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HomeMy WebLinkAboutDERR-2025-000061 ________________________________________________________________________________________ Page 1 ATLAS 358 South 700 East, B518 Salt Lake City, Utah 84102 www.oneatlas.com Office: 801-935-4917 SUBJECT: Petroleum Impacted Soil Removal Report Shulsen Property (Vacant Lot – Monroe Street) 10125 South 280 West Sandy, Utah 84070 Facility ID No. 4002449 Release Site MSO Dear Ms. Brennan: The following document presents a summary of the petroleum impacted soil removal activities preformed at the site in November and December, 2024. These activities were performed in accordance with the approved Corrective Action Plan (CAP) for the site prepared by Atlas Technical Consultants LLC (Atlas) dated June 28, 2024, and the corresponding Utah Department of Environmental Quality Division of Environmental Response and Remediation (DERR) CAP approval letter dated October 28, 2024. Information provided by the property owner indicates that the site is slated for development as a multifamily apartment complex. SOIL EXCAVATION ACTIVITIES The primary objective of the excavation effort was to remove petroleum impacted soil present in the area of the former heating oil Underground Storage Tank (UST) located at the site. Please refer to Figure 1 for the location of the former UST. Atlas utilized a subcontractor for soil excavation and transportation operations; and backfill and compaction efforts. Prior to soil removal activities, Atlas contacted the Utah Blue Stakes Center to mark underground utilities at the site. In addition, a private firm was utilized to locate underground utilities within the proposed area of excavation. Atlas prepared a site specific Health and Safety Plan for the project and a safety briefing was held with all on-site personnel each morning prior to initiating any work. The soil removal effort was conducted on November 4, 2024. During the excavation process, a field portable organic vapor monitor (OVM) was utilized to screen excavated soil. An OVM reading of 20 ppm-v (parts per million by volume) was used to segregate clean from impacted soil. In addition to using the OVM to segregate impacted soil, visual observations were used to evaluate clean versus impacted soil. The area of excavation was approximately 17-feet x 17- feet x 8-feet deep, and the total volume of soil removed is estimated to be approximately 85 cubic yards. The soil removed from the excavation was stockpiled on site and a sample was collected to setup the soil disposal profile. Soils encountered during the excavation effort consisted of fill material (topsoil, sand, and silt) to a depth of approximately one foot below grade. Beneath the fill material, silty sand was Salt Lake City, UT 841114 P.O. Box 144840 195 North 1950 West Division of Environmental Response and Remediation Utah Department of Environmental Quality Ms. Eileen Brennan January 3, 2025 Page 2 ATLAS encountered to a depth of approximately four feet below grade. Beneath the silty sand, fine sand with a little gravel was encountered to the depth of the excavation at eight feet below grade. Groundwater was not encountered during the soil removal effort. Photographs of the soil removal activities are presented in Appendix A. A total of nine confirmatory soil samples were collected from the sidewalls and floor of the excavation and submitted for chemical analyses. Please refer to Figure 1 for the sample locations. The sidewall samples were collected from depths ranging from four feet to eight feet below grade. The floor sample was collected from the center of the excavation at a depth of eight feet below grade. The samples were collected directly from the track hoe bucket into laboratory-provided two-ounce wide-mouth glass jars. A portion of each sample was also placed in a zip-lock baggie for field screening purposes using a portable OVM. The jars were sealed with Teflon® lined lids, labeled, and immediately stored on ice inside an insulated cooler. The samples were transported under chain of custody documentation to a Utah-certified laboratory and analyzed for benzene, toluene, ethylbenzene, xylenes, and naphthalene (BTEXN) using United States Environmental Protection Agency (U.S. EPA) Method 8260 and for Total petroleum Hydrocrbon as Diesel (TPH-DRO) using USEPA Method 8015. During the excavation effort no soil sample OVM readings were measured above the background concentration of 1.0 ppm-v and no obvious signs of soil impacts were observed. CONFIRMATORY SAMPLING RESULTS Review of the laboratory results for soil samples collected from the excavation indicated no detection of the BTEXN constituents above the laboratory reporting limits, with the exception of toluene and naphthalene. However, these concentrations are below the DERR Initial Screening Level (ISLs). Review of the TPH-DRO results indicated the presence of diesel in the samples collected from the North Wall @ 4’ (1.51 milligrams per kilogram (mg/kg)), West Wall @ 4’ (4.64 mg/kg), South Wall @ 4’ (3.32 mg/kg), East Wall @ 4’ (11.7 mg/kg), and the Stockpile (3.53 mg/kg). However, none of the concentrations exceeded the DERR ISL of 500 mg/kg. The confirmatory soil laboratory results are summarized in Table 1 and a copy of the laboratory report is presented in Appendix B. EXCAVATION BACKFILL AND COMPACTION On December 9, 2024, the excavation backfill effort was completed. Since the stockpiled soil was not suitable for compaction, the soil was transported to the Salt Lake County Landfill and processed as clean fill. The excavation was backfilled with clean road base material from the Staker Beef Hollow Gravel Pit located in Bluffdale, Utah. The excavation was backfilled and compacted in two foot lifts to surface grade level. Copies of the Salt Lake County Landfill soil disposal approval correspondence and soil compaction report are presented in Appendix C. CONCLUSIONS AND RECOMMENDATIONS Approximately 85 cubic yards of low level petroleum hydrocarbon impacted soil were removed from the site and transported to the Salt Lake County Landfill for disposal. Results of the confirmatory soil sampling indicated no detection of petroleum constituents above the DERR ISLs. Information provided by the Client indicates that the site is slated for development as a multi-family residential facility. The layout of the facility is present in Figure 2 with the approximate location of the former UST. Based upon the review of the laboratory results, Atlas recommends no further actions at the site and that the DERR consider this release case for closure. Page 3 ATLAS Our services consist of professional opinions and recommendations made in accordance with generally accepted geotechnical and environmental engineering principles and practices. This warranty is in lieu of all other warranties either expressed or implied. Should you have any questions, please do not hesitate to call us at (801) 935-4917. Sincerely, Atlas James J. Coletta, P.G. Branch Manager Utah Certified PST Consultant JC/BA cc: Mr . Sam Evans, Wasatch Residential Group FIGURES 358 South 700 East, B518 Salt Lake City, Utah 84102 (801) 935-4917 SOIL EXCAVATION AND SAMPLE LOCATION MAP FIGURE 1 SOURCE: Google Maps DRAWN BY: JC DATE: 12/24 REVIEWED BY: JC PROJECT NO: 271EM00873 Shulsen Property 10125 South 280 West (Monroe St.) Sandy, Utah 84070 Approximate Scale: 1” = 76’ Mo n r o e St r e e t In t e r s t a t e 15 Property Boundary Approximate location of former heating oil UST and area of excavation Excavation Sample Locations (excavation dimensions 17’x17’x8’ deep) Center Floor @ 8’ X X XX X West Wall @ 4’ and 8’ North Wall @ 4’ and 8’ East Wall @ 4’ and 8’ South Wall @ 4’ and 8’ 358 South 700 East, B518 Salt Lake City, Utah 84102 (801) 935-4917 SOIL EXCAVATION WITH PROPOSED APARTMENT COMPLEX OVERLAY FIGURE 2 SOURCE: Google Maps DRAWN BY: JC DATE: 12/24 REVIEWED BY: JC PROJECT NO: 271EM00873 Shulsen Property 10125 South 280 West (Monroe St.) Sandy, Utah 84070 Approximate Location of Excavation Approximate Scale: 1” = 76’ TABLES North Wall @ 4'<1.0 11/04/24 <0.00108 0.00309 B,J <0.00271 <0.00703 <0.0135 1.51 J North Wall @ 8'<1.0 11/04/24 <0.00102 0.00251 B,J <0.00256 <0.00666 0.0184 <4.05 West Wall @ 4'<1.0 11/04/24 <0.00113 0.00248 B,J <0.00281 <0.00731 <0.0141 4.64 West Wall @ 8'<1.0 11/04/24 <0.00105 0.00170 B,J <0.00262 <0.00680 <0.0131 <4.07 South Wall @ 4'<1.0 11/04/24 <0.00108 0.00308 B,J <0.00271 <0.00702 <0.0135 3.32 J South Wall @ 8'<1.0 11/04/24 <0.00104 0.00250 B,J <0.00260 <0.00676 0.0130 <4.08 East Wall @ 4'<1.0 11/04/24 <0.00113 0.00305 B,J <0.00282 <0.00734 <0.0141 11.7 East Wall @ 8'<1.0 11/04/24 <0.00109 0.00226 B,J <0.00272 <0.00706 <0.0136 <4.17 Center Floor @ 8'<1.0 11/04/24 <0.00113 0.00251 B,J <0.00283 <0.00733 <0.0141 <4.23 Stockpile <1.0 11/04/24 <0.00111 0.00272 B,J <0.00279 <0.00722 <0.0139 3.53 J 0.2 9.0 5.0 142 51 500 0.9 25 23 142 51 5000 LEGEND Bold values indicate an exceedence of the UDEQ Initial Screening Level B - The same analyte is found in the associated blank. J - The identification of the analyte is acceptable, the reported value is an estimate. TABLE 1 SOIL EXCAVATION ANALYTICAL SUMMARY FORMER SHULSEN PROPERTY (VACANT LOT - MONROE STREET) UDEQ Initial Screening Level SANDY, UTAH TPH-DRO FACILITY ID 4002449, RELEASE ID MSO Toluene Xylenes Naphthalene UDEQ Tier I Screening Level 10125 SOUTH 280 WEST (all concentrations are expressed in milligrams per kilogram, mg/kg) DatePID Reading ppm-vSample Location EthylbenzeneBenzene APPENDIX A PHOIOGRAPHS SOIL EXCAVATION PROJECT SHULSEN PROPERTY 10125 SOUTH 280 WEST SANDY, UTAH Project No. 271EM00873 Atlas Technical Services Photo 1: View facing north of former UST area prior to the start of the soil removal effort Photo 2: View of the south wall of the excavation Photo 3: View of the north wall of the excavation Photo 4: View of the east wall of the excavation Photo 5: View of the west wall of the excavation Photo 6: View of stockpiled soil SOIL EXCAVATION PROJECT SHULSEN PROPERTY 10125 SOUTH 280 WEST SANDY, UTAH Project No. 271EM00873 Atlas Technical Services Photo 7: View of the excavated area prior to the start of the backfill effort Photo 8: View of excavation being cleared of debris before the start of the backfill effort Photo 9: View of the first lift backfill material being compacted Photo 10: View of the first lift compaction test being performed Photo 11: View of the second lift backfill material being compacted Photo 12: View of the second lift compaction test being performed SOIL EXCAVATION PROJECT SHULSEN PROPERTY 10125 SOUTH 280 WEST SANDY, UTAH Project No. 271EM00873 Atlas Technical Services Photo 13: View of the third lift backfill material being compacted Photo 14: View of the third lift compaction test being performed Photo 15: View of final lift of backfill material being placed in the excavation Photo 16: View of final layer of backfill material being compacted Photo 17: View of excavation after final lift compaction effort Photo 18: View facing north of the excavated area upon completion of the backfill effort APPENDIX B LABORATORY REPORTS ANALYTICAL REPORT November 14, 2024 One Atlas Sample Delivery Group:L1795497 Samples Received:11/05/2024 Project Number:271EM00873 Description:Shulsen Property Monroe St. Report To:Jim Coletta 1775 South 4130 West, Ste A Salt Lake City, UT 84104 Entire Report Reviewed By: November 14, 2024 [Preliminary Report] Daphne Richards Project Manager Results relate only to the items tested or calibrated and are reported as rounded values. This test report shall not be reproduced, except in full, without written approval of the laboratory. Where applicable, sampling conducted by Pace Analytical National is performed per guidance provided in laboratory standard operating procedures ENV-SOP-MTJL-0067 and ENV-SOP-MTJL-0068. Where sampling conducted by the customer, results relate to the accuracy of the information provided, and as the samples are received. Pace Analytical National 12065 Lebanon Rd Mount Juliet, TN 37122 615-758-5858 800-767-5859 mydata.pacelabs.com 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 1 of 25 November 14, 2024 Daphne Richards Project Manager ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 1 of 25 TABLE OF CONTENTS Cp: Cover Page 1 Tc: Table of Contents 2 Ss: Sample Summary 3 Cn: Case Narrative 5 Sr: Sample Results 6 NORTH WALL@8' L1795497-01 6 NORTH WALL@4' L1795497-02 7 WEST WALL@8' L1795497-03 8 WEST WALL@4' L1795497-04 9 SOUTH WALL@4' L1795497-05 10 SOUTH WALL@8' L1795497-06 11 EAST WALL@4' L1795497-07 12 EAST WALL@8 L1795497-08 13 STOCKPILE L1795497-09 14 CENTER FLOOR@8' L1795497-10 15 Qc: Quality Control Summary 16 Total Solids by Method 2540 G-2011 16 Volatile Organic Compounds (GC/MS) by Method 8260B 18 Semi-Volatile Organic Compounds (GC) by Method 8015 19 Gl: Glossary of Terms 21 Al: Accreditations & Locations 22 Sc: Sample Chain of Custody 23 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 2 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 2 of 25 SAMPLE SUMMARY Collected by Collected date/time Received date/time NORTH WALL@8' L1795497-01 Solid Jim Coletta 11/04/24 11:45 11/05/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Total Solids by Method 2540 G-2011 WG2395875 1 11/06/24 08:09 11/06/24 08:15 CMB Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2398901 1 11/07/24 18:13 11/09/24 22:32 JAH Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015 WG2396978 1 11/06/24 07:30 11/07/24 03:31 KKS Mt. Juliet, TN Collected by Collected date/time Received date/time NORTH WALL@4' L1795497-02 Solid Jim Coletta 11/04/24 11:53 11/05/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Total Solids by Method 2540 G-2011 WG2395875 1 11/06/24 08:09 11/06/24 08:15 CMB Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2398901 1.01 11/07/24 18:13 11/09/24 22:52 JAH Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015 WG2396256 1 11/06/24 08:05 11/06/24 21:27 SGB Mt. Juliet, TN Collected by Collected date/time Received date/time WEST WALL@8' L1795497-03 Solid Jim Coletta 11/04/24 11:59 11/05/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Total Solids by Method 2540 G-2011 WG2395875 1 11/06/24 08:09 11/06/24 08:15 CMB Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2398901 1.01 11/07/24 18:13 11/09/24 23:12 JAH Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015 WG2396256 1 11/06/24 08:05 11/06/24 19:49 SGB Mt. Juliet, TN Collected by Collected date/time Received date/time WEST WALL@4' L1795497-04 Solid Jim Coletta 11/04/24 12:05 11/05/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Total Solids by Method 2540 G-2011 WG2395875 1 11/06/24 08:09 11/06/24 08:15 CMB Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2398901 1 11/07/24 18:13 11/09/24 23:32 JAH Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015 WG2396256 1 11/06/24 08:05 11/07/24 11:39 SGB Mt. Juliet, TN Collected by Collected date/time Received date/time SOUTH WALL@4' L1795497-05 Solid Jim Coletta 11/04/24 12:16 11/05/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Total Solids by Method 2540 G-2011 WG2395877 1 11/06/24 08:24 11/06/24 08:30 CMB Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2398901 1.01 11/07/24 18:13 11/09/24 23:52 JAH Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015 WG2396256 1 11/06/24 08:05 11/07/24 11:53 SGB Mt. Juliet, TN Collected by Collected date/time Received date/time SOUTH WALL@8' L1795497-06 Solid Jim Coletta 11/04/24 12:10 11/05/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Total Solids by Method 2540 G-2011 WG2395877 1 11/06/24 08:24 11/06/24 08:30 CMB Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2398901 1 11/07/24 18:13 11/10/24 00:13 JAH Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015 WG2396256 1 11/06/24 08:05 11/06/24 20:59 SGB Mt. Juliet, TN 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 3 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 3 of 25 SAMPLE SUMMARY Collected by Collected date/time Received date/time EAST WALL@4' L1795497-07 Solid Jim Coletta 11/04/24 12:40 11/05/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Total Solids by Method 2540 G-2011 WG2395877 1 11/06/24 08:24 11/06/24 08:30 CMB Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2398901 1 11/07/24 18:13 11/10/24 00:33 JAH Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015 WG2396256 1 11/06/24 08:05 11/07/24 12:53 SGB Mt. Juliet, TN Collected by Collected date/time Received date/time EAST WALL@8 L1795497-08 Solid Jim Coletta 11/04/24 12:35 11/05/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Total Solids by Method 2540 G-2011 WG2395877 1 11/06/24 08:24 11/06/24 08:30 CMB Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2398901 1 11/07/24 18:13 11/10/24 00:53 JAH Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015 WG2396256 1 11/06/24 08:05 11/06/24 20:31 SGB Mt. Juliet, TN Collected by Collected date/time Received date/time STOCKPILE L1795497-09 Solid Jim Coletta 11/04/24 13:10 11/05/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Total Solids by Method 2540 G-2011 WG2395877 1 11/06/24 08:24 11/06/24 08:30 CMB Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2398901 1.01 11/07/24 18:13 11/10/24 01:13 JAH Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015 WG2396256 1 11/06/24 08:05 11/07/24 12:07 SGB Mt. Juliet, TN Collected by Collected date/time Received date/time CENTER FLOOR@8' L1795497-10 Solid Jim Coletta 11/04/24 12:24 11/05/24 08:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Total Solids by Method 2540 G-2011 WG2395877 1 11/06/24 08:24 11/06/24 08:30 CMB Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260B WG2398901 1.01 11/07/24 18:13 11/10/24 01:34 JAH Mt. Juliet, TN Semi-Volatile Organic Compounds (GC) by Method 8015 WG2396256 1 11/06/24 08:05 11/06/24 20:45 SGB Mt. Juliet, TN 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 4 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 4 of 25 CASE NARRATIVE All sample aliquots were received at the correct temperature, in the proper containers, with the appropriate preservatives, and within method specified holding times, unless qualified or notated within the report. Where applicable, all MDL (LOD) and RDL (LOQ) values reported for environmental samples have been corrected for the dilution factor used in the analysis. All Method and Batch Quality Control are within established criteria except where addressed in this case narrative, a non-conformance form or properly qualified within the sample results. By my digital signature below, I affirm to the best of my knowledge, all problems/anomalies observed by the laboratory as having the potential to affect the quality of the data have been identified by the laboratory, and no information or data have been knowingly withheld that would affect the quality of the data. [Preliminary Report] Daphne Richards Project Manager 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 5 of 25 Daphne Richards Project Manager ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 5 of 25 SAMPLE RESULTS - 01 L1795497 NORTH WALL@8' Collected date/time: 11/04/24 11:45 Total Solids by Method 2540 G-2011 Result Qualifier Dilution Analysis Batch Analyte %date / time Total Solids 98.8 1 11/06/2024 08:15 WG2395875 Volatile Organic Compounds (GC/MS) by Method 8260B Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time Benzene U 0.000478 0.00102 1 11/09/2024 22:32 WG2398901 Toluene 0.00251 B J 0.00133 0.00512 1 11/09/2024 22:32 WG2398901 Ethylbenzene U 0.000755 0.00256 1 11/09/2024 22:32 WG2398901 Xylenes, Total U 0.000901 0.00666 1 11/09/2024 22:32 WG2398901 Naphthalene 0.0184 0.00500 0.0128 1 11/09/2024 22:32 WG2398901 (S) Toluene-d8 103 75.0-131 11/09/2024 22:32 WG2398901 (S) 4-Bromofluorobenzene 94.9 67.0-138 11/09/2024 22:32 WG2398901 (S) 1,2-Dichloroethane-d4 103 70.0-130 11/09/2024 22:32 WG2398901 Semi-Volatile Organic Compounds (GC) by Method 8015 Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time TPH (GC/FID) High Fraction U 0.778 4.05 1 11/07/2024 03:31 WG2396978 (S) o-Terphenyl 52.6 18.0-148 11/07/2024 03:31 WG2396978 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 6 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 6 of 25 SAMPLE RESULTS - 02 L1795497 NORTH WALL@4' Collected date/time: 11/04/24 11:53 Total Solids by Method 2540 G-2011 Result Qualifier Dilution Analysis Batch Analyte %date / time Total Solids 96.5 1 11/06/2024 08:15 WG2395875 Volatile Organic Compounds (GC/MS) by Method 8260B Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time Benzene U 0.000506 0.00108 1.01 11/09/2024 22:52 WG2398901 Toluene 0.00309 B J 0.00140 0.00542 1.01 11/09/2024 22:52 WG2398901 Ethylbenzene U 0.000798 0.00271 1.01 11/09/2024 22:52 WG2398901 Xylenes, Total U 0.000953 0.00703 1.01 11/09/2024 22:52 WG2398901 Naphthalene U 0.00529 0.0135 1.01 11/09/2024 22:52 WG2398901 (S) Toluene-d8 104 75.0-131 11/09/2024 22:52 WG2398901 (S) 4-Bromofluorobenzene 94.9 67.0-138 11/09/2024 22:52 WG2398901 (S) 1,2-Dichloroethane-d4 101 70.0-130 11/09/2024 22:52 WG2398901 Semi-Volatile Organic Compounds (GC) by Method 8015 Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time TPH (GC/FID) High Fraction 1.51 J 0.797 4.15 1 11/06/2024 21:27 WG2396256 (S) o-Terphenyl 63.4 18.0-148 11/06/2024 21:27 WG2396256 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 7 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 7 of 25 SAMPLE RESULTS - 03 L1795497 WEST WALL@8' Collected date/time: 11/04/24 11:59 Total Solids by Method 2540 G-2011 Result Qualifier Dilution Analysis Batch Analyte %date / time Total Solids 98.2 1 11/06/2024 08:15 WG2395875 Volatile Organic Compounds (GC/MS) by Method 8260B Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time Benzene U 0.000489 0.00105 1.01 11/09/2024 23:12 WG2398901 Toluene 0.00170 B J 0.00136 0.00524 1.01 11/09/2024 23:12 WG2398901 Ethylbenzene U 0.000772 0.00262 1.01 11/09/2024 23:12 WG2398901 Xylenes, Total U 0.000922 0.00680 1.01 11/09/2024 23:12 WG2398901 Naphthalene U 0.00511 0.0131 1.01 11/09/2024 23:12 WG2398901 (S) Toluene-d8 103 75.0-131 11/09/2024 23:12 WG2398901 (S) 4-Bromofluorobenzene 93.3 67.0-138 11/09/2024 23:12 WG2398901 (S) 1,2-Dichloroethane-d4 101 70.0-130 11/09/2024 23:12 WG2398901 Semi-Volatile Organic Compounds (GC) by Method 8015 Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time TPH (GC/FID) High Fraction U 0.783 4.07 1 11/06/2024 19:49 WG2396256 (S) o-Terphenyl 68.3 18.0-148 11/06/2024 19:49 WG2396256 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 8 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 8 of 25 SAMPLE RESULTS - 04 L1795497 WEST WALL@4' Collected date/time: 11/04/24 12:05 Total Solids by Method 2540 G-2011 Result Qualifier Dilution Analysis Batch Analyte %date / time Total Solids 94.1 1 11/06/2024 08:15 WG2395875 Volatile Organic Compounds (GC/MS) by Method 8260B Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time Benzene U 0.000525 0.00113 1 11/09/2024 23:32 WG2398901 Toluene 0.00248 B J 0.00146 0.00563 1 11/09/2024 23:32 WG2398901 Ethylbenzene U 0.000829 0.00281 1 11/09/2024 23:32 WG2398901 Xylenes, Total U 0.000990 0.00731 1 11/09/2024 23:32 WG2398901 Naphthalene U 0.00549 0.0141 1 11/09/2024 23:32 WG2398901 (S) Toluene-d8 102 75.0-131 11/09/2024 23:32 WG2398901 (S) 4-Bromofluorobenzene 91.0 67.0-138 11/09/2024 23:32 WG2398901 (S) 1,2-Dichloroethane-d4 97.4 70.0-130 11/09/2024 23:32 WG2398901 Semi-Volatile Organic Compounds (GC) by Method 8015 Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time TPH (GC/FID) High Fraction 4.64 0.817 4.25 1 11/07/2024 11:39 WG2396256 (S) o-Terphenyl 54.1 18.0-148 11/07/2024 11:39 WG2396256 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 9 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 9 of 25 SAMPLE RESULTS - 05 L1795497 SOUTH WALL@4' Collected date/time: 11/04/24 12:16 Total Solids by Method 2540 G-2011 Result Qualifier Dilution Analysis Batch Analyte %date / time Total Solids 96.6 1 11/06/2024 08:30 WG2395877 Volatile Organic Compounds (GC/MS) by Method 8260B Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time Benzene U 0.000505 0.00108 1.01 11/09/2024 23:52 WG2398901 Toluene 0.00308 B J 0.00140 0.00540 1.01 11/09/2024 23:52 WG2398901 Ethylbenzene U 0.000796 0.00271 1.01 11/09/2024 23:52 WG2398901 Xylenes, Total U 0.000951 0.00702 1.01 11/09/2024 23:52 WG2398901 Naphthalene U 0.00528 0.0135 1.01 11/09/2024 23:52 WG2398901 (S) Toluene-d8 102 75.0-131 11/09/2024 23:52 WG2398901 (S) 4-Bromofluorobenzene 94.2 67.0-138 11/09/2024 23:52 WG2398901 (S) 1,2-Dichloroethane-d4 102 70.0-130 11/09/2024 23:52 WG2398901 Semi-Volatile Organic Compounds (GC) by Method 8015 Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time TPH (GC/FID) High Fraction 3.32 J 0.796 4.14 1 11/07/2024 11:53 WG2396256 (S) o-Terphenyl 58.8 18.0-148 11/07/2024 11:53 WG2396256 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 10 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 10 of 25 SAMPLE RESULTS - 06 L1795497 SOUTH WALL@8' Collected date/time: 11/04/24 12:10 Total Solids by Method 2540 G-2011 Result Qualifier Dilution Analysis Batch Analyte %date / time Total Solids 98.1 1 11/06/2024 08:30 WG2395877 Volatile Organic Compounds (GC/MS) by Method 8260B Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time Benzene U 0.000486 0.00104 1 11/10/2024 00:13 WG2398901 Toluene 0.00250 B J 0.00135 0.00520 1 11/10/2024 00:13 WG2398901 Ethylbenzene U 0.000766 0.00260 1 11/10/2024 00:13 WG2398901 Xylenes, Total U 0.000915 0.00676 1 11/10/2024 00:13 WG2398901 Naphthalene U 0.00507 0.0130 1 11/10/2024 00:13 WG2398901 (S) Toluene-d8 99.9 75.0-131 11/10/2024 00:13 WG2398901 (S) 4-Bromofluorobenzene 92.6 67.0-138 11/10/2024 00:13 WG2398901 (S) 1,2-Dichloroethane-d4 101 70.0-130 11/10/2024 00:13 WG2398901 Semi-Volatile Organic Compounds (GC) by Method 8015 Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time TPH (GC/FID) High Fraction U 0.784 4.08 1 11/06/2024 20:59 WG2396256 (S) o-Terphenyl 72.8 18.0-148 11/06/2024 20:59 WG2396256 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 11 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 11 of 25 SAMPLE RESULTS - 07 L1795497 EAST WALL@4' Collected date/time: 11/04/24 12:40 Total Solids by Method 2540 G-2011 Result Qualifier Dilution Analysis Batch Analyte %date / time Total Solids 93.9 1 11/06/2024 08:30 WG2395877 Volatile Organic Compounds (GC/MS) by Method 8260B Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time Benzene U 0.000527 0.00113 1 11/10/2024 00:33 WG2398901 Toluene 0.00305 B J 0.00147 0.00565 1 11/10/2024 00:33 WG2398901 Ethylbenzene U 0.000832 0.00282 1 11/10/2024 00:33 WG2398901 Xylenes, Total U 0.000994 0.00734 1 11/10/2024 00:33 WG2398901 Naphthalene U 0.00551 0.0141 1 11/10/2024 00:33 WG2398901 (S) Toluene-d8 101 75.0-131 11/10/2024 00:33 WG2398901 (S) 4-Bromofluorobenzene 91.9 67.0-138 11/10/2024 00:33 WG2398901 (S) 1,2-Dichloroethane-d4 99.7 70.0-130 11/10/2024 00:33 WG2398901 Semi-Volatile Organic Compounds (GC) by Method 8015 Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time TPH (GC/FID) High Fraction 11.7 0.819 4.26 1 11/07/2024 12:53 WG2396256 (S) o-Terphenyl 56.8 18.0-148 11/07/2024 12:53 WG2396256 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 12 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 12 of 25 SAMPLE RESULTS - 08 L1795497 EAST WALL@8 Collected date/time: 11/04/24 12:35 Total Solids by Method 2540 G-2011 Result Qualifier Dilution Analysis Batch Analyte %date / time Total Solids 95.9 1 11/06/2024 08:30 WG2395877 Volatile Organic Compounds (GC/MS) by Method 8260B Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time Benzene U 0.000507 0.00109 1 11/10/2024 00:53 WG2398901 Toluene 0.00226 B J 0.00141 0.00543 1 11/10/2024 00:53 WG2398901 Ethylbenzene U 0.000800 0.00272 1 11/10/2024 00:53 WG2398901 Xylenes, Total U 0.000956 0.00706 1 11/10/2024 00:53 WG2398901 Naphthalene U 0.00530 0.0136 1 11/10/2024 00:53 WG2398901 (S) Toluene-d8 102 75.0-131 11/10/2024 00:53 WG2398901 (S) 4-Bromofluorobenzene 96.6 67.0-138 11/10/2024 00:53 WG2398901 (S) 1,2-Dichloroethane-d4 102 70.0-130 11/10/2024 00:53 WG2398901 Semi-Volatile Organic Compounds (GC) by Method 8015 Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time TPH (GC/FID) High Fraction U 0.802 4.17 1 11/06/2024 20:31 WG2396256 (S) o-Terphenyl 70.8 18.0-148 11/06/2024 20:31 WG2396256 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 13 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 13 of 25 SAMPLE RESULTS - 09 L1795497 STOCKPILE Collected date/time: 11/04/24 13:10 Total Solids by Method 2540 G-2011 Result Qualifier Dilution Analysis Batch Analyte %date / time Total Solids 95.2 1 11/06/2024 08:30 WG2395877 Volatile Organic Compounds (GC/MS) by Method 8260B Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time Benzene U 0.000520 0.00111 1.01 11/10/2024 01:13 WG2398901 Toluene 0.00272 B J 0.00144 0.00556 1.01 11/10/2024 01:13 WG2398901 Ethylbenzene U 0.000819 0.00279 1.01 11/10/2024 01:13 WG2398901 Xylenes, Total U 0.000979 0.00722 1.01 11/10/2024 01:13 WG2398901 Naphthalene U 0.00543 0.0139 1.01 11/10/2024 01:13 WG2398901 (S) Toluene-d8 106 75.0-131 11/10/2024 01:13 WG2398901 (S) 4-Bromofluorobenzene 94.3 67.0-138 11/10/2024 01:13 WG2398901 (S) 1,2-Dichloroethane-d4 102 70.0-130 11/10/2024 01:13 WG2398901 Semi-Volatile Organic Compounds (GC) by Method 8015 Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time TPH (GC/FID) High Fraction 3.53 J 0.808 4.20 1 11/07/2024 12:07 WG2396256 (S) o-Terphenyl 63.2 18.0-148 11/07/2024 12:07 WG2396256 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 14 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 14 of 25 SAMPLE RESULTS - 10 L1795497 CENTER FLOOR@8' Collected date/time: 11/04/24 12:24 Total Solids by Method 2540 G-2011 Result Qualifier Dilution Analysis Batch Analyte %date / time Total Solids 94.5 1 11/06/2024 08:30 WG2395877 Volatile Organic Compounds (GC/MS) by Method 8260B Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time Benzene U 0.000527 0.00113 1.01 11/10/2024 01:34 WG2398901 Toluene 0.00251 B J 0.00146 0.00564 1.01 11/10/2024 01:34 WG2398901 Ethylbenzene U 0.000831 0.00283 1.01 11/10/2024 01:34 WG2398901 Xylenes, Total U 0.000993 0.00733 1.01 11/10/2024 01:34 WG2398901 Naphthalene U 0.00551 0.0141 1.01 11/10/2024 01:34 WG2398901 (S) Toluene-d8 102 75.0-131 11/10/2024 01:34 WG2398901 (S) 4-Bromofluorobenzene 97.1 67.0-138 11/10/2024 01:34 WG2398901 (S) 1,2-Dichloroethane-d4 103 70.0-130 11/10/2024 01:34 WG2398901 Semi-Volatile Organic Compounds (GC) by Method 8015 Result (dry)Qualifier MDL (dry)RDL (dry)Dilution Analysis Batch Analyte mg/kg mg/kg mg/kg date / time TPH (GC/FID) High Fraction U 0.814 4.23 1 11/06/2024 20:45 WG2396256 (S) o-Terphenyl 70.2 18.0-148 11/06/2024 20:45 WG2396256 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 15 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 15 of 25 QUALITY CONTROL SUMMARYWG2395875 Total Solids by Method 2540 G-2011 L1795497-01,02,03,04 Method Blank (MB) (MB) R4142732-1 11/06/24 08:15 MB Result MB Qualifier MB MDL MB RDL Analyte %%% Total Solids 0.000 L1795437-02 Original Sample (OS) • Duplicate (DUP) (OS) L1795437-02 11/06/24 08:15 • (DUP) R4142732-3 11/06/24 08:15 Original Result DUP Result Dilution DUP RPD DUP Qualifier DUP RPD Limits Analyte %%%% Total Solids 99.5 99.1 1 0.404 10 Laboratory Control Sample (LCS) (LCS) R4142732-2 11/06/24 08:15 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte %%%% Total Solids 50.0 50.0 100 90.0-110 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 16 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 16 of 25 QUALITY CONTROL SUMMARYWG2395877 Total Solids by Method 2540 G-2011 L1795497-05,06,07,08,09,10 Method Blank (MB) (MB) R4142738-1 11/06/24 08:30 MB Result MB Qualifier MB MDL MB RDL Analyte %%% Total Solids 0.000 L1795497-09 Original Sample (OS) • Duplicate (DUP) (OS) L1795497-09 11/06/24 08:30 • (DUP) R4142738-3 11/06/24 08:30 Original Result DUP Result Dilution DUP RPD DUP Qualifier DUP RPD Limits Analyte %%%% Total Solids 95.2 95.9 1 0.765 10 Laboratory Control Sample (LCS) (LCS) R4142738-2 11/06/24 08:30 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte %%%% Total Solids 50.0 50.0 100 90.0-110 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 17 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 17 of 25 QUALITY CONTROL SUMMARYWG2398901 Volatile Organic Compounds (GC/MS) by Method 8260B L1795497-01,02,03,04,05,06,07,08,09,10 Method Blank (MB) (MB) R4146006-3 11/09/24 20:20 MB Result MB Qualifier MB MDL MB RDL Analyte mg/kg mg/kg mg/kg Benzene U 0.000467 0.00100 Toluene 0.00243 J 0.00130 0.00500 Ethylbenzene U 0.000737 0.00250 Xylenes, Total U 0.000880 0.00650 Naphthalene U 0.00488 0.0125 (S) Toluene-d8 105 75.0-131 (S) 4-Bromofluorobenzene 96.8 67.0-138 (S) 1,2-Dichloroethane-d4 98.5 70.0-130 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R4146006-1 11/09/24 18:39 • (LCSD) R4146006-2 11/09/24 18:59 Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits Analyte mg/kg mg/kg mg/kg %%%%% Benzene 0.125 0.121 0.121 96.8 96.8 70.0-123 0.000 20 Toluene 0.125 0.125 0.123 100 98.4 75.0-121 1.61 20 Ethylbenzene 0.125 0.124 0.124 99.2 99.2 74.0-126 0.000 20 Xylenes, Total 0.375 0.371 0.367 98.9 97.9 72.0-127 1.08 20 Naphthalene 0.125 0.118 0.125 94.4 100 59.0-130 5.76 20 (S) Toluene-d8 99.4 99.6 75.0-131 (S) 4-Bromofluorobenzene 94.8 95.9 67.0-138 (S) 1,2-Dichloroethane-d4 102 100 70.0-130 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 18 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 18 of 25 QUALITY CONTROL SUMMARYWG2396256 Semi-Volatile Organic Compounds (GC) by Method 8015 L1795497-02,03,04,05,06,07,08,09,10 Method Blank (MB) (MB) R4143103-1 11/06/24 19:20 MB Result MB Qualifier MB MDL MB RDL Analyte mg/kg mg/kg mg/kg TPH (GC/FID) High Fraction U 0.769 4.00 (S) o-Terphenyl 75.1 18.0-148 Laboratory Control Sample (LCS) (LCS) R4143103-2 11/06/24 19:35 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte mg/kg mg/kg %% TPH (GC/FID) High Fraction 50.0 42.2 84.4 50.0-150 (S) o-Terphenyl 80.8 18.0-148 L1795497-03 Original Sample (OS) • Matrix Spike (MS) • Matrix Spike Duplicate (MSD) (OS) L1795497-03 11/06/24 19:49 • (MS) R4143103-3 11/06/24 20:03 • (MSD) R4143103-4 11/06/24 20:17 Spike Amount (dry) Original Result (dry)MS Result (dry)MSD Result (dry)MS Rec.MSD Rec.Dilution Rec. Limits MS Qualifier MSD Qualifier RPD RPD Limits Analyte mg/kg mg/kg mg/kg mg/kg %%%%% TPH (GC/FID) High Fraction 49.1 U 36.2 37.5 73.7 76.2 1 50.0-150 3.60 20 (S) o-Terphenyl 67.0 70.5 18.0-148 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 19 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 19 of 25 QUALITY CONTROL SUMMARYWG2396978 Semi-Volatile Organic Compounds (GC) by Method 8015 L1795497-01 Method Blank (MB) (MB) R4143086-1 11/06/24 19:15 MB Result MB Qualifier MB MDL MB RDL Analyte mg/kg mg/kg mg/kg TPH (GC/FID) High Fraction U 0.769 4.00 (S) o-Terphenyl 55.9 18.0-148 Laboratory Control Sample (LCS) (LCS) R4143086-2 11/06/24 19:29 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte mg/kg mg/kg %% TPH (GC/FID) High Fraction 50.0 33.9 67.8 50.0-150 (S) o-Terphenyl 69.8 18.0-148 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 20 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 20 of 25 GLOSSARY OF TERMS Guide to Reading and Understanding Your Laboratory Report The information below is designed to better explain the various terms used in your report of analytical results from the Laboratory. This is not intended as a comprehensive explanation, and if you have additional questions please contact your project representative. Results Disclaimer - Information that may be provided by the customer, and contained within this report, include Permit Limits, Project Name, Sample ID, Sample Matrix, Sample Preservation, Field Blanks, Field Spikes, Field Duplicates, On-Site Data, Sampling Collection Dates/Times, and Sampling Location. Results relate to the accuracy of this information provided, and as the samples are received. Abbreviations and Definitions (dry)Results are reported based on the dry weight of the sample. [this will only be present on a dry report basis for soils]. MDL Method Detection Limit. MDL (dry)Method Detection Limit. RDL Reported Detection Limit. RDL (dry)Reported Detection Limit. Rec.Recovery. RPD Relative Percent Difference. SDG Sample Delivery Group. (S) Surrogate (Surrogate Standard) - Analytes added to every blank, sample, Laboratory Control Sample/Duplicate and Matrix Spike/Duplicate; used to evaluate analytical efficiency by measuring recovery. Surrogates are not expected to be detected in all environmental media. U Not detected at the Reporting Limit (or MDL where applicable). Analyte The name of the particular compound or analysis performed. Some Analyses and Methods will have multiple analytes reported. Dilution If the sample matrix contains an interfering material, the sample preparation volume or weight values differ from the standard, or if concentrations of analytes in the sample are higher than the highest limit of concentration that the laboratory can accurately report, the sample may be diluted for analysis. If a value different than 1 is used in this field, the result reported has already been corrected for this factor. Limits These are the target % recovery ranges or % difference value that the laboratory has historically determined as normal for the method and analyte being reported. Successful QC Sample analysis will target all analytes recovered or duplicated within these ranges. Original Sample The non-spiked sample in the prep batch used to determine the Relative Percent Difference (RPD) from a quality control sample. The Original Sample may not be included within the reported SDG. Qualifier This column provides a letter and/or number designation that corresponds to additional information concerning the result reported. If a Qualifier is present, a definition per Qualifier is provided within the Glossary and Definitions page and potentially a discussion of possible implications of the Qualifier in the Case Narrative if applicable. Result The actual analytical final result (corrected for any sample specific characteristics) reported for your sample. If there was no measurable result returned for a specific analyte, the result in this column may state “ND” (Not Detected) or “BDL” (Below Detectable Levels). The information in the results column should always be accompanied by either an MDL (Method Detection Limit) or RDL (Reporting Detection Limit) that defines the lowest value that the laboratory could detect or report for this analyte. Uncertainty (Radiochemistry)Confidence level of 2 sigma. Case Narrative (Cn) A brief discussion about the included sample results, including a discussion of any non-conformances to protocol observed either at sample receipt by the laboratory from the field or during the analytical process. If present, there will be a section in the Case Narrative to discuss the meaning of any data qualifiers used in the report. Quality Control Summary (Qc) This section of the report includes the results of the laboratory quality control analyses required by procedure or analytical methods to assist in evaluating the validity of the results reported for your samples. These analyses are not being performed on your samples typically, but on laboratory generated material. Sample Chain of Custody (Sc) This is the document created in the field when your samples were initially collected. This is used to verify the time and date of collection, the person collecting the samples, and the analyses that the laboratory is requested to perform. This chain of custody also documents all persons (excluding commercial shippers) that have had control or possession of the samples from the time of collection until delivery to the laboratory for analysis. Sample Results (Sr) This section of your report will provide the results of all testing performed on your samples. These results are provided by sample ID and are separated by the analyses performed on each sample. The header line of each analysis section for each sample will provide the name and method number for the analysis reported. Sample Summary (Ss)This section of the Analytical Report defines the specific analyses performed for each sample ID, including the dates and times of preparation and/or analysis. Qualifier Description B The same analyte is found in the associated blank. J The identification of the analyte is acceptable; the reported value is an estimate. 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 21 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 21 of 25 Pace Analytical National 12065 Lebanon Rd Mount Juliet, TN 37122 Alabama 40660 Nebraska NE-OS-15-05 Alaska 17-026 Nevada TN000032021-1 Arizona AZ0612 New Hampshire 2975 Arkansas 88-0469 New Jersey–NELAP TN002 California 2932 New Mexico ¹TN00003 Colorado TN00003 New York 11742 Connecticut PH-0197 North Carolina Env375 Florida E87487 North Carolina ¹DW21704 Georgia NELAP North Carolina ³41 Georgia ¹923 North Dakota R-140 Idaho TN00003 Ohio–VAP CL0069 Illinois 200008 Oklahoma 9915 Indiana C-TN-01 Oregon TN200002 Iowa 364 Pennsylvania 68-02979 Kansas E-10277 Rhode Island LAO00356 Kentucky ¹ ⁶KY90010 South Carolina 84004002 Kentucky ²16 South Dakota n/a Louisiana AI30792 Tennessee ¹ ⁴2006 Louisiana LA018 Texas T104704245-20-18 Maine TN00003 Texas ⁵LAB0152 Maryland 324 Utah TN000032021-11 Massachusetts M-TN003 Vermont VT2006 Michigan 9958 Virginia 110033 Minnesota 047-999-395 Washington C847 Mississippi TN00003 West Virginia 233 Missouri 340 Wisconsin 998093910 Montana CERT0086 Wyoming A2LA A2LA – ISO 17025 1461.01 AIHA-LAP,LLC EMLAP 100789 A2LA – ISO 17025 ⁵1461.02 DOD 1461.01 Canada 1461.01 USDA P330-15-00234 EPA–Crypto TN00003 ACCREDITATIONS & LOCATIONS ¹ Drinking Water ² Underground Storage Tanks ³ Aquatic Toxicity ⁴ Chemical/Microbiological ⁵ Mold ⁶ Wastewater n/a Accreditation not applicable * Not all certifications held by the laboratory are applicable to the results reported in the attached report. * Accreditation is only applicable to the test methods specified on each scope of accreditation held by Pace Analytical. 1 Cp 2 Tc 3 Ss 4 Cn 5 Sr 6 Qc 7 Gl 8 Al 9 Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 22 of 25 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: One Atlas 271EM00873 L1795497 11/14/24 15:02 22 of 25 APPENDIX C SOIL DISPOSAL DOCUMENTATION and SOIL COMPACTION REPORT SALT LAKE VALLEY SOLID WASTE MANAGEMENT FACILITY TO: Attention: One Atlas Jim Coletta: (801 935-4917) Hauler: Direct Push Services Chad Russell (801 372-3587) FROM: Tom Burrup DETAIL: JOB # 286 ACCOUNT # 527 DATE: November 26, 2024 EXPIRES: December 20, 2024 RE: Former Shulsen Property Project - - - - - - - - - - - - - - - - - - - - - - - - - - - Clean Fill 10125 South Monroe St. Sandy, UT ---------------------------------------------------- 110 Tons est. Heating Oil UST Soil NO CHARGE MESSAGE: Hello Jim / Chad, The Salt Lake Valley Landfill (Landfill) has reviewed the information that was provided. Based on the analytical data, the Salt Lake Valley Landfill will accept this soil from the Former Shulsen Property. Clean Fill is NO CHARGE. Please keep the following important information in mind: • Landfill gates open at 7:00 am and gates close at 5:00 pm Monday through Saturday. • Clean Fill Loads accepted 6 days/week from 7:00 am to 5:00 pm – weather dependant. Call 385 468-6383 to inquire if loads are being accepted on or after wet, inclement weather.. • Loads must be physically clean & dry..!! Loads that are wet or contain foliage, boulders, cement, asphalt, pipe, wood, brick, or trash, do not meet our clean fill definition. Loads that contain unapproved material are at best Cover Fill ($12/ton), but may be garbage loads charged at $34.00/ton. No mud or muck. • Driver(s) must present a physical copy of this letter to the Landfill scalehouse attendant with each load. If you have any questions or need any additional information, please let me know. This letter serves as your acceptance document. Regards, Attention Scalehouse: tmb Please contact inspector to direct load to tipping face for disposal. Clean Fill - - - - - - - - - - - - - - - - - - - - - - - - - - 110 Tons Tom Burrup Council Members Scott Baird Salt Lake County Chris Bell Salt Lake City Joe Smolka Mayor, Emigration Township Council of Governments Dorothy Adams Salt Lake County Health Department Brent Beardall Technical Expert 6030 West California Ave (1400 South) Salt Lake City, Utah 84104 (385) 468-6370 http://slco.org/landfill/ Patrick Craig Executive Director John (Yianni) Ioannou Division Director 247181Project #: Direct Push Services, LLC (O) 10125 S 280 W, Sandy, UT Atlas Location: Project: Client:Report Date:12/10/2024 Weather:Sunny 12/10/2024Plans Dated:X N/AYesNoPlans Available: Contact:Dusty Temp. Range:32 Design Professional: RFI Dated:RFI No:X N/AYesNoRFI Available: Sheets/Details: Contractor:Direct Push Applicable Codes:IBC FIELD DATA Earthtec Engineering was on site as scheduled to perform in place moisture/density soil testing. The Contractor placed roadbase as backfill and compacted the material using a sheep's foot. The material appeared to be moisture conditioned prior to compaction. Earthtec arrived on site as scheduled. Contractor elected to cancel services on site. COMMENTS The work was observed or monitored by our personnel and found to be: Non-ConformingXConforming Work In Progress X Final Follow-up Visit Required RFI (Request For Information) INSPECTION RESULTS AND NON CONFORMANCE Report Copied to: Chad Russell, Chad, Maureen Remarks: Tim Taeger with GSH was on site for observation, had to wait for each lift to be done. Notes: As requested, a representative from our company arrived on site as scheduled and performed the above test. These test results apply only to the specific locations noted and do not represent any other location. Reports may not be reproduced except in full, without permission. Earthtec Engineering Troy Clarke Date Signed: 12/12/2024 11:08 AM Representative/Inspector: Jared Grammer Soil Compaction Report 001Report #: Page 1 of 2 840 West 1700 South, #10 | Salt Lake City | UT | 84106 801-225-5711 www.earthteceng.com 247181Project #: Direct Push Services, LLC (O) 10125 S 280 W, Sandy, UT Atlas Location: Project: Client:Report Date:12/10/2024 General Location:Excavation site Test Method:ASTM D-6938 (Nuclear) Project Specifications:Modified Proctor (ASTM D-1557) Retest Required: FIELD COMPACTION TESTING DATA Vertical Reference: Gauge Make:Troxler Gauge Model:3430 Gauge S/N:28460 Gauge Std Counts D 1535 M 661 Gauge Calibration Date:08/23/2024 PROCTORS Test Date Proctor #Test Procedure Soil Description Max. Dry Density (pcf) Optimum Moisture (%) 08/23/2024 24PIT-117 (Beef Hollow Pit) D 1 1/2" Commercial Roadbase (08-23-2024)114.9 10.4 FIELD TESTS Test #Date Test Elevation Location Depth (in) Water Content (%)Density (lbs/ft^3)% Compaction % Required Pass/ Fail Comments Field Opt.Wet Dry Max. 001 12/10/2024 -5' FG Middle of excavation 8.00 9.70 10.40 123.80 112.90 114.90 98.30 96.0 PASS 002 12/10/2024 -3' FG Middle of excavation 8.00 8.20 10.40 121.30 112.10 114.90 98.00 96.0 PASS 003 12/10/2024 -1' FG Middle of excavation 8.00 8.00 10.40 119.60 110.70 114.90 96.30 96.0 PASS 004 12/10/2024 Final Grade Middle of excavation 8.00 7.50 10.40 121.00 112.60 114.90 98.00 96.0 PASS Soil Compaction Report 001Report #: Page 2 of 2 840 West 1700 South, #10 | Salt Lake City | UT | 84106 801-225-5711 www.earthteceng.com