675 L1718124 04/10/24 15:48 16 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 16 of 28 SAMPLE RESULTS - 12 L1718124 DUP-01 Collected date/time: 03/20/24 00:00 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/MS) Low Fraction 72.1 50.0 100 04/01/2024 14:04 WG2257166 Benzene 0.0422 Z1 0.00941 100 04/01/2024 14:04 WG2257166 Toluene 8.37 0.100 100 04/01/2024 14:04 WG2257166 Ethylbenzene 1.63 0.100 100 04/01/2024 14:04 WG2257166 Xylenes, Total 16.6 0.300 100 04/01/2024 14:04 WG2257166 Methyl tert-butyl ether ND 0.0101 100 04/01/2024 14:04 WG2257166 Naphthalene ND 0.100 100 04/01/2024 14:04 WG2257166 (S) Toluene-d8 108 80.0-120 04/01/2024 14:04 WG2257166 (S) 4-Bromofluorobenzene 108 77.0-126 04/01/2024 14:04 WG2257166 (S) 1,2-Dichloroethane-d4 106 70.0-130 04/01/2024 14:04 WG2257166 Sample Narrative: L1718124-12 WG2257166: Benzene, MTBE and Naphthalene were reported to the MDL. Semi-Volatile Organic Compounds (GC) by Method 3511/8015 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/FID) High Fraction 5.16 0.100 1 03/29/2024 22:08 WG2255563 (S) o-Terphenyl 78.4 52.0-156 03/29/2024 22:08 WG2255563 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 203720675 L1718124 04/10/24 15:48 17 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 17 of 28 SAMPLE RESULTS - 13 L1718124 TB-20240320 Collected date/time: 03/20/24 00:00 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 Result Qualifier RDL Dilution Analysis Batch Analyte mg/l mg/l date / time TPH (GC/MS) Low Fraction ND 0.500 1 03/29/2024 14:37 WG2256485 Benzene ND 0.00100 1 03/29/2024 14:37 WG2256485 Toluene ND 0.00100 1 03/29/2024 14:37 WG2256485 Ethylbenzene ND 0.00100 1 03/29/2024 14:37 WG2256485 Xylenes, Total ND 0.00300 1 03/29/2024 14:37 WG2256485 Methyl tert-butyl ether ND 0.00100 1 03/29/2024 14:37 WG2256485 Naphthalene ND 0.00500 1 03/29/2024 14:37 WG2256485 (S) Toluene-d8 104 80.0-120 03/29/2024 14:37 WG2256485 (S) 4-Bromofluorobenzene 100 77.0-126 03/29/2024 14:37 WG2256485 (S) 1,2-Dichloroethane-d4 117 70.0-130 03/29/2024 14:37 WG2256485 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 203720675 L1718124 04/10/24 15:48 18 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 18 of 28 QUALITY CONTROL SUMMARYWG2256315 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 L1718124-01,02,03 Method Blank (MB) (MB) R4051517-4 03/29/24 01:21 MB Result MB Qualifier MB MDL MB RDL Analyte mg/l mg/l mg/l TPH (GC/MS) Low Fraction U 0.108 0.500 Benzene U 0.0000941 0.00100 Toluene U 0.000278 0.00100 Ethylbenzene U 0.000137 0.00100 Xylenes, Total U 0.000174 0.00300 Methyl tert-butyl ether U 0.000101 0.00100 Naphthalene U 0.00100 0.00500 (S) Toluene-d8 106 80.0-120 (S) 4-Bromofluorobenzene 104 77.0-126 (S) 1,2-Dichloroethane-d4 105 70.0-130 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R4051517-1 03/28/24 23:05 • (LCSD) R4051517-2 03/28/24 23:27 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 0.00482 0.00485 96.4 97.0 70.0-123 0.620 20 Toluene 0.00500 0.00515 0.00532 103 106 79.0-120 3.25 20 Ethylbenzene 0.00500 0.00496 0.00499 99.2 99.8 79.0-123 0.603 20 Xylenes, Total 0.0150 0.0148 0.0150 98.7 100 79.0-123 1.34 20 Methyl tert-butyl ether 0.00500 0.00504 0.00496 101 99.2 68.0-125 1.60 20 Naphthalene 0.00500 0.00405 0.00426 81.0 85.2 54.0-135 5.05 20 (S) Toluene-d8 107 108 80.0-120 (S) 4-Bromofluorobenzene 105 106 77.0-126 (S) 1,2-Dichloroethane-d4 109 105 70.0-130 Laboratory Control Sample (LCS) (LCS) R4051517-3 03/29/24 00:35 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte mg/l mg/l %% TPH (GC/MS) Low Fraction 5.00 4.19 83.8 66.0-132 (S) Toluene-d8 111 80.0-120 (S) 4-Bromofluorobenzene 116 77.0-126 (S) 1,2-Dichloroethane-d4 107 70.0-130 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 15:48 19 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 19 of 28 QUALITY CONTROL SUMMARYWG2256485 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 L1718124-06,07,09,10,11,13 Method Blank (MB) (MB) R4051799-4 03/29/24 13:15 MB Result MB Qualifier MB MDL MB RDL Analyte mg/l mg/l mg/l TPH (GC/MS) Low Fraction U 0.108 0.500 Benzene U 0.0000941 0.00100 Toluene U 0.000278 0.00100 Ethylbenzene U 0.000137 0.00100 Xylenes, Total U 0.000174 0.00300 Methyl tert-butyl ether U 0.000101 0.00100 Naphthalene U 0.00100 0.00500 (S) Toluene-d8 105 80.0-120 (S) 4-Bromofluorobenzene 99.3 77.0-126 (S) 1,2-Dichloroethane-d4 114 70.0-130 Laboratory Control Sample (LCS) (LCS) R4051799-1 03/29/24 11:49 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte mg/l mg/l %% Benzene 0.00500 0.00503 101 70.0-123 Toluene 0.00500 0.00521 104 79.0-120 Ethylbenzene 0.00500 0.00519 104 79.0-123 Xylenes, Total 0.0150 0.0158 105 79.0-123 Methyl tert-butyl ether 0.00500 0.00539 108 68.0-125 Naphthalene 0.00500 0.00409 81.8 54.0-135 (S) Toluene-d8 100 80.0-120 (S) 4-Bromofluorobenzene 97.9 77.0-126 (S) 1,2-Dichloroethane-d4 122 70.0-130 Laboratory Control Sample (LCS) (LCS) R4051799-2 03/29/24 12:11 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte mg/l mg/l %% TPH (GC/MS) Low Fraction 5.00 4.63 92.6 66.0-132 (S) Toluene-d8 98.9 80.0-120 (S) 4-Bromofluorobenzene 104 77.0-126 (S) 1,2-Dichloroethane-d4 118 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 203720675 L1718124 04/10/24 15:48 20 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 20 of 28 QUALITY CONTROL SUMMARYWG2256664 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 L1718124-05 Method Blank (MB) (MB) R4052365-4 04/01/24 11:56 MB Result MB Qualifier MB MDL MB RDL Analyte mg/l mg/l mg/l TPH (GC/MS) Low Fraction U 0.108 0.500 Benzene U 0.0000941 0.00100 Toluene U 0.000278 0.00100 Ethylbenzene U 0.000137 0.00100 Xylenes, Total U 0.000174 0.00300 Methyl tert-butyl ether U 0.000101 0.00100 Naphthalene U 0.00100 0.00500 (S) Toluene-d8 107 80.0-120 (S) 4-Bromofluorobenzene 106 77.0-126 (S) 1,2-Dichloroethane-d4 106 70.0-130 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R4052365-1 04/01/24 08:54 • (LCSD) R4052365-2 04/01/24 09:17 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 0.00457 0.00490 91.4 98.0 70.0-123 6.97 20 Toluene 0.00500 0.00499 0.00529 99.8 106 79.0-120 5.84 20 Ethylbenzene 0.00500 0.00472 0.00512 94.4 102 79.0-123 8.13 20 Xylenes, Total 0.0150 0.0145 0.0151 96.7 101 79.0-123 4.05 20 Methyl tert-butyl ether 0.00500 0.00498 0.00486 99.6 97.2 68.0-125 2.44 20 Naphthalene 0.00500 0.00417 0.00437 83.4 87.4 54.0-135 4.68 20 (S) Toluene-d8 109 107 80.0-120 (S) 4-Bromofluorobenzene 108 107 77.0-126 (S) 1,2-Dichloroethane-d4 108 107 70.0-130 Laboratory Control Sample (LCS) (LCS) R4052365-3 04/01/24 11:11 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte mg/l mg/l %% TPH (GC/MS) Low Fraction 5.00 4.26 85.2 66.0-132 (S) Toluene-d8 110 80.0-120 (S) 4-Bromofluorobenzene 121 77.0-126 (S) 1,2-Dichloroethane-d4 109 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 203720675 L1718124 04/10/24 15:48 21 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 21 of 28 QUALITY CONTROL SUMMARYWG2257166 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 L1718124-08,12 Method Blank (MB) (MB) R4052366-4 04/01/24 11:56 MB Result MB Qualifier MB MDL MB RDL Analyte mg/l mg/l mg/l TPH (GC/MS) Low Fraction U 0.108 0.500 Benzene U 0.0000941 0.00100 Toluene U 0.000278 0.00100 Ethylbenzene U 0.000137 0.00100 Xylenes, Total U 0.000174 0.00300 Methyl tert-butyl ether U 0.000101 0.00100 Naphthalene U 0.00100 0.00500 (S) Toluene-d8 107 80.0-120 (S) 4-Bromofluorobenzene 106 77.0-126 (S) 1,2-Dichloroethane-d4 106 70.0-130 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R4052366-1 04/01/24 08:54 • (LCSD) R4052366-2 04/01/24 09:17 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 0.00457 0.00490 91.4 98.0 70.0-123 6.97 20 Toluene 0.00500 0.00499 0.00529 99.8 106 79.0-120 5.84 20 Ethylbenzene 0.00500 0.00472 0.00512 94.4 102 79.0-123 8.13 20 Xylenes, Total 0.0150 0.0145 0.0151 96.7 101 79.0-123 4.05 20 Methyl tert-butyl ether 0.00500 0.00498 0.00486 99.6 97.2 68.0-125 2.44 20 Naphthalene 0.00500 0.00417 0.00437 83.4 87.4 54.0-135 4.68 20 (S) Toluene-d8 109 107 80.0-120 (S) 4-Bromofluorobenzene 108 107 77.0-126 (S) 1,2-Dichloroethane-d4 108 107 70.0-130 Laboratory Control Sample (LCS) (LCS) R4052366-3 04/01/24 11:11 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte mg/l mg/l %% TPH (GC/MS) Low Fraction 5.00 4.26 85.2 66.0-132 (S) Toluene-d8 110 80.0-120 (S) 4-Bromofluorobenzene 121 77.0-126 (S) 1,2-Dichloroethane-d4 109 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 203720675 L1718124 04/10/24 15:48 22 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 22 of 28 QUALITY CONTROL SUMMARYWG2258065 Volatile Organic Compounds (GC/MS) by Method 8260B/8260B/OA1 L1718124-04 Method Blank (MB) (MB) R4052367-4 04/01/24 11:56 MB Result MB Qualifier MB MDL MB RDL Analyte mg/l mg/l mg/l TPH (GC/MS) Low Fraction U 0.108 0.500 Benzene U 0.0000941 0.00100 Toluene U 0.000278 0.00100 Ethylbenzene U 0.000137 0.00100 Xylenes, Total U 0.000174 0.00300 Methyl tert-butyl ether U 0.000101 0.00100 Naphthalene U 0.00100 0.00500 (S) Toluene-d8 107 80.0-120 (S) 4-Bromofluorobenzene 106 77.0-126 (S) 1,2-Dichloroethane-d4 106 70.0-130 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R4052367-1 04/01/24 08:54 • (LCSD) R4052367-2 04/01/24 09:17 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 0.00457 0.00490 91.4 98.0 70.0-123 6.97 20 Toluene 0.00500 0.00499 0.00529 99.8 106 79.0-120 5.84 20 Ethylbenzene 0.00500 0.00472 0.00512 94.4 102 79.0-123 8.13 20 Xylenes, Total 0.0150 0.0145 0.0151 96.7 101 79.0-123 4.05 20 Methyl tert-butyl ether 0.00500 0.00498 0.00486 99.6 97.2 68.0-125 2.44 20 Naphthalene 0.00500 0.00417 0.00437 83.4 87.4 54.0-135 4.68 20 (S) Toluene-d8 109 107 80.0-120 (S) 4-Bromofluorobenzene 108 107 77.0-126 (S) 1,2-Dichloroethane-d4 108 107 70.0-130 Laboratory Control Sample (LCS) (LCS) R4052367-3 04/01/24 11:11 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte mg/l mg/l %% TPH (GC/MS) Low Fraction 5.00 4.26 85.2 66.0-132 (S) Toluene-d8 110 80.0-120 (S) 4-Bromofluorobenzene 121 77.0-126 (S) 1,2-Dichloroethane-d4 109 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 203720675 L1718124 04/10/24 15:48 23 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 23 of 28 QUALITY CONTROL SUMMARYWG2255563 Semi-Volatile Organic Compounds (GC) by Method 3511/8015 L1718124-01,02,03,04,05,06,07,08,09,10,11,12 Method Blank (MB) (MB) R4051692-1 03/29/24 11:32 MB Result MB Qualifier MB MDL MB RDL Analyte mg/l mg/l mg/l TPH (GC/FID) High Fraction U 0.0247 0.100 (S) o-Terphenyl 74.5 52.0-156 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R4051692-2 03/29/24 11:52 • (LCSD) R4051692-3 03/29/24 12:12 Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits Analyte mg/l mg/l mg/l %%%%% TPH (GC/FID) High Fraction 1.50 1.57 1.58 105 105 50.0-150 0.635 20 (S) o-Terphenyl 78.5 83.0 52.0-156 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 15:48 24 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 24 of 28 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 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 203720675 L1718124 04/10/24 15:48 25 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 25 of 28 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 203720675 L1718124 04/10/24 15:48 26 of 28 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: 711 Stantec - Salt Lake City, UT 203720675 L1718124 04/10/24 16:55 26 of 28