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Home My WebLink AboutDERR-2025-004931 July 1, 2025 Mr. Scott Wetzel Rocky Mountain Power - Environmental Services 1407 West North Temple, Suite 110A Salt Lake City, Utah 84116 RE: Addendum to VCP Area ‘B’ Site Characterization Work Plan, Power District Redevelopment Project - VCP Area ‘B’, 1569 West North Temple Street, Salt Lake City, Utah, Facility ID No. 4002609, VCP C119 Mr. Wetzel: As requested by the Utah Department of Environmental Quality (DEQ), Division of Environmental Response and Remediation (DERR), Hill West Environmental, LLC (Hill West) has prepared this work plan addendum to document proposed additional soil characterization, to present the final proposed groundwater monitoring well locations, and to propose methane soil gas assessment for Voluntary Cleanup Program (VCP) Area ‘B’ of the RMP Power District Redevelopment Project (the Site) located at 1569 West North Temple Street, Salt Lake City, Salt Lake County, Utah (Figures 1 and 2). The DERR-approved Power District Redevelopment Project – VCP Area ‘B’ Site Characterization Work Plan (Work Plan), dated April 16, 2025 (Hill West, 2025), proposed the installation of soil borings to collect soil samples and groundwater samples from temporary wells to characterize soil and determine locations for construction of permanent groundwater monitoring wells. This letter presents the location and analyses proposed for additional soil borings to support delineation of soil contaminants above screening levels reported in soil samples collected in May 2025, and to document the final proposed groundwater monitoring well locations presented in the Work Plan (Hill West, 2025). This addendum also presents the proposed locations, methodologies, and analyses for the assessment of soil gas for methane. As presented in the Work Plan, all additional soil assessment and groundwater monitoring well installation will be completed consistent with the Power District Redevelopment Project – Sampling and Analysis & Quality Assurance Project Plan , dated August 2, 2022 (Hill West, 2022b). Mr. Scott Wetzel Project No. 2064-0034 July 1, 2025 Page 2 SCWP Addendum, 7-1-2025, Final.docx P a g e | 2 ADDITIONAL SOIL ASSESSMENT BORINGS The laboratory analytical data for the May 2025 soil assessment identified select locations where additional data would be beneficial to completing characterization and developing a Remedial Action Plan for VCP Area B. Additional soil characterization is required for lead, arsenic, cadmium, and semi-volatile organic compounds (SVOCs) at three locations (soil borings AB-21, AB-26/AB-37, and AB-32/AB-34). Soil borings will be advanced to the soil/groundwater interface near those boring locations to collect soil samples from surface soil, 5 feet below ground surface (bgs), and at the soil/groundwater interface (approximately 10 feet bgs). Soil samples collected near soil boring AB-21 will also be analyzed for oil range organics (ORO), and soil borings near soil borings AB-32/AB-34 will also be analyzed for polychlorinated biphenyls (PCBs) to provide better delineation of reported Aroclor 1260. Two (2) surface soil samples will also be collected near soil boring AB-35 to better delineate PCBs and SVOCs. Two soil borings will be advanced to the groundwater interface near soil boring AB-44 to better delineate the lead, arsenic, SVOCs, diesel range organics (DRO), and ORO reported in that area. Soil samples will be collected from surface soil, 5 feet bgs, and at the soil/groundwater interface (approximately 10 feet bgs). Two (2) soil borings will also be advanced near soil boring AB-43 to better delineate SVOCs, DRO, and ORO. Soil samples will be collected from surface soil and 5 feet bgs. The locations of the May 2025 soil borings are presented on Figure 3, and the laboratory analytical results are summarized in Tables 1, 2, and 3. The proposed soil boring locations are presented on Figure 4. Direct-push Soil Borings Sixteen (16) supplemental, direct-push, soil borings will be advanced in VCP Areas ‘B.’ During direct-push drilling activities, soil samples will be collected continuously in new plastic liners provided by the direct-push drilling contractor. Each liner will be opened, and the soil will be field screened for volatile organic compounds (VOCs) using a photoionization detector (PID). Proposed soil sample collection is presented in the following table. Prior Assessment Boring ID Number of Borings Boring Depth (feet) Sample Depths (feet) AB-21 3 10 0.167, 5, 10 (interface) AB-26 & AB-37 5 10 0.167, 5, 10 (interface) AB-32 & AB-34 4 10 0.167, 5, 10 (interface) AB-35 grab samples (2) Surface 0.167 AB-43 2 5 0.167 and 5 AB-44 2 10 0.167, 5, 10 (interface) Mr. Scott Wetzel Project No. 2064-0034 July 1, 2025 Page 3 SCWP Addendum, 7-1-2025, Final.docx P a g e | 3 A field log will be prepared for each direct-push boring and will include the project name and location, soil sample depths, drilling characteristics, and descriptions of the soil encountered. Subsurface lithology will be described consistent with ASTM International (ASTM) D2488-84, Standard Practice for Description and Identification of Soils (Visual-Manual Procedures). The direct-push sampling barrel will be decontaminated between each direct-push boring in accordance with the drilling contactor’s standard procedures. All fluids generated during decontamination procedures will be containerized in United States Department of Transportation (DOT)-approved 55-gallon drums pending characterization and appropriate disposal. Laboratory Analyses All soil samples will be submitted under standard chain-of-custody (COC) procedure to ChemTech-Ford Laboratories, Inc. (ChemTech) in Sandy, Utah, or another Utah accredited laboratory, for analyses. Soil samples for RCRA metals arsenic, barium, cadmium, chromium, lead, selenium, and silver analysis will be analyzed by USEPA Methods 6010B and 6020B, for mercury by USEPA Method 7471, and for cyanide by Standard Method SM4500CN. Soil samples for SVOCs analysis will be analyzed by USEPA Method 8270SIM, for PCBs by USEPA Method 8082, and for GRO, DRO, and ORO by USEPA Method 8015. PROPOSED GROUNDWATER MONITORING WELLS As proposed in the Work Plan (Hill West, 2025), the final number and locations of monitoring wells has been determined following an evaluation of groundwater quality data (Table 4) collected from the temporary well points in the direct-push borings in May 2025. Ten (10) groundwater monitoring wells will be installed as presented on Figure 5 to further assess groundwater quality and groundwater flow direction and gradient. Groundwater monitoring well installation, construction, development, surveying, and sampling will be completed consistent with that presented in Section 3.4 of the Work Plan (Hill West, 2025). SOIL GAS ASSESSMENT The additional characterization will include soil gas sampling at four (4) locations within VCP Area ‘B’ (Figure 6) to assess for the presence of methane that may potentially be present from historical landfill operations in the area. At each sub-slab soil gas sampling location, a 1-inch diameter hole will be bored through the asphalt or concrete, a decontaminated soil gas drive point will be advanced to a depth of 3-feet bgs, sealed, and allowed to equilibrate for a minimum of two hours prior to purging. Prior to sampling, polyethylene tubing will be connected to each drive point and the drive point will be purged with a minimum of three drive point casing volumes with an air Mr. Scott Wetzel Project No. 2064-0034 July 1, 2025 Page 4 SCWP Addendum, 7-1-2025, Final.docx P a g e | 4 sampling pump calibrated for a flow rate of 200 milliliters per minute (ml/min). Purge pump identification numbers, calibrated flow rates, and purge volumes will be recorded on soil gas field sampling data sheets (FSDSs). Following purging, a laboratory provided 1-liter or 6-liter Summa™ canister will be connected to the drive point utilizing disposable polyethylene tubing for sample collection. Laboratory Analyses All soil gas samples will be collected with laboratory provided 1-liter or 6-liter Summa TM canisters, labeled, and shipped using COC procedures to a Utah accredited analytical laboratory. All samples will be analyzed for methane by ASTM Method D1945-14. SCHEDULE The soil borings for additional soil characterization and groundwater monitoring well installation are scheduled for completion the week of June 30, 2025. Groundwater monitoring well development and sampling, and soil gas assessment are scheduled to occur the week of July 7, 2025. If you have any questions, please do not hesitate to contact Claude Dahlk at 801-450-8060 Sincerely, Daniel Landry Senior Scientist A&M Engineering and Environmental Services, Inc. Claude Dahlk, CHMM Project Manager Hill West Environmental, LLC Attachments: References Tables Figures REFERENCES Hill West, 2025. Power District Redevelopment Project – VCP Area ‘B’ Site Characterization Work Plan, 1569 West North Temple Street, Salt Lake City, Utah – Hill West, April 16. Hill West, 2022b. Power District Redevelopment Project – Sampling and Analysis & Quality Assurance Project Plan, 1223 West North Temple Street, Salt Lake City, Utah, VCP ID No. VCP-C119 - Hill West, August 2. TABLES Table 1 Summary of Soil Analytical Results - RCRA Metals and Cyanide Mercury Cyanide USEPA Method 7471 Method SM4500CN (mg/kg)(mg/kg) Boring ID Sample ID Sample Depth (ft bgs) Date Sampled Ar s e n i c Ba r i u m Ca d m i u m Ch r o m i u m Le a d Se l e n i u m Si l v e r Me r c u r y Cy a n i d e AB-21 @ 0-2'' BGS 0.0 - 0.167 05/19/25 12.3 149 0.780 J 15.6 96.3 0.824 0.196 J 0.181 0.145 AB-21 Dup @ 0-2'' BGS 0.0 - 0.167 05/19/25 10.6 72.1 0.579 J 12.5 52.2 <0.703 <0.176 0.488 0.114 AB-21 @ 4-5' BGS 4 - 5 05/19/25 113 170 120 14.7 2,100 2.00 1.09 J 1.06 0.811 AB-21 @ 9-11' BGS 9 - 11 05/19/25 8.91 79.8 0.477 J 16.9 38.0 <0.690 <0.173 0.086 0.136 AB-22 @ 0-2" BGS 0.0 - 0.167 05/19/25 13.1 253 0.723 J 29.8 42.6 <1.13 0.427 J 0.030 J 0.092 AB-22 @ 4-5' BGS 4 - 5 05/19/25 17.6 362 0.262 J 26.2 41.1 <1.04 0.368 J 0.022 J 0.088 AB-22 @ 8-9' BGS 8 - 9 05/19/25 14.9 105 0.168 J 15.3 18.0 <0.701 0.256 J 0.018 J 0.073 J AB-23 @ 0-2'' BGS 0.0 - 0.167 05/19/25 30.9 274 4.24 23.2 249 <0.930 0.616 J 0.199 0.262 AB-23 @ 4-5' BGS 4 - 5 05/19/25 12.0 192 0.265 J 21.9 28.2 <1.14 0.349 J 0.026 J 0.090 AB-23 @ 7' BGS 7 05/19/25 6.68 76.5 0.348 J 16.2 21.8 1.46 0.291 J 0.020 J 0.076 AB-24 @ 0-2'' BGS 0.0 - 0.167 05/19/25 4.12 60.6 0.439 J 12.5 17.9 1.89 <0.222 0.016 J <0.047 AB-24 @ 4-5' BGS 4 - 5 05/19/25 13.5 147 1.86 16.9 111 2.23 <0.263 0.071 0.151 AB-24 Dup @ 4-5' BGS 4 - 5 05/19/25 9.05 168 0.750 J 19.9 25.0 2.79 <0.245 0.029 J 0.088 AB-24 @ 8' BGS 8 05/19/25 7.62 90.1 0.305 J 12.6 16.2 1.06 J <0.254 0.009 J 0.080 AB-25 @ 0-2'' BGS 0.0 - 0.167 05/19/25 9.65 114 0.497 J 13.6 32.1 1.33 <0.281 0.048 0.144 AB-25 @ 4-5' BGS 4 - 5 05/19/25 12.4 116 0.307 J 12.8 71.0 1.29 <0.197 0.019 J 0.105 AB-25 @ 7' BGS 7 05/19/25 11.3 40.2 <0.115 6.92 43.2 1.01 J <0.232 0.015 J 0.087 AB-26 @ 0-2'' 0.0 - 0.167 05/19/25 356 1,700 23.3 86.4 11,900 17.2 9.42 0.028 0.065 AB-26 @ 4-5' BGS 4 - 5 05/19/25 8.01 140 0.665 J 15.4 52.4 2.64 0.261 J 0.277 0.130 AB-26 @ 8' BGS 8 05/19/25 11.2 182 0.888 J 26.6 56.8 3.33 0.335 J 0.042 0.091 AB-27 @ 0-2'' BGS 0.0 - 0.167 05/19/25 17.9 131 1.62 16.3 57.2 <0.959 0.248 J 0.044 <0.052 AB-27 @ 4-5' BGS 4 - 5 05/19/25 28.0 122 0.239 J 14.8 20.5 <0.680 <0.171 0.024 J 0.113 AB-27 @ 7' BGS 7 05/19/25 1.64 113 0.208 J 11.9 14.0 <0.658 0.172 J 0.023 J 0.081 AB-28 @ 0-2'' BGS 0.0 - 0.167 05/19/25 15.7 180 1.57 22.5 84.1 <0.935 0.480 J 3.21 0.183 AB-28 @ 4-5' BGS 4 - 5 05/19/25 75.9 221 0.206 J 29.2 51.9 <0.902 0.276 J 0.024 J 0.317 AB-28 @ 7' BGS 7 05/19/25 5.23 67.5 0.177 J 8.39 8.51 <0.873 <0.220 0.010 J 0.070 J AB-28 Dup @ 7' BGS 7 05/19/25 9.44 72.7 0.171 J 11.3 10.9 <0.711 <0.178 0.008 J 0.153 AB-29 @ 0-2'' BGS 0.0 - 0.167 05/19/25 14.2 124 0.766 J 14.6 37.3 1.14 <0.214 0.062 0.081 AB-29 @ 4-5' BGS 4 - 5 05/19/25 10.0 267 0.433 J 26.5 43.0 <0.974 0.308 J 0.032 J 0.121 AB-29 @ 8' BGS 8 05/19/25 4.20 32.0 <0.117 7.18 4.20 <0.945 <0.237 0.008 J 0.116 AB-28 AB-29 AB-24 AB-25 AB-26 AB-27 AB-21 AB-22 AB-23 RCRA Metals USEPA Methods 6010B and 6020B (mg/kg) Soil Analytical Summary Table - metals, rev3.xlsx, Table 1 Page 1 of 3 Power District Redevelopment Project VCP Area B 1569 West North Temple Street Salt Lake City, Utah Table 1 Summary of Soil Analytical Results - RCRA Metals and Cyanide Mercury Cyanide USEPA Method 7471 Method SM4500CN (mg/kg)(mg/kg) Boring ID Sample ID Sample Depth (ft bgs) Date Sampled Ar s e n i c Ba r i u m Ca d m i u m Ch r o m i u m Le a d Se l e n i u m Si l v e r Me r c u r y Cy a n i d e RCRA Metals USEPA Methods 6010B and 6020B (mg/kg) AB-30 @ 0-2'' BGS 0.0 - 0.167 05/20/25 28.3 157 1.21 15.7 79.3 2.34 0.395 J 0.139 0.064 J AB-30 Dup @ 0-2' BGS 0.0 - 0.167 05/20/25 10.7 137 0.689 J 15.3 26.5 2.09 0.263 J 0.029 <0.052 AB-30 @ 4-5' BGS 4 - 5 05/20/25 10.5 142 1.11 J 14.9 77.6 2.23 <0.288 0.048 0.108 AB-30 @ 8' BGS 8 05/20/25 0.955 J 44.1 <0.117 4.78 3.84 <0.939 <0.236 0.112 <0.054 AB-31 @ 0-2'' BGS 0.0 - 0.167 05/20/25 6.65 118 0.956 J 16.2 124 2.52 0.290 J <0.007 <0.047 AB-31 @ 4-5' BGS 4 - 5 05/20/25 11.4 288 0.515 J 23.5 34.2 3.41 <0.297 0.021 J <0.057 AB-31 Dup @ 4-5' BGS 4 - 5 05/20/25 5.74 66.8 0.223 J 10.4 9.06 1.75 <0.233 0.010 J <0.053 AB-31 @ 7' BGS 7 05/20/25 1.61 28.5 <0.120 5.60 3.24 1.31 <0.243 <0.005 <0.051 AB-32 @ 0-2'' BGS 0.0 - 0.167 05/20/25 24.6 83.0 6.40 16.5 532 1.47 0.652 J 0.163 0.157 AB-32 @ 4-5' BGS 4 - 5 05/20/25 4.05 128 0.749 J 13.5 21.2 2.34 0.218 J 0.029 <0.053 AB-32 @ 7' BGS 7 05/20/25 4.85 42.5 <0.131 9.55 10.1 1.56 <0.264 0.006 J <0.052 AB-33 @ 0-2'' BGS 0.0 - 0.167 05/20/25 17.4 117 2.11 13.9 91.5 2.18 0.320 J 0.617 0.124 AB-33 @ 4-5' BGS 4 - 5 05/20/25 9.91 255 0.726 J 28.8 46.2 4.00 0.373 J 0.030 <0.055 AB-33 @ 7' BGS 7 05/20/25 2.49 40.6 <0.116 5.55 6.01 <0.932 <0.234 0.004 J <0.052 AB-34 @ 0-2'' BGS 0.0 - 0.167 05/20/25 34.0 131 19.2 21.2 319 2.58 0.733 J 0.236 0.137 AB-34 @ 4-5' BGS 4 - 5 05/20/25 40.4 363 5.09 18.1 1,350 2.88 0.986 0.583 0.123 AB-34 @ 7.5 BGS 7.5 05/20/25 1.69 13.8 <0.082 3.06 3.84 <0.658 <0.165 0.016 J <0.050 AB-35 @ 0-2'' BGS 0.0 - 0.167 05/20/25 36.3 146 3.80 23.1 228 3.00 0.579 J 0.117 0.096 AB-35 @ 4-5' BGS 4 - 5 05/20/25 5.89 91.3 0.387 J 13.2 17.1 2.33 <0.180 0.425 0.103 AB-35 @ 7' BGS 7 05/20/25 3.21 94.6 <0.085 6.91 7.83 1.06 <0.171 0.010 J <0.053 AB-35 @ 7' BGS DUP 7 05/20/25 3.73 107 0.133 J 9.53 19.4 1.22 0.198 J <0.007 <0.053 AB-36 @ 0-2'' BGS 0.0 - 0.167 05/21/25 5.66 54.1 0.134 3.86 11.6 0.525 0.047 J 0.069 <0.054 AB-36 @ 4-5' BGS 4 - 5 05/21/25 25.7 143 2.70 15.0 121 2.36 0.281 J 0.117 0.091 AB-36 @ 7.5 BGS 7.5 05/21/25 5.10 298 0.313 J 21.3 35.2 2.93 0.378 J 0.055 <0.061 AB-37 @ 0-2'' BGS 0.0 - 0.167 05/21/25 8.55 62.9 0.211 11.9 65.9 1.12 0.164 J 0.015 J <0.053 AB-37 @ 4-5' BGS 4 - 5 05/21/25 42.9 434 2.04 20.6 1,150 4.58 3.40 0.037 0.067 J AB-37 @ 7' BGS 7 05/21/25 4.62 43.8 <0.059 8.14 7.38 1.29 0.123 J 0.015 J <0.053 AB-38 @ 0-2'' BGS 0.0 - 0.167 05/21/25 8.84 213 0.402 J 20.4 66.5 2.80 0.309 J 0.107 0.101 AB-38 @ 4-5' BGS 4 - 5 05/21/25 16.8 163 0.409 J 8.98 131 1.31 0.173 J 0.079 <0.056 AB-38 @ 7.5 BGS 7.5 05/21/25 29.3 139 0.123 J 11.9 19.9 1.53 <0.108 0.035 <0.053 AB-35 AB-36 AB-37 AB-38 AB-32 AB-33 AB-34 AB-31 AB-30 Soil Analytical Summary Table - metals, rev3.xlsx, Table 1 Page 2 of 3 Power District Redevelopment Project VCP Area B 1569 West North Temple Street Salt Lake City, Utah Table 1 Summary of Soil Analytical Results - RCRA Metals and Cyanide Mercury Cyanide USEPA Method 7471 Method SM4500CN (mg/kg)(mg/kg) Boring ID Sample ID Sample Depth (ft bgs) Date Sampled Ar s e n i c Ba r i u m Ca d m i u m Ch r o m i u m Le a d Se l e n i u m Si l v e r Me r c u r y Cy a n i d e RCRA Metals USEPA Methods 6010B and 6020B (mg/kg) AB-39 @ 0-2'' BGS 0.0 - 0.167 05/21/25 11.3 196 0.667 24.8 147 3.81 0.603 0.032 J <0.056 AB-39 @ 4-5' BGS 4 - 5 05/21/25 9.09 173 0.199 J 23.6 39.0 3.25 0.286 J 0.030 J 0.073 J AB-39 @ 7' BGS 7 05/21/25 12.7 74.0 0.473 J 11.6 19.8 1.62 <0.184 0.016 J <0.052 AB-40 @ 0-2'' BGS 0.0 - 0.167 05/21/25 8.10 101 0.756 14.6 126 2.77 0.439 J 0.021 J <0.049 AB-40 @ 4-5' BGS 4 - 5 05/21/25 12.1 254 0.350 J 23.0 69.5 2.86 0.215 J 0.023 J 0.099 AB-40 @ 8' BGS 8 05/21/25 1.33 59.6 <0.090 4.50 4.95 <0.726 <0.182 <0.090 0.053 J AB-41 @ 0-2'' BGS 0.0 - 0.167 05/21/25 7.03 116 0.540 J 15.6 31.1 3.93 0.169 J 0.208 <0.050 AB-41 @ 4-5' BGS 4 - 5 05/21/25 10.1 99.5 1.13 20.7 63.8 1.42 0.343 J 0.055 0.080 AB-42 @ 0-2'' BGS 0.0 - 0.167 05/20/25 4.02 54.1 0.240 J 8.05 12.3 1.43 <0.133 0.085 <0.043 AB-42 @ 4-5' BGS 4 - 5 05/20/25 15.6 152 1.06 17.6 93.5 2.39 0.325 J 0.057 0.128 AB-42 Dup @ 4-5' BGS 4 - 5 05/20/25 15.1 166 0.851 19.4 54.4 2.73 0.334 J 0.055 0.096 AB-42 @ 7' BGS 7 05/20/25 0.904 14.6 0.060 J 1.70 1.96 0.274 0.020 J 0.010 J <0.052 AB-43 @ 0-2'' BGS 0.0 - 0.167 05/20/25 0.823 4.57 0.040 J 1.17 0.960 0.177 <0.021 0.014 J <0.042 AB-43 @ 4-5' BGS 4 - 5 05/20/25 7.08 86.6 0.599 4.52 156 0.713 0.243 0.523 0.140 AB-43 @ 8.5 BGS 8.5 05/20/25 0.985 17.5 0.055 J 2.41 2.92 0.330 0.031 J 0.010 J <0.056 AB-44 @ 0-2'' BGS 0.0 - 0.167 05/20/25 0.668 4.70 0.037 J 1.24 0.947 0.169 <0.018 0.020 J 0.296 AB-44 @ 4-5' BGS 4 - 5 05/20/25 14.0 244 1.39 15.7 330 2.20 0.551 0.824 0.103 AB-44 @ 8' BGS 8 05/20/25 3.40 273 1.24 20.0 29.3 2.93 0.319 J 0.025 J <0.061 USEPA RSL - Residential Soil 0.68 15,000 7.1 120,000 200 390 390 11 23 USEPA RSL - Commercial Soil 3.0 220,000 100 1,800,000 800 5,800 5,800 46 150 VCP Area 'A' Site-specific Cleanup Goal 14 a NE NE NE NE NE NE NE NE Notes: USEPA - United States Environmental Protection Agency NE - Not established mg/kg - Milligrams per kilogram ft bgs - Feet below ground surface J - Detected but below the Reporting Limit. Therefore, result is an estimated concentration. < - Not reported at, or above, the indicated laboratory method reporting limit Shaded value was reported above the laboratory reporting limit Bold Values - Reported concentration exceeds USEPA Residential RSL Bold Underlined Values - Reported concentration exceeds USEPA Residential and Industrial Soil RSL Bold Red Values - Reported concentration exceeds VCP Area A-Specific Cleanup Goal RSL - Regional Screening Level, value provided in the RSL Summary Table, dated November 2024 The samples collected from borings NTO-9 and NTO-10 were composited by the laboratory. a - VCP Area A-specific cleanup goal AB-43 AB-44 AB-39 AB-40 AB-41 AB-42 Soil Analytical Summary Table - metals, rev3.xlsx, Table 1 Page 3 of 3 Power District Redevelopment Project VCP Area B 1569 West North Temple Street Salt Lake City, Utah Table 2 Summary of Soil Analytical Results - VOCs, GRO, DRO, ORO, and PCBs Boring ID Sample ID Sample Depth (ft bgs) Date Sampled 1, 2 , 4 - T r i m e t h y l b e n z e n e Ac e t o n e Be n z e n e Ca r b o n D i s u l f i d e Et h y l b e n z e n e Me t h y l E t h y l K e t o n e (M E K ) Me t h y l I s o b u t y l K e t o n e (M I K ) Me t h y l e n e C h l o r i d e n -B u t y l A l c o h o l To l u e n e Xy l e n e s , T o t a l Ga s o l i n e R a n g e Or g a n i c s ( G R O ) Di e s e l R a n g e O r g a n i c s (D R O ) Oi l R a n g e O r g a n i c s (O R O ) Ar o c l o r 1 2 6 0 Al l O t h e r Po l y c h l o r i n a t e d Bi p h e n y l s ( P C B s ) AB-21 @ 0-2'' BGS 0.0 - 0.167 05/19/25 <0.0004 0.009 J <0.0003 <0.0005 <0.0003 <0.001 <0.001 <0.0009 <0.008 0.0007 J <0.0009 <0.02 <10 <85 <0.08 ND AB-21 Dup @ 0-2'' BGS 0.0 - 0.167 05/19/25 <0.0004 0.04 J <0.0003 <0.0005 <0.0004 <0.001 <0.001 <0.0009 <0.009 <0.0005 <0.0009 <0.02 <10 <86 <0.08 ND AB-21 @ 4-5' BGS 4 - 5 05/19/25 <0.0005 0.24 J <0.0004 0.001 J <0.0003 0.04 J <0.001 <0.001 <0.01 0.0006 J <0.001 <0.03 <12 <104 <0.1 ND AB-21 @ 9-11' BGS 9 - 11 05/19/25 0.002 <0.009 0.001 0.0007 J 0.001 <0.001 0.001 J <0.001 <0.009 0.007 0.008 0.03 322 749 <0.09 ND AB-22 @ 0-2" BGS 0.0 - 0.167 05/19/25 <0.0005 0.03 J <0.0004 0.001 J <0.0003 <0.001 <0.001 <0.001 <0.01 0.001 0.001 J <0.03 <12 <101 <0.09 ND AB-22 @ 4-5' BGS 4 - 5 05/19/25 <0.0005 0.02 J <0.0004 0.001 J <0.0003 <0.001 <0.001 <0.001 <0.01 0.0008 J <0.001 <0.03 <12 <102 <0.1 ND AB-22 @ 8-9' BGS 8 - 9 05/19/25 <0.0005 <0.01 <0.0004 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 0.0006 J <0.001 <0.03 <11 <98 <0.09 ND AB-23 @ 0-2'' BGS 0.0 - 0.167 05/19/25 <0.0005 0.07 J <0.0004 <0.0006 <0.0003 0.002 J <0.001 <0.001 <0.01 <0.0005 <0.001 <0.03 <11 <99 <0.09 ND AB-23 @ 4-5' BGS 4 - 5 05/19/25 <0.0005 <0.01 <0.0004 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 <0.0006 <0.001 <0.03 <12 <106 <0.1 ND AB-23 @ 7' BGS 7 05/19/25 <0.0005 <0.01 <0.0004 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 0.002 0.001 J <0.03 <11 <98 <0.09 ND AB-24 @ 0-2'' BGS 0.0 - 0.167 05/19/25 0.0005 J <0.009 <0.0003 <0.0005 <0.0003 <0.001 <0.001 <0.001 <0.009 0.002 0.001 J 0.02 <10 <89 <0.08 ND AB-24 @ 4-5' BGS 4 - 5 05/19/25 <0.0005 0.06 <0.0004 0.0008 J <0.0003 <0.001 <0.001 <0.001 <0.01 0.001 0.001 J <0.03 <11 <99 <0.09 ND AB-24 Dup @ 4-5' BGS 4 - 5 05/19/25 0.0007 J 0.06 0.0006 0.0007 J <0.0003 <0.001 <0.001 <0.001 <0.009 0.003 0.003 J 0.02 <11 <95 <0.09 ND AB-24 @ 8' BGS 8 05/19/25 <0.0005 <0.01 <0.0003 <0.0006 <0.0003 <0.001 <0.001 <0.001 0.01 J 0.0009 J <0.001 <0.03 <11 <97 <0.09 ND AB-25 @ 0-2'' BGS 0.0 - 0.167 05/19/25 0.001 <0.01 <0.0004 0.0006 J 0.0005 J <0.001 <0.001 <0.001 <0.01 0.004 0.005 <0.03 <11 <98 <0.09 ND AB-25 @ 4-5' BGS 4 - 5 05/19/25 0.0006 J <0.009 <0.0003 <0.0005 <0.0003 <0.001 <0.001 <0.001 <0.009 0.002 0.003 <0.02 <11 <93 <0.09 ND AB-25 @ 7' BGS 7 05/19/25 0.0005 J <0.01 <0.0003 <0.0006 <0.0003 <0.001 <0.001 <0.001 0.01 J 0.001 0.002 J <0.02 <11 <96 <0.09 ND AB-26 @ 0-2'' BGS 0.0 - 0.167 05/19/25 <0.0004 <0.008 <0.0003 <0.0005 <0.0003 <0.0009 <0.0009 <0.0009 <0.008 0.002 0.0008 J <0.02 71 219 J <0.08 ND AB-26 @ 4-5' BGS 4 - 5 05/19/25 <0.0005 0.03 <0.0003 0.001 J <0.0003 <0.001 0.003 J <0.001 0.01 J 0.001 0.001 J <0.03 <11 <97 <0.09 ND AB-26 @ 8' BGS 8 05/19/25 0.0008 J <0.01 <0.0004 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 0.002 0.003 J <0.03 <12 <109 <0.1 ND AB-27 @ 0-2'' BGS 0.0 - 0.167 05/19/25 <0.0005 0.03 <0.0003 0.0009 J <0.0003 <0.001 <0.001 <0.001 <0.009 0.0007 J <0.0009 <0.02 120 <90 <0.08 ND AB-27 @ 4-5' BGS 4 - 5 05/19/25 <0.0005 <0.009 <0.0003 <0.0005 <0.0003 <0.001 <0.001 <0.001 <0.009 0.001 0.0009 J <0.02 <10 <91 <0.08 ND AB-27 @ 7' BGS 7 05/19/25 <0.0005 <0.01 <0.0003 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.009 0.0006 J <0.001 <0.02 <11 <95 <0.09 ND AB-28 @ 0-2'' BGS 0.0 - 0.167 05/19/25 0.001 <0.01 0.0007 0.0007 J 0.0006 J <0.001 <0.001 <0.001 <0.01 0.004 0.005 <0.03 <11 <100 <0.09 ND AB-28 @ 4-5' BGS 4 - 5 05/19/25 <0.0005 <0.01 <0.0004 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 0.0009 J 0.001 J <0.03 <12 <102 <0.1 ND AB-28 @ 7' BGS 7 05/19/25 <0.0005 <0.009 <0.0003 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.009 0.0008 J <0.001 <0.02 <11 <94 <0.09 ND AB-28 Dup @ 7' BGS 7 05/19/25 <0.0005 <0.01 <0.0004 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 0.0008 J <0.001 <0.03 <11 <97 <0.09 ND AB-29 @ 0-2'' BGS 0.0 - 0.167 05/19/25 <0.0005 <0.009 <0.0003 <0.0007 J <0.0003 <0.001 <0.001 <0.001 <0.009 0.0009 J <0.0009 <0.02 <10 <88 <0.08 ND AB-29 @ 4-5' BGS 4 - 5 05/19/25 <0.0005 0.04 <0.0004 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 0.001 0.002 J <0.03 <12 <101 <0.09 ND AB-29 @ 8' BGS 8 05/19/25 <0.0005 <0.01 <0.0003 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 0.0006 J <0.001 <0.03 <11 <98 <0.09 ND AB-30 @ 0-2'' BGS 0.0 - 0.167 05/20/25 <0.0005 0.02 0.002 0.0009 J <0.0003 <0.001 <0.001 0.001 B 0.01 J 0.006 0.003 J 0.03 <11 <96 <0.09 ND AB-30 Dup @ 0-2' BGS 0.0 - 0.167 05/20/25 <0.0005 0.03 <0.0004 0.0008 J <0.0003 <0.001 <0.001 <0.001 0.01 J 0.0006 J <0.001 <0.03 <11 <97 <0.09 ND AB-30 @ 4-5' BGS 4 - 5 05/20/25 <0.0005 0.05 0.002 0.0007 J <0.0003 <0.001 <0.001 0.001 B <0.009 0.005 0.003 J 0.02 <11 <96 <0.09 ND AB-30 @ 8' BGS 8 05/20/25 <0.0005 <0.01 0.0008 <0.0006 <0.0003 <0.001 <0.001 0.001 B 0.02 J 0.002 0.001 J <0.03 <11 <96 <0.09 ND PCBs USEPA Method 8082 (mg/kg) AB-26 AB-27 AB-28 AB-29 AB-30 AB-21 AB-22 AB-23 AB-24 AB-25 Petroleum Hydrocarbons USEPA Method 8015 (mg/kg) Volatile Organic Compounds (VOCs) USEPA Method 8260B (mg/kg) Soil Analytical Summary Table - VOCs, GRO, DRO, etc, rev3.xlsx, Table 2 Page 1 of 3 Power District Redevelopment Project VCP Area B 1569 West North Temple Street Salt Lake City, Utah Table 2 Summary of Soil Analytical Results - VOCs, GRO, DRO, ORO, and PCBs Boring ID Sample ID Sample Depth (ft bgs) Date Sampled 1, 2 , 4 - T r i m e t h y l b e n z e n e Ac e t o n e Be n z e n e Ca r b o n D i s u l f i d e Et h y l b e n z e n e Me t h y l E t h y l K e t o n e (M E K ) Me t h y l I s o b u t y l K e t o n e (M I K ) Me t h y l e n e C h l o r i d e n -B u t y l A l c o h o l To l u e n e Xy l e n e s , T o t a l Ga s o l i n e R a n g e Or g a n i c s ( G R O ) Di e s e l R a n g e O r g a n i c s (D R O ) Oi l R a n g e O r g a n i c s (O R O ) Ar o c l o r 1 2 6 0 Al l O t h e r Po l y c h l o r i n a t e d Bi p h e n y l s ( P C B s ) PCBs USEPA Method 8082 (mg/kg) Petroleum Hydrocarbons USEPA Method 8015 (mg/kg) Volatile Organic Compounds (VOCs) USEPA Method 8260B (mg/kg) AB-31 @ 0-2'' BGS 0.0 - 0.167 05/20/25 0.001 0.03 0.003 0.0009 J 0.001 <0.001 <0.001 0.001 B <0.009 0.01 0.009 0.04 <10 <89 <0.08 ND AB-31 @ 4-5' BGS 4 - 5 05/20/25 0.002 <0.01 0.004 <0.0006 0.001 <0.001 <0.001 0.001 B <0.01 0.01 0.01 0.04 <12 <106 <0.1 ND AB-31 Dup @ 4-5' BGS 4 - 5 05/20/25 0.001 <0.01 0.002 <0.0006 0.0007 J <0.001 <0.001 <0.001 <0.009 0.007 0.006 0.03 <11 <96 <0.09 ND AB-31 @ 7' BGS 7 05/20/25 0.0009 J <0.01 0.002 <0.0006 0.0006 J <0.001 <0.001 0.002 B <0.01 0.008 0.005 0.03 <11 <97 <0.09 ND AB-32 @ 0-2'' BGS 0.0 - 0.167 05/20/25 0.0007 J 0.02 0.001 0.002 <0.0003 <0.001 <0.001 0.001 B <0.008 0.004 0.003 0.02 61 <85 <0.08 ND AB-32 @ 4-5' BGS 4 - 5 05/20/25 0.001 0.02 J 0.003 0.002 J 0.001 <0.001 <0.001 0.001 B <0.01 0.01 0.009 0.04 <11 <96 <0.09 ND AB-32 @ 7' BGS 7 05/20/25 0.0005 J <0.01 0.002 <0.0006 <0.0003 <0.001 <0.001 0.001 B <0.009 0.005 0.003 J 0.02 <11 <95 <0.09 ND AB-33 @ 0-2'' BGS 0.0 - 0.167 05/20/25 <0.0004 0.04 <0.0003 <0.0005 <0.0003 <0.001 <0.001 <0.0009 <0.009 0.002 0.002 J <0.02 <10 <87 <0.08 ND AB-33 @ 4-5' BGS 4 - 5 05/20/25 0.0005 J <0.01 0.0009 <0.0006 0.0005 J <0.001 <0.001 <0.001 <0.01 0.004 0.003 J <0.03 <11 <100 <0.09 ND AB-33 @ 7' BGS 7 05/20/25 0.0007 J <0.009 <0.0003 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.009 0.002 0.003 J <0.02 73 346 J <0.09 ND AB-34 @ 0-2'' BGS 0.0 - 0.167 05/20/25 0.0005 J 0.13 0.0006 0.001 J <0.0003 0.01 J <0.001 <0.001 <0.009 0.002 0.002 J 0.02 155 373 J 0.9 ND AB-34 @ 4-5' BGS 4 - 5 05/20/25 <0.0008 <0.02 <0.0006 <0.001 <0.0005 <0.002 <0.002 <0.002 <0.02 0.003 0.002 J <0.04 <12 <104 <0.1 ND AB-34 @ 7.5 BGS 7.5 05/20/25 0.0005 J <0.008 <0.0003 <0.0005 <0.0003 <0.001 <0.001 <0.0009 <0.008 0.0007 J 0.001 J <0.02 <10 <88 <0.08 ND AB-35 @ 0-2'' BGS 0.0 - 0.167 05/20/25 <0.0005 <0.009 0.0008 0.0008 J <0.0003 <0.001 <0.001 <0.001 <0.009 0.003 0.002 J <0.02 89 218 J 0.3 ND AB-35 @ 4-5' BGS 4 - 5 05/20/25 0.0008 J 0.09 <0.0003 0.002 J 0.0006 J 0.002 J <0.001 <0.001 <0.009 0.003 0.004 <0.03 <11 <95 <0.09 ND AB-35 @ 7' BGS 7 05/20/25 0.0005 J <0.01 <0.0003 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.009 0.001 0.001 J <0.02 <11 <94 <0.09 ND AB-35 @ 7' BGS DUP 7 05/20/25 <0.0005 <0.01 <0.0003 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 0.0006 J <0.001 <0.03 116 408 J <0.09 ND AB-36 @ 0-2'' BGS 0.0 - 0.167 05/21/25 0.0005 J 0.03 0.0005 0.0006 J <0.0003 0.004 J <0.001 <0.001 <0.01 0.002 0.002 J <0.03 <11 <98 <0.09 ND AB-36 @ 4-5' BGS 4 - 5 05/21/25 0.0007 J <0.01 <0.0004 <0.0007 <0.0004 <0.001 <0.001 <0.001 <0.01 0.003 0.004 <0.03 118 399 J <0.09 ND AB-36 @ 7.5 BGS 7.5 05/21/25 <0.0007 <0.01 <0.0005 <0.0008 <0.0004 <0.002 <0.001 <0.001 <0.01 0.001 J 0.002 J <0.03 104 363 J <0.1 ND AB-37 @ 0-2'' BGS 0.0 - 0.167 05/21/25 <0.0005 <0.01 <0.0004 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 <0.0005 <0.001 <0.03 145 468 J <0.09 ND AB-37 @ 4-5' BGS 4 - 5 05/21/25 <0.0006 <0.01 <0.0004 <0.0007 <0.0004 <0.001 <0.001 <0.001 <0.01 0.0009 J 0.001 J <0.03 <12 <103 <0.1 ND AB-37 @ 7' BGS 7 05/21/25 <0.0005 <0.01 <0.0004 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 <0.0006 <0.001 <0.03 <11 <95 <0.09 ND AB-38 @ 0-2'' BGS 0.0 - 0.167 05/21/25 <0.0005 <0.01 <0.0004 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 0.002 <0.001 <0.03 <11 <100 <0.09 ND AB-38 @ 4-5' BGS 4 - 5 05/21/25 <0.0006 <0.01 <0.0004 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 0.0007 J <0.001 <0.03 <11 <99 <0.09 ND AB-38 @ 7.5 BGS 7.5 05/21/25 <0.0006 <0.01 <0.0004 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 <0.0006 <0.001 <0.03 <11 <94 <0.09 ND AB-39 @ 0-2'' BGS 0.0 - 0.167 05/21/25 <0.0005 <0.01 <0.0003 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.009 0.003 0.003 J <0.02 <11 <98 <0.09 ND AB-39 @ 4-5' BGS 4 - 5 05/21/25 0.001 <0.01 <0.0004 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 0.0009 J 0.002 J <0.03 <11 <100 <0.09 ND AB-39 @ 7' BGS 7 05/21/25 <0.0005 <0.01 <0.0004 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 <0.0006 <0.001 <0.03 <11 <96 <0.09 ND AB-40 @ 0-2'' BGS 0.0 - 0.167 05/21/25 <0.0005 <0.01 <0.0003 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.009 0.0008 J 0.001 J <0.02 <10 <89 <0.08 ND AB-40 @ 4-5' BGS 4 - 5 05/21/25 0.0007 J <0.01 <0.0003 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.009 0.0009 J 0.002 J <0.02 <11 <96 <0.09 ND AB-40 @ 8' BGS 8 05/21/25 <0.0005 <0.01 <0.0004 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 <0.0005 <0.001 <0.03 <10 <92 <0.09 ND AB-41 @ 0-2'' BGS 0.0 - 0.167 05/21/25 <0.0005 <0.009 <0.0003 <0.0005 <0.0003 <0.001 <0.001 <0.001 <0.009 0.0006 J <0.0009 <0.02 105 271 J <0.08 ND AB-41 @ 4-5' BGS 4 - 5 05/21/25 <0.0006 0.03 <0.0004 0.002 J <0.0004 <0.001 <0.001 0.001 J <0.01 0.002 <0.001 <0.03 <11 <100 <0.09 ND AB-41 AB-31 AB-32 AB-33 AB-34 AB-35 AB-36 AB-37 AB-38 AB-39 AB-40 Soil Analytical Summary Table - VOCs, GRO, DRO, etc, rev3.xlsx, Table 2 Page 2 of 3 Power District Redevelopment Project VCP Area B 1569 West North Temple Street Salt Lake City, Utah Table 2 Summary of Soil Analytical Results - VOCs, GRO, DRO, ORO, and PCBs Boring ID Sample ID Sample Depth (ft bgs) Date Sampled 1, 2 , 4 - T r i m e t h y l b e n z e n e Ac e t o n e Be n z e n e Ca r b o n D i s u l f i d e Et h y l b e n z e n e Me t h y l E t h y l K e t o n e (M E K ) Me t h y l I s o b u t y l K e t o n e (M I K ) Me t h y l e n e C h l o r i d e n -B u t y l A l c o h o l To l u e n e Xy l e n e s , T o t a l Ga s o l i n e R a n g e Or g a n i c s ( G R O ) Di e s e l R a n g e O r g a n i c s (D R O ) Oi l R a n g e O r g a n i c s (O R O ) Ar o c l o r 1 2 6 0 Al l O t h e r Po l y c h l o r i n a t e d Bi p h e n y l s ( P C B s ) PCBs USEPA Method 8082 (mg/kg) Petroleum Hydrocarbons USEPA Method 8015 (mg/kg) Volatile Organic Compounds (VOCs) USEPA Method 8260B (mg/kg) AB-42 @ 0-2'' BGS 0.0 - 0.167 05/20/25 <0.0004 0.03 <0.0003 0.001 J <0.0002 <0.0009 <0.0008 <0.0008 <0.007 0.0007 J <0.0008 0.02 1,340 3,490 <0.07 ND AB-42 @ 4-5' BGS 4 - 5 05/20/25 0.001 0.08 0.0006 0.0009 J 0.0006 J <0.001 <0.001 <0.001 <0.01 0.003 0.004 0.03 123 449 J <0.09 ND AB-42 Dup @ 4-5' BGS 4 - 5 05/20/25 <0.0005 0.07 <0.0003 0.0008 J <0.0003 <0.001 <0.001 <0.001 <0.009 0.0008 J <0.0009 0.02 84 345 J <0.09 ND AB-42 @ 7' BGS 7 05/20/25 <0.0005 <0.009 <0.0003 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.009 0.0009 J 0.001 J 0.02 69 348 J <0.09 ND AB-43 @ 0-2'' BGS 0.0 - 0.167 05/20/25 <0.0004 <0.009 <0.0003 <0.0005 <0.0003 <0.001 <0.001 <0.0009 <0.008 0.0006 J <0.0009 0.02 1,860 4,940 <0.07 ND AB-43 @ 4-5' BGS 4 - 5 05/20/25 0.0008 J 0.09 <0.0003 0.001 J <0.0003 0.01 <0.001 <0.001 <0.009 0.002 0.003 J 0.03 195 729 <0.09 ND AB-43 @ 8.5 BGS 8.5 05/20/25 0.0007 J <0.01 <0.0004 <0.0006 <0.0003 <0.001 <0.001 <0.001 <0.01 0.002 0.003 J <0.03 111 377 <0.09 ND AB-44 @ 0-2'' BGS 0.0 - 0.167 05/20/25 <0.0004 <0.007 <0.0003 <0.0004 <0.0002 <0.0008 <0.0008 <0.0008 <0.007 0.0005 J 0.0008 J <0.02 2,590 6,500 <0.07 ND AB-44 @ 4-5' BGS 4 - 5 05/20/25 0.0007 J 0.02 <0.0003 <0.0006 0.0005 J 0.002 <0.001 <0.001 <0.009 0.002 0.003 J 0.02 220 1,280 <0.09 ND AB-44 @ 8' BGS 8 05/20/25 0.001 0.02 J <0.0004 <0.0007 <0.0003 0.003 <0.001 <0.001 <0.01 0.002 0.004 <0.03 159 638 J <0.1 ND -- USEPA RSL - Residential Soil 300 70,000 1.2 770 5.3 27,000 33,000 1,900 57 4,900 580 NE NE NE 0.24 Varies USEPA RSL - Industrial Soil 1,800 1,100,000 5.1 3,500 25 140,000 140,000 9,900 1,000 47,000 2,500 NE NE NE 0.99 Varies DEQ Initial Screening Levelsa NE NE 0.2 NE NE NE NE NE NE 9 142 150 500 500 NE NE Notes: USEPA - United States Environmental Protection Agency -- - Not analyzed mg/kg - Milligrams per kilogram < - Not reported at, or above, the indicated laboratory method reporting limit ft bgs - Feet below ground surface ND - Not detected, all analytes were not reported at, or above their reporting limit Shaded value was reported above the laboratory reporting limit J - Detected, but below the Reporting Limit. Therefore, result is an estimated concentration. Bold Values - Reported concentration exceeds USEPA RSL (Residental or Industrial) or DERR ISL B - Analyte found in the lab blank as well. Bold Underlined Values - Reported concentration exceeds USEPA Residenital and Industrial Soil RSL NE - Not established RSL - Regional Screening Level, value provided in the RSL Summary Table, dated November 2024 a - Utah Department of Environmental Response and Remediation (DERR) Initial Screening Level (ISL), November 1, 2005 AB-42 AB-43 AB-44 Soil Analytical Summary Table - VOCs, GRO, DRO, etc, rev3.xlsx, Table 2 Page 3 of 3 Power District Redevelopment Project VCP Area B 1569 West North Temple Street Salt Lake City, Utah Table 3 Summary of Soil Analytical Results - SVOCs Boring ID Sample ID Sample Depth (ft bgs) Date Sampled 2- M e t h y l n a p h t h a l e n e An t h r a c e n e Be n z o ( a ) a n t h r a c e n e Be n z o ( a ) p y r e n e Be n z o ( b ) f l u o r a n t h e n e Be n z o ( g , h , i ) p e r l y e n e Be n z o ( k ) f l u o r a n t h e n e Bi s ( 2 - e t h y l h e x y l ) P h t h a l a t e Bu t y l b e n z y l p h t h a l a t e Ch r y s e n e Fl u o r a n t h e n e In d e n o ( 1 , 2 , 3 - c d ) p y r e n e Na p h t h a l e n e Ph e n a n t h r e n e Py r e n e A l l O t h e r S e m i - v o l a t i l e Or g a n i c C o m p o u n d s AB-21 @ 0-2'' BGS 0.0 - 0.167 05/19/25 <0.09 <0.11 0.10 J 0.10 J 0.12 J <0.11 <0.11 <0.09 <0.11 0.12 J 0.21 J <0.09 <0.07 <0.11 0.20 J ND AB-21 Dup @ 0-2'' BGS 0.0 - 0.167 05/19/25 <0.09 <0.11 <0.07 <0.10 <0.09 <0.11 <0.11 <0.09 <0.12 <0.10 <0.10 <0.09 <0.07 <0.11 <0.10 ND AB-21 @ 4-5' BGS 4 - 5 05/19/25 <0.11 0.26 J 0.69 0.66 1.15 J 0.78 0.41 J <0.11 <0.14 0.84 1.35 <0.11 <0.09 0.67 1.43 ND AB-21 @ 9-11' BGS 9 - 11 05/19/25 <0.10 <0.12 <0.08 0.13 J <0.10 <0.12 <0.12 <0.10 <0.13 <0.11 <0.10 <0.10 <0.08 <0.12 <0.11 ND AB-22 @ 0-2" BGS 0.0 - 0.167 05/19/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.11 <0.14 <0.12 <0.11 <0.10 <0.08 <0.13 <0.12 ND AB-22 @ 4-5' BGS 4 - 5 05/19/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.11 <0.14 <0.12 <0.11 <0.10 <0.08 <0.13 <0.12 ND AB-22 @ 8-9' BGS 8 - 9 05/19/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-23 @ 0-2'' BGS 0.0 - 0.167 05/19/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.11 <0.13 <0.11 <0.11 <0.10 <0.08 <0.13 <0.12 ND AB-23 @ 4-5' BGS 4 - 5 05/19/25 <0.11 <0.14 <0.09 <0.12 <0.12 <0.14 <0.13 <0.11 <0.14 <0.12 <0.12 <0.11 <0.09 <0.13 <0.12 ND AB-23 @ 7' BGS 7 05/19/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.13 <0.12 ND AB-24 @ 0-2'' BGS 0.0 - 0.167 05/19/25 <0.10 <0.11 <0.07 <0.10 <0.10 <0.12 <0.12 <0.09 <0.12 <0.10 <0.10 <0.09 <0.07 <0.11 <0.10 ND AB-24 @ 4-5' BGS 4 - 5 05/19/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.11 <0.13 <0.11 <0.11 <0.10 <0.08 <0.13 <0.12 ND AB-24 Dup @ 4-5' BGS 4 - 5 05/19/25 <0.10 <0.12 <0.08 <0.11 <0.11 <0.13 <0.12 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-24 @ 8' BGS 8 05/19/25 <0.10 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-25 @ 0-2'' BGS 0.0 - 0.167 05/19/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-25 @ 4-5' BGS 4 - 5 05/19/25 <0.10 <0.12 <0.08 <0.10 <0.10 <0.12 <0.12 <0.10 <0.13 <0.11 <0.10 <0.09 <0.08 <0.12 <0.11 ND AB-25 @ 7' BGS 7 05/19/25 <0.10 <0.12 <0.08 <0.11 <0.11 <0.13 <0.12 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-26 @ 0-2'' BGS 0.0 - 0.167 05/19/25 <0.09 <0.11 <0.07 <0.09 <0.09 <0.11 <0.11 <0.09 <0.11 <0.09 <0.09 <0.08 <0.07 <0.10 <0.10 ND AB-26 @ 4-5' BGS 4 - 5 05/19/25 <0.10 <0.12 0.23 J 0.25 J 0.24 J 0.22 J <0.13 <0.10 <0.13 0.25 J 0.41 J 0.16 J <0.08 0.17 J 0.43 J ND AB-26 @ 8' BGS 8 05/19/25 <0.12 <0.14 <0.09 <0.12 <0.12 <0.14 <0.14 <0.12 <0.15 <0.12 <0.12 <0.11 <0.09 <0.14 <0.13 ND AB-27 @ 0-2'' BGS 0.0 - 0.167 05/19/25 <0.10 <0.12 <0.07 <0.10 <0.10 <0.12 <0.12 <0.10 <0.12 <0.10 <0.10 <0.09 <0.07 <0.11 <0.11 ND AB-27 @ 4-5' BGS 4 - 5 05/19/25 <0.10 <0.12 <0.07 <0.10 <0.10 <0.12 <0.12 <0.10 <0.12 <0.10 <0.10 <0.09 <0.08 <0.12 <0.11 ND AB-27 @ 7' BGS 7 05/19/25 <0.10 <0.12 <0.08 <0.11 <0.10 <0.12 <0.12 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-28 @ 0-2'' BGS 0.0 - 0.167 05/19/25 <0.11 <0.13 <0.08 0.12 J 0.12 J <0.13 <0.13 <0.11 <0.14 <0.11 <0.11 <0.10 <0.08 <0.13 0.12 J ND AB-28 @ 4-5' BGS 4 - 5 05/19/25 <0.11 <0.13 <0.08 <0.12 <0.11 <0.13 <0.13 <0.11 <0.14 <0.12 <0.11 <0.10 <0.09 <0.13 <0.12 ND AB-28 @ 7' BGS 7 05/19/25 <0.10 <0.12 <0.08 <0.11 <0.10 <0.12 <0.12 <0.10 <0.13 <0.11 <0.10 <0.10 <0.08 <0.12 <0.11 ND AB-28 Dup @ 7' BGS 7 05/19/25 <0.10 <0.12 <0.08 <0.11 <0.11 <0.13 <0.13 <0.10 <0.13 <0.11 <0.10 <0.10 <0.08 <0.12 <0.11 ND AB-29 @ 0-2'' BGS 0.0 - 0.167 05/19/25 <0.09 <0.11 <0.07 <0.10 <0.10 <0.12 <0.11 <0.09 <0.12 <0.10 <0.10 <0.09 <0.07 <0.11 <0.10 ND AB-29 @ 4-5' BGS 4 - 5 05/19/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.11 <0.14 <0.12 <0.11 <0.10 <0.08 <0.13 <0.12 ND AB-29 @ 8' BGS 8 05/19/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-30 @ 0-2'' BGS 0.0 - 0.167 05/20/25 0.10 J <0.12 0.10 J <0.11 <0.11 <0.13 <0.12 <0.10 <0.13 0.11 J 0.33 J <0.10 <0.08 0.66 0.38 J ND AB-30 Dup @ 0-2' BGS 0.0 - 0.167 05/20/25 <0.10 <0.12 <0.08 <0.11 <0.11 <0.13 <0.13 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 0.43 J <0.11 ND AB-30 @ 4-5' BGS 4 - 5 05/20/25 <0.10 <0.12 <0.08 <0.11 <0.11 <0.13 <0.12 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-30 @ 8' BGS 8 05/20/25 <0.10 <0.11 <0.08 <0.11 <0.11 <0.13 <0.13 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND Semi-volatile Organic Compounds USEPA Method 8270 (mg/kg) AB-26 AB-27 AB-28 AB-29 AB-30 AB-21 AB-22 AB-23 AB-24 AB-25 Soil Analytical Summary Table - SVOCs, rev2.xlsx, Table 2 Page 1 of 3 Power District Redevelopment Project VCP Area B 1569 West North Temple Street Salt Lake City, Utah Table 3 Summary of Soil Analytical Results - SVOCs Boring ID Sample ID Sample Depth (ft bgs) Date Sampled 2- M e t h y l n a p h t h a l e n e An t h r a c e n e Be n z o ( a ) a n t h r a c e n e Be n z o ( a ) p y r e n e Be n z o ( b ) f l u o r a n t h e n e Be n z o ( g , h , i ) p e r l y e n e Be n z o ( k ) f l u o r a n t h e n e Bi s ( 2 - e t h y l h e x y l ) P h t h a l a t e Bu t y l b e n z y l p h t h a l a t e Ch r y s e n e Fl u o r a n t h e n e In d e n o ( 1 , 2 , 3 - c d ) p y r e n e Na p h t h a l e n e Ph e n a n t h r e n e Py r e n e A l l O t h e r S e m i - v o l a t i l e Or g a n i c C o m p o u n d s Semi-volatile Organic Compounds USEPA Method 8270 (mg/kg) AB-31 @ 0-2'' BGS 0.0 - 0.167 05/20/25 <0.10 <0.11 <0.07 <0.10 <0.10 <0.12 <0.11 <0.09 <0.12 <0.10 <0.10 <0.09 <0.07 <0.11 <0.10 ND AB-31 @ 4-5' BGS 4 - 5 05/20/25 <0.11 <0.14 <0.09 <0.12 <0.12 <0.14 <0.14 <0.11 <0.14 <0.12 <0.12 <0.11 <0.09 <0.13 <0.12 ND AB-31 Dup @ 4-5' BGS 4 - 5 05/20/25 <0.10 <0.12 <0.08 <0.11 <0.11 <0.13 <0.12 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-31 @ 7' BGS 7 05/20/25 <0.10 <0.12 <0.08 <0.11 <0.11 <0.13 <0.13 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-32 @ 0-2'' BGS 0.0 - 0.167 05/20/25 <0.09 <0.11 <0.07 0.10 J <0.09 0.11 J <0.11 <0.09 <0.11 0.15 J 0.09 J <0.09 <0.07 <0.11 0.13 J ND AB-32 @ 4-5' BGS 4 - 5 05/20/25 <0.10 <0.12 <0.08 <0.11 <0.11 <0.13 <0.12 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-32 @ 7' BGS 7 05/20/25 <0.10 <0.12 <0.08 <0.11 <0.11 <0.13 <0.12 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-33 @ 0-2'' BGS 0.0 - 0.167 05/20/25 <0.09 <0.11 <0.07 <0.10 <0.10 <0.11 <0.11 <0.09 <0.12 <0.10 <0.10 <0.09 <0.07 <0.11 <0.10 ND AB-33 @ 4-5' BGS 4 - 5 05/20/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.11 <0.14 <0.11 <0.11 <0.10 <0.08 <0.13 <0.12 ND AB-33 @ 7' BGS 7 05/20/25 <0.10 <0.12 <0.08 <0.10 <0.10 <0.12 <0.12 <0.10 <0.13 <0.11 <0.10 <0.09 <0.08 <0.12 <0.11 ND AB-34 @ 0-2'' BGS 0.0 - 0.167 05/20/25 <0.10 <0.12 <0.07 0.25 J 0.40 J 0.20 J <0.12 <0.10 1.63 <0.10 0.47 <0.09 0.18 J 0.26 J 1.94 J ND AB-34 @ 4-5' BGS 4 - 5 05/20/25 <0.11 <0.13 <0.09 <0.12 <0.12 <0.14 <0.14 3.09 <0.14 <0.12 <0.12 <0.11 <0.09 <0.13 <0.12 ND AB-34 @ 7.5 BGS 7.5 05/20/25 <0.09 <0.11 <0.07 <0.10 <0.10 <0.12 <0.11 <0.09 <0.12 <0.10 <0.10 <0.09 <0.07 <0.11 <0.10 ND AB-35 @ 0-2'' BGS 0.0 - 0.167 05/20/25 <0.10 <0.11 0.23 J 0.28 J 0.41 J 0.16 J <0.12 <0.09 <0.12 0.27 J 0.29 J 0.13 J <0.07 0.13 J 0.33 J ND AB-35 @ 4-5' BGS 4 - 5 05/20/25 <0.10 <0.12 <0.08 <0.11 <0.11 <0.13 <0.12 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-35 @ 7' BGS 7 05/20/25 <0.10 <0.12 <0.08 <0.11 <0.10 <0.12 <0.12 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-35 @ 7' BGS DUP 7 05/20/25 <0.10 <0.12 <0.08 <0.11 <0.10 <0.12 <0.12 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-36 @ 0-2'' BGS 0.0 - 0.167 05/21/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 0.17 J <0.13 <0.11 <0.11 <0.10 <0.08 <0.13 <0.11 ND AB-36 @ 4-5' BGS 4 - 5 05/21/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.11 <0.14 <0.12 <0.11 <0.10 <0.08 <0.13 <0.12 ND AB-36 @ 7.5 BGS 7.5 05/21/25 <0.12 <0.14 <0.09 <0.13 <0.12 <0.15 <0.14 <0.12 <0.15 <0.13 <0.12 <0.11 <0.09 <0.14 <0.13 ND AB-37 @ 0-2'' BGS 0.0 - 0.167 05/21/25 <0.10 <0.12 <0.08 <0.11 <0.10 <0.12 <0.12 <0.10 <0.13 <0.11 <0.10 <0.10 <0.08 <0.12 <0.11 ND AB-37 @ 4-5' BGS 4 - 5 05/21/25 <0.11 <0.13 <0.09 <0.12 <0.11 <0.14 <0.13 <0.11 <0.14 <0.12 <0.12 <0.11 <0.09 <0.13 <0.12 ND AB-37 @ 7' BGS 7 05/21/25 <0.10 <0.12 <0.08 <0.11 <0.11 <0.13 <0.12 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-38 @ 0-2'' BGS 0.0 - 0.167 05/21/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.11 <0.14 <0.11 <0.11 <0.10 <0.08 <0.13 <0.12 ND AB-38 @ 4-5' BGS 4 - 5 05/21/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.13 <0.12 ND AB-38 @ 7.5 BGS 7.5 05/21/25 <0.10 <0.12 <0.08 <0.11 <0.10 <0.12 <0.12 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-39 @ 0-2'' BGS 0.0 - 0.167 05/21/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-39 @ 4-5' BGS 4 - 5 05/21/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.11 <0.14 <0.11 <0.11 <0.10 <0.08 <0.13 <0.12 ND AB-39 @ 7' BGS 7 05/21/25 <0.10 <0.12 <0.08 <0.11 <0.11 <0.13 <0.12 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-40 @ 0-2'' BGS 0.0 - 0.167 05/21/25 <0.10 <0.12 <0.07 <0.10 <0.10 <0.12 <0.12 <0.10 <0.12 <0.10 <0.10 <0.09 <0.07 <0.11 <0.10 ND AB-40 @ 4-5' BGS 4 - 5 05/21/25 <0.10 <0.12 <0.08 <0.11 <0.11 <0.13 <0.12 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-40 @ 8' BGS 8 05/21/25 <0.10 <0.12 <0.08 <0.10 <0.10 <0.12 <0.12 <0.10 <0.12 <0.10 <0.10 <0.09 <0.08 <0.12 <0.11 ND AB-41 @ 0-2'' BGS 0.0 - 0.167 05/21/25 <0.10 <0.12 <0.07 0.11 J <0.10 0.13 J <0.12 <0.10 <0.12 <0.10 <0.10 <0.09 <0.07 <0.11 <0.11 ND AB-41 @ 4-5' BGS 4 - 5 05/21/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.11 <0.14 <0.11 <0.11 <0.10 <0.08 <0.13 <0.12 ND AB-41 AB-31 AB-32 AB-33 AB-34 AB-35 AB-36 AB-37 AB-38 AB-39 AB-40 Soil Analytical Summary Table - SVOCs, rev2.xlsx, Table 2 Page 2 of 3 Power District Redevelopment Project VCP Area B 1569 West North Temple Street Salt Lake City, Utah Table 3 Summary of Soil Analytical Results - SVOCs Boring ID Sample ID Sample Depth (ft bgs) Date Sampled 2- M e t h y l n a p h t h a l e n e An t h r a c e n e Be n z o ( a ) a n t h r a c e n e Be n z o ( a ) p y r e n e Be n z o ( b ) f l u o r a n t h e n e Be n z o ( g , h , i ) p e r l y e n e Be n z o ( k ) f l u o r a n t h e n e Bi s ( 2 - e t h y l h e x y l ) P h t h a l a t e Bu t y l b e n z y l p h t h a l a t e Ch r y s e n e Fl u o r a n t h e n e In d e n o ( 1 , 2 , 3 - c d ) p y r e n e Na p h t h a l e n e Ph e n a n t h r e n e Py r e n e A l l O t h e r S e m i - v o l a t i l e Or g a n i c C o m p o u n d s Semi-volatile Organic Compounds USEPA Method 8270 (mg/kg) AB-42 @ 0-2'' BGS 0.0 - 0.167 05/20/25 <0.82 <0.98 <0.63 <0.86 <0.84 <1.00 <0.99 <0.81 <1.03 <0.87 <0.85 <0.78 <0.64 <0.97 <0.89 ND AB-42 @ 4-5' BGS 4 - 5 05/20/25 <0.10 <0.12 <0.08 0.13 J <0.10 <0.12 <0.12 0.10 J <0.13 <0.11 0.11 J <0.10 <0.08 0.16 J <0.11 ND AB-42 Dup @ 4-5' BGS 4 - 5 05/20/25 <0.10 <0.12 <0.08 <0.10 <0.10 <0.12 <0.12 <0.10 <0.12 <0.10 <0.10 <0.09 <0.08 <0.12 <0.11 ND AB-42 @ 7' BGS 7 05/20/25 <0.10 <0.12 <0.08 <0.11 <0.10 <0.12 <0.12 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.12 <0.11 ND AB-43 @ 0-2'' BGS 0.0 - 0.167 05/20/25 <1.65 <1.97 <1.26 2.57 J <1.68 <2.01 <1.98 <1.62 <2.06 <1.74 <1.70 <1.55 <1.27 <1.94 <1.79 ND AB-43 @ 4-5' BGS 4 - 5 05/20/25 <0.10 <0.12 0.08 J 0.19 J 0.13 J 0.19 J <0.12 <0.10 <0.13 <0.11 0.12 J <0.10 <0.08 <0.12 0.11 J ND AB-43 @ 8.5 BGS 8.5 05/20/25 <0.11 <0.13 <0.08 <0.11 <0.11 <0.13 <0.13 <0.10 <0.13 <0.11 <0.11 <0.10 <0.08 <0.13 <0.11 ND AB-44 @ 0-2'' BGS 0.0 - 0.167 05/20/25 <1.65 <1.97 <1.26 3.01 J <1.68 <2.01 <1.98 <1.62 <2.06 <1.74 <1.70 <1.55 <1.27 <1.94 <1.79 ND AB-44 @ 4-5' BGS 4 - 5 05/20/25 <0.10 <0.12 0.10 J 0.20 J 0.18 J 0.14 J <0.12 <0.10 <0.12 <0.11 0.15 J 0.09 J <0.08 <0.12 0.13 J ND AB-44 @ 8' BGS 8 05/20/25 <0.12 <0.14 <0.09 <0.13 <0.12 <0.15 <0.14 <0.12 <0.15 <0.13 <0.12 <0.11 <0.09 <0.14 <0.13 ND USEPA RSL - Residential Soil 240 18,000 1.1 0.11 1.1 NE 11 39 NE 110 2,400 1.1 2.0 NE 1,800 Varies USEPA RSL - Industrial Soil 3,000 230,000 21 2.1 21 NE 210 160 NE 2,100 30,000 21 8.6 NE 23,000 Varies DEQ Initial Screening Levelsa NE NE NE NE NE NE NE NE NE NE NE NE 51 NE NE Varies Notes: USEPA - United States Environmental Protection Agency mg/kg - Milligrams per kilogram ft bgs - Feet below ground surface J - Detected, but below the Reporting Limit. Therefore, result is an estimated concentration. < - Not reported at, or above, the indicated laboratory method reporting limit Shaded value was reported above the laboratory reporting limit Bold Values - Reported concentration exceeds USEPA RSL (Residental or Industrial) or DERR ISL Bold Underlined Values - Reported concentration exceeds USEPA Residenital and Industrial Soil RSL NE - Not established RSL - Regional Screening Level, value provided in the RSL Summary Table, dated November 2024 a - Utah Department of Environmental Response and Remediation (DERR) Initial Screening Level (ISL), November 1, 2005 The samples collected from borings NTO-9 and NTO-10 were composited by the laboratory. AB-42 AB-43 AB-44 Soil Analytical Summary Table - SVOCs, rev2.xlsx, Table 2 Page 3 of 3 Power District Redevelopment Project VCP Area B 1569 West North Temple Street Salt Lake City, Utah Table 4 Summary of Temporary Well Groundwater Analytical Results - RCRA Metals, Cyanide, GRO, DRO, ORO, VOCs, SVOCs, and PCBs Mercury USEPA Method 7470 Cyanide USEPA Method E335.4 SVOCs USEPA Method 8270D PCBs USEPA Method 8082 (mg/L)(mg/L)(mg/L)(mg/L) Boring ID Sample ID Date Sampled Ar s e n i c Ba r i u m Ca d m i u m Ch r o m i u m Le a d Se l e n i u m Si l v e r Me r c u r y Cy a n i d e Ga s o l i n e R a n g e O r g a n i c s (G R O ) Di e s e l R a n g e O r g a n i c s (D R O ) Oi l R a n g e O r g a n i c s (O R O ) 1, 1 - D i c h l o r o e t h a n e (1 , 1 - D C A ) Ch l o r o f o r m Al l O t h e r V O C s Se m i - v o l a t i l e O r g a n i c Co m p o u n d s PC B s AB-21 AB-21 GW 05/19/25 167 133 <0.1 <1.6 <0.9 <0.8 <0.2 <0.07 <4.00 <0.010 <0.2 <0.2 <0.4 1.1 ND ND ND AB-23 GW 05/19/25 15.1 57.1 <0.1 1.7 <0.9 <0.8 <0.2 <0.07 <4.00 <0.010 <0.2 <0.2 <0.4 <0.3 ND ND ND AB-23 GW Dup 05/19/25 14.9 56.1 <0.1 1.6 <0.9 <0.8 <0.2 <0.07 <4.00 <0.010 <0.2 <0.2 <0.4 <0.3 ND ND ND AB-25 AB-25 GW 05/19/25 15.6 68.9 <0.1 2.2 4.2 0.9 J <0.2 <0.07 <4.00 <0.010 <0.2 <0.2 <0.4 <0.3 ND ND ND AB-28 AB-28 GW 05/20/25 29.4 41.2 <0.1 1.6 <0.9 <0.4 <0.2 <0.07 <4.00 <0.010 <0.2 <0.2 <0.4 <0.3 ND ND ND AB-30 AB-30 GW 05/20/25 11.0 64.5 <0.1 2.8 <0.9 <0.8 <0.2 <0.07 <4.00 <0.010 <0.2 <0.2 <0.4 <0.3 ND ND ND AB-31 AB-31 GW 05/20/25 7.2 88.7 <0.1 <1.6 <0.9 0.6 <0.2 <0.07 <4.00 <0.010 <0.2 <0.2 <0.4 <0.3 ND ND ND AB-33 AB-33 GW 05/20/25 23.0 62.6 <0.1 <1.6 <0.9 1.8 <0.2 <0.07 <4.00 <0.010 <0.2 <0.2 <0.4 0.5 J ND ND ND AB-35 AB-35 GW 05/20/25 21.7 55.2 <0.1 2.0 <0.9 <0.8 <0.2 <0.07 <4.00 <0.010 <0.2 <0.2 <0.4 <0.3 ND ND ND AB-37 AB-37 GW 05/21/25 6.0 45.7 0.2 J <1.6 2.6 11.5 <0.2 <0.07 <4.00 <0.010 <0.2 <0.2 0.5 J <0.3 ND ND ND AB-38 AB-38 GW 05/21/25 9.1 70.1 <0.1 <1.6 1.5 <0.8 <0.2 <0.07 <4.00 <0.010 <0.2 <0.2 <0.4 <0.3 ND ND ND AB-39 AB-39 GW 05/22/25 1.5 159 0.05 J <0.8 2.4 3.3 0.1 J <0.07 <4.00 <0.010 <0.2 <0.2 <0.4 1.7 ND ND ND AB-42 AB-42 GW 05/20/25 90.4 95.3 <0.1 <1.6 <0.9 <0.8 <0.2 <0.07 <4.00 <0.010 <0.2 <0.2 <0.4 <0.3 ND ND ND AB-43 GW 05/22/25 1.0 221 <0.05 1.4 <0.4 <0.4 <0.1 <0.07 <4.00 <0.010 <0.2 <0.2 <0.4 0.5 J ND ND ND AB-43 GW Dup 05/22/25 1.0 220 <0.05 1.3 <0.4 <0.4 <0.1 <0.07 <4.00 <0.010 <0.2 <0.2 <0.4 <0.3 ND ND ND AB-44 AB-44 GW 05/22/25 87.9 255 <0.05 1.0 0.50 <0.4 <0.1 <0.07 <4.00 <0.010 <0.2 <0.2 <0.4 <0.3 ND ND ND 10 2,000 5.0 100 15 50 NE 2.0 200 NE NE NE 5.0 80 Varies Varies Varies 0.052 3,800 1.8 NE 15 100 94 0.63 1.5 NE NE NE 0.17 0.22 Varies Varies Varies NE NE NE NE NE NE NE NE NE 1 1 10 NE NE Varies Varies Varies Notes: USEPA - United States Environmental Protection Agency VOCs - Volatile Organic Compounds mg/L - Micrograms per liter SVOCs - Semi-volatile Organic Compounds ND - Not detected, all analytes were not reported at, or above their method reporting limit PCBs - Polychlorinated Biphenyls NE - Not Established mg/L - Milligrams per liter < - Not reported at, or above, the indicated laboratory method reporting limit J - Detected, but below the Reporting Limit. Therefore, result is an estimated concentration. Shaded value was reported above the laboratory reporting limit Bold Values - Reported concentration exceeds USEPA RSL Screening Level Bold and Underlined Values - Reported concentration exceeds USEPA MCL, USEPA RSL, and DERR ISL (if applicable) RSL - Regional Screening Level, value provided in the RSL Summary Table, dated November 2024 MCL - Maximum Contaminant Level a - Utah Department of Environmental Response and Remediation (DERR) Initial Screening Level (ISL), November 1, 2005 Volatile Organic Compounds USEPA Method 6020B (mg/L) DERR Initial Screening Levelsa USEPA RSL - Tap Water Screening Level Petroleum Hydrocarbons USEPA Method 8015 (mg/L) USEPA MCL RCRA Metals USEPA Methods 6020B (mg/L) AB-23 AB-43 Temp Well GW Analytical Summary Table, rev4.xlsx, Temp Well GW Page 1 of 1 Power District Redevelopment Project VCP Area B 1569 West North Temple Street Salt Lake City, Utah FIGURES Power District Redevelopment Project Boundary LEGEND SITE LOCATION MAP FIGURE TITLE DOCUMENT TITLE CLIENT LOCATION PROJECT NUMBER DATE AS SHOWNSCALE DJLDESIGNED BY CDAPPROVED BY SRMDRAWN BY FIGURE NUMBER 1 N 0 4,0002,000 SCALE FEET U.S.G.S. 7.5 MINUTE TOPOGRAPHIC QUADRANGLE SALT LAKE CITY, UT (2023) SOURCE: Site UTAH Power District Redevelopment Project 6/26/25 ROCKY MOUNTAIN POWER 2064-0034 POWER DISTRICT REDEVELOPMENT PROJECT – ADDENDUM TO SITE CHARACTERIZATION WORK PLAN - VCP AREA 'B' 1569 WEST NORTH TEMPLE STREET SALT LAKE CITY, UTAH 7963 Douglas Dr Park City, UT 84098 Phone: 801-450-8060 www.hillwestut.com ill Environmental H estW f1 _ S i t e L o c _ r 1 West North Temple Street Lincoln H i g h w a y Re d w o o d R o a d Jo r d a n R i v e r Railro a d VCP AREA 'C'VCP AREA 'B' South Temple Street Water Intake Dam Jo r d a n R i v e r VCP AREA 'D' VCP AREA 'A' LEGEND Power District Redevelopment Project Boundary Approximate Site Boundary GOOGLE EARTH (3-2025)IMAGE SOURCE: PO W E R D I S T R I C T A R E A M A P FI G U R E T I T L E DO C U M E N T T I T L E CL I E N T LO C A T I O N 6/26/25 PROJECT NUMBER DATE AS SHOWNSCALE DJLDESIGNED BY CDAPPROVED BY SRMDRAWN BY FIGURE NUMBER 2064-0034 2 N 0 600300 SCALE FEET 15 6 9 W E S T N O R T H T E M P L E S T R E E T SA L T L A K E C I T Y , U T A H 7963 Douglas Dr Park City, UT 84098 Phone: 801-450-8060 www.hillwestut.com ill Environmental H estW RO C K Y M O U N T A I N P O W E R PO W E R D I S T R I C T R E D E V E L O P M E N T P R O J E C T – AD D E N D U M T O S I T E C H A R A C T E R I Z A T I O N W O R K P L A N - V C P A R E A ' B ' f2 _ V C P A r e a s M a p _ r 9 LEGEND Power District Redevelopment Project Boundary Approximate Site Boundary Soil Boring, December 2020 Soil Boring, March 2021 Monitoring Well, ABF Freight Monitoring Well, 1993 Decommissioned Monitoring Well, 1993 Approximate Historical Coal Storage Area Boundary Soil Boring with Temporary Water Well, Tetra Tech December 2023 Groundwater Well, Tetra Tech December 2023 Soil Boring, Tetra Tech December 2023 NTO-21 NTO-24 MW-1 MW-3 MW-1 TT-2-2 TT-1-5 TT-1-4 Monitoring WellMW-8 Soil Boring (Soil Only), A&M May 2025AB-01 Soil Boring (Soil & Water), A&M May 2025AB-01 Soil Boring - CCR Profiling, A&M May 2025AB-01 West North Temple Street VCP AREA 'C' VCP AREA 'B' VCP AREA 'D' South Temple Street Shed FORMER ABF FREIGHT NTO-5 NTO-4 NTO-9 NTO-10 NTO-11 NTO-12 NTO-13 NTO-14 NTO-3 NTO-1NTO-2 NTO-16 NTO-17 NTO-15 NTO-18 NTO-19 NTO-20 NTO-23 MW-2 MW-6 MW-5 MW-3 MW-4 MW-1 TT-1-1TT-1-2 TT-2-11 TT-2-3 TT-2-5 TT-2-4 TT-2-6 TT-2-7 TT-2-9 TT-2-10 NTO-22 MW-9 MW-10 MW-13 MW-14 Former Gasoline UST (Decommissioned 1986) TT-2-2 Former Gasoline/Diesel USTs (Decommissioned 1990) Former Gasoline USTs (Decommissioned 1993) Former Gasoline/Diesel UST (Decommissioned 1993) Former Dispenser Island Approximate Limit of Former Excavation AB-25 AB-24 AB-23 AB-22 AB-21 AB-26 AB-27 AB-28 AB-29 AB-30 AB-32 AB-31 AB-33 AB-34AB-35 AB-36 AB-37 AB-38 AB-39 AB-15 AB-14 AB-40 AB-11AB-12 AB-13 AB-10 AB-09 AB-08 AB-42 AB-06 AB-05 AB-04 AB-43 AB-44AB-01AB-02AB-03AB-41 AB-07 AB-20AB-19 AB-17 AB-16 AB-18 TT-2-1 N 0 240120 SCALE FEET GOOGLE EARTH (3-2025)IMAGE SOURCE: SO I L B O R I N G L O C A T I O N S FI G U R E T I T L E DO C U M E N T T I T L E CL I E N T LO C A T I O N 6/26/25 PROJECT NUMBER DATE AS SHOWNSCALE DJLDESIGNED BY CDAPPROVED BY SRMDRAWN BY FIGURE NUMBER 2064-0034 3 15 6 9 W E S T N O R T H T E M P L E S T R E E T SA L T L A K E C I T Y , U T A H 7963 Douglas Dr Park City, UT 84098 Phone: 801-450-8060 www.hillwestut.com ill Environmental H estW RO C K Y M O U N T A I N P O W E R PO W E R D I S T R I C T R E D E V E L O P M E N T P R O J E C T – AD D E N D U M T O S I T E C H A R A C T E R I Z A T I O N W O R K P L A N - V C P A R E A ' B ' f4 _ S h a l l o w B o r L o c LEGEND Power District Redevelopment Project Boundary Approximate Site Boundary Soil Boring, March 2021 Monitoring Well, ABF Freight Monitoring Well, 1993 Decommissioned Monitoring Well, 1993 Approximate Historical Coal Storage Area Boundary Soil Boring with Temporary Water Well, Tetra Tech December 2023 Soil Boring, Tetra Tech December 2023 NTO-24 MW-1 MW-3 MW-1 TT-2-2 TT-1-5 TT-1-4 Monitoring WellMW-8 AB-41 AB-42 Soil Boring - CCR Profiling, A&M May 2025AB-01 Soil Boring (Soil Only), A&M May 2025 Soil Boring (Soil & Water), A&M May 2025 Proposed Soil Boring or Grab Sample Groundwater Well, Tetra Tech December 2023 Soil Boring, December 2020NTO-21 West North Temple Street VCP AREA 'C' VCP AREA 'B' VCP AREA 'D' South Temple Street Shed FORMER ABF FREIGHT NTO-5 NTO-4 NTO-9 NTO-10 NTO-11 NTO-12 NTO-13 NTO-14 NTO-3 NTO-1NTO-2 NTO-16 NTO-17 NTO-15 NTO-18 NTO-19 NTO-20 NTO-23 MW-2 MW-6 MW-5 MW-3 MW-4 MW-1 TT-1-1TT-1-2 TT-2-11 TT-2-3 TT-2-5 TT-2-4 TT-2-6 TT-2-7 TT-2-9 TT-2-10 NTO-22 MW-9 MW-10 MW-13 MW-14 Former Gasoline UST (Decommissioned 1986) TT-2-2 Former Gasoline/Diesel USTs (Decommissioned 1990) Former Gasoline USTs (Decommissioned 1993) Former Gasoline/Diesel UST (Decommissioned 1993) Former Dispenser Island Approximate Limit of Former Excavation NTO-4 AB-25 AB-24 AB-23 AB-22 AB-21 AB-26 AB-27 AB-28 AB-29 AB-30 AB-32 AB-31 AB-33 AB-34 AB-35 AB-36 AB-37 AB-38 AB-39 AB-15 AB-14 AB-40 AB-11AB-12 AB-13 AB-10 AB-09 AB-08 AB-42 AB-06 AB-05 AB-04 AB-43 AB-44AB-01AB-02AB-03AB-41 AB-07 AB-20AB-19 AB-17 AB-16 AB-18 TT-2-1 N 0 240120 SCALE FEETGOOGLE EARTH (3/2025)IMAGE SOURCE: PR O P O S E D A D D I T I O N A L S O I L B O R I N G L O C A T I O N S FI G U R E T I T L E DO C U M E N T T I T L E CL I E N T LO C A T I O N 6/25/25 PROJECT NUMBER DATE AS SHOWNSCALE DJLDESIGNED BY CDAPPROVED BY SRMDRAWN BY FIGURE NUMBER 2064-0034 4 15 6 9 W E S T N O R T H T E M P L E S T R E E T SA L T L A K E C I T Y , U T A H 7963 Douglas Dr Park City, UT 84098 Phone: 801-450-8060 www.hillwestut.com ill Environmental H estW RO C K Y M O U N T A I N P O W E R PO W E R D I S T R I C T R E D E V E L O P M E N T P R O J E C T – AD D E N D U M T O S I T E C H A R A C T E R I Z A T I O N W O R K P L A N - V C P A R E A ' B ' f5 _ P r o p A d d B o r i n g L o c LEGEND Power District Redevelopment Project Boundary Approximate Site Boundary Soil Boring, March 2021 Proposed Groundwater Monitoring Well Monitoring Well, ABF Freight Monitoring Well, 1993 Decommissioned Monitoring Well, 1993 Approximate Historical Coal Storage Area Boundary Soil Boring with Temporary Water Well, Tetra Tech December 2023 Soil Boring, Tetra Tech December 2023 NTO-24 MW-1 MW-3 MW-1 TT-2-2 TT-1-5 TT-1-4 Monitoring WellMW-8 AB-41 AB-42 Soil Boring - CCR Profiling, A&M May 2025AB-01 Soil Boring (Soil Only), A&M May 2025 Soil Boring (Soil & Water), A&M May 2025 Groundwater Well, Tetra Tech December 2023 Soil Boring, December 2020NTO-21 West North Temple Street VCP AREA 'C' VCP AREA 'B' VCP AREA 'D' South Temple Street Shed FORMER ABF FREIGHT NTO-5 NTO-4 NTO-9 NTO-10 NTO-11 NTO-12 NTO-13 NTO-14 NTO-3 NTO-1NTO-2 NTO-16 NTO-17 NTO-15 NTO-18 NTO-19 NTO-20 NTO-23 MW-2 MW-6 MW-5 MW-3 MW-4 MW-1 TT-1-1TT-1-2 TT-2-11 TT-2-3 TT-2-5 TT-2-4 TT-2-6 TT-2-7 TT-2-9 TT-2-10 NTO-22 MW-9 MW-10 MW-13 MW-14 Former Gasoline UST (Decommissioned 1986) TT-2-2 Former Gasoline/Diesel USTs (Decommissioned 1990) Former Gasoline USTs (Decommissioned 1993) Former Gasoline/Diesel UST (Decommissioned 1993) Former Dispenser Island Approximate Limit of Former Excavation NTO-4 AB-25 AB-24 AB-23 AB-22 AB-21 AB-26 AB-27 AB-28 AB-29 AB-30 AB-32 AB-31 AB-33 AB-34 AB-35 AB-36 AB-37 AB-38 AB-39 AB-15 AB-14 AB-40 AB-11AB-12 AB-13 AB-10 AB-09 AB-08 AB-42 AB-06 AB-05 AB-04 AB-43 AB-44AB-01AB-02AB-03AB-41 AB-07 AB-20AB-19 AB-17 AB-16 AB-18 TT-2-1 N 0 240120 SCALE FEETGOOGLE EARTH (3/2025)IMAGE SOURCE: PR O P O S E D G R O U N D W A T E R M O N I T O R I N G W E L L L O C A T I O N S FI G U R E T I T L E DO C U M E N T T I T L E CL I E N T LO C A T I O N 6/26/25 PROJECT NUMBER DATE AS SHOWNSCALE DJLDESIGNED BY CDAPPROVED BY SRMDRAWN BY FIGURE NUMBER 2064-0034 5 15 6 9 W E S T N O R T H T E M P L E S T R E E T SA L T L A K E C I T Y , U T A H 7963 Douglas Dr Park City, UT 84098 Phone: 801-450-8060 www.hillwestut.com ill Environmental H estW RO C K Y M O U N T A I N P O W E R PO W E R D I S T R I C T R E D E V E L O P M E N T P R O J E C T – AD D E N D U M T O S I T E C H A R A C T E R I Z A T I O N W O R K P L A N - V C P A R E A ' B ' f6 _ P r o p G W W e l l s L o c LEGEND Power District Redevelopment Project Boundary Approximate Site Boundary Soil Boring, March 2021 Monitoring Well, ABF Freight Monitoring Well, 1993 Decommissioned Monitoring Well, 1993 Approximate Historical Coal Storage Area Boundary Soil Boring with Temporary Water Well, Tetra Tech December 2023 Groundwater Well, Tetra Tech December 2023 Soil Boring, Tetra Tech December 2023 NTO-24 MW-1 MW-3 MW-1 TT-2-2 TT-1-5 TT-1-4 Monitoring WellMW-8 AB-41 AB-42 Soil Boring - CCR Profiling, A&M May 2025AB-01 Soil Boring (Soil Only), A&M May 2025 Soil Boring (Soil & Water), A&M May 2025 Soil Boring, December 2020NTO-21Proposed Methane Soil Gas Sample West North Temple Street VCP AREA 'C' VCP AREA 'B' VCP AREA 'D' South Temple Street Shed FORMER ABF FREIGHT NTO-5 NTO-4 NTO-9 NTO-10 NTO-11 NTO-12 NTO-13 NTO-14 NTO-3 NTO-1NTO-2 NTO-16 NTO-17 NTO-15 NTO-18 NTO-19 NTO-20 NTO-23 MW-2 MW-6 MW-5 MW-3 MW-4 MW-1 TT-1-1TT-1-2 TT-2-11 TT-2-3 TT-2-5 TT-2-4 TT-2-6 TT-2-7 TT-2-9 TT-2-10 NTO-22 MW-9 MW-10 MW-13 MW-14 Former Gasoline UST (Decommissioned 1986) TT-2-2 Former Gasoline/Diesel USTs (Decommissioned 1990) Former Gasoline USTs (Decommissioned 1993) Former Gasoline/Diesel UST (Decommissioned 1993) Former Dispenser Island Approximate Limit of Former Excavation NTO-4 AB-25 AB-24 AB-23 AB-22 AB-21 AB-26 AB-27 AB-28 AB-29 AB-30 AB-32 AB-31 AB-33 AB-34 AB-35 AB-36 AB-37 AB-38 AB-39 AB-15 AB-14 AB-40 AB-11AB-12 AB-13 AB-10 AB-09 AB-08 AB-42 AB-06 AB-05 AB-04 AB-43 AB-44AB-01AB-02AB-03AB-41 AB-07 AB-20AB-19 AB-17 AB-16 AB-18 TT-2-1 N 0 240120 SCALE FEETGOOGLE EARTH (3/2025)IMAGE SOURCE: PR O P O S E D S O I L G A S S A M P L E L O C A T I O N S FI G U R E T I T L E DO C U M E N T T I T L E CL I E N T LO C A T I O N 6/26/25 PROJECT NUMBER DATE AS SHOWNSCALE DJLDESIGNED BY CDAPPROVED BY SRMDRAWN BY FIGURE NUMBER 2064-0034 6 15 6 9 W E S T N O R T H T E M P L E S T R E E T SA L T L A K E C I T Y , U T A H 7963 Douglas Dr Park City, UT 84098 Phone: 801-450-8060 www.hillwestut.com ill Environmental H estW RO C K Y M O U N T A I N P O W E R PO W E R D I S T R I C T R E D E V E L O P M E N T P R O J E C T – AD D E N D U M T O S I T E C H A R A C T E R I Z A T I O N W O R K P L A N - V C P A R E A ' B ' f6 _ P r o p S o i l G a s L o c