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Final Annual Monitoring Report 2024 Groundwater Monitoring and Slurry Wall/Cap Inspection Enbridge Gas Utah Project number: 60736618 February 5, 2025 Updated February 12, 2025 Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM Prepared for: Enbridge Gas Utah Prepared by: AECOM 756 East Winchester Street Suite 400 Salt Lake City, UT 84107 aecom.com Copyright © 2025 by AECOM All rights reserved. No part of this copyrighted work may be reproduced, distributed, or transmitted in any form or by any means without the prior written permission of AECOM. Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM Table of Contents 1. Introduction .............................................................................................. 2 1.1 Site History .................................................................................................................. 2 1.2 Objective ..................................................................................................................... 3 2. Annual Groundwater Monitoring .............................................................. 4 2.1 Monitoring Well Installation ......................................................................................... 4 2.1.1 Completion Replacement .......................................................................... 4 2.1.2 Well Development ...................................................................................... 4 2.1.3 Well and Piezometer Survey ..................................................................... 5 2.2 Groundwater Monitoring .............................................................................................. 5 2.2.1 Groundwater Level Measurements ............................................................ 5 2.2.2 Groundwater Sampling .............................................................................. 5 2.2.3 Investigation-Derived Waste ...................................................................... 6 2.2.4 Analytical Results ...................................................................................... 6 3. Slurry Wall and Surface Cap Inspection .................................................. 7 3.1 Slurry Wall ................................................................................................................... 7 3.2 Surface Cap ................................................................................................................ 8 4. Conclusions and Recommendations ....................................................... 9 5. References ............................................................................................ 10 Figures Figure 1 Project Location Map Figure 2 Potentiometric Surface Map Tables Table 1 Groundwater Sampling Field Parameters Table 2 Groundwater Analytical Results Appendices Appendix A Field Forms Appendix B Slurry Wall and Cap Inspection Forms Appendix C Analytical Report Appendix D Boring Logs Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM 1 Acronyms AECOM AECOM Technical Services bgs below ground surface CGR coal gasification residuals EGU Enbridge Gas Utah ft/ft feet per foot IDW investigation-derived waste MCL maximum contaminant level µg/L micrograms per Liter OMM Operation and Maintenance Manual ORP oxidation reduction potential PAH polycyclic aromatic hydrocarbons PID photoionization detector pH potential of hydrogen QA quality assurance QC quality control RAP Revised Remedial Action Plan (RAP) SVOC semi volatile organic compound SWP slurry wall piezometers UDEQ Utah Department of Environmental Quality VOC volatile organic compound Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM 2 1. Introduction AECOM Technical Services, Inc. (AECOM) was tasked by Enbridge Gas Utah (EGU) to implement the updated Operation and Maintenance Manual (OMM) for the Salt Lake Operational Center North project. The Salt Lake Operations Center (Operations Center) is located at 1140 West 200 South in Salt Lake City, Utah. The former Utah Gas & Coke Company property which produced synthetic gas by coal gasification between 1908 and 1929 (Dames & Moore, 1988) was located in the northeast portion of the operations center, near 1000 West 100 South, and is referred to as the North Operations Facility (the site) in the historical documents related to this project. The project location is shown on Figure 1. 1.1 Site History In 1983, coal gasification residuals (CGR) were discovered at the site. The subsequent Phase I Preliminary and Phase II Confirmatory Investigations identified polycyclic aromatic hydrocarbons (PAHs) and volatile organic compounds (VOCs) in site soils and PAHs, VOCs, and phenolic compounds in site groundwater (Dames & Moore, 1986). CGR was found on site, both above and within the water table. Off-site, CGR was found within the water table and contaminant migration was noted to be primarily toward the south (Dames & Moore, 1988). The initial remedy implemented in 1989 included the construction of a slurry wall around the site and surrounding area, followed by the installation of a groundwater extraction system designed to maintain an inward hydraulic gradient within the slurry wall and to limit further migration of impacted groundwater off-site. The area within the slurry wall is paved with asphalt or concrete, or covered with buildings, except for some landscaped areas in the southern part of the site along 100 South Street. This developed area serves as a low permeability cap (surface cap) to minimize surface water infiltration, which can reduce mobility of the CGR source beneath the Site. Additional site background can be found in the Revised Remedial Action Plan (RAP) (Dominion, 2024a). The current remedy as presented in the RAP (Dominion, 2024a) consists of hydraulic containment without groundwater extraction. Onsite CGR impacts are contained by the slurry wall, which is functioning as intended as a low permeability barrier. The existing groundwater extraction system has been shut down since 2017 and has been determined to be unnecessary to maintain hydraulic control and inward gradient within the slurry wall to contain CGR (UDEQ, 2023). Hydraulic containment will continue to be achieved via the existing slurry wall and maintenance of the surface cap. Effectiveness of the remedy will be evaluated by scheduled visual inspections, measuring water levels inside and outside of the slurry wall, and by collection of groundwater samples for laboratory analysis as detailed in the revised OMM (Dominion, 2024b). The historical groundwater monitoring program has been conducted on a semi-annual basis. Due to the amount of historical data, age of the source material, and acceptable off-site risks, the Revised RAP specifies an annual sampling and reporting frequency (Dominion, 2024a). Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM 3 1.2 Objective The annual groundwater monitoring program presented in the RAP and OMM is based on 30 plus years of semi-annual sampling events between 1992 and 2023, which demonstrate that groundwater impacts beneath the site are well understood, delineated, and are not migrating. The monitoring described herein is based on the recommendations presented in the Soil Gas and Groundwater Investigation Summary Report (AECOM, 2022) and approved by the Utah Department of Environmental Quality (UDEQ) on January 5, 2023 (UDEQ, 2023). This report summarizes and presents the results of the 2024 groundwater monitoring and inspection event conducted at the North Operations Facility in October and December 2024. Field activities were conducted in accordance with the Revised RAP (Dominion, 2024a), OMM (Dominion, 2024b), and the site-specific Health and Safety Plans developed by EGU (Dominion, 2017) and AECOM (2021). Field forms are provided in Appendix A, inspection forms are included in Appendix B, and the laboratory analytical report is included in Appendix C. In addition to the annual monitoring and inspection activities, this first annual monitoring report also describes the initial installation and completion of three monitoring wells and three piezometers in order to establish a viable well and piezometer network. Boring Logs are provided in Appendix D. Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM 4 2. Annual Groundwater Monitoring 2.1 Monitoring Well Installation As part of the 2024 field activities, AECOM installed three shallow 2-inch monitoring wells (MW-101, MW-102, and MW-103) and three 1-inch piezometers (PZ-1, PZ-2, and PZ-3) in accordance with the OMM (Dominion, 2024b). Wells were installed to an approximate depth of 15-20 feet below ground surface (bgs). These are generally located within Salt Lake City Corporation rights-of-way and streets. Groundwater wells and piezometers are depicted on Figure 2. Boring logs are provided in Appendix D. A public right-of-way permit was obtained from Salt Lake City by the driller prior to starting the work. AECOM developed a traffic control plan that was included in the permit. Underground utilities were cleared at each location through Blue Stakes of Utah and Earthview, a private utility contractor. In addition, Enbridge Gas Utah marked known private utilities on their property. Each well and piezometer location was daylighted to approximate five feet bgs by hydrovac. Wells were installed using direct-push technologies by Pacific West, a licensed Utah driller. Wells and piezometers were installed using 3.75-inch direct-push rods. The total depth of wells was based on the depth to the confining layer at each location as interpreted by the field geologist. Soil cores were field screen with a photoionization detector (PID). 2.1.1 Completion Replacement Surface completions were replaced at six locations (slurry wall piezometer [SWP]-3, SWP-4, SWP-5, SWP-6, M-10 and MW-12). 2.1.2 Well Development AECOM developed the six wells and nine piezometers associated with the site (MW-101, MW-102, MW-103, SW-1, M-10, MW-12, PZ-1, PZ-2, PZ-3, SWP-1, SWP-2, SWP-3, SWP-4, SWP-5, and SWP-6). See Figure 2. Wells and piezometers were redeveloped using a submersible pump for the 2-inch diameter wells and a foot valve pump for the 1-inch diameter piezometers. Purge water from well development was containerized, profiled, and properly disposed of by Enbridge Gas Utah. A well development form was completed for each location and is provided in Appendix A. Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM 5 2.1.3 Well and Piezometer Survey The top of casing and ground surface for each well (MW-101, MW-102, MW-103, SW-1, M-10, MW-12, PZ-1, PZ-2, PZ-3, SWP-1, SWP-2, SWP-3, SWP-4, SWP-5, and SWP-6) were topographically surveyed by Region Engineering and Surveying, a Utah Licensed surveyor. The ground surface and top of casing for each well was surveyed to within +0.01 feet using the National Geodetic Vertical Datum of 1988. Horizontal coordinates were determined to within +0.1 feet and reported in Utah State Plane coordinates, North American Datum 83, US survey feet. 2.2 Groundwater Monitoring The groundwater monitoring network is being assessed annually to confirm ongoing plume stability and natural attenuation of the groundwater plume. Three of the wells are located within the groundwater plume (source wells) and monitor natural attenuation of the plume. Three of the monitoring wells are downgradient of the plume (sentry wells) and will verify that plume migration is not occurring. Recommendations will be presented in Section 4 if deficiencies are identified. 2.2.1 Groundwater Level Measurements During the annual groundwater monitoring event, depth to groundwater was measured with an electronic dual interface probe at six monitoring wells and nine piezometers prior to groundwater sampling activities. Depth to water measurements were recorded on the Water Level Form included in Appendix A. Depth to groundwater measurements were used in conjunction with the surveyed elevations of the top of each well or piezometer casing to calculate groundwater elevations above mean sea level (Table 1). A potentiometric surface map was generated for the areas upgradient of the site, inside the slurry wall, and downgradient of the site (Figure 2). Based on the depth to water measurements collected on December 2, 2024, groundwater appears to flow to the northeast within the slurry wall, and to the southeast outside of the slurry wall. The potentiometric surface contour map was prepared using the Surfer® version 27.1.229 contouring package, followed by manual interpretive editing and smoothing. The slurry wall piezometers were not used in generation of the potentiometric surface map. The contouring package takes the point data (i.e., water level elevations, well locations) and interpolates them to a regular grid using the kriging interpolators available in Surfer® to generate contours. These computer-generated contours were then manually adjusted to conform to known data points (e.g., Plant Area elevations) to reflect professional judgment in areas between data points. 2.2.2 Groundwater Sampling Groundwater was collected from the three source area wells (MW-101, MW-102, and SW-1) and three sentry wells (MW-103, MW-12, and M-10) using low stress techniques and a peristaltic pump. Each monitoring well was purged at a rate less than or equal to 0.3 liters per minute until field-measured parameters stabilized before samples were collected. VOC samples were collected at a rate less than or equal to 0.1 liters per minute. The parameters of potential of hydrogen (pH), conductivity, oxidation reduction potential (ORP), and temperature were Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM 6 monitored during purging using portable calibrated meters. Parameters presented in Table 1 were measured approximately every three minutes during purging and recorded on the Groundwater Sampling Forms included in Appendix A. Groundwater samples were shipped to Pace National Laboratory located in Mt. Juliet, Tennessee, a Utah Certified Laboratory. Quality Assurance/Quality Control (QA/QC) samples included one field duplicate, and a trip blank collected for each cooler containing samples for VOC analysis. A chain of custody record was completed and accompanied every sample shipment. Data validation was not included in this scope of work. Groundwater samples were analyzed for VOCs by 8260B and for SVOCs by 8270C. SVOC analysis will be performed for eight sampling events. If SVOC detections remain below maximum contaminant levels (MCLs) for all eight sampling events, discontinuation of SVOC analysis will be assessed and discussed with UDEQ. The December 2024 sampling event marks the first of the eight sampling events. 2.2.3 Investigation-Derived Waste Investigation-derived waste (IDW) consisted of water used to decontaminate sampling equipment, purge water from monitoring well sampling, and soil cuttings from well installation. IDW was containerized by AECOM and properly profiled and disposed of by Enbridge Gas Utah. Other wastes such as used tubing, personal protective equipment, packaging materials, and general refuse were disposed of in an on-site municipal waste dumpster. 2.2.4 Analytical Results Table 2 summarizes the groundwater analytical results for this December 2024 sampling event. Benzene exceeded the MCL of 5 micrograms per liter [µg/L] in groundwater from all three source wells; MW-101 (103 µg/L), MW-102 (53.2 µg/L), and SW-1 (12.2 µg/L). No other MCLs were exceeded for any analytes in groundwater sampled from the source or sentry wells. MCLs were not exceeded for any SVOC constituents. The full laboratory analytical report is provided in Appendix C. Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM 7 3. Slurry Wall and Surface Cap Inspection 3.1 Slurry Wall The slurry wall encompasses an approximately nine-acre area totaling approximately 2,400 feet with a minimum width of approximately two feet, a depth of approximately 21-26 feet bgs, and is keyed into underlying clay a minimum of three feet. Six paired piezometers (SWP-1 through SWP- 6) are located on either side of the north, west, and south sides of the slurry wall and are used to monitor the differential in water elevations between the inside and outside of the slurry wall. As discussed in Section 2.2.1, groundwater appears to flow to the northeast within the slurry wall, and to the southeast outside of the slurry wall. The approximate location of the slurry wall and groundwater contours are shown on Figure 2. On December 3, 2024, AECOM conducted a visual inspection of the slurry wall to look for obvious areas of encroachment, damage, or penetration to ensure continued integrity to the extent possible, in accordance with the OMM. The Slurry Wall Inspection Form is included in Appendix B. The potentiometric surface contour map was used to estimate the horizontal gradient beneath the site inside and outside the slurry wall in December 2024: • The approximate average horizontal hydraulic gradient inside the slurry wall is 0.0007 feet per foot (ft/ft) toward the northeast (60°NE). • The approximate average horizontal hydraulic gradient outside the slurry wall is 0.003 ft/ft towards the southeast (140°SW). • The approximate horizontal hydraulic gradient across the slurry wall between SWP-1 and SWP-2 is 0.031 ft/ft towards the south (inward). The assumed distance between SWP-1 and SWP-2 used in the calculation was 15 feet. • The approximate horizontal hydraulic gradient across the slurry wall between SWP-3 and SWP-4 is 0.037 ft/ft towards the east (inward). The assumed distance between SWP3 and SWP-4 used in the calculation was 29 feet. • The approximate horizontal hydraulic across the slurry wall between SWP-5 and SWP-6 is 0.105 ft/ft towards the east (outward). The assumed distance between SWP5 and SWP-6 used in the calculation was 12 feet. The average horizontal hydraulic gradient in 1987 (prior to the slurry wall construction) was approximately 0.003 ft/ft towards the southeast. In December 2024, the average hydraulic gradient outside the slurry wall was 0.003 ft/ft and the average hydraulic gradient inside the slurry wall was 0.0007 ft/ft. There is an order of magnitude difference between the hydraulic gradients inside and outside the slurry wall in December 2024. Additionally, there is an order of magnitude Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM 8 difference between the 1987 average gradient for the site and the average hydraulic gradient inside the slurry wall. This order of magnitude difference in horizontal gradient between pre-slurry wall construction and post-slurry wall construction (inside gradients) suggests that the slurry wall is functioning as a low permeability barrier, significantly limiting the migration of CGR from the site. 3.2 Surface Cap AECOM conducted an inspection of the existing asphalt/concrete surface cap on December 3, 2024, in accordance with the OMM. No unsealed surface cracks or subsidence/settlement of the pavement was observed. Small areas which are grass-covered, such as parking lot medians and the lawn along 100 South Street, are anticipated to have an insignificant contribution to infiltration. Roof drains convey water to the stormwater collections system to the extent possible. The surface cap is functioning as designed and limiting infiltration of surface water to groundwater within the slurry wall area. The surface cap inspection form is included in Appendix B. Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM 9 4. Conclusions and Recommendations During the 2024 sampling event, three source wells and three downgradient wells were analyzed for VOCs and SVOCs. Analytical results of the 2024 sampling event indicate that groundwater impacts are not migrating to the downgradient wells. The slurry wall is functioning as a low permeability barrier, significantly limiting the migration of CGR from the site. The surface cap is functioning as designed, limiting infiltration of surface water to groundwater within the slurry wall area. The localized groundwater gradients across the site will continue to be used to demonstrate performance of the slurry wall. Groundwater will continue to be collected and analyzed for VOCs and SVOCs on an annual basis. If SVOC detections remain below MCLs for the next 7 sampling events, discontinuation of SVOC analysis will be assessed and discussed with UDEQ. Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM 10 5. References AECOM, 2021. Universal Health & Safety Plan, Salt Lake Operational Center North – Dominion. November 2021. AECOM, 2022. Dominion Energy Services, Inc., Salt Lake North Operations Facility, Soil Gas and Groundwater Investigation Summary Report. December 2022. Dames and Moore, 1986. Mountain Fuels Supply Company Operations Center Remedial Action Strategy (RAS). April 10, 1986. Dames and Moore, 1988. Site Investigation and Proposed Remedial Action Plan (1988 RAP). August 9, 1988. Dominion, 2017. Dominion Questar Gas Company Environmental, Health, Safety & Site Management Plan North Operations Center Salt Lake City, Utah. May 2017. Dominion, 2024a. Questar Gas Company Salt Lake North Operations Facility, Revised Remedial Action Plan (RAP). Revised March 2024. Dominion, 2024b. Questar Gas Company Salt Lake North Operations Facility, Operation and Maintenance Manual (OMM). Revised March 2024. UDEQ, 2023. Letter Re. Soil Gas and Groundwater Investigation Report, Questar Gas Company, Salt Lake North Operations Center December 2022. January 5, 2023. Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM 11 Tables Location ID Northing1 Easting1 Measuring Point Elevation1,3 (ft amsl) Ground Surface Elevation1 (ft amsl) Approximate Screen Interval (ft bgs) DTW (ft BTOC) TD (ft BTOC) Groundwater Elevation(2) (ft amsl) Sample Date Actual Purge Volume (gal) pH Conductivity (μS/cm) Temp (oC) ORP (mV) DO (mg/L) MW-101 7448692.51 1523937.66 4225.52 4226.2 8-18 9.80 18.25 4215.72 12/3/24 2.1 6.86 4955 20.2 -294 0.31 MW-102 7448101.64 1523727.95 4222.56 4222.4 5-15 7.33 13.24 4215.23 12/3/24 1.3 6.92 1764 18.2 -53.0 0.24 MW-103 7448138.32 1524198.09 4222.62 4223.0 8-18 8.49 18.28 4214.13 12/3/24 1.1 6.67 2274 17.6 -21.2 0.50 M-10 7447882.40 1523791.23 4224.00 4224.2 5-15 9.25 15.22 4214.75 12/2/24 0.8 7.11 1796 15.5 20.1 1.1 SW-1 7448432.59 1523931.89 4222.15 4222.6 5-15 6.98 14.62 4215.17 12/3/24 0.6 6.97 3706 18.8 -48.1 0.23 MW-12 7448899.54 1524113.67 4223.00 4223.9 9-24 7.11 23.22 4215.89 12/3/24 1.1 6.84 1502 16.0 -46.3 2.0 PZ-1 7448432.82 1523893.59 4221.81 4222.4 3-13 5.91 12.85 4215.90 PZ-2 7448444.46 1523489.56 4222.92 4223.6 8-18 6.83 17.95 4216.09 PZ-3 7448688.76 1523605.87 4224.24 4224.6 8-18 8.12 18.45 4216.12 SWP-1 7448865.29 1523751.09 4227.37 4224.8 5-20 11.4 22.88 4216.00 SWP-2 7448880.39 1523749.81 4226.94 4224.2 5-20 10.5 22.88 4216.46 SWP-3 7448573.55 1523411.07 4221.83 4222.1 5-20 5.60 19.71 4216.23 SWP-4 7448575.00 1523382.34 4222.89 4223.2 5-20 5.58 19.23 4217.31 SWP-5 7448284.00 1523697.95 4223.29 4223.6 5-20 7.22 19.45 4216.07 SWP-6 7448271.80 1523697.72 4223.49 4223.8 5-20 8.68 22.77 4214.81 Notes: 1 - Northing and Easting coordinates are expressed in State Plan Coordinate System, NAD83, US Survey Feet. Elevation expressed in NAVD 88, feet. 2 - Elevation used in generation of the December 3, 2024 potentiometric surface, see Figure 2. 3 - Top of casing elevation Acronyms: BTOC - below top of casing NAD 83 - North American Datum of 1983 (μS/cm)microsiemens per centimeter DTW - depth to water NA - not applicable (°C)degree Celsius ft - feet TD - total depth (mV)millivolt gal - gallon Temp - temperature (mg/L)milligrams per Liter NAVD 88 - North American Vertical Datum of 1988 US - United States Not Sampled Table 1 Groundwater Sampling Field Parameters Page 1 of 1 MCL MW-101 MW-91011 MW-102 SW-1 MW-103 MW-12 M-10 Well Type Benzene mg/L 5 103 93.9 J 53.2 12.2 <0.0941 <0.0941 <0.0941 Ethylbenzene mg/L 700 184 199 195 6.94 <0.137 <0.137 <0.137 MTBE mg/L 14 <2.02 <10.1 <1.01 <0.101 <0.101 <0.101 <0.101 Naphthalene2 mg/L NE 1110 1200 238 <1.00 <1.00 <1.00 <1.00 Toluene mg/L 1000 17.1 J <27.8 89.7 <0.278 <0.278 <0.278 <0.278 Xylenes, Total mg/L 10000 121 117 J 197 2.12 J <0.174 <0.174 <0.174 1,2,3-Trimethylbenzene mg/L NE 23.6 24.4 J 34.3 0.200 J <0.104 <0.104 <0.104 1,2,4-Trimethylbenzene mg/L NE 32.9 34.8 J 78.4 <0.322 <0.322 <0.322 <0.322 1,3,5-Trimethylbenzene mg/L NE 7.48 J <10.4 30.4 <0.104 <0.104 <0.104 <0.104 Chloroethane mg/L NE <3.84 <19.2 <1.92 <0.192 1.51 J 0.902 J <0.192 Cis-1,2-Dichloroethene mg/L 70 <2.52 <12.6 <1.26 <0.126 0.689 J <0.126 0.670 J Isopropylbenzene mg/L NE 18.9 J 23.2 J 6.47 J 2.54 <0.105 <0.105 <0.105 N-butylbenzene mg/L NE <3.14 <15.7 <1.57 0.186 J <0.157 <0.157 <0.157 N-Propylbenzene mg/L NE 8.18 J 10.8 J 4.42 J 0.616 J <0.0993 <0.0993 <0.0993 P-Isopropyltoluene mg/L NE 3.42 J <12.0 5.65 J 0.525 J <0.120 <0.120 <0.120 Sec-Butylbenzene mg/L NE <2.50 <12.5 <1.25 0.439 J <0.125 <0.125 <0.125 Tert-Butylbenzene mg/L NE <2.54 <12.7 <1.27 0.155 J <0.127 <0.127 <0.127 Trichlorofluoromethane mg/L NE <3.20 <16.0 <1.60 <0.160 <0.160 0.405 J <0.160 Acenaphthene mg/L NE 196 156 117 150 <0.0886 0.198 J <0.0886 Acenaphthylene mg/L NE 15.9 13 7.34 8.66 <0.0921 0.174 J <0.0921 Anthracene mg/L NE 10.4 9.06 5.31 7.35 <0.0804 <0.0804 <0.0804 Benzo(a)Pyrene mg/L 0.2 <0.0381 <0.0381 <0.0381 <0.0381 <0.0381 <0.0381 <0.0381 Fluoranthene mg/L NE 4.01 3.81 1.80 2.91 <0.102 <0.102 <0.102 Fluorene mg/L NE 102 89.9 35.7 28.3 <0.0844 0.145 J <0.0844 Phenanthrene mg/L NE 29.4 26.5 30.3 0.610 J <0.112 0.175 J 0.153 J Pyrene mg/L NE 3.52 2.72 2.00 2.92 <0.107 <0.107 <0.107 2,4-Dimethylphenol mg/L NE 8.14 J 7.85 J <0.0636 <0.0636 <0.0636 <0.0636 <0.0636 Notes: 1Field duplicate collected from MW-101 2Method 8260B value used for Naphthalene Bold values exceed US EPA maximum contaminant level Acronyms: (mg/L)milligrams per Liter MCL maximum contaminant level NE not established SVOCs Semi-Volatile Organic Compounds VOCs Volatile Organic Compounds < Less than laboratory reporting limits Volatile Organic Compounds, SW 846, 8260B Semi-Volatile Organic Compounds, SW 846, 8270C Table 2 Groundwater Analytical Results Monitoring Wells Downgradient WellSource Well Page 1 of 1 Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM 12 Figures Figure 1 Project Location Map August 2023 Co l o r a d o Idaho Wyoming §¨¦80 Detail Area Ne v a d a §¨¦15 §¨¦70 §¨¦84 ±1,000 0 1,000 2,000 Feet Fi l e : L : \ D C S \ P r o j e c t s \ D o m i n i o n \ 6 0 6 4 7 7 0 2 M G P D a t a R e v i e w \ 9 0 0 _ C A D , G I S \ M a p s \ H i s t o r i c _ F i g u r e s \ A P R X \ D o m i n i o n . a p r x \ F i g 1 _ D o m i n i o n _ S i t e M a p Enbridge Gas Utah Salt Lake City, UT 1140 West 200 South Salt Lake City, Utah S 1 0 0 0 W W 200 S W 100 S Euclid Ave Folsom Ave << << << MW-10 4214.75 MW-101 4215.72 MW-102 4215.23 MW-103 4214.13 MW-12* 4215.89 PZ-1 4215.90 PZ-2 4216.09 PZ-3 4216.12 SW-1 4215.17 SWP-1* 4216.00 SWP-2* 4216.46 SWP-3* 4216.23 SWP-4* 4217.31 SWP-5* 4216.07 SWP-6* 4214.81 2 1 2 19 2 1 8 2 1 2 1 21 21 21 3 212 2 1 2 1 9 2 1 8 2 1 µ L: \ D C S \ P r o j e c t s \ D o m i n i o n \ 6 0 6 4 7 7 0 2 M G P D a t a R e v i e w \ 9 0 0 _ C A D , G I S \ M a p s \ H i s t o r i c _ F i g u r e s \ A P R X \ D o m i n i o n . a p r x \ F i g 2 _ P o t e n t i o m e t r i c _ S u r f a c e Figure 2 Potentiometric Surface Map Enbridge Gas Utah Approximate Location of Slurry Wall Utah Gas and Coke Company Site Piezometers (water level only) Monitoring well (water level and sample collection) Imagery: Nearmap 2023 0 240 1 INCH = 120 FEET Project Area Slurry Wall Piezometer< Groundwater Elevation Contour (December 2, 2024) * Well not used in contouring Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM 13 Appendix A Field Forms Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM 14 Appendix B Slurry Wall and Surface Cap Inspection Forms Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM 15 Appendix C Analytical Report ANALYTICAL REPORT December 18, 2024 AECOM - Salt Lake City, Utah Sample Delivery Group:L1805310 Samples Received:12/04/2024 Project Number: Description:Enbridge 2024 Sampling Report To:Lawrence Cannon 756 E. Winchester Street, Suite 400 Salt Lake City, Ut 84107 Entire Report Reviewed By: December 18, 2024 [Preliminary Report] Chris Ward Project Manager Results relate only to the items tested or calibrated and are reported as rounded values. This test report shall not be reproduced, except in full, without written approval of the laboratory. Where applicable, sampling conducted by Pace Analytical National is performed per guidance provided in laboratory standard operating procedures ENV-SOP-MTJL-0067 and ENV-SOP-MTJL-0068. Where sampling conducted by the customer, results relate to the accuracy of the information provided, and as the samples are received. Pace Analytical National 12065 Lebanon Rd Mount Juliet, TN 37122 615-758-5858 800-767-5859 mydata.pacelabs.com 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 1 of 49 December 18, 2024 Chris Ward Project Manager ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 1 of 49 TABLE OF CONTENTS Cp: Cover Page 1 Tc: Table of Contents 2 Ss: Sample Summary 3 Cn: Case Narrative 5 Sr: Sample Results 6 TRIP BLANK L1805310-01 6 M-10 L1805310-02 8 MW-103 L1805310-03 11 MW-12 L1805310-04 14 MW-102 L1805310-05 17 MW-101 L1805310-06 20 MW-9101 L1805310-07 23 SW-1 L1805310-08 26 Qc: Quality Control Summary 29 Volatile Organic Compounds (GC/MS) by Method 8260B 29 Semi Volatile Organic Compounds (GC/MS) by Method 8270C 38 Gl: Glossary of Terms 47 Al: Accreditations & Locations 48 Sc: Sample Chain of Custody 49 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 2 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 2 of 49 SAMPLE SUMMARY Collected by Collected date/time Received date/time TRIP BLANK L1805310-01 GW Krendon Reynolds 12/02/24 00:00 12/04/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B WG2414765 1 12/07/24 15:35 12/07/24 15:35 JBE Mt. Juliet, TN Collected by Collected date/time Received date/time M-10 L1805310-02 GW Krendon Reynolds 12/02/24 15:15 12/04/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B WG2414765 1 12/07/24 19:40 12/07/24 19:40 JBE Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2416895 1 12/11/24 20:01 12/11/24 20:01 DWR Mt. Juliet, TN Semi Volatile Organic Compounds (GC/MS) by Method 8270C WG2412414 1 12/04/24 16:16 12/05/24 07:46 DSH Mt. Juliet, TN Collected by Collected date/time Received date/time MW-103 L1805310-03 GW Krendon Reynolds 12/03/24 10:18 12/04/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B WG2415667 1 12/10/24 11:06 12/10/24 11:06 JBE Mt. Juliet, TN Semi Volatile Organic Compounds (GC/MS) by Method 8270C WG2412414 1 12/04/24 16:16 12/05/24 02:41 DSH Mt. Juliet, TN Collected by Collected date/time Received date/time MW-12 L1805310-04 GW Krendon Reynolds 12/03/24 11:00 12/04/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B WG2415667 1 12/10/24 11:25 12/10/24 11:25 JBE Mt. Juliet, TN Semi Volatile Organic Compounds (GC/MS) by Method 8270C WG2412414 1 12/04/24 16:16 12/05/24 03:02 DSH Mt. Juliet, TN Collected by Collected date/time Received date/time MW-102 L1805310-05 GW Krendon Reynolds 12/03/24 11:40 12/04/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B WG2415667 10 12/10/24 16:27 12/10/24 16:27 JBE Mt. Juliet, TN Semi Volatile Organic Compounds (GC/MS) by Method 8270C WG2412414 1 12/04/24 16:16 12/05/24 03:24 DSH Mt. Juliet, TN Collected by Collected date/time Received date/time MW-101 L1805310-06 GW Krendon Reynolds 12/03/24 12:30 12/04/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B WG2415667 20 12/10/24 16:45 12/10/24 16:45 JBE Mt. Juliet, TN Semi Volatile Organic Compounds (GC/MS) by Method 8270C WG2412414 1 12/04/24 16:16 12/05/24 03:46 DSH Mt. Juliet, TN Collected by Collected date/time Received date/time MW-9101 L1805310-07 GW Krendon Reynolds 12/03/24 12:35 12/04/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B WG2415667 100 12/10/24 17:04 12/10/24 17:04 JBE Mt. Juliet, TN Semi Volatile Organic Compounds (GC/MS) by Method 8270C WG2413151 1 12/09/24 10:52 12/10/24 17:58 AMS Mt. Juliet, TN Semi Volatile Organic Compounds (GC/MS) by Method 8270C WG2413151 5 12/09/24 10:52 12/13/24 21:05 AMS 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: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 3 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 3 of 49 SAMPLE SUMMARY Collected by Collected date/time Received date/time SW-1 L1805310-08 GW Krendon Reynolds 12/03/24 14:00 12/04/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260B WG2415667 1 12/10/24 11:44 12/10/24 11:44 JBE Mt. Juliet, TN Semi Volatile Organic Compounds (GC/MS) by Method 8270C WG2413151 1 12/09/24 10:52 12/10/24 18:20 AMS 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: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 4 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 4 of 49 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] Chris Ward 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: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 5 of 49 Chris Ward Project Manager ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 5 of 49 SAMPLE RESULTS - 01 L1805310 TRIP BLANK Collected date/time: 12/02/24 00:00 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acetone 27.7 J 11.3 50.0 1 12/07/2024 15:35 WG2414765 Acrolein U 2.54 50.0 1 12/07/2024 15:35 WG2414765 Acrylonitrile U J4 0.671 10.0 1 12/07/2024 15:35 WG2414765 Benzene 0.181 J 0.0941 1.00 1 12/07/2024 15:35 WG2414765 Bromobenzene U 0.118 1.00 1 12/07/2024 15:35 WG2414765 Bromodichloromethane U 0.136 1.00 1 12/07/2024 15:35 WG2414765 Bromoform U 0.129 1.00 1 12/07/2024 15:35 WG2414765 Bromomethane U 0.605 5.00 1 12/07/2024 15:35 WG2414765 n-Butylbenzene U 0.157 1.00 1 12/07/2024 15:35 WG2414765 sec-Butylbenzene U 0.125 1.00 1 12/07/2024 15:35 WG2414765 tert-Butylbenzene U 0.127 1.00 1 12/07/2024 15:35 WG2414765 Carbon tetrachloride U J4 0.128 1.00 1 12/07/2024 15:35 WG2414765 Chlorobenzene U 0.116 1.00 1 12/07/2024 15:35 WG2414765 Chlorodibromomethane U 0.140 1.00 1 12/07/2024 15:35 WG2414765 Chloroethane U 0.192 5.00 1 12/07/2024 15:35 WG2414765 Chloroform U 0.111 5.00 1 12/07/2024 15:35 WG2414765 Chloromethane U 0.960 2.50 1 12/07/2024 15:35 WG2414765 2-Chlorotoluene U 0.106 1.00 1 12/07/2024 15:35 WG2414765 4-Chlorotoluene U 0.114 1.00 1 12/07/2024 15:35 WG2414765 1,2-Dibromo-3-Chloropropane U 0.276 5.00 1 12/07/2024 15:35 WG2414765 1,2-Dibromoethane U 0.126 1.00 1 12/07/2024 15:35 WG2414765 Dibromomethane U 0.122 1.00 1 12/07/2024 15:35 WG2414765 1,2-Dichlorobenzene U 0.107 1.00 1 12/07/2024 15:35 WG2414765 1,3-Dichlorobenzene U 0.110 1.00 1 12/07/2024 15:35 WG2414765 1,4-Dichlorobenzene U 0.120 1.00 1 12/07/2024 15:35 WG2414765 Dichlorodifluoromethane U 0.374 5.00 1 12/07/2024 15:35 WG2414765 1,1-Dichloroethane U 0.100 1.00 1 12/07/2024 15:35 WG2414765 1,2-Dichloroethane U 0.0819 1.00 1 12/07/2024 15:35 WG2414765 1,1-Dichloroethene U 0.188 1.00 1 12/07/2024 15:35 WG2414765 cis-1,2-Dichloroethene U 0.126 1.00 1 12/07/2024 15:35 WG2414765 trans-1,2-Dichloroethene U 0.149 1.00 1 12/07/2024 15:35 WG2414765 1,2-Dichloropropane U 0.149 1.00 1 12/07/2024 15:35 WG2414765 1,1-Dichloropropene U 0.142 1.00 1 12/07/2024 15:35 WG2414765 1,3-Dichloropropane U 0.110 1.00 1 12/07/2024 15:35 WG2414765 cis-1,3-Dichloropropene U 0.111 1.00 1 12/07/2024 15:35 WG2414765 trans-1,3-Dichloropropene U 0.118 1.00 1 12/07/2024 15:35 WG2414765 2,2-Dichloropropane U 0.161 1.00 1 12/07/2024 15:35 WG2414765 Di-isopropyl ether U 0.105 1.00 1 12/07/2024 15:35 WG2414765 Ethylbenzene U 0.137 1.00 1 12/07/2024 15:35 WG2414765 Hexachloro-1,3-butadiene U 0.337 1.00 1 12/07/2024 15:35 WG2414765 Isopropylbenzene U 0.105 1.00 1 12/07/2024 15:35 WG2414765 p-Isopropyltoluene U 0.120 1.00 1 12/07/2024 15:35 WG2414765 2-Butanone (MEK)U 1.19 10.0 1 12/07/2024 15:35 WG2414765 Methylene Chloride U 0.430 5.00 1 12/07/2024 15:35 WG2414765 4-Methyl-2-pentanone (MIBK)U 0.478 10.0 1 12/07/2024 15:35 WG2414765 Methyl tert-butyl ether U 0.101 1.00 1 12/07/2024 15:35 WG2414765 Naphthalene U 1.00 5.00 1 12/07/2024 15:35 WG2414765 n-Propylbenzene U 0.0993 1.00 1 12/07/2024 15:35 WG2414765 Styrene U 0.118 1.00 1 12/07/2024 15:35 WG2414765 1,1,1,2-Tetrachloroethane U 0.147 1.00 1 12/07/2024 15:35 WG2414765 1,1,2,2-Tetrachloroethane U 0.133 1.00 1 12/07/2024 15:35 WG2414765 1,1,2-Trichlorotrifluoroethane U 0.180 1.00 1 12/07/2024 15:35 WG2414765 Tetrachloroethene U 0.300 1.00 1 12/07/2024 15:35 WG2414765 Toluene 0.766 J 0.278 1.00 1 12/07/2024 15:35 WG2414765 1,2,3-Trichlorobenzene U 0.230 1.00 1 12/07/2024 15:35 WG2414765 1,2,4-Trichlorobenzene U 0.481 1.00 1 12/07/2024 15:35 WG2414765 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 6 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 6 of 49 SAMPLE RESULTS - 01 L1805310 TRIP BLANK Collected date/time: 12/02/24 00:00 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time 1,1,1-Trichloroethane U 0.149 1.00 1 12/07/2024 15:35 WG2414765 1,1,2-Trichloroethane U 0.158 1.00 1 12/07/2024 15:35 WG2414765 Trichloroethene U 0.190 1.00 1 12/07/2024 15:35 WG2414765 Trichlorofluoromethane U 0.160 5.00 1 12/07/2024 15:35 WG2414765 1,2,3-Trichloropropane U 0.237 2.50 1 12/07/2024 15:35 WG2414765 1,2,4-Trimethylbenzene U 0.322 1.00 1 12/07/2024 15:35 WG2414765 1,2,3-Trimethylbenzene U 0.104 1.00 1 12/07/2024 15:35 WG2414765 1,3,5-Trimethylbenzene U 0.104 1.00 1 12/07/2024 15:35 WG2414765 Vinyl chloride U 0.234 1.00 1 12/07/2024 15:35 WG2414765 Xylenes, Total 0.320 J 0.174 3.00 1 12/07/2024 15:35 WG2414765 (S) Toluene-d8 101 80.0-120 12/07/2024 15:35 WG2414765 (S) 4-Bromofluorobenzene 96.3 77.0-126 12/07/2024 15:35 WG2414765 (S) 1,2-Dichloroethane-d4 121 70.0-130 12/07/2024 15:35 WG2414765 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 7 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 7 of 49 SAMPLE RESULTS - 02 L1805310 M-10 Collected date/time: 12/02/24 15:15 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acetone U 11.3 50.0 1 12/07/2024 19:40 WG2414765 Acrolein U 2.54 50.0 1 12/07/2024 19:40 WG2414765 Acrylonitrile U J4 0.671 10.0 1 12/07/2024 19:40 WG2414765 Benzene U 0.0941 1.00 1 12/07/2024 19:40 WG2414765 Bromobenzene U 0.118 1.00 1 12/07/2024 19:40 WG2414765 Bromodichloromethane U 0.136 1.00 1 12/07/2024 19:40 WG2414765 Bromoform U 0.129 1.00 1 12/07/2024 19:40 WG2414765 Bromomethane U 0.605 5.00 1 12/07/2024 19:40 WG2414765 n-Butylbenzene U 0.157 1.00 1 12/07/2024 19:40 WG2414765 sec-Butylbenzene U 0.125 1.00 1 12/07/2024 19:40 WG2414765 tert-Butylbenzene U 0.127 1.00 1 12/07/2024 19:40 WG2414765 Carbon tetrachloride U J4 0.128 1.00 1 12/07/2024 19:40 WG2414765 Chlorobenzene U 0.116 1.00 1 12/07/2024 19:40 WG2414765 Chlorodibromomethane U 0.140 1.00 1 12/07/2024 19:40 WG2414765 Chloroethane U 0.192 5.00 1 12/07/2024 19:40 WG2414765 Chloroform U 0.111 5.00 1 12/07/2024 19:40 WG2414765 Chloromethane U 0.960 2.50 1 12/07/2024 19:40 WG2414765 2-Chlorotoluene U 0.106 1.00 1 12/07/2024 19:40 WG2414765 4-Chlorotoluene U 0.114 1.00 1 12/07/2024 19:40 WG2414765 1,2-Dibromo-3-Chloropropane U 0.276 5.00 1 12/07/2024 19:40 WG2414765 1,2-Dibromoethane U 0.126 1.00 1 12/07/2024 19:40 WG2414765 Dibromomethane U 0.122 1.00 1 12/07/2024 19:40 WG2414765 1,2-Dichlorobenzene U 0.107 1.00 1 12/07/2024 19:40 WG2414765 1,3-Dichlorobenzene U 0.110 1.00 1 12/07/2024 19:40 WG2414765 1,4-Dichlorobenzene U 0.120 1.00 1 12/07/2024 19:40 WG2414765 Dichlorodifluoromethane U 0.374 5.00 1 12/07/2024 19:40 WG2414765 1,1-Dichloroethane U 0.100 1.00 1 12/07/2024 19:40 WG2414765 1,2-Dichloroethane U 0.0819 1.00 1 12/07/2024 19:40 WG2414765 1,1-Dichloroethene U 0.188 1.00 1 12/07/2024 19:40 WG2414765 cis-1,2-Dichloroethene 0.670 J 0.126 1.00 1 12/11/2024 20:01 WG2416895 trans-1,2-Dichloroethene U 0.149 1.00 1 12/07/2024 19:40 WG2414765 1,2-Dichloropropane U 0.149 1.00 1 12/07/2024 19:40 WG2414765 1,1-Dichloropropene U 0.142 1.00 1 12/07/2024 19:40 WG2414765 1,3-Dichloropropane U 0.110 1.00 1 12/07/2024 19:40 WG2414765 cis-1,3-Dichloropropene U 0.111 1.00 1 12/07/2024 19:40 WG2414765 trans-1,3-Dichloropropene U 0.118 1.00 1 12/07/2024 19:40 WG2414765 2,2-Dichloropropane U 0.161 1.00 1 12/07/2024 19:40 WG2414765 Di-isopropyl ether U 0.105 1.00 1 12/07/2024 19:40 WG2414765 Ethylbenzene U 0.137 1.00 1 12/07/2024 19:40 WG2414765 Hexachloro-1,3-butadiene U 0.337 1.00 1 12/07/2024 19:40 WG2414765 Isopropylbenzene U 0.105 1.00 1 12/07/2024 19:40 WG2414765 p-Isopropyltoluene U 0.120 1.00 1 12/07/2024 19:40 WG2414765 2-Butanone (MEK)U 1.19 10.0 1 12/07/2024 19:40 WG2414765 Methylene Chloride U 0.430 5.00 1 12/07/2024 19:40 WG2414765 4-Methyl-2-pentanone (MIBK)U 0.478 10.0 1 12/07/2024 19:40 WG2414765 Methyl tert-butyl ether U 0.101 1.00 1 12/07/2024 19:40 WG2414765 Naphthalene U 1.00 5.00 1 12/07/2024 19:40 WG2414765 n-Propylbenzene U 0.0993 1.00 1 12/07/2024 19:40 WG2414765 Styrene U 0.118 1.00 1 12/07/2024 19:40 WG2414765 1,1,1,2-Tetrachloroethane U 0.147 1.00 1 12/07/2024 19:40 WG2414765 1,1,2,2-Tetrachloroethane U 0.133 1.00 1 12/07/2024 19:40 WG2414765 1,1,2-Trichlorotrifluoroethane U 0.180 1.00 1 12/07/2024 19:40 WG2414765 Tetrachloroethene U 0.300 1.00 1 12/11/2024 20:01 WG2416895 Toluene U 0.278 1.00 1 12/07/2024 19:40 WG2414765 1,2,3-Trichlorobenzene U 0.230 1.00 1 12/07/2024 19:40 WG2414765 1,2,4-Trichlorobenzene U 0.481 1.00 1 12/07/2024 19:40 WG2414765 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 8 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 8 of 49 SAMPLE RESULTS - 02 L1805310 M-10 Collected date/time: 12/02/24 15:15 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time 1,1,1-Trichloroethane U 0.149 1.00 1 12/07/2024 19:40 WG2414765 1,1,2-Trichloroethane U 0.158 1.00 1 12/07/2024 19:40 WG2414765 Trichloroethene U 0.190 1.00 1 12/07/2024 19:40 WG2414765 Trichlorofluoromethane U 0.160 5.00 1 12/07/2024 19:40 WG2414765 1,2,3-Trichloropropane U 0.237 2.50 1 12/07/2024 19:40 WG2414765 1,2,4-Trimethylbenzene U 0.322 1.00 1 12/07/2024 19:40 WG2414765 1,2,3-Trimethylbenzene U 0.104 1.00 1 12/07/2024 19:40 WG2414765 1,3,5-Trimethylbenzene U 0.104 1.00 1 12/07/2024 19:40 WG2414765 Vinyl chloride U 0.234 1.00 1 12/07/2024 19:40 WG2414765 Xylenes, Total U 0.174 3.00 1 12/07/2024 19:40 WG2414765 (S) Toluene-d8 99.7 80.0-120 12/07/2024 19:40 WG2414765 (S) Toluene-d8 84.9 80.0-120 12/11/2024 20:01 WG2416895 (S) 4-Bromofluorobenzene 96.6 77.0-126 12/07/2024 19:40 WG2414765 (S) 4-Bromofluorobenzene 93.9 77.0-126 12/11/2024 20:01 WG2416895 (S) 1,2-Dichloroethane-d4 120 70.0-130 12/07/2024 19:40 WG2414765 (S) 1,2-Dichloroethane-d4 149 J1 70.0-130 12/11/2024 20:01 WG2416895 Semi Volatile Organic Compounds (GC/MS) by Method 8270C Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acenaphthene U 0.0886 1.00 1 12/05/2024 07:46 WG2412414 Acenaphthylene U 0.0921 1.00 1 12/05/2024 07:46 WG2412414 Anthracene U 0.0804 1.00 1 12/05/2024 07:46 WG2412414 Benzidine U J4 3.74 10.0 1 12/05/2024 07:46 WG2412414 Benzo(a)anthracene U 0.199 1.00 1 12/05/2024 07:46 WG2412414 Benzo(b)fluoranthene U 0.130 1.00 1 12/05/2024 07:46 WG2412414 Benzo(k)fluoranthene U 0.120 1.00 1 12/05/2024 07:46 WG2412414 Benzo(g,h,i)perylene U 0.121 1.00 1 12/05/2024 07:46 WG2412414 Benzo(a)pyrene U 0.0381 1.00 1 12/05/2024 07:46 WG2412414 Bis(2-chlorethoxy)methane U 0.116 10.0 1 12/05/2024 07:46 WG2412414 Bis(2-chloroethyl)ether U 0.137 10.0 1 12/05/2024 07:46 WG2412414 2,2-Oxybis(1-Chloropropane)U 0.210 10.0 1 12/05/2024 07:46 WG2412414 4-Bromophenyl-phenylether U 0.0877 10.0 1 12/05/2024 07:46 WG2412414 2-Chloronaphthalene U 0.0648 1.00 1 12/05/2024 07:46 WG2412414 4-Chlorophenyl-phenylether U 0.0926 10.0 1 12/05/2024 07:46 WG2412414 Chrysene U 0.130 1.00 1 12/05/2024 07:46 WG2412414 Dibenz(a,h)anthracene U 0.0644 1.00 1 12/05/2024 07:46 WG2412414 1,2-Dichlorobenzene U 0.0713 10.0 1 12/05/2024 07:46 WG2412414 1,3-Dichlorobenzene U 0.132 10.0 1 12/05/2024 07:46 WG2412414 1,4-Dichlorobenzene U 0.0942 10.0 1 12/05/2024 07:46 WG2412414 3,3-Dichlorobenzidine U 0.212 10.0 1 12/05/2024 07:46 WG2412414 2,4-Dinitrotoluene U 0.0983 10.0 1 12/05/2024 07:46 WG2412414 2,6-Dinitrotoluene U 0.250 10.0 1 12/05/2024 07:46 WG2412414 Fluoranthene U 0.102 1.00 1 12/05/2024 07:46 WG2412414 Fluorene U 0.0844 1.00 1 12/05/2024 07:46 WG2412414 Hexachlorobenzene U 0.0755 1.00 1 12/05/2024 07:46 WG2412414 Hexachloro-1,3-butadiene U 0.0968 10.0 1 12/05/2024 07:46 WG2412414 Hexachlorocyclopentadiene U 0.0598 10.0 1 12/05/2024 07:46 WG2412414 Hexachloroethane U 0.127 10.0 1 12/05/2024 07:46 WG2412414 Indeno(1,2,3-cd)pyrene U 0.279 1.00 1 12/05/2024 07:46 WG2412414 Isophorone U 0.143 10.0 1 12/05/2024 07:46 WG2412414 Naphthalene U 0.159 1.00 1 12/05/2024 07:46 WG2412414 Nitrobenzene U 0.297 10.0 1 12/05/2024 07:46 WG2412414 n-Nitrosodimethylamine U 0.998 10.0 1 12/05/2024 07:46 WG2412414 n-Nitrosodiphenylamine U 2.37 10.0 1 12/05/2024 07:46 WG2412414 n-Nitrosodi-n-propylamine U 0.261 10.0 1 12/05/2024 07:46 WG2412414 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 9 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 9 of 49 SAMPLE RESULTS - 02 L1805310 M-10 Collected date/time: 12/02/24 15:15 Semi Volatile Organic Compounds (GC/MS) by Method 8270C Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Phenanthrene 0.153 J 0.112 1.00 1 12/05/2024 07:46 WG2412414 Benzylbutyl phthalate U 0.765 3.00 1 12/05/2024 07:46 WG2412414 Bis(2-ethylhexyl)phthalate U 0.895 3.00 1 12/05/2024 07:46 WG2412414 Di-n-butyl phthalate U 0.453 3.00 1 12/05/2024 07:46 WG2412414 Diethyl phthalate U 0.287 3.00 1 12/05/2024 07:46 WG2412414 Dimethyl phthalate U 0.260 3.00 1 12/05/2024 07:46 WG2412414 Di-n-octyl phthalate U 0.932 3.00 1 12/05/2024 07:46 WG2412414 Pyrene U 0.107 1.00 1 12/05/2024 07:46 WG2412414 1,2,4-Trichlorobenzene U 0.0698 10.0 1 12/05/2024 07:46 WG2412414 4-Chloro-3-methylphenol U 0.131 10.0 1 12/05/2024 07:46 WG2412414 2-Chlorophenol U 0.133 10.0 1 12/05/2024 07:46 WG2412414 2,4-Dichlorophenol U 0.102 10.0 1 12/05/2024 07:46 WG2412414 2,4-Dimethylphenol U 0.0636 10.0 1 12/05/2024 07:46 WG2412414 4,6-Dinitro-2-methylphenol U 1.12 10.0 1 12/05/2024 07:46 WG2412414 2,4-Dinitrophenol U 5.93 10.0 1 12/05/2024 07:46 WG2412414 2-Nitrophenol U 0.117 10.0 1 12/05/2024 07:46 WG2412414 4-Nitrophenol U 0.143 10.0 1 12/05/2024 07:46 WG2412414 Pentachlorophenol U 0.313 10.0 1 12/05/2024 07:46 WG2412414 Phenol U 4.33 10.0 1 12/05/2024 07:46 WG2412414 2,4,6-Trichlorophenol U 0.100 10.0 1 12/05/2024 07:46 WG2412414 (S) 2-Fluorophenol 30.4 10.0-120 12/05/2024 07:46 WG2412414 (S) Phenol-d5 20.3 10.0-120 12/05/2024 07:46 WG2412414 (S) Nitrobenzene-d5 61.3 10.0-127 12/05/2024 07:46 WG2412414 (S) 2-Fluorobiphenyl 69.5 10.0-130 12/05/2024 07:46 WG2412414 (S) 2,4,6-Tribromophenol 63.6 10.0-155 12/05/2024 07:46 WG2412414 (S) p-Terphenyl-d14 70.7 10.0-128 12/05/2024 07:46 WG2412414 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 10 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 10 of 49 SAMPLE RESULTS - 03 L1805310 MW-103 Collected date/time: 12/03/24 10:18 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acetone U 11.3 50.0 1 12/10/2024 11:06 WG2415667 Acrolein U J3 J4 2.54 50.0 1 12/10/2024 11:06 WG2415667 Acrylonitrile U J4 0.671 10.0 1 12/10/2024 11:06 WG2415667 Benzene U 0.0941 1.00 1 12/10/2024 11:06 WG2415667 Bromobenzene U 0.118 1.00 1 12/10/2024 11:06 WG2415667 Bromodichloromethane U 0.136 1.00 1 12/10/2024 11:06 WG2415667 Bromoform U 0.129 1.00 1 12/10/2024 11:06 WG2415667 Bromomethane U 0.605 5.00 1 12/10/2024 11:06 WG2415667 n-Butylbenzene U 0.157 1.00 1 12/10/2024 11:06 WG2415667 sec-Butylbenzene U 0.125 1.00 1 12/10/2024 11:06 WG2415667 tert-Butylbenzene U 0.127 1.00 1 12/10/2024 11:06 WG2415667 Carbon tetrachloride U 0.128 1.00 1 12/10/2024 11:06 WG2415667 Chlorobenzene U 0.116 1.00 1 12/10/2024 11:06 WG2415667 Chlorodibromomethane U 0.140 1.00 1 12/10/2024 11:06 WG2415667 Chloroethane 1.51 J 0.192 5.00 1 12/10/2024 11:06 WG2415667 Chloroform U 0.111 5.00 1 12/10/2024 11:06 WG2415667 Chloromethane U 0.960 2.50 1 12/10/2024 11:06 WG2415667 2-Chlorotoluene U 0.106 1.00 1 12/10/2024 11:06 WG2415667 4-Chlorotoluene U 0.114 1.00 1 12/10/2024 11:06 WG2415667 1,2-Dibromo-3-Chloropropane U 0.276 5.00 1 12/10/2024 11:06 WG2415667 1,2-Dibromoethane U 0.126 1.00 1 12/10/2024 11:06 WG2415667 Dibromomethane U 0.122 1.00 1 12/10/2024 11:06 WG2415667 1,2-Dichlorobenzene U 0.107 1.00 1 12/10/2024 11:06 WG2415667 1,3-Dichlorobenzene U 0.110 1.00 1 12/10/2024 11:06 WG2415667 1,4-Dichlorobenzene U 0.120 1.00 1 12/10/2024 11:06 WG2415667 Dichlorodifluoromethane U 0.374 5.00 1 12/10/2024 11:06 WG2415667 1,1-Dichloroethane U 0.100 1.00 1 12/10/2024 11:06 WG2415667 1,2-Dichloroethane U 0.0819 1.00 1 12/10/2024 11:06 WG2415667 1,1-Dichloroethene U 0.188 1.00 1 12/10/2024 11:06 WG2415667 cis-1,2-Dichloroethene 0.689 J 0.126 1.00 1 12/10/2024 11:06 WG2415667 trans-1,2-Dichloroethene U 0.149 1.00 1 12/10/2024 11:06 WG2415667 1,2-Dichloropropane U 0.149 1.00 1 12/10/2024 11:06 WG2415667 1,1-Dichloropropene U 0.142 1.00 1 12/10/2024 11:06 WG2415667 1,3-Dichloropropane U 0.110 1.00 1 12/10/2024 11:06 WG2415667 cis-1,3-Dichloropropene U 0.111 1.00 1 12/10/2024 11:06 WG2415667 trans-1,3-Dichloropropene U 0.118 1.00 1 12/10/2024 11:06 WG2415667 2,2-Dichloropropane U 0.161 1.00 1 12/10/2024 11:06 WG2415667 Di-isopropyl ether U 0.105 1.00 1 12/10/2024 11:06 WG2415667 Ethylbenzene U 0.137 1.00 1 12/10/2024 11:06 WG2415667 Hexachloro-1,3-butadiene U 0.337 1.00 1 12/10/2024 11:06 WG2415667 Isopropylbenzene U 0.105 1.00 1 12/10/2024 11:06 WG2415667 p-Isopropyltoluene U 0.120 1.00 1 12/10/2024 11:06 WG2415667 2-Butanone (MEK)U J4 1.19 10.0 1 12/10/2024 11:06 WG2415667 Methylene Chloride U 0.430 5.00 1 12/10/2024 11:06 WG2415667 4-Methyl-2-pentanone (MIBK)U 0.478 10.0 1 12/10/2024 11:06 WG2415667 Methyl tert-butyl ether U 0.101 1.00 1 12/10/2024 11:06 WG2415667 Naphthalene U 1.00 5.00 1 12/10/2024 11:06 WG2415667 n-Propylbenzene U 0.0993 1.00 1 12/10/2024 11:06 WG2415667 Styrene U 0.118 1.00 1 12/10/2024 11:06 WG2415667 1,1,1,2-Tetrachloroethane U 0.147 1.00 1 12/10/2024 11:06 WG2415667 1,1,2,2-Tetrachloroethane U 0.133 1.00 1 12/10/2024 11:06 WG2415667 1,1,2-Trichlorotrifluoroethane U 0.180 1.00 1 12/10/2024 11:06 WG2415667 Tetrachloroethene U 0.300 1.00 1 12/10/2024 11:06 WG2415667 Toluene U 0.278 1.00 1 12/10/2024 11:06 WG2415667 1,2,3-Trichlorobenzene U 0.230 1.00 1 12/10/2024 11:06 WG2415667 1,2,4-Trichlorobenzene U 0.481 1.00 1 12/10/2024 11:06 WG2415667 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 11 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 11 of 49 SAMPLE RESULTS - 03 L1805310 MW-103 Collected date/time: 12/03/24 10:18 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time 1,1,1-Trichloroethane U 0.149 1.00 1 12/10/2024 11:06 WG2415667 1,1,2-Trichloroethane U 0.158 1.00 1 12/10/2024 11:06 WG2415667 Trichloroethene U 0.190 1.00 1 12/10/2024 11:06 WG2415667 Trichlorofluoromethane U 0.160 5.00 1 12/10/2024 11:06 WG2415667 1,2,3-Trichloropropane U 0.237 2.50 1 12/10/2024 11:06 WG2415667 1,2,4-Trimethylbenzene U 0.322 1.00 1 12/10/2024 11:06 WG2415667 1,2,3-Trimethylbenzene U 0.104 1.00 1 12/10/2024 11:06 WG2415667 1,3,5-Trimethylbenzene U 0.104 1.00 1 12/10/2024 11:06 WG2415667 Vinyl chloride U 0.234 1.00 1 12/10/2024 11:06 WG2415667 Xylenes, Total U 0.174 3.00 1 12/10/2024 11:06 WG2415667 (S) Toluene-d8 94.4 80.0-120 12/10/2024 11:06 WG2415667 (S) 4-Bromofluorobenzene 101 77.0-126 12/10/2024 11:06 WG2415667 (S) 1,2-Dichloroethane-d4 131 J1 70.0-130 12/10/2024 11:06 WG2415667 Semi Volatile Organic Compounds (GC/MS) by Method 8270C Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acenaphthene U 0.0886 1.00 1 12/05/2024 02:41 WG2412414 Acenaphthylene U 0.0921 1.00 1 12/05/2024 02:41 WG2412414 Anthracene U 0.0804 1.00 1 12/05/2024 02:41 WG2412414 Benzidine U J4 3.74 10.0 1 12/05/2024 02:41 WG2412414 Benzo(a)anthracene U 0.199 1.00 1 12/05/2024 02:41 WG2412414 Benzo(b)fluoranthene U 0.130 1.00 1 12/05/2024 02:41 WG2412414 Benzo(k)fluoranthene U 0.120 1.00 1 12/05/2024 02:41 WG2412414 Benzo(g,h,i)perylene U 0.121 1.00 1 12/05/2024 02:41 WG2412414 Benzo(a)pyrene U 0.0381 1.00 1 12/05/2024 02:41 WG2412414 Bis(2-chlorethoxy)methane U 0.116 10.0 1 12/05/2024 02:41 WG2412414 Bis(2-chloroethyl)ether U 0.137 10.0 1 12/05/2024 02:41 WG2412414 2,2-Oxybis(1-Chloropropane)U 0.210 10.0 1 12/05/2024 02:41 WG2412414 4-Bromophenyl-phenylether U 0.0877 10.0 1 12/05/2024 02:41 WG2412414 2-Chloronaphthalene U 0.0648 1.00 1 12/05/2024 02:41 WG2412414 4-Chlorophenyl-phenylether U 0.0926 10.0 1 12/05/2024 02:41 WG2412414 Chrysene U 0.130 1.00 1 12/05/2024 02:41 WG2412414 Dibenz(a,h)anthracene U 0.0644 1.00 1 12/05/2024 02:41 WG2412414 1,2-Dichlorobenzene U 0.0713 10.0 1 12/05/2024 02:41 WG2412414 1,3-Dichlorobenzene U 0.132 10.0 1 12/05/2024 02:41 WG2412414 1,4-Dichlorobenzene U 0.0942 10.0 1 12/05/2024 02:41 WG2412414 3,3-Dichlorobenzidine U 0.212 10.0 1 12/05/2024 02:41 WG2412414 2,4-Dinitrotoluene U 0.0983 10.0 1 12/05/2024 02:41 WG2412414 2,6-Dinitrotoluene U 0.250 10.0 1 12/05/2024 02:41 WG2412414 Fluoranthene U 0.102 1.00 1 12/05/2024 02:41 WG2412414 Fluorene U 0.0844 1.00 1 12/05/2024 02:41 WG2412414 Hexachlorobenzene U 0.0755 1.00 1 12/05/2024 02:41 WG2412414 Hexachloro-1,3-butadiene U 0.0968 10.0 1 12/05/2024 02:41 WG2412414 Hexachlorocyclopentadiene U 0.0598 10.0 1 12/05/2024 02:41 WG2412414 Hexachloroethane U 0.127 10.0 1 12/05/2024 02:41 WG2412414 Indeno(1,2,3-cd)pyrene U 0.279 1.00 1 12/05/2024 02:41 WG2412414 Isophorone U 0.143 10.0 1 12/05/2024 02:41 WG2412414 Naphthalene U 0.159 1.00 1 12/05/2024 02:41 WG2412414 Nitrobenzene U 0.297 10.0 1 12/05/2024 02:41 WG2412414 n-Nitrosodimethylamine U 0.998 10.0 1 12/05/2024 02:41 WG2412414 n-Nitrosodiphenylamine U 2.37 10.0 1 12/05/2024 02:41 WG2412414 n-Nitrosodi-n-propylamine U 0.261 10.0 1 12/05/2024 02:41 WG2412414 Phenanthrene U 0.112 1.00 1 12/05/2024 02:41 WG2412414 Benzylbutyl phthalate U 0.765 3.00 1 12/05/2024 02:41 WG2412414 Bis(2-ethylhexyl)phthalate U 0.895 3.00 1 12/05/2024 02:41 WG2412414 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 12 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 12 of 49 SAMPLE RESULTS - 03 L1805310 MW-103 Collected date/time: 12/03/24 10:18 Semi Volatile Organic Compounds (GC/MS) by Method 8270C Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Di-n-butyl phthalate U 0.453 3.00 1 12/05/2024 02:41 WG2412414 Diethyl phthalate U 0.287 3.00 1 12/05/2024 02:41 WG2412414 Dimethyl phthalate U 0.260 3.00 1 12/05/2024 02:41 WG2412414 Di-n-octyl phthalate U 0.932 3.00 1 12/05/2024 02:41 WG2412414 Pyrene U 0.107 1.00 1 12/05/2024 02:41 WG2412414 1,2,4-Trichlorobenzene U 0.0698 10.0 1 12/05/2024 02:41 WG2412414 4-Chloro-3-methylphenol U 0.131 10.0 1 12/05/2024 02:41 WG2412414 2-Chlorophenol U 0.133 10.0 1 12/05/2024 02:41 WG2412414 2,4-Dichlorophenol U 0.102 10.0 1 12/05/2024 02:41 WG2412414 2,4-Dimethylphenol U 0.0636 10.0 1 12/05/2024 02:41 WG2412414 4,6-Dinitro-2-methylphenol U 1.12 10.0 1 12/05/2024 02:41 WG2412414 2,4-Dinitrophenol U 5.93 10.0 1 12/05/2024 02:41 WG2412414 2-Nitrophenol U 0.117 10.0 1 12/05/2024 02:41 WG2412414 4-Nitrophenol U 0.143 10.0 1 12/05/2024 02:41 WG2412414 Pentachlorophenol U 0.313 10.0 1 12/05/2024 02:41 WG2412414 Phenol U 4.33 10.0 1 12/05/2024 02:41 WG2412414 2,4,6-Trichlorophenol U 0.100 10.0 1 12/05/2024 02:41 WG2412414 (S) 2-Fluorophenol 27.9 10.0-120 12/05/2024 02:41 WG2412414 (S) Phenol-d5 19.5 10.0-120 12/05/2024 02:41 WG2412414 (S) Nitrobenzene-d5 60.2 10.0-127 12/05/2024 02:41 WG2412414 (S) 2-Fluorobiphenyl 65.5 10.0-130 12/05/2024 02:41 WG2412414 (S) 2,4,6-Tribromophenol 45.3 10.0-155 12/05/2024 02:41 WG2412414 (S) p-Terphenyl-d14 61.8 10.0-128 12/05/2024 02:41 WG2412414 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 13 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 13 of 49 SAMPLE RESULTS - 04 L1805310 MW-12 Collected date/time: 12/03/24 11:00 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acetone U 11.3 50.0 1 12/10/2024 11:25 WG2415667 Acrolein U J3 J4 2.54 50.0 1 12/10/2024 11:25 WG2415667 Acrylonitrile U J4 0.671 10.0 1 12/10/2024 11:25 WG2415667 Benzene U 0.0941 1.00 1 12/10/2024 11:25 WG2415667 Bromobenzene U 0.118 1.00 1 12/10/2024 11:25 WG2415667 Bromodichloromethane U 0.136 1.00 1 12/10/2024 11:25 WG2415667 Bromoform U 0.129 1.00 1 12/10/2024 11:25 WG2415667 Bromomethane U 0.605 5.00 1 12/10/2024 11:25 WG2415667 n-Butylbenzene U 0.157 1.00 1 12/10/2024 11:25 WG2415667 sec-Butylbenzene U 0.125 1.00 1 12/10/2024 11:25 WG2415667 tert-Butylbenzene U 0.127 1.00 1 12/10/2024 11:25 WG2415667 Carbon tetrachloride U 0.128 1.00 1 12/10/2024 11:25 WG2415667 Chlorobenzene U 0.116 1.00 1 12/10/2024 11:25 WG2415667 Chlorodibromomethane U 0.140 1.00 1 12/10/2024 11:25 WG2415667 Chloroethane 0.902 J 0.192 5.00 1 12/10/2024 11:25 WG2415667 Chloroform U 0.111 5.00 1 12/10/2024 11:25 WG2415667 Chloromethane U 0.960 2.50 1 12/10/2024 11:25 WG2415667 2-Chlorotoluene U 0.106 1.00 1 12/10/2024 11:25 WG2415667 4-Chlorotoluene U 0.114 1.00 1 12/10/2024 11:25 WG2415667 1,2-Dibromo-3-Chloropropane U 0.276 5.00 1 12/10/2024 11:25 WG2415667 1,2-Dibromoethane U 0.126 1.00 1 12/10/2024 11:25 WG2415667 Dibromomethane U 0.122 1.00 1 12/10/2024 11:25 WG2415667 1,2-Dichlorobenzene U 0.107 1.00 1 12/10/2024 11:25 WG2415667 1,3-Dichlorobenzene U 0.110 1.00 1 12/10/2024 11:25 WG2415667 1,4-Dichlorobenzene U 0.120 1.00 1 12/10/2024 11:25 WG2415667 Dichlorodifluoromethane U 0.374 5.00 1 12/10/2024 11:25 WG2415667 1,1-Dichloroethane U 0.100 1.00 1 12/10/2024 11:25 WG2415667 1,2-Dichloroethane U 0.0819 1.00 1 12/10/2024 11:25 WG2415667 1,1-Dichloroethene U 0.188 1.00 1 12/10/2024 11:25 WG2415667 cis-1,2-Dichloroethene U 0.126 1.00 1 12/10/2024 11:25 WG2415667 trans-1,2-Dichloroethene U 0.149 1.00 1 12/10/2024 11:25 WG2415667 1,2-Dichloropropane U 0.149 1.00 1 12/10/2024 11:25 WG2415667 1,1-Dichloropropene U 0.142 1.00 1 12/10/2024 11:25 WG2415667 1,3-Dichloropropane U 0.110 1.00 1 12/10/2024 11:25 WG2415667 cis-1,3-Dichloropropene U 0.111 1.00 1 12/10/2024 11:25 WG2415667 trans-1,3-Dichloropropene U 0.118 1.00 1 12/10/2024 11:25 WG2415667 2,2-Dichloropropane U 0.161 1.00 1 12/10/2024 11:25 WG2415667 Di-isopropyl ether U 0.105 1.00 1 12/10/2024 11:25 WG2415667 Ethylbenzene U 0.137 1.00 1 12/10/2024 11:25 WG2415667 Hexachloro-1,3-butadiene U 0.337 1.00 1 12/10/2024 11:25 WG2415667 Isopropylbenzene U 0.105 1.00 1 12/10/2024 11:25 WG2415667 p-Isopropyltoluene U 0.120 1.00 1 12/10/2024 11:25 WG2415667 2-Butanone (MEK)U J4 1.19 10.0 1 12/10/2024 11:25 WG2415667 Methylene Chloride U 0.430 5.00 1 12/10/2024 11:25 WG2415667 4-Methyl-2-pentanone (MIBK)U 0.478 10.0 1 12/10/2024 11:25 WG2415667 Methyl tert-butyl ether U 0.101 1.00 1 12/10/2024 11:25 WG2415667 Naphthalene U 1.00 5.00 1 12/10/2024 11:25 WG2415667 n-Propylbenzene U 0.0993 1.00 1 12/10/2024 11:25 WG2415667 Styrene U 0.118 1.00 1 12/10/2024 11:25 WG2415667 1,1,1,2-Tetrachloroethane U 0.147 1.00 1 12/10/2024 11:25 WG2415667 1,1,2,2-Tetrachloroethane U 0.133 1.00 1 12/10/2024 11:25 WG2415667 1,1,2-Trichlorotrifluoroethane U 0.180 1.00 1 12/10/2024 11:25 WG2415667 Tetrachloroethene U 0.300 1.00 1 12/10/2024 11:25 WG2415667 Toluene U 0.278 1.00 1 12/10/2024 11:25 WG2415667 1,2,3-Trichlorobenzene U 0.230 1.00 1 12/10/2024 11:25 WG2415667 1,2,4-Trichlorobenzene U 0.481 1.00 1 12/10/2024 11:25 WG2415667 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 14 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 14 of 49 SAMPLE RESULTS - 04 L1805310 MW-12 Collected date/time: 12/03/24 11:00 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time 1,1,1-Trichloroethane U 0.149 1.00 1 12/10/2024 11:25 WG2415667 1,1,2-Trichloroethane U 0.158 1.00 1 12/10/2024 11:25 WG2415667 Trichloroethene U 0.190 1.00 1 12/10/2024 11:25 WG2415667 Trichlorofluoromethane 0.405 J 0.160 5.00 1 12/10/2024 11:25 WG2415667 1,2,3-Trichloropropane U 0.237 2.50 1 12/10/2024 11:25 WG2415667 1,2,4-Trimethylbenzene U 0.322 1.00 1 12/10/2024 11:25 WG2415667 1,2,3-Trimethylbenzene U 0.104 1.00 1 12/10/2024 11:25 WG2415667 1,3,5-Trimethylbenzene U 0.104 1.00 1 12/10/2024 11:25 WG2415667 Vinyl chloride U 0.234 1.00 1 12/10/2024 11:25 WG2415667 Xylenes, Total U 0.174 3.00 1 12/10/2024 11:25 WG2415667 (S) Toluene-d8 93.1 80.0-120 12/10/2024 11:25 WG2415667 (S) 4-Bromofluorobenzene 98.1 77.0-126 12/10/2024 11:25 WG2415667 (S) 1,2-Dichloroethane-d4 133 J1 70.0-130 12/10/2024 11:25 WG2415667 Semi Volatile Organic Compounds (GC/MS) by Method 8270C Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acenaphthene 0.198 J 0.0886 1.00 1 12/05/2024 03:02 WG2412414 Acenaphthylene 0.174 J 0.0921 1.00 1 12/05/2024 03:02 WG2412414 Anthracene U 0.0804 1.00 1 12/05/2024 03:02 WG2412414 Benzidine U J4 3.74 10.0 1 12/05/2024 03:02 WG2412414 Benzo(a)anthracene U 0.199 1.00 1 12/05/2024 03:02 WG2412414 Benzo(b)fluoranthene U 0.130 1.00 1 12/05/2024 03:02 WG2412414 Benzo(k)fluoranthene U 0.120 1.00 1 12/05/2024 03:02 WG2412414 Benzo(g,h,i)perylene U 0.121 1.00 1 12/05/2024 03:02 WG2412414 Benzo(a)pyrene U 0.0381 1.00 1 12/05/2024 03:02 WG2412414 Bis(2-chlorethoxy)methane U 0.116 10.0 1 12/05/2024 03:02 WG2412414 Bis(2-chloroethyl)ether U 0.137 10.0 1 12/05/2024 03:02 WG2412414 2,2-Oxybis(1-Chloropropane)U 0.210 10.0 1 12/05/2024 03:02 WG2412414 4-Bromophenyl-phenylether U 0.0877 10.0 1 12/05/2024 03:02 WG2412414 2-Chloronaphthalene U 0.0648 1.00 1 12/05/2024 03:02 WG2412414 4-Chlorophenyl-phenylether U 0.0926 10.0 1 12/05/2024 03:02 WG2412414 Chrysene U 0.130 1.00 1 12/05/2024 03:02 WG2412414 Dibenz(a,h)anthracene U 0.0644 1.00 1 12/05/2024 03:02 WG2412414 1,2-Dichlorobenzene U 0.0713 10.0 1 12/05/2024 03:02 WG2412414 1,3-Dichlorobenzene U 0.132 10.0 1 12/05/2024 03:02 WG2412414 1,4-Dichlorobenzene U 0.0942 10.0 1 12/05/2024 03:02 WG2412414 3,3-Dichlorobenzidine U 0.212 10.0 1 12/05/2024 03:02 WG2412414 2,4-Dinitrotoluene U 0.0983 10.0 1 12/05/2024 03:02 WG2412414 2,6-Dinitrotoluene U 0.250 10.0 1 12/05/2024 03:02 WG2412414 Fluoranthene U 0.102 1.00 1 12/05/2024 03:02 WG2412414 Fluorene 0.145 J 0.0844 1.00 1 12/05/2024 03:02 WG2412414 Hexachlorobenzene U 0.0755 1.00 1 12/05/2024 03:02 WG2412414 Hexachloro-1,3-butadiene U 0.0968 10.0 1 12/05/2024 03:02 WG2412414 Hexachlorocyclopentadiene U 0.0598 10.0 1 12/05/2024 03:02 WG2412414 Hexachloroethane U 0.127 10.0 1 12/05/2024 03:02 WG2412414 Indeno(1,2,3-cd)pyrene U 0.279 1.00 1 12/05/2024 03:02 WG2412414 Isophorone U 0.143 10.0 1 12/05/2024 03:02 WG2412414 Naphthalene 0.457 J 0.159 1.00 1 12/05/2024 03:02 WG2412414 Nitrobenzene U 0.297 10.0 1 12/05/2024 03:02 WG2412414 n-Nitrosodimethylamine U 0.998 10.0 1 12/05/2024 03:02 WG2412414 n-Nitrosodiphenylamine U 2.37 10.0 1 12/05/2024 03:02 WG2412414 n-Nitrosodi-n-propylamine U 0.261 10.0 1 12/05/2024 03:02 WG2412414 Phenanthrene 0.175 J 0.112 1.00 1 12/05/2024 03:02 WG2412414 Benzylbutyl phthalate U 0.765 3.00 1 12/05/2024 03:02 WG2412414 Bis(2-ethylhexyl)phthalate U 0.895 3.00 1 12/05/2024 03:02 WG2412414 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 15 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 15 of 49 SAMPLE RESULTS - 04 L1805310 MW-12 Collected date/time: 12/03/24 11:00 Semi Volatile Organic Compounds (GC/MS) by Method 8270C Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Di-n-butyl phthalate U 0.453 3.00 1 12/05/2024 03:02 WG2412414 Diethyl phthalate U 0.287 3.00 1 12/05/2024 03:02 WG2412414 Dimethyl phthalate U 0.260 3.00 1 12/05/2024 03:02 WG2412414 Di-n-octyl phthalate U 0.932 3.00 1 12/05/2024 03:02 WG2412414 Pyrene U 0.107 1.00 1 12/05/2024 03:02 WG2412414 1,2,4-Trichlorobenzene U 0.0698 10.0 1 12/05/2024 03:02 WG2412414 4-Chloro-3-methylphenol U 0.131 10.0 1 12/05/2024 03:02 WG2412414 2-Chlorophenol U 0.133 10.0 1 12/05/2024 03:02 WG2412414 2,4-Dichlorophenol U 0.102 10.0 1 12/05/2024 03:02 WG2412414 2,4-Dimethylphenol U 0.0636 10.0 1 12/05/2024 03:02 WG2412414 4,6-Dinitro-2-methylphenol U 1.12 10.0 1 12/05/2024 03:02 WG2412414 2,4-Dinitrophenol U 5.93 10.0 1 12/05/2024 03:02 WG2412414 2-Nitrophenol U 0.117 10.0 1 12/05/2024 03:02 WG2412414 4-Nitrophenol U 0.143 10.0 1 12/05/2024 03:02 WG2412414 Pentachlorophenol U 0.313 10.0 1 12/05/2024 03:02 WG2412414 Phenol U 4.33 10.0 1 12/05/2024 03:02 WG2412414 2,4,6-Trichlorophenol U 0.100 10.0 1 12/05/2024 03:02 WG2412414 (S) 2-Fluorophenol 23.6 10.0-120 12/05/2024 03:02 WG2412414 (S) Phenol-d5 15.8 10.0-120 12/05/2024 03:02 WG2412414 (S) Nitrobenzene-d5 43.9 10.0-127 12/05/2024 03:02 WG2412414 (S) 2-Fluorobiphenyl 50.1 10.0-130 12/05/2024 03:02 WG2412414 (S) 2,4,6-Tribromophenol 37.2 10.0-155 12/05/2024 03:02 WG2412414 (S) p-Terphenyl-d14 50.3 10.0-128 12/05/2024 03:02 WG2412414 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 16 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 16 of 49 SAMPLE RESULTS - 05 L1805310 MW-102 Collected date/time: 12/03/24 11:40 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acetone U 113 500 10 12/10/2024 16:27 WG2415667 Acrolein U J3 J4 25.4 500 10 12/10/2024 16:27 WG2415667 Acrylonitrile U J4 6.71 100 10 12/10/2024 16:27 WG2415667 Benzene 53.2 0.941 10.0 10 12/10/2024 16:27 WG2415667 Bromobenzene U 1.18 10.0 10 12/10/2024 16:27 WG2415667 Bromodichloromethane U 1.36 10.0 10 12/10/2024 16:27 WG2415667 Bromoform U 1.29 10.0 10 12/10/2024 16:27 WG2415667 Bromomethane U 6.05 50.0 10 12/10/2024 16:27 WG2415667 n-Butylbenzene U 1.57 10.0 10 12/10/2024 16:27 WG2415667 sec-Butylbenzene U 1.25 10.0 10 12/10/2024 16:27 WG2415667 tert-Butylbenzene U 1.27 10.0 10 12/10/2024 16:27 WG2415667 Carbon tetrachloride U 1.28 10.0 10 12/10/2024 16:27 WG2415667 Chlorobenzene U 1.16 10.0 10 12/10/2024 16:27 WG2415667 Chlorodibromomethane U 1.40 10.0 10 12/10/2024 16:27 WG2415667 Chloroethane U 1.92 50.0 10 12/10/2024 16:27 WG2415667 Chloroform U 1.11 50.0 10 12/10/2024 16:27 WG2415667 Chloromethane U 9.60 25.0 10 12/10/2024 16:27 WG2415667 2-Chlorotoluene U 1.06 10.0 10 12/10/2024 16:27 WG2415667 4-Chlorotoluene U 1.14 10.0 10 12/10/2024 16:27 WG2415667 1,2-Dibromo-3-Chloropropane U 2.76 50.0 10 12/10/2024 16:27 WG2415667 1,2-Dibromoethane U 1.26 10.0 10 12/10/2024 16:27 WG2415667 Dibromomethane U 1.22 10.0 10 12/10/2024 16:27 WG2415667 1,2-Dichlorobenzene U 1.07 10.0 10 12/10/2024 16:27 WG2415667 1,3-Dichlorobenzene U 1.10 10.0 10 12/10/2024 16:27 WG2415667 1,4-Dichlorobenzene U 1.20 10.0 10 12/10/2024 16:27 WG2415667 Dichlorodifluoromethane U 3.74 50.0 10 12/10/2024 16:27 WG2415667 1,1-Dichloroethane U 1.00 10.0 10 12/10/2024 16:27 WG2415667 1,2-Dichloroethane U 0.819 10.0 10 12/10/2024 16:27 WG2415667 1,1-Dichloroethene U 1.88 10.0 10 12/10/2024 16:27 WG2415667 cis-1,2-Dichloroethene U 1.26 10.0 10 12/10/2024 16:27 WG2415667 trans-1,2-Dichloroethene U 1.49 10.0 10 12/10/2024 16:27 WG2415667 1,2-Dichloropropane U 1.49 10.0 10 12/10/2024 16:27 WG2415667 1,1-Dichloropropene U 1.42 10.0 10 12/10/2024 16:27 WG2415667 1,3-Dichloropropane U 1.10 10.0 10 12/10/2024 16:27 WG2415667 cis-1,3-Dichloropropene U 1.11 10.0 10 12/10/2024 16:27 WG2415667 trans-1,3-Dichloropropene U 1.18 10.0 10 12/10/2024 16:27 WG2415667 2,2-Dichloropropane U 1.61 10.0 10 12/10/2024 16:27 WG2415667 Di-isopropyl ether U 1.05 10.0 10 12/10/2024 16:27 WG2415667 Ethylbenzene 195 1.37 10.0 10 12/10/2024 16:27 WG2415667 Hexachloro-1,3-butadiene U 3.37 10.0 10 12/10/2024 16:27 WG2415667 Isopropylbenzene 6.47 J 1.05 10.0 10 12/10/2024 16:27 WG2415667 p-Isopropyltoluene 5.65 J 1.20 10.0 10 12/10/2024 16:27 WG2415667 2-Butanone (MEK)U J4 11.9 100 10 12/10/2024 16:27 WG2415667 Methylene Chloride U 4.30 50.0 10 12/10/2024 16:27 WG2415667 4-Methyl-2-pentanone (MIBK)U 4.78 100 10 12/10/2024 16:27 WG2415667 Methyl tert-butyl ether U 1.01 10.0 10 12/10/2024 16:27 WG2415667 Naphthalene 238 10.0 50.0 10 12/10/2024 16:27 WG2415667 n-Propylbenzene 4.42 J 0.993 10.0 10 12/10/2024 16:27 WG2415667 Styrene U 1.18 10.0 10 12/10/2024 16:27 WG2415667 1,1,1,2-Tetrachloroethane U 1.47 10.0 10 12/10/2024 16:27 WG2415667 1,1,2,2-Tetrachloroethane U 1.33 10.0 10 12/10/2024 16:27 WG2415667 1,1,2-Trichlorotrifluoroethane U 1.80 10.0 10 12/10/2024 16:27 WG2415667 Tetrachloroethene U 3.00 10.0 10 12/10/2024 16:27 WG2415667 Toluene 89.7 2.78 10.0 10 12/10/2024 16:27 WG2415667 1,2,3-Trichlorobenzene U 2.30 10.0 10 12/10/2024 16:27 WG2415667 1,2,4-Trichlorobenzene U 4.81 10.0 10 12/10/2024 16:27 WG2415667 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 17 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 17 of 49 SAMPLE RESULTS - 05 L1805310 MW-102 Collected date/time: 12/03/24 11:40 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time 1,1,1-Trichloroethane U 1.49 10.0 10 12/10/2024 16:27 WG2415667 1,1,2-Trichloroethane U 1.58 10.0 10 12/10/2024 16:27 WG2415667 Trichloroethene U 1.90 10.0 10 12/10/2024 16:27 WG2415667 Trichlorofluoromethane U 1.60 50.0 10 12/10/2024 16:27 WG2415667 1,2,3-Trichloropropane U 2.37 25.0 10 12/10/2024 16:27 WG2415667 1,2,4-Trimethylbenzene 78.4 3.22 10.0 10 12/10/2024 16:27 WG2415667 1,2,3-Trimethylbenzene 34.3 1.04 10.0 10 12/10/2024 16:27 WG2415667 1,3,5-Trimethylbenzene 30.4 1.04 10.0 10 12/10/2024 16:27 WG2415667 Vinyl chloride U 2.34 10.0 10 12/10/2024 16:27 WG2415667 Xylenes, Total 197 1.74 30.0 10 12/10/2024 16:27 WG2415667 (S) Toluene-d8 95.1 80.0-120 12/10/2024 16:27 WG2415667 (S) 4-Bromofluorobenzene 100 77.0-126 12/10/2024 16:27 WG2415667 (S) 1,2-Dichloroethane-d4 116 70.0-130 12/10/2024 16:27 WG2415667 Semi Volatile Organic Compounds (GC/MS) by Method 8270C Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acenaphthene 117 0.0886 1.00 1 12/05/2024 03:24 WG2412414 Acenaphthylene 7.34 0.0921 1.00 1 12/05/2024 03:24 WG2412414 Anthracene 5.31 0.0804 1.00 1 12/05/2024 03:24 WG2412414 Benzidine U J4 3.74 10.0 1 12/05/2024 03:24 WG2412414 Benzo(a)anthracene U 0.199 1.00 1 12/05/2024 03:24 WG2412414 Benzo(b)fluoranthene U 0.130 1.00 1 12/05/2024 03:24 WG2412414 Benzo(k)fluoranthene U 0.120 1.00 1 12/05/2024 03:24 WG2412414 Benzo(g,h,i)perylene U 0.121 1.00 1 12/05/2024 03:24 WG2412414 Benzo(a)pyrene U 0.0381 1.00 1 12/05/2024 03:24 WG2412414 Bis(2-chlorethoxy)methane U 0.116 10.0 1 12/05/2024 03:24 WG2412414 Bis(2-chloroethyl)ether U 0.137 10.0 1 12/05/2024 03:24 WG2412414 2,2-Oxybis(1-Chloropropane)U 0.210 10.0 1 12/05/2024 03:24 WG2412414 4-Bromophenyl-phenylether U 0.0877 10.0 1 12/05/2024 03:24 WG2412414 2-Chloronaphthalene U 0.0648 1.00 1 12/05/2024 03:24 WG2412414 4-Chlorophenyl-phenylether U 0.0926 10.0 1 12/05/2024 03:24 WG2412414 Chrysene U 0.130 1.00 1 12/05/2024 03:24 WG2412414 Dibenz(a,h)anthracene U 0.0644 1.00 1 12/05/2024 03:24 WG2412414 1,2-Dichlorobenzene U 0.0713 10.0 1 12/05/2024 03:24 WG2412414 1,3-Dichlorobenzene U 0.132 10.0 1 12/05/2024 03:24 WG2412414 1,4-Dichlorobenzene U 0.0942 10.0 1 12/05/2024 03:24 WG2412414 3,3-Dichlorobenzidine U 0.212 10.0 1 12/05/2024 03:24 WG2412414 2,4-Dinitrotoluene U 0.0983 10.0 1 12/05/2024 03:24 WG2412414 2,6-Dinitrotoluene U 0.250 10.0 1 12/05/2024 03:24 WG2412414 Fluoranthene 1.80 0.102 1.00 1 12/05/2024 03:24 WG2412414 Fluorene 35.7 0.0844 1.00 1 12/05/2024 03:24 WG2412414 Hexachlorobenzene U 0.0755 1.00 1 12/05/2024 03:24 WG2412414 Hexachloro-1,3-butadiene U 0.0968 10.0 1 12/05/2024 03:24 WG2412414 Hexachlorocyclopentadiene U 0.0598 10.0 1 12/05/2024 03:24 WG2412414 Hexachloroethane U 0.127 10.0 1 12/05/2024 03:24 WG2412414 Indeno(1,2,3-cd)pyrene U 0.279 1.00 1 12/05/2024 03:24 WG2412414 Isophorone U 0.143 10.0 1 12/05/2024 03:24 WG2412414 Naphthalene 129 0.159 1.00 1 12/05/2024 03:24 WG2412414 Nitrobenzene U 0.297 10.0 1 12/05/2024 03:24 WG2412414 n-Nitrosodimethylamine U 0.998 10.0 1 12/05/2024 03:24 WG2412414 n-Nitrosodiphenylamine U 2.37 10.0 1 12/05/2024 03:24 WG2412414 n-Nitrosodi-n-propylamine U 0.261 10.0 1 12/05/2024 03:24 WG2412414 Phenanthrene 30.3 0.112 1.00 1 12/05/2024 03:24 WG2412414 Benzylbutyl phthalate U 0.765 3.00 1 12/05/2024 03:24 WG2412414 Bis(2-ethylhexyl)phthalate U 0.895 3.00 1 12/05/2024 03:24 WG2412414 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 18 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 18 of 49 SAMPLE RESULTS - 05 L1805310 MW-102 Collected date/time: 12/03/24 11:40 Semi Volatile Organic Compounds (GC/MS) by Method 8270C Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Di-n-butyl phthalate U 0.453 3.00 1 12/05/2024 03:24 WG2412414 Diethyl phthalate U 0.287 3.00 1 12/05/2024 03:24 WG2412414 Dimethyl phthalate U 0.260 3.00 1 12/05/2024 03:24 WG2412414 Di-n-octyl phthalate U 0.932 3.00 1 12/05/2024 03:24 WG2412414 Pyrene 2.00 0.107 1.00 1 12/05/2024 03:24 WG2412414 1,2,4-Trichlorobenzene U 0.0698 10.0 1 12/05/2024 03:24 WG2412414 4-Chloro-3-methylphenol U 0.131 10.0 1 12/05/2024 03:24 WG2412414 2-Chlorophenol U 0.133 10.0 1 12/05/2024 03:24 WG2412414 2,4-Dichlorophenol U 0.102 10.0 1 12/05/2024 03:24 WG2412414 2,4-Dimethylphenol U 0.0636 10.0 1 12/05/2024 03:24 WG2412414 4,6-Dinitro-2-methylphenol U 1.12 10.0 1 12/05/2024 03:24 WG2412414 2,4-Dinitrophenol U 5.93 10.0 1 12/05/2024 03:24 WG2412414 2-Nitrophenol U 0.117 10.0 1 12/05/2024 03:24 WG2412414 4-Nitrophenol U 0.143 10.0 1 12/05/2024 03:24 WG2412414 Pentachlorophenol U 0.313 10.0 1 12/05/2024 03:24 WG2412414 Phenol U 4.33 10.0 1 12/05/2024 03:24 WG2412414 2,4,6-Trichlorophenol U 0.100 10.0 1 12/05/2024 03:24 WG2412414 (S) 2-Fluorophenol 26.9 10.0-120 12/05/2024 03:24 WG2412414 (S) Phenol-d5 17.4 10.0-120 12/05/2024 03:24 WG2412414 (S) Nitrobenzene-d5 54.4 10.0-127 12/05/2024 03:24 WG2412414 (S) 2-Fluorobiphenyl 57.5 10.0-130 12/05/2024 03:24 WG2412414 (S) 2,4,6-Tribromophenol 45.0 10.0-155 12/05/2024 03:24 WG2412414 (S) p-Terphenyl-d14 57.2 10.0-128 12/05/2024 03:24 WG2412414 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 19 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 19 of 49 SAMPLE RESULTS - 06 L1805310 MW-101 Collected date/time: 12/03/24 12:30 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acetone U 226 1000 20 12/10/2024 16:45 WG2415667 Acrolein U J3 J4 50.8 1000 20 12/10/2024 16:45 WG2415667 Acrylonitrile U J4 13.4 200 20 12/10/2024 16:45 WG2415667 Benzene 103 1.88 20.0 20 12/10/2024 16:45 WG2415667 Bromobenzene U 2.36 20.0 20 12/10/2024 16:45 WG2415667 Bromodichloromethane U 2.72 20.0 20 12/10/2024 16:45 WG2415667 Bromoform U 2.58 20.0 20 12/10/2024 16:45 WG2415667 Bromomethane U 12.1 100 20 12/10/2024 16:45 WG2415667 n-Butylbenzene U 3.14 20.0 20 12/10/2024 16:45 WG2415667 sec-Butylbenzene U 2.50 20.0 20 12/10/2024 16:45 WG2415667 tert-Butylbenzene U 2.54 20.0 20 12/10/2024 16:45 WG2415667 Carbon tetrachloride U 2.56 20.0 20 12/10/2024 16:45 WG2415667 Chlorobenzene U 2.32 20.0 20 12/10/2024 16:45 WG2415667 Chlorodibromomethane U 2.80 20.0 20 12/10/2024 16:45 WG2415667 Chloroethane U 3.84 100 20 12/10/2024 16:45 WG2415667 Chloroform U 2.22 100 20 12/10/2024 16:45 WG2415667 Chloromethane U 19.2 50.0 20 12/10/2024 16:45 WG2415667 2-Chlorotoluene U 2.12 20.0 20 12/10/2024 16:45 WG2415667 4-Chlorotoluene U 2.28 20.0 20 12/10/2024 16:45 WG2415667 1,2-Dibromo-3-Chloropropane U 5.52 100 20 12/10/2024 16:45 WG2415667 1,2-Dibromoethane U 2.52 20.0 20 12/10/2024 16:45 WG2415667 Dibromomethane U 2.44 20.0 20 12/10/2024 16:45 WG2415667 1,2-Dichlorobenzene U 2.14 20.0 20 12/10/2024 16:45 WG2415667 1,3-Dichlorobenzene U 2.20 20.0 20 12/10/2024 16:45 WG2415667 1,4-Dichlorobenzene U 2.40 20.0 20 12/10/2024 16:45 WG2415667 Dichlorodifluoromethane U 7.48 100 20 12/10/2024 16:45 WG2415667 1,1-Dichloroethane U 2.00 20.0 20 12/10/2024 16:45 WG2415667 1,2-Dichloroethane U 1.64 20.0 20 12/10/2024 16:45 WG2415667 1,1-Dichloroethene U 3.76 20.0 20 12/10/2024 16:45 WG2415667 cis-1,2-Dichloroethene U 2.52 20.0 20 12/10/2024 16:45 WG2415667 trans-1,2-Dichloroethene U 2.98 20.0 20 12/10/2024 16:45 WG2415667 1,2-Dichloropropane U 2.98 20.0 20 12/10/2024 16:45 WG2415667 1,1-Dichloropropene U 2.84 20.0 20 12/10/2024 16:45 WG2415667 1,3-Dichloropropane U 2.20 20.0 20 12/10/2024 16:45 WG2415667 cis-1,3-Dichloropropene U 2.22 20.0 20 12/10/2024 16:45 WG2415667 trans-1,3-Dichloropropene U 2.36 20.0 20 12/10/2024 16:45 WG2415667 2,2-Dichloropropane U 3.22 20.0 20 12/10/2024 16:45 WG2415667 Di-isopropyl ether U 2.10 20.0 20 12/10/2024 16:45 WG2415667 Ethylbenzene 184 2.74 20.0 20 12/10/2024 16:45 WG2415667 Hexachloro-1,3-butadiene U 6.74 20.0 20 12/10/2024 16:45 WG2415667 Isopropylbenzene 18.9 J 2.10 20.0 20 12/10/2024 16:45 WG2415667 p-Isopropyltoluene 3.42 J 2.40 20.0 20 12/10/2024 16:45 WG2415667 2-Butanone (MEK)U J4 23.8 200 20 12/10/2024 16:45 WG2415667 Methylene Chloride U 8.60 100 20 12/10/2024 16:45 WG2415667 4-Methyl-2-pentanone (MIBK)U 9.56 200 20 12/10/2024 16:45 WG2415667 Methyl tert-butyl ether U 2.02 20.0 20 12/10/2024 16:45 WG2415667 Naphthalene 1110 20.0 100 20 12/10/2024 16:45 WG2415667 n-Propylbenzene 8.18 J 1.99 20.0 20 12/10/2024 16:45 WG2415667 Styrene U 2.36 20.0 20 12/10/2024 16:45 WG2415667 1,1,1,2-Tetrachloroethane U 2.94 20.0 20 12/10/2024 16:45 WG2415667 1,1,2,2-Tetrachloroethane U 2.66 20.0 20 12/10/2024 16:45 WG2415667 1,1,2-Trichlorotrifluoroethane U 3.60 20.0 20 12/10/2024 16:45 WG2415667 Tetrachloroethene U 6.00 20.0 20 12/10/2024 16:45 WG2415667 Toluene 17.1 J 5.56 20.0 20 12/10/2024 16:45 WG2415667 1,2,3-Trichlorobenzene U 4.60 20.0 20 12/10/2024 16:45 WG2415667 1,2,4-Trichlorobenzene U 9.62 20.0 20 12/10/2024 16:45 WG2415667 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 20 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 20 of 49 SAMPLE RESULTS - 06 L1805310 MW-101 Collected date/time: 12/03/24 12:30 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time 1,1,1-Trichloroethane U 2.98 20.0 20 12/10/2024 16:45 WG2415667 1,1,2-Trichloroethane U 3.16 20.0 20 12/10/2024 16:45 WG2415667 Trichloroethene U 3.80 20.0 20 12/10/2024 16:45 WG2415667 Trichlorofluoromethane U 3.20 100 20 12/10/2024 16:45 WG2415667 1,2,3-Trichloropropane U 4.74 50.0 20 12/10/2024 16:45 WG2415667 1,2,4-Trimethylbenzene 32.9 6.44 20.0 20 12/10/2024 16:45 WG2415667 1,2,3-Trimethylbenzene 23.6 2.08 20.0 20 12/10/2024 16:45 WG2415667 1,3,5-Trimethylbenzene 7.48 J 2.08 20.0 20 12/10/2024 16:45 WG2415667 Vinyl chloride U 4.68 20.0 20 12/10/2024 16:45 WG2415667 Xylenes, Total 121 3.48 60.0 20 12/10/2024 16:45 WG2415667 (S) Toluene-d8 94.8 80.0-120 12/10/2024 16:45 WG2415667 (S) 4-Bromofluorobenzene 98.8 77.0-126 12/10/2024 16:45 WG2415667 (S) 1,2-Dichloroethane-d4 116 70.0-130 12/10/2024 16:45 WG2415667 Semi Volatile Organic Compounds (GC/MS) by Method 8270C Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acenaphthene 196 0.0886 1.00 1 12/05/2024 03:46 WG2412414 Acenaphthylene 15.9 0.0921 1.00 1 12/05/2024 03:46 WG2412414 Anthracene 10.4 0.0804 1.00 1 12/05/2024 03:46 WG2412414 Benzidine U J4 3.74 10.0 1 12/05/2024 03:46 WG2412414 Benzo(a)anthracene U 0.199 1.00 1 12/05/2024 03:46 WG2412414 Benzo(b)fluoranthene U 0.130 1.00 1 12/05/2024 03:46 WG2412414 Benzo(k)fluoranthene U 0.120 1.00 1 12/05/2024 03:46 WG2412414 Benzo(g,h,i)perylene U 0.121 1.00 1 12/05/2024 03:46 WG2412414 Benzo(a)pyrene U 0.0381 1.00 1 12/05/2024 03:46 WG2412414 Bis(2-chlorethoxy)methane U 0.116 10.0 1 12/05/2024 03:46 WG2412414 Bis(2-chloroethyl)ether U 0.137 10.0 1 12/05/2024 03:46 WG2412414 2,2-Oxybis(1-Chloropropane)U 0.210 10.0 1 12/05/2024 03:46 WG2412414 4-Bromophenyl-phenylether U 0.0877 10.0 1 12/05/2024 03:46 WG2412414 2-Chloronaphthalene U 0.0648 1.00 1 12/05/2024 03:46 WG2412414 4-Chlorophenyl-phenylether U 0.0926 10.0 1 12/05/2024 03:46 WG2412414 Chrysene U 0.130 1.00 1 12/05/2024 03:46 WG2412414 Dibenz(a,h)anthracene U 0.0644 1.00 1 12/05/2024 03:46 WG2412414 1,2-Dichlorobenzene U 0.0713 10.0 1 12/05/2024 03:46 WG2412414 1,3-Dichlorobenzene U 0.132 10.0 1 12/05/2024 03:46 WG2412414 1,4-Dichlorobenzene U 0.0942 10.0 1 12/05/2024 03:46 WG2412414 3,3-Dichlorobenzidine U 0.212 10.0 1 12/05/2024 03:46 WG2412414 2,4-Dinitrotoluene U 0.0983 10.0 1 12/05/2024 03:46 WG2412414 2,6-Dinitrotoluene U 0.250 10.0 1 12/05/2024 03:46 WG2412414 Fluoranthene 4.01 0.102 1.00 1 12/05/2024 03:46 WG2412414 Fluorene 102 0.0844 1.00 1 12/05/2024 03:46 WG2412414 Hexachlorobenzene U 0.0755 1.00 1 12/05/2024 03:46 WG2412414 Hexachloro-1,3-butadiene U 0.0968 10.0 1 12/05/2024 03:46 WG2412414 Hexachlorocyclopentadiene U 0.0598 10.0 1 12/05/2024 03:46 WG2412414 Hexachloroethane U 0.127 10.0 1 12/05/2024 03:46 WG2412414 Indeno(1,2,3-cd)pyrene U 0.279 1.00 1 12/05/2024 03:46 WG2412414 Isophorone U 0.143 10.0 1 12/05/2024 03:46 WG2412414 Naphthalene 670 E 0.159 1.00 1 12/05/2024 03:46 WG2412414 Nitrobenzene U 0.297 10.0 1 12/05/2024 03:46 WG2412414 n-Nitrosodimethylamine U 0.998 10.0 1 12/05/2024 03:46 WG2412414 n-Nitrosodiphenylamine U 2.37 10.0 1 12/05/2024 03:46 WG2412414 n-Nitrosodi-n-propylamine U 0.261 10.0 1 12/05/2024 03:46 WG2412414 Phenanthrene 29.4 0.112 1.00 1 12/05/2024 03:46 WG2412414 Benzylbutyl phthalate U 0.765 3.00 1 12/05/2024 03:46 WG2412414 Bis(2-ethylhexyl)phthalate U 0.895 3.00 1 12/05/2024 03:46 WG2412414 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 21 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 21 of 49 SAMPLE RESULTS - 06 L1805310 MW-101 Collected date/time: 12/03/24 12:30 Semi Volatile Organic Compounds (GC/MS) by Method 8270C Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Di-n-butyl phthalate U 0.453 3.00 1 12/05/2024 03:46 WG2412414 Diethyl phthalate U 0.287 3.00 1 12/05/2024 03:46 WG2412414 Dimethyl phthalate U 0.260 3.00 1 12/05/2024 03:46 WG2412414 Di-n-octyl phthalate U 0.932 3.00 1 12/05/2024 03:46 WG2412414 Pyrene 3.52 0.107 1.00 1 12/05/2024 03:46 WG2412414 1,2,4-Trichlorobenzene U 0.0698 10.0 1 12/05/2024 03:46 WG2412414 4-Chloro-3-methylphenol U 0.131 10.0 1 12/05/2024 03:46 WG2412414 2-Chlorophenol U 0.133 10.0 1 12/05/2024 03:46 WG2412414 2,4-Dichlorophenol U 0.102 10.0 1 12/05/2024 03:46 WG2412414 2,4-Dimethylphenol 8.14 J 0.0636 10.0 1 12/05/2024 03:46 WG2412414 4,6-Dinitro-2-methylphenol U 1.12 10.0 1 12/05/2024 03:46 WG2412414 2,4-Dinitrophenol U 5.93 10.0 1 12/05/2024 03:46 WG2412414 2-Nitrophenol U 0.117 10.0 1 12/05/2024 03:46 WG2412414 4-Nitrophenol U 0.143 10.0 1 12/05/2024 03:46 WG2412414 Pentachlorophenol U 0.313 10.0 1 12/05/2024 03:46 WG2412414 Phenol U 4.33 10.0 1 12/05/2024 03:46 WG2412414 2,4,6-Trichlorophenol U 0.100 10.0 1 12/05/2024 03:46 WG2412414 (S) 2-Fluorophenol 31.8 10.0-120 12/05/2024 03:46 WG2412414 (S) Phenol-d5 20.3 10.0-120 12/05/2024 03:46 WG2412414 (S) Nitrobenzene-d5 58.8 10.0-127 12/05/2024 03:46 WG2412414 (S) 2-Fluorobiphenyl 63.0 10.0-130 12/05/2024 03:46 WG2412414 (S) 2,4,6-Tribromophenol 61.1 10.0-155 12/05/2024 03:46 WG2412414 (S) p-Terphenyl-d14 64.4 10.0-128 12/05/2024 03:46 WG2412414 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 22 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 22 of 49 SAMPLE RESULTS - 07 L1805310 MW-9101 Collected date/time: 12/03/24 12:35 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acetone U 1130 5000 100 12/10/2024 17:04 WG2415667 Acrolein U J3 J4 254 5000 100 12/10/2024 17:04 WG2415667 Acrylonitrile U J4 67.1 1000 100 12/10/2024 17:04 WG2415667 Benzene 93.9 J 9.41 100 100 12/10/2024 17:04 WG2415667 Bromobenzene U 11.8 100 100 12/10/2024 17:04 WG2415667 Bromodichloromethane U 13.6 100 100 12/10/2024 17:04 WG2415667 Bromoform U 12.9 100 100 12/10/2024 17:04 WG2415667 Bromomethane U 60.5 500 100 12/10/2024 17:04 WG2415667 n-Butylbenzene U 15.7 100 100 12/10/2024 17:04 WG2415667 sec-Butylbenzene U 12.5 100 100 12/10/2024 17:04 WG2415667 tert-Butylbenzene U 12.7 100 100 12/10/2024 17:04 WG2415667 Carbon tetrachloride U 12.8 100 100 12/10/2024 17:04 WG2415667 Chlorobenzene U 11.6 100 100 12/10/2024 17:04 WG2415667 Chlorodibromomethane U 14.0 100 100 12/10/2024 17:04 WG2415667 Chloroethane U 19.2 500 100 12/10/2024 17:04 WG2415667 Chloroform U 11.1 500 100 12/10/2024 17:04 WG2415667 Chloromethane U 96.0 250 100 12/10/2024 17:04 WG2415667 2-Chlorotoluene U 10.6 100 100 12/10/2024 17:04 WG2415667 4-Chlorotoluene U 11.4 100 100 12/10/2024 17:04 WG2415667 1,2-Dibromo-3-Chloropropane U 27.6 500 100 12/10/2024 17:04 WG2415667 1,2-Dibromoethane U 12.6 100 100 12/10/2024 17:04 WG2415667 Dibromomethane U 12.2 100 100 12/10/2024 17:04 WG2415667 1,2-Dichlorobenzene U 10.7 100 100 12/10/2024 17:04 WG2415667 1,3-Dichlorobenzene U 11.0 100 100 12/10/2024 17:04 WG2415667 1,4-Dichlorobenzene U 12.0 100 100 12/10/2024 17:04 WG2415667 Dichlorodifluoromethane U 37.4 500 100 12/10/2024 17:04 WG2415667 1,1-Dichloroethane U 10.0 100 100 12/10/2024 17:04 WG2415667 1,2-Dichloroethane U 8.19 100 100 12/10/2024 17:04 WG2415667 1,1-Dichloroethene U 18.8 100 100 12/10/2024 17:04 WG2415667 cis-1,2-Dichloroethene U 12.6 100 100 12/10/2024 17:04 WG2415667 trans-1,2-Dichloroethene U 14.9 100 100 12/10/2024 17:04 WG2415667 1,2-Dichloropropane U 14.9 100 100 12/10/2024 17:04 WG2415667 1,1-Dichloropropene U 14.2 100 100 12/10/2024 17:04 WG2415667 1,3-Dichloropropane U 11.0 100 100 12/10/2024 17:04 WG2415667 cis-1,3-Dichloropropene U 11.1 100 100 12/10/2024 17:04 WG2415667 trans-1,3-Dichloropropene U 11.8 100 100 12/10/2024 17:04 WG2415667 2,2-Dichloropropane U 16.1 100 100 12/10/2024 17:04 WG2415667 Di-isopropyl ether U 10.5 100 100 12/10/2024 17:04 WG2415667 Ethylbenzene 199 13.7 100 100 12/10/2024 17:04 WG2415667 Hexachloro-1,3-butadiene U 33.7 100 100 12/10/2024 17:04 WG2415667 Isopropylbenzene 23.2 J 10.5 100 100 12/10/2024 17:04 WG2415667 p-Isopropyltoluene U 12.0 100 100 12/10/2024 17:04 WG2415667 2-Butanone (MEK)U J4 119 1000 100 12/10/2024 17:04 WG2415667 Methylene Chloride U 43.0 500 100 12/10/2024 17:04 WG2415667 4-Methyl-2-pentanone (MIBK)U 47.8 1000 100 12/10/2024 17:04 WG2415667 Methyl tert-butyl ether U 10.1 100 100 12/10/2024 17:04 WG2415667 Naphthalene 1200 100 500 100 12/10/2024 17:04 WG2415667 n-Propylbenzene 10.8 J 9.93 100 100 12/10/2024 17:04 WG2415667 Styrene U 11.8 100 100 12/10/2024 17:04 WG2415667 1,1,1,2-Tetrachloroethane U 14.7 100 100 12/10/2024 17:04 WG2415667 1,1,2,2-Tetrachloroethane U 13.3 100 100 12/10/2024 17:04 WG2415667 1,1,2-Trichlorotrifluoroethane U 18.0 100 100 12/10/2024 17:04 WG2415667 Tetrachloroethene U 30.0 100 100 12/10/2024 17:04 WG2415667 Toluene U 27.8 100 100 12/10/2024 17:04 WG2415667 1,2,3-Trichlorobenzene U 23.0 100 100 12/10/2024 17:04 WG2415667 1,2,4-Trichlorobenzene U 48.1 100 100 12/10/2024 17:04 WG2415667 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 23 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 23 of 49 SAMPLE RESULTS - 07 L1805310 MW-9101 Collected date/time: 12/03/24 12:35 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time 1,1,1-Trichloroethane U 14.9 100 100 12/10/2024 17:04 WG2415667 1,1,2-Trichloroethane U 15.8 100 100 12/10/2024 17:04 WG2415667 Trichloroethene U 19.0 100 100 12/10/2024 17:04 WG2415667 Trichlorofluoromethane U 16.0 500 100 12/10/2024 17:04 WG2415667 1,2,3-Trichloropropane U 23.7 250 100 12/10/2024 17:04 WG2415667 1,2,4-Trimethylbenzene 34.8 J 32.2 100 100 12/10/2024 17:04 WG2415667 1,2,3-Trimethylbenzene 24.4 J 10.4 100 100 12/10/2024 17:04 WG2415667 1,3,5-Trimethylbenzene U 10.4 100 100 12/10/2024 17:04 WG2415667 Vinyl chloride U 23.4 100 100 12/10/2024 17:04 WG2415667 Xylenes, Total 117 J 17.4 300 100 12/10/2024 17:04 WG2415667 (S) Toluene-d8 96.1 80.0-120 12/10/2024 17:04 WG2415667 (S) 4-Bromofluorobenzene 97.7 77.0-126 12/10/2024 17:04 WG2415667 (S) 1,2-Dichloroethane-d4 110 70.0-130 12/10/2024 17:04 WG2415667 Semi Volatile Organic Compounds (GC/MS) by Method 8270C Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acenaphthene 156 0.0886 1.00 1 12/10/2024 17:58 WG2413151 Acenaphthylene 13.0 0.0921 1.00 1 12/10/2024 17:58 WG2413151 Anthracene 9.06 0.0804 1.00 1 12/10/2024 17:58 WG2413151 Benzidine U J4 3.74 10.0 1 12/10/2024 17:58 WG2413151 Benzo(a)anthracene U 0.199 1.00 1 12/10/2024 17:58 WG2413151 Benzo(b)fluoranthene U 0.130 1.00 1 12/10/2024 17:58 WG2413151 Benzo(k)fluoranthene U 0.120 1.00 1 12/10/2024 17:58 WG2413151 Benzo(g,h,i)perylene U 0.121 1.00 1 12/10/2024 17:58 WG2413151 Benzo(a)pyrene U 0.0381 1.00 1 12/10/2024 17:58 WG2413151 Bis(2-chlorethoxy)methane U 0.116 10.0 1 12/10/2024 17:58 WG2413151 Bis(2-chloroethyl)ether U 0.137 10.0 1 12/10/2024 17:58 WG2413151 2,2-Oxybis(1-Chloropropane)U 0.210 10.0 1 12/10/2024 17:58 WG2413151 4-Bromophenyl-phenylether U 0.0877 10.0 1 12/10/2024 17:58 WG2413151 2-Chloronaphthalene U 0.0648 1.00 1 12/10/2024 17:58 WG2413151 4-Chlorophenyl-phenylether U 0.0926 10.0 1 12/10/2024 17:58 WG2413151 Chrysene U 0.130 1.00 1 12/10/2024 17:58 WG2413151 Dibenz(a,h)anthracene U 0.0644 1.00 1 12/10/2024 17:58 WG2413151 1,2-Dichlorobenzene U 0.0713 10.0 1 12/10/2024 17:58 WG2413151 1,3-Dichlorobenzene U 0.132 10.0 1 12/10/2024 17:58 WG2413151 1,4-Dichlorobenzene U 0.0942 10.0 1 12/10/2024 17:58 WG2413151 3,3-Dichlorobenzidine U 0.212 10.0 1 12/10/2024 17:58 WG2413151 2,4-Dinitrotoluene U 0.0983 10.0 1 12/10/2024 17:58 WG2413151 2,6-Dinitrotoluene U 0.250 10.0 1 12/10/2024 17:58 WG2413151 Fluoranthene 3.81 0.102 1.00 1 12/10/2024 17:58 WG2413151 Fluorene 89.9 0.0844 1.00 1 12/10/2024 17:58 WG2413151 Hexachlorobenzene U 0.0755 1.00 1 12/10/2024 17:58 WG2413151 Hexachloro-1,3-butadiene U 0.0968 10.0 1 12/10/2024 17:58 WG2413151 Hexachlorocyclopentadiene U 0.0598 10.0 1 12/10/2024 17:58 WG2413151 Hexachloroethane U 0.127 10.0 1 12/10/2024 17:58 WG2413151 Indeno(1,2,3-cd)pyrene U 0.279 1.00 1 12/10/2024 17:58 WG2413151 Isophorone U 0.143 10.0 1 12/10/2024 17:58 WG2413151 Naphthalene 582 0.795 5.00 5 12/13/2024 21:05 WG2413151 Nitrobenzene U 0.297 10.0 1 12/10/2024 17:58 WG2413151 n-Nitrosodimethylamine U 0.998 10.0 1 12/10/2024 17:58 WG2413151 n-Nitrosodiphenylamine U 2.37 10.0 1 12/10/2024 17:58 WG2413151 n-Nitrosodi-n-propylamine U 0.261 10.0 1 12/10/2024 17:58 WG2413151 Phenanthrene 26.5 0.112 1.00 1 12/10/2024 17:58 WG2413151 Benzylbutyl phthalate U 0.765 3.00 1 12/10/2024 17:58 WG2413151 Bis(2-ethylhexyl)phthalate U 0.895 3.00 1 12/10/2024 17:58 WG2413151 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 24 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 24 of 49 SAMPLE RESULTS - 07 L1805310 MW-9101 Collected date/time: 12/03/24 12:35 Semi Volatile Organic Compounds (GC/MS) by Method 8270C Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Di-n-butyl phthalate U 0.453 3.00 1 12/10/2024 17:58 WG2413151 Diethyl phthalate U 0.287 3.00 1 12/10/2024 17:58 WG2413151 Dimethyl phthalate U 0.260 3.00 1 12/10/2024 17:58 WG2413151 Di-n-octyl phthalate U 0.932 3.00 1 12/10/2024 17:58 WG2413151 Pyrene 2.72 0.107 1.00 1 12/10/2024 17:58 WG2413151 1,2,4-Trichlorobenzene U 0.0698 10.0 1 12/10/2024 17:58 WG2413151 4-Chloro-3-methylphenol U 0.131 10.0 1 12/10/2024 17:58 WG2413151 2-Chlorophenol U 0.133 10.0 1 12/10/2024 17:58 WG2413151 2,4-Dichlorophenol U 0.102 10.0 1 12/10/2024 17:58 WG2413151 2,4-Dimethylphenol 7.85 J 0.0636 10.0 1 12/10/2024 17:58 WG2413151 4,6-Dinitro-2-methylphenol U 1.12 10.0 1 12/10/2024 17:58 WG2413151 2,4-Dinitrophenol U 5.93 10.0 1 12/10/2024 17:58 WG2413151 2-Nitrophenol U 0.117 10.0 1 12/10/2024 17:58 WG2413151 4-Nitrophenol U 0.143 10.0 1 12/10/2024 17:58 WG2413151 Pentachlorophenol U 0.313 10.0 1 12/10/2024 17:58 WG2413151 Phenol U 4.33 10.0 1 12/10/2024 17:58 WG2413151 2,4,6-Trichlorophenol U 0.100 10.0 1 12/10/2024 17:58 WG2413151 (S) 2-Fluorophenol 25.5 10.0-120 12/10/2024 17:58 WG2413151 (S) 2-Fluorophenol 24.7 10.0-120 12/13/2024 21:05 WG2413151 (S) Phenol-d5 14.1 10.0-120 12/13/2024 21:05 WG2413151 (S) Phenol-d5 14.5 10.0-120 12/10/2024 17:58 WG2413151 (S) Nitrobenzene-d5 35.7 10.0-127 12/13/2024 21:05 WG2413151 (S) Nitrobenzene-d5 53.8 10.0-127 12/10/2024 17:58 WG2413151 (S) 2-Fluorobiphenyl 35.7 10.0-130 12/13/2024 21:05 WG2413151 (S) 2-Fluorobiphenyl 55.6 10.0-130 12/10/2024 17:58 WG2413151 (S) 2,4,6-Tribromophenol 50.9 10.0-155 12/10/2024 17:58 WG2413151 (S) 2,4,6-Tribromophenol 45.4 10.0-155 12/13/2024 21:05 WG2413151 (S) p-Terphenyl-d14 48.5 10.0-128 12/10/2024 17:58 WG2413151 (S) p-Terphenyl-d14 34.7 10.0-128 12/13/2024 21:05 WG2413151 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 25 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 25 of 49 SAMPLE RESULTS - 08 L1805310 SW-1 Collected date/time: 12/03/24 14:00 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acetone U 11.3 50.0 1 12/10/2024 11:44 WG2415667 Acrolein U J3 J4 2.54 50.0 1 12/10/2024 11:44 WG2415667 Acrylonitrile U J4 0.671 10.0 1 12/10/2024 11:44 WG2415667 Benzene 12.2 0.0941 1.00 1 12/10/2024 11:44 WG2415667 Bromobenzene U 0.118 1.00 1 12/10/2024 11:44 WG2415667 Bromodichloromethane U 0.136 1.00 1 12/10/2024 11:44 WG2415667 Bromoform U 0.129 1.00 1 12/10/2024 11:44 WG2415667 Bromomethane U 0.605 5.00 1 12/10/2024 11:44 WG2415667 n-Butylbenzene 0.186 J 0.157 1.00 1 12/10/2024 11:44 WG2415667 sec-Butylbenzene 0.439 J 0.125 1.00 1 12/10/2024 11:44 WG2415667 tert-Butylbenzene 0.155 J 0.127 1.00 1 12/10/2024 11:44 WG2415667 Carbon tetrachloride U 0.128 1.00 1 12/10/2024 11:44 WG2415667 Chlorobenzene U 0.116 1.00 1 12/10/2024 11:44 WG2415667 Chlorodibromomethane U 0.140 1.00 1 12/10/2024 11:44 WG2415667 Chloroethane U 0.192 5.00 1 12/10/2024 11:44 WG2415667 Chloroform U 0.111 5.00 1 12/10/2024 11:44 WG2415667 Chloromethane U 0.960 2.50 1 12/10/2024 11:44 WG2415667 2-Chlorotoluene U 0.106 1.00 1 12/10/2024 11:44 WG2415667 4-Chlorotoluene U 0.114 1.00 1 12/10/2024 11:44 WG2415667 1,2-Dibromo-3-Chloropropane U 0.276 5.00 1 12/10/2024 11:44 WG2415667 1,2-Dibromoethane U 0.126 1.00 1 12/10/2024 11:44 WG2415667 Dibromomethane U 0.122 1.00 1 12/10/2024 11:44 WG2415667 1,2-Dichlorobenzene U 0.107 1.00 1 12/10/2024 11:44 WG2415667 1,3-Dichlorobenzene U 0.110 1.00 1 12/10/2024 11:44 WG2415667 1,4-Dichlorobenzene U 0.120 1.00 1 12/10/2024 11:44 WG2415667 Dichlorodifluoromethane U 0.374 5.00 1 12/10/2024 11:44 WG2415667 1,1-Dichloroethane U 0.100 1.00 1 12/10/2024 11:44 WG2415667 1,2-Dichloroethane U 0.0819 1.00 1 12/10/2024 11:44 WG2415667 1,1-Dichloroethene U 0.188 1.00 1 12/10/2024 11:44 WG2415667 cis-1,2-Dichloroethene U 0.126 1.00 1 12/10/2024 11:44 WG2415667 trans-1,2-Dichloroethene U 0.149 1.00 1 12/10/2024 11:44 WG2415667 1,2-Dichloropropane U 0.149 1.00 1 12/10/2024 11:44 WG2415667 1,1-Dichloropropene U 0.142 1.00 1 12/10/2024 11:44 WG2415667 1,3-Dichloropropane U 0.110 1.00 1 12/10/2024 11:44 WG2415667 cis-1,3-Dichloropropene U 0.111 1.00 1 12/10/2024 11:44 WG2415667 trans-1,3-Dichloropropene U 0.118 1.00 1 12/10/2024 11:44 WG2415667 2,2-Dichloropropane U 0.161 1.00 1 12/10/2024 11:44 WG2415667 Di-isopropyl ether U 0.105 1.00 1 12/10/2024 11:44 WG2415667 Ethylbenzene 6.94 0.137 1.00 1 12/10/2024 11:44 WG2415667 Hexachloro-1,3-butadiene U 0.337 1.00 1 12/10/2024 11:44 WG2415667 Isopropylbenzene 2.54 0.105 1.00 1 12/10/2024 11:44 WG2415667 p-Isopropyltoluene 0.525 J 0.120 1.00 1 12/10/2024 11:44 WG2415667 2-Butanone (MEK)U J4 1.19 10.0 1 12/10/2024 11:44 WG2415667 Methylene Chloride U 0.430 5.00 1 12/10/2024 11:44 WG2415667 4-Methyl-2-pentanone (MIBK)U 0.478 10.0 1 12/10/2024 11:44 WG2415667 Methyl tert-butyl ether U 0.101 1.00 1 12/10/2024 11:44 WG2415667 Naphthalene U 1.00 5.00 1 12/10/2024 11:44 WG2415667 n-Propylbenzene 0.616 J 0.0993 1.00 1 12/10/2024 11:44 WG2415667 Styrene U 0.118 1.00 1 12/10/2024 11:44 WG2415667 1,1,1,2-Tetrachloroethane U 0.147 1.00 1 12/10/2024 11:44 WG2415667 1,1,2,2-Tetrachloroethane U 0.133 1.00 1 12/10/2024 11:44 WG2415667 1,1,2-Trichlorotrifluoroethane U 0.180 1.00 1 12/10/2024 11:44 WG2415667 Tetrachloroethene U 0.300 1.00 1 12/10/2024 11:44 WG2415667 Toluene U 0.278 1.00 1 12/10/2024 11:44 WG2415667 1,2,3-Trichlorobenzene U 0.230 1.00 1 12/10/2024 11:44 WG2415667 1,2,4-Trichlorobenzene U 0.481 1.00 1 12/10/2024 11:44 WG2415667 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 26 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 26 of 49 SAMPLE RESULTS - 08 L1805310 SW-1 Collected date/time: 12/03/24 14:00 Volatile Organic Compounds (GC/MS) by Method 8260B Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time 1,1,1-Trichloroethane U 0.149 1.00 1 12/10/2024 11:44 WG2415667 1,1,2-Trichloroethane U 0.158 1.00 1 12/10/2024 11:44 WG2415667 Trichloroethene U 0.190 1.00 1 12/10/2024 11:44 WG2415667 Trichlorofluoromethane U 0.160 5.00 1 12/10/2024 11:44 WG2415667 1,2,3-Trichloropropane U 0.237 2.50 1 12/10/2024 11:44 WG2415667 1,2,4-Trimethylbenzene U 0.322 1.00 1 12/10/2024 11:44 WG2415667 1,2,3-Trimethylbenzene 0.200 J 0.104 1.00 1 12/10/2024 11:44 WG2415667 1,3,5-Trimethylbenzene U 0.104 1.00 1 12/10/2024 11:44 WG2415667 Vinyl chloride U 0.234 1.00 1 12/10/2024 11:44 WG2415667 Xylenes, Total 2.12 J 0.174 3.00 1 12/10/2024 11:44 WG2415667 (S) Toluene-d8 95.3 80.0-120 12/10/2024 11:44 WG2415667 (S) 4-Bromofluorobenzene 98.9 77.0-126 12/10/2024 11:44 WG2415667 (S) 1,2-Dichloroethane-d4 119 70.0-130 12/10/2024 11:44 WG2415667 Semi Volatile Organic Compounds (GC/MS) by Method 8270C Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acenaphthene 150 0.0886 1.00 1 12/10/2024 18:20 WG2413151 Acenaphthylene 8.66 0.0921 1.00 1 12/10/2024 18:20 WG2413151 Anthracene 7.35 0.0804 1.00 1 12/10/2024 18:20 WG2413151 Benzidine U J4 3.74 10.0 1 12/10/2024 18:20 WG2413151 Benzo(a)anthracene U 0.199 1.00 1 12/10/2024 18:20 WG2413151 Benzo(b)fluoranthene U 0.130 1.00 1 12/10/2024 18:20 WG2413151 Benzo(k)fluoranthene U 0.120 1.00 1 12/10/2024 18:20 WG2413151 Benzo(g,h,i)perylene U 0.121 1.00 1 12/10/2024 18:20 WG2413151 Benzo(a)pyrene U 0.0381 1.00 1 12/10/2024 18:20 WG2413151 Bis(2-chlorethoxy)methane U 0.116 10.0 1 12/10/2024 18:20 WG2413151 Bis(2-chloroethyl)ether U 0.137 10.0 1 12/10/2024 18:20 WG2413151 2,2-Oxybis(1-Chloropropane)U 0.210 10.0 1 12/10/2024 18:20 WG2413151 4-Bromophenyl-phenylether U 0.0877 10.0 1 12/10/2024 18:20 WG2413151 2-Chloronaphthalene U 0.0648 1.00 1 12/10/2024 18:20 WG2413151 4-Chlorophenyl-phenylether U 0.0926 10.0 1 12/10/2024 18:20 WG2413151 Chrysene U 0.130 1.00 1 12/10/2024 18:20 WG2413151 Dibenz(a,h)anthracene U 0.0644 1.00 1 12/10/2024 18:20 WG2413151 1,2-Dichlorobenzene U 0.0713 10.0 1 12/10/2024 18:20 WG2413151 1,3-Dichlorobenzene U 0.132 10.0 1 12/10/2024 18:20 WG2413151 1,4-Dichlorobenzene U 0.0942 10.0 1 12/10/2024 18:20 WG2413151 3,3-Dichlorobenzidine U 0.212 10.0 1 12/10/2024 18:20 WG2413151 2,4-Dinitrotoluene U 0.0983 10.0 1 12/10/2024 18:20 WG2413151 2,6-Dinitrotoluene U 0.250 10.0 1 12/10/2024 18:20 WG2413151 Fluoranthene 2.91 0.102 1.00 1 12/10/2024 18:20 WG2413151 Fluorene 28.3 0.0844 1.00 1 12/10/2024 18:20 WG2413151 Hexachlorobenzene U 0.0755 1.00 1 12/10/2024 18:20 WG2413151 Hexachloro-1,3-butadiene U 0.0968 10.0 1 12/10/2024 18:20 WG2413151 Hexachlorocyclopentadiene U 0.0598 10.0 1 12/10/2024 18:20 WG2413151 Hexachloroethane U 0.127 10.0 1 12/10/2024 18:20 WG2413151 Indeno(1,2,3-cd)pyrene U 0.279 1.00 1 12/10/2024 18:20 WG2413151 Isophorone U 0.143 10.0 1 12/10/2024 18:20 WG2413151 Naphthalene 0.940 J 0.159 1.00 1 12/10/2024 18:20 WG2413151 Nitrobenzene U 0.297 10.0 1 12/10/2024 18:20 WG2413151 n-Nitrosodimethylamine U 0.998 10.0 1 12/10/2024 18:20 WG2413151 n-Nitrosodiphenylamine U 2.37 10.0 1 12/10/2024 18:20 WG2413151 n-Nitrosodi-n-propylamine U 0.261 10.0 1 12/10/2024 18:20 WG2413151 Phenanthrene 0.610 J 0.112 1.00 1 12/10/2024 18:20 WG2413151 Benzylbutyl phthalate U 0.765 3.00 1 12/10/2024 18:20 WG2413151 Bis(2-ethylhexyl)phthalate U 0.895 3.00 1 12/10/2024 18:20 WG2413151 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 27 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 27 of 49 SAMPLE RESULTS - 08 L1805310 SW-1 Collected date/time: 12/03/24 14:00 Semi Volatile Organic Compounds (GC/MS) by Method 8270C Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Di-n-butyl phthalate U 0.453 3.00 1 12/10/2024 18:20 WG2413151 Diethyl phthalate U 0.287 3.00 1 12/10/2024 18:20 WG2413151 Dimethyl phthalate U 0.260 3.00 1 12/10/2024 18:20 WG2413151 Di-n-octyl phthalate U 0.932 3.00 1 12/10/2024 18:20 WG2413151 Pyrene 2.92 0.107 1.00 1 12/10/2024 18:20 WG2413151 1,2,4-Trichlorobenzene U 0.0698 10.0 1 12/10/2024 18:20 WG2413151 4-Chloro-3-methylphenol U 0.131 10.0 1 12/10/2024 18:20 WG2413151 2-Chlorophenol U 0.133 10.0 1 12/10/2024 18:20 WG2413151 2,4-Dichlorophenol U 0.102 10.0 1 12/10/2024 18:20 WG2413151 2,4-Dimethylphenol U 0.0636 10.0 1 12/10/2024 18:20 WG2413151 4,6-Dinitro-2-methylphenol U 1.12 10.0 1 12/10/2024 18:20 WG2413151 2,4-Dinitrophenol U 5.93 10.0 1 12/10/2024 18:20 WG2413151 2-Nitrophenol U 0.117 10.0 1 12/10/2024 18:20 WG2413151 4-Nitrophenol U 0.143 10.0 1 12/10/2024 18:20 WG2413151 Pentachlorophenol U 0.313 10.0 1 12/10/2024 18:20 WG2413151 Phenol U 4.33 10.0 1 12/10/2024 18:20 WG2413151 2,4,6-Trichlorophenol U 0.100 10.0 1 12/10/2024 18:20 WG2413151 (S) 2-Fluorophenol 24.7 10.0-120 12/10/2024 18:20 WG2413151 (S) Phenol-d5 14.0 10.0-120 12/10/2024 18:20 WG2413151 (S) Nitrobenzene-d5 60.2 10.0-127 12/10/2024 18:20 WG2413151 (S) 2-Fluorobiphenyl 77.8 10.0-130 12/10/2024 18:20 WG2413151 (S) 2,4,6-Tribromophenol 81.3 10.0-155 12/10/2024 18:20 WG2413151 (S) p-Terphenyl-d14 72.0 10.0-128 12/10/2024 18:20 WG2413151 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 28 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 28 of 49 QUALITY CONTROL SUMMARYWG2414765 Volatile Organic Compounds (GC/MS) by Method 8260B L1805310-01,02 Method Blank (MB) (MB) R4156454-2 12/07/24 11:13 MB Result MB Qualifier MB MDL MB RDL Analyte ug/l ug/l ug/l Acetone U 11.3 50.0 Acrolein U 2.54 50.0 Acrylonitrile U 0.671 10.0 Benzene U 0.0941 1.00 Bromobenzene U 0.118 1.00 Bromodichloromethane U 0.136 1.00 Bromoform U 0.129 1.00 Bromomethane U 0.605 5.00 n-Butylbenzene U 0.157 1.00 sec-Butylbenzene U 0.125 1.00 tert-Butylbenzene U 0.127 1.00 Carbon tetrachloride U 0.128 1.00 Chlorobenzene U 0.116 1.00 Chlorodibromomethane U 0.140 1.00 Chloroethane U 0.192 5.00 Chloroform U 0.111 5.00 Chloromethane U 0.960 2.50 2-Chlorotoluene U 0.106 1.00 4-Chlorotoluene U 0.114 1.00 1,2-Dibromo-3-Chloropropane U 0.276 5.00 1,2-Dibromoethane U 0.126 1.00 Dibromomethane U 0.122 1.00 1,2-Dichlorobenzene U 0.107 1.00 1,3-Dichlorobenzene U 0.110 1.00 1,4-Dichlorobenzene U 0.120 1.00 Dichlorodifluoromethane U 0.374 5.00 1,1-Dichloroethane U 0.100 1.00 1,2-Dichloroethane U 0.0819 1.00 1,1-Dichloroethene U 0.188 1.00 cis-1,2-Dichloroethene U 0.126 1.00 trans-1,2-Dichloroethene U 0.149 1.00 1,2-Dichloropropane U 0.149 1.00 1,1-Dichloropropene U 0.142 1.00 1,3-Dichloropropane U 0.110 1.00 cis-1,3-Dichloropropene U 0.111 1.00 trans-1,3-Dichloropropene U 0.118 1.00 2,2-Dichloropropane U 0.161 1.00 Di-isopropyl ether U 0.105 1.00 Ethylbenzene U 0.137 1.00 Hexachloro-1,3-butadiene U 0.337 1.00 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 29 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 29 of 49 QUALITY CONTROL SUMMARYWG2414765 Volatile Organic Compounds (GC/MS) by Method 8260B L1805310-01,02 Method Blank (MB) (MB) R4156454-2 12/07/24 11:13 MB Result MB Qualifier MB MDL MB RDL Analyte ug/l ug/l ug/l Isopropylbenzene U 0.105 1.00 p-Isopropyltoluene U 0.120 1.00 2-Butanone (MEK)U 1.19 10.0 Methylene Chloride U 0.430 5.00 4-Methyl-2-pentanone (MIBK)U 0.478 10.0 Methyl tert-butyl ether U 0.101 1.00 Naphthalene U 1.00 5.00 n-Propylbenzene U 0.0993 1.00 Styrene U 0.118 1.00 1,1,1,2-Tetrachloroethane U 0.147 1.00 1,1,2,2-Tetrachloroethane U 0.133 1.00 1,1,2-Trichlorotrifluoroethane U 0.180 1.00 Tetrachloroethene U 0.300 1.00 Toluene U 0.278 1.00 1,2,3-Trichlorobenzene U 0.230 1.00 1,2,4-Trichlorobenzene U 0.481 1.00 1,1,1-Trichloroethane U 0.149 1.00 1,1,2-Trichloroethane U 0.158 1.00 Trichloroethene U 0.190 1.00 Trichlorofluoromethane U 0.160 5.00 1,2,3-Trichloropropane U 0.237 2.50 1,2,4-Trimethylbenzene U 0.322 1.00 1,2,3-Trimethylbenzene U 0.104 1.00 1,3,5-Trimethylbenzene U 0.104 1.00 Vinyl chloride U 0.234 1.00 Xylenes, Total U 0.174 3.00 (S) Toluene-d8 96.7 80.0-120 (S) 4-Bromofluorobenzene 96.8 77.0-126 (S) 1,2-Dichloroethane-d4 117 70.0-130 Laboratory Control Sample (LCS) (LCS) R4156454-1 12/07/24 10:35 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte ug/l ug/l %% Acetone 25.0 31.6 126 19.0-160 J Acrolein 25.0 3.92 15.7 10.0-160 J Acrylonitrile 25.0 38.4 154 55.0-149 J4 Benzene 5.00 4.56 91.2 70.0-123 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 30 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 30 of 49 QUALITY CONTROL SUMMARYWG2414765 Volatile Organic Compounds (GC/MS) by Method 8260B L1805310-01,02 Laboratory Control Sample (LCS) (LCS) R4156454-1 12/07/24 10:35 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte ug/l ug/l %% Bromobenzene 5.00 5.44 109 73.0-121 Bromodichloromethane 5.00 5.11 102 75.0-120 Bromoform 5.00 5.95 119 68.0-132 Bromomethane 5.00 4.08 81.6 10.0-160 J n-Butylbenzene 5.00 4.84 96.8 73.0-125 sec-Butylbenzene 5.00 5.12 102 75.0-125 tert-Butylbenzene 5.00 4.96 99.2 76.0-124 Carbon tetrachloride 5.00 6.54 131 68.0-126 J4 Chlorobenzene 5.00 5.32 106 80.0-121 Chlorodibromomethane 5.00 5.25 105 77.0-125 Chloroethane 5.00 5.12 102 47.0-150 Chloroform 5.00 4.93 98.6 73.0-120 J Chloromethane 5.00 6.94 139 41.0-142 2-Chlorotoluene 5.00 4.99 99.8 76.0-123 4-Chlorotoluene 5.00 4.89 97.8 75.0-122 1,2-Dibromo-3-Chloropropane 5.00 5.74 115 58.0-134 1,2-Dibromoethane 5.00 5.40 108 80.0-122 Dibromomethane 5.00 5.16 103 80.0-120 1,2-Dichlorobenzene 5.00 5.23 105 79.0-121 1,3-Dichlorobenzene 5.00 5.14 103 79.0-120 1,4-Dichlorobenzene 5.00 5.15 103 79.0-120 Dichlorodifluoromethane 5.00 4.74 94.8 51.0-149 J 1,1-Dichloroethane 5.00 4.36 87.2 70.0-126 1,2-Dichloroethane 5.00 5.36 107 70.0-128 1,1-Dichloroethene 5.00 4.27 85.4 71.0-124 cis-1,2-Dichloroethene 5.00 4.72 94.4 73.0-120 trans-1,2-Dichloroethene 5.00 4.46 89.2 73.0-120 1,2-Dichloropropane 5.00 4.85 97.0 77.0-125 1,1-Dichloropropene 5.00 4.61 92.2 74.0-126 1,3-Dichloropropane 5.00 5.56 111 80.0-120 cis-1,3-Dichloropropene 5.00 4.68 93.6 80.0-123 trans-1,3-Dichloropropene 5.00 5.03 101 78.0-124 2,2-Dichloropropane 5.00 5.67 113 58.0-130 Di-isopropyl ether 5.00 4.47 89.4 58.0-138 Ethylbenzene 5.00 4.99 99.8 79.0-123 Hexachloro-1,3-butadiene 5.00 4.84 96.8 54.0-138 Isopropylbenzene 5.00 5.28 106 76.0-127 p-Isopropyltoluene 5.00 4.93 98.6 76.0-125 2-Butanone (MEK)25.0 39.9 160 44.0-160 Methylene Chloride 5.00 3.99 79.8 67.0-120 J 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 31 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 31 of 49 QUALITY CONTROL SUMMARYWG2414765 Volatile Organic Compounds (GC/MS) by Method 8260B L1805310-01,02 Laboratory Control Sample (LCS) (LCS) R4156454-1 12/07/24 10:35 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte ug/l ug/l %% 4-Methyl-2-pentanone (MIBK)25.0 33.2 133 68.0-142 Methyl tert-butyl ether 5.00 4.85 97.0 68.0-125 Naphthalene 5.00 3.87 77.4 54.0-135 J n-Propylbenzene 5.00 5.18 104 77.0-124 Styrene 5.00 4.90 98.0 73.0-130 1,1,1,2-Tetrachloroethane 5.00 5.01 100 75.0-125 1,1,2,2-Tetrachloroethane 5.00 5.24 105 65.0-130 1,1,2-Trichlorotrifluoroethane 5.00 4.09 81.8 69.0-132 Tetrachloroethene 5.00 5.77 115 72.0-132 Toluene 5.00 4.92 98.4 79.0-120 1,2,3-Trichlorobenzene 5.00 4.26 85.2 50.0-138 1,2,4-Trichlorobenzene 5.00 4.18 83.6 57.0-137 1,1,1-Trichloroethane 5.00 5.37 107 73.0-124 1,1,2-Trichloroethane 5.00 4.93 98.6 80.0-120 Trichloroethene 5.00 5.06 101 78.0-124 Trichlorofluoromethane 5.00 4.57 91.4 59.0-147 J 1,2,3-Trichloropropane 5.00 5.94 119 73.0-130 1,2,4-Trimethylbenzene 5.00 4.88 97.6 76.0-121 1,2,3-Trimethylbenzene 5.00 4.69 93.8 77.0-120 1,3,5-Trimethylbenzene 5.00 5.02 100 76.0-122 Vinyl chloride 5.00 5.15 103 67.0-131 Xylenes, Total 15.0 15.2 101 79.0-123 (S) Toluene-d8 96.7 80.0-120 (S) 4-Bromofluorobenzene 101 77.0-126 (S) 1,2-Dichloroethane-d4 115 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: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 32 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 32 of 49 QUALITY CONTROL SUMMARYWG2415667 Volatile Organic Compounds (GC/MS) by Method 8260B L1805310-03,04,05,06,07,08 Method Blank (MB) (MB) R4156417-3 12/10/24 10:19 MB Result MB Qualifier MB MDL MB RDL Analyte ug/l ug/l ug/l Acetone U 11.3 50.0 Acrolein U 2.54 50.0 Acrylonitrile U 0.671 10.0 Benzene U 0.0941 1.00 Bromobenzene U 0.118 1.00 Bromodichloromethane U 0.136 1.00 Bromoform U 0.129 1.00 Bromomethane U 0.605 5.00 n-Butylbenzene U 0.157 1.00 sec-Butylbenzene U 0.125 1.00 tert-Butylbenzene U 0.127 1.00 Carbon tetrachloride U 0.128 1.00 Chlorobenzene U 0.116 1.00 Chlorodibromomethane U 0.140 1.00 Chloroethane U 0.192 5.00 Chloroform U 0.111 5.00 Chloromethane U 0.960 2.50 2-Chlorotoluene U 0.106 1.00 4-Chlorotoluene U 0.114 1.00 1,2-Dibromo-3-Chloropropane U 0.276 5.00 1,2-Dibromoethane U 0.126 1.00 Dibromomethane U 0.122 1.00 1,2-Dichlorobenzene U 0.107 1.00 1,3-Dichlorobenzene U 0.110 1.00 1,4-Dichlorobenzene U 0.120 1.00 Dichlorodifluoromethane U 0.374 5.00 1,1-Dichloroethane U 0.100 1.00 1,2-Dichloroethane U 0.0819 1.00 1,1-Dichloroethene U 0.188 1.00 cis-1,2-Dichloroethene U 0.126 1.00 trans-1,2-Dichloroethene U 0.149 1.00 1,2-Dichloropropane U 0.149 1.00 1,1-Dichloropropene U 0.142 1.00 1,3-Dichloropropane U 0.110 1.00 cis-1,3-Dichloropropene U 0.111 1.00 trans-1,3-Dichloropropene U 0.118 1.00 2,2-Dichloropropane U 0.161 1.00 Di-isopropyl ether U 0.105 1.00 Ethylbenzene U 0.137 1.00 Hexachloro-1,3-butadiene U 0.337 1.00 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 33 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 33 of 49 QUALITY CONTROL SUMMARYWG2415667 Volatile Organic Compounds (GC/MS) by Method 8260B L1805310-03,04,05,06,07,08 Method Blank (MB) (MB) R4156417-3 12/10/24 10:19 MB Result MB Qualifier MB MDL MB RDL Analyte ug/l ug/l ug/l Isopropylbenzene U 0.105 1.00 p-Isopropyltoluene U 0.120 1.00 2-Butanone (MEK)U 1.19 10.0 Methylene Chloride U 0.430 5.00 4-Methyl-2-pentanone (MIBK)U 0.478 10.0 Methyl tert-butyl ether U 0.101 1.00 Naphthalene U 1.00 5.00 n-Propylbenzene U 0.0993 1.00 Styrene U 0.118 1.00 1,1,1,2-Tetrachloroethane U 0.147 1.00 1,1,2,2-Tetrachloroethane U 0.133 1.00 1,1,2-Trichlorotrifluoroethane U 0.180 1.00 Tetrachloroethene U 0.300 1.00 Toluene U 0.278 1.00 1,2,3-Trichlorobenzene U 0.230 1.00 1,2,4-Trichlorobenzene U 0.481 1.00 1,1,1-Trichloroethane U 0.149 1.00 1,1,2-Trichloroethane U 0.158 1.00 Trichloroethene U 0.190 1.00 Trichlorofluoromethane U 0.160 5.00 1,2,3-Trichloropropane U 0.237 2.50 1,2,4-Trimethylbenzene U 0.322 1.00 1,2,3-Trimethylbenzene U 0.104 1.00 1,3,5-Trimethylbenzene U 0.104 1.00 Vinyl chloride U 0.234 1.00 Xylenes, Total U 0.174 3.00 (S) Toluene-d8 93.8 80.0-120 (S) 4-Bromofluorobenzene 104 77.0-126 (S) 1,2-Dichloroethane-d4 125 70.0-130 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R4156417-1 12/10/24 09:23 • (LCSD) R4156417-2 12/10/24 09:41 Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits Analyte ug/l ug/l ug/l %%%%% Acetone 25.0 39.3 32.2 157 129 19.0-160 J J 19.9 27 Acrolein 25.0 3.48 0.000 13.9 0.000 10.0-160 J J3 J4 200 26 Acrylonitrile 25.0 37.9 39.5 152 158 55.0-149 J4 J4 4.13 20 Benzene 5.00 4.88 4.58 97.6 91.6 70.0-123 6.34 20 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 34 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 34 of 49 QUALITY CONTROL SUMMARYWG2415667 Volatile Organic Compounds (GC/MS) by Method 8260B L1805310-03,04,05,06,07,08 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R4156417-1 12/10/24 09:23 • (LCSD) R4156417-2 12/10/24 09:41 Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits Analyte ug/l ug/l ug/l %%%%% Bromobenzene 5.00 5.02 4.73 100 94.6 73.0-121 5.95 20 Bromodichloromethane 5.00 5.11 4.90 102 98.0 75.0-120 4.20 20 Bromoform 5.00 4.74 4.69 94.8 93.8 68.0-132 1.06 20 Bromomethane 5.00 3.98 3.84 79.6 76.8 10.0-160 J J 3.58 25 n-Butylbenzene 5.00 4.71 4.49 94.2 89.8 73.0-125 4.78 20 sec-Butylbenzene 5.00 5.00 4.74 100 94.8 75.0-125 5.34 20 tert-Butylbenzene 5.00 4.72 4.64 94.4 92.8 76.0-124 1.71 20 Carbon tetrachloride 5.00 6.23 6.06 125 121 68.0-126 2.77 20 Chlorobenzene 5.00 4.78 4.51 95.6 90.2 80.0-121 5.81 20 Chlorodibromomethane 5.00 4.52 4.17 90.4 83.4 77.0-125 8.06 20 Chloroethane 5.00 5.75 6.70 115 134 47.0-150 15.3 20 Chloroform 5.00 5.17 4.90 103 98.0 73.0-120 J 5.36 20 Chloromethane 5.00 6.56 6.00 131 120 41.0-142 8.92 20 2-Chlorotoluene 5.00 4.51 4.62 90.2 92.4 76.0-123 2.41 20 4-Chlorotoluene 5.00 4.89 4.73 97.8 94.6 75.0-122 3.33 20 1,2-Dibromo-3-Chloropropane 5.00 4.75 4.86 95.0 97.2 58.0-134 J J 2.29 20 1,2-Dibromoethane 5.00 4.69 4.61 93.8 92.2 80.0-122 1.72 20 Dibromomethane 5.00 4.92 4.74 98.4 94.8 80.0-120 3.73 20 1,2-Dichlorobenzene 5.00 4.74 4.76 94.8 95.2 79.0-121 0.421 20 1,3-Dichlorobenzene 5.00 4.95 4.66 99.0 93.2 79.0-120 6.04 20 1,4-Dichlorobenzene 5.00 4.98 4.70 99.6 94.0 79.0-120 5.79 20 Dichlorodifluoromethane 5.00 4.68 4.40 93.6 88.0 51.0-149 J J 6.17 20 1,1-Dichloroethane 5.00 5.18 4.73 104 94.6 70.0-126 9.08 20 1,2-Dichloroethane 5.00 5.79 5.40 116 108 70.0-128 6.97 20 1,1-Dichloroethene 5.00 5.29 4.74 106 94.8 71.0-124 11.0 20 cis-1,2-Dichloroethene 5.00 5.03 4.67 101 93.4 73.0-120 7.42 20 trans-1,2-Dichloroethene 5.00 4.68 4.39 93.6 87.8 73.0-120 6.39 20 1,2-Dichloropropane 5.00 4.88 4.86 97.6 97.2 77.0-125 0.411 20 1,1-Dichloropropene 5.00 5.13 4.59 103 91.8 74.0-126 11.1 20 1,3-Dichloropropane 5.00 5.11 4.85 102 97.0 80.0-120 5.22 20 cis-1,3-Dichloropropene 5.00 4.59 4.44 91.8 88.8 80.0-123 3.32 20 trans-1,3-Dichloropropene 5.00 4.54 4.49 90.8 89.8 78.0-124 1.11 20 2,2-Dichloropropane 5.00 6.39 6.13 128 123 58.0-130 4.15 20 Di-isopropyl ether 5.00 5.15 5.16 103 103 58.0-138 0.194 20 Ethylbenzene 5.00 4.40 4.32 88.0 86.4 79.0-123 1.83 20 Hexachloro-1,3-butadiene 5.00 3.90 3.94 78.0 78.8 54.0-138 1.02 20 Isopropylbenzene 5.00 4.81 4.66 96.2 93.2 76.0-127 3.17 20 p-Isopropyltoluene 5.00 4.79 4.57 95.8 91.4 76.0-125 4.70 20 2-Butanone (MEK)25.0 43.8 40.7 175 163 44.0-160 J4 J4 7.34 20 Methylene Chloride 5.00 3.93 3.91 78.6 78.2 67.0-120 J J 0.510 20 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 35 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 35 of 49 QUALITY CONTROL SUMMARYWG2415667 Volatile Organic Compounds (GC/MS) by Method 8260B L1805310-03,04,05,06,07,08 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R4156417-1 12/10/24 09:23 • (LCSD) R4156417-2 12/10/24 09:41 Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits Analyte ug/l ug/l ug/l %%%%% 4-Methyl-2-pentanone (MIBK)25.0 30.8 30.9 123 124 68.0-142 0.324 20 Methyl tert-butyl ether 5.00 4.59 4.65 91.8 93.0 68.0-125 1.30 20 Naphthalene 5.00 3.46 3.69 69.2 73.8 54.0-135 J J 6.43 20 n-Propylbenzene 5.00 5.02 4.43 100 88.6 77.0-124 12.5 20 Styrene 5.00 4.46 4.21 89.2 84.2 73.0-130 5.77 20 1,1,1,2-Tetrachloroethane 5.00 4.38 4.25 87.6 85.0 75.0-125 3.01 20 1,1,2,2-Tetrachloroethane 5.00 5.24 5.01 105 100 65.0-130 4.49 20 1,1,2-Trichlorotrifluoroethane 5.00 5.42 5.00 108 100 69.0-132 8.06 20 Tetrachloroethene 5.00 4.97 4.53 99.4 90.6 72.0-132 9.26 20 Toluene 5.00 4.65 4.43 93.0 88.6 79.0-120 4.85 20 1,2,3-Trichlorobenzene 5.00 3.62 3.89 72.4 77.8 50.0-138 7.19 20 1,2,4-Trichlorobenzene 5.00 3.83 3.76 76.6 75.2 57.0-137 1.84 20 1,1,1-Trichloroethane 5.00 5.73 5.22 115 104 73.0-124 9.32 20 1,1,2-Trichloroethane 5.00 4.83 4.47 96.6 89.4 80.0-120 7.74 20 Trichloroethene 5.00 4.83 4.44 96.6 88.8 78.0-124 8.41 20 Trichlorofluoromethane 5.00 4.72 4.58 94.4 91.6 59.0-147 J J 3.01 20 1,2,3-Trichloropropane 5.00 5.18 4.92 104 98.4 73.0-130 5.15 20 1,2,4-Trimethylbenzene 5.00 4.66 4.52 93.2 90.4 76.0-121 3.05 20 1,2,3-Trimethylbenzene 5.00 4.46 4.42 89.2 88.4 77.0-120 0.901 20 1,3,5-Trimethylbenzene 5.00 4.90 4.81 98.0 96.2 76.0-122 1.85 20 Vinyl chloride 5.00 4.42 4.31 88.4 86.2 67.0-131 2.52 20 Xylenes, Total 15.0 13.9 13.2 92.7 88.0 79.0-123 5.17 20 (S) Toluene-d8 94.6 94.1 80.0-120 (S) 4-Bromofluorobenzene 99.6 97.4 77.0-126 (S) 1,2-Dichloroethane-d4 125 119 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: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 36 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 36 of 49 QUALITY CONTROL SUMMARYWG2416895 Volatile Organic Compounds (GC/MS) by Method 8260B L1805310-02 Method Blank (MB) (MB) R4157128-4 12/11/24 16:39 MB Result MB Qualifier MB MDL MB RDL Analyte ug/l ug/l ug/l cis-1,2-Dichloroethene U 0.126 1.00 Tetrachloroethene U 0.300 1.00 (S) Toluene-d8 87.4 80.0-120 (S) 4-Bromofluorobenzene 95.6 77.0-126 (S) 1,2-Dichloroethane-d4 141 J1 70.0-130 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R4157128-1 12/11/24 15:12 • (LCSD) R4157128-2 12/11/24 15:32 Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits Analyte ug/l ug/l ug/l %%%%% cis-1,2-Dichloroethene 5.00 5.74 5.13 115 103 73.0-120 11.2 20 Tetrachloroethene 5.00 5.17 4.71 103 94.2 72.0-132 9.31 20 (S) Toluene-d8 84.5 83.1 80.0-120 (S) 4-Bromofluorobenzene 96.6 96.4 77.0-126 (S) 1,2-Dichloroethane-d4 148 142 70.0-130 J1 J1 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 37 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 37 of 49 QUALITY CONTROL SUMMARYWG2412414 Semi Volatile Organic Compounds (GC/MS) by Method 8270C L1805310-02,03,04,05,06 Method Blank (MB) (MB) R4158599-2 12/05/24 01:37 MB Result MB Qualifier MB MDL MB RDL Analyte ug/l ug/l ug/l Acenaphthene U 0.0886 1.00 Acenaphthylene U 0.0921 1.00 Anthracene U 0.0804 1.00 Benzidine U 3.74 10.0 Benzo(a)anthracene U 0.199 1.00 Benzo(b)fluoranthene U 0.130 1.00 Benzo(k)fluoranthene U 0.120 1.00 Benzo(g,h,i)perylene U 0.121 1.00 Benzo(a)pyrene U 0.0381 1.00 Bis(2-chlorethoxy)methane U 0.116 10.0 Bis(2-chloroethyl)ether U 0.137 10.0 2,2-Oxybis(1-Chloropropane)U 0.210 10.0 4-Bromophenyl-phenylether U 0.0877 10.0 2-Chloronaphthalene U 0.0648 1.00 4-Chlorophenyl-phenylether U 0.0926 10.0 Chrysene U 0.130 1.00 Dibenz(a,h)anthracene U 0.0644 1.00 1,2-Dichlorobenzene U 0.0713 10.0 1,3-Dichlorobenzene U 0.132 10.0 1,4-Dichlorobenzene U 0.0942 10.0 3,3-Dichlorobenzidine U 0.212 10.0 2,4-Dinitrotoluene U 0.0983 10.0 2,6-Dinitrotoluene U 0.250 10.0 Fluoranthene U 0.102 1.00 Fluorene U 0.0844 1.00 Hexachlorobenzene U 0.0755 1.00 Hexachloro-1,3-butadiene U 0.0968 10.0 Hexachlorocyclopentadiene U 0.0598 10.0 Hexachloroethane U 0.127 10.0 Indeno(1,2,3-cd)pyrene U 0.279 1.00 Isophorone U 0.143 10.0 Naphthalene U 0.159 1.00 Nitrobenzene U 0.297 10.0 n-Nitrosodimethylamine U 0.998 10.0 n-Nitrosodiphenylamine U 2.37 10.0 n-Nitrosodi-n-propylamine U 0.261 10.0 Phenanthrene U 0.112 1.00 Benzylbutyl phthalate U 0.765 3.00 Bis(2-ethylhexyl)phthalate U 0.895 3.00 Di-n-butyl phthalate U 0.453 3.00 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 38 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 38 of 49 QUALITY CONTROL SUMMARYWG2412414 Semi Volatile Organic Compounds (GC/MS) by Method 8270C L1805310-02,03,04,05,06 Method Blank (MB) (MB) R4158599-2 12/05/24 01:37 MB Result MB Qualifier MB MDL MB RDL Analyte ug/l ug/l ug/l Diethyl phthalate U 0.287 3.00 Dimethyl phthalate U 0.260 3.00 Di-n-octyl phthalate U 0.932 3.00 Pyrene U 0.107 1.00 1,2,4-Trichlorobenzene U 0.0698 10.0 4-Chloro-3-methylphenol U 0.131 10.0 2-Chlorophenol U 0.133 10.0 2,4-Dichlorophenol U 0.102 10.0 2,4-Dimethylphenol U 0.0636 10.0 4,6-Dinitro-2-methylphenol U 1.12 10.0 2,4-Dinitrophenol U 5.93 10.0 2-Nitrophenol U 0.117 10.0 4-Nitrophenol U 0.143 10.0 Pentachlorophenol U 0.313 10.0 Phenol U 4.33 10.0 2,4,6-Trichlorophenol U 0.100 10.0 (S) 2-Fluorophenol 33.4 10.0-120 (S) Phenol-d5 22.1 10.0-120 (S) Nitrobenzene-d5 53.1 10.0-127 (S) 2-Fluorobiphenyl 61.7 10.0-130 (S) 2,4,6-Tribromophenol 44.9 10.0-155 (S) p-Terphenyl-d14 67.4 10.0-128 Laboratory Control Sample (LCS) (LCS) R4158599-1 12/05/24 01:15 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte ug/l ug/l %% Acenaphthene 50.0 35.9 71.8 41.0-120 Acenaphthylene 50.0 34.0 68.0 43.0-120 Anthracene 50.0 35.8 71.6 45.0-120 Benzidine 100 7.64 7.64 10.0-120 J J4 Benzo(a)anthracene 50.0 34.6 69.2 47.0-120 Benzo(b)fluoranthene 50.0 33.7 67.4 46.0-120 Benzo(k)fluoranthene 50.0 34.4 68.8 46.0-120 Benzo(g,h,i)perylene 50.0 32.6 65.2 48.0-121 Benzo(a)pyrene 50.0 33.9 67.8 47.0-120 Bis(2-chlorethoxy)methane 50.0 30.1 60.2 33.0-120 Bis(2-chloroethyl)ether 50.0 32.5 65.0 23.0-120 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 39 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 39 of 49 QUALITY CONTROL SUMMARYWG2412414 Semi Volatile Organic Compounds (GC/MS) by Method 8270C L1805310-02,03,04,05,06 Laboratory Control Sample (LCS) (LCS) R4158599-1 12/05/24 01:15 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte ug/l ug/l %% 2,2-Oxybis(1-Chloropropane)50.0 30.2 60.4 28.0-120 4-Bromophenyl-phenylether 50.0 35.7 71.4 45.0-120 2-Chloronaphthalene 50.0 34.9 69.8 37.0-120 4-Chlorophenyl-phenylether 50.0 35.0 70.0 44.0-120 Chrysene 50.0 34.0 68.0 48.0-120 Dibenz(a,h)anthracene 50.0 34.2 68.4 47.0-120 1,2-Dichlorobenzene 50.0 29.7 59.4 20.0-120 1,3-Dichlorobenzene 50.0 29.4 58.8 17.0-120 1,4-Dichlorobenzene 50.0 29.5 59.0 18.0-120 3,3-Dichlorobenzidine 100 44.4 44.4 44.0-120 2,4-Dinitrotoluene 50.0 37.2 74.4 49.0-124 2,6-Dinitrotoluene 50.0 36.5 73.0 46.0-120 Fluoranthene 50.0 38.2 76.4 51.0-120 Fluorene 50.0 36.4 72.8 47.0-120 Hexachlorobenzene 50.0 32.4 64.8 44.0-120 Hexachloro-1,3-butadiene 50.0 27.8 55.6 19.0-120 Hexachlorocyclopentadiene 50.0 20.2 40.4 15.0-120 Hexachloroethane 50.0 29.1 58.2 15.0-120 Indeno(1,2,3-cd)pyrene 50.0 33.6 67.2 49.0-122 Isophorone 50.0 29.2 58.4 36.0-120 Naphthalene 50.0 29.3 58.6 27.0-120 Nitrobenzene 50.0 28.7 57.4 27.0-120 n-Nitrosodimethylamine 50.0 22.8 45.6 10.0-120 n-Nitrosodiphenylamine 50.0 34.3 68.6 47.0-120 n-Nitrosodi-n-propylamine 50.0 30.1 60.2 31.0-120 Phenanthrene 50.0 34.3 68.6 46.0-120 Benzylbutyl phthalate 50.0 37.6 75.2 43.0-121 Bis(2-ethylhexyl)phthalate 50.0 37.2 74.4 43.0-122 Di-n-butyl phthalate 50.0 39.9 79.8 49.0-121 Diethyl phthalate 50.0 36.4 72.8 48.0-122 Dimethyl phthalate 50.0 35.1 70.2 48.0-120 Di-n-octyl phthalate 50.0 34.2 68.4 42.0-125 Pyrene 50.0 34.0 68.0 47.0-120 1,2,4-Trichlorobenzene 50.0 28.5 57.0 24.0-120 4-Chloro-3-methylphenol 50.0 27.9 55.8 40.0-120 2-Chlorophenol 50.0 28.5 57.0 25.0-120 2,4-Dichlorophenol 50.0 30.3 60.6 36.0-120 2,4-Dimethylphenol 50.0 27.3 54.6 33.0-120 4,6-Dinitro-2-methylphenol 50.0 35.7 71.4 38.0-138 2,4-Dinitrophenol 50.0 31.6 63.2 10.0-120 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 40 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 40 of 49 QUALITY CONTROL SUMMARYWG2412414 Semi Volatile Organic Compounds (GC/MS) by Method 8270C L1805310-02,03,04,05,06 Laboratory Control Sample (LCS) (LCS) R4158599-1 12/05/24 01:15 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte ug/l ug/l %% 2-Nitrophenol 50.0 29.6 59.2 31.0-120 4-Nitrophenol 50.0 15.0 30.0 10.0-120 Pentachlorophenol 50.0 16.1 32.2 23.0-120 Phenol 50.0 13.2 26.4 10.0-120 2,4,6-Trichlorophenol 50.0 35.3 70.6 42.0-120 (S) 2-Fluorophenol 42.2 10.0-120 (S) Phenol-d5 28.4 10.0-120 (S) Nitrobenzene-d5 56.7 10.0-127 (S) 2-Fluorobiphenyl 73.4 10.0-130 (S) 2,4,6-Tribromophenol 63.0 10.0-155 (S) p-Terphenyl-d14 67.5 10.0-128 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 41 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 41 of 49 QUALITY CONTROL SUMMARYWG2413151 Semi Volatile Organic Compounds (GC/MS) by Method 8270C L1805310-07,08 Method Blank (MB) (MB) R4157505-2 12/10/24 15:05 MB Result MB Qualifier MB MDL MB RDL Analyte ug/l ug/l ug/l Acenaphthene U 0.0886 1.00 Acenaphthylene U 0.0921 1.00 Anthracene U 0.0804 1.00 Benzidine U 3.74 10.0 Benzo(a)anthracene U 0.199 1.00 Benzo(b)fluoranthene U 0.130 1.00 Benzo(k)fluoranthene U 0.120 1.00 Benzo(g,h,i)perylene U 0.121 1.00 Benzo(a)pyrene U 0.0381 1.00 Bis(2-chlorethoxy)methane U 0.116 10.0 Bis(2-chloroethyl)ether U 0.137 10.0 2,2-Oxybis(1-Chloropropane)U 0.210 10.0 4-Bromophenyl-phenylether U 0.0877 10.0 2-Chloronaphthalene U 0.0648 1.00 4-Chlorophenyl-phenylether U 0.0926 10.0 Chrysene U 0.130 1.00 Dibenz(a,h)anthracene U 0.0644 1.00 1,2-Dichlorobenzene U 0.0713 10.0 1,3-Dichlorobenzene U 0.132 10.0 1,4-Dichlorobenzene U 0.0942 10.0 3,3-Dichlorobenzidine U 0.212 10.0 2,4-Dinitrotoluene U 0.0983 10.0 2,6-Dinitrotoluene U 0.250 10.0 Fluoranthene U 0.102 1.00 Fluorene U 0.0844 1.00 Hexachlorobenzene U 0.0755 1.00 Hexachloro-1,3-butadiene U 0.0968 10.0 Hexachlorocyclopentadiene U 0.0598 10.0 Hexachloroethane U 0.127 10.0 Indeno(1,2,3-cd)pyrene U 0.279 1.00 Isophorone U 0.143 10.0 Naphthalene U 0.159 1.00 Nitrobenzene U 0.297 10.0 n-Nitrosodimethylamine U 0.998 10.0 n-Nitrosodiphenylamine U 2.37 10.0 n-Nitrosodi-n-propylamine U 0.261 10.0 Phenanthrene U 0.112 1.00 Benzylbutyl phthalate U 0.765 3.00 Bis(2-ethylhexyl)phthalate U 0.895 3.00 Di-n-butyl phthalate U 0.453 3.00 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 42 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 42 of 49 QUALITY CONTROL SUMMARYWG2413151 Semi Volatile Organic Compounds (GC/MS) by Method 8270C L1805310-07,08 Method Blank (MB) (MB) R4157505-2 12/10/24 15:05 MB Result MB Qualifier MB MDL MB RDL Analyte ug/l ug/l ug/l Diethyl phthalate U 0.287 3.00 Dimethyl phthalate U 0.260 3.00 Di-n-octyl phthalate U 0.932 3.00 Pyrene U 0.107 1.00 1,2,4-Trichlorobenzene U 0.0698 10.0 4-Chloro-3-methylphenol U 0.131 10.0 2-Chlorophenol U 0.133 10.0 2,4-Dichlorophenol U 0.102 10.0 2,4-Dimethylphenol U 0.0636 10.0 4,6-Dinitro-2-methylphenol U 1.12 10.0 2,4-Dinitrophenol U 5.93 10.0 2-Nitrophenol U 0.117 10.0 4-Nitrophenol U 0.143 10.0 Pentachlorophenol U 0.313 10.0 Phenol U 4.33 10.0 2,4,6-Trichlorophenol U 0.100 10.0 (S) 2-Fluorophenol 35.3 10.0-120 (S) Phenol-d5 20.7 10.0-120 (S) Nitrobenzene-d5 67.6 10.0-127 (S) 2-Fluorobiphenyl 84.1 10.0-130 (S) 2,4,6-Tribromophenol 81.0 10.0-155 (S) p-Terphenyl-d14 84.1 10.0-128 Laboratory Control Sample (LCS) (LCS) R4157505-1 12/10/24 14:43 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte ug/l ug/l %% Acenaphthene 50.0 52.8 106 41.0-120 Acenaphthylene 50.0 50.4 101 43.0-120 Anthracene 50.0 52.8 106 45.0-120 Benzidine 100 8.15 8.15 10.0-120 J J4 Benzo(a)anthracene 50.0 51.8 104 47.0-120 Benzo(b)fluoranthene 50.0 52.3 105 46.0-120 Benzo(k)fluoranthene 50.0 49.2 98.4 46.0-120 Benzo(g,h,i)perylene 50.0 51.8 104 48.0-121 Benzo(a)pyrene 50.0 51.2 102 47.0-120 Bis(2-chlorethoxy)methane 50.0 37.3 74.6 33.0-120 Bis(2-chloroethyl)ether 50.0 40.9 81.8 23.0-120 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 43 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 43 of 49 QUALITY CONTROL SUMMARYWG2413151 Semi Volatile Organic Compounds (GC/MS) by Method 8270C L1805310-07,08 Laboratory Control Sample (LCS) (LCS) R4157505-1 12/10/24 14:43 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte ug/l ug/l %% 2,2-Oxybis(1-Chloropropane)50.0 38.6 77.2 28.0-120 4-Bromophenyl-phenylether 50.0 60.1 120 45.0-120 2-Chloronaphthalene 50.0 49.9 99.8 37.0-120 4-Chlorophenyl-phenylether 50.0 57.8 116 44.0-120 Chrysene 50.0 51.2 102 48.0-120 Dibenz(a,h)anthracene 50.0 54.8 110 47.0-120 1,2-Dichlorobenzene 50.0 43.6 87.2 20.0-120 1,3-Dichlorobenzene 50.0 42.7 85.4 17.0-120 1,4-Dichlorobenzene 50.0 43.2 86.4 18.0-120 3,3-Dichlorobenzidine 100 82.9 82.9 44.0-120 2,4-Dinitrotoluene 50.0 58.9 118 49.0-124 2,6-Dinitrotoluene 50.0 58.7 117 46.0-120 Fluoranthene 50.0 57.9 116 51.0-120 Fluorene 50.0 54.5 109 47.0-120 Hexachlorobenzene 50.0 55.4 111 44.0-120 Hexachloro-1,3-butadiene 50.0 47.2 94.4 19.0-120 Hexachlorocyclopentadiene 50.0 30.7 61.4 15.0-120 Hexachloroethane 50.0 41.6 83.2 15.0-120 Indeno(1,2,3-cd)pyrene 50.0 54.2 108 49.0-122 Isophorone 50.0 37.5 75.0 36.0-120 Naphthalene 50.0 38.4 76.8 27.0-120 Nitrobenzene 50.0 36.6 73.2 27.0-120 n-Nitrosodimethylamine 50.0 23.3 46.6 10.0-120 n-Nitrosodiphenylamine 50.0 53.2 106 47.0-120 n-Nitrosodi-n-propylamine 50.0 36.3 72.6 31.0-120 Phenanthrene 50.0 52.5 105 46.0-120 Benzylbutyl phthalate 50.0 51.6 103 43.0-121 Bis(2-ethylhexyl)phthalate 50.0 48.9 97.8 43.0-122 Di-n-butyl phthalate 50.0 54.8 110 49.0-121 Diethyl phthalate 50.0 55.6 111 48.0-122 Dimethyl phthalate 50.0 54.7 109 48.0-120 Di-n-octyl phthalate 50.0 45.6 91.2 42.0-125 Pyrene 50.0 50.7 101 47.0-120 1,2,4-Trichlorobenzene 50.0 43.2 86.4 24.0-120 4-Chloro-3-methylphenol 50.0 38.7 77.4 40.0-120 2-Chlorophenol 50.0 34.6 69.2 25.0-120 2,4-Dichlorophenol 50.0 41.2 82.4 36.0-120 2,4-Dimethylphenol 50.0 32.8 65.6 33.0-120 4,6-Dinitro-2-methylphenol 50.0 55.5 111 38.0-138 2,4-Dinitrophenol 50.0 54.4 109 10.0-120 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 44 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 44 of 49 QUALITY CONTROL SUMMARYWG2413151 Semi Volatile Organic Compounds (GC/MS) by Method 8270C L1805310-07,08 Laboratory Control Sample (LCS) (LCS) R4157505-1 12/10/24 14:43 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte ug/l ug/l %% 2-Nitrophenol 50.0 40.5 81.0 31.0-120 4-Nitrophenol 50.0 15.7 31.4 10.0-120 Pentachlorophenol 50.0 44.1 88.2 23.0-120 Phenol 50.0 12.1 24.2 10.0-120 2,4,6-Trichlorophenol 50.0 52.7 105 42.0-120 (S) 2-Fluorophenol 41.8 10.0-120 (S) Phenol-d5 23.3 10.0-120 (S) Nitrobenzene-d5 63.4 10.0-127 (S) 2-Fluorobiphenyl 98.6 10.0-130 (S) 2,4,6-Tribromophenol 105 10.0-155 (S) p-Terphenyl-d14 97.3 10.0-128 L1805513-02 Original Sample (OS) • Matrix Spike (MS) • Matrix Spike Duplicate (MSD) (OS) L1805513-02 12/10/24 16:11 • (MS) R4157505-3 12/10/24 16:32 • (MSD) R4157505-4 12/10/24 16:54 Spike Amount Original Result MS Result MSD Result MS Rec.MSD Rec.Dilution Rec. Limits MS Qualifier MSD Qualifier RPD RPD Limits Analyte ug/l ug/l ug/l ug/l %%%%% Acenaphthene 50.0 U 41.8 38.9 83.6 81.7 1 28.0-120 7.19 25 Acenaphthylene 50.0 U 39.6 37.5 79.2 78.8 1 31.0-121 5.45 25 Anthracene 50.0 U 43.8 40.5 87.6 85.1 1 36.0-120 7.83 23 Benzidine 100 U U 12.7 0.000 13.3 1 10.0-120 J6 J3 200 37 Benzo(a)anthracene 50.0 U 42.3 38.9 84.6 81.7 1 39.0-120 8.37 23 Benzo(b)fluoranthene 50.0 U 42.5 38.3 85.0 80.5 1 37.0-120 10.4 23 Benzo(k)fluoranthene 50.0 U 40.4 36.3 80.8 76.3 1 37.0-120 10.7 26 Benzo(g,h,i)perylene 50.0 U 43.5 38.3 87.0 80.5 1 37.0-123 12.7 25 Benzo(a)pyrene 50.0 U 42.5 38.0 85.0 79.8 1 37.0-120 11.2 24 Bis(2-chlorethoxy)methane 50.0 U 31.0 29.4 62.0 61.8 1 17.0-120 5.30 31 Bis(2-chloroethyl)ether 50.0 U 32.7 30.2 65.4 63.4 1 14.0-120 7.95 33 2,2-Oxybis(1-Chloropropane)50.0 U 31.4 29.0 62.8 60.9 1 18.0-120 7.95 34 4-Bromophenyl-phenylether 50.0 U 48.7 46.6 97.4 97.9 1 37.0-120 4.41 24 2-Chloronaphthalene 50.0 U 38.8 37.8 77.6 79.4 1 29.0-120 2.61 28 4-Chlorophenyl-phenylether 50.0 U 47.6 43.5 95.2 91.4 1 36.0-120 9.00 23 Chrysene 50.0 U 41.2 38.1 82.4 80.0 1 38.0-120 7.82 23 Dibenz(a,h)anthracene 50.0 U 45.1 40.2 90.2 84.5 1 36.0-121 11.5 24 1,2-Dichlorobenzene 50.0 U 32.2 31.0 64.4 65.1 1 18.0-120 3.80 40 1,3-Dichlorobenzene 50.0 U 31.5 30.4 63.0 63.9 1 15.0-120 3.55 40 1,4-Dichlorobenzene 50.0 U 31.8 30.6 63.6 64.3 1 17.0-120 3.85 40 3,3-Dichlorobenzidine 100 U 66.5 72.5 66.5 76.2 1 10.0-134 8.63 30 2,4-Dinitrotoluene 50.0 U 49.3 45.8 98.6 96.2 1 39.0-125 7.36 25 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 45 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 45 of 49 QUALITY CONTROL SUMMARYWG2413151 Semi Volatile Organic Compounds (GC/MS) by Method 8270C L1805310-07,08 L1805513-02 Original Sample (OS) • Matrix Spike (MS) • Matrix Spike Duplicate (MSD) (OS) L1805513-02 12/10/24 16:11 • (MS) R4157505-3 12/10/24 16:32 • (MSD) R4157505-4 12/10/24 16:54 Spike Amount Original Result MS Result MSD Result MS Rec.MSD Rec.Dilution Rec. Limits MS Qualifier MSD Qualifier RPD RPD Limits Analyte ug/l ug/l ug/l ug/l %%%%% 2,6-Dinitrotoluene 50.0 U 47.7 44.8 95.4 94.1 1 36.0-120 6.27 27 Fluoranthene 50.0 U 48.3 45.9 96.6 96.4 1 41.0-121 5.10 22 Fluorene 50.0 U 44.4 41.3 88.8 86.8 1 37.0-120 7.23 24 Hexachlorobenzene 50.0 U 45.6 43.1 91.2 90.5 1 35.0-122 5.64 24 Hexachloro-1,3-butadiene 50.0 U 34.4 34.6 68.8 72.7 1 12.0-120 0.580 34 Hexachlorocyclopentadiene 50.0 U 24.2 24.4 48.4 51.3 1 10.0-120 0.823 33 Hexachloroethane 50.0 U 28.8 28.4 57.6 59.7 1 10.0-120 1.40 40 Indeno(1,2,3-cd)pyrene 50.0 U 45.3 39.3 90.6 82.6 1 38.0-125 14.2 24 Isophorone 50.0 U 31.3 29.3 62.6 61.6 1 21.0-120 6.60 27 Naphthalene 50.0 U 30.9 29.8 61.8 62.6 1 10.0-120 3.62 31 Nitrobenzene 50.0 U 30.1 28.7 60.2 60.3 1 12.0-120 4.76 30 n-Nitrosodimethylamine 50.0 U 18.6 16.6 37.2 34.9 1 10.0-120 11.4 40 n-Nitrosodiphenylamine 50.0 U 42.6 40.1 85.2 84.2 1 37.0-120 6.05 24 n-Nitrosodi-n-propylamine 50.0 U 30.1 27.7 60.2 58.2 1 16.0-120 8.30 30 Phenanthrene 50.0 U 42.0 40.1 84.0 84.2 1 33.0-120 4.63 22 Benzylbutyl phthalate 50.0 U 42.1 38.8 84.2 81.5 1 34.0-126 8.16 24 Bis(2-ethylhexyl)phthalate 50.0 U 39.4 35.8 78.8 75.2 1 33.0-126 9.57 25 Di-n-butyl phthalate 50.0 U 45.0 42.2 90.0 88.7 1 35.0-128 6.42 23 Diethyl phthalate 50.0 U 45.6 41.9 91.2 88.0 1 39.0-125 8.46 24 Dimethyl phthalate 50.0 U 44.7 42.2 89.4 88.7 1 37.0-120 5.75 24 Di-n-octyl phthalate 50.0 U 37.9 34.5 75.8 72.5 1 25.0-135 9.39 26 Pyrene 50.0 U 41.6 37.8 83.2 79.4 1 39.0-120 9.57 22 1,2,4-Trichlorobenzene 50.0 U 32.4 32.8 64.8 68.9 1 15.0-120 1.23 31 4-Chloro-3-methylphenol 50.0 U 35.6 29.6 71.2 62.2 1 26.0-120 18.4 27 2-Chlorophenol 50.0 U 29.3 24.9 58.6 52.3 1 18.0-120 16.2 34 2,4-Dichlorophenol 50.0 U 36.0 32.6 72.0 68.5 1 19.0-120 9.91 27 2,4-Dimethylphenol 50.0 U 28.0 22.5 56.0 47.3 1 15.0-120 21.8 28 4,6-Dinitro-2-methylphenol 50.0 U 45.5 44.3 91.0 93.1 1 10.0-144 2.67 39 2,4-Dinitrophenol 50.0 U 45.5 48.1 91.0 101 1 10.0-120 5.56 40 2-Nitrophenol 50.0 U 33.5 31.9 67.0 67.0 1 20.0-120 4.89 30 4-Nitrophenol 50.0 U 13.7 12.9 27.4 27.1 1 10.0-120 6.02 40 Pentachlorophenol 50.0 U 36.4 40.8 72.8 85.7 1 10.0-128 11.4 37 Phenol 50.0 U 10.7 8.96 21.4 18.8 1 10.0-120 J 17.7 40 2,4,6-Trichlorophenol 50.0 U 42.8 40.6 85.6 85.3 1 26.0-120 5.28 31 (S) 2-Fluorophenol 34.8 30.6 10.0-120 (S) Phenol-d5 20.1 17.9 10.0-120 (S) Nitrobenzene-d5 52.4 54.1 10.0-127 (S) 2-Fluorobiphenyl 77.6 78.9 10.0-130 (S) 2,4,6-Tribromophenol 87.0 88.4 10.0-155 (S) p-Terphenyl-d14 78.8 76.2 10.0-128 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 46 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 46 of 49 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. 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. Original Sample The non-spiked sample in the prep batch used to determine the Relative Percent Difference (RPD) from a quality control sample. The Original Sample may not be included within the reported SDG. 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 E The analyte concentration exceeds the upper limit of the calibration range of the instrument established by the initial calibration (ICAL). J The identification of the analyte is acceptable; the reported value is an estimate. J1 Surrogate recovery limits have been exceeded; values are outside upper control limits. J3 The associated batch QC was outside the established quality control range for precision. J4 The associated batch QC was outside the established quality control range for accuracy. J6 The sample matrix interfered with the ability to make any accurate determination; spike value is low. 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 47 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 47 of 49 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: AECOM - Salt Lake City, Utah L1805310 12/18/24 13:49 48 of 49 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: AECOM - Salt Lake City, Utah L1805310 12/18/24 14:25 48 of 49 Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM 16 Appendix D Boring Logs concrete bentonite granules 10/20 silica sand 12-inch flush mount Steel Blank Screen NANA No well completion or lithology information available for well. Presented completion information inferred based on professional judgement and field measurements. NA concrete bentonite granules 10/20 silica sand 12-inch flush mount Steel Blank Screen NANA No well completion or lithology information available for well. Presented completion information inferred based on professional judgement and field measurements. NA 0 5 10 15 20 25 0 5 10 15 20 25 OTHER TESTS Gr a p h i c Lo g Bl o w Co u n t REMARKS/LITHOLOGIC DESCRIPTION PI D Well Material Pack MaterialDe p t h , F e e t De p t h , F e e t Re c o v e r y in F e e t Diameter of Borehole 4214.75 Drilling Company Drill Rig Type Water levels measured on December 2, 2024. Sheet 1 of 1 NA Approved By Driller's Name Drilling Method NA NA Sampler Type NA Approximate Ground Water Elevation Logged By Comments NA 8 1/4 inch NA SPT Sampler Date(s) Drilled Total Depth in Feet 15 HSA Casing Elevation:4224.23 Project Location: Salt Lake City, Utah Project Number: 60736618 Project: Enbridge SL Operation Center Surf Elev: East:North: 4224.00 Log of: M-10 7447882.4 1523791.23 Re p o r t : A E C O M S L C E N V I R O N M E N T A L ; P r o j e c t F i l e : L : \ D C S \ P R O J E C T S \ _ E N V \ 6 0 7 3 6 6 1 8 _ E N B R I D G E _ S L C _ N O R T H _ O P P \ 4 0 0 _ T E C H N I C A L \ G I N T L O G S \ E N B R I D G E S L N O R T H O P P S C E N T E R . G P J ; D a t a T e m p l a t e : C H E V R O N 2 . G D T P r i n t e d : 2 / 1 2 / 2 5 0 5 10 15 20 25 0 5 10 15 20 25 concrete bentonite granules 10/20 silica sand 12-inch flush mount 2" schedule 40 PVC blank 2" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 171 48 1705 1373 1508 761 80 7.8 4.1 Fill, Asphalt. Fill, imported road base with wood and Asphalt debris. Hydrovacced to 6' bgs. Logged from open boring. Silty Sand (SW), dark brown-gray (10YR 2/2), about 80% fine to coarse sand and 20% fines, loose. Minor odor. No recovery due to flowing sands, assumed to be gravelly sand based on nearby boring logs. No recovery due to flowing sands, assumed to be silty clay based on nearby boring logs and drilling rate. 2.5/4 5/5 1/5 concrete bentonite granules 10/20 silica sand 12-inch flush mount 2" schedule 40 PVC blank 2" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 171 48 1705 1373 1508 761 80 7.8 4.1 Fill, Asphalt. Fill, imported road base with wood and Asphalt debris. Hydrovacced to 6' bgs. Logged from open boring. Silty Sand (SW), dark brown-gray (10YR 2/2), about 80% fine to coarse sand and 20% fines, loose. Minor odor. No recovery due to flowing sands, assumed to be gravelly sand based on nearby boring logs. No recovery due to flowing sands, assumed to be silty clay based on nearby boring logs and drilling rate. 2.5/4 5/5 1/5 0 5 10 15 20 25 0 5 10 15 20 25 OTHER TESTS Gr a p h i c Lo g Bl o w Co u n t REMARKS/LITHOLOGIC DESCRIPTION PI D Well Material Pack MaterialDe p t h , F e e t De p t h , F e e t Re c o v e r y in F e e t Diameter of Borehole 4215.72 Drilling Company Drill Rig Type Water levels measured on December 2, 2024. Sheet 1 of 1 Geoprobe 7822DT Approved By Driller's Name Drilling Method 10/8/24 Lyndsey Anderson Sampler Type Lawrence Cannon Approximate Ground Water Elevation Logged By Comments Justin Heath 4-inch Pacific West Macro-Core MC5 with PVC liner Date(s) Drilled Total Depth in Feet 18 Direct Push Casing Elevation:4226.25 Project Location: Salt Lake City, Utah Project Number: 60736618 Project: Enbridge SL Operation Center Surf Elev: East:North: 4225.52 Log of: MW-101 7448692.51 1523937.66 Re p o r t : A E C O M S L C E N V I R O N M E N T A L ; P r o j e c t F i l e : L : \ D C S \ P R O J E C T S \ _ E N V \ 6 0 7 3 6 6 1 8 _ E N B R I D G E _ S L C _ N O R T H _ O P P \ 4 0 0 _ T E C H N I C A L \ G I N T L O G S \ E N B R I D G E S L N O R T H O P P S C E N T E R . G P J ; D a t a T e m p l a t e : C H E V R O N 2 . G D T P r i n t e d : 2 / 1 2 / 2 5 0 5 10 15 20 25 0 5 10 15 20 25 concrete bentonite granules 10/20 silica sand 12-inch flush mount 2" schedule 40 PVC blank 2" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 3.3 4.0 16.8 4.5 Fill, topsoil and sod. Fill, gravelly sand, silt, material with cobbles and debris. Hydrovacced to 8' bgs. Logged from open boring. Sand (SW), pale brown (10YR 6/3), well-graded sand with no fines, loose, wet. Clay (CL), dark grey (10YR 4/1), low plasticity, stiff, wet. 1/4 5/5 concrete bentonite granules 10/20 silica sand 12-inch flush mount 2" schedule 40 PVC blank 2" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 3.3 4.0 16.8 4.5 Fill, topsoil and sod. Fill, gravelly sand, silt, material with cobbles and debris. Hydrovacced to 8' bgs. Logged from open boring. Sand (SW), pale brown (10YR 6/3), well-graded sand with no fines, loose, wet. Clay (CL), dark grey (10YR 4/1), low plasticity, stiff, wet. 1/4 5/5 0 5 10 15 20 25 0 5 10 15 20 25 OTHER TESTS Gr a p h i c Lo g Bl o w Co u n t REMARKS/LITHOLOGIC DESCRIPTION PI D Well Material Pack MaterialDe p t h , F e e t De p t h , F e e t Re c o v e r y in F e e t Diameter of Borehole 4215.23 Drilling Company Drill Rig Type Water levels measured on December 2, 2024. Sheet 1 of 1 Geoprobe 7822DT Approved By Driller's Name Drilling Method 10/8/24 Lyndsey Anderson Sampler Type Lawrence Cannon Approximate Ground Water Elevation Logged By Comments Justin Heath 4-inch Pacific West Macro-Core MC5 with PVC liner Date(s) Drilled Total Depth in Feet 13 Direct Push 4222.4 Casing Elevation: Project Location: Salt Lake City, Utah Project Number: 60736618 Project: Enbridge SL Operation Center Surf Elev: East:North: 4222.56 Log of: MW-102 7448101.64 1523727.95 Re p o r t : A E C O M S L C E N V I R O N M E N T A L ; P r o j e c t F i l e : L : \ D C S \ P R O J E C T S \ _ E N V \ 6 0 7 3 6 6 1 8 _ E N B R I D G E _ S L C _ N O R T H _ O P P \ 4 0 0 _ T E C H N I C A L \ G I N T L O G S \ E N B R I D G E S L N O R T H O P P S C E N T E R . G P J ; D a t a T e m p l a t e : C H E V R O N 2 . G D T P r i n t e d : 2 / 1 2 / 2 5 0 5 10 15 20 25 0 5 10 15 20 25 concrete bentonite granules 10/20 silica sand 12-inch flush mount 2" schedule 40 PVC blank 2" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 0.6 4.0 16.8 4.5 Fill, topsoil and sod. Fill, gravelly sand, silt, material with cobbles, bricks and other debris. Hydrovacced to 8' bgs. Logged from open boring. Silty Sand (SM), light brown-grey (10YR 6/2), about 90% fine to coarse sand and 10% nonplastic fines, moist, loose, well-graded sand with no fines, loose, wet. Inferred well-graded Sand (SW), wet, flowing, no recovery. 1/2 0/5 0/3 concrete bentonite granules 10/20 silica sand 12-inch flush mount 2" schedule 40 PVC blank 2" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 0.6 4.0 16.8 4.5 Fill, topsoil and sod. Fill, gravelly sand, silt, material with cobbles, bricks and other debris. Hydrovacced to 8' bgs. Logged from open boring. Silty Sand (SM), light brown-grey (10YR 6/2), about 90% fine to coarse sand and 10% nonplastic fines, moist, loose, well-graded sand with no fines, loose, wet. Inferred well-graded Sand (SW), wet, flowing, no recovery. 1/2 0/5 0/3 0 5 10 15 20 25 0 5 10 15 20 25 OTHER TESTS Gr a p h i c Lo g Bl o w Co u n t REMARKS/LITHOLOGIC DESCRIPTION PI D Well Material Pack MaterialDe p t h , F e e t De p t h , F e e t Re c o v e r y in F e e t Diameter of Borehole 4214.13 Drilling Company Drill Rig Type Water levels measured on December 2, 2024. Sheet 1 of 1 Geoprobe 7822DT Approved By Driller's Name Drilling Method 10/9/24 Lyndsey Anderson Sampler Type Lawrence Cannon Approximate Ground Water Elevation Logged By Comments Justin Heath 4-inch Pacific West Macro-Core MC5 with PVC liner Date(s) Drilled Total Depth in Feet 18 Direct Push Casing Elevation:4222.99 Project Location: Salt Lake City, Utah Project Number: 60736618 Project: Enbridge SL Operation Center Surf Elev: East:North: 4222.62 Log of: MW-103 7448138.32 1524198.09 Re p o r t : A E C O M S L C E N V I R O N M E N T A L ; P r o j e c t F i l e : L : \ D C S \ P R O J E C T S \ _ E N V \ 6 0 7 3 6 6 1 8 _ E N B R I D G E _ S L C _ N O R T H _ O P P \ 4 0 0 _ T E C H N I C A L \ G I N T L O G S \ E N B R I D G E S L N O R T H O P P S C E N T E R . G P J ; D a t a T e m p l a t e : C H E V R O N 2 . G D T P r i n t e d : 2 / 1 2 / 2 5 0 5 10 15 20 25 0 5 10 15 20 25 Grout bentonite granules 10/20 silica sand 12-inch flush mount 4" schedule 40 PVC blank 4" schedule 40 PVC 0.010 slot prepack screen PVC screw on bottom cap NANA Railroad ballast. Clayey Silt (ML), topsoil, vegetation present. Sand (SP), brown, medium grained, loose. Gravel and Sand (GP), sandy gravel, loose, wet. Silts and Sands (ML), gray, fine sandy silt. Silty Clay (CL), gray, soft, plastic, slightly moist, clean. NA Grout bentonite granules 10/20 silica sand 12-inch flush mount 4" schedule 40 PVC blank 4" schedule 40 PVC 0.010 slot prepack screen PVC screw on bottom cap NANA Railroad ballast. Clayey Silt (ML), topsoil, vegetation present. Sand (SP), brown, medium grained, loose. Gravel and Sand (GP), sandy gravel, loose, wet. Silts and Sands (ML), gray, fine sandy silt. Silty Clay (CL), gray, soft, plastic, slightly moist, clean. NA 0 5 10 15 20 25 0 5 10 15 20 25 OTHER TESTS Gr a p h i c Lo g Bl o w Co u n t REMARKS/LITHOLOGIC DESCRIPTION PI D Well Material Pack MaterialDe p t h , F e e t De p t h , F e e t Re c o v e r y in F e e t Diameter of Borehole 4215.89 Drilling Company Drill Rig Type Water levels measured on December 2, 2024. Well completion and lithology from Soil-Gas and Groundwater Investigations of the Mountain Fuel Supply Company Operations Center in Salt Lake City, Utah (Dames & Moore, 1986). Sheet 1 of 2 NA Approved By Driller's Name Drilling Method NA NA Sampler Type NA Approximate Ground Water Elevation Logged By Comments NA 8 1/4 inch NA SPT Sampler Date(s) Drilled Total Depth in Feet 28 HSA Casing Elevation:4223.86 Project Location: Salt Lake City, Utah Project Number: 60736618 Project: Enbridge SL Operation Center Surf Elev: East:North: 4223.00 Log of: MW-12 7448899.54 1524113.67 Re p o r t : A E C O M S L C E N V I R O N M E N T A L ; P r o j e c t F i l e : L : \ D C S \ P R O J E C T S \ _ E N V \ 6 0 7 3 6 6 1 8 _ E N B R I D G E _ S L C _ N O R T H _ O P P \ 4 0 0 _ T E C H N I C A L \ G I N T L O G S \ E N B R I D G E S L N O R T H O P P S C E N T E R . G P J ; D a t a T e m p l a t e : C H E V R O N 2 . G D T P r i n t e d : 2 / 1 2 / 2 5 0 5 10 15 20 25 0 5 10 15 20 25 NANA Silty Clay (CL), gray, soft, plastic, slightly moist, clean.NANANA Silty Clay (CL), gray, soft, plastic, slightly moist, clean.NA Well Material Pack Material De p t h , F e e t De p t h , F e e t OTHER TESTS PI D Sheet 2 of 2 LITHOLOGIC DESCRIPTION REMARKS/ Bl o w Co u n t Re c o v e r y in F e e t Gr a p h i c Lo g Casing Elevation:4223.86 Project Location: Salt Lake City, Utah Project Number: 60736618 Project: Enbridge SL Operation Center Surf Elev: East:North: 4223.00 Log of: MW-12 7448899.54 1524113.67 Re p o r t : A E C O M S L C E N V I R O N M E N T A L ; P r o j e c t F i l e : L : \ D C S \ P R O J E C T S \ _ E N V \ 6 0 7 3 6 6 1 8 _ E N B R I D G E _ S L C _ N O R T H _ O P P \ 4 0 0 _ T E C H N I C A L \ G I N T L O G S \ E N B R I D G E S L N O R T H O P P S C E N T E R . G P J ; D a t a T e m p l a t e : C H E V R O N 2 . G D T P r i n t e d : 2 / 1 2 / 2 5 25 30 35 40 45 50 25 30 35 40 45 50 concrete bentonite granules 10/20 silica sand 12-inch flush mount 1" schedule 40 PVC blank 1" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 1.7 2.4 5.8 8.4 440 19.7 Fill, Asphalt. Fill, imported road base with Asphalt debris. Hydrovacced to 5' bgs. Logged from open boring. Sand (SW), greyish-brown (10YR 5/2), well-graded sand with little to no fines, loose, moist Coal gasification residuals (CGR) / sheen at sand / clay contact. Clay (CL), grey (10YR 4/1), low plasticity, dense, wet. NA 2.5/5 4/5 concrete bentonite granules 10/20 silica sand 12-inch flush mount 1" schedule 40 PVC blank 1" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 1.7 2.4 5.8 8.4 440 19.7 Fill, Asphalt. Fill, imported road base with Asphalt debris. Hydrovacced to 5' bgs. Logged from open boring. Sand (SW), greyish-brown (10YR 5/2), well-graded sand with little to no fines, loose, moist Coal gasification residuals (CGR) / sheen at sand / clay contact. Clay (CL), grey (10YR 4/1), low plasticity, dense, wet. NA 2.5/5 4/5 0 5 10 15 20 25 0 5 10 15 20 25 OTHER TESTS Gr a p h i c Lo g Bl o w Co u n t REMARKS/LITHOLOGIC DESCRIPTION PI D Well Material Pack MaterialDe p t h , F e e t De p t h , F e e t Re c o v e r y in F e e t Diameter of Borehole 4215.90 Drilling Company Drill Rig Type Water levels measured on December 2, 2024. Sheet 1 of 1 Geoprobe 7822DT Approved By Driller's Name Drilling Method 10/8/24 Lyndsey Anderson Sampler Type Lawrence Cannon Approximate Ground Water Elevation Logged By Comments Justin Heath 4-inch Pacific West Macro-Core MC5 with PVC liner Date(s) Drilled Total Depth in Feet 12.5 Direct Push Casing Elevation:4222.36 Project Location: Salt Lake City, Utah Project Number: 60736618 Project: Enbridge SL Operation Center Surf Elev: East:North: 4221.81 Log of: PZ-1 7448432.82 1523893.59 Re p o r t : A E C O M S L C E N V I R O N M E N T A L ; P r o j e c t F i l e : L : \ D C S \ P R O J E C T S \ _ E N V \ 6 0 7 3 6 6 1 8 _ E N B R I D G E _ S L C _ N O R T H _ O P P \ 4 0 0 _ T E C H N I C A L \ G I N T L O G S \ E N B R I D G E S L N O R T H O P P S C E N T E R . G P J ; D a t a T e m p l a t e : C H E V R O N 2 . G D T P r i n t e d : 2 / 1 2 / 2 5 0 5 10 15 20 25 0 5 10 15 20 25 concrete bentonite granules 10/20 silica sand 12-inch flush mount 1" schedule 40 PVC blank 1" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 0.5 1.1 0.6 1.1 2.1 2.1 Fill, topsoil and sod. Fill, gravelly sand with cobbles and debris. Hydrovacced to 7' bgs. Logged from open boring. Sand (SW), light brown, well-graded sand with no fines. Silty Sand (SM), dark brown-grey (10YR 2/2), about 70% fine to coarse sand and 30% nonplastic fines, loose, wet, no odor. Inferred Sand (SP), flowing sands with no recovery. NA 3/5 4/5 concrete bentonite granules 10/20 silica sand 12-inch flush mount 1" schedule 40 PVC blank 1" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 0.5 1.1 0.6 1.1 2.1 2.1 Fill, topsoil and sod. Fill, gravelly sand with cobbles and debris. Hydrovacced to 7' bgs. Logged from open boring. Sand (SW), light brown, well-graded sand with no fines. Silty Sand (SM), dark brown-grey (10YR 2/2), about 70% fine to coarse sand and 30% nonplastic fines, loose, wet, no odor. Inferred Sand (SP), flowing sands with no recovery. NA 3/5 4/5 0 5 10 15 20 25 0 5 10 15 20 25 OTHER TESTS Gr a p h i c Lo g Bl o w Co u n t REMARKS/LITHOLOGIC DESCRIPTION PI D Well Material Pack MaterialDe p t h , F e e t De p t h , F e e t Re c o v e r y in F e e t Diameter of Borehole 4216.09 Drilling Company Drill Rig Type Water levels measured on December 2, 2024. Sheet 1 of 1 Geoprobe 7822DT Approved By Driller's Name Drilling Method 10/8/24 Lyndsey Anderson Sampler Type Lawrence Cannon Approximate Ground Water Elevation Logged By Comments Justin Heath 4-inch Pacific West Macro-Core MC5 with PVC liner Date(s) Drilled Total Depth in Feet 18 Direct Push Casing Elevation:4223.58 Project Location: Salt Lake City, Utah Project Number: 60736618 Project: Enbridge SL Operation Center Surf Elev: East:North: 4222.92 Log of: PZ-2 7448444.46 1523489.56 Re p o r t : A E C O M S L C E N V I R O N M E N T A L ; P r o j e c t F i l e : L : \ D C S \ P R O J E C T S \ _ E N V \ 6 0 7 3 6 6 1 8 _ E N B R I D G E _ S L C _ N O R T H _ O P P \ 4 0 0 _ T E C H N I C A L \ G I N T L O G S \ E N B R I D G E S L N O R T H O P P S C E N T E R . G P J ; D a t a T e m p l a t e : C H E V R O N 2 . G D T P r i n t e d : 2 / 1 2 / 2 5 0 5 10 15 20 25 0 5 10 15 20 25 concrete bentonite granules 10/20 silica sand 12-inch flush mount 1" schedule 40 PVC blank 1" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 2.2 2.1 1.8 1.6 4.0 4.2 4.1 4.1 2.2 3.5 1.7 Fill, Asphalt. Fill, imported road base with Asphalt debris. Hydrovacced to 6' bgs. Logged from open boring. Sand (SW), greyish-brown (10YR 5/2), well-graded sand with little to no fines, loose, moist Silty Sand (SM), dark brown-grey (10YR 2/2), about 80% fine to coarse sand and 20% nonplastic fines, dense, wet, no odor. Flowing sands below 18' bgs, no sample collected. NA 3/5 5/5 3/3 concrete bentonite granules 10/20 silica sand 12-inch flush mount 1" schedule 40 PVC blank 1" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 2.2 2.1 1.8 1.6 4.0 4.2 4.1 4.1 2.2 3.5 1.7 Fill, Asphalt. Fill, imported road base with Asphalt debris. Hydrovacced to 6' bgs. Logged from open boring. Sand (SW), greyish-brown (10YR 5/2), well-graded sand with little to no fines, loose, moist Silty Sand (SM), dark brown-grey (10YR 2/2), about 80% fine to coarse sand and 20% nonplastic fines, dense, wet, no odor. Flowing sands below 18' bgs, no sample collected. NA 3/5 5/5 3/3 0 5 10 15 20 25 0 5 10 15 20 25 OTHER TESTS Gr a p h i c Lo g Bl o w Co u n t REMARKS/LITHOLOGIC DESCRIPTION PI D Well Material Pack MaterialDe p t h , F e e t De p t h , F e e t Re c o v e r y in F e e t Diameter of Borehole 4216.12 Drilling Company Drill Rig Type Water levels measured on December 2, 2024. Sheet 1 of 1 Geoprobe 7822DT Approved By Driller's Name Drilling Method 10/8/24 Lyndsey Anderson Sampler Type Lawrence Cannon Approximate Ground Water Elevation Logged By Comments Justin Heath 4-inch Pacific West Macro-Core MC5 with PVC liner Date(s) Drilled Total Depth in Feet 18 Direct Push Casing Elevation:4224.60 Project Location: Salt Lake City, Utah Project Number: 60736618 Project: Enbridge SL Operation Center Surf Elev: East:North: 4224.24 Log of: PZ-3 7448688.76 1523605.87 Re p o r t : A E C O M S L C E N V I R O N M E N T A L ; P r o j e c t F i l e : L : \ D C S \ P R O J E C T S \ _ E N V \ 6 0 7 3 6 6 1 8 _ E N B R I D G E _ S L C _ N O R T H _ O P P \ 4 0 0 _ T E C H N I C A L \ G I N T L O G S \ E N B R I D G E S L N O R T H O P P S C E N T E R . G P J ; D a t a T e m p l a t e : C H E V R O N 2 . G D T P r i n t e d : 2 / 1 2 / 2 5 0 5 10 15 20 25 0 5 10 15 20 25 concrete bentonite granules 10/20 silica sand 8-inch flush mount 2" schedule 40 PVC blank 2" schedule 40 PVC 0.010 slot prepack screen PVC screw on bottom cap NA0.0 0.0 0.0 0.0 0.3 0.6 0.6 0.9 1.0 0.2 Silty Sand (SM), dark brown, soft, moist. Sand with Silt (SM), light brown, moist. Sand (SP), light gray, medium to fine grained, wet below 9 feet. Lean Clay (CL), light gray, low plasticity, soft, moist. 50% 70% 60% 50% concrete bentonite granules 10/20 silica sand 8-inch flush mount 2" schedule 40 PVC blank 2" schedule 40 PVC 0.010 slot prepack screen PVC screw on bottom cap NA0.0 0.0 0.0 0.0 0.3 0.6 0.6 0.9 1.0 0.2 Silty Sand (SM), dark brown, soft, moist. Sand with Silt (SM), light brown, moist. Sand (SP), light gray, medium to fine grained, wet below 9 feet. Lean Clay (CL), light gray, low plasticity, soft, moist. 50% 70% 60% 50% 0 5 10 15 20 25 0 5 10 15 20 25 OTHER TESTS Gr a p h i c Lo g Bl o w Co u n t REMARKS/LITHOLOGIC DESCRIPTION PI D Well Material Pack MaterialDe p t h , F e e t De p t h , F e e t Re c o v e r y in F e e t Diameter of Borehole 4215.17 Drilling Company Drill Rig Type Water levels measured on December 2, 2024. Well completion and lithology from Groundwater Sampling and Slurry Wall Evaluation Report, Dominion Energy Services, Inc. (Kleinfelder, 2020). Sheet 1 of 1 Geoprobe 7822DT Approved By Driller's Name Drilling Method 2/26/20 R. Stella Sampler Type NA Approximate Ground Water Elevation Logged By Comments Pat Casey and Mark Taggart 4-inch Earthprobe Macro-Core MC5 with PVC liner Date(s) Drilled Total Depth in Feet 15 Direct Push Casing Elevation:4222.57 Project Location: Salt Lake City, Utah Project Number: 60736618 Project: Enbridge SL Operation Center Surf Elev: East:North: 4222.15 Log of: SW-1 7448432.59 1523931.89 Re p o r t : A E C O M S L C E N V I R O N M E N T A L ; P r o j e c t F i l e : L : \ D C S \ P R O J E C T S \ _ E N V \ 6 0 7 3 6 6 1 8 _ E N B R I D G E _ S L C _ N O R T H _ O P P \ 4 0 0 _ T E C H N I C A L \ G I N T L O G S \ E N B R I D G E S L N O R T H O P P S C E N T E R . G P J ; D a t a T e m p l a t e : C H E V R O N 2 . G D T P r i n t e d : 2 / 1 2 / 2 5 0 5 10 15 20 25 0 5 10 15 20 25 concrete bentonite granules 10/20 silica sand 4" X 4" stickup 1" schedule 40 PVC blank 1" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 0.3 0.4 0.7 0.3 0.2 0.1 Asphalt. Fill, gravelly sand, silt, material with cobbles and debris. Hydrovacced to 5' bgs. Logged from open boring. Silty Sand (SM), grey to black, about 40% nonplastic fines and 60% fine to medium grained sand, moist. Sand (SW), grey, well-graded fine to coarse sand, loose, wet, flowing. Sandy Clay (CL), grey, about 25% fine sand and 75% low plasticity fines, soft, moist. Peat. Sandy Clay (CL), grey, about 25% fine sand and 75% low plasticity fines, soft, moist. 0/5 3/5 4/5 4/5 concrete bentonite granules 10/20 silica sand 4" X 4" stickup 1" schedule 40 PVC blank 1" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 0.3 0.4 0.7 0.3 0.2 0.1 Asphalt. Fill, gravelly sand, silt, material with cobbles and debris. Hydrovacced to 5' bgs. Logged from open boring. Silty Sand (SM), grey to black, about 40% nonplastic fines and 60% fine to medium grained sand, moist. Sand (SW), grey, well-graded fine to coarse sand, loose, wet, flowing. Sandy Clay (CL), grey, about 25% fine sand and 75% low plasticity fines, soft, moist. Peat. Sandy Clay (CL), grey, about 25% fine sand and 75% low plasticity fines, soft, moist. 0/5 3/5 4/5 4/5 0 5 10 15 20 25 0 5 10 15 20 25 OTHER TESTS Gr a p h i c Lo g Bl o w Co u n t REMARKS/LITHOLOGIC DESCRIPTION PI D Well Material Pack MaterialDe p t h , F e e t De p t h , F e e t Re c o v e r y in F e e t Diameter of Borehole 4216.00 Drilling Company Drill Rig Type Water levels measured on December 2, 2024. Sheet 1 of 1 Geoprobe 7822DT Approved By Driller's Name Drilling Method 11/25/24 Lyndsey Anderson Sampler Type Lawrence Cannon Approximate Ground Water Elevation Logged By Comments Lucas Madson 4-inch ET Technologies Macro-Core MC5 with PVC liner Date(s) Drilled Total Depth in Feet 20 Direct Push Casing Elevation:4224.80 Project Location: Salt Lake City, Utah Project Number: 60736618 Project: Enbridge SL Operation Center Surf Elev: East:North: 4227.37 Log of: SWP-1 7448865.29 1523751.09 Re p o r t : A E C O M S L C E N V I R O N M E N T A L ; P r o j e c t F i l e : L : \ D C S \ P R O J E C T S \ _ E N V \ 6 0 7 3 6 6 1 8 _ E N B R I D G E _ S L C _ N O R T H _ O P P \ 4 0 0 _ T E C H N I C A L \ G I N T L O G S \ E N B R I D G E S L N O R T H O P P S C E N T E R . G P J ; D a t a T e m p l a t e : C H E V R O N 2 . G D T P r i n t e d : 2 / 1 2 / 2 5 0 5 10 15 20 25 0 5 10 15 20 25 concrete bentonite granules 10/20 silica sand 4" X 4" stickup 1" schedule 40 PVC blank 1" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 0.5 0.6 0.4 0.7 0.3 Asphalt. Fill, gravelly sand, silt, material with cobbles and debris. Hydrovacced to 5' bgs. Logged from open boring. Silty Sand (SM), grey to black, about 40% nonplastic fines and 60% fine to medium grained sand, moist. Sand (SW), grey, well-graded fine to coarse sand, loose, wet, flowing. Sandy Clay (CL), grey, about 25% fine sand and 75% low plasticity fines, soft, moist. Peat Sandy Clay (CL), grey, about 25% fine sand and 75% low plasticity fines, soft, moist. NA 3/5 4/5 4/5 concrete bentonite granules 10/20 silica sand 4" X 4" stickup 1" schedule 40 PVC blank 1" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 0.5 0.6 0.4 0.7 0.3 Asphalt. Fill, gravelly sand, silt, material with cobbles and debris. Hydrovacced to 5' bgs. Logged from open boring. Silty Sand (SM), grey to black, about 40% nonplastic fines and 60% fine to medium grained sand, moist. Sand (SW), grey, well-graded fine to coarse sand, loose, wet, flowing. Sandy Clay (CL), grey, about 25% fine sand and 75% low plasticity fines, soft, moist. Peat Sandy Clay (CL), grey, about 25% fine sand and 75% low plasticity fines, soft, moist. NA 3/5 4/5 4/5 0 5 10 15 20 25 0 5 10 15 20 25 OTHER TESTS Gr a p h i c Lo g Bl o w Co u n t REMARKS/LITHOLOGIC DESCRIPTION PI D Well Material Pack MaterialDe p t h , F e e t De p t h , F e e t Re c o v e r y in F e e t Diameter of Borehole 4216.46 Drilling Company Drill Rig Type Water levels measured on December 2, 2024. Sheet 1 of 1 Geoprobe 7822DT Approved By Driller's Name Drilling Method 11/25/24 Lyndsey Anderson Sampler Type Lawrence Cannon Approximate Ground Water Elevation Logged By Comments Lucas Madson 4-inch ET Technologies Macro-Core MC5 with PVC liner Date(s) Drilled Total Depth in Feet 20 Direct Push Casing Elevation:4224.24 Project Location: Salt Lake City, Utah Project Number: 60736618 Project: Enbridge SL Operation Center Surf Elev: East:North: 4226.94 Log of: SWP-2 7448880.39 1523749.81 Re p o r t : A E C O M S L C E N V I R O N M E N T A L ; P r o j e c t F i l e : L : \ D C S \ P R O J E C T S \ _ E N V \ 6 0 7 3 6 6 1 8 _ E N B R I D G E _ S L C _ N O R T H _ O P P \ 4 0 0 _ T E C H N I C A L \ G I N T L O G S \ E N B R I D G E S L N O R T H O P P S C E N T E R . G P J ; D a t a T e m p l a t e : C H E V R O N 2 . G D T P r i n t e d : 2 / 1 2 / 2 5 0 5 10 15 20 25 0 5 10 15 20 25 concrete bentonite granules 10/20 silica sand 12 inch flush mount 1" schedule 40 PVC blank 1" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 0.0 0.0 1.2 116 1580 0.5 Asphalt. No recovery of native material. Pulled existing well material (10' feet of steel blank and screen) and drilled down the existing boring to install new piezometer to 20' bgs. Sand (SW), black (10YR 2/1), fine to coarse well-graded sand with little to no fines, loose, wet, sheen. Coal gasification residuals present at sand / clay interface. Clay (CL), grey (10YR 5/1), stiff, moist. 1/5 1/5 1/5 4/5 concrete bentonite granules 10/20 silica sand 12 inch flush mount 1" schedule 40 PVC blank 1" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA 0.0 0.0 1.2 116 1580 0.5 Asphalt. No recovery of native material. Pulled existing well material (10' feet of steel blank and screen) and drilled down the existing boring to install new piezometer to 20' bgs. Sand (SW), black (10YR 2/1), fine to coarse well-graded sand with little to no fines, loose, wet, sheen. Coal gasification residuals present at sand / clay interface. Clay (CL), grey (10YR 5/1), stiff, moist. 1/5 1/5 1/5 4/5 0 5 10 15 20 25 0 5 10 15 20 25 OTHER TESTS Gr a p h i c Lo g Bl o w Co u n t REMARKS/LITHOLOGIC DESCRIPTION PI D Well Material Pack MaterialDe p t h , F e e t De p t h , F e e t Re c o v e r y in F e e t Diameter of Borehole 4216.23 Drilling Company Drill Rig Type Water levels measured on December 2, 2024. Sheet 1 of 1 Geoprobe 7822DT Approved By Driller's Name Drilling Method 11/24/24 Lyndsey Anderson Sampler Type Lawrence Cannon Approximate Ground Water Elevation Logged By Comments Lucas Madson 4-inch ET Technologies Macro-Core MC5 with PVC liner Date(s) Drilled Total Depth in Feet 20 Direct Push Casing Elevation:4222.07 Project Location: Salt Lake City, Utah Project Number: 60736618 Project: Enbridge SL Operation Center Surf Elev: East:North: 4221.83 Log of: SWP-3 7448573.55 1523411.07 Re p o r t : A E C O M S L C E N V I R O N M E N T A L ; P r o j e c t F i l e : L : \ D C S \ P R O J E C T S \ _ E N V \ 6 0 7 3 6 6 1 8 _ E N B R I D G E _ S L C _ N O R T H _ O P P \ 4 0 0 _ T E C H N I C A L \ G I N T L O G S \ E N B R I D G E S L N O R T H O P P S C E N T E R . G P J ; D a t a T e m p l a t e : C H E V R O N 2 . G D T P r i n t e d : 2 / 1 2 / 2 5 0 5 10 15 20 25 0 5 10 15 20 25 concrete bentonite granules 10/20 silica sand 12 inch flush mount 1" schedule 40 PVC blank 1" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap Asphalt. No recovery of native material. Pulled existing well material (10' feet of steel blank and screen) and drilled down the existing boring to install new piezometer to 20' bgs. Inferred based on SWP-03 lithology. Sand (SW), black (10YR 2/1), fine to coarse well-graded sand with little to no fines, loose, wet, sheen. Clay (CL), grey (10YR 5/1), stiff, moist. 0/5 0/5 0/5 0/5 concrete bentonite granules 10/20 silica sand 12 inch flush mount 1" schedule 40 PVC blank 1" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap Asphalt. No recovery of native material. Pulled existing well material (10' feet of steel blank and screen) and drilled down the existing boring to install new piezometer to 20' bgs. Inferred based on SWP-03 lithology. Sand (SW), black (10YR 2/1), fine to coarse well-graded sand with little to no fines, loose, wet, sheen. Clay (CL), grey (10YR 5/1), stiff, moist. 0/5 0/5 0/5 0/5 0 5 10 15 20 25 0 5 10 15 20 25 OTHER TESTS Gr a p h i c Lo g Bl o w Co u n t REMARKS/LITHOLOGIC DESCRIPTION PI D Well Material Pack MaterialDe p t h , F e e t De p t h , F e e t Re c o v e r y in F e e t Diameter of Borehole 4217.31 Drilling Company Drill Rig Type Water levels measured on December 2, 2024. Sheet 1 of 1 Geoprobe 7822DT Approved By Driller's Name Drilling Method 11/25/24 Lyndsey Anderson Sampler Type Lawrence Cannon Approximate Ground Water Elevation Logged By Comments Lucas Madson 4-inch ET Technologies Macro-Core MC5 with PVC liner Date(s) Drilled Total Depth in Feet 20 Direct Push Casing Elevation:4223.19 Project Location: Salt Lake City, Utah Project Number: 60736618 Project: Enbridge SL Operation Center Surf Elev: East:North: 4222.89 Log of: SWP-4 7448575 1523382.34 Re p o r t : A E C O M S L C E N V I R O N M E N T A L ; P r o j e c t F i l e : L : \ D C S \ P R O J E C T S \ _ E N V \ 6 0 7 3 6 6 1 8 _ E N B R I D G E _ S L C _ N O R T H _ O P P \ 4 0 0 _ T E C H N I C A L \ G I N T L O G S \ E N B R I D G E S L N O R T H O P P S C E N T E R . G P J ; D a t a T e m p l a t e : C H E V R O N 2 . G D T P r i n t e d : 2 / 1 2 / 2 5 0 5 10 15 20 25 0 5 10 15 20 25 concrete bentonite granules 10/20 silica sand 12 inch flush mount 1" schedule 40 PVC blank 1" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA Asphalt. No recovery of native material. Pulled existing well material (10' feet of steel blank and screen) and drilled down the existing boring to install new piezometer to 20' bgs. 0/5 0/5 0/5 0/5 concrete bentonite granules 10/20 silica sand 12 inch flush mount 1" schedule 40 PVC blank 1" schedule 40 PVC 0.020 slot prepack screen PVC screw on bottom cap NA Asphalt. No recovery of native material. Pulled existing well material (10' feet of steel blank and screen) and drilled down the existing boring to install new piezometer to 20' bgs. 0/5 0/5 0/5 0/5 0 5 10 15 20 25 0 5 10 15 20 25 OTHER TESTS Gr a p h i c Lo g Bl o w Co u n t REMARKS/LITHOLOGIC DESCRIPTION PI D Well Material Pack MaterialDe p t h , F e e t De p t h , F e e t Re c o v e r y in F e e t Diameter of Borehole 4216.07 Drilling Company Drill Rig Type Water levels measured on December 2, 2024. Sheet 1 of 1 Geoprobe 7822DT Approved By Driller's Name Drilling Method 11/25/24 Lyndsey Anderson Sampler Type Lawrence Cannon Approximate Ground Water Elevation Logged By Comments Lucas Madson 4-inch ET Technologies Macro-Core MC5 with PVC liner Date(s) Drilled Total Depth in Feet 20 Direct Push Casing Elevation:4223.62 Project Location: Salt Lake City, Utah Project Number: 60736618 Project: Enbridge SL Operation Center Surf Elev: East:North: 4223.29 Log of: SWP-5 7448284 1523697.95 Re p o r t : A E C O M S L C E N V I R O N M E N T A L ; P r o j e c t F i l e : L : \ D C S \ P R O J E C T S \ _ E N V \ 6 0 7 3 6 6 1 8 _ E N B R I D G E _ S L C _ N O R T H _ O P P \ 4 0 0 _ T E C H N I C A L \ G I N T L O G S \ E N B R I D G E S L N O R T H O P P S C E N T E R . G P J ; D a t a T e m p l a t e : C H E V R O N 2 . G D T P r i n t e d : 2 / 1 2 / 2 5 0 5 10 15 20 25 0 5 10 15 20 25 concrete bentonite granules 10/20 silica sand 12-inch flush mount Steel Blank Screen PVC screw on bottom cap NANA No well completion or lithology information available for well. Presented completion information inferred based on professional judgement and field measurements.NA NA NA NA NA concrete bentonite granules 10/20 silica sand 12-inch flush mount Steel Blank Screen PVC screw on bottom cap NANA No well completion or lithology information available for well. Presented completion information inferred based on professional judgement and field measurements.NA NA NA NA NA 0 5 10 15 20 25 0 5 10 15 20 25 OTHER TESTS Gr a p h i c Lo g Bl o w Co u n t REMARKS/LITHOLOGIC DESCRIPTION PI D Well Material Pack MaterialDe p t h , F e e t De p t h , F e e t Re c o v e r y in F e e t Diameter of Borehole 4214.81 Drilling Company Drill Rig Type Water levels measured on December 2, 2024. Sheet 1 of 1 NA Approved By Driller's Name Drilling Method NA NA Sampler Type NA Approximate Ground Water Elevation Logged By Comments Lucas Madson NA NA NA Date(s) Drilled Total Depth in Feet 23 HSA Casing Elevation:4223.75 Project Location: Salt Lake City, Utah Project Number: 60736618 Project: Enbridge SL Operation Center Surf Elev: East:North: 4223.49 Log of: SWP-6 7448271.8 1523697.72 Re p o r t : A E C O M S L C E N V I R O N M E N T A L ; P r o j e c t F i l e : L : \ D C S \ P R O J E C T S \ _ E N V \ 6 0 7 3 6 6 1 8 _ E N B R I D G E _ S L C _ N O R T H _ O P P \ 4 0 0 _ T E C H N I C A L \ G I N T L O G S \ E N B R I D G E S L N O R T H O P P S C E N T E R . G P J ; D a t a T e m p l a t e : C H E V R O N 2 . G D T P r i n t e d : 2 / 1 2 / 2 5 0 5 10 15 20 25 0 5 10 15 20 25 Annual Monitoring Report Enbridge Gas Utah Project number: 60736618 PreparedFor: Enbridge Gas Utah AECOM 17