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HomeMy WebLinkAboutDSHW-2024-005245GROUNDWATER MONITORING REPORT – OCTOBER 2023 Former Hercules Bacchus Plant 3 West Valley City, Utah Prepared for Hercules, LLC 500 Hercules Road Wilmington, Delaware 19808-1599 Prepared by Geosyntec Consultants, Inc. 215 South State Street, Suite 500 Salt Lake City, Utah 84111 Project SLC1070 March 2024 R-Oct 2023 Bacchus GW Monitoring Report.docx i March 2024 TABLE OF CONTENTS ACRONYMS AND ABBREVIATIONS ...................................................................................III 1.INTRODUCTION .................................................................................................................1 1.1 Site Description ............................................................................................................1 1.2 Site Background ...........................................................................................................1 1.3 Report Content .............................................................................................................2 2.GROUNDWATER MONITORING ACTIVITIES ..............................................................4 2.1 Groundwater Level Measurements ..............................................................................4 2.2 Groundwater Sample Collection ..................................................................................4 2.3 Sample Handling and Custody .....................................................................................5 2.4 Laboratory Analytical Testing ......................................................................................5 2.5 Management of Purge Water ........................................................................................5 2.6 Management of PPE and Other Consumable Supplies ................................................5 3. GROUNDWATER LEVEL DATA ......................................................................................6 4. GROUNDWATER ANALYTICAL RESULTS ...................................................................7 4.1 1987 Spill Area .............................................................................................................7 4.2 1988 Spill Area .............................................................................................................7 4.3 Downgradient Well Location .......................................................................................8 4.4 ATK Data .....................................................................................................................8 5.DATA VALIDATION ..........................................................................................................9 5.1 Field Sampling Procedures ...........................................................................................9 5.2 Laboratory Analytical Procedures ................................................................................9 5.3 Quality Assurance/Quality Control Samples ...............................................................9 5.3.1 Field QA/QC Samples ......................................................................................9 5.3.2 Laboratory QA/QC Samples ..........................................................................10 6. STATISTICAL TREND EVALUATION ...........................................................................11 6.1 Groundwater Dataset ..................................................................................................11 6.2 Data Preprocessing .....................................................................................................11 6.3 Mann-Kendal Trend Analysis ....................................................................................12 6.4 Time Series Plots ........................................................................................................13 6.5 Mann-Kendall Results ................................................................................................13 6.6 Confidence Factor ......................................................................................................14 7.CONCLUSIONS .................................................................................................................15 8.REFERENCES ....................................................................................................................16 R-Oct 2023 Bacchus GW Monitoring Report.docx ii March 2024 LIST OF FIGURES Figure 1: Site Location Map Figure 2: Site Topographic Map Figure 3: Site Layout Map Figure 4: Groundwater Elevation Hydrographs Figure 5: Groundwater Contour Map Figure 6: Groundwater Analytical Map LIST OF TABLES Table 1: Groundwater Level Summary Table 2: Groundwater Sample Analytical Summary Table 3: Blind Duplicate Sample Summary Table 4: Summary of Statistical Evaluation Result LIST OF APPENDICES Appendix A: Monitoring Well Purge Logs Appendix B: Laboratory Analytical Report Appendix C: Concentration Trend Graphs R-Oct 2023 Bacchus GW Monitoring Report.docx iii March 2024 ACRONYMS AND ABBREVIATIONS AMSL Above Mean Sea Level ATK ATK Launch Systems bgs Below ground surface CF Confidence Factor 1,1-DCA 1,1-Dichloroethane 1,1-DCE 1,1-Dichloroethene 1,2-DCA 1,2-Dichloroethane DWMRC Division of Waste Management and Radiation Control GMP Groundwater Monitoring Plan GMR Groundwater Monitoring Report LCS Laboratory Control Sample LCSD Laboratory Control Sample Duplicate MS/MSD Matrix Spike/Matrix Spike Duplicate MCL Maximum Contaminant Level RSL Regional Screening Level RPD Relative Percent Difference SMP Site Management Plan 1,1,1-TCA 1,1,1-Trichloroethane 1,1,2-TCA 1,1,2-Trichloroethane TCE Trichloroethene USEPA United States Environmental Protection Agency VOC Volatile Organic Compound QA/QC Quality Assurance/Quality Control COC Constituents of Concern PQL Practical Quantitation Limit R-Oct 2023 Bacchus GW Monitoring Report.docx 1 March 2024 1.INTRODUCTION On behalf of Hercules, LLC (Hercules), a wholly owned subsidiary of Ashland, LLC (Ashland), Geosyntec Consultants (Geosyntec) has prepared this Groundwater Monitoring Report (GMR) for the former Bacchus Plant 3 (Plant 3) site in West Valley, Utah. This GMR summarizes the results of the October 2023 groundwater monitoring event. The monitoring activities were conducted in accordance with the Site Management Plan (SMP) (Geosyntec 2021) for the site that was approved by the Division of Waste Management and Radiation Control (DWMRC) on November 19, 2021. In accordance with the SMP, monitoring is currently being conducted on an annual basis. 1.1 Site Description Plant 3 is located at 5400 South 7000 West in West Valley, Utah, along the foothills of the Oquirrh Mountains in the western portion of the Salt Lake Valley, approximately 11 miles southwest of downtown Salt Lake City. The site elevation ranges between 4,975 feet and 5,025 feet above mean sea level, approximately 800 feet above the surrounding valley floor. A map showing the location of Plant 3 is provided as Figure 1. A detailed topographic map of the area is provided as Figure 2. A site layout map is provided as Figure 3. Plant 3 was historically owned and operated by Hercules to manufacture composite materials used in the aerospace industry and was originally developed as part of the larger Bacchus Works facility, which is located to the north. The Bacchus Works facility is currently owned by Northrop Grumman and operated under the name ATK Launch Systems (ATK). Historical aerial photographs of the site suggest that development of Plant 3 dates back to at least the 1960s. Plant 3 is currently owned and operated by Hexcel Corporation, which purchased the facility from Hercules in 1996. As part of the sales agreement, Hercules retained ownership of the Bacchus Pond property, which is located on the north side of the site (see Figure 3). The pond was historically used to contain non-contact cooling water and storm water discharges from Plant 3. Discharges to Bacchus Pond ceased in 1997, shortly after the sale of the property was finalized, and it is now dry. The ATK facility is located immediately north and downgradient from Plant 3 and the Bacchus Pond area. Perchlorate and volatile organic compound (VOC) groundwater impacts extend from the ATK property to the north. 1.2 Site Background Site investigation activities have identified VOCs in groundwater at the Plant 3 site. These impacts are potentially associated with the release of 1,1,1-Trichloroethane (1,1,1-TCA) at two historical spill locations within Plant 3 (ERM 2009, ERM 2013, ERM 2015, and ERM 2018). The reported spills occurred in 1987 and 1988. Approximately 150 gallons of 1,1,1-TCA was reportedly released during the 1987 spill and 100 to 200 gallons was released during the 1988 spill. Based on site records, cleanup activities for both spills were conducted by Hercules immediately after the releases (ERM 2009), although detailed information about the cleanup actions is limited. Both spills were associated with releases from former aboveground storage tanks that contained 1,1,1- TCA. Both tanks have since been removed. The locations of the spill areas are shown in Figure 3. R-Oct 2023 Bacchus GW Monitoring Report.docx 2 March 2024 Five monitoring wells (wells HIMW-1 through HIMW-5), which range in depth from approximately 230 feet to 350 feet below ground surface (bgs), were previously installed to characterize soil and groundwater conditions associated with the historical 1,1,1-TCA releases. Wells HIMW-1 and HIMW-3 were installed in the 1987 spill area; well HIMW-2 was installed in the 1988 spill area; and wells HIMW-4 and HIMW-5 were installed downgradient from the spill areas along the northern boundary of Plant 3. Well HIMW-4 was abandoned by Hexcel in March 2017 to allow for the construction of a storm water collection pond. Three wells were also installed on the Bacchus Pond property (BP-1, BP-2 and BP-3) in 1996 as part of an initial baseline investigation of the Bacchus Pond. All three of these wells remain at the site but have been dry since at least 2008. In addition to the site monitoring wells, data from monitoring wells on the ATK property have also been utilized to evaluate groundwater conditions downgradient (to the north) of Plant 3. Plant 3 monitoring well locations and downgradient ATK wells are shown in Figure 3. Prior investigation findings (ERM 2009, ERM 2013, and ERM 2015) have shown limited detections of VOCs in soil within the spill areas, but VOC concentrations in groundwater above the site management criteria (i.e., USEPA Maximum Contaminant Levels [MCLs] or USEPA Regional Screening Levels [RSLs]) for select constituents. Groundwater sample data shows that the highest concentrations are generally present in the 1988 spill area, with generally lower concentrations in the 1987 spill area and other downgradient well locations. Historical monitoring in the downgradient ATK wells in the vicinity of the site (wells GW-24, GW-25, GW-47, GW-58, GW-59, GW-60, GW-61, GW-75, and GW-83) have generally shown non-detect or trace levels of VOCs with limited screening level exceedances noted (primarily in wells GW-58, GW-60, and GW-61). 1.3 Report Content This GMR is organized into the following sections: •Section 1 – Introduction, which presents an overview and description of the site, relevant background information and the overall content of the GMR. •Section 2 – Groundwater Monitoring Activities, which presents a description of the sampling procedures and protocols used to conduct the groundwater monitoring activities. •Section 3 – Fluid Level Monitoring Results, which presents a summary of the fluid level data collected from the site. •Section 4 – Groundwater Analytical Results, which presents the results of the groundwater samples collected from the site. •Section 5 – Data Validation, which presents the results of the project-specific and laboratory quality control samples collected in conjunction with the sampling activities. R-Oct 2023 Bacchus GW Monitoring Report.docx 3 March 2024 •Section 6 – Statistical Trend Evaluation, which presents the results of the statistical trend evaluation that was performed on the groundwater sample data. •Section 7 – Conclusions, which presents a summary of the conclusions from the groundwater monitoring activities. •Section 8 – References, which presents the reports and other supporting documentation used to prepare this GMR. R-Oct 2023 Bacchus GW Monitoring Report.docx 4 March 2024 2.GROUNDWATER MONITORING ACTIVITIES The following section presents the activities completed during the October 2023 groundwater monitoring event. In accordance with the SMP, all sampling activities were conducted following the procedures and protocols specified in the Groundwater Monitoring Plan (GMP) (ERM 2016a) and associated GMP Addendum (ERM 2016b) for the site, which were approved by the Utah Division of Waste Management and Radiation Control (DWMRC) on April 26, 2016. 2.1 Groundwater Level Measurements Prior to sampling, the static groundwater levels were measured on October 30, 2023 at site monitoring well locations (i.e., HIMW-1, HIMW-2, HIMW-3 and HIMW-5) using an electronic water level probe. Consistent with the GMP, Geosyntec also attempted to collect groundwater levels from select ATK wells (GW-58, GW-59, GW-60 and GW-61), but was unable to obtain access to the ATK facility during the current monitoring event. Groundwater levels were not collected from wells BP-1, BP-2 and BP-3 located within the Bacchus Pond property, as these wells have been dry since at least 2008. Current groundwater levels at the site are consistent with recent levels and remain below the elevation where groundwater has historically been detected in these wells. 2.2 Groundwater Sample Collection Groundwater samples were collected from the site wells on October 30, 2023. All groundwater samples were collected using the dedicated submersible bladder pumps that were previously installed in the wells (QED Micro Purge® bladder pumps). Prior to sampling, each well was purged using low-flow purging techniques. During purging, relevant water quality parameters were measured using a YSI multi-parameter water quality meter equipped with a flow through cell. The water quality meter was calibrated prior to sampling in accordance with the manufacture’s specifications. Purging continued until groundwater quality parameters stabilized in accordance with the following general criteria: •Temperature: ± 10 percent (Cº); •pH: ± 0.2 units; •Specific conductance: ± 10 percent (µs/ms); •Dissolved oxygen: ± 10 percent (mg/L); and •Oxidation reduction potential: ± 10 percent (millivolts). During purging, the water levels in the wells were monitored to ensure that drawdown was minimized and the water level was stable at the time of sampling. Once the water quality parameters stabilized, groundwater samples were collected directly from the dedicated submersible sampling pump discharge. Monitoring well purge logs completed at the time of sampling are included in Appendix A. R-Oct 2023 Bacchus GW Monitoring Report.docx 5 March 2024 2.3 Sample Handling and Custody Upon collection of the groundwater samples, water-proof labels were completed and immediately affixed to each sample container and each sample was given a unique sample identification. All sample bottles were sealed in an individual plastic bag and placed immediately into an insulated cooler with wet ice for storage and shipment to the laboratory for analysis. All samples were stored and shipped to the laboratory under chain of custody via express courier. 2.4 Laboratory Analytical Testing All groundwater samples were submitted to Eurofins laboratory of Arvada Colorado, a Utah certified environmental laboratory, for VOC analysis by EPA Method 8260D. Analysis for 1,4 Dioxane was also performed using EPA Method 8260D with Selective Ion Monitoring (SIM) to obtain a sufficiently low detection limit for this parameter for comparison to site management criteria. The laboratory analytical report prepared by Eurofins is presented in Appendix B. 2.5 Management of Purge Water All purge water (approximately 11 gallons) was collected for off-site management by Hercules in accordance with applicable state and federal regulations. Purge water generated during the monitoring was containerized in a Department of Transportation approved drum for storage and transportation. Management of the collected purge water was determined based on the analytical results from the groundwater samples collected from the individual monitoring wells. Based on the analytical results presented in Section 4.0, the collected purge water is not characteristically hazardous and was managed as a non-hazardous liquid waste at the Clean Harbors, Grassy Mountain Landfill in Tooele County, Utah. 2.6 Management of PPE and Other Consumable Supplies Disposable personal protective equipment (e.g., nitrile gloves), used paper towels, and other incidental sampling materials were disposed of off-site as municipal waste. R-Oct 2023 Bacchus GW Monitoring Report.docx 6 March 2024 3.GROUNDWATER LEVEL DATA Groundwater level data is summarized on the attached Table 1, which includes both present (October 2023) and historical (2008 to 2022, as available) data. Hydrographs of current and historical groundwater elevation data are provided in Figure 4. The October 2023 groundwater contour map and flow direction, developed from the groundwater level data, are shown in Figure 5. As shown on Table 1, groundwater levels within the Plant 3 wells (HIMW-1 to HIMW-3 and HIMW-5) ranged from approximately 181 feet bgs to 259 feet bgs. As illustrated on the groundwater elevation hydrographs presented in Figure 4, generally similar water levels were observed in all wells in comparison to the prior monitoring event. The overall groundwater flow direction (see Figure 5) is to the northwest in the vicinity of the Plant 3 site. The current groundwater flow direction is consistent with historical monitoring data showing similar groundwater flow direction and conditions. As noted on Figure 5, because Geosyntec was not able to access the ATK wells during the current monitoring event, the most recent ATK monitoring data (ATK 2022) was used to infer groundwater flow further downgradient from the Plant 3 site. R-Oct 2023 Bacchus GW Monitoring Report.docx 7 March 2024 4.GROUNDWATER ANALYTICAL RESULTS The following section presents the laboratory analytical results for the groundwater samples that were collected. The results are summarized on Table 2, which includes historical data for comparison purposes. The current results for each well are also presented in Figure 6, including the most recent available analytical data for the ATK wells in the immediate downgradient vicinity of the Plant 3 site (August 2022 results). Data for the ATK wells includes locations GW-58, GW- 60, GW-61 and GW-83, which are the only wells in the immediate area where VOCs are sampled on a routine basis (annually) by ATK. Groundwater data for the ATK wells was obtained from the DWMRC files. Groundwater sample results were compared to the USEPA MCLs for drinking water. For constituents that do not have established MCLs, the USEPA RSLs for tap water were used for comparison purposes. The USEPA MCLs/RSLs have been established as the long-term site management criteria for the Site in accordance with the SMP approved by the DWMRC (Geosyntec 2021). A discussion of the analytical results is presented below. The results are organized into the following sections for discussion purposes: the 1987 spill area, which includes wells HIMW-1 and HIMW-3 (Section 4.1); the 1988 spill area, which includes well HIMW-2 (Section 4.2); and downgradient well location HIMW-5 (Section 4.3). A discussion of the ATK groundwater data is presented in Section 4.4. Section 4.5 presents a qualitative discussion of observed groundwater concentration trends based on the current and prior monitoring results. 4.1 1987 Spill Area No VOCs were detected in well HIMW-1 during the current monitoring event. This is consistent with prior results from this well, which have previously only shown a limited number of VOC detections at trace levels, significantly below the site management criteria. No VOCs have been detected in this well since 2016. Well HIMW-3 showed detections for three compounds, 1,1-Dichlroethene (1,1-DCE) (140 µg/L), 1,4-Dioxane (4.2 µg/L) and 1,1,1-TCA (18 µg/L). The reported 1,1-DCE and 1,4-Dioxane concentrations exceeds the USEPA MCLs of 7 µg/L and 0.46 µg/L for these compounds, respectively. The reported 1,1,1-TCA concentration is below the USEPA MCL of 200 µg/L. 4.2 1988 Spill Area Well HIMW-2 showed detections for six compounds, including: 1,1,2-Trichloroethane (1,1,2- TCA) (1.5 µg/L), 1,1-DCE (4.0 µg/L), 1,2-Dichloroethane (1,2-DCA) (6.5 µg/L), 1,4-Dioxane (3.7 µg/L), Chloroform (0.69 J µg/L), and Trichloroethene (TCE) (85 µg/L). Of the detected VOCs, 1,2 DCA and TCE exceeded their respective USEPA MCLs of 5 µg/L. Additionally, 1,4 Dioxane was detected above the USEPA RSL for this compound of 0.46 µg/L. R-Oct 2023 Bacchus GW Monitoring Report.docx 8 March 2024 4.3 Downgradient Well Location The groundwater sample collected from HIWM-5 showed detections for 1,1,1-TCA (1.3 µg/L), 1,1-DCE (18 µg/L), 1,4 Dioxane (13 µg/L) and Chloroform (2.2 µg/L). Of the detected VOCs, 1,1-DCE exceeded the USEPA MCL of 7 µg/L. 1,4 Dioxane was also detected above the USEPA RSL of 0.46 µg/L. 4.4 ATK Data The most current analytical data (August 2022) for select ATK wells downgradient of Plant 3 is shown in Figure 6. As previously noted in Section 4.0, this includes wells GW-58, GW-60, GW- 61 and GW-83, which are the only nearby, downgradient wells that are monitored by ATK for VOCs on a routine basis (annually). Although these wells are the only nearby, downgradient wells where monitoring for VOCs is ongoing, it should be noted that sampling for VOCs has historically been conducted at other wells in the area. Data from the wells where monitoring for VOCs has been discontinued have historically shown a general pattern of non-detects for VOCs at most locations. A review of the August 2022 ATK monitoring data shows detections of one or more VOC were observed in wells GW-58, GW-60 and GW-61 at concentrations exceeding the USEPA MCLs or RSLs. Detected parameters exceeding the USEPA MCLs or RSLs included 1,1-Dichloroethane (1,1-DCA) (3.2 J µg/L) and 1,1-DCE (8.5 J µg/L) in the sample from well GW-58; TCE (6.1 J µg/L) and 1,1-DCE (8.9 J µg/L) in the sample from well GW-60; and 1,1-DCE (16.1 µg/L) in well GW-61. No exceedances were reported in well GW-83. The 2022 data from these locations is generally consistent with historical data showing similar results (i.e., generally low part-per-billion range VOC concentrations at most locations with slight exceedances of the USEPA MCLs or RSLs for select parameters). These wells are located northeast of the historical Plant 3 spill areas and are generally cross-gradient based on the observed groundwater flow direction. R-Oct 2023 Bacchus GW Monitoring Report.docx 9 March 2024 5.DATA VALIDATION The following section discusses the sample collection procedures, analytical methods, and quality assurance quality control (QA/QC) samples that were collected to evaluate the quality of the laboratory data. The data collected from the site was reviewed for completeness and accuracy relative to the overall objectives and QA/QC procedures presented in the GMP. Where identified, data issues are discussed. Based on the overall review, the data are considered acceptable for the purpose of routine monitoring with qualification where appropriate. 5.1 Field Sampling Procedures All samples were collected and handled in accordance with the general protocols and standard operating procedures presented in the GMP. All samples were placed into clean, laboratory supplied sample vials, and stored on wet ice during transport to the laboratory. All samples were received by the laboratory properly labeled and in good condition. Temperatures at the time of delivery met the recommend holding temperature of less than 4 ºC. As discussed in the case narrative for the laboratory report, a limited number of sample vials had headspace bubbles; however, with the exception of the sample from well HIMW-5, the laboratory was able to use vials without headspace bubbles. The presence of headspace in the sample vials for well HIMW-5 may bias the results low at this location. However, a review of the data does not show a significant difference in comparison with historical results and this condition does not appear to have affected the overall results. During sampling, chain-of-custody records were maintained as evidence of sample custody and control from the point of collection through laboratory analysis. The completed chain-of-custody form is provided with the laboratory analytical report in Appendix B. 5.2 Laboratory Analytical Procedures All samples were analyzed for VOCs using EPA Method 8260D in accordance the analytical method specified in the GMP. Based on a review of the laboratory reports, all sample holding times were met. 5.3 Quality Assurance/Quality Control Samples Both field and internal laboratory QA/QC samples were reviewed to evaluate the overall precision and accuracy of the laboratory data used throughout the project. The laboratory QA/QC summaries are included with the laboratory analytical report in Appendix B. A discussion of the field and laboratory QA/QC samples is presented below. 5.3.1 Field QA/QC Samples During the project, Geosyntec collected field QA/QC samples in accordance with the frequencies specified in the GMP. Collected samples included blind duplicate, matrix spike/matrix spike duplicated (MS/MSD), and trip blank samples. All groundwater samples were collected using the R-Oct 2023 Bacchus GW Monitoring Report.docx 10 March 2024 dedicated sample pumps and tubing installed in the site wells. Because dedicated sampling equipment was used during all sampling activities, no equipment blank samples were collected. Blind Duplicate Samples One blind duplicate sample was collected during the monitoring event in accordance with the sampling frequency specified in the GMP (one blind duplicate per 20 samples). The sample was collected from well HIMW-1 and was given a fabricated sample identification (HIMW-11-GW- 1023) and time so that the location was not known to the laboratory. Both samples showed no detections above the laboratory method detection limit in either sample, demonstrating good laboratory reproducibility and precision. Matrix Spike/Matrix Spike Duplicate (MS/MSD) Samples One project specific MS/MSD was collected during the monitoring event in accordance with the sampling frequency specified in the GMP (one MS/MSD per 20 samples). The MS/MSD sample was collected from well HIMW-2. Trichloroethene was below the laboratory recovery criteria in the MS and MSD. Chloromethane slightly exceeded the recovery percent difference (RPD) limit for this compound. Sample matrix interference and/or non-homogeneity are suspected for the observed exceedances because the associated laboratory control sample (LCS) and duplicate (LCSD) recoveries were within acceptable limits. The results of the MS/MSD samples indicate a potential low bias for trichloroethene and chloroform in the sample from HIMW-2. Trip Blank A trip blank was submitted with the groundwater samples for analysis. No compounds were detected in the sample. 5.3.2 Laboratory QA/QC Samples Internal laboratory QC sample (method blanks, LCS and surrogates) summaries were reviewed for all samples analyzed during the project. The following presents a discussion of these results and any associated data quality issues that were identified, if any. Method Blanks All laboratory method blank samples results were below the laboratory method detection limit, indicating that there was not potential laboratory cross-contamination for any constituents. Laboratory Control Samples All LCS and laboratory control sample duplicate (LCSD) results were within acceptable limits. Surrogate Samples All surrogates were within acceptance criteria for the laboratory. R-Oct 2023 Bacchus GW Monitoring Report.docx 11 March 2024 6.STATISTICAL TREND EVALUATION In accordance with the SMP and the DWMRCs recommendations provided in their correspondence dated March 20, 2023, a statistical trend analysis was performed on the groundwater concentrations trends for all site monitoring wells in conjunction with the October 2023 monitoring event. The statistical analysis was conservatively performed on all 22 VOCs that have been detected in one or more samples/wells since monitoring began at the site in 2008 (see Table 2). While this was done to be conservative, it should be noted that only a relative few compounds (primarily 1,1-DCE, 1,2-DCA, 1,4-Dioxane and TCE) have been routinely detected and/or are currently detected above the site management criteria. Most of the other compounds have only shown limited detections historically and/or have been detected at concentrations that are significantly below site management criteria. The statistical trend analysis was conducted in general accordance with USEPA guidance provided in the “Data Quality Assessment: Statistical Methods for Practitioners (EPA QA/G-9S)” (USPEA, 2006) and American Society for Testing and Materials guidance provided in the “Standard Guide for Developing Appropriate Statistical Approaches for Ground-Water Detection Monitoring Programs” (ASTM, 1009). Additional definitions for trend results were applied using guidance from the Monitoring and Remediation Optimization System (MAROS) software technical guidance (GSI, 2012). The objective of the trend analysis was to evaluate concentration changes in the detected constituents of concern in monitoring wells through time with a reasonable level of confidence and evaluate whether the concentrations show statistical evidence for a downward trend, upward trend, or appear to be stable. 6.1 Groundwater Dataset The evaluated dataset includes historical and current groundwater data, which were collected between March 2008 and October 2023. Basic summary statistics such as mean, median, maximum, and coefficient of variation for each combination of wells and detected constituents are presented in Table 4. In addition, the first and last sampling dates of each well, the number of samples, and number of detections are also included in the Table 4. 6.2 Data Preprocessing The following data preprocessing was performed on the dataset that was used in order to obtain less biased summary statistics: •Non-detect values were evaluated using the median of the detection limit for each constituent; and •Detected concentrations lower than the median detection limit were replaced with the median detection limit. R-Oct 2023 Bacchus GW Monitoring Report.docx 12 March 2024 6.3 Mann-Kendal Trend Analysis The Mann-Kendall test involves computing a statistic, S, which is the difference between the number of pairwise differences that are positive minus the number that are negative. The pairwise differences are the differences between a measured concentration versus another measured concentration prior to it. For example, if there are four measured concentrations, in chronological order: x1, x2, x3, and x4, the pairwise differences are (x2- x1), (x3- x2), (x3- x1), (x4- x3), (x4- x2), and (x4- x1) – that is, a total of six pairwise differences. The statistic S depends on how many positive differences and how many negative differences there are (i.e., S is computed from the differences of these two “counts.”) If S is a large positive value, there is evidence of an increasing trend in the data. If S is a large negative value, there is evidence of a decreasing trend in the data. Because the Mann-Kendall test depends only on the rank order of concentrations through time, it is considered to be a non-parametric statistical test and is robust to distributional assumption and outliers. The null hypothesis (H0) or baseline condition for this test is that there is no temporal trend in the data values. The alternative hypothesis (HA) is that either an upward trend or a downward trend exists. The absolute value of S is then compared with the critical value for the Mann- Kendall test at a 5 percent significance level (i.e., 95 percent confidence level). The critical values for the Mann- Kendall test can be found in Table A-12a of Appendix A of EPA QA/G-9S (USEPA, 2006). An additional classification to the S statistic was applied using the definitions included in the MAROS software technical guide developed for the Air Force Center for Environmental Excellence (AFCEE) (GSI, 2012) as outlined below: S Statistic Confidence In Trend Trend S > 0 CF > 95% Increasing S > 0 95% ≥ CF ≥ 90% Probably Increasing S > 0 CF < 90% No Trend S ≤ 0 CF < 90% and COV ≥ 1 No Trend S ≤ 0 CF < 90% and COV < 1 Stable S < 0 95% ≥ CF ≥ 90% Probably Decreasing S < 0 CF > 95% Decreasing Notes: S = Mann-Kendall Statistic CF = Confidence Factor COV = Coefficient of Variation The Mann-Kendal trend analysis was performed on all 22 constituents that have been detected at the site. However, the trend test was not applied if the number of data points was less than four. As shown on Table 4, the number of data points for each constituent generally ranged between 12 and 14, except for 1,4-Dioxane. Analysis for 1,4-Dioxane was added to the monitoring program in 2020 at the request of the DWMRC and currently only three years of data have been collected R-Oct 2023 Bacchus GW Monitoring Report.docx 13 March 2024 to date. For this reason, 1,4-Dioxane could not be statistically evaluated, but was evaluated qualitatively as discussed in Section 6.5. 6.4 Time Series Plots Time series plots (Appendix C) were prepared for the evaluated wells to show historical concentrations of detected constituents. Under each time series plot, the key information including the first and last sampling date, the Mann-Kendall S statistics, p-value, and trend result of each analyte is shown to better understand the plot. 6.5 Mann-Kendall Results The following section provides a general discussion of the results of the Mann-Kendall trend analysis. As noted previously, 1,4-Dioxane which was qualitatively evaluated due to the limited number of samples, is discussed separately below. As shown on Table 4, the results of the Mann-Kendall trend analysis predominately show stable or decreasing concentrations for almost all compounds, strongly indicating that the groundwater plume is not expanding and will continue to naturally attenuate over time. The only exceptions to this were a limited number of locations/compounds where no statistical trend was identified based on the data. This includes Acetone in wells HIMW-2, HIMW-3 and HIMW-5; 2-Butanone (MEK) in well HIMW-2; Chloroform in well HIMW-5; and 1,2 DCE in well HIMW-2. For the locations where no trend was identified, only 1,2-DCA in well HIMW-2 has been detected above the site management criteria (maximum 1,2-DCA detected concentration in HIMW-2 of 7.8 μg/L in comparison to the site management criteria of 5 μg/L). None of the other compounds where no statistical trend was identified have ever been detected in any samples above the site management criteria and have generally only shown periodic trace detections. It is additionally noted that a lack of an identified trend at these locations is generally due to the limited number of detections and/or limited variation in the analytical results. Therefore, the lack of a statistically identified trend does not indicate that concentrations are likely to increase for these parameters overtime. This is supported by a review of the time series plots for these compounds (see Appendix C), which show very little variation for these compounds over time and generally have flat trend lines. As mentioned previously, statistical evaluation of 1,4-Dioxane was not possible due to the limited number of samples for this compound. 1,4-Dioxane has been detected in wells HIMW-2, HIMW- 3 and HIMW-5, but has not been detected in well HIMW-1. Detected concentrations to date range from non-detect to 16 μg/L. While statistical evaluation of 1,4-Dioxane is not possible, a review of the samples collected to date (see Table 2 and Appendix C) generally shows stable results at most well locations, similar to the other compounds that were evaluated; however, some moderate variation in the data from HIMW-3 is noted (concentrations ranging from non-detect to 4.2 μg/L). Given the current data and the fact the other detected constituents overwhelmingly show stable and or decreasing concentration trends, it is strongly expected that 1,4-Dioxane will also show a similar concentration trend in the future. R-Oct 2023 Bacchus GW Monitoring Report.docx 14 March 2024 6.6 Confidence Factor A Confidence Factor (CF) of 95 percent was recommended in the SMP to demonstrate stability or decreasing trends. As shown on Table 4, the calculated CF does not exceed 95 percent for all compounds. However, it is noted that the CF can be affected due to either considerable variability or little change in the concentrations verses time. A review of the overall results shows that the latter is predominately associated with the lower CF factors at most locations. For example, cis- 1,2-Dichloroethene (cis-1,2-DCE) has only been detected during one of the 14 sampling events at well HIMW-2, but the resulting CF factor is 50 percent. Similar results are found for many other compounds where there is little change in the concentration or limited detections over time. A review of the CFs for the compounds that currently exceed the site management criteria (i.e., 1,1-DCE, 1,2-DCA and TCE; excluding 1,4-Dioxane which was not evaluated) shows that the CFs range from 83 percent to 100 percent, except for TCE at HIMW-1, which has a CF of 50 percent. The CF for TCE at HIMW-1 is lower due to the limited variability of the data at this location. Similar to the example above, TCE has only been detected in HIMW-1 during one of the 14 sampling events and at a concentration significantly below the site management criteria, resulting in a low CF due to the limited variability in the data over time. While the CF does not exceed 95 percent at all locations, the overall evaluation shows that the concentrations at the site are overwhelmingly stable or decreasing in accordance with generally accepted guidance. Based on this, a reduction in the sampling frequency is considered appropriate and is recommended for consideration. R-Oct 2023 Bacchus GW Monitoring Report.docx 15 March 2024 7.CONCLUSIONS On behalf of Hercules, Geosyntec has completed the October 2023 groundwater monitoring event for the former Plant 3 site in West Valley, Utah. The monitoring activities were conducted in accordance with the SMP for the site that was approved by the DWMRC on November 19, 2021. In accordance with the SMP, monitoring is currently being conducted on an annual basis. The monitoring results are consistent with prior site data showing select exceedances of site management criteria in the former spill areas and the downgradient well location. Current exceedances of the site management criteria include: 1,1-DCE and 1,4-Dioxane in the 1987 Spill Area and 1,2-DCA, 1,4-Dioxane and TCE in the 1988 Spill Area. Groundwater results from the downgradient well HIMW-5, also showed site management criteria exceedances for 1,1-DCE and 1,4-Dioxane. In addition to the groundwater monitoring activities, a statistical evaluation of groundwater concentration trends was completed for all compounds that have been detected at the site. The results of the trend analysis support the conclusion that stable or decreasing conditions are present and that the groundwater plume should continue to decrease due to monitored natural attenuation with time. Additionally, 1,4-Dioxane which was qualitatively evaluated, due to limited sample data for this compound, is also expected to follow similar concentration trends. Based on the results of the completed trend analysis, Hercules requests that the monitoring frequency be reduced to bi- annual (every other year) and proposes to conduct the next sampling event in October 2025. R-Oct 2023 Bacchus GW Monitoring Report.docx 16 March 2024 8.REFERENCES ERM. 2009. Environmental Site Characterization Report, Former Hercules Bacchus Plant 3, TCA Spill Areas, West Valley, Utah. Prepared for Hercules Incorporated. ERM. 2013. Preliminary Groundwater Investigation Report, Former Bacchus Plant 3, West Valley Utah. Prepared for Hercules Incorporated. ERM. 2015. Groundwater Investigation Report, Former Bacchus Plant 3, West Valley, Utah. Prepared for Hercules Incorporated. ERM. 2016a. Groundwater Monitoring Plan, Former Bacchus Plant 3, West Valley, Utah. Prepared for Hercules Incorporated. ERM. 2016b. Addendum to Groundwater Monitoring Plan, Former Bacchus Plant 3, West Valley, Utah. Prepared for Hercules Incorporated. ERM. 2018. Groundwater Human Health Risk Assessment. Former Bacchus Plant 3, West Valley, Utah. Prepared for Hercules Incorporated. Geosyntec. 2021. Site Management Plan, Former Hercules Bacchus Plant 3, West Valley, Utah. Prepared for Hercules, LLC. ASTM. 1998. “Standard Guide for Developing Appropriate Statistical Approaches for Ground- Water Detection Monitoring Programs.” ASTM Guide D6312-98. GSI Environmental, 2012. AFCEE Monitoring and Remediation Optimization System (MAROS) Software Technical Manual. USEPA. 2006. Data Quality Assessment: Statistical Methods for Practitioners (EPA QA/G- 9S). USEPA. 2009. Statistical Analysis of Groundwater Monitoring Data at RCRA Facilities. (EPA 530/R-09-007). FIGURES SITE PROJECT NO: FIGURE C: \ U S E R S \ B S M I T H \ D E S K T O P \ A S H L A N D 2 0 2 2 F I G U R E S \ F I G 1 S I T E L O C A T I O N M A P - L a s t S a v e d b y : BS m i t h o n 1/ 4 / 2 2 SITE LOCATION MAP FORMER BACCHUS PLANT 3 WEST VALLEY, UTAH 1 SLC1032 N 20 SCALE IN MILES PROJECT NO: FIGURE C: \ U S E R S \ B S M I T H \ D E S K T O P \ A S H L A N D 2 0 2 2 F I G U R E S \ F I G 2 S I T E T O P O G R A P H I C M A P 2 0 2 0 - L a s t S a v e d b y : B S m i t h o n 1 / 4 / 2 2 SITE TOPOGRAPHIC MAP FORMER BACCHUS PLANT 3 WEST VALLEY, UTAH 2 SLC1070 N 4,0000 SCALE IN FEET LEGEND HERCULES WELL ATK LAUNCH SYSTEMS WELL NOTES: ALL WELL LOCATIONS APPROXIMATE PROJECT NO: FIGURE C: \ U S E R S \ B S M I T H \ D E S K T O P \ A S H L A N D 2 0 2 2 F I G U R E S \ F I G 3 S I T E L A Y O U T M A P - L a s t S a v e d b y : B S m i t h o n 1 / 4 / 2 2 SITE LAYOUT MAP FORMER BACCHUS PLANT 3 WEST VALLEY, UTAH 3 SLC1070 N 6000 SCALE IN FEET TABLES Table 1 Hercules LLC Former Bacchus Plant 3 Groundwater Level Summary Well Date Depth-to-Water Total Depth of Well Ground Surface Elev Top-of-Casing Elev Ground Water Elev HIMW-1 3/19/2008 257.53 350 5019.80 5019.26 4761.73 1/24/2013 255.55 350 5019.80 5019.26 4763.71 3/27/2013 255.54 350 5019.80 5019.26 4763.72 5/28/2013 255.44 350 5019.80 5019.26 4763.82 7/23/2013 255.63 350 5019.80 5019.26 4763.63 5/26/2015 256.2 350 5019.80 5019.26 4763.06 6/8/2015 256.12 350 5019.80 5019.26 4763.14 4/28/2016 255.36 350 5019.80 5019.26 4763.90 7/14/2016 255.45 350 5019.80 5019.26 4763.81 10/19/2016 255.31 350 5019.80 5019.26 4763.95 1/24/2017 255.19 350 5019.80 5019.26 4764.07 10/24/2017 254.55 350 5019.80 5019.26 4764.71 11/10/2017 254.00 350 5019.80 5019.26 4765.26 10/1/2018 253.63 350 5019.80 5019.26 4765.63 11/1/2018 253.75 350 5019.80 5019.26 4765.51 10/3/2019 253.50 350 5019.80 5019.26 4765.76 10/21/2020 255.32 350 5019.80 5019.26 4763.94 10/13/2021 256.43 350 5019.80 5019.26 4762.83 10/20/2021 256.54 350 5019.80 5019.26 4762.72 10/12/2022 256.75 350 5019.80 5019.26 4762.51 10/30/2023 256.83 350 5019.80 5019.26 4762.43 HIMW-2 3/19/2008 188.93 229 5005.74 5005.63 4816.70 1/24/2013 183.71 229 5005.74 5005.63 4821.92 3/27/2013 183.65 229 5005.74 5005.63 4821.98 5/28/2013 183.46 229 5005.74 5005.63 4822.17 7/23/2013 183.69 229 5005.74 5005.63 4821.94 5/26/2015 184.25 229 5005.74 5005.63 4821.38 6/8/2015 184.35 229 5005.74 5005.63 4821.28 4/28/2016 183.48 229 5005.74 5005.63 4822.15 7/14/2016 183.72 229 5005.74 5005.63 4821.91 10/19/2016 183.60 229 5005.74 5005.63 4822.03 1/24/2017 183.37 229 5005.74 5005.63 4822.26 10/24/2017 182.40 229 5005.74 5005.63 4823.23 11/10/2017 181.80 229 5005.74 5005.63 4823.83 10/1/2018 181.53 229 5005.74 5005.63 4824.10 11/1/2018 181.65 229 5005.74 5005.63 4823.98 10/3/2019 179.92 229 5005.74 5005.63 4825.71 10/21/2020 178.92 229 5005.74 5005.63 4826.71 10/13/2021 180.83 229 5005.74 5005.63 4824.80 10/20/2021 181.05 229 5005.74 5005.63 4824.58 10/12/2022 182.61 229 5005.74 5005.63 4823.02 10/30/2023 181.81 229 5005.74 5005.63 4823.82 HIMW-3 5/26/2015 258.08 278 5020.09 5019.74 4761.66 6/8/2015 258.12 278 5020.09 5019.74 4761.62 4/28/2016 257.11 278 5020.09 5019.74 4762.63 7/14/2016 257.00 278 5020.09 5019.74 4762.74 10/19/2016 256.95 278 5020.09 5019.74 4762.79 1/24/2017 256.79 278 5020.09 5019.74 4762.95 10/24/2017 254.89 278 5020.09 5019.74 4764.85 11/10/2017 254.52 278 5020.09 5019.74 4765.22 10/1/2018 254.75 278 5020.09 5019.74 4764.99 11/1/2018 254.92 278 5020.09 5019.74 4764.82 10/3/2019 254.04 278 5020.09 5019.74 4765.70 10/21/2020 257.41 278 5020.09 5019.74 4762.33 10/13/2021 259.57 278 5020.09 5019.74 4760.17 10/20/2021 259.57 278 5020.09 5019.74 4760.17 10/12/2022 260.05 278 5020.09 5019.74 4759.69 10/30/2023 259.82 278 5020.09 5019.74 4759.92 HIMW-4 (Abandoned) 5/26/2015 248.00 292 5004.86 5006.92 4758.92 6/8/2015 248.00 292 5004.86 5006.92 4758.92 4/28/2016 246.68 292 5004.86 5006.92 4760.24 7/14/2016 246.53 292 5004.86 5006.92 4760.39 10/19/2016 246.70 292 5004.86 5006.92 4760.22 1/24/2017 246.59 292 5004.86 5006.92 4760.33 HIMW-5 5/26/2015 242.92 265 5004.48 5004.03 4761.11 6/8/2015 242.87 265 5004.48 5004.03 4761.16 4/28/2016 241.86 265 5004.48 5004.03 4762.17 Page 1 of 3 Table 1 Hercules LLC Former Bacchus Plant 3 Groundwater Level Summary Well Date Depth-to-Water Total Depth of Well Ground Surface Elev Top-of-Casing Elev Ground Water Elev HIMW-5 (cont) 7/14/2016 241.70 265 5004.48 5004.03 4762.33 10/19/2016 241.86 265 5004.48 5004.03 4762.17 1/24/2017 241.75 265 5004.48 5004.03 4762.28 10/24/2017 239.63 265 5004.48 5004.03 4764.40 11/10/2017 239.30 265 5004.48 5004.03 4764.73 10/1/2018 239.55 265 5004.48 5004.03 4764.48 11/1/2018 239.71 265 5004.48 5004.03 4764.32 10/3/2019 238.73 265 5004.48 5004.03 4765.30 10/21/2020 242.01 265 5004.48 5004.03 4762.02 10/13/2021 244.06 265 5004.48 5004.03 4759.97 10/20/2021 244.13 265 5004.48 5004.03 4759.90 10/12/2022 244.63 265 5004.48 5004.03 4759.40 10/30/2023 244.35 265 5004.48 5004.03 4759.68 BP-1 3/19/2008 Dry 121 4971.10 4973.42 - 1/24/2013 Dry 121 4971.10 4973.42 - 3/27/2013 Dry 121 4971.10 4973.42 - 5/28/2013 Dry 121 4971.10 4973.42 - 7/23/2013 Dry 121 4971.10 4973.42 - 6/8/2015 Dry 121 4971.10 4973.42 - 4/28/2016 Dry 121 4971.10 4973.42 - 7/14/2016 Dry 121 4971.10 4973.42 - 10/19/2016 Dry 121 4971.10 4973.42 - 1/24/2017 Dry 121 4971.10 4973.42 - 11/10/2017 Dry 121 4971.10 4973.42 - 10/1/2018 Dry 121 4971.10 4973.42 - 11/1/2018 Dry 121 4971.10 4973.42 - 10/3/2019 Dry 121 4971.10 4973.42 - 10/21/2020 Dry 121 4971.10 4973.42 - BP-2 3/19/2008 Dry 234 4993.73 4995.96 - 1/24/2013 Dry 234 4993.73 4995.96 - 3/27/2013 Dry 234 4993.73 4995.96 - 5/28/2013 Dry 234 4993.73 4995.96 - 7/23/2013 Dry 234 4993.73 4995.96 - 6/8/2015 Dry 234 4993.73 4995.96 - 4/28/2016 Dry 234 4993.73 4995.96 - 7/14/2016 Dry 234 4993.73 4995.96 - 10/19/2016 Dry 234 4993.73 4995.96 - 1/24/2017 Dry 234 4993.73 4995.96 - 11/10/2017 Dry 234 4993.73 4995.96 - 10/1/2018 Dry 234 4993.73 4995.96 - 11/1/2018 Dry 234 4993.73 4995.96 - 10/3/2019 Dry 234 4993.73 4995.96 - 10/21/2020 Dry 234 4993.73 4995.96 - BP-3 3/19/2008 Dry 205 4971.22 4973.17 - 1/24/2013 Dry 205 4971.22 4973.17 - 3/27/2013 Dry 205 4971.22 4973.17 - 5/28/2013 Dry 205 4971.22 4973.17 - 7/23/2013 Dry 205 4971.22 4973.17 - 6/8/2015 Dry 205 4971.22 4973.17 - 4/28/2016 Dry 205 4971.22 4973.17 - 7/14/2016 Dry 205 4971.22 4973.17 - 10/19/2016 Dry 205 4971.22 4973.17 - 1/24/2017 Dry 205 4971.22 4973.17 - 11/10/2017 Dry 205 4971.22 4973.17 - 10/1/2018 Dry 205 4971.22 4973.17 - 11/1/2018 Dry 205 4971.22 4973.17 - 10/3/2019 Dry 205 4971.22 4973.17 - 10/21/2020 Dry 205 4971.22 4973.17 - GW-58 1/24/2013 208.44 360 4967.79 4969.64 4761.20 3/27/2013 208.71 360 4967.79 4969.64 4760.93 5/28/2013 208.78 360 4967.79 4969.64 4760.86 7/23/2013 209.07 360 4967.79 4969.64 4760.57 6/8/2015 210.95 360 4967.79 4969.64 4758.69 4/28/2016 209.85 360 4967.79 4969.64 4759.79 7/14/2016 209.70 360 4967.79 4969.64 4759.94 10/19/2016 209.84 360 4967.79 4969.64 4759.80 1/24/2017 209.57 360 4967.79 4969.64 4760.07 Page 2 of 3 Table 1 Hercules LLC Former Bacchus Plant 3 Groundwater Level Summary Well Date Depth-to-Water Total Depth of Well Ground Surface Elev Top-of-Casing Elev Ground Water Elev GW-58 (cont) 11/10/2017 207.23 360 4967.79 4969.64 4762.41 11/1/2018 207.86 360 4967.79 4969.64 4761.78 10/3/2019 207.49 360 4967.79 4969.64 4762.15 10/21/2020 209.48 360 4967.79 4969.64 4760.16 10/20/2021 211.94 360 4967.79 4969.64 4757.70 8/15/2022 212.68 360 4967.79 4969.64 4756.96 GW-59 1/24/2013 208.73 245 4905.07 4907.08 4698.35 3/27/2013 208.34 245 4905.07 4907.08 4698.74 5/28/2013 208.03 245 4905.07 4907.08 4699.05 7/23/2013 207.90 245 4905.07 4907.08 4699.18 6/8/2015 206.95 245 4905.07 4907.08 4700.13 4/28/2016 205.23 245 4905.07 4907.08 4701.85 7/14/2016 204.86 245 4905.07 4907.08 4702.22 10/19/2016 204.74 245 4905.07 4907.08 4702.34 1/24/2017 204.70 245 4905.07 4907.08 4702.38 11/10/2017 203.99 245 4905.07 4907.08 4703.09 11/1/2018 205.22 245 4905.07 4907.08 4701.86 10/3/2019 208.16 245 4905.07 4907.08 4698.92 10/21/2020 208.48 245 4905.07 4907.08 4698.60 10/20/2021 210.36 245 4905.07 4907.08 4696.72 8/15/2022 211.18 245 4905.07 4907.08 4695.90 GW-60 1/24/2013 178.75 202 4857.87 4860.97 4682.22 3/27/2013 178.72 202 4857.87 4860.97 4682.25 5/28/2013 178.75 202 4857.87 4860.97 4682.22 7/23/2013 178.82 202 4857.87 4860.97 4682.15 6/8/2015 181.52 202 4857.87 4860.97 4679.45 4/28/2016 181.28 202 4857.87 4860.97 4679.69 7/14/2016 181.19 202 4857.87 4860.97 4679.78 10/19/2016 181.11 202 4857.87 4860.97 4679.86 1/24/2017 181.11 202 4857.87 4860.97 4679.86 11/10/2017 180.01 202 4857.87 4860.97 4680.96 11/1/2018 180.38 202 4857.87 4860.97 4680.59 10/3/2019 180.87 202 4857.87 4860.97 4680.10 10/20/2020 180.67 202 4857.87 4860.97 4680.30 10/20/2021 182.12 202 4857.87 4860.97 4678.85 8/29/2022 182.2 202 4857.87 4860.97 4678.77 GW-61 1/24/2013 117.15 201.5 4881.79 4884.29 4767.14 3/27/2013 117.00 201.5 4881.79 4884.29 4767.29 5/28/2013 116.86 201.5 4881.79 4884.29 4767.43 7/23/2013 117.06 201.5 4881.79 4884.29 4767.23 6/8/2015 116.80 201.5 4881.79 4884.29 4767.49 4/28/2016 116.60 201.5 4881.79 4884.29 4767.69 7/14/2016 116.87 201.5 4881.79 4884.29 4767.42 10/19/2016 117.25 201.5 4881.79 4884.29 4767.04 1/24/2017 116.57 201.5 4881.79 4884.29 4767.72 11/10/2017 116.03 201.5 4881.79 4884.29 4768.26 11/1/2018 115.18 201.5 4881.79 4884.29 4769.11 10/3/2019 114.40 201.5 4881.79 4884.29 4769.89 10/21/2020 113.71 201.5 4881.79 4884.29 4770.58 10/20/2021 115.63 201.5 4881.79 4884.29 4768.66 8/15/2022 117.50 201.5 4881.79 4884.29 4766.79 Notes: All units in feet Elevations for ATK Launch Systems wells obtained from the well construction logs for these locations August 2022 groundwater elevations for ATK Launch System wells obtained from most recent monitoring data from ATK Launch Systems (ATK 2022). All elevations for Hercules wells based on May 2015 survey performed by Dominion Engineering. This updates prior survey conducted on wells HIMW-1 and 2 and BP-1, 2 and 3 completed in 2008. Page 3 of 3 Table 2 Hercules, LLC Former Bacchus Plant 3 Groundwater Sample Analytical Summary Well Date Screen Interval (ft) Depth of Pump Intake (ft)1, 1 , 1 T r i c h l o r o e t h a n e ( 1 , 1 , 1 T C A ) 1, 1 , 2 T r i c h l o r o e t h a n e 1, 2 , 4 T r i m e t h y l b e n z e n e 1, 2 , 3 T r i c h l o r o b e n z e n e 1, 1 D i c h l o r o e t h a n e ( 1 , 1 D C A ) 1, 1 D i c h l o r o e t h e n e ( 1 , 1 D C E ) 1, 2 D i c h l o r o e t h a n e ( 1 , 2 D C A ) 1, 4 D i o x a n e 2- B u t a n o n e ( M E K ) Ac e t o n e Be n z e n e Di c h l o r o b r o m o m e t h a n e Ca r b o n T e t r a c h l o r i d e Ch l o r o f o r m ci s 1 , 2 D i c h l o r o e t h e n e ( c i s - 1 , 2 D C E ) tr a n s 1 , 2 D i c h l o r o e t h e n e ( t r a n s - 1 , 2 D C E ) Et h y l b e n z e n e Me t h y l e n e C h l o r i d e Na p h t h a l e n e To l u e n e Te t r a c h l o r o e t h e n e ( P C E ) Tr i c h l o r o e t h e n e ( T C E ) HIMW-1 3/20/2008 330-350 340 < 0.50 < 0.50 < 0.50 NA < 0.50 < 0.50 < 0.50 NA < 2.0 4.6 < 0.50 < 0.50 < 0.50 < 0.50 < 0.50 < 0.50 0.04 J < 0.50 < 0.50 0.1 J < 0.50 0.08 J 1/25/2013 < 0.30 < 0.30 < 0.30 < 0.30 < 0.30 < 0.30 < 0.30 NA < 1.5 < 1.9 < 0.30 < 0.30 < 0.30 < 0.30 < 0.30 < 0.30 < 0.30 < 0.30 < 0.30 < 0.30 < 0.30 < 0.30 5/27/2015 < 0.16 < 0.27 < 0.15 < 0.21 < 0.22 0.32 J < 0.13 NA < 2.0 2.2 J < 0.16 < 0.17 < 0.19 < 0.16 < 0.15 < 0.15 < 0.16 < 0.32 < 0.22 < 0.17 < 0.20 < 0.16 4/25/2016 < 0.07 < 0.15 < 0.08 < 0.09 < 0.07 < 0.08 < 0.10 NA < 0.52 < 0.34 < 0.06 < 0.09 < 0.13 < 0.10 < 0.09 < 0.08 < 0.09 < 0.27 < 0.16 < 0.07 < 0.18 < 0.25 7/13/2016 < 0.17 < 0.13 < 0.17 < 0.17 < 0.07 < 0.10 < 0.22 NA < 0.47 < 0.55 < 0.10 < 0.14 < 0.18 < 0.10 < 0.10 < 0.10 < 0.12 < 0.27 < 0.21 < 0.14 < 0.18 < 0.25 10/18/2016 < 0.17 < 0.13 0.22 J < 0.17 < 0.07 < 0.10 < 0.22 NA < 0.47 < 0.55 < 0.10 < 0.14 < 0.18 < 0.10 < 0.10 < 0.10 < 0.12 < 0.27 < 0.21 < 0.14 < 0.18 < 0.25 1/24/2017 < 0.17 < 0.13 < 0.17 < 0.17 < 0.07 < 0.10 < 0.22 NA < 0.47 < 0.55 < 0.10 < 0.14 < 0.18 < 0.10 < 0.10 < 0.10 < 0.12 < 0.27 < 0.21 < 0.14 < 0.18 < 0.25 10/24/2017 < 0.17 < 0.13 < 0.17 < 0.17 < 0.07 < 0.10 < 0.22 NA < 0.47 < 0.55 < 0.10 < 0.14 < 0.18 < 0.10 < 0.10 < 0.10 < 0.12 < 0.27 < 0.21 < 0.14 < 0.18 < 0.25 10/1/2018 < 0.17 < 0.25 < 0.25 < 0.58 < 0.093 < 0.12 < 0.22 NA < 0.72 < 0.91 < 0.10 < 0.14 < 0.18 < 0.24 < 0.10 < 0.10 < 0.13 < 0.27 < 0.57 < 0.19 < 0.19 < 0.25 10/3/2019 < 0.25 < 0.25 < 0.25 < 0.48 < 0.25 < 0.27 < 0.23 NA < 0.72 < 0.94 < 0.26 < 0.17 < 0.19 < 0.24 < 0.23 < 0.26 < 0.34 < 0.27 < 0.57 < 0.24 < 0.31 < 0.31 10/22/2020 < 0.60 < 0.45 < 0.48 < 1.1 < 0.31 < 0.55 < 0.57 NA < 2.6 < 3.4 < 0.60 < 0.64 < 0.88 < 0.60 < 0.71 < 0.67 < 0.51 < 0.89 < 0.84 < 0.46 < 0.47 < 0.69 10/13/2021 < 0.60 < 0.45 < 0.48 < 1.1 < 0.31 < 0.55 < 0.57 < 0.27 < 2.6 < 3.4 < 0.60 < 0.64 < 0.88 < 0.60 < 0.71 < 0.67 < 0.51 < 0.89 < 0.84 < 0.46 < 0.47 < 0.69 10/12/2022 < 0.39 < 0.27 < 0.15 < 0.70 < 0.22 < 0.23 < 0.54 < 0.27 < 5.9 < 6.6 < 0.34 < 0.39 < 0.57 < 0.36 < 0.32 < 0.37 < 0.30 < 0.94 < 0.63 < 0.32 < 0.40 < 0.30 10/30/2023 < 0.39 < 0.27 < 0.15 < 0.70 < 0.22 < 0.23 < 0.54 < 0.24 < 6.0 < 6.6 < 0.31 < 0.39 < 0.57 < 0.36 < 0.32 < 0.37 < 0.30 < 0.94 < 0.63 < 0.32 < 0.40 < 0.30 HIMW-2 3/19/2008 209-229 219 7.4 5.1 < 0.50 NA 1.3 23 4.3 NA < 2.0 2.4 0.2 J 0.5 J 1.5 3.2 0.08 J 0.2 J < 0.50 1.1 < 0.50 0.04 J < 0.50 190 1/25/2013 3.9 4.3 < 0.30 < 0.30 0.69 J 20 3.8 NA < 1.5 < 1.9 < 0.30 < 0.30 1.8 2.3 < 0.30 < 0.30 < 0.30 0.86 J < 0.30 < 0.30 < 0.30 250 5/27/2015 2.2 J 4.0 J < 1.5 < 2.1 < 2.2 14 5.2 J NA < 20 < 19 < 1.6 < 1.7 1.9 2.0 J < 1.5 < 1.5 < 1.6 5.2 J B < 2.2 < 1.7 < 2.0 240 4/25/2016 1.7 3.1 < 0.08 < 0.09 0.34 J 6.2 6.4 NA < 0.52 < 0.34 < 0.06 < 0.09 1.2 1.5 < 0.09 < 0.08 < 0.09 1.4 < 0.16 < 0.07 < 0.18 150 7/13/2016 1.1 3.2 < 0.17 < 0.17 0.33 J 6.8 6.2 NA < 0.47 2.9 < 0.10 < 0.14 0.71 J 1.4 < 0.10 < 0.10 < 0.12 1.5 < 0.21 < 0.14 < 0.18 110 10/18/2016 1.3 3.0 < 0.17 < 0.17 0.32 J 9.6 7.3 NA < 0.47 0.84 J < 0.10 < 0.14 1.1 1.4 < 0.10 < 0.10 < 0.12 1.5 < 0.21 < 0.14 < 0.18 140 1/24/2017 < 0.17 2.3 < 0.17 < 0.17 < 0.07 6.4 7.0 NA < 0.47 < 0.55 < 0.10 < 0.14 0.69 J 1.1 < 0.10 < 0.10 < 0.12 1.3 < 0.21 < 0.14 < 0.18 120 10/24/2017 < 0.17 2.6 < 0.17 < 0.17 < 0.07 6.4 7.5 NA 1.3 J 2.1 < 0.10 < 0.14 0.72 J 1.1 < 0.10 < 0.10 < 0.12 1.5 < 0.21 < 0.14 < 0.18 120 10/1/2018 < 0.17 1.9 < 0.25 < 0.58 < 0.093 5.3 < 0.22 NA < 0.72 < 0.91 < 0.10 < 0.14 0.60 J 0.81 J < 0.10 < 0.10 < 0.13 1.1 < 0.57 < 0.19 < 0.19 97 10/3/2019 0.41 J 1.5 < 0.25 < 0.48 < 0.25 3.7 7.8 NA < 0.72 4.6 < 0.26 < 0.17 0.50 J 0.66 J < 0.23 < 0.26 < 0.34 1.1 < 0.57 < 0.24 < 0.31 83 10/22/2020 < 0.60 0.72 J < 0.48 < 1.1 < 0.31 2.8 5.1 NA < 2.6 < 3.4 < 0.60 < 0.64 < 0.88 < 0.60 < 0.71 < 0.67 < 0.51 1.1 < 0.84 < 0.46 < 0.47 75 E Page 1 of 3 Table 2 Hercules, LLC Former Bacchus Plant 3 Groundwater Sample Analytical Summary Well Date Screen Interval (ft) Depth of Pump Intake (ft)1, 1 , 1 T r i c h l o r o e t h a n e ( 1 , 1 , 1 T C A ) 1, 1 , 2 T r i c h l o r o e t h a n e 1, 2 , 4 T r i m e t h y l b e n z e n e 1, 2 , 3 T r i c h l o r o b e n z e n e 1, 1 D i c h l o r o e t h a n e ( 1 , 1 D C A ) 1, 1 D i c h l o r o e t h e n e ( 1 , 1 D C E ) 1, 2 D i c h l o r o e t h a n e ( 1 , 2 D C A ) 1, 4 D i o x a n e 2- B u t a n o n e ( M E K ) Ac e t o n e Be n z e n e Di c h l o r o b r o m o m e t h a n e Ca r b o n T e t r a c h l o r i d e Ch l o r o f o r m ci s 1 , 2 D i c h l o r o e t h e n e ( c i s - 1 , 2 D C E ) tr a n s 1 , 2 D i c h l o r o e t h e n e ( t r a n s - 1 , 2 D C E ) Et h y l b e n z e n e Me t h y l e n e C h l o r i d e Na p h t h a l e n e To l u e n e Te t r a c h l o r o e t h e n e ( P C E ) Tr i c h l o r o e t h e n e ( T C E ) HIMW-2 (cont.) 10/22/2020 < 3.0 H < 2.3 H < 2.4 H < 5.3 H < 1.5 H 3.3 J H 6.9 H NA < 13 H < 17 H < 3.0 H < 3.2 H < 4.4 H < 3.0 H < 3.5 H < 3.4 H < 2.5 H 4.4 J H < 4.2 H < 2.3 H < 2.3 H 79 H 10/13/2021 < 0.60 0.77 J < 0.48 < 1.1 < 0.31 2.0 5.9 3.0 < 2.6 < 3.4 < 0.60 < 0.64 < 0.88 < 0.60 < 0.71 < 0.67 < 0.51 1.0 < 0.84 < 0.46 < 0.47 45 10/12/2022 < 0.39 0.81 J < 0.15 < 0.70 < 0.22 2.7 6.0 2.6 < 5.9 < 6.6 < 0.31 < 0.39 < 0.57 0.43 J < 0.32 < 0.37 < 0.30 < 0.94 < 0.63 < 0.32 < 0.40 44 10/30/2023 < 0.39 1.5 < 0.15 < 0.70 < 0.22 4.0 6.5 3.7 < 6.0 < 6.6 < 0.31 < 0.39 < 0.57 0.69 J < 0.32 < 0.37 < 0.30 < 0.94 < 0.36 < 0.32 < 0.40 85 F1 HIMW-3 5/27/2015 258.6-278.6 268.6 40 < 1.1 < 0.60 < 0.84 < 0.88 94 < 0.52 NA < 8.0 < 7.6 < 0.64 < 0.68 < 0.76 < 0.64 < 0.60 < 0.60 < 0.64 < 1.3 < 0.88 < 0.68 < 0.80 < 0.64 4/25/2016 23 < 0.15 < 0.08 < 0.09 < 0.07 57 < 0.10 NA < 0.52 < 0.34 < 0.06 < 0.09 < 0.13 0.10 J < 0.09 < 0.08 < 0.09 < 0.27 0.34 J B < 0.07 < 0.18 < 0.25 7/13/2016 23 < 0.13 < 0.17 < 0.17 < 0.07 59 < 0.22 NA < 0.47 < 0.55 < 0.10 < 0.14 < 0.18 0.12 J < 0.10 < 0.10 < 0.12 < 0.27 0.32 J < 0.14 < 0.18 < 0.25 10/18/2016 24 < 0.13 < 0.17 < 0.17 < 0.07 55 < 0.22 NA < 0.47 1.1 J < 0.10 < 0.14 < 0.18 0.14 J < 0.10 < 0.10 < 0.12 < 0.27 < 0.21 < 0.14 < 0.18 < 0.25 1/24/2017 17 < 0.13 < 0.17 0.32 J B < 0.07 54 < 0.22 NA < 0.47 < 0.55 < 0.10 < 0.14 < 0.18 < 0.10 < 0.10 < 0.10 < 0.12 < 0.27 < 0.21 < 0.14 < 0.18 < 0.25 10/24/2017 12 < 0.13 < 0.17 < 0.17 < 0.07 48 < 0.22 NA < 0.47 0.78 J < 0.10 < 0.14 < 0.18 < 0.10 < 0.10 < 0.10 < 0.12 < 0.27 < 0.21 < 0.14 < 0.18 < 0.25 10/1/2018 10 < 0.25 < 0.25 < 0.58 < 0.093 46 < 0.22 NA < 0.72 1.8 J < 0.10 < 0.14 < 0.18 < 0.24 < 0.10 < 0.10 < 0.13 < 0.27 < 0.57 < 0.19 < 0.19 < 0.25 10/3/2019 8.5 < 0.25 < 0.25 < 0.48 < 0.25 45 < 0.23 NA < 0.72 2.8 < 0.26 < 0.17 < 0.19 < 0.24 < 0.23 < 0.26 < 0.34 < 0.27 < 0.57 < 0.24 < 0.31 < 0.31 10/22/2020 6.5 < 0.45 < 0.48 < 1.1 < 0.31 47 < 0.31 NA < 2.6 < 3.4 < 0.60 < 0.64 < 0.88 < 0.60 < 0.71 < 0.67 < 0.51 < 0.89 < 0.84 < 0.46 < 0.47 < 0.69 10/13/2021 8.4 < 0.45 < 0.48 < 1.1 < 0.31 46 < 0.57 0.79 J < 2.6 < 3.4 < 0.60 < 0.64 < 0.88 < 0.60 < 0.71 < 0.67 < 0.51 < 0.89 < 0.84 < 0.46 < 0.47 < 0.69 10/12/2022 16 < 0.27 < 0.15 < 0.70 < 0.22 100 < 0.54 < 0.27 < 5.9 < 6.6 < 0.31 < 0.39 < 0.57 < 0.36 < 0.32 < 0.37 < 0.30 < 0.94 < 0.63 < 0.32 < 0.40 < 0.30 10/30/2023 18 < 0.27 < 0.15 < 0.70 < 0.22 140 < 0.54 4.2 < 6.0 < 6.6 < 0.31 < 0.39 < 0.57 < 0.36 < 0.32 < 0.37 < 0.30 < 0.94 < 0.63 < 0.32 < 0.40 < 0.30 HIMW-4 (Abandoned) 5/27/2015 271.8-291.8 281.8 1.5 < 0.27 < 0.15 < 0.21 0.45 J 9.7 0.32 J NA < 2.0 < 1.9 < 0.16 0.34 J < 0.19 1.8 < 0.15 < 0.15 < 0.16 < 0.32 0.98 J < 0.17 0.40 J 2.9 4/26/2016 0.76 J *< 0.15 < 0.08 < 0.09 0.22 J 5.2 0.22 J NA < 0.52 < 0.34 < 0.06 0.26 J < 0.13 1.3 < 0.09 < 0.08 < 0.09 < 0.27 0.45 J B < 0.07 < 0.18 1.6 7/14/2016 0.79 J < 0.13 < 0.17 < 0.17 0.23 J 5.5 0.24 J NA < 0.47 9.3 J < 0.10 0.27 J < 0.18 1.4 < 0.10 < 0.10 < 0.12 < 0.27 0.32 J < 0.14 < 0.18 2.0 10/19/2016 0.53 J < 0.13 0.28 J < 0.17 0.20 J 3.7 < 0.22 NA < 0.47 3.1 < 0.10 0.25 J < 0.18 1.2 < 0.10 < 0.10 < 0.12 < 0.27 0.84 J < 0.14 < 0.18 1.4 1/25/2017 0.53 J < 0.13 < 0.17 < 0.17 < 0.07 4.2 < 0.22 NA < 0.47 < 0.55 < 0.10 0.24 J < 0.18 1.2 < 0.10 < 0.10 < 0.12 < 0.27 < 0.21 < 0.14 < 0.18 1.6 HIMW-5 5/27/2015 244.9-264.9 254.9 4.9 < 0.27 < 0.15 < 0.21 0.30 J 23 < 0.13 NA < 2.0 < 1.9 < 0.16 0.36 J < 0.19 2.0 < 0.15 < 0.15 < 0.16 < 0.32 0.30 J < 0.17 < 0.20 0.46 J 4/26/2016 4.2 < 0.15 < 0.08 < 0.09 0.25 J 16 < 0.10 NA < 0.52 < 0.34 < 0.06 0.34 J < 0.13 2.0 < 0.09 < 0.08 < 0.09 < 0.27 < 0.16 < 0.07 < 0.18 0.35 J 7/13/2016 4.4 < 0.13 < 0.17 < 0.17 0.24 J 22 < 0.22 NA < 0.47 1.8 J < 0.10 0.41 J < 0.18 2.3 < 0.10 < 0.10 < 0.12 < 0.27 < 0.21 < 0.14 < 0.18 0.43 J 10/18/2016 4.0 < 0.13 0.28 J < 0.17 0.31 J 22 < 0.22 NA < 0.47 1.8 J < 0.10 0.52 J < 0.18 2.2 < 0.10 < 0.10 < 0.12 < 0.27 < 0.21 < 0.14 < 0.18 0.37 J Page 2 of 3 Table 2 Hercules, LLC Former Bacchus Plant 3 Groundwater Sample Analytical Summary Well Date Screen Interval (ft) Depth of Pump Intake (ft)1, 1 , 1 T r i c h l o r o e t h a n e ( 1 , 1 , 1 T C A ) 1, 1 , 2 T r i c h l o r o e t h a n e 1, 2 , 4 T r i m e t h y l b e n z e n e 1, 2 , 3 T r i c h l o r o b e n z e n e 1, 1 D i c h l o r o e t h a n e ( 1 , 1 D C A ) 1, 1 D i c h l o r o e t h e n e ( 1 , 1 D C E ) 1, 2 D i c h l o r o e t h a n e ( 1 , 2 D C A ) 1, 4 D i o x a n e 2- B u t a n o n e ( M E K ) Ac e t o n e Be n z e n e Di c h l o r o b r o m o m e t h a n e Ca r b o n T e t r a c h l o r i d e Ch l o r o f o r m ci s 1 , 2 D i c h l o r o e t h e n e ( c i s - 1 , 2 D C E ) tr a n s 1 , 2 D i c h l o r o e t h e n e ( t r a n s - 1 , 2 D C E ) Et h y l b e n z e n e Me t h y l e n e C h l o r i d e Na p h t h a l e n e To l u e n e Te t r a c h l o r o e t h e n e ( P C E ) Tr i c h l o r o e t h e n e ( T C E ) HIMW-5 (cont.) 1/25/2017 3.2 < 0.13 < 0.17 < 0.17 < 0.07 19 < 0.22 NA < 0.47 < 0.55 < 0.10 0.38 J < 0.18 2.0 < 0.10 < 0.10 < 0.12 < 0.27 < 0.21 < 0.14 < 0.18 < 0.25 10/24/2017 3.3 < 0.13 < 0.17 < 0.17 < 0.07 24 < 0.22 NA < 0.47 < 0.55 < 0.10 0.49 J < 0.18 2.5 < 0.10 < 0.10 < 0.12 < 0.27 < 0.21 < 0.14 < 0.18 < 0.25 10/1/2018 2.7 < 0.25 < 0.25 < 0.58 < 0.093 22 < 0.22 NA < 0.72 1.5 J < 0.10 0.38 J < 0.18 2.1 < 0.10 < 0.10 < 0.13 < 0.27 < 0.57 < 0.19 < 0.19 < 0.25 10/3/2019 2.3 < 0.25 < 0.25 < 0.48 < 0.25 20 < 0.23 NA < 0.72 3.2 < 0.26 0.40 J < 0.19 2.3 < 0.23 < 0.26 < 0.34 < 0.27 < 0.57 < 0.24 < 0.31 < 0.31 10/21/2020 1.5 < 0.45 < 0.48 < 1.1 < 0.31 19 F1 < 0.57 NA < 2.6 < 3.4 < 0.60 < 0.64 < 0.88 1.8 <0.71 * F1 <0.67 F1 < 0.51 < 0.89 < 0.84 < 0.46 < 0.47 <0.69 F1 10/13/2021 1.1 < 0.45 < 0.48 < 1.1 F2 < 0.31 14 < 0.57 16 < 2.6 < 3.4 < 0.60 < 0.64 < 0.88 1.4 < 0.71 <0.67 F1 < 0.51 < 0.89 < 0.84 F2 < 0.46 < 0.47 < 0.69 10/12/2022 1.6 < 0.27 < 0.15 < 0.70 < 0.22 23 < 0.54 16 < 5.9 < 6.6 < 0.31 0.59 J < 0.57 2.5 < 0.32 < 0.37 < 0.30 < 0.94 < 0.63 < 0.32 < 0.40 < 0.30 10/30/2023 1.3 < 0.27 < 0.15 < 0.70 < 0.22 18 < 0.54 13 < 6.0 < 6.6 < 0.31 < 0.39 < 0.57 2.2 < 0.32 < 0.37 < 0.30 < 0.94 < 0.63 < 0.32 < 0.40 < 0.30 200 5 NS NS NS 7 5 NS NS NS 5 80 5 80 70 100 700 5 NS 1,000 5 5 EPA RSL for Tap Water Ingestionb - - 56 7 2.8 - - 0.46 5,600 18,000 ---- - ---0.12 - - - Notes: All concentrations reported in ug/L NS = No Standard J = Estimated concentration detected below laboratory reporting limit NA = Not Analyzed. B = Compound was found in the blank and sample aUSEPA Maximum Contaminant Level (MCL) for drinking water E = Result exceeds calibration range bUSEPA Regional Screening Levels (RSL) for tap water ingestions (updated by EPA May 2022). H = Sample was prepped or analyzed outside of the specified holding time F1 = MS and/or MSD recovery exceeds control limit Table shows detected compounds only F2 = MS/MSD RPD exceeds control limits * = LCS or LCSD is outside acceptance limits USEPA MCLa Concentrations highlighted in yellow exceed USEPA MCL or USEPA RSL for tap water ingestion. USEPA RSL for tap water is only applied when MCL has not been established. Page 3 of 3 Table 4 Hercules, LLC Summary of Groundwater Statistical Trend Evaluation Former Bacchus Plant 3 Analyte Units Well ID # of Samples # of Detections Mean Median Max Coefficient of Variation First Sample Date Last Sample Date Mann-Kendall S Statistics p_value Confidence Factor Trend Analysis Result (2023) UG/L HIMW-1 14 0 - - - - 3/20/2008 10/30/2023 - - NA Stable UG/L HIMW-2 14 5 0.60 0.34 1.3 0.82 3/19/2008 10/30/2023 -49 0 100%Decreasing UG/L HIMW-3 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-5 12 4 0.28 0.28 0.31 0.13 5/27/2015 10/30/2023 -32 0.01 99%Decreasing UG/L HIMW-1 14 1 0.32 0.32 0.32 0.10 3/20/2008 10/30/2023 -9 0.16 84%Stable UG/L HIMW-2 14 14 8.1 6.3 23 0.77 3/19/2008 10/30/2023 -70 0 100%Decreasing UG/L HIMW-3 12 12 66 55 140 0.43 5/27/2015 10/30/2023 -15 0.17 83%Stable UG/L HIMW-5 12 12 20 21 24 0.15 5/27/2015 10/30/2023 -15 0.17 83%Stable UG/L HIMW-1 14 0 - - - - 3/20/2008 10/30/2023 - - NA Stable UG/L HIMW-2 14 7 2.6 1.7 7.4 1.4 3/19/2008 10/30/2023 -62 0 100%Decreasing UG/L HIMW-3 12 12 17 17 40 0.53 5/27/2015 10/30/2023 -35 0.01 99%Decreasing UG/L HIMW-5 12 12 2.9 3.0 4.9 0.44 5/27/2015 10/30/2023 -56 0 100%Decreasing UG/L HIMW-1 14 0 - - - - 3/20/2008 10/30/2023 - - NA Stable UG/L HIMW-2 14 14 2.5 2.5 5.1 0.54 3/19/2008 10/30/2023 -74 0 100%Decreasing UG/L HIMW-3 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-5 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-1 14 0 - - - - 3/20/2008 10/30/2023 - - NA Stable UG/L HIMW-2 14 13 6.2 6.4 7.8 0.33 3/19/2008 10/30/2023 23 0.11 89% No Trend UG/L HIMW-3 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-5 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-1 13 0 - - - - 1/25/2013 10/30/2023 - - NA Stable UG/L HIMW-2 13 0 - - - - 1/25/2013 10/30/2023 - - NA Stable UG/L HIMW-3 12 1 0.48 0.48 0.48 0.00 5/27/2015 10/30/2023 0 0.50 50%Stable UG/L HIMW-5 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-1 14 1 0.22 0.22 0.22 0.07 3/20/2008 10/30/2023 -3 0.40 60%Stable UG/L HIMW-2 14 0 - - - - 3/19/2008 10/30/2023 - - NA Stable UG/L HIMW-3 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-5 12 1 0.28 0.28 0.28 0.17 5/27/2015 10/30/2023 -5 0.28 72%Stable UG/L HIMW-1 14 2 3.6 3.6 4.6 0.18 3/20/2008 10/30/2023 -13 0.07 93%Probably Decreasing UG/L HIMW-2 14 5 3.1 2.7 4.6 0.18 3/19/2008 10/30/2023 1 0.50 50% No Trend UG/L HIMW-3 12 4 2.7 2.7 2.8 0.02 5/27/2015 10/30/2023 3 0.39 61% No Trend UG/L HIMW-5 12 4 2.8 2.7 3.2 0.06 5/27/2015 10/30/2023 3 0.39 61% No Trend UG/L HIMW-1 14 0 - - - - 3/20/2008 10/30/2023 - - NA Stable UG/L HIMW-2 14 1 0.21 0.21 0.21 0.00 3/19/2008 10/30/2023 0 0.50 50%Stable UG/L HIMW-3 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-5 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-1 14 0 - - - - 3/20/2008 10/30/2023 - - NA Stable UG/L HIMW-2 14 10 1.1 0.91 1.9 0.70 3/19/2008 10/30/2023 -73 0 100%Decreasing UG/L HIMW-3 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-5 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-1 14 0 - - - - 3/20/2008 10/30/2023 - - NA Stable UG/L HIMW-2 14 12 1.4 1.3 3.2 0.64 3/19/2008 10/30/2023 -76 0 100%Decreasing UG/L HIMW-3 12 3 0.33 0.33 0.33 0.00 5/27/2015 10/30/2023 0 0.50 50%Stable UG/L HIMW-5 12 12 2.1 2.2 2.5 0.14 5/27/2015 10/30/2023 4 0.42 58% No Trend UG/L HIMW-1 14 0 - - - - 3/20/2008 10/30/2023 - - NA Stable UG/L HIMW-2 14 1 0.19 0.19 0.19 0.00 3/19/2008 10/30/2023 0 0.50 50%Stable UG/L HIMW-3 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-5 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-1 14 0 - - - - 3/20/2008 10/30/2023 - - NA Stable UG/L HIMW-2 14 1 0.50 0.50 0.50 0.44 3/19/2008 10/30/2023 -13 0.07 93%Probably Decreasing UG/L HIMW-3 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-5 12 9 0.43 0.40 0.59 0.36 5/27/2015 10/30/2023 -7 0.34 66%Stable UG/L HIMW-1 14 1 0.23 0.23 0.23 0.00 3/20/2008 10/30/2023 0 0.50 50%Stable UG/L HIMW-2 14 0 - - - - 3/19/2008 10/30/2023 - - NA Stable UG/L HIMW-3 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-5 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable Carbon Tetrachloride Chloroform cis-1,2 DCE Dichlorobromomethane Ethylbenzene 1,2,3 Trichlorobenzene 1,2,4 Trimethylbenzene Acetone Benzene 1,1 DCA 1,1 DCE 1,1,1 TCA 1,1,2 Trichloroethane 1,2 DCA 1 Table 4 Hercules, LLC Summary of Groundwater Statistical Trend Evaluation Former Bacchus Plant 3 Analyte Units Well ID # of Samples # of Detections Mean Median Max Coefficient of Variation First Sample Date Last Sample Date Mann-Kendall S Statistics p_value Confidence Factor Trend Analysis Result (2023) UG/L HIMW-1 14 0 - - - - 3/20/2008 10/30/2023 - - NA Stable UG/L HIMW-2 14 1 1.3 1.3 1.3 0.20 3/19/2008 10/30/2023 1 0.50 50% No Trend UG/L HIMW-3 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-5 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-1 14 0 - - - - 3/20/2008 10/30/2023 - - NA Stable UG/L HIMW-2 14 12 1.8 1.4 5.2 0.85 3/19/2008 10/30/2023 -28 0.07 93%Probably Decreasing UG/L HIMW-3 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-5 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-1 14 0 - - - - 3/20/2008 10/30/2023 - - NA Stable UG/L HIMW-2 14 0 - - - - 3/19/2008 10/30/2023 - - NA Stable UG/L HIMW-3 12 2 0.57 0.57 0.57 0.00 5/27/2015 10/30/2023 0 0.50 50%Stable UG/L HIMW-5 12 1 0.57 0.57 0.57 0.00 5/27/2015 10/30/2023 0 0.50 50%Stable UG/L HIMW-1 14 0 - - - - 3/20/2008 10/30/2023 - - NA Stable UG/L HIMW-2 14 0 - - - - 3/19/2008 10/30/2023 - - NA Stable UG/L HIMW-3 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-5 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-1 14 1 0.30 0.30 0.30 0.00 3/20/2008 10/30/2023 0 0.50 50%Stable UG/L HIMW-2 14 14 125 115 250 0.49 3/19/2008 10/30/2023 -72 0 100%Decreasing UG/L HIMW-3 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-5 12 4 0.40 0.40 0.46 0.16 5/27/2015 10/30/2023 -34 0 100%Decreasing UG/L HIMW-1 14 1 0.19 0.19 0.19 0.00 3/20/2008 10/30/2023 0 0.50 50%Stable UG/L HIMW-2 14 1 0.19 0.19 0.19 0.00 3/19/2008 10/30/2023 0 0.50 50%Stable UG/L HIMW-3 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-5 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-1 14 0 - - - - 3/20/2008 10/30/2023 - - NA Stable UG/L HIMW-2 14 1 0.21 0.21 0.21 0.00 3/19/2008 10/30/2023 0 0.50 50%Stable UG/L HIMW-3 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable UG/L HIMW-5 12 0 - - - - 5/27/2015 10/30/2023 - - NA Stable Notes: 1,1 DCA=1,1 Dichloroethane NA = Not Applicable 1,1 DCE=1,1 Dichloroethene If compound is not detected, the trend is assumed to be stable 1,1,1 TCA=1,1,1 Trichloroethane 1,2 DCA=1,2 Dichloroethane cis-1,2 DCE=cis 1,2 Dichloroethene MEK=2-Butanone PCE=Tetrachloroethene TCE=Trichloroethene trans-1,2 DCE=trans 1,2 Dichloroethene ft = feet UG/L = micrograms per liter MEK Methylene Chloride trans-1,2 DCE PCE TCE Toluene Naphthalene 2 APPENDIX A Monitoring Well Purge Logs APPENDIX B Laboratory Analytical Report ANALYTICAL REPORT PREPARED FOR Attn: Brian Smith Geosyntec Consultants Inc 215 South State Street Suite 500 Salt Lake City, Utah 84111 Generated 11/13/2023 10:41:48 AM JOB DESCRIPTION Ashland Former Bacchus Plant 3 Utah JOB NUMBER 280-183916-1 See page two for job notes and contact information. Arvada CO 80002 4955 Yarrow Street Eurofins Denver Page 1 of 34 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Eurofins Denver Eurofins Denver is a laboratory within TestAmerica Laboratories, Inc., a company within Eurofins Environment Testing Group of Companies Job Notes This report may not be reproduced except in full, and with written approval from the laboratory. The results relate only to the samples tested. For questions please contact the Project Manager at the e-mail address or telephone number listed on this page. The test results in this report relate only to the samples as received by the laboratory and will meet all requirements of the methodology, with any exceptions noted. This report shall not be reproduced except in full, without the express written approval of the laboratory. All questions should be directed to the Eurofins TestAmerica Project Manager. Authorization Generated 11/13/2023 10:41:48 AM Authorized for release by Shelby Turner, Project Manager I Shelby.Turner@et.eurofinsus.com (303)736-0165 Page 2 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Table of Contents Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Laboratory Job ID: 280-183916-1 Page 3 of 34 Eurofins Denver 11/13/2023 Cover Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Case Narrative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Detection Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Method Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 Sample Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 Client Sample Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 Surrogate Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 QC Sample Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 QC Association . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 Chronicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 Certification Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 Chain of Custody . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 Receipt Checklists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Definitions/Glossary Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Qualifiers GC/MS VOA Qualifier Description F1 MS and/or MSD recovery exceeds control limits. Qualifier F2 MS/MSD RPD exceeds control limits J Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value. U Indicates the analyte was analyzed for but not detected. Glossary These commonly used abbreviations may or may not be present in this report. ¤Listed under the "D" column to designate that the result is reported on a dry weight basis Abbreviation %R Percent Recovery CFL Contains Free Liquid CFU Colony Forming Unit CNF Contains No Free Liquid DER Duplicate Error Ratio (normalized absolute difference) Dil Fac Dilution Factor DL Detection Limit (DoD/DOE) DL, RA, RE, IN Indicates a Dilution, Re-analysis, Re-extraction, or additional Initial metals/anion analysis of the sample DLC Decision Level Concentration (Radiochemistry) EDL Estimated Detection Limit (Dioxin) LOD Limit of Detection (DoD/DOE) LOQ Limit of Quantitation (DoD/DOE) MCL EPA recommended "Maximum Contaminant Level" MDA Minimum Detectable Activity (Radiochemistry) MDC Minimum Detectable Concentration (Radiochemistry) MDL Method Detection Limit ML Minimum Level (Dioxin) MPN Most Probable Number MQL Method Quantitation Limit NC Not Calculated ND Not Detected at the reporting limit (or MDL or EDL if shown) NEG Negative / Absent POS Positive / Present PQL Practical Quantitation Limit PRES Presumptive QC Quality Control RER Relative Error Ratio (Radiochemistry) RL Reporting Limit or Requested Limit (Radiochemistry) RPD Relative Percent Difference, a measure of the relative difference between two points TEF Toxicity Equivalent Factor (Dioxin) TEQ Toxicity Equivalent Quotient (Dioxin) TNTC Too Numerous To Count Eurofins Denver Page 4 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Case Narrative Client: Geosyntec Consultants Inc Job ID: 280-183916-1 Project/Site: Ashland Former Bacchus Plant 3 Utah Job ID: 280-183916-1 Laboratory: Eurofins Denver Narrative CASE NARRATIVE Client: Geosyntec Consultants Inc Project: Ashland Former Bacchus Plant 3 Utah Report Number: 280-183916-1 With the exceptions noted as flags or footnotes, standard analytical protocols were followed in the analysis of the samples and no problems were encountered or anomalies observed. In addition all laboratory quality control samples were within established control limits, with any exceptions noted below. Each sample was analyzed to achieve the lowest possible reporting limit within the constraints of the method. In some cases, due to interference or analytes present at high concentrations, samples were diluted. For diluted samples, the reporting limits are adjusted relative to the dilution required. Calculations are performed before rounding to avoid round-off errors in calculated results. All holding times were met and proper preservation noted for the methods performed on these samples, unless otherwise detailed in the individual sections below. RECEIPT The samples were received on 11/1/2023 9:45 AM. Unless otherwise noted below, the samples arrived in good condition, and where required, properly preserved and on ice. The temperature of the cooler at receipt was 1.0º C. Receipt Exceptions The following samples were received with a headspace bubble in their VOA Vial container(s): HIMW2-GW-1023 (280-183916-2), HIMW3-GW-1023 (280-183916-3) and HIMW11-GW-1023 (280-183916-6): 1 of 6 VOA Vials with a headspace bubble. HIMW2-GW-1023 (280-183916-2) (MSD): 1 of 3 VOA Vials with a headspace bubble Use of containers with headspace for analysis must be narrated by analytical staff. VOLATILE ORGANIC COMPOUNDS (GC-MS) Samples HIMW1-GW-1023 (280-183916-1), HIMW2-GW-1023 (280-183916-2), HIMW3-GW-1023 (280-183916-3), HIMW5-GW-1023 (280-183916-4), TRIP BLANK 1023 (280-183916-5) and HIMW11-GW-1023 (280-183916-6) were analyzed for volatile organic compounds (GC-MS) in accordance with EPA SW-846 Method 8260D. The samples were analyzed on 11/10/2023 and 11/11/2023. Trichloroethene failed the recovery criteria low for the MS of sample HIMW2-GW-1023 (280-183916-2) in batch 280-633533. Trichloroethene failed the recovery criteria low for the MSD of sample HIMW2-GW-1023 (280-183916-2) in batch 280-633533. Chloromethane exceeded the RPD limit. Refer to the QC report for details. Sample matrix interference and/or non-homogeneity are suspected because the associated laboratory control sample (LCS) and duplicate (LCSD) recoveries are within acceptance limits. The following compounds were outside control limits (20%D) in the continuing calibration verification (CCV) associated with batch 280-633533: Chloroethane (-20.2%D) and Chloromethane (-22%D). These are considered poor performers and are within control limits in the LCS and LCSD. The method requirement for no headspace was not met. The following volatile sample in batch 280-633533 were analyzed with significant headspace in the sample container(s): HIMW5-GW-1023 (280-183916-4). Significant headspace is defined as a bubble greater than 6mm in diameter. Eurofins Denver Page 5 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Case Narrative Client: Geosyntec Consultants Inc Job ID: 280-183916-1 Project/Site: Ashland Former Bacchus Plant 3 Utah Job ID: 280-183916-1 (Continued) Laboratory: Eurofins Denver (Continued) The following compound was outside control limits in the continuing calibration verification (CCV) associated with batch 280-633533: Dichlorodifluoromethane (-27%D, limit 20%D). This is considered a poor performer and is within control limits in the LCS and LCSD. No additional analytical or quality issues were noted, other than those described above or in the Definitions/Glossary page. 1,4 DIOXANE (GC/MS SIM) Samples HIMW1-GW-1023 (280-183916-1), HIMW2-GW-1023 (280-183916-2), HIMW3-GW-1023 (280-183916-3), HIMW5-GW-1023 (280-183916-4), TRIP BLANK 1023 (280-183916-5) and HIMW11-GW-1023 (280-183916-6) were analyzed for 1,4 Dioxane (GC/MS SIM) in accordance with 8260D_SIM. The samples were analyzed on 11/09/2023. No analytical or quality issues were noted, other than those described above or in the Definitions/Glossary page. Eurofins Denver Page 6 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Detection Summary Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Client Sample ID: HIMW1-GW-1023 Lab Sample ID: 280-183916-1 No Detections. Client Sample ID: HIMW2-GW-1023 Lab Sample ID: 280-183916-2 1,4-Dioxane RL 1.4 ug/L MDL 0.24 Analyte Result Qualifier Unit Dil Fac D Method Prep Type Total/NA13.7 8260D SIM 1,1,2-Trichloroethane 1.0 ug/L0.27 Total/NA11.5 8260D 1,1-Dichloroethene 1.0 ug/L0.23 Total/NA14.0 8260D 1,2-Dichloroethane 1.0 ug/L0.54 Total/NA16.5 8260D Chloroform 1.0 ug/L0.36 Total/NA10.69 J 8260D Trichloroethene 1.0 ug/L0.30 Total/NA185F18260D Client Sample ID: HIMW3-GW-1023 Lab Sample ID: 280-183916-3 1,4-Dioxane RL 1.4 ug/L MDL 0.24 Analyte Result Qualifier Unit Dil Fac D Method Prep Type Total/NA14.2 8260D SIM 1,1,1-Trichloroethane 1.0 ug/L0.39 Total/NA1188260D 1,1-Dichloroethene 1.0 ug/L0.23 Total/NA11408260D Client Sample ID: HIMW5-GW-1023 Lab Sample ID: 280-183916-4 1,4-Dioxane RL 1.4 ug/L MDL 0.24 Analyte Result Qualifier Unit Dil Fac D Method Prep Type Total/NA1138260D SIM 1,1,1-Trichloroethane 1.0 ug/L0.39 Total/NA11.3 8260D 1,1-Dichloroethene 1.0 ug/L0.23 Total/NA1188260D Chloroform 1.0 ug/L0.36 Total/NA12.2 8260D Client Sample ID: TRIP BLANK 1023 Lab Sample ID: 280-183916-5 No Detections. Client Sample ID: HIMW11-GW-1023 Lab Sample ID: 280-183916-6 No Detections. Eurofins Denver This Detection Summary does not include radiochemical test results. Page 7 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Method Summary Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method Method Description LaboratoryProtocol SW8468260DVolatile Organic Compounds by GC/MS EET DEN SW8468260D SIM Volatile Organic Compounds (GC/MS)EET DEN SW8465030BPurge and Trap EET DEN Protocol References: SW846 = "Test Methods For Evaluating Solid Waste, Physical/Chemical Methods", Third Edition, November 1986 And Its Updates. Laboratory References: EET DEN = Eurofins Denver, 4955 Yarrow Street, Arvada, CO 80002, TEL (303)736-0100 Eurofins Denver Page 8 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Sample Summary Client: Geosyntec Consultants Inc Job ID: 280-183916-1 Project/Site: Ashland Former Bacchus Plant 3 Utah Lab Sample ID Client Sample ID Matrix Collected Received 280-183916-1 HIMW1-GW-1023 Water 10/30/23 12:05 11/01/23 09:45 280-183916-2 HIMW2-GW-1023 Water 10/30/23 15:10 11/01/23 09:45 280-183916-3 HIMW3-GW-1023 Water 10/30/23 13:05 11/01/23 09:45 280-183916-4 HIMW5-GW-1023 Water 10/30/23 14:10 11/01/23 09:45 280-183916-5 TRIP BLANK 1023 Water 10/30/23 00:00 11/01/23 09:45 280-183916-6 HIMW11-GW-1023 Water 10/30/23 12:40 11/01/23 09:45 Eurofins Denver Page 9 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Client Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: SW846 8260D SIM - Volatile Organic Compounds (GC/MS) Lab Sample ID: 280-183916-1Client Sample ID: HIMW1-GW-1023 Matrix: WaterDate Collected: 10/30/23 12:05 Date Received: 11/01/23 09:45 RL MDL 1.4 U 1.4 0.24 ug/L 11/09/23 16:13 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier 1,4-Dioxane 1,2-Dichloroethane-d4 (Surr)106 70 -127 11/09/23 16:13 1 Surrogate Dil FacAnalyzedPreparedQualifierLimits%Recovery Lab Sample ID: 280-183916-2Client Sample ID: HIMW2-GW-1023 Matrix: WaterDate Collected: 10/30/23 15:10 Date Received: 11/01/23 09:45 RL MDL 3.7 1.4 0.24 ug/L 11/09/23 16:34 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier 1,4-Dioxane 1,2-Dichloroethane-d4 (Surr)101 70 -127 11/09/23 16:34 1 Surrogate Dil FacAnalyzedPreparedQualifierLimits%Recovery Lab Sample ID: 280-183916-3Client Sample ID: HIMW3-GW-1023 Matrix: WaterDate Collected: 10/30/23 13:05 Date Received: 11/01/23 09:45 RL MDL 4.2 1.4 0.24 ug/L 11/09/23 16:55 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier 1,4-Dioxane 1,2-Dichloroethane-d4 (Surr)100 70 -127 11/09/23 16:55 1 Surrogate Dil FacAnalyzedPreparedQualifierLimits%Recovery Lab Sample ID: 280-183916-4Client Sample ID: HIMW5-GW-1023 Matrix: WaterDate Collected: 10/30/23 14:10 Date Received: 11/01/23 09:45 RL MDL 13 1.4 0.24 ug/L 11/09/23 17:16 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier 1,4-Dioxane 1,2-Dichloroethane-d4 (Surr)101 70 -127 11/09/23 17:16 1 Surrogate Dil FacAnalyzedPreparedQualifierLimits%Recovery Lab Sample ID: 280-183916-5Client Sample ID: TRIP BLANK 1023 Matrix: WaterDate Collected: 10/30/23 00:00 Date Received: 11/01/23 09:45 RL MDL 1.4 U 1.4 0.24 ug/L 11/09/23 14:09 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier 1,4-Dioxane 1,2-Dichloroethane-d4 (Surr)104 70 -127 11/09/23 14:09 1 Surrogate Dil FacAnalyzedPreparedQualifierLimits%Recovery Lab Sample ID: 280-183916-6Client Sample ID: HIMW11-GW-1023 Matrix: WaterDate Collected: 10/30/23 12:40 Date Received: 11/01/23 09:45 RL MDL 1.4 U 1.4 0.24 ug/L 11/09/23 17:36 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier 1,4-Dioxane 1,2-Dichloroethane-d4 (Surr)104 70 -127 11/09/23 17:36 1 Surrogate Dil FacAnalyzedPreparedQualifierLimits%Recovery Eurofins Denver Page 10 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Client Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: SW846 8260D - Volatile Organic Compounds by GC/MS Lab Sample ID: 280-183916-1Client Sample ID: HIMW1-GW-1023 Matrix: WaterDate Collected: 10/30/23 12:05 Date Received: 11/01/23 09:45 RL MDL 1.0 U 1.0 0.58 ug/L 11/11/23 01:05 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier 1,1,1,2-Tetrachloroethane 1.0 0.39 ug/L 11/11/23 01:05 11.0 U1,1,1-Trichloroethane 1.0 0.21 ug/L 11/11/23 01:05 11.0 U1,1,2,2-Tetrachloroethane 1.0 0.27 ug/L 11/11/23 01:05 11.0 U1,1,2-Trichloroethane 1.0 0.22 ug/L 11/11/23 01:05 11.0 U1,1-Dichloroethane 1.0 0.23 ug/L 11/11/23 01:05 11.0 U1,1-Dichloroethene 1.0 0.42 ug/L 11/11/23 01:05 11.0 U1,1-Dichloropropene 2.0 0.70 ug/L 11/11/23 01:05 12.0 U1,2,3-Trichlorobenzene 2.5 0.86 ug/L 11/11/23 01:05 12.5 U1,2,3-Trichloropropane 1.0 0.58 ug/L 11/11/23 01:05 11.0 U1,2,4-Trichlorobenzene 1.0 0.15 ug/L 11/11/23 01:05 11.0 U1,2,4-Trimethylbenzene 5.0 1.8 ug/L 11/11/23 01:05 15.0 U1,2-Dibromo-3-Chloropropane 1.0 0.40 ug/L 11/11/23 01:05 11.0 U1,2-Dibromoethane (EDB) 1.0 0.37 ug/L 11/11/23 01:05 11.0 U1,2-Dichlorobenzene 1.0 0.54 ug/L 11/11/23 01:05 11.0 U1,2-Dichloroethane 1.0 0.52 ug/L 11/11/23 01:05 11.0 U1,2-Dichloropropane 1.0 0.37 ug/L 11/11/23 01:05 11.0 U1,3,5-Trimethylbenzene 1.0 0.33 ug/L 11/11/23 01:05 11.0 U1,3-Dichlorobenzene 1.0 0.38 ug/L 11/11/23 01:05 11.0 U1,3-Dichloropropane 1.0 0.39 ug/L 11/11/23 01:05 11.0 U1,4-Dichlorobenzene 1.0 0.38 ug/L 11/11/23 01:05 11.0 U2,2-Dichloropropane 15 6.0 ug/L 11/11/23 01:05 115U2-Butanone (MEK) 1.0 0.34 ug/L 11/11/23 01:05 11.0 U2-Chlorotoluene 5.0 1.7 ug/L 11/11/23 01:05 15.0 U2-Hexanone 1.0 0.21 ug/L 11/11/23 01:05 11.0 U4-Chlorotoluene 1.0 0.43 ug/L 11/11/23 01:05 11.0 U4-Isopropyltoluene 5.0 0.98 ug/L 11/11/23 01:05 15.0 U4-Methyl-2-pentanone (MIBK) 15 6.6 ug/L 11/11/23 01:05 115UAcetone 1.0 0.31 ug/L 11/11/23 01:05 11.0 UBenzene 1.0 0.40 ug/L 11/11/23 01:05 11.0 UBromobenzene 1.0 0.40 ug/L 11/11/23 01:05 11.0 UBromochloromethane 2.0 1.2 ug/L 11/11/23 01:05 12.0 UBromoform 5.0 2.4 ug/L 11/11/23 01:05 15.0 UBromomethane 1.0 0.57 ug/L 11/11/23 01:05 11.0 UCarbon tetrachloride 1.0 0.42 ug/L 11/11/23 01:05 11.0 UChlorobenzene 4.0 1.4 ug/L 11/11/23 01:05 14.0 UChloroethane 1.0 0.36 ug/L 11/11/23 01:05 11.0 UChloroform 2.0 0.75 ug/L 11/11/23 01:05 12.0 UChloromethane 1.0 0.32 ug/L 11/11/23 01:05 11.0 Ucis-1,2-Dichloroethene 2.0 0.63 ug/L 11/11/23 01:05 12.0 Ucis-1,3-Dichloropropene 2.0 0.62 ug/L 11/11/23 01:05 12.0 UDibromochloromethane 1.0 0.34 ug/L 11/11/23 01:05 11.0 UDibromomethane 1.0 0.39 ug/L 11/11/23 01:05 11.0 UDichlorobromomethane 3.0 0.96 ug/L 11/11/23 01:05 13.0 UDichlorodifluoromethane 1.0 0.30 ug/L 11/11/23 01:05 11.0 UEthylbenzene 2.0 1.2 ug/L 11/11/23 01:05 12.0 UHexachlorobutadiene 1.0 0.36 ug/L 11/11/23 01:05 11.0 UIsopropylbenzene 5.0 0.25 ug/L 11/11/23 01:05 15.0 UMethyl tert-butyl ether 2.0 0.94 ug/L 11/11/23 01:05 12.0 UMethylene Chloride Eurofins Denver Page 11 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Client Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: SW846 8260D - Volatile Organic Compounds by GC/MS (Continued) Lab Sample ID: 280-183916-1Client Sample ID: HIMW1-GW-1023 Matrix: WaterDate Collected: 10/30/23 12:05 Date Received: 11/01/23 09:45 RL MDL 2.0 U 2.0 0.36 ug/L 11/11/23 01:05 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier m-Xylene & p-Xylene 2.0 0.63 ug/L 11/11/23 01:05 12.0 UNaphthalene 1.0 0.48 ug/L 11/11/23 01:05 11.0 Un-Butylbenzene 1.0 0.53 ug/L 11/11/23 01:05 11.0 UN-Propylbenzene 1.0 0.33 ug/L 11/11/23 01:05 11.0 Uo-Xylene 1.0 0.45 ug/L 11/11/23 01:05 11.0 Usec-Butylbenzene 1.0 0.36 ug/L 11/11/23 01:05 11.0 UStyrene 1.0 0.42 ug/L 11/11/23 01:05 11.0 Utert-Butylbenzene 1.0 0.40 ug/L 11/11/23 01:05 11.0 UTetrachloroethene 1.0 0.32 ug/L 11/11/23 01:05 11.0 UToluene 1.0 0.37 ug/L 11/11/23 01:05 11.0 Utrans-1,2-Dichloroethene 2.0 0.65 ug/L 11/11/23 01:05 12.0 Utrans-1,3-Dichloropropene 1.0 0.30 ug/L 11/11/23 01:05 11.0 UTrichloroethene 2.0 0.57 ug/L 11/11/23 01:05 12.0 UTrichlorofluoromethane 2.0 0.51 ug/L 11/11/23 01:05 12.0 UVinyl chloride 1.0 0.33 ug/L 11/11/23 01:05 11.0 UXylenes, Total 1,2-Dichloroethane-d4 (Surr)101 70 -127 11/11/23 01:05 1 Surrogate Dil FacAnalyzedPreparedQualifierLimits%Recovery 4-Bromofluorobenzene (Surr)100 11/11/23 01:05 178-120 Dibromofluoromethane (Surr)100 11/11/23 01:05 177-120 Toluene-d8 (Surr)99 11/11/23 01:05 180-125 Lab Sample ID: 280-183916-2Client Sample ID: HIMW2-GW-1023 Matrix: WaterDate Collected: 10/30/23 15:10 Date Received: 11/01/23 09:45 RL MDL 1.0 U 1.0 0.58 ug/L 11/11/23 01:26 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier 1,1,1,2-Tetrachloroethane 1.0 0.39 ug/L 11/11/23 01:26 11.0 U1,1,1-Trichloroethane 1.0 0.21 ug/L 11/11/23 01:26 11.0 U1,1,2,2-Tetrachloroethane 1.0 0.27 ug/L 11/11/23 01:26 11.51,1,2-Trichloroethane 1.0 0.22 ug/L 11/11/23 01:26 11.0 U1,1-Dichloroethane 1.0 0.23 ug/L 11/11/23 01:26 14.01,1-Dichloroethene 1.0 0.42 ug/L 11/11/23 01:26 11.0 U1,1-Dichloropropene 2.0 0.70 ug/L 11/11/23 01:26 12.0 U1,2,3-Trichlorobenzene 2.5 0.86 ug/L 11/11/23 01:26 12.5 U1,2,3-Trichloropropane 1.0 0.58 ug/L 11/11/23 01:26 11.0 U1,2,4-Trichlorobenzene 1.0 0.15 ug/L 11/11/23 01:26 11.0 U1,2,4-Trimethylbenzene 5.0 1.8 ug/L 11/11/23 01:26 15.0 U1,2-Dibromo-3-Chloropropane 1.0 0.40 ug/L 11/11/23 01:26 11.0 U1,2-Dibromoethane (EDB) 1.0 0.37 ug/L 11/11/23 01:26 11.0 U1,2-Dichlorobenzene 1.0 0.54 ug/L 11/11/23 01:26 16.51,2-Dichloroethane 1.0 0.52 ug/L 11/11/23 01:26 11.0 U1,2-Dichloropropane 1.0 0.37 ug/L 11/11/23 01:26 11.0 U1,3,5-Trimethylbenzene 1.0 0.33 ug/L 11/11/23 01:26 11.0 U1,3-Dichlorobenzene 1.0 0.38 ug/L 11/11/23 01:26 11.0 U1,3-Dichloropropane 1.0 0.39 ug/L 11/11/23 01:26 11.0 U1,4-Dichlorobenzene 1.0 0.38 ug/L 11/11/23 01:26 11.0 U2,2-Dichloropropane 15 6.0 ug/L 11/11/23 01:26 115U2-Butanone (MEK) 1.0 0.34 ug/L 11/11/23 01:26 11.0 U2-Chlorotoluene Eurofins Denver Page 12 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Client Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: SW846 8260D - Volatile Organic Compounds by GC/MS (Continued) Lab Sample ID: 280-183916-2Client Sample ID: HIMW2-GW-1023 Matrix: WaterDate Collected: 10/30/23 15:10 Date Received: 11/01/23 09:45 RL MDL 5.0 U 5.0 1.7 ug/L 11/11/23 01:26 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier 2-Hexanone 1.0 0.21 ug/L 11/11/23 01:26 11.0 U4-Chlorotoluene 1.0 0.43 ug/L 11/11/23 01:26 11.0 U4-Isopropyltoluene 5.0 0.98 ug/L 11/11/23 01:26 15.0 U4-Methyl-2-pentanone (MIBK) 15 6.6 ug/L 11/11/23 01:26 115UAcetone 1.0 0.31 ug/L 11/11/23 01:26 11.0 UBenzene 1.0 0.40 ug/L 11/11/23 01:26 11.0 UBromobenzene 1.0 0.40 ug/L 11/11/23 01:26 11.0 UBromochloromethane 2.0 1.2 ug/L 11/11/23 01:26 12.0 UBromoform 5.0 2.4 ug/L 11/11/23 01:26 15.0 UBromomethane 1.0 0.57 ug/L 11/11/23 01:26 11.0 UCarbon tetrachloride 1.0 0.42 ug/L 11/11/23 01:26 11.0 UChlorobenzene 4.0 1.4 ug/L 11/11/23 01:26 14.0 UChloroethane 1.0 0.36 ug/L 11/11/23 01:26 10.69 JChloroform 2.0 0.75 ug/L 11/11/23 01:26 12.0 U F2Chloromethane 1.0 0.32 ug/L 11/11/23 01:26 11.0 Ucis-1,2-Dichloroethene 2.0 0.63 ug/L 11/11/23 01:26 12.0 Ucis-1,3-Dichloropropene 2.0 0.62 ug/L 11/11/23 01:26 12.0 UDibromochloromethane 1.0 0.34 ug/L 11/11/23 01:26 11.0 UDibromomethane 1.0 0.39 ug/L 11/11/23 01:26 11.0 UDichlorobromomethane 3.0 0.96 ug/L 11/11/23 01:26 13.0 UDichlorodifluoromethane 1.0 0.30 ug/L 11/11/23 01:26 11.0 UEthylbenzene 2.0 1.2 ug/L 11/11/23 01:26 12.0 UHexachlorobutadiene 1.0 0.36 ug/L 11/11/23 01:26 11.0 UIsopropylbenzene 5.0 0.25 ug/L 11/11/23 01:26 15.0 UMethyl tert-butyl ether 2.0 0.94 ug/L 11/11/23 01:26 12.0 UMethylene Chloride 2.0 0.36 ug/L 11/11/23 01:26 12.0 Um-Xylene & p-Xylene 2.0 0.63 ug/L 11/11/23 01:26 12.0 UNaphthalene 1.0 0.48 ug/L 11/11/23 01:26 11.0 Un-Butylbenzene 1.0 0.53 ug/L 11/11/23 01:26 11.0 UN-Propylbenzene 1.0 0.33 ug/L 11/11/23 01:26 11.0 Uo-Xylene 1.0 0.45 ug/L 11/11/23 01:26 11.0 Usec-Butylbenzene 1.0 0.36 ug/L 11/11/23 01:26 11.0 UStyrene 1.0 0.42 ug/L 11/11/23 01:26 11.0 Utert-Butylbenzene 1.0 0.40 ug/L 11/11/23 01:26 11.0 UTetrachloroethene 1.0 0.32 ug/L 11/11/23 01:26 11.0 UToluene 1.0 0.37 ug/L 11/11/23 01:26 11.0 Utrans-1,2-Dichloroethene 2.0 0.65 ug/L 11/11/23 01:26 12.0 Utrans-1,3-Dichloropropene 1.0 0.30 ug/L 11/11/23 01:26 185F1Trichloroethene 2.0 0.57 ug/L 11/11/23 01:26 12.0 UTrichlorofluoromethane 2.0 0.51 ug/L 11/11/23 01:26 12.0 UVinyl chloride 1.0 0.33 ug/L 11/11/23 01:26 11.0 UXylenes, Total 1,2-Dichloroethane-d4 (Surr)100 70 -127 11/11/23 01:26 1 Surrogate Dil FacAnalyzedPreparedQualifierLimits%Recovery 4-Bromofluorobenzene (Surr)100 11/11/23 01:26 178-120 Dibromofluoromethane (Surr)99 11/11/23 01:26 177-120 Toluene-d8 (Surr)100 11/11/23 01:26 180-125 Eurofins Denver Page 13 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Client Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: SW846 8260D - Volatile Organic Compounds by GC/MS Lab Sample ID: 280-183916-3Client Sample ID: HIMW3-GW-1023 Matrix: WaterDate Collected: 10/30/23 13:05 Date Received: 11/01/23 09:45 RL MDL 1.0 U 1.0 0.58 ug/L 11/11/23 01:47 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier 1,1,1,2-Tetrachloroethane 1.0 0.39 ug/L 11/11/23 01:47 1181,1,1-Trichloroethane 1.0 0.21 ug/L 11/11/23 01:47 11.0 U1,1,2,2-Tetrachloroethane 1.0 0.27 ug/L 11/11/23 01:47 11.0 U1,1,2-Trichloroethane 1.0 0.22 ug/L 11/11/23 01:47 11.0 U1,1-Dichloroethane 1.0 0.23 ug/L 11/11/23 01:47 11401,1-Dichloroethene 1.0 0.42 ug/L 11/11/23 01:47 11.0 U1,1-Dichloropropene 2.0 0.70 ug/L 11/11/23 01:47 12.0 U1,2,3-Trichlorobenzene 2.5 0.86 ug/L 11/11/23 01:47 12.5 U1,2,3-Trichloropropane 1.0 0.58 ug/L 11/11/23 01:47 11.0 U1,2,4-Trichlorobenzene 1.0 0.15 ug/L 11/11/23 01:47 11.0 U1,2,4-Trimethylbenzene 5.0 1.8 ug/L 11/11/23 01:47 15.0 U1,2-Dibromo-3-Chloropropane 1.0 0.40 ug/L 11/11/23 01:47 11.0 U1,2-Dibromoethane (EDB) 1.0 0.37 ug/L 11/11/23 01:47 11.0 U1,2-Dichlorobenzene 1.0 0.54 ug/L 11/11/23 01:47 11.0 U1,2-Dichloroethane 1.0 0.52 ug/L 11/11/23 01:47 11.0 U1,2-Dichloropropane 1.0 0.37 ug/L 11/11/23 01:47 11.0 U1,3,5-Trimethylbenzene 1.0 0.33 ug/L 11/11/23 01:47 11.0 U1,3-Dichlorobenzene 1.0 0.38 ug/L 11/11/23 01:47 11.0 U1,3-Dichloropropane 1.0 0.39 ug/L 11/11/23 01:47 11.0 U1,4-Dichlorobenzene 1.0 0.38 ug/L 11/11/23 01:47 11.0 U2,2-Dichloropropane 15 6.0 ug/L 11/11/23 01:47 115U2-Butanone (MEK) 1.0 0.34 ug/L 11/11/23 01:47 11.0 U2-Chlorotoluene 5.0 1.7 ug/L 11/11/23 01:47 15.0 U2-Hexanone 1.0 0.21 ug/L 11/11/23 01:47 11.0 U4-Chlorotoluene 1.0 0.43 ug/L 11/11/23 01:47 11.0 U4-Isopropyltoluene 5.0 0.98 ug/L 11/11/23 01:47 15.0 U4-Methyl-2-pentanone (MIBK) 15 6.6 ug/L 11/11/23 01:47 115UAcetone 1.0 0.31 ug/L 11/11/23 01:47 11.0 UBenzene 1.0 0.40 ug/L 11/11/23 01:47 11.0 UBromobenzene 1.0 0.40 ug/L 11/11/23 01:47 11.0 UBromochloromethane 2.0 1.2 ug/L 11/11/23 01:47 12.0 UBromoform 5.0 2.4 ug/L 11/11/23 01:47 15.0 UBromomethane 1.0 0.57 ug/L 11/11/23 01:47 11.0 UCarbon tetrachloride 1.0 0.42 ug/L 11/11/23 01:47 11.0 UChlorobenzene 4.0 1.4 ug/L 11/11/23 01:47 14.0 UChloroethane 1.0 0.36 ug/L 11/11/23 01:47 11.0 UChloroform 2.0 0.75 ug/L 11/11/23 01:47 12.0 UChloromethane 1.0 0.32 ug/L 11/11/23 01:47 11.0 Ucis-1,2-Dichloroethene 2.0 0.63 ug/L 11/11/23 01:47 12.0 Ucis-1,3-Dichloropropene 2.0 0.62 ug/L 11/11/23 01:47 12.0 UDibromochloromethane 1.0 0.34 ug/L 11/11/23 01:47 11.0 UDibromomethane 1.0 0.39 ug/L 11/11/23 01:47 11.0 UDichlorobromomethane 3.0 0.96 ug/L 11/11/23 01:47 13.0 UDichlorodifluoromethane 1.0 0.30 ug/L 11/11/23 01:47 11.0 UEthylbenzene 2.0 1.2 ug/L 11/11/23 01:47 12.0 UHexachlorobutadiene 1.0 0.36 ug/L 11/11/23 01:47 11.0 UIsopropylbenzene 5.0 0.25 ug/L 11/11/23 01:47 15.0 UMethyl tert-butyl ether 2.0 0.94 ug/L 11/11/23 01:47 12.0 UMethylene Chloride Eurofins Denver Page 14 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Client Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: SW846 8260D - Volatile Organic Compounds by GC/MS (Continued) Lab Sample ID: 280-183916-3Client Sample ID: HIMW3-GW-1023 Matrix: WaterDate Collected: 10/30/23 13:05 Date Received: 11/01/23 09:45 RL MDL 2.0 U 2.0 0.36 ug/L 11/11/23 01:47 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier m-Xylene & p-Xylene 2.0 0.63 ug/L 11/11/23 01:47 12.0 UNaphthalene 1.0 0.48 ug/L 11/11/23 01:47 11.0 Un-Butylbenzene 1.0 0.53 ug/L 11/11/23 01:47 11.0 UN-Propylbenzene 1.0 0.33 ug/L 11/11/23 01:47 11.0 Uo-Xylene 1.0 0.45 ug/L 11/11/23 01:47 11.0 Usec-Butylbenzene 1.0 0.36 ug/L 11/11/23 01:47 11.0 UStyrene 1.0 0.42 ug/L 11/11/23 01:47 11.0 Utert-Butylbenzene 1.0 0.40 ug/L 11/11/23 01:47 11.0 UTetrachloroethene 1.0 0.32 ug/L 11/11/23 01:47 11.0 UToluene 1.0 0.37 ug/L 11/11/23 01:47 11.0 Utrans-1,2-Dichloroethene 2.0 0.65 ug/L 11/11/23 01:47 12.0 Utrans-1,3-Dichloropropene 1.0 0.30 ug/L 11/11/23 01:47 11.0 UTrichloroethene 2.0 0.57 ug/L 11/11/23 01:47 12.0 UTrichlorofluoromethane 2.0 0.51 ug/L 11/11/23 01:47 12.0 UVinyl chloride 1.0 0.33 ug/L 11/11/23 01:47 11.0 UXylenes, Total 1,2-Dichloroethane-d4 (Surr)100 70 -127 11/11/23 01:47 1 Surrogate Dil FacAnalyzedPreparedQualifierLimits%Recovery 4-Bromofluorobenzene (Surr)100 11/11/23 01:47 178-120 Dibromofluoromethane (Surr)98 11/11/23 01:47 177-120 Toluene-d8 (Surr)99 11/11/23 01:47 180-125 Lab Sample ID: 280-183916-4Client Sample ID: HIMW5-GW-1023 Matrix: WaterDate Collected: 10/30/23 14:10 Date Received: 11/01/23 09:45 RL MDL 1.0 U 1.0 0.58 ug/L 11/11/23 02:08 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier 1,1,1,2-Tetrachloroethane 1.0 0.39 ug/L 11/11/23 02:08 11.31,1,1-Trichloroethane 1.0 0.21 ug/L 11/11/23 02:08 11.0 U1,1,2,2-Tetrachloroethane 1.0 0.27 ug/L 11/11/23 02:08 11.0 U1,1,2-Trichloroethane 1.0 0.22 ug/L 11/11/23 02:08 11.0 U1,1-Dichloroethane 1.0 0.23 ug/L 11/11/23 02:08 1181,1-Dichloroethene 1.0 0.42 ug/L 11/11/23 02:08 11.0 U1,1-Dichloropropene 2.0 0.70 ug/L 11/11/23 02:08 12.0 U1,2,3-Trichlorobenzene 2.5 0.86 ug/L 11/11/23 02:08 12.5 U1,2,3-Trichloropropane 1.0 0.58 ug/L 11/11/23 02:08 11.0 U1,2,4-Trichlorobenzene 1.0 0.15 ug/L 11/11/23 02:08 11.0 U1,2,4-Trimethylbenzene 5.0 1.8 ug/L 11/11/23 02:08 15.0 U1,2-Dibromo-3-Chloropropane 1.0 0.40 ug/L 11/11/23 02:08 11.0 U1,2-Dibromoethane (EDB) 1.0 0.37 ug/L 11/11/23 02:08 11.0 U1,2-Dichlorobenzene 1.0 0.54 ug/L 11/11/23 02:08 11.0 U1,2-Dichloroethane 1.0 0.52 ug/L 11/11/23 02:08 11.0 U1,2-Dichloropropane 1.0 0.37 ug/L 11/11/23 02:08 11.0 U1,3,5-Trimethylbenzene 1.0 0.33 ug/L 11/11/23 02:08 11.0 U1,3-Dichlorobenzene 1.0 0.38 ug/L 11/11/23 02:08 11.0 U1,3-Dichloropropane 1.0 0.39 ug/L 11/11/23 02:08 11.0 U1,4-Dichlorobenzene 1.0 0.38 ug/L 11/11/23 02:08 11.0 U2,2-Dichloropropane 15 6.0 ug/L 11/11/23 02:08 115U2-Butanone (MEK) 1.0 0.34 ug/L 11/11/23 02:08 11.0 U2-Chlorotoluene Eurofins Denver Page 15 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Client Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: SW846 8260D - Volatile Organic Compounds by GC/MS (Continued) Lab Sample ID: 280-183916-4Client Sample ID: HIMW5-GW-1023 Matrix: WaterDate Collected: 10/30/23 14:10 Date Received: 11/01/23 09:45 RL MDL 5.0 U 5.0 1.7 ug/L 11/11/23 02:08 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier 2-Hexanone 1.0 0.21 ug/L 11/11/23 02:08 11.0 U4-Chlorotoluene 1.0 0.43 ug/L 11/11/23 02:08 11.0 U4-Isopropyltoluene 5.0 0.98 ug/L 11/11/23 02:08 15.0 U4-Methyl-2-pentanone (MIBK) 15 6.6 ug/L 11/11/23 02:08 115UAcetone 1.0 0.31 ug/L 11/11/23 02:08 11.0 UBenzene 1.0 0.40 ug/L 11/11/23 02:08 11.0 UBromobenzene 1.0 0.40 ug/L 11/11/23 02:08 11.0 UBromochloromethane 2.0 1.2 ug/L 11/11/23 02:08 12.0 UBromoform 5.0 2.4 ug/L 11/11/23 02:08 15.0 UBromomethane 1.0 0.57 ug/L 11/11/23 02:08 11.0 UCarbon tetrachloride 1.0 0.42 ug/L 11/11/23 02:08 11.0 UChlorobenzene 4.0 1.4 ug/L 11/11/23 02:08 14.0 UChloroethane 1.0 0.36 ug/L 11/11/23 02:08 12.2Chloroform 2.0 0.75 ug/L 11/11/23 02:08 12.0 UChloromethane 1.0 0.32 ug/L 11/11/23 02:08 11.0 Ucis-1,2-Dichloroethene 2.0 0.63 ug/L 11/11/23 02:08 12.0 Ucis-1,3-Dichloropropene 2.0 0.62 ug/L 11/11/23 02:08 12.0 UDibromochloromethane 1.0 0.34 ug/L 11/11/23 02:08 11.0 UDibromomethane 1.0 0.39 ug/L 11/11/23 02:08 11.0 UDichlorobromomethane 3.0 0.96 ug/L 11/11/23 02:08 13.0 UDichlorodifluoromethane 1.0 0.30 ug/L 11/11/23 02:08 11.0 UEthylbenzene 2.0 1.2 ug/L 11/11/23 02:08 12.0 UHexachlorobutadiene 1.0 0.36 ug/L 11/11/23 02:08 11.0 UIsopropylbenzene 5.0 0.25 ug/L 11/11/23 02:08 15.0 UMethyl tert-butyl ether 2.0 0.94 ug/L 11/11/23 02:08 12.0 UMethylene Chloride 2.0 0.36 ug/L 11/11/23 02:08 12.0 Um-Xylene & p-Xylene 2.0 0.63 ug/L 11/11/23 02:08 12.0 UNaphthalene 1.0 0.48 ug/L 11/11/23 02:08 11.0 Un-Butylbenzene 1.0 0.53 ug/L 11/11/23 02:08 11.0 UN-Propylbenzene 1.0 0.33 ug/L 11/11/23 02:08 11.0 Uo-Xylene 1.0 0.45 ug/L 11/11/23 02:08 11.0 Usec-Butylbenzene 1.0 0.36 ug/L 11/11/23 02:08 11.0 UStyrene 1.0 0.42 ug/L 11/11/23 02:08 11.0 Utert-Butylbenzene 1.0 0.40 ug/L 11/11/23 02:08 11.0 UTetrachloroethene 1.0 0.32 ug/L 11/11/23 02:08 11.0 UToluene 1.0 0.37 ug/L 11/11/23 02:08 11.0 Utrans-1,2-Dichloroethene 2.0 0.65 ug/L 11/11/23 02:08 12.0 Utrans-1,3-Dichloropropene 1.0 0.30 ug/L 11/11/23 02:08 11.0 UTrichloroethene 2.0 0.57 ug/L 11/11/23 02:08 12.0 UTrichlorofluoromethane 2.0 0.51 ug/L 11/11/23 02:08 12.0 UVinyl chloride 1.0 0.33 ug/L 11/11/23 02:08 11.0 UXylenes, Total 1,2-Dichloroethane-d4 (Surr)102 70 -127 11/11/23 02:08 1 Surrogate Dil FacAnalyzedPreparedQualifierLimits%Recovery 4-Bromofluorobenzene (Surr)99 11/11/23 02:08 178-120 Dibromofluoromethane (Surr)100 11/11/23 02:08 177-120 Toluene-d8 (Surr)99 11/11/23 02:08 180-125 Eurofins Denver Page 16 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Client Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: SW846 8260D - Volatile Organic Compounds by GC/MS Lab Sample ID: 280-183916-5Client Sample ID: TRIP BLANK 1023 Matrix: WaterDate Collected: 10/30/23 00:00 Date Received: 11/01/23 09:45 RL MDL 1.0 U 1.0 0.58 ug/L 11/10/23 21:32 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier 1,1,1,2-Tetrachloroethane 1.0 0.39 ug/L 11/10/23 21:32 11.0 U1,1,1-Trichloroethane 1.0 0.21 ug/L 11/10/23 21:32 11.0 U1,1,2,2-Tetrachloroethane 1.0 0.27 ug/L 11/10/23 21:32 11.0 U1,1,2-Trichloroethane 1.0 0.22 ug/L 11/10/23 21:32 11.0 U1,1-Dichloroethane 1.0 0.23 ug/L 11/10/23 21:32 11.0 U1,1-Dichloroethene 1.0 0.42 ug/L 11/10/23 21:32 11.0 U1,1-Dichloropropene 2.0 0.70 ug/L 11/10/23 21:32 12.0 U1,2,3-Trichlorobenzene 2.5 0.86 ug/L 11/10/23 21:32 12.5 U1,2,3-Trichloropropane 1.0 0.58 ug/L 11/10/23 21:32 11.0 U1,2,4-Trichlorobenzene 1.0 0.15 ug/L 11/10/23 21:32 11.0 U1,2,4-Trimethylbenzene 5.0 1.8 ug/L 11/10/23 21:32 15.0 U1,2-Dibromo-3-Chloropropane 1.0 0.40 ug/L 11/10/23 21:32 11.0 U1,2-Dibromoethane (EDB) 1.0 0.37 ug/L 11/10/23 21:32 11.0 U1,2-Dichlorobenzene 1.0 0.54 ug/L 11/10/23 21:32 11.0 U1,2-Dichloroethane 1.0 0.52 ug/L 11/10/23 21:32 11.0 U1,2-Dichloropropane 1.0 0.37 ug/L 11/10/23 21:32 11.0 U1,3,5-Trimethylbenzene 1.0 0.33 ug/L 11/10/23 21:32 11.0 U1,3-Dichlorobenzene 1.0 0.38 ug/L 11/10/23 21:32 11.0 U1,3-Dichloropropane 1.0 0.39 ug/L 11/10/23 21:32 11.0 U1,4-Dichlorobenzene 1.0 0.38 ug/L 11/10/23 21:32 11.0 U2,2-Dichloropropane 15 6.0 ug/L 11/10/23 21:32 115U2-Butanone (MEK) 1.0 0.34 ug/L 11/10/23 21:32 11.0 U2-Chlorotoluene 5.0 1.7 ug/L 11/10/23 21:32 15.0 U2-Hexanone 1.0 0.21 ug/L 11/10/23 21:32 11.0 U4-Chlorotoluene 1.0 0.43 ug/L 11/10/23 21:32 11.0 U4-Isopropyltoluene 5.0 0.98 ug/L 11/10/23 21:32 15.0 U4-Methyl-2-pentanone (MIBK) 15 6.6 ug/L 11/10/23 21:32 115UAcetone 1.0 0.31 ug/L 11/10/23 21:32 11.0 UBenzene 1.0 0.40 ug/L 11/10/23 21:32 11.0 UBromobenzene 1.0 0.40 ug/L 11/10/23 21:32 11.0 UBromochloromethane 2.0 1.2 ug/L 11/10/23 21:32 12.0 UBromoform 5.0 2.4 ug/L 11/10/23 21:32 15.0 UBromomethane 1.0 0.57 ug/L 11/10/23 21:32 11.0 UCarbon tetrachloride 1.0 0.42 ug/L 11/10/23 21:32 11.0 UChlorobenzene 4.0 1.4 ug/L 11/10/23 21:32 14.0 UChloroethane 1.0 0.36 ug/L 11/10/23 21:32 11.0 UChloroform 2.0 0.75 ug/L 11/10/23 21:32 12.0 UChloromethane 1.0 0.32 ug/L 11/10/23 21:32 11.0 Ucis-1,2-Dichloroethene 2.0 0.63 ug/L 11/10/23 21:32 12.0 Ucis-1,3-Dichloropropene 2.0 0.62 ug/L 11/10/23 21:32 12.0 UDibromochloromethane 1.0 0.34 ug/L 11/10/23 21:32 11.0 UDibromomethane 1.0 0.39 ug/L 11/10/23 21:32 11.0 UDichlorobromomethane 3.0 0.96 ug/L 11/10/23 21:32 13.0 UDichlorodifluoromethane 1.0 0.30 ug/L 11/10/23 21:32 11.0 UEthylbenzene 2.0 1.2 ug/L 11/10/23 21:32 12.0 UHexachlorobutadiene 1.0 0.36 ug/L 11/10/23 21:32 11.0 UIsopropylbenzene 5.0 0.25 ug/L 11/10/23 21:32 15.0 UMethyl tert-butyl ether 2.0 0.94 ug/L 11/10/23 21:32 12.0 UMethylene Chloride Eurofins Denver Page 17 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Client Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: SW846 8260D - Volatile Organic Compounds by GC/MS (Continued) Lab Sample ID: 280-183916-5Client Sample ID: TRIP BLANK 1023 Matrix: WaterDate Collected: 10/30/23 00:00 Date Received: 11/01/23 09:45 RL MDL 2.0 U 2.0 0.36 ug/L 11/10/23 21:32 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier m-Xylene & p-Xylene 2.0 0.63 ug/L 11/10/23 21:32 12.0 UNaphthalene 1.0 0.48 ug/L 11/10/23 21:32 11.0 Un-Butylbenzene 1.0 0.53 ug/L 11/10/23 21:32 11.0 UN-Propylbenzene 1.0 0.33 ug/L 11/10/23 21:32 11.0 Uo-Xylene 1.0 0.45 ug/L 11/10/23 21:32 11.0 Usec-Butylbenzene 1.0 0.36 ug/L 11/10/23 21:32 11.0 UStyrene 1.0 0.42 ug/L 11/10/23 21:32 11.0 Utert-Butylbenzene 1.0 0.40 ug/L 11/10/23 21:32 11.0 UTetrachloroethene 1.0 0.32 ug/L 11/10/23 21:32 11.0 UToluene 1.0 0.37 ug/L 11/10/23 21:32 11.0 Utrans-1,2-Dichloroethene 2.0 0.65 ug/L 11/10/23 21:32 12.0 Utrans-1,3-Dichloropropene 1.0 0.30 ug/L 11/10/23 21:32 11.0 UTrichloroethene 2.0 0.57 ug/L 11/10/23 21:32 12.0 UTrichlorofluoromethane 2.0 0.51 ug/L 11/10/23 21:32 12.0 UVinyl chloride 1.0 0.33 ug/L 11/10/23 21:32 11.0 UXylenes, Total 1,2-Dichloroethane-d4 (Surr)102 70 -127 11/10/23 21:32 1 Surrogate Dil FacAnalyzedPreparedQualifierLimits%Recovery 4-Bromofluorobenzene (Surr)100 11/10/23 21:32 178-120 Dibromofluoromethane (Surr)99 11/10/23 21:32 177-120 Toluene-d8 (Surr)101 11/10/23 21:32 180-125 Lab Sample ID: 280-183916-6Client Sample ID: HIMW11-GW-1023 Matrix: WaterDate Collected: 10/30/23 12:40 Date Received: 11/01/23 09:45 RL MDL 1.0 U 1.0 0.58 ug/L 11/11/23 02:30 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier 1,1,1,2-Tetrachloroethane 1.0 0.39 ug/L 11/11/23 02:30 11.0 U1,1,1-Trichloroethane 1.0 0.21 ug/L 11/11/23 02:30 11.0 U1,1,2,2-Tetrachloroethane 1.0 0.27 ug/L 11/11/23 02:30 11.0 U1,1,2-Trichloroethane 1.0 0.22 ug/L 11/11/23 02:30 11.0 U1,1-Dichloroethane 1.0 0.23 ug/L 11/11/23 02:30 11.0 U1,1-Dichloroethene 1.0 0.42 ug/L 11/11/23 02:30 11.0 U1,1-Dichloropropene 2.0 0.70 ug/L 11/11/23 02:30 12.0 U1,2,3-Trichlorobenzene 2.5 0.86 ug/L 11/11/23 02:30 12.5 U1,2,3-Trichloropropane 1.0 0.58 ug/L 11/11/23 02:30 11.0 U1,2,4-Trichlorobenzene 1.0 0.15 ug/L 11/11/23 02:30 11.0 U1,2,4-Trimethylbenzene 5.0 1.8 ug/L 11/11/23 02:30 15.0 U1,2-Dibromo-3-Chloropropane 1.0 0.40 ug/L 11/11/23 02:30 11.0 U1,2-Dibromoethane (EDB) 1.0 0.37 ug/L 11/11/23 02:30 11.0 U1,2-Dichlorobenzene 1.0 0.54 ug/L 11/11/23 02:30 11.0 U1,2-Dichloroethane 1.0 0.52 ug/L 11/11/23 02:30 11.0 U1,2-Dichloropropane 1.0 0.37 ug/L 11/11/23 02:30 11.0 U1,3,5-Trimethylbenzene 1.0 0.33 ug/L 11/11/23 02:30 11.0 U1,3-Dichlorobenzene 1.0 0.38 ug/L 11/11/23 02:30 11.0 U1,3-Dichloropropane 1.0 0.39 ug/L 11/11/23 02:30 11.0 U1,4-Dichlorobenzene 1.0 0.38 ug/L 11/11/23 02:30 11.0 U2,2-Dichloropropane 15 6.0 ug/L 11/11/23 02:30 115U2-Butanone (MEK) 1.0 0.34 ug/L 11/11/23 02:30 11.0 U2-Chlorotoluene Eurofins Denver Page 18 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Client Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: SW846 8260D - Volatile Organic Compounds by GC/MS (Continued) Lab Sample ID: 280-183916-6Client Sample ID: HIMW11-GW-1023 Matrix: WaterDate Collected: 10/30/23 12:40 Date Received: 11/01/23 09:45 RL MDL 5.0 U 5.0 1.7 ug/L 11/11/23 02:30 1 Analyte Dil FacAnalyzedPreparedUnitDResultQualifier 2-Hexanone 1.0 0.21 ug/L 11/11/23 02:30 11.0 U4-Chlorotoluene 1.0 0.43 ug/L 11/11/23 02:30 11.0 U4-Isopropyltoluene 5.0 0.98 ug/L 11/11/23 02:30 15.0 U4-Methyl-2-pentanone (MIBK) 15 6.6 ug/L 11/11/23 02:30 115UAcetone 1.0 0.31 ug/L 11/11/23 02:30 11.0 UBenzene 1.0 0.40 ug/L 11/11/23 02:30 11.0 UBromobenzene 1.0 0.40 ug/L 11/11/23 02:30 11.0 UBromochloromethane 2.0 1.2 ug/L 11/11/23 02:30 12.0 UBromoform 5.0 2.4 ug/L 11/11/23 02:30 15.0 UBromomethane 1.0 0.57 ug/L 11/11/23 02:30 11.0 UCarbon tetrachloride 1.0 0.42 ug/L 11/11/23 02:30 11.0 UChlorobenzene 4.0 1.4 ug/L 11/11/23 02:30 14.0 UChloroethane 1.0 0.36 ug/L 11/11/23 02:30 11.0 UChloroform 2.0 0.75 ug/L 11/11/23 02:30 12.0 UChloromethane 1.0 0.32 ug/L 11/11/23 02:30 11.0 Ucis-1,2-Dichloroethene 2.0 0.63 ug/L 11/11/23 02:30 12.0 Ucis-1,3-Dichloropropene 2.0 0.62 ug/L 11/11/23 02:30 12.0 UDibromochloromethane 1.0 0.34 ug/L 11/11/23 02:30 11.0 UDibromomethane 1.0 0.39 ug/L 11/11/23 02:30 11.0 UDichlorobromomethane 3.0 0.96 ug/L 11/11/23 02:30 13.0 UDichlorodifluoromethane 1.0 0.30 ug/L 11/11/23 02:30 11.0 UEthylbenzene 2.0 1.2 ug/L 11/11/23 02:30 12.0 UHexachlorobutadiene 1.0 0.36 ug/L 11/11/23 02:30 11.0 UIsopropylbenzene 5.0 0.25 ug/L 11/11/23 02:30 15.0 UMethyl tert-butyl ether 2.0 0.94 ug/L 11/11/23 02:30 12.0 UMethylene Chloride 2.0 0.36 ug/L 11/11/23 02:30 12.0 Um-Xylene & p-Xylene 2.0 0.63 ug/L 11/11/23 02:30 12.0 UNaphthalene 1.0 0.48 ug/L 11/11/23 02:30 11.0 Un-Butylbenzene 1.0 0.53 ug/L 11/11/23 02:30 11.0 UN-Propylbenzene 1.0 0.33 ug/L 11/11/23 02:30 11.0 Uo-Xylene 1.0 0.45 ug/L 11/11/23 02:30 11.0 Usec-Butylbenzene 1.0 0.36 ug/L 11/11/23 02:30 11.0 UStyrene 1.0 0.42 ug/L 11/11/23 02:30 11.0 Utert-Butylbenzene 1.0 0.40 ug/L 11/11/23 02:30 11.0 UTetrachloroethene 1.0 0.32 ug/L 11/11/23 02:30 11.0 UToluene 1.0 0.37 ug/L 11/11/23 02:30 11.0 Utrans-1,2-Dichloroethene 2.0 0.65 ug/L 11/11/23 02:30 12.0 Utrans-1,3-Dichloropropene 1.0 0.30 ug/L 11/11/23 02:30 11.0 UTrichloroethene 2.0 0.57 ug/L 11/11/23 02:30 12.0 UTrichlorofluoromethane 2.0 0.51 ug/L 11/11/23 02:30 12.0 UVinyl chloride 1.0 0.33 ug/L 11/11/23 02:30 11.0 UXylenes, Total 1,2-Dichloroethane-d4 (Surr)99 70 -127 11/11/23 02:30 1 Surrogate Dil FacAnalyzedPreparedQualifierLimits%Recovery 4-Bromofluorobenzene (Surr)101 11/11/23 02:30 178-120 Dibromofluoromethane (Surr)98 11/11/23 02:30 177-120 Toluene-d8 (Surr)100 11/11/23 02:30 180-125 Eurofins Denver Page 19 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Surrogate Summary Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: 8260D - Volatile Organic Compounds by GC/MS Prep Type: Total/NAMatrix: Water Lab Sample ID Client Sample ID (70-127)(78-120)(77-120)(80-125) DCA BFB DBFM TOL 101 100 100 99280-183916-1 Percent Surrogate Recovery (Acceptance Limits) HIMW1-GW-1023 100 100 99 100280-183916-2 HIMW2-GW-1023 103 102 100 99280-183916-2 MS HIMW2-GW-1023 102 101 101 99280-183916-2 MSD HIMW2-GW-1023 100 100 98 99280-183916-3 HIMW3-GW-1023 102 99 100 99280-183916-4 HIMW5-GW-1023 102 100 99 101280-183916-5 TRIP BLANK 1023 99 101 98 100280-183916-6 HIMW11-GW-1023 104 101 101 99LCS 280-633533/4 Lab Control Sample 103 100 101 99LCSD 280-633533/6 Lab Control Sample Dup 101 99 97 101MB 280-633533/9 Method Blank Surrogate Legend DCA = 1,2-Dichloroethane-d4 (Surr) BFB = 4-Bromofluorobenzene (Surr) DBFM = Dibromofluoromethane (Surr) TOL = Toluene-d8 (Surr) Method: 8260D SIM - Volatile Organic Compounds (GC/MS) Prep Type: Total/NAMatrix: Water Lab Sample ID Client Sample ID (70-127) DCA 106280-183916-1 Percent Surrogate Recovery (Acceptance Limits) HIMW1-GW-1023 101280-183916-2 HIMW2-GW-1023 101280-183916-2 MS HIMW2-GW-1023 100280-183916-2 MSD HIMW2-GW-1023 100280-183916-3 HIMW3-GW-1023 101280-183916-4 HIMW5-GW-1023 104280-183916-5 TRIP BLANK 1023 104280-183916-6 HIMW11-GW-1023 100LCS 280-633287/1002 Lab Control Sample 104LCSD 280-633287/3 Lab Control Sample Dup 103MB 280-633287/5 Method Blank Surrogate Legend DCA = 1,2-Dichloroethane-d4 (Surr) Eurofins Denver Page 20 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 QC Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: 8260D - Volatile Organic Compounds by GC/MS Client Sample ID: Method BlankLab Sample ID: MB 280-633533/9 Matrix: Water Prep Type: Total/NA Analysis Batch: 633533 RL MDL 1,1,1,2-Tetrachloroethane 1.0 U 1.0 0.58 ug/L 11/10/23 20:23 1 MB MB Analyte Dil FacAnalyzedPreparedDUnitResultQualifier 1.0 U 0.391.0 ug/L 11/10/23 20:23 11,1,1-Trichloroethane 1.0 U 0.211.0 ug/L 11/10/23 20:23 11,1,2,2-Tetrachloroethane 1.0 U 0.271.0 ug/L 11/10/23 20:23 11,1,2-Trichloroethane 1.0 U 0.221.0 ug/L 11/10/23 20:23 11,1-Dichloroethane 1.0 U 0.231.0 ug/L 11/10/23 20:23 11,1-Dichloroethene 1.0 U 0.421.0 ug/L 11/10/23 20:23 11,1-Dichloropropene 2.0 U 0.702.0 ug/L 11/10/23 20:23 11,2,3-Trichlorobenzene 2.5 U 0.862.5 ug/L 11/10/23 20:23 11,2,3-Trichloropropane 1.0 U 0.581.0 ug/L 11/10/23 20:23 11,2,4-Trichlorobenzene 1.0 U 0.151.0 ug/L 11/10/23 20:23 11,2,4-Trimethylbenzene 5.0 U 1.85.0 ug/L 11/10/23 20:23 11,2-Dibromo-3-Chloropropane 1.0 U 0.401.0 ug/L 11/10/23 20:23 11,2-Dibromoethane (EDB) 1.0 U 0.371.0 ug/L 11/10/23 20:23 11,2-Dichlorobenzene 1.0 U 0.541.0 ug/L 11/10/23 20:23 11,2-Dichloroethane 1.0 U 0.521.0 ug/L 11/10/23 20:23 11,2-Dichloropropane 1.0 U 0.371.0 ug/L 11/10/23 20:23 11,3,5-Trimethylbenzene 1.0 U 0.331.0 ug/L 11/10/23 20:23 11,3-Dichlorobenzene 1.0 U 0.381.0 ug/L 11/10/23 20:23 11,3-Dichloropropane 1.0 U 0.391.0 ug/L 11/10/23 20:23 11,4-Dichlorobenzene 1.0 U 0.381.0 ug/L 11/10/23 20:23 12,2-Dichloropropane 15 U 6.015 ug/L 11/10/23 20:23 12-Butanone (MEK) 1.0 U 0.341.0 ug/L 11/10/23 20:23 12-Chlorotoluene 5.0 U 1.75.0 ug/L 11/10/23 20:23 12-Hexanone 1.0 U 0.211.0 ug/L 11/10/23 20:23 14-Chlorotoluene 1.0 U 0.431.0 ug/L 11/10/23 20:23 14-Isopropyltoluene 5.0 U 0.985.0 ug/L 11/10/23 20:23 14-Methyl-2-pentanone (MIBK) 15 U 6.615 ug/L 11/10/23 20:23 1Acetone 1.0 U 0.311.0 ug/L 11/10/23 20:23 1Benzene 1.0 U 0.401.0 ug/L 11/10/23 20:23 1Bromobenzene 1.0 U 0.401.0 ug/L 11/10/23 20:23 1Bromochloromethane 2.0 U 1.22.0 ug/L 11/10/23 20:23 1Bromoform 5.0 U 2.45.0 ug/L 11/10/23 20:23 1Bromomethane 1.0 U 0.571.0 ug/L 11/10/23 20:23 1Carbon tetrachloride 1.0 U 0.421.0 ug/L 11/10/23 20:23 1Chlorobenzene 4.0 U 1.44.0 ug/L 11/10/23 20:23 1Chloroethane 1.0 U 0.361.0 ug/L 11/10/23 20:23 1Chloroform 2.0 U 0.752.0 ug/L 11/10/23 20:23 1Chloromethane 1.0 U 0.321.0 ug/L 11/10/23 20:23 1cis-1,2-Dichloroethene 2.0 U 0.632.0 ug/L 11/10/23 20:23 1cis-1,3-Dichloropropene 2.0 U 0.622.0 ug/L 11/10/23 20:23 1Dibromochloromethane 1.0 U 0.341.0 ug/L 11/10/23 20:23 1Dibromomethane 1.0 U 0.391.0 ug/L 11/10/23 20:23 1Dichlorobromomethane 3.0 U 0.963.0 ug/L 11/10/23 20:23 1Dichlorodifluoromethane 1.0 U 0.301.0 ug/L 11/10/23 20:23 1Ethylbenzene 2.0 U 1.22.0 ug/L 11/10/23 20:23 1Hexachlorobutadiene 1.0 U 0.361.0 ug/L 11/10/23 20:23 1Isopropylbenzene 5.0 U 0.255.0 ug/L 11/10/23 20:23 1Methyl tert-butyl ether Eurofins Denver Page 21 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 QC Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: 8260D - Volatile Organic Compounds by GC/MS (Continued) Client Sample ID: Method BlankLab Sample ID: MB 280-633533/9 Matrix: Water Prep Type: Total/NA Analysis Batch: 633533 RL MDL Methylene Chloride 2.0 U 2.0 0.94 ug/L 11/10/23 20:23 1 MB MB Analyte Dil FacAnalyzedPreparedDUnitResultQualifier 2.0 U 0.362.0 ug/L 11/10/23 20:23 1m-Xylene & p-Xylene 2.0 U 0.632.0 ug/L 11/10/23 20:23 1Naphthalene 1.0 U 0.481.0 ug/L 11/10/23 20:23 1n-Butylbenzene 1.0 U 0.531.0 ug/L 11/10/23 20:23 1N-Propylbenzene 1.0 U 0.331.0 ug/L 11/10/23 20:23 1o-Xylene 1.0 U 0.451.0 ug/L 11/10/23 20:23 1sec-Butylbenzene 1.0 U 0.361.0 ug/L 11/10/23 20:23 1Styrene 1.0 U 0.421.0 ug/L 11/10/23 20:23 1tert-Butylbenzene 1.0 U 0.401.0 ug/L 11/10/23 20:23 1Tetrachloroethene 1.0 U 0.321.0 ug/L 11/10/23 20:23 1Toluene 1.0 U 0.371.0 ug/L 11/10/23 20:23 1trans-1,2-Dichloroethene 2.0 U 0.652.0 ug/L 11/10/23 20:23 1trans-1,3-Dichloropropene 1.0 U 0.301.0 ug/L 11/10/23 20:23 1Trichloroethene 2.0 U 0.572.0 ug/L 11/10/23 20:23 1Trichlorofluoromethane 2.0 U 0.512.0 ug/L 11/10/23 20:23 1Vinyl chloride 1.0 U 0.331.0 ug/L 11/10/23 20:23 1Xylenes, Total 1,2-Dichloroethane-d4 (Surr)101 70 -127 11/10/23 20:23 1 MB MB Surrogate Dil FacPreparedAnalyzedQualifierLimits%Recovery 99 11/10/23 20:23 14-Bromofluorobenzene (Surr)78 -120 97 11/10/23 20:23 1Dibromofluoromethane (Surr)77 -120 101 11/10/23 20:23 1Toluene-d8 (Surr)80 -125 Client Sample ID: Lab Control SampleLab Sample ID: LCS 280-633533/4 Matrix: Water Prep Type: Total/NA Analysis Batch: 633533 1,1,1,2-Tetrachloroethane 50.0 44.9 ug/L 90 74 -121 Analyte LCS LCS DUnitResultQualifier %Rec Spike Added %Rec Limits 1,1,1-Trichloroethane 50.0 49.6 ug/L 99 62 -132 1,1,2,2-Tetrachloroethane 50.0 50.9 ug/L 102 72 -122 1,1,2-Trichloroethane 50.0 50.2 ug/L 100 72 -128 1,1-Dichloroethane 50.0 48.8 ug/L 98 66 -130 1,1-Dichloroethene 50.0 47.1 ug/L 94 62 -130 1,1-Dichloropropene 50.0 49.6 ug/L 99 64 -133 1,2,3-Trichlorobenzene 50.0 45.4 ug/L 91 70 -127 1,2,3-Trichloropropane 50.0 50.5 ug/L 101 74 -123 1,2,4-Trichlorobenzene 50.0 45.9 ug/L 92 73 -124 1,2,4-Trimethylbenzene 50.0 48.1 ug/L 96 74 -124 1,2-Dibromo-3-Chloropropane 50.0 51.9 ug/L 104 58 -122 1,2-Dibromoethane (EDB)50.0 50.9 ug/L 102 81 -118 1,2-Dichlorobenzene 50.0 48.3 ug/L 97 77 -121 1,2-Dichloroethane 50.0 48.2 ug/L 96 61 -130 1,2-Dichloropropane 50.0 49.2 ug/L 98 68 -127 1,3,5-Trimethylbenzene 50.0 47.9 ug/L 96 73 -127 1,3-Dichlorobenzene 50.0 47.2 ug/L 94 76 -121 1,3-Dichloropropane 50.0 49.8 ug/L 100 80 -118 Eurofins Denver Page 22 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 QC Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: 8260D - Volatile Organic Compounds by GC/MS (Continued) Client Sample ID: Lab Control SampleLab Sample ID: LCS 280-633533/4 Matrix: Water Prep Type: Total/NA Analysis Batch: 633533 1,4-Dichlorobenzene 50.0 46.8 ug/L 94 76 -119 Analyte LCS LCS DUnitResultQualifier %Rec Spike Added %Rec Limits 2,2-Dichloropropane 50.0 50.8 ug/L 102 57 -140 2-Butanone (MEK)200 211 ug/L 105 53 -135 2-Chlorotoluene 50.0 47.2 ug/L 94 75 -123 2-Hexanone 200 218 ug/L 109 58 -134 4-Chlorotoluene 50.0 48.1 ug/L 96 74 -124 4-Isopropyltoluene 50.0 48.4 ug/L 97 74 -127 4-Methyl-2-pentanone (MIBK)200 218 ug/L 109 56 -135 Acetone 200 217 ug/L 108 50 -137 Benzene 50.0 47.8 ug/L 96 69 -126 Bromobenzene 50.0 47.7 ug/L 95 75 -122 Bromochloromethane 50.0 49.8 ug/L 100 71 -130 Bromoform 50.0 49.4 ug/L 99 57 -125 Bromomethane 50.0 40.1 ug/L 80 25 -163 Carbon tetrachloride 50.0 49.0 ug/L 98 60 -133 Chlorobenzene 50.0 47.5 ug/L 95 78 -118 Chloroethane 50.0 39.9 ug/L 80 52 -144 Chloroform 50.0 48.4 ug/L 97 68 -128 Chloromethane 50.0 39.1 ug/L 78 43 -142 cis-1,2-Dichloroethene 50.0 47.6 ug/L 95 69 -126 cis-1,3-Dichloropropene 50.0 51.6 ug/L 103 75 -120 Dibromochloromethane 50.0 52.1 ug/L 104 71 -122 Dibromomethane 50.0 48.7 ug/L 97 68 -129 Dichlorobromomethane 50.0 50.3 ug/L 101 67 -126 Dichlorodifluoromethane 50.0 36.4 ug/L 73 26 -152 Ethylbenzene 50.0 48.1 ug/L 96 76 -121 Hexachlorobutadiene 50.0 46.8 ug/L 94 69 -133 Isopropylbenzene 50.0 48.6 ug/L 97 70 -127 Methyl tert-butyl ether 50.0 51.9 ug/L 104 70 -127 Methylene Chloride 50.0 46.6 ug/L 93 64 -128 m-Xylene & p-Xylene 50.0 49.0 ug/L 98 76 -122 Naphthalene 50.0 48.1 ug/L 96 63 -129 n-Butylbenzene 50.0 48.3 ug/L 97 69 -130 N-Propylbenzene 50.0 47.5 ug/L 95 73 -127 o-Xylene 50.0 48.3 ug/L 97 77 -120 sec-Butylbenzene 50.0 46.8 ug/L 94 72 -127 Styrene 50.0 50.6 ug/L 101 79 -120 tert-Butylbenzene 50.0 47.5 ug/L 95 72 -126 Tetrachloroethene 50.0 48.0 ug/L 96 72 -127 Toluene 50.0 48.4 ug/L 97 68 -127 trans-1,2-Dichloroethene 50.0 48.4 ug/L 97 66 -129 trans-1,3-Dichloropropene 50.0 45.1 ug/L 90 66 -127 Trichloroethene 50.0 47.6 ug/L 95 70 -125 Trichlorofluoromethane 50.0 40.0 ug/L 80 57 -144 Vinyl chloride 50.0 40.4 ug/L 81 53 -141 Xylenes, Total 100 97.3 ug/L 97 77 -120 Eurofins Denver Page 23 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 QC Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: 8260D - Volatile Organic Compounds by GC/MS (Continued) Client Sample ID: Lab Control SampleLab Sample ID: LCS 280-633533/4 Matrix: Water Prep Type: Total/NA Analysis Batch: 633533 1,2-Dichloroethane-d4 (Surr)70 -127 Surrogate 104 LCS LCS Qualifier Limits%Recovery 1014-Bromofluorobenzene (Surr)78 -120 101Dibromofluoromethane (Surr)77 -120 99Toluene-d8 (Surr)80 -125 Client Sample ID: Lab Control Sample DupLab Sample ID: LCSD 280-633533/6 Matrix: Water Prep Type: Total/NA Analysis Batch: 633533 1,1,1,2-Tetrachloroethane 50.0 47.0 ug/L 94 74 -121 4 20 Analyte LCSD LCSD DUnitResultQualifier %Rec Spike Added %Rec Limits LimitRPD RPD 1,1,1-Trichloroethane 50.0 50.9 ug/L 102 62 -132 2 20 1,1,2,2-Tetrachloroethane 50.0 53.2 ug/L 106 72 -122 4 20 1,1,2-Trichloroethane 50.0 53.3 ug/L 107 72 -128 6 20 1,1-Dichloroethane 50.0 49.8 ug/L 100 66 -130 2 20 1,1-Dichloroethene 50.0 47.6 ug/L 95 62 -130 1 21 1,1-Dichloropropene 50.0 51.0 ug/L 102 64 -133 3 20 1,2,3-Trichlorobenzene 50.0 48.0 ug/L 96 70 -127 5 20 1,2,3-Trichloropropane 50.0 52.6 ug/L 105 74 -123 4 20 1,2,4-Trichlorobenzene 50.0 47.8 ug/L 96 73 -124 4 20 1,2,4-Trimethylbenzene 50.0 50.0 ug/L 100 74 -124 4 20 1,2-Dibromo-3-Chloropropane 50.0 54.1 ug/L 108 58 -122 4 21 1,2-Dibromoethane (EDB)50.0 53.2 ug/L 106 81 -118 4 20 1,2-Dichlorobenzene 50.0 50.9 ug/L 102 77 -121 5 20 1,2-Dichloroethane 50.0 50.1 ug/L 100 61 -130 4 20 1,2-Dichloropropane 50.0 50.2 ug/L 100 68 -127 2 20 1,3,5-Trimethylbenzene 50.0 49.7 ug/L 99 73 -127 4 20 1,3-Dichlorobenzene 50.0 49.4 ug/L 99 76 -121 5 20 1,3-Dichloropropane 50.0 52.0 ug/L 104 80 -118 4 20 1,4-Dichlorobenzene 50.0 49.0 ug/L 98 76 -119 5 20 2,2-Dichloropropane 50.0 51.3 ug/L 103 57 -140 1 22 2-Butanone (MEK)200 222 ug/L 111 53 -135 5 20 2-Chlorotoluene 50.0 48.6 ug/L 97 75 -123 3 20 2-Hexanone 200 234 ug/L 117 58 -134 7 21 4-Chlorotoluene 50.0 50.9 ug/L 102 74 -124 6 20 4-Isopropyltoluene 50.0 49.8 ug/L 100 74 -127 3 20 4-Methyl-2-pentanone (MIBK)200 228 ug/L 114 56 -135 4 20 Acetone 200 226 ug/L 113 50 -137 4 21 Benzene 50.0 49.4 ug/L 99 69 -126 3 20 Bromobenzene 50.0 50.3 ug/L 101 75 -122 5 20 Bromochloromethane 50.0 49.5 ug/L 99 71 -130 1 20 Bromoform 50.0 53.4 ug/L 107 57 -125 8 20 Bromomethane 50.0 42.1 ug/L 84 25 -163 5 40 Carbon tetrachloride 50.0 49.9 ug/L 100 60 -133 2 20 Chlorobenzene 50.0 49.4 ug/L 99 78 -118 4 20 Chloroethane 50.0 42.7 ug/L 85 52 -144 7 30 Chloroform 50.0 50.0 ug/L 100 68 -128 3 20 Chloromethane 50.0 41.1 ug/L 82 43 -142 5 20 Eurofins Denver Page 24 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 QC Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: 8260D - Volatile Organic Compounds by GC/MS (Continued) Client Sample ID: Lab Control Sample DupLab Sample ID: LCSD 280-633533/6 Matrix: Water Prep Type: Total/NA Analysis Batch: 633533 cis-1,2-Dichloroethene 50.0 49.2 ug/L 98 69 -126 3 20 Analyte LCSD LCSD DUnitResultQualifier %Rec Spike Added %Rec Limits LimitRPD RPD cis-1,3-Dichloropropene 50.0 53.0 ug/L 106 75 -120 3 20 Dibromochloromethane 50.0 53.2 ug/L 106 71 -122 2 20 Dibromomethane 50.0 49.3 ug/L 99 68 -129 1 20 Dichlorobromomethane 50.0 52.2 ug/L 104 67 -126 4 20 Dichlorodifluoromethane 50.0 39.4 ug/L 79 26 -152 8 21 Ethylbenzene 50.0 49.5 ug/L 99 76 -121 3 20 Hexachlorobutadiene 50.0 47.0 ug/L 94 69 -133 0 20 Isopropylbenzene 50.0 50.6 ug/L 101 70 -127 4 20 Methyl tert-butyl ether 50.0 53.5 ug/L 107 70 -127 3 20 Methylene Chloride 50.0 47.9 ug/L 96 64 -128 3 20 m-Xylene & p-Xylene 50.0 51.6 ug/L 103 76 -122 5 20 Naphthalene 50.0 50.9 ug/L 102 63 -129 6 21 n-Butylbenzene 50.0 49.7 ug/L 99 69 -130 3 20 N-Propylbenzene 50.0 49.0 ug/L 98 73 -127 3 20 o-Xylene 50.0 49.7 ug/L 99 77 -120 3 20 sec-Butylbenzene 50.0 48.1 ug/L 96 72 -127 3 20 Styrene 50.0 52.3 ug/L 105 79 -120 3 20 tert-Butylbenzene 50.0 48.8 ug/L 98 72 -126 3 20 Tetrachloroethene 50.0 50.3 ug/L 101 72 -127 5 20 Toluene 50.0 49.7 ug/L 99 68 -127 3 20 trans-1,2-Dichloroethene 50.0 49.2 ug/L 98 66 -129 2 20 trans-1,3-Dichloropropene 50.0 45.9 ug/L 92 66 -127 2 20 Trichloroethene 50.0 49.6 ug/L 99 70 -125 4 20 Trichlorofluoromethane 50.0 43.1 ug/L 86 57 -144 7 28 Vinyl chloride 50.0 42.5 ug/L 85 53 -141 5 25 Xylenes, Total 100 101 ug/L 101 77 -120 4 20 1,2-Dichloroethane-d4 (Surr)70 -127 Surrogate 103 LCSD LCSD Qualifier Limits%Recovery 1004-Bromofluorobenzene (Surr)78 -120 101Dibromofluoromethane (Surr)77 -120 99Toluene-d8 (Surr)80 -125 Client Sample ID: HIMW2-GW-1023Lab Sample ID: 280-183916-2 MS Matrix: Water Prep Type: Total/NA Analysis Batch: 633533 1,1,1,2-Tetrachloroethane 1.0 U 50.0 41.9 ug/L 84 74 -121 Analyte MS MS DUnitResultQualifier %Rec Spike Added Sample Result Sample Qualifier %Rec Limits 1,1,1-Trichloroethane 1.0 U 50.0 46.9 ug/L 94 62 -132 1,1,2,2-Tetrachloroethane 1.0 U 50.0 48.4 ug/L 97 72 -122 1,1,2-Trichloroethane 1.5 50.0 49.4 ug/L 96 72 -128 1,1-Dichloroethane 1.0 U 50.0 46.7 ug/L 93 66 -130 1,1-Dichloroethene 4.0 50.0 49.7 ug/L 91 62 -130 1,1-Dichloropropene 1.0 U 50.0 48.4 ug/L 97 64 -133 1,2,3-Trichlorobenzene 2.0 U 50.0 40.0 ug/L 80 70 -127 1,2,3-Trichloropropane 2.5 U 50.0 48.5 ug/L 97 74 -123 Eurofins Denver Page 25 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 QC Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: 8260D - Volatile Organic Compounds by GC/MS (Continued) Client Sample ID: HIMW2-GW-1023Lab Sample ID: 280-183916-2 MS Matrix: Water Prep Type: Total/NA Analysis Batch: 633533 1,2,4-Trichlorobenzene 1.0 U 50.0 42.5 ug/L 85 73 -124 Analyte MS MS DUnitResultQualifier %Rec Spike Added Sample Result Sample Qualifier %Rec Limits 1,2,4-Trimethylbenzene 1.0 U 50.0 47.9 ug/L 96 74 -124 1,2-Dibromo-3-Chloropropane 5.0 U 50.0 44.7 ug/L 89 58 -122 1,2-Dibromoethane (EDB)1.0 U 50.0 47.9 ug/L 96 81 -118 1,2-Dichlorobenzene 1.0 U 50.0 47.1 ug/L 94 77 -121 1,2-Dichloroethane 6.5 50.0 53.2 ug/L 93 61 -130 1,2-Dichloropropane 1.0 U 50.0 47.6 ug/L 95 68 -127 1,3,5-Trimethylbenzene 1.0 U 50.0 47.7 ug/L 95 73 -127 1,3-Dichlorobenzene 1.0 U 50.0 46.5 ug/L 93 76 -121 1,3-Dichloropropane 1.0 U 50.0 48.5 ug/L 97 80 -118 1,4-Dichlorobenzene 1.0 U 50.0 46.1 ug/L 92 76 -119 2,2-Dichloropropane 1.0 U 50.0 41.4 ug/L 83 57 -140 2-Butanone (MEK)15 U 200 185 ug/L 93 53 -135 2-Chlorotoluene 1.0 U 50.0 46.8 ug/L 94 75 -123 2-Hexanone 5.0 U 200 193 ug/L 96 58 -134 4-Chlorotoluene 1.0 U 50.0 48.2 ug/L 96 74 -124 4-Isopropyltoluene 1.0 U 50.0 48.3 ug/L 97 74 -127 4-Methyl-2-pentanone (MIBK)5.0 U 200 192 ug/L 96 56 -135 Acetone 15 U 200 185 ug/L 93 50 -137 Benzene 1.0 U 50.0 46.9 ug/L 94 69 -126 Bromobenzene 1.0 U 50.0 47.4 ug/L 95 75 -122 Bromochloromethane 1.0 U 50.0 47.9 ug/L 96 71 -130 Bromoform 2.0 U 50.0 45.5 ug/L 91 57 -125 Bromomethane 5.0 U 50.0 40.7 ug/L 81 25 -163 Carbon tetrachloride 1.0 U 50.0 46.9 ug/L 94 60 -133 Chlorobenzene 1.0 U 50.0 45.6 ug/L 91 78 -118 Chloroethane 4.0 U 50.0 46.8 ug/L 94 52 -144 Chloroform 0.69 J 50.0 48.0 ug/L 95 68 -128 Chloromethane 2.0 U F2 50.0 45.0 ug/L 90 43 -142 cis-1,2-Dichloroethene 1.0 U 50.0 46.0 ug/L 92 69 -126 cis-1,3-Dichloropropene 2.0 U 50.0 46.8 ug/L 94 75 -120 Dibromochloromethane 2.0 U 50.0 47.9 ug/L 96 71 -122 Dibromomethane 1.0 U 50.0 46.5 ug/L 93 68 -129 Dichlorobromomethane 1.0 U 50.0 48.2 ug/L 96 67 -126 Dichlorodifluoromethane 3.0 U 50.0 46.2 ug/L 92 26 -152 Ethylbenzene 1.0 U 50.0 46.1 ug/L 92 76 -121 Hexachlorobutadiene 2.0 U 50.0 44.1 ug/L 88 69 -133 Isopropylbenzene 1.0 U 50.0 48.5 ug/L 97 70 -127 Methyl tert-butyl ether 5.0 U 50.0 47.3 ug/L 95 70 -127 Methylene Chloride 2.0 U 50.0 45.5 ug/L 91 64 -128 m-Xylene & p-Xylene 2.0 U 50.0 47.0 ug/L 94 76 -122 Naphthalene 2.0 U 50.0 41.9 ug/L 84 63 -129 n-Butylbenzene 1.0 U 50.0 47.3 ug/L 95 69 -130 N-Propylbenzene 1.0 U 50.0 46.7 ug/L 93 73 -127 o-Xylene 1.0 U 50.0 45.9 ug/L 92 77 -120 sec-Butylbenzene 1.0 U 50.0 45.9 ug/L 92 72 -127 Styrene 1.0 U 50.0 48.7 ug/L 97 79 -120 tert-Butylbenzene 1.0 U 50.0 48.3 ug/L 97 72 -126 Tetrachloroethene 1.0 U 50.0 45.9 ug/L 92 72 -127 Eurofins Denver Page 26 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 QC Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: 8260D - Volatile Organic Compounds by GC/MS (Continued) Client Sample ID: HIMW2-GW-1023Lab Sample ID: 280-183916-2 MS Matrix: Water Prep Type: Total/NA Analysis Batch: 633533 Toluene 1.0 U 50.0 46.5 ug/L 93 68 -127 Analyte MS MS DUnitResultQualifier %Rec Spike Added Sample Result Sample Qualifier %Rec Limits trans-1,2-Dichloroethene 1.0 U 50.0 46.5 ug/L 93 66 -129 trans-1,3-Dichloropropene 2.0 U 50.0 39.8 ug/L 80 66 -127 Trichloroethene 85 F1 50.0 113 F1 ug/L 56 70 -125 Trichlorofluoromethane 2.0 U 50.0 49.3 ug/L 99 57 -144 Vinyl chloride 2.0 U 50.0 48.2 ug/L 96 53 -141 Xylenes, Total 1.0 U 100 92.9 ug/L 93 77 -120 1,2-Dichloroethane-d4 (Surr)70 -127 Surrogate 103 MS MS Qualifier Limits%Recovery 1024-Bromofluorobenzene (Surr)78 -120 100Dibromofluoromethane (Surr)77 -120 99Toluene-d8 (Surr)80 -125 Client Sample ID: HIMW2-GW-1023Lab Sample ID: 280-183916-2 MSD Matrix: Water Prep Type: Total/NA Analysis Batch: 633533 1,1,1,2-Tetrachloroethane 1.0 U 50.0 43.9 ug/L 88 74 -121 5 20 Analyte MSD MSD DUnitResultQualifier %Rec Spike Added Sample Result Sample Qualifier %Rec Limits LimitRPD RPD 1,1,1-Trichloroethane 1.0 U 50.0 48.5 ug/L 97 62 -132 3 20 1,1,2,2-Tetrachloroethane 1.0 U 50.0 48.6 ug/L 97 72 -122 0 20 1,1,2-Trichloroethane 1.5 50.0 51.1 ug/L 99 72 -128 3 20 1,1-Dichloroethane 1.0 U 50.0 48.3 ug/L 97 66 -130 3 20 1,1-Dichloroethene 4.0 50.0 50.6 ug/L 93 62 -130 2 21 1,1-Dichloropropene 1.0 U 50.0 49.6 ug/L 99 64 -133 2 20 1,2,3-Trichlorobenzene 2.0 U 50.0 45.3 ug/L 91 70 -127 12 20 1,2,3-Trichloropropane 2.5 U 50.0 47.5 ug/L 95 74 -123 2 20 1,2,4-Trichlorobenzene 1.0 U 50.0 44.0 ug/L 88 73 -124 4 20 1,2,4-Trimethylbenzene 1.0 U 50.0 47.8 ug/L 96 74 -124 0 20 1,2-Dibromo-3-Chloropropane 5.0 U 50.0 47.2 ug/L 94 58 -122 5 21 1,2-Dibromoethane (EDB)1.0 U 50.0 48.2 ug/L 96 81 -118 1 20 1,2-Dichlorobenzene 1.0 U 50.0 47.3 ug/L 95 77 -121 0 20 1,2-Dichloroethane 6.5 50.0 54.0 ug/L 95 61 -130 1 20 1,2-Dichloropropane 1.0 U 50.0 48.1 ug/L 96 68 -127 1 20 1,3,5-Trimethylbenzene 1.0 U 50.0 48.0 ug/L 96 73 -127 1 20 1,3-Dichlorobenzene 1.0 U 50.0 46.2 ug/L 92 76 -121 1 20 1,3-Dichloropropane 1.0 U 50.0 48.2 ug/L 96 80 -118 1 20 1,4-Dichlorobenzene 1.0 U 50.0 46.1 ug/L 92 76 -119 0 20 2,2-Dichloropropane 1.0 U 50.0 43.5 ug/L 87 57 -140 5 22 2-Butanone (MEK)15 U 200 191 ug/L 95 53 -135 3 20 2-Chlorotoluene 1.0 U 50.0 46.7 ug/L 93 75 -123 0 20 2-Hexanone 5.0 U 200 196 ug/L 98 58 -134 2 21 4-Chlorotoluene 1.0 U 50.0 47.5 ug/L 95 74 -124 1 20 4-Isopropyltoluene 1.0 U 50.0 47.8 ug/L 96 74 -127 1 20 4-Methyl-2-pentanone (MIBK)5.0 U 200 199 ug/L 100 56 -135 3 20 Acetone 15 U 200 192 ug/L 96 50 -137 3 21 Benzene 1.0 U 50.0 47.4 ug/L 95 69 -126 1 20 Eurofins Denver Page 27 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 QC Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: 8260D - Volatile Organic Compounds by GC/MS (Continued) Client Sample ID: HIMW2-GW-1023Lab Sample ID: 280-183916-2 MSD Matrix: Water Prep Type: Total/NA Analysis Batch: 633533 Bromobenzene 1.0 U 50.0 47.5 ug/L 95 75 -122 0 20 Analyte MSD MSD DUnitResultQualifier %Rec Spike Added Sample Result Sample Qualifier %Rec Limits LimitRPD RPD Bromochloromethane 1.0 U 50.0 48.0 ug/L 96 71 -130 0 20 Bromoform 2.0 U 50.0 47.1 ug/L 94 57 -125 3 20 Bromomethane 5.0 U 50.0 37.6 ug/L 75 25 -163 8 40 Carbon tetrachloride 1.0 U 50.0 49.9 ug/L 100 60 -133 6 20 Chlorobenzene 1.0 U 50.0 46.3 ug/L 93 78 -118 1 20 Chloroethane 4.0 U 50.0 38.2 ug/L 76 52 -144 20 30 Chloroform 0.69 J 50.0 48.3 ug/L 95 68 -128 0 20 Chloromethane 2.0 U F2 50.0 36.2 F2 ug/L 72 43 -142 22 20 cis-1,2-Dichloroethene 1.0 U 50.0 46.9 ug/L 94 69 -126 2 20 cis-1,3-Dichloropropene 2.0 U 50.0 47.8 ug/L 96 75 -120 2 20 Dibromochloromethane 2.0 U 50.0 49.6 ug/L 99 71 -122 3 20 Dibromomethane 1.0 U 50.0 47.1 ug/L 94 68 -129 1 20 Dichlorobromomethane 1.0 U 50.0 49.4 ug/L 99 67 -126 3 20 Dichlorodifluoromethane 3.0 U 50.0 37.3 ug/L 75 26 -152 21 21 Ethylbenzene 1.0 U 50.0 47.0 ug/L 94 76 -121 2 20 Hexachlorobutadiene 2.0 U 50.0 44.8 ug/L 90 69 -133 2 20 Isopropylbenzene 1.0 U 50.0 48.4 ug/L 97 70 -127 0 20 Methyl tert-butyl ether 5.0 U 50.0 49.1 ug/L 98 70 -127 4 20 Methylene Chloride 2.0 U 50.0 45.4 ug/L 91 64 -128 0 20 m-Xylene & p-Xylene 2.0 U 50.0 48.4 ug/L 97 76 -122 3 20 Naphthalene 2.0 U 50.0 47.8 ug/L 96 63 -129 13 21 n-Butylbenzene 1.0 U 50.0 47.4 ug/L 95 69 -130 0 20 N-Propylbenzene 1.0 U 50.0 47.6 ug/L 95 73 -127 2 20 o-Xylene 1.0 U 50.0 47.1 ug/L 94 77 -120 3 20 sec-Butylbenzene 1.0 U 50.0 46.4 ug/L 93 72 -127 1 20 Styrene 1.0 U 50.0 48.7 ug/L 97 79 -120 0 20 tert-Butylbenzene 1.0 U 50.0 47.9 ug/L 96 72 -126 1 20 Tetrachloroethene 1.0 U 50.0 46.8 ug/L 94 72 -127 2 20 Toluene 1.0 U 50.0 47.9 ug/L 96 68 -127 3 20 trans-1,2-Dichloroethene 1.0 U 50.0 46.8 ug/L 94 66 -129 1 20 trans-1,3-Dichloropropene 2.0 U 50.0 42.0 ug/L 84 66 -127 6 20 Trichloroethene 85 F1 50.0 114 F1 ug/L 57 70 -125 0 20 Trichlorofluoromethane 2.0 U 50.0 39.9 ug/L 80 57 -144 21 28 Vinyl chloride 2.0 U 50.0 39.0 ug/L 78 53 -141 21 25 Xylenes, Total 1.0 U 100 95.5 ug/L 96 77 -120 3 20 1,2-Dichloroethane-d4 (Surr)70 -127 Surrogate 102 MSD MSD Qualifier Limits%Recovery 1014-Bromofluorobenzene (Surr)78 -120 101Dibromofluoromethane (Surr)77 -120 99Toluene-d8 (Surr)80 -125 Eurofins Denver Page 28 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 QC Sample Results Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah Method: 8260D SIM - Volatile Organic Compounds (GC/MS) Client Sample ID: Method BlankLab Sample ID: MB 280-633287/5 Matrix: Water Prep Type: Total/NA Analysis Batch: 633287 RL MDL 1,4-Dioxane 1.4 U 1.4 0.24 ug/L 11/09/23 13:48 1 MB MB Analyte Dil FacAnalyzedPreparedDUnitResultQualifier 1,2-Dichloroethane-d4 (Surr)103 70 -127 11/09/23 13:48 1 MB MB Surrogate Dil FacPreparedAnalyzedQualifierLimits%Recovery Client Sample ID: Lab Control SampleLab Sample ID: LCS 280-633287/1002 Matrix: Water Prep Type: Total/NA Analysis Batch: 633287 1,4-Dioxane 50.0 48.5 ug/L 97 25 -141 Analyte LCS LCS DUnitResultQualifier %Rec Spike Added %Rec Limits 1,2-Dichloroethane-d4 (Surr)70 -127 Surrogate 100 LCS LCS Qualifier Limits%Recovery Client Sample ID: Lab Control Sample DupLab Sample ID: LCSD 280-633287/3 Matrix: Water Prep Type: Total/NA Analysis Batch: 633287 1,4-Dioxane 50.0 54.3 ug/L 109 25 -141 11 20 Analyte LCSD LCSD DUnitResultQualifier %Rec Spike Added %Rec Limits LimitRPD RPD 1,2-Dichloroethane-d4 (Surr)70 -127 Surrogate 104 LCSD LCSD Qualifier Limits%Recovery Client Sample ID: HIMW2-GW-1023Lab Sample ID: 280-183916-2 MS Matrix: Water Prep Type: Total/NA Analysis Batch: 633287 1,4-Dioxane 3.7 25.0 29.8 ug/L 104 25 -141 Analyte MS MS DUnitResultQualifier %Rec Spike Added Sample Result Sample Qualifier %Rec Limits 1,2-Dichloroethane-d4 (Surr)70 -127 Surrogate 101 MS MS Qualifier Limits%Recovery Client Sample ID: HIMW2-GW-1023Lab Sample ID: 280-183916-2 MSD Matrix: Water Prep Type: Total/NA Analysis Batch: 633287 1,4-Dioxane 3.7 25.0 30.6 ug/L 107 25 -141 3 20 Analyte MSD MSD DUnitResultQualifier %Rec Spike Added Sample Result Sample Qualifier %Rec Limits LimitRPD RPD 1,2-Dichloroethane-d4 (Surr)70 -127 Surrogate 100 MSD MSD Qualifier Limits%Recovery Eurofins Denver Page 29 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 QC Association Summary Job ID: 280-183916-1Client: Geosyntec Consultants Inc Project/Site: Ashland Former Bacchus Plant 3 Utah GC/MS VOA Analysis Batch: 633287 Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch Water 8260D SIM280-183916-1 HIMW1-GW-1023 Total/NA Water 8260D SIM280-183916-2 HIMW2-GW-1023 Total/NA Water 8260D SIM280-183916-3 HIMW3-GW-1023 Total/NA Water 8260D SIM280-183916-4 HIMW5-GW-1023 Total/NA Water 8260D SIM280-183916-5 TRIP BLANK 1023 Total/NA Water 8260D SIM280-183916-6 HIMW11-GW-1023 Total/NA Water 8260D SIMMB 280-633287/5 Method Blank Total/NA Water 8260D SIMLCS 280-633287/1002 Lab Control Sample Total/NA Water 8260D SIMLCSD 280-633287/3 Lab Control Sample Dup Total/NA Water 8260D SIM280-183916-2 MS HIMW2-GW-1023 Total/NA Water 8260D SIM280-183916-2 MSD HIMW2-GW-1023 Total/NA Analysis Batch: 633533 Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch Water 8260D280-183916-1 HIMW1-GW-1023 Total/NA Water 8260D280-183916-2 HIMW2-GW-1023 Total/NA Water 8260D280-183916-3 HIMW3-GW-1023 Total/NA Water 8260D280-183916-4 HIMW5-GW-1023 Total/NA Water 8260D280-183916-5 TRIP BLANK 1023 Total/NA Water 8260D280-183916-6 HIMW11-GW-1023 Total/NA Water 8260DMB 280-633533/9 Method Blank Total/NA Water 8260DLCS 280-633533/4 Lab Control Sample Total/NA Water 8260DLCSD 280-633533/6 Lab Control Sample Dup Total/NA Water 8260D280-183916-2 MS HIMW2-GW-1023 Total/NA Water 8260D280-183916-2 MSD HIMW2-GW-1023 Total/NA Eurofins Denver Page 30 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Lab Chronicle Client: Geosyntec Consultants Inc Job ID: 280-183916-1 Project/Site: Ashland Former Bacchus Plant 3 Utah Client Sample ID: HIMW1-GW-1023 Lab Sample ID: 280-183916-1 Matrix: WaterDate Collected: 10/30/23 12:05 Date Received: 11/01/23 09:45 Analysis 8260D BMJ11/11/23 01:051 EET DEN633533 Type Batch Method Batch Prep Type LabAnalystRun Prepared or Analyzed Initial Amount Amount Final Batch NumberFactor Dil Total/NA 5 mL 5 mL Analysis 8260D SIM 1 633287 11/09/23 16:13 GO EET DENTotal/NA 5 mL 5 mL Client Sample ID: HIMW2-GW-1023 Lab Sample ID: 280-183916-2 Matrix: WaterDate Collected: 10/30/23 15:10 Date Received: 11/01/23 09:45 Analysis 8260D BMJ11/11/23 01:261 EET DEN633533 Type Batch Method Batch Prep Type LabAnalystRun Prepared or Analyzed Initial Amount Amount Final Batch NumberFactor Dil Total/NA 5 mL 5 mL Analysis 8260D SIM 1 633287 11/09/23 16:34 GO EET DENTotal/NA 5 mL 5 mL Client Sample ID: HIMW3-GW-1023 Lab Sample ID: 280-183916-3 Matrix: WaterDate Collected: 10/30/23 13:05 Date Received: 11/01/23 09:45 Analysis 8260D BMJ11/11/23 01:471 EET DEN633533 Type Batch Method Batch Prep Type LabAnalystRun Prepared or Analyzed Initial Amount Amount Final Batch NumberFactor Dil Total/NA 5 mL 5 mL Analysis 8260D SIM 1 633287 11/09/23 16:55 GO EET DENTotal/NA 5 mL 5 mL Client Sample ID: HIMW5-GW-1023 Lab Sample ID: 280-183916-4 Matrix: WaterDate Collected: 10/30/23 14:10 Date Received: 11/01/23 09:45 Analysis 8260D BMJ11/11/23 02:081 EET DEN633533 Type Batch Method Batch Prep Type LabAnalystRun Prepared or Analyzed Initial Amount Amount Final Batch NumberFactor Dil Total/NA 5 mL 5 mL Analysis 8260D SIM 1 633287 11/09/23 17:16 GO EET DENTotal/NA 5 mL 5 mL Client Sample ID: TRIP BLANK 1023 Lab Sample ID: 280-183916-5 Matrix: WaterDate Collected: 10/30/23 00:00 Date Received: 11/01/23 09:45 Analysis 8260D BMJ11/10/23 21:321 EET DEN633533 Type Batch Method Batch Prep Type LabAnalystRun Prepared or Analyzed Initial Amount Amount Final Batch NumberFactor Dil Total/NA 5 mL 5 mL Analysis 8260D SIM 1 633287 11/09/23 14:09 GO EET DENTotal/NA 5 mL 5 mL Client Sample ID: HIMW11-GW-1023 Lab Sample ID: 280-183916-6 Matrix: WaterDate Collected: 10/30/23 12:40 Date Received: 11/01/23 09:45 Analysis 8260D BMJ11/11/23 02:301 EET DEN633533 Type Batch Method Batch Prep Type LabAnalystRun Prepared or Analyzed Initial Amount Amount Final Batch NumberFactor Dil Total/NA 5 mL 5 mL Analysis 8260D SIM 1 633287 11/09/23 17:36 GO EET DENTotal/NA 5 mL 5 mL Laboratory References: EET DEN = Eurofins Denver, 4955 Yarrow Street, Arvada, CO 80002, TEL (303)736-0100 Eurofins Denver Page 31 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Accreditation/Certification Summary Client: Geosyntec Consultants Inc Job ID: 280-183916-1 Project/Site: Ashland Former Bacchus Plant 3 Utah Laboratory: Eurofins Denver Unless otherwise noted, all analytes for this laboratory were covered under each accreditation/certification below. Authority Program Identification Number Expiration Date Utah NELAP CO000262019-11 07-31-24 The following analytes are included in this report, but the laboratory is not certified by the governing authority. This list may include analytes for which the agency does not offer certification. Analysis Method Prep Method Matrix Analyte 8260D Water Xylenes, Total Eurofins Denver Page 32 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Page 33 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Login Sample Receipt Checklist Client: Geosyntec Consultants Inc Job Number: 280-183916-1 Login Number: 183916 Question Answer Comment Creator: Little, Matthew L List Source: Eurofins Denver List Number: 1 N/ARadioactivity wasn't checked or is </= background as measured by a survey meter. TrueThe cooler's custody seal, if present, is intact. TrueSample custody seals, if present, are intact. TrueThe cooler or samples do not appear to have been compromised or tampered with. TrueSamples were received on ice. TrueCooler Temperature is acceptable. TrueCooler Temperature is recorded. TrueCOC is present. TrueCOC is filled out in ink and legible. TrueCOC is filled out with all pertinent information. TrueIs the Field Sampler's name present on COC? TrueThere are no discrepancies between the containers received and the COC. TrueSamples are received within Holding Time (excluding tests with immediate HTs) TrueSample containers have legible labels. TrueContainers are not broken or leaking. TrueSample collection date/times are provided. TrueAppropriate sample containers are used. TrueSample bottles are completely filled. N/ASample Preservation Verified. TrueThere is sufficient vol. for all requested analyses, incl. any requested MS/MSDs FalseContainers requiring zero headspace have no headspace or bubble is <6mm (1/4"). Headspace larger than 1/4''. TrueMultiphasic samples are not present. TrueSamples do not require splitting or compositing. N/AResidual Chlorine Checked. Eurofins Denver Page 34 of 34 11/13/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 APPENDIX C Time Series Plots HIMW-1 Analyte First Sample Most Recent Sample Linear Trend (ug/L/year) Mann-Kendall Statistic p-value Trend Result 1,1 DCA 20-03-2008 30-10-2023 -5.84e-32 0 0.500 Stable 1,1 DCE 20-03-2008 30-10-2023 -0.000990 -9 0.161 Stable 1,1,1 TCA 20-03-2008 30-10-2023 -1.17e-31 0 0.500 Stable 1,1,2 Trichloroethane 20-03-2008 30-10-2023 NA 0 0.500 Stable 1,2 DCA 20-03-2008 30-10-2023 -5.84e-32 0 0.500 Stable 1,2,3 Trichlorobenzene 25-01-2013 30-10-2023 1.93e-30 0 0.500 Stable 1,2,4 Trimethylbenzene 20-03-2008 30-10-2023 -0.000227 -3 0.402 Stable 1,4 Dioxane 13-10-2021 30-10-2023 NA Not enough data nan not enough data Acetone 20-03-2008 30-10-2023 -0.0863 -13 0.068 Probably Decreasing Benzene 20-03-2008 30-10-2023 NA 0 0.500 Stable Carbon Tetrachloride 20-03-2008 30-10-2023 2.92e-32 0 0.500 Stable Analyte First Sample Most Recent Sample Linear Trend (ug/L/year) Mann-Kendall Statistic p-value Trend Result Chloroform 20-03-2008 30-10-2023 NA 0 0.500 Stable Dichlorobromomethane 20-03-2008 30-10-2023 2.92e-32 0 0.500 Stable Ethylbenzene 20-03-2008 30-10-2023 NA 0 0.500 Stable MEK 20-03-2008 30-10-2023 NA 0 0.500 Stable Methylene Chloride 20-03-2008 30-10-2023 NA 0 0.500 Stable Naphthalene 20-03-2008 30-10-2023 -1.17e-31 0 0.500 Stable PCE 20-03-2008 30-10-2023 5.84e-32 0 0.500 Stable TCE 20-03-2008 30-10-2023 5.84e-32 0 0.500 Stable Toluene 20-03-2008 30-10-2023 2.92e-32 0 0.500 Stable cis-1,2 DCE 20-03-2008 30-10-2023 2.92e-32 0 0.500 Stable trans-1,2 DCE 20-03-2008 30-10-2023 NA 0 0.500 Stable HIMW-2 Analyte First Sample Most Recent Sample Linear Trend (ug/L/year) Mann-Kendall Statistic p-value Trend Result 1,1 DCA 19-03-2008 30-10-2023 -0.0599 -49 0.001 Decreasing 1,1 DCE 19-03-2008 30-10-2023 -1.44 -70 <0.001 Decreasing 1,1,1 TCA 19-03-2008 30-10-2023 -0.433 -62 <0.001 Decreasing 1,1,2 Trichloroethane 19-03-2008 30-10-2023 -0.316 -74 <0.001 Decreasing 1,2 DCA 19-03-2008 30-10-2023 0.134 23 0.114 No Trend 1,2,3 Trichlorobenzene 25-01-2013 30-10-2023 1.93e-30 0 0.500 Stable 1,2,4 Trimethylbenzene 19-03-2008 30-10-2023 -1.46e-31 0 0.500 Stable 1,4 Dioxane 13-10-2021 30-10-2023 NA Not enough data nan not enough data Acetone 19-03-2008 30-10-2023 0.0164 1 0.500 No Trend Benzene 19-03-2008 30-10-2023 NA 0 0.500 Stable Carbon Tetrachloride 19-03-2008 30-10-2023 -0.123 -73 <0.001 Decreasing Chloroform 19-03-2008 30-10-2023 -0.192 -76 <0.001 Decreasing Analyte First Sample Most Recent Sample Linear Trend (ug/L/year) Mann-Kendall Statistic p-value Trend Result Dichlorobromomethane 19-03-2008 30-10-2023 -0.0146 -13 0.068 Probably Decreasing Ethylbenzene 19-03-2008 30-10-2023 NA 0 0.500 Stable MEK 19-03-2008 30-10-2023 0.0000896 1 0.500 No Trend Methylene Chloride 19-03-2008 30-10-2023 -0.0447 -28 0.067 Probably Decreasing Naphthalene 19-03-2008 30-10-2023 5.84e-31 0 0.500 Stable PCE 19-03-2008 30-10-2023 -2.92e-31 0 0.500 Stable TCE 19-03-2008 30-10-2023 -12.6 -72 <0.001 Decreasing Toluene 19-03-2008 30-10-2023 -1.46e-31 0 0.500 Stable cis-1,2 DCE 19-03-2008 30-10-2023 -1.46e-31 0 0.500 Stable trans-1,2 DCE 19-03-2008 30-10-2023 NA 0 0.500 Stable HIMW-3 Analyte First Sample Most Recent Sample Linear Trend (ug/L/year) Mann-Kendall Statistic p-value Trend Result 1,1 DCA 28-05-2015 30-10-2023 -5.91e-31 0 0.500 Stable 1,1 DCE 28-05-2015 30-10-2023 4.61 -15 0.168 Stable 1,1,1 TCA 28-05-2015 30-10-2023 -1.98 -35 0.010 Decreasing 1,1,2 Trichloroethane 28-05-2015 30-10-2023 NA 0 0.500 Stable 1,2 DCA 28-05-2015 30-10-2023 -5.91e-31 0 0.500 Stable 1,2,3 Trichlorobenzene 28-05-2015 30-10-2023 -1.77e-30 0 0.500 Stable 1,2,4 Trimethylbenzene 28-05-2015 30-10-2023 NA 0 0.500 Stable 1,4 Dioxane 13-10-2021 30-10-2023 NA Not enough data nan not enough data Acetone 28-05-2015 30-10-2023 0.00138 3 0.386 No Trend Benzene 28-05-2015 30-10-2023 NA 0 0.500 Stable Carbon Tetrachloride 28-05-2015 30-10-2023 2.95e-31 0 0.500 Stable Chloroform 28-05-2015 30-10-2023 NA 0 0.500 Stable Analyte First Sample Most Recent Sample Linear Trend (ug/L/year) Mann-Kendall Statistic p-value Trend Result Dichlorobromomethane 28-05-2015 30-10-2023 NA 0 0.500 Stable Ethylbenzene 28-05-2015 30-10-2023 NA 0 0.500 Stable MEK 28-05-2015 30-10-2023 1.18e-30 0 0.500 Stable Methylene Chloride 28-05-2015 30-10-2023 NA 0 0.500 Stable Naphthalene 28-05-2015 30-10-2023 -1.18e-30 0 0.500 Stable PCE 28-05-2015 30-10-2023 5.91e-31 0 0.500 Stable TCE 28-05-2015 30-10-2023 5.91e-31 0 0.500 Stable Toluene 28-05-2015 30-10-2023 2.95e-31 0 0.500 Stable cis-1,2 DCE 28-05-2015 30-10-2023 2.95e-31 0 0.500 Stable trans-1,2 DCE 28-05-2015 30-10-2023 NA 0 0.500 Stable HIMW-5 Analyte First Sample Most Recent Sample Linear Trend (ug/L/year) Mann-Kendall Statistic p-value Trend Result 1,1 DCA 28-05-2015 30-10-2023 -0.00713 -32 0.005 Decreasing 1,1 DCE 28-05-2015 30-10-2023 -0.345 -15 0.165 Stable 1,1,1 TCA 28-05-2015 30-10-2023 -0.450 -56 <0.001 Decreasing 1,1,2 Trichloroethane 28-05-2015 30-10-2023 NA 0 0.500 Stable 1,2 DCA 28-05-2015 30-10-2023 -7.38e-31 0 0.500 Stable 1,2,3 Trichlorobenzene 28-05-2015 30-10-2023 -2.22e-30 0 0.500 Stable 1,2,4 Trimethylbenzene 28-05-2015 30-10-2023 -0.00280 -5 0.281 Stable 1,4 Dioxane 13-10-2021 30-10-2023 NA Not enough data nan not enough data Acetone 28-05-2015 30-10-2023 0.00506 3 0.386 No Trend Benzene 28-05-2015 30-10-2023 NA 0 0.500 Stable Carbon Tetrachloride 28-05-2015 30-10-2023 3.69e-31 0 0.500 Stable Analyte First Sample Most Recent Sample Linear Trend (ug/L/year) Mann-Kendall Statistic p-value Trend Result Chloroform 28-05-2015 30-10-2023 -0.00829 4 0.417 No Trend Dichlorobromomethane 28-05-2015 30-10-2023 -0.0176 -7 0.338 Stable Ethylbenzene 28-05-2015 30-10-2023 NA 0 0.500 Stable MEK 28-05-2015 30-10-2023 1.48e-30 0 0.500 Stable Methylene Chloride 28-05-2015 30-10-2023 NA 0 0.500 Stable Naphthalene 28-05-2015 30-10-2023 -1.48e-30 0 0.500 Stable PCE 28-05-2015 30-10-2023 7.38e-31 0 0.500 Stable TCE 28-05-2015 30-10-2023 -0.0137 -34 0.003 Decreasing Toluene 28-05-2015 30-10-2023 3.69e-31 0 0.500 Stable cis-1,2 DCE 28-05-2015 30-10-2023 3.69e-31 0 0.500 Stable trans-1,2 DCE 28-05-2015 30-10-2023 NA 0 0.500 Stable