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HomeMy WebLinkAboutDERR-2024-005995Underwood Environmental Consulting, Inc. 9475 N. Silver Creek Rd., Park City, Utah 84098  Phone 801-831-6966  Fax 888-472-0977 GROUNDWATER MONITORING REPORT March 2024 Work Plan OBD-03 April 13, 2024 West Winds Truck Stop 1085 East Main Street Green River, Utah Facility ID #5000275, Release Site OBD Submitted To: Allen Burns West Winds Development and General Manager Yardley Green River, LLC P.O. Box 570 Green River, Utah 84525 Copy To: Ms. Nicole Chavez Department of Environmental Quality Division of Environmental Response and Remediation P.O. Box 144840 Salt Lake City, Utah 84114-4840 Groundwater Monitoring Report – March 2024 West Winds Truck Stop 1085 East Main St., Green River, UT Facility ID #5000275, Release Site OBD Underwood Environmental Consulting, Inc. 1 1.0 INTRODUCTION Underwood Environmental Consulting, Inc. (UEC) has been retained by West Winds Development to perform groundwater monitoring at the West Winds Truck Stop (owned and operated by Yardley Green River, LLC). The project site, located at 1085 East Main Street, Green River, Utah, includes a convenience store, retail and commercial fueling facilities, repair shop, restaurant and motel (Figure 1). The groundwater monitoring event was conducted to assess groundwater conditions at the truck stop. The site is eligible for Petroleum Storage Tank (PST) Fund reimbursement. The Utah Division of Environmental Response and Remediation (DERR) identifies the project site as Facility ID #5000275, Release Site OBD. 2.0 BACKGROUND Release OBD was opened based upon the reported findings of a Phase II Environmental Site Assessment (ESA) performed by Broadbent and Associates, Inc. for Pilot Travel Centers. The Phase II ESA reported several soil and groundwater samples with hydrocarbon concentrations in excess of Utah Initial Screening Levels (ISLs) (Broadbent, 2021). UEC performed a subsurface investigation at the site in October – November 2021. At that time, four existing monitoring wells were encountered around the commercial dispenser canopy perimeter. The existing monitoring wells were apparently installed in 1994 and have been designated as MW-NW, MW-NE, MW-SW, and MW-SE. During the groundwater sampling event associated with the investigation, free product was observed at monitoring well MW-SE (Table 1; Table 2; Figure 1). The source of free product observed is unknown, but, appears likely the result of surface spills at the commercial dispenser area (UEC, 2021). During groundwater sampling in November 2021, free product was also observed at newly installed monitoring well MW-7 (Table 1; Table 2; Figure 1). The source of free product observed at this location is also unknown, but, potential up-gradient sources to the north should be considered based on the prevailing groundwater flow direction (UEC, 2021). 3.0 METHODOLOGY 3.1 Free Product Checks Periodic free product checks are being conducted at the site. Up to six monitoring wells (MW-2, MW-3, MW-5, MW-6, MW-7, and MW-SE) have been checked for the presence of free product, or lack thereof, since April 2022. The wells are checked using an interface probe, disposable bailer, or both. The results of free product checks are presented on Table 1. Groundwater Monitoring Report – March 2024 West Winds Truck Stop 1085 East Main St., Green River, UT Facility ID #5000275, Release Site OBD Underwood Environmental Consulting, Inc. 2 3.2 Groundwater Monitoring On March 16, 2024, water levels were measured in eleven monitoring wells using an electronic water level indicator or interface probe. The monitor wells, lacking substantial free product, were subsequently purged of three casing volumes of water on March 17th prior to sampling. A separate disposable bailer was utilized to sample each well. The groundwater samples were labeled appropriately, placed on ice, and submitted to the laboratory under chain-of-custody. The groundwater samples were analyzed for methyl tertiary butyl ether (MTBE), benzene, toluene, ethylbenzene, total xylenes, naphthalene (BTEXN), total petroleum hydrocarbons – gasoline range organics (TPH-GRO), and TPH – diesel range organics (TPH-DRO) using EPA methods 8260B/C, 8260D, and 8015C. 4.0 RESULTS 4.1 Free Product Observation Measurable free product has been observed at three monitoring well locations over the past two years. In October 2022, free product samples were obtained from MW-SE and MW-7 and analyzed for “product ID”. The gas chromatographs for each sample were very similar and the laboratory concluded that the samples were identical diesel product of some kind (UEC, 2022). The free product observed in the field at MW-SE and MW-7, however, differs visually in appearance (color). In March 2024, the product thickness measured at MW-SE was 4.98 feet, and MW-7 contained 3.43 feet. The product thickness observed at monitoring well MW-6 was 0.01 feet (Table 1; Table 2; Figure 1). Based on the free product checks (Table 1), measured product thickness continues to be substantial at MW-SE and MW-7. A free product recovery test utilizing a vacuum truck would provide useful information for free product recovery in this area. 4.2 Depth to Water and Flow Direction On March 16, 2024, the depth to groundwater ranged from 7.80 to 12.42 feet below top-of- casing (TOC) (Table 2). Figure 1 depicts a groundwater contour map for the project site on the same date. The groundwater elevations at the two or three wells containing free product were corrected by applying Archimedes principle and an assumed specific gravity of 0.85 for diesel fuel. Based on the measured and calculated groundwater elevations, the groundwater flow direction was determined to be southerly. Groundwater Monitoring Report – March 2024 West Winds Truck Stop 1085 East Main St., Green River, UT Facility ID #5000275, Release Site OBD Underwood Environmental Consulting, Inc. 3 4.3 Groundwater Analytical Results Nine monitoring wells were purged and sampled on March 17, 2024. The groundwater analytical results presented on Table 2 are compared with Initial Screening Levels (ISLs) and Tier 1 Levels (DERR, 2005). Of the nine groundwater monitoring wells sampled, three wells exceeded the ISL for benzene, two wells exceeded the ISL for TPH-DRO, and one well exceeded the ISL for TPH-GRO. The highest benzene concentration detected in groundwater was 3.02 mg/L at MW-2. The highest TPH-DRO and TPH-GRO concentrations detected in groundwater were 5.8 mg/L and 7.45 mg/L, respectively, also at MW-2 (Table 2). No hydrocarbon concentrations were detected in groundwater at MW-4, MW-5, MW-NW, MW- NE, or MW-SW (Table 2). The laboratory analytical reports for the March 2024 groundwater monitoring event are provided as an attachment. 5.0 CONCLUSIONS Based on field observations, free product checks, and the March 2024 groundwater analytical results, the following conclusions are presented: • Depth to groundwater ranged from approximately 7.8 to 12.4 feet below top of well casing. • The groundwater flow direction was determined to be southerly. • The ISL for benzene was exceeded at three well locations. The highest benzene concentration detected in groundwater was 3.02 mg/L at MW-2. • The ISL was exceeded for TPH-DRO at two well locations. The highest TPH-DRO concentration detected in groundwater was 5.8 mg/L at MW-2. • The ISL was exceeded for TPH-GRO at one well location. The highest TPH-GRO concentration detected in groundwater was 7.45 mg/L at MW-2. • Free product was observed at three monitoring well locations. The greatest free product thickness observed was 4.98 feet at MW-SE. Groundwater Monitoring Report – March 2024 West Winds Truck Stop 1085 East Main St., Green River, UT Facility ID #5000275, Release Site OBD Underwood Environmental Consulting, Inc. 4 Based on the conclusions above, UEC recommends the following; • Continue groundwater monitoring, and • Conduct a free product recovery test utilizing vacuum truck extraction at MW-SE and MW-7. Submittal of this groundwater monitoring report concludes the tasks approved under work plan OBD-03. 6.0 LIMITATIONS Our services consist of professional opinions from a state-certified consultant, made in general accordance with locally accepted environmental practices at the time of execution. Environmental samples are obtained from specific locations, utilizing methodologies consistent with Utah Department of Environmental Quality regulations. UEC makes no guarantee, either expressed or implied, that the analytical results accurately represent subsurface conditions throughout the entire project site. Sincerely, Underwood Environmental Consulting, Inc. James A. McReel, P.G. L. Earl Underwood, P.G. Project Geologist, CC-0044 Sr. Geologist, CC-0018 Attachments: Table 1 Free Product Check Record Table 2 Groundwater Monitoring Data Figure 1 Groundwater Contour Map – March 16, 2024 Laboratory Analytical Reports Groundwater Monitoring Report – March 2024 West Winds Truck Stop 1085 East Main St., Green River, UT Facility ID #5000275, Release Site OBD Underwood Environmental Consulting, Inc. 5 References Cited: Broadbent, 2021 Limited Phase II Environmental Site Assessment, Pilot Travel Center #892, 1085 East Main Street, Green River, Utah: Broadbent and Associates, Inc., Draper, Utah, June 1, 2021. DERR, 2005 Utah LUST Program Screening Levels for Soil and Groundwater: Utah Division of Environmental Response and Remediation, Salt Lake City, Utah, November 1, 2005. UEC, 2021 Subsurface Investigation Report, Release OBD, West Winds Truck Stop, 1085 East Main Street, Green River, Utah, Facility ID #5000275, Release Site OBD: Underwood Environmental Consulting, Inc., Park City, Utah, December 6, 2021. UEC, 2022 Groundwater Monitoring Report – November 2022, Work Plan OBD-02, West Winds Truck Stop, 1085 East Main Street, Green River, Utah, Facility ID #5000275, Release Site OBD: Underwood Environmental Consulting, Inc., Park City, Utah, November 18, 2022. Groundwater Monitoring Report - March 2024 West Winds Truck Stop 1085 East Main St., Green River, UT Facility ID #5000275, Release Site OBD TABLE 1 FREE PRODUCT CHECK RECORD Depth to Free Product Depth to Free Product Well Number Date Water Thickness FP Appearance Comment Well Number Date Water Thickness FP Appearance Comment(ft)(ft)(ft)(ft) MW-2 11/3/2021 8.20 MW-7 11/3/2021 6.38 0.03 lt. yellow MW-2 4/6/2022 8.82 MW-7 4/6/2022 7.24 0.87 lt. yellow MW-2 5/9/2022 8.35 HC odor MW-7 5/9/2022 8.13 1.41 lt. yellow MW-2 6/21/2022 8.27 MW-7 6/21/2022 8.10 1.52 lt. yellow MW-2 7/18/2022 8.39 MW-7 7/18/2022 8.16 1.66 lt. yellow MW-2 8/15/2022 8.32 MW-7 8/15/2022 8.54 1.72 MW-2 9/13/2022 8.65 MW-7 9/13/2022 9.52 2.41 lt. yellow MW-2 10/21/2022 NG MW-7 10/21/2022 9.75 2.47 lt. yellow Sampled MW-2 11/7/2022 8.30 MW-7 11/7/2022 8.66 1.78 MW-2 12/8/2022 NG MW-7 12/8/2022 9.67 2.52 lt. yellow MW-2 1/30/2023 NG MW-7 1/30/2023 10.30 3.07 lt. yellow MW-2 2/11/2023 8.47 MW-7 2/11/2023 10.40 3.18 MW-2 6/22/2023 7.59 Strong HC Odor MW-7 6/22/2023 7.88 2.06 lt. yellow MW-2 9/16/2023 8.73 MW-7 9/16/2023 9.45 2.35 lt. yellow MW-2 12/13/2024 7.80 MW-7 12/13/2024 7.98 1.46 lt. yellow MW-2 3/16/2024 8.82 Strong HC Odor MW-7 3/16/2024 10.76 3.43 lt. yellow MW-6 11/3/2021 6.14 MW-SE 11/3/2021 8.34 1.4 dk. amber MW-6 4/6/2022 7.56 0.04 lt. yellow (?)MW-SE 4/6/2022 7.51 0.35 dk. amber MW-6 5/9/2022 6.87 0.01 lt. yellow (?)MW-SE 5/9/2022 8.12 0.86 dk. amber MW-6 6/21/2022 6.80 0.00 MW-SE 6/21/2022 9.30 2.31 dk. amber MW-6 7/18/2022 6.74 0.00 MW-SE 7/18/2022 9.92 3.14 dk. amber MW-6 8/15/2022 7.06 sheen lt. yellow MW-SE 8/15/2022 10.67 3.74 MW-6 9/13/2022 7.42 0.01 lt. yellow MW-SE 9/13/2022 11.40 4.18 dk. amber MW-6 10/21/2022 7.62 0.01 lt. yellow MW-SE 10/21/2022 11.74 4.38 dk. amber Sampled MW-6 11/7/2022 7.07 0.00 MW-SE 11/7/2022 11.08 4.15 MW-6 12/8/2022 7.46 0.02 MW-SE 12/8/2022 11.65 4.44 dk. amber MW-6 1/30/2023 7.52 trace MW-SE 1/30/2023 11.85 4.55 dk. amber MW-6 2/11/2023 7.61 0.01 lt. yellow MW-SE 2/11/2023 11.92 4.61 MW-6 6/22/2023 NG NG Well Damaged MW-SE 6/22/2023 7.80 1.36 dk. amber MW-6 9/16/2023 7.87 trace lt. yellow MW-SE 9/16/2023 11.41 4.14 dk. amber MW-6 12/13/2024 6.50 trace lt. yellow MW-SE 12/13/2024 8.51 1.67 dk. amber MW-6 3/16/2024 7.80 0.01 lt. yellow MW-SE 3/16/2024 12.42 4.98 Notes: ft = feet HC = hydrocarbon NG = Not Gauged FP = Free Product Underwood Environmental Consulting, Inc. Groundwater Monitoring Report - March 2024 West Winds Truck Stop 1085 East Main St., Green River, UT Facility ID 5000275, Release Site OBD WELL/DATE DTW FPT GW Elev.MTBE Benzene Toluene Ethyl- benzene Xylenes Naphth- alene TPH (GRO) TPH (DRO)ELEV.(feet)(feet)(feet)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L) MW-NW 11/03/21 7.14 92.40 99.54 05/10/22 7.73 91.81 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 08/16/22 8.00 91.54 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 11/08/22 7.88 91.66 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 02/12/23 8.26 91.28 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 09/17/23 8.31 91.23 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 03/17/24 8.48 91.06 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 MW-NE 11/03/21 6.33 92.86 99.19 05/10/22 7.15 92.04 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 08/16/22 7.40 91.79 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 11/08/22 7.37 91.82 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 02/12/23 7.89 91.30 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 09/17/23 7.73 91.46 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 03/17/24 8.06 91.13 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 MW-SW 11/04/21 7.30 92.02 <0.005 <0.005 <0.012 <0.012 <0.012 0.013 <0.125 <1.0 99.32 05/10/22 7.76 91.56 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 08/16/22 7.83 91.49 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 11/08/22 7.84 91.48 <0.005 0.012 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 02/12/23 8.20 91.12 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 09/17/23 8.24 91.08 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 03/17/24 8.43 90.89 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 MW-SE 11/03/21 8.34 1.4 91.93 99.08 05/10/22 8.12 0.86 91.69 08/15/22 10.67 3.74 91.59 11/07/22 11.08 4.15 91.53 02/11/23 11.92 4.61 91.08 09/16/23 11.41 4.14 91.19 03/16/24 12.42 4.98 90.89 Initial Screening Levels (1)0.2 0.005 1 0.7 10 0.7 1 1 Tier 1 Screening Criteria (1)0.2 0.3 3 4 10 0.7 10 10 continued next page Not Sampled Not Sampled Not Sampled Not Sampled Not Sampled Not Sampled TABLE 2 GROUNDWATER MONITORING DATA Not Sampled Not Sampled Not Sampled Underwood Environmental Consulting, Inc. Groundwater Monitoring Report - March 2024 West Winds Truck Stop 1085 East Main St., Green River, UT Facility ID 5000275, Release Site OBD WELL/DATE DTW FPT GW Elev.MTBE Benzene Toluene Ethyl- benzene Xylenes Naphth- alene TPH (GRO) TPH (DRO)ELEV.(feet)(feet)(feet)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L) TABLE 2 GROUNDWATER MONITORING DATA MW-1 11/03/21 8.70 91.30 <0.005 0.013 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 100.00 05/10/22 8.81 91.19 <0.005 0.029 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 08/15/22 8.90 91.10 <0.005 0.056 <0.012 <0.012 0.013 <0.012 <0.125 <1.0 11/07/22 8.86 91.14 <0.005 0.008 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 02/11/23 8.91 91.09 <0.005 0.008 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 09/16/23 9.32 90.68 <0.050 10.3 0.536 2.13 2.32 0.242 17.8 2.7 03/17/24 9.24 90.76 <0.005 0.141 <0.012 <0.012 0.115 0.027 0.657 <1.0 MW-2 11/03/21 8.20 91.29 <0.005 0.128 0.076 0.074 0.226 0.019 1.38 <1.0 99.49 05/10/22 8.35 91.14 <0.005 0.064 <0.012 <0.012 0.014 <0.012 <0.125 <1.0 08/15/22 8.32 91.17 <0.005 0.108 <0.012 0.030 0.032 <0.012 0.364 <1.0 11/07/22 8.30 91.19 <0.005 0.060 <0.012 <0.012 0.020 <0.012 <0.125 <1.0 02/11/23 8.47 91.02 <0.005 9.58 0.012 0.016 0.095 <0.012 9.69 1.3 09/16/23 8.73 90.76 <0.005 4.77 0.027 0.028 1.83 0.016 6.90 3.8 03/17/24 8.82 90.67 <0.005 3.02 0.028 0.927 1.07 0.290 7.45 5.8 MW-3 11/03/21 7.89 91.38 <0.005 0.025 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 99.27 05/10/22 8.07 91.20 <0.005 0.034 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 08/15/22 8.02 91.25 <0.005 0.021 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 11/07/22 8.07 91.20 <0.005 0.007 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 02/11/23 8.31 90.96 <0.005 0.006 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 09/16/23 8.51 90.76 <0.005 0.106 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 03/17/24 8.65 90.62 <0.005 0.013 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 MW-4 11/03/21 8.64 90.79 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 99.43 05/10/22 8.80 90.63 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 08/15/22 8.39 91.04 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 11/07/22 8.64 90.79 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 02/11/23 8.81 90.62 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 09/16/23 9.07 90.36 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 03/17/24 9.14 90.29 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 Initial Screening Levels (1)0.2 0.005 1 0.7 10 0.7 1 1 Tier 1 Screening Criteria (1)0.2 0.3 3 4 10 0.7 10 10 continued next page Underwood Environmental Consulting, Inc. Groundwater Monitoring Report - March 2024 West Winds Truck Stop 1085 East Main St., Green River, UT Facility ID 5000275, Release Site OBD WELL/DATE DTW FPT GW Elev.MTBE Benzene Toluene Ethyl- benzene Xylenes Naphth- alene TPH (GRO) TPH (DRO)ELEV.(feet)(feet)(feet)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L) TABLE 2 GROUNDWATER MONITORING DATA MW-5 11/03/21 7.00 91.99 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 98.99 05/10/22 7.46 91.53 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 08/15/22 7.48 91.51 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 11/08/22 7.58 91.41 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 02/11/23 7.98 91.01 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 09/16/23 7.95 91.04 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 03/17/24 8.2 90.79 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 MW-6 11/04/21 6.14 92.64 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 <1.0 98.78 05/10/22 6.87 0.01 91.92 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 5.0 08/16/22 7.06 sheen 91.72 <0.005 <0.005 <0.012 <0.012 <0.012 0.027 0.852 159 11/08/22 7.07 0.00 91.71 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 1.5 02/12/23 7.61 0.01 91.18 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 13.6 09/16/23 7.87 trace 90.91 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 4.7 03/17/24 7.80 0.01 90.99 <0.005 <0.005 <0.012 <0.012 <0.012 <0.012 <0.125 1.9 MW-7 11/04/21 6.38 0.03 92.46 <0.005 <0.005 <0.012 0.040 0.078 0.084 2.15 31.8 98.81 05/10/22 8.13 1.41 91.88 08/15/22 8.54 1.72 91.73 11/07/22 8.66 1.78 91.66 02/11/23 10.40 3.18 91.11 09/16/23 9.45 2.35 91.36 03/16/24 10.76 3.43 90.97 Initial Screening Levels (1)0.2 0.005 1 0.7 10 0.7 1 1 Tier 1 Screening Criteria (1)0.2 0.3 3 4 10 0.7 10 10 Notes:Arbitrary datum of 100.00 feet established on site.MTBE = Methyl Tertiary Butyl Ether DTW = Depth to Water TPH (GRO) = Total Petroleum Hydrocarbons - Gasoline Range Organics FPT = Free Product Thickness TPH (DRO) = Total Petroleum Hydrocarbons - Diesel Range Organics GW Elev. = Groundwater Elevation < Indicates below given detection limit. GW Elev. Correction = (Well Elev.-DTW)+(0.85*FPT).Bold values are above Initial Screening Levels. (1) DERR, 2005 Highlighted,bold , values are above Tier 1 Screening Criteria. Not Sampled Not Sampled Not Sampled Not Sampled Not Sampled Not Sampled Underwood Environmental Consulting, Inc. LEGEND Approx. Scale one inch ~ 75 feet 00 75 NORTH West Winds Truck Stop 1085 E. Main St. Green River, Utah Facility ID #5000275 Release Site OBD S S S SD SD W W W W ? ? FH C P P OH P USTs Water LineW S (Utility Locations Approximate) SD Storm Drain Communications PowerPOHP C Sanitary Sewer Main S t r e e t Sidewa l k C-Store Repair Shop Sc a l e Di t c h Overflow Parking Tire Storage Retail Dispens e r s Commercial Dispensers filled in place UL UL D asp h a l t con c r e t e Canopy Canopy Restaurant Field Dominion Energy Pipeline Facility FIGURE 1 GROUNDWATER CONTOUR MAP MARCH 16, 2024 4/3/24 2-Inch Monitoring Well MW-1 4-Inch Monitoring Well MW-NE 90.76 Groundwater Elev. (ft) 9 1 Groundwater Contour Line (contour interval = 0.3 ft) Groundwater Flow Direction Groundwater Elevations Corrected for Presence of Free Product 2.35 Free Product Thickness (ft) MW-2 MW-3 MW-4 MW-1 MW-6 MW-7 MW-5 MW-NE MW-NW MW-SW MW-SE 3.43 4.98 L ICENS E D P R O FESSIO N A L G E OLOGIST L ICENS E D P R O FESSIO N A L G E OLOGIST JAM E S A . McR E E L JAM E S A . McR E E L 5420 8 5 4 - 2 2 5 0 91.06 91.13 90.89 90.89 90.76 90.67 90.62 90.29 90.79 90.99 90.97 The analyses presented on this report were performed in accordance with the National Environmental Laboratory Accreditation Program (NELAP) unless noted in the comments, flags, or case narrative. If the report is to be used for regulatory compliance, it should be presented in its entirety, and not be altered. Client Service Contact: 801.262.7299 Underwood Environmental Consulting Attn: James McReel 9475 North Silver Creek Road Park City, UT 84098 Work Order: 24C1167 Project: West Winds Truck Stop 3/25/2024 Approved By: Mark Broadhead, Project Manager 9632 South 500 West Sandy, Utah 84070 Serving the Intermountain West since 1953 801.262.7299 Main 866.792.0093 Fax www.ChemtechFord.com Page 1 of 12 xx Chemtech-Ford Laboratories Serving the Intermountain West Since 1953 Certificate of Analysis 9632 South 500 West Sandy, UT 84070 O:(801) 262-7299 F: (866) 792-0093 www.ChemtechFord.com Underwood Environmental Consulting James McReel 9475 North Silver Creek Road Park City, UT 84098 PO#: Receipt: Date Reported: Project Name: OBD-03 3/18/24 13:06 @ 0.1 °C 3/25/2024 West Winds Truck Stop Sample ID: MW-NW Lab ID: 24C1167-01Matrix: Water Flag(s)Units Analysis Date/Time Date Sampled: 3/17/24 11:45 Preparation Date/Time Sampled By: James McReel Minimum Reporting Limit MethodResult MBTEXn mg/L 3/19/243/19/240.005 EPA 8260D/5030BNDBenzene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDEthylbenzene mg/L J-LOW-C3/19/243/19/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE) mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDNaphthalene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDToluene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDXylenes, total Gasoline Range mg/L 3/19/243/19/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics Diesel Range mg/L 3/22/243/22/241.0 EPA 8015 CNDDiesel Range Organics Project Name: West Winds Truck Stop CtF WO#: 24C1167 www.ChemtechFord.com Page 2 of 12Page 2 of 12 xx Chemtech-Ford Laboratories Serving the Intermountain West Since 1953 Certificate of Analysis 9632 South 500 West Sandy, UT 84070 O:(801) 262-7299 F: (866) 792-0093 www.ChemtechFord.com Underwood Environmental Consulting James McReel 9475 North Silver Creek Road Park City, UT 84098 PO#: Receipt: Date Reported: Project Name: OBD-03 3/18/24 13:06 @ 0.1 °C 3/25/2024 West Winds Truck Stop Sample ID: MW-SW Lab ID: 24C1167-02Matrix: Water Flag(s)Units Analysis Date/Time Date Sampled: 3/17/24 12:30 Preparation Date/Time Sampled By: James McReel Minimum Reporting Limit MethodResult MBTEXn mg/L 3/19/243/19/240.005 EPA 8260D/5030BNDBenzene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDEthylbenzene mg/L J-LOW-C3/19/243/19/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE) mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDNaphthalene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDToluene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDXylenes, total Gasoline Range mg/L 3/19/243/19/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics Diesel Range mg/L 3/22/243/22/241.0 EPA 8015 CNDDiesel Range Organics Project Name: West Winds Truck Stop CtF WO#: 24C1167 www.ChemtechFord.com Page 3 of 12Page 3 of 12 xx Chemtech-Ford Laboratories Serving the Intermountain West Since 1953 Certificate of Analysis 9632 South 500 West Sandy, UT 84070 O:(801) 262-7299 F: (866) 792-0093 www.ChemtechFord.com Underwood Environmental Consulting James McReel 9475 North Silver Creek Road Park City, UT 84098 PO#: Receipt: Date Reported: Project Name: OBD-03 3/18/24 13:06 @ 0.1 °C 3/25/2024 West Winds Truck Stop Sample ID: MW-NE Lab ID: 24C1167-03Matrix: Water Flag(s)Units Analysis Date/Time Date Sampled: 3/17/24 13:00 Preparation Date/Time Sampled By: James McReel Minimum Reporting Limit MethodResult MBTEXn mg/L 3/19/243/19/240.005 EPA 8260D/5030BNDBenzene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDEthylbenzene mg/L J-LOW-C3/19/243/19/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE) mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDNaphthalene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDToluene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDXylenes, total Gasoline Range mg/L 3/19/243/19/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics Diesel Range mg/L 3/22/243/22/241.0 EPA 8015 CNDDiesel Range Organics Project Name: West Winds Truck Stop CtF WO#: 24C1167 www.ChemtechFord.com Page 4 of 12Page 4 of 12 xx Chemtech-Ford Laboratories Serving the Intermountain West Since 1953 Certificate of Analysis 9632 South 500 West Sandy, UT 84070 O:(801) 262-7299 F: (866) 792-0093 www.ChemtechFord.com Underwood Environmental Consulting James McReel 9475 North Silver Creek Road Park City, UT 84098 PO#: Receipt: Date Reported: Project Name: OBD-03 3/18/24 13:06 @ 0.1 °C 3/25/2024 West Winds Truck Stop Sample ID: MW-4 Lab ID: 24C1167-04Matrix: Water Flag(s)Units Analysis Date/Time Date Sampled: 3/17/24 13:45 Preparation Date/Time Sampled By: James McReel Minimum Reporting Limit MethodResult MBTEXn mg/L 3/19/243/19/240.005 EPA 8260D/5030BNDBenzene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDEthylbenzene mg/L J-LOW-C3/19/243/19/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE) mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDNaphthalene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDToluene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDXylenes, total Gasoline Range mg/L 3/19/243/19/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics Diesel Range mg/L 3/22/243/22/241.0 EPA 8015 CNDDiesel Range Organics Project Name: West Winds Truck Stop CtF WO#: 24C1167 www.ChemtechFord.com Page 5 of 12Page 5 of 12 xx Chemtech-Ford Laboratories Serving the Intermountain West Since 1953 Certificate of Analysis 9632 South 500 West Sandy, UT 84070 O:(801) 262-7299 F: (866) 792-0093 www.ChemtechFord.com Underwood Environmental Consulting James McReel 9475 North Silver Creek Road Park City, UT 84098 PO#: Receipt: Date Reported: Project Name: OBD-03 3/18/24 13:06 @ 0.1 °C 3/25/2024 West Winds Truck Stop Sample ID: MW-5 Lab ID: 24C1167-05Matrix: Water Flag(s)Units Analysis Date/Time Date Sampled: 3/17/24 14:30 Preparation Date/Time Sampled By: James McReel Minimum Reporting Limit MethodResult MBTEXn mg/L 3/19/243/19/240.005 EPA 8260D/5030BNDBenzene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDEthylbenzene mg/L J-LOW-C3/19/243/19/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE) mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDNaphthalene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDToluene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDXylenes, total Gasoline Range mg/L 3/19/243/19/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics Diesel Range mg/L 3/22/243/22/241.0 EPA 8015 CNDDiesel Range Organics Project Name: West Winds Truck Stop CtF WO#: 24C1167 www.ChemtechFord.com Page 6 of 12Page 6 of 12 xx Chemtech-Ford Laboratories Serving the Intermountain West Since 1953 Certificate of Analysis 9632 South 500 West Sandy, UT 84070 O:(801) 262-7299 F: (866) 792-0093 www.ChemtechFord.com Underwood Environmental Consulting James McReel 9475 North Silver Creek Road Park City, UT 84098 PO#: Receipt: Date Reported: Project Name: OBD-03 3/18/24 13:06 @ 0.1 °C 3/25/2024 West Winds Truck Stop Sample ID: MW-1 Lab ID: 24C1167-06Matrix: Water Flag(s)Units Analysis Date/Time Date Sampled: 3/17/24 15:00 Preparation Date/Time Sampled By: James McReel Minimum Reporting Limit MethodResult MBTEXn mg/L 3/19/243/19/240.005 EPA 8260D/5030B0.141Benzene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDEthylbenzene mg/L J-LOW-C3/19/243/19/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE) mg/L 3/19/243/19/240.012 EPA 8260D/5030B0.027Naphthalene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDToluene mg/L 3/19/243/19/240.012 EPA 8260D/5030B0.115Xylenes, total Gasoline Range mg/L 3/19/243/19/240.125 EPA 8260B/C /5030A/[CALC]0.657Gasoline Range Organics Diesel Range mg/L 3/22/243/22/241.0 EPA 8015 CNDDiesel Range Organics Project Name: West Winds Truck Stop CtF WO#: 24C1167 www.ChemtechFord.com Page 7 of 12Page 7 of 12 xx Chemtech-Ford Laboratories Serving the Intermountain West Since 1953 Certificate of Analysis 9632 South 500 West Sandy, UT 84070 O:(801) 262-7299 F: (866) 792-0093 www.ChemtechFord.com Underwood Environmental Consulting James McReel 9475 North Silver Creek Road Park City, UT 84098 PO#: Receipt: Date Reported: Project Name: OBD-03 3/18/24 13:06 @ 0.1 °C 3/25/2024 West Winds Truck Stop Sample ID: MW-2 Lab ID: 24C1167-07Matrix: Water Flag(s)Units Analysis Date/Time Date Sampled: 3/17/24 15:35 Preparation Date/Time Sampled By: James McReel Minimum Reporting Limit MethodResult MBTEXn mg/L 3/19/243/19/240.050 EPA 8260D/5030B3.02Benzene mg/L 3/19/243/19/240.012 EPA 8260D/5030B0.927Ethylbenzene mg/L J-LOW-C3/19/243/19/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE) mg/L 3/19/243/19/240.012 EPA 8260D/5030B0.290Naphthalene mg/L 3/19/243/19/240.012 EPA 8260D/5030B0.028Toluene mg/L 3/19/243/19/240.012 EPA 8260D/5030B1.07Xylenes, total Gasoline Range mg/L 3/19/243/19/240.125 EPA 8260B/C /5030A/[CALC]7.45Gasoline Range Organics Diesel Range mg/L 3/22/243/22/241.0 EPA 8015 C5.8Diesel Range Organics Project Name: West Winds Truck Stop CtF WO#: 24C1167 www.ChemtechFord.com Page 8 of 12Page 8 of 12 xx Chemtech-Ford Laboratories Serving the Intermountain West Since 1953 Certificate of Analysis 9632 South 500 West Sandy, UT 84070 O:(801) 262-7299 F: (866) 792-0093 www.ChemtechFord.com Underwood Environmental Consulting James McReel 9475 North Silver Creek Road Park City, UT 84098 PO#: Receipt: Date Reported: Project Name: OBD-03 3/18/24 13:06 @ 0.1 °C 3/25/2024 West Winds Truck Stop Sample ID: MW-3 Lab ID: 24C1167-08Matrix: Water Flag(s)Units Analysis Date/Time Date Sampled: 3/17/24 16:15 Preparation Date/Time Sampled By: James McReel Minimum Reporting Limit MethodResult MBTEXn mg/L 3/19/243/19/240.005 EPA 8260D/5030B0.013Benzene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDEthylbenzene mg/L J-LOW-C3/19/243/19/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE) mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDNaphthalene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDToluene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDXylenes, total Gasoline Range mg/L 3/19/243/19/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics Diesel Range mg/L 3/22/243/22/241.0 EPA 8015 CNDDiesel Range Organics Project Name: West Winds Truck Stop CtF WO#: 24C1167 www.ChemtechFord.com Page 9 of 12Page 9 of 12 xx Chemtech-Ford Laboratories Serving the Intermountain West Since 1953 Certificate of Analysis 9632 South 500 West Sandy, UT 84070 O:(801) 262-7299 F: (866) 792-0093 www.ChemtechFord.com Underwood Environmental Consulting James McReel 9475 North Silver Creek Road Park City, UT 84098 PO#: Receipt: Date Reported: Project Name: OBD-03 3/18/24 13:06 @ 0.1 °C 3/25/2024 West Winds Truck Stop Sample ID: MW-6 Lab ID: 24C1167-09Matrix: Water Flag(s)Units Analysis Date/Time Date Sampled: 3/17/24 16:50 Preparation Date/Time Sampled By: James McReel Minimum Reporting Limit MethodResult MBTEXn mg/L 3/19/243/19/240.005 EPA 8260D/5030BNDBenzene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDEthylbenzene mg/L J-LOW-C3/19/243/19/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE) mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDNaphthalene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDToluene mg/L 3/19/243/19/240.012 EPA 8260D/5030BNDXylenes, total Gasoline Range mg/L 3/19/243/19/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics Diesel Range mg/L 3/22/243/22/241.0 EPA 8015 C1.9Diesel Range Organics Project Name: West Winds Truck Stop CtF WO#: 24C1167 www.ChemtechFord.com Page 10 of 12Page 10 of 12 xx Chemtech-Ford Laboratories Serving the Intermountain West Since 1953 Certificate of Analysis 9632 South 500 West Sandy, UT 84070 O:(801) 262-7299 F: (866) 792-0093 www.ChemtechFord.com Underwood Environmental Consulting James McReel 9475 North Silver Creek Road Park City, UT 84098 PO#: Receipt: Date Reported: Project Name: OBD-03 3/18/24 13:06 @ 0.1 °C 3/25/2024 West Winds Truck Stop Report Footnotes Abbreviations ND = Not detected at the corresponding Minimum Reporting Limit (MRL). 1 mg/L = one milligram per liter or 1 mg/kg = one milligram per kilogram = 1 part per million. 1 ug/L = one microgram per liter or 1 ug/kg = one microgram per kilogram = 1 part per billion. 1 ng/L = one nanogram per liter or 1 ng/kg = one nanogram per kilogram = 1 part per trillion. On calculated parameters, there may be a slight difference between summing the rounded values shown on the report vs the unrounded values used in the calculation. Flag Descriptions J-LOW-C = Estimated low due to low recovery of CCV Project Name: West Winds Truck Stop CtF WO#: 24C1167 www.ChemtechFord.com Page 11 of 12Page 11 of 12 Page 12 of 12