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Home My WebLink About27013_Cleveland Ave Homes_Sub-Slab Vapor Assessment Report 20230518Sub-Slab Vapor Assessment Report Cleveland Avenue Homes Winston Salem, North Carolina H&H Job No. MBS-002 May 18, 2023 C-1269 Engineering C-245 Geology i https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/mccormack baron salazar (mbs)/mbs-002 cleveland avenue homes/sub-slab vapor assessment/report/sub-slab vapor sampling report - cleveland avenue homes (5-18-23) 2.doc Sub-Slab Vapor Assessment Report Cleveland Avenue Homes Winston Salem, North Carolina H&H Job No. MBS-002 Table of Contents 1.0 Introduction and Background ...............................................................................................1 2.0 Sub-Slab Vapor Assessment Activities..................................................................................5 2.1 Sub-Slab Vapor Point Installation and Sampling ..................................................................5 2.2 Quality Assurance/Quality Control Samples .........................................................................7 2.3 Sub-Slab Vapor Sampling Results ........................................................................................8 3.0 Summary, Conclusions, and Recommendations ................................................................10 List of Tables Table 1 Summary of Soil Gas Analytical Data (2022) Table 2 Summary of Sub-Slab Vapor Analytical Data (2023) List of Figures Figure 1 Site Location Map Figure 2 Site Map Figure 3 Sub-Slab Vapor Sample Location Map List of Appendices Appendix A Sub-Slab Vapor Sampling Forms Appendix B Laboratory Analytical Report Appendix C DEQ Risk Calculator Input/Output Forms 1 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/mccormack baron salazar (mbs)/mbs-002 cleveland avenue homes/sub-slab vapor assessment/report/sub-slab vapor sampling report - cleveland avenue homes (5-18-23) 2.doc Sub-Slab Vapor Assessment Report Cleveland Avenue Homes N. Cleveland Avenue Winston Salem, North Carolina H&H Job No. MBS-002 1.0 Introduction and Background On behalf of McCormack Baron Salazar Development, Inc. (MBSDI), the Prospective Developer (PD), Hart & Hickman, PC (H&H) is pleased to present this Sub-Slab Vapor Assessment Report for the Cleveland Avenue Homes property located along N. Cleveland Avenue, New Hope Lane, E. 17th Street, E. 15th Street, and Woodland Avenue in Winston-Salem, Forsyth County, North Carolina (Site). Specifically, the two Site buildings included in this assessment are located at 924 and 926 New Hope Lane and 928, 930, and 932 New Hope Lane. Both structures are located on Forsythe County Parcel Identification Number (PIN) 6836-53-8315, which is in the northwestern portion of the Site. A Site location map is provided as Figure 1. The Site consists of ±66 parcels of land that total approximately 20 acres. The Site is developed with numerous multi-family apartment buildings and ancillary structures that were constructed during the 1940s and 1950s. A Site map that depicts the current Site buildings is included as Figure 2. Planned redevelopment of the Brownfields property by the PD includes construction of a multi- family community as part of the Winston-Salem Choice Neighborhoods Initiative (CNI). The community will consist of a leasing office, 27 multi-family apartment buildings and one building for senior residents, outdoor amenity areas, parking areas, and associated access roads. A summary of previous Phase I and II Environmental Site Assessment (ESA) activities completed at the Site is provided below. 2020 Phase I Environmental Site Assessment (ESA) H&H reviewed a Phase I ESA report that was prepared for the Site by Kimley Horn and Associates, Inc. (Kimley Horn) and dated August 17, 2020. Kimley Horn identified the 2 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/mccormack baron salazar (mbs)/mbs-002 cleveland avenue homes/sub-slab vapor assessment/report/sub-slab vapor sampling report - cleveland avenue homes (5-18-23) 2.doc following Recognized Environmental Conditions (RECs): • A 1950 Sanborn fire insurance map depicts a former dry cleaner located adjacent to the south and topographically upgradient of the Site at 1105 E. 14th Street. • A former dry cleaner was listed in an environmental database report at 1400 N. Liberty Street, which is located approximately 250 ft southwest and topographically upgradient of the Site. • A former gas station was located approximately 100 ft southwest and topographically upgradient of the Site at 1501 N. Liberty Street and is listed on the Underground Storage Tank (UST) and Leaking UST (LUST) databases. • A former dry cleaner was listed in city directories at 1501 N. Liberty Street, which is located adjacent to the west and topographically upgradient of the Site. • Sanborn fire insurance maps depict a dry cleaner located adjacent to the west and topographically upgradient of the Site at 1407 N. Liberty Street. The facility was also observed during Kimley Horn’s Site reconnaissance. • An automotive painting facility was listed at 1509 N. Liberty Street (adjacent to the west and upgradient of the Site) in city directories dated 1920 and 1925. • Current and former gas stations were identified at 1727 N. Liberty Street and 1522 N. Liberty Street, which are located west and topographically upgradient of the Site. • A funeral home located adjacent to the west and topographically upgradient of the Site at 1609 N. Liberty Street operated a gasoline UST for approximately 34 years. In addition, there is potential for soil impacts from the demolition of former residences on the Site which may have contained asbestos-containing materials and lead-based paint. Further, the former residences may have been heated with coal and/or fuel oil. 2022/2023 Phase II ESA Activities In October 2022 and February 2023, H&H conducted Phase II ESA soil, groundwater, and soil gas sampling at the Site to evaluate the RECs identified above. A summary of the analytical results is provided below. 3 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/mccormack baron salazar (mbs)/mbs-002 cleveland avenue homes/sub-slab vapor assessment/report/sub-slab vapor sampling report - cleveland avenue homes (5-18-23) 2.doc • Soil – No volatile organic compounds (VOCs) or semi-VOCs (SVOCs) were detected in soil at concentrations above the Residential or Protection of Groundwater Preliminary Soil Remediation Goals (PSRGs). No asbestos was detected at concentrations exceeding the laboratory method detection limits (MDLs). Low levels of several metals, including arsenic, barium, cadmium, chromium, lead, mercury, selenium, and silver, were detected above laboratory MDLs in shallow, intermediate, and deeper soil samples. The results of the risk calculations using combined Site soil data indicate that the calculated cumulative risks are below North Carolina Department of Environmental Quality (DEQ) acceptable risk levels for the residential and construction worker exposure scenarios. Risk levels are primarily driven by detections of arsenic, which are with the range of regional background levels. • Groundwater – Laboratory analytical results indicate the presence of several petroleum- related VOCs and SVOCs in sample MW-4 at concentrations above the North Carolina 2L Groundwater Standards (2L Standards) and the Vapor Intrusion Residential Groundwater Screening Levels (GWSLs). The petroleum-related impacts in MW-4 appear to be related to a release at one or more gas station/automotive repair facilities located upgradient to the southwest/west of the Site. Tetrachloroethylene (PCE) was detected in one groundwater sample collected at the Site MW-3 at a concentration above the 2L Standard but below the Residential GWSL. The PCE impacts in groundwater appear to be related to a solvent release at one or more former dry-cleaning facilities or automotive facilities located west/southwest of the Site. Petroleum-related VOCs and PCE were detected in sample MW-6 at concentrations above the 2L Standards, and benzene, 1,2-dichloroethane, naphthalene, and xylenes were detected in MW-6 at concentrations above the Residential GWSLs. These impacts appear to be related to releases at one or more current or former gas station, automotive repair, and dry-cleaning facilities located upgradient to the west/southwest of the Site and related to detections in MW-3 and MW-4. In the eastern portion of the Site, benzene was detected in sample MW-10 at a concentration above the 2L Standard and the Residential GWSL suggesting an off-Site-sourced VOC plume across the majority of the Site. 4 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/mccormack baron salazar (mbs)/mbs-002 cleveland avenue homes/sub-slab vapor assessment/report/sub-slab vapor sampling report - cleveland avenue homes (5-18-23) 2.doc Based on the highest concentrations of petroleum-related compounds in the western (upgradient) portion of the Site, the lack of known on-Site sources of petroleum or chlorinated compounds, and the presence of former drycleaners and current/former gas stations and automotive service facilities to the west (upgradient) of the Site, the VOCs and SVOCs detected in on-Site monitoring wells appear to be sourced from off-Site facilities. • Soil Gas – Various VOCs including chloroform, benzene, 1,3-butadiene, and naphthalene were detected in one or more samples at concentrations that exceed the Residential SGSLs. Trichloroethene (TCE) was not detected in the soil gas samples at concentrations above the laboratory MDLs. Although the calculated carcinogenic and non-carcinogenic risks using shallow soil gas data are below the DEQ acceptable risk levels for a residential exposure scenario, MBS intends to install vapor intrusion mitigation systems (VIMS) as a conservative measure to protect future residents from potential exposure to low-level VOCs and naturally occurring radon. October 2022 soil gas data are summarized on Table 1. On behalf of MBSDI, H&H submitted a Brownfields Property Application (BPA) to DEQ in March 2023 requesting eligibility to participate in the Brownfields Program. Brownfields eligibility and assignment of a DEQ Brownfields Project Manager is pending. While awaiting Brownfields eligibility and assignment of a Brownfields Project Manager, H&H conducted limited sub-slab vapor assessment activities at two existing Site buildings with slab-on-grade foundations located in the northwestern portion of the Site prior to demolition. The remaining Site buildings have crawl spaces; therefore, no assessment was performed in those buildings. The sub-slab vapor sampling activities are detailed in the sections below. 5 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/mccormack baron salazar (mbs)/mbs-002 cleveland avenue homes/sub-slab vapor assessment/report/sub-slab vapor sampling report - cleveland avenue homes (5-18-23) 2.doc 2.0 Sub-Slab Vapor Assessment Activities The assessment activities were performed in accordance with DEQ’s Inactive Hazardous Sites Branch (IHSB) Guidelines for Assessment and Cleanup of Contaminated Sites (Guidelines) dated September 2022, the DEQ Division of Waste Management (DWM) Vapor Intrusion Guidance (VI Guidance) dated March 2018, and most recent versions of the U.S. Environmental Protection Agency (EPA) Region IV Lab Services and Applied Sciences Division (LSASD) Field Branches Quality System and Technical Procedures guidance. Prior to conducting field activities, H&H contacted North Carolina 811, the public utility locator, to mark subsurface utilities located on the Site. H&H also contracted with a private utility locator to screen the proposed sub-slab vapor sampling locations for subgrade utilities and rebar. 2.1 Sub-Slab Vapor Point Installation and Sampling On April 11, 2023, H&H installed four sub-slab vapor sampling points (SSV-1 through SSV-4) within two of the Fairview Apartment buildings located on the northwestern portion of the Site. Samples SSV-1 and SSV-2 were collected within the building at 924-926 New Hope Lane, and samples SSV-3 and SSV-4 were collected within the building at 928-932 New Hope Lane. The sub-slab vapor sample locations are shown on Figure 3. The sub-slab vapor sampling points were installed using Cox Colvin Vapor Pin™ kits. To install the vapor pins, H&H employed a hammer drill equipped with a 5/8-inch diameter bit to advance a borehole through the concrete slab and approximately 6 inches into the underlying soil or gravel. Following borehole advancement, loose cuttings were removed, and a Vapor Pin™ assembly (brass sampling point and VOC-free silicone sleeve) was tapped into place using the Cox Colvin installation/extraction tool and a dead blow hammer to form an air-tight seal. Teflon® sample tubing was then secured to the barbed end of the Vapor Pin™ assembly. Prior to sample collection, a “shut-in” test was conducted on the sampling train for each sample. The purpose of the shut-in test was to ensure that short circuiting with ambient air did not occur 6 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/mccormack baron salazar (mbs)/mbs-002 cleveland avenue homes/sub-slab vapor assessment/report/sub-slab vapor sampling report - cleveland avenue homes (5-18-23) 2.doc during sampling. The shut-in test was conducted by connecting the laboratory-supplied flow regulator with vacuum gauge to the laboratory-supplied batch-certified 1.4-liter stainless steel Summa® canister and sealing the flow regulator with the laboratory provided brass cap. Once the sampling train was “closed”, the sample valve on the Summa® canister was opened and the reading on the vacuum gauge was recorded. The Summa® canister sample valve was then closed, and the vacuum gauge was observed to ensure no vacuum loss occurred. Vacuum readings remained stable indicating that no leaks were present in the connections from the regulators to the Summa® canisters. A copy of the shut-in test field form is provided in Appendix A. Each sub-slab vapor sampling point was allowed to equilibrate overnight prior to sample collection. The next morning, a laboratory-supplied batch-certified 1.4-liter stainless steel Summa sample canister was connected to an in-line flow controller with a vacuum gauge, and then the flow controller was connected to the tubing using a brass nut and ferrule assembly to form an air-tight seal. The flow regulator was pre-set by the laboratory to regulate the vapor intake rate to approximately 100 milliliters per minute. Vacuum in the Summa canister was measured prior to use to ensure the initial vacuum was not is excess of 10% lower than the vacuum documented by the laboratory upon shipment. Prior to collection of the sub-slab vapor samples, leak checks were conducted by constructing a shroud around the sample train at each sampling point and flooding the air within the shroud with helium gas. Helium concentrations inside the shroud were measured using a calibrated helium gas detector and maintained at concentrations not less than 10% for the duration of the leak check. Using a syringe and three-way valve, a minimum of three sample train volumes of air were purged from the Teflon sample tubing and a sample was collected from the sample tubing outside the shroud into a Tedlar bag and analyzed using the helium gas detector to ensure that helium concentrations were less than 10% of the helium concentrations measured within the shroud. SSV-1 through SSV-4 passed the helium leak checks. Field forms which document sub- slab vapor point installation and helium leak checks are provided in Appendix A. Following a successful leak check, the intake valve on the Summa canister was fully opened to begin collection of each sub-slab vapor sample. Vacuum readings on the Summa canister were 7 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/mccormack baron salazar (mbs)/mbs-002 cleveland avenue homes/sub-slab vapor assessment/report/sub-slab vapor sampling report - cleveland avenue homes (5-18-23) 2.doc recorded prior to and following the sampling period to ensure adequate sample volume was collected. A vacuum of approximately -5 inches mercury was maintained within the canisters at the conclusion of the sampling event. After sample collection, the intake valve on the Summa canister was closed, and the regulator was disconnected from the canister. The starting and ending vacuum in each canister was recorded on the chain-of-custody and submitted to the laboratory along with the samples. The canisters were placed in laboratory-supplied shipping containers, properly labeled, and delivered under standard chain-of-custody protocols to Waypoint Analytical, an accredited laboratory, for analysis of VOCs by EPA Method TO-15. Following collection of the sub-slab vapor samples, the vapor pins were removed, and the boreholes were abandoned and filled with concrete to the floor surface. The sub-slab vapor sample locations were estimated by measuring from known benchmarks within the facility (e.g., doors, windows, exterior walls, etc.) and are shown on Figure 3. 2.2 Quality Assurance/Quality Control Samples For quality assurance/quality control (QA/QC) purposes, one duplicate sub-slab vapor sample (SSV-DUP) was collected from sample SSV-4 using a T-fitting, which allows for the collection of two samples from the same location simultaneously. The duplicate sample was analyzed for VOCs by EPA Method TO-15. Non-dedicated equipment and tools were decontaminated prior to use at each sampling location. Laboratory QA/QC procedures were employed to ensure appropriate sample handling and analysis and to aid in the review and validation of the analytical data. QA/QC procedures were conducted in accordance with the method protocols and include regular equipment maintenance, equipment calibrations, and adherence to specific sample custody and data management procedures. Samples were analyzed in conjunction with appropriate blanks, laboratory duplicates, continuing calibration standards, surrogate standards, and matrix spiking standards in 8 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/mccormack baron salazar (mbs)/mbs-002 cleveland avenue homes/sub-slab vapor assessment/report/sub-slab vapor sampling report - cleveland avenue homes (5-18-23) 2.doc accordance with approved methodologies to monitor both instrument and analyst performance. Laboratory reporting limits for each analyte were at or below appropriate screening criteria, where possible. Additionally, H&H requested that the laboratory include estimated concentrations for compounds that were detected at levels above the laboratory method detection limit but below the laboratory reporting limit (J flags). A copy of the laboratory analytical data report and QA package for each group of samples submitted to and analyzed by Waypoint Analytical are provided in Appendix B. A copy of the completed chain-of-custody record has been appended to the corresponding laboratory analytical report included within Appendix B. 2.3 Sub-Slab Vapor Sampling Results A tabular summary of the sub-slab vapor sample analytical results is provided in Table 2. The laboratory analytical report and chain of custody record are provided in Appendix B. Sub-slab analytical results were compared to the January 2023 DEQ DWM Residential SGSLs. Laboratory analytical results indicate the presence of multiple VOCs, including chlorinated and petroleum-related compounds, in the sub-slab vapor samples. No compounds were detected in the sub-slab vapor samples at concentrations above residential SGSLs. Of note, only trace concentrations of benzene and PCE, two primary compounds of concern at the Site, were detected at four sample locations for benzene and only one location for PCE. TCE was not detected in sub-slab vapor samples at concentrations above the laboratory MDLs. Three compounds, acetone, 1,3-dichlorobenzene, and trichlorofluoromethane, were detected in each of the sub-slab vapor samples but do not have established SGSLs. Additionally, 4-ethyltoluene was detected in SSV-1 and does not have an established SGSL. Risk Calculations The DEQ DWM SGSLs are conservative and based upon a lifetime incremental cancer risk (LICR) of 1.0 x 10-6 for potential carcinogenic effects and a hazard quotient (HQ) of 0.2 for potential non-carcinogenic effects. The DEQ and Environmental Protection Agency (EPA) 9 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/mccormack baron salazar (mbs)/mbs-002 cleveland avenue homes/sub-slab vapor assessment/report/sub-slab vapor sampling report - cleveland avenue homes (5-18-23) 2.doc acceptable risk level for potential carcinogenic risks is a cumulative LICR of 1.0 x 10-4 or less, and the acceptable risk level for non-carcinogenic risks is a cumulative hazard index (HI) of 1.0 or less. The HI is the sum of the HQs for each detected compound. H&H utilized the DEQ risk calculator (January 2023) assuming a residential land use scenario to further evaluate potential cumulative risks for the soil gas to indoor air vapor intrusion pathway for the proposed residential development. H&H calculated the cumulative risks using the highest concentration of each compound detected in the sub-slab vapor samples. The results of risk calculations indicate a cumulative LICR of 3.4 x 10-7 and a cumulative non-carcinogenic HI of 0.031. The calculated risks using combined Site data are below the DEQ acceptable levels of 1.0 x 10-4 for carcinogenic risk and 1.0 for non-carcinogenic risk. The DEQ Risk Calculator input/output forms are included in Appendix C. 10 https://harthick.sharepoint.com/sites/masterfiles-1/shared documents/aaa-master projects/mccormack baron salazar (mbs)/mbs-002 cleveland avenue homes/sub-slab vapor assessment/report/sub-slab vapor sampling report - cleveland avenue homes (5-18-23) 2.doc 3.0 Summary, Conclusions, and Recommendations In April 2023, H&H performed sub-slab vapor assessment activities to further evaluate the potential for vapor intrusion into proposed apartment buildings at the Cleveland Avenue Homes Site in Winston Salem, North Carolina. The assessment activities were conducted in anticipation of the Site’s entry into DEQ Brownfields Program. The assessment activities included collection of four sub-slab vapor samples in two existing buildings with slab-on-grade foundations located on the northwestern portion of the Site. The remaining Site buildings have crawl spaces; therefore, no assessment was performed in those buildings. A brief summary of the sub-slab vapor assessment activities is provided below. • Samples SSV-1 and SSV-2 were collected within the building at 924-926 New Hope Lane, and samples SSV-3 and SSV-4 were collected within the building at 928-932 New Hope Lane. • No compounds were detected in the sub-slab vapor samples at concentrations above Residential SGSLs. TCE was not detected in the sub-slab vapor samples at concentrations above the MDLs. • The results of cumulative risk calculations using sub-slab data indicate that carcinogenic and non-carcinogenic risk levels are below DEQ and EPA acceptable risk levels. As such, vapor intrusion does not appear to be a significant concern at the Site. Nonetheless, as a precautionary measure, the PD has proposed the installation of a passive sub-slab vapor intrusion mitigation system (VIMS) for all proposed Site buildings. The VIMS design will be submitted to and approved by DEQ prior to installation. The VIMS will be installed such that it can be converted to an active system, if warranted, based on the results of future monitoring. Recommendations Based on the results of the additional sub-slab vapor assessment activities, no further assessment is recommended. H&H recommends that a passive sub-slab VIMS be installed in accordance with a DEQ-approved Vapor Intrusion Mitigation Plan (VIMP). Following receipt of a Letter of Eligibility from the Brownfields Program, assignment of a Project Manager, and participation in a kick-off meeting, a VIMP will be drafted and sent to DEQ for review and approval. Table 1Summary of Soil Gas Analytical DataCleveland Avenue HomesWinston-Salem, North CarolinaH&H Job No. MBS-002Evaluation AreaSample IDSG-1 SG-2 SG-2D SG-3 SG-4 SG-5 SG-5D SG-6 SG-7 SG-8 SG-8D SG-9Sample Date10/17/2022 10/17/2022 10/17/2022 10/17/2022 10/17/2022 10/17/2022 10/17/2022 10/18/2022 10/18/2022 10/18/2022 10/18/2022 10/18/2022Sample Depth5.5' 5.5' 10.0' 5.5' 5.5' 5.5' 25.0' 5.5' 5.5' 5.5' 9.0' 5.5'UnitsVOCs (TO-15)Acetone 6.85 B1 39.5 54.0 7.09 B1 17.2 37.3 10.6 7.36 B1 2.67 B1J 7.68 B1 6.94 B1 13.1NEBenzene 1.96 8.7615.00.30 3J 1.17 J 10.8 2.52 0.367 J 0.642 J 0.907 J 2.54<0.073312Bromomethane<0.115 <0.115 <0.115 <0.115 <0.1153.17<0.115 <0.115 <0.115 <0.115 <0.115 <0.115351,3-Butadiene<0.3287.85 63.5<0.328 <0.328 <0.328 <0.328 <0.328 <0.328 <0.32810.7<0.3283.1Carbon Disulfide 67.8 112 267 5.61J 37.0 220 6.93 8.15 21.1 16.8 45.4 0.660 J 4,900Chloroform4.211.53 J 2.67<0.08640.605 J24.81.16 J 0.801 J 0.571 J 0.801 J 1.21 J 1.14 J 4.1Chloromethane<0.0673 <0.06730.752J<0.0673 <0.0673 <0.0673 <0.0673 <0.0673 <0.0673 <0.0673 <0.0673 <0.0673630Cyclohexane 5.86 5.75<0.1614.60 5.93 10.1 10.3<0.1615.82 6.49 6.46 4.94 42,000Dichlorodifluoromethane 3.23 3.03 3.39 3.00<0.1344.91 5.61<0.1343.01 3.05 2.89 3.07 7001,1-Dichloroethane<0.101 <0.101 <0.101 <0.101 <0.101 <0.1013.15<0.101 <0.101 <0.101 <0.101 <0.10158cis-1,2-Dichloroethene<0.0955 <0.0955 <0.0955 <0.09550.420 J<0.0955 <0.0955 <0.0955 <0.0955 <0.0955 <0.0955 <0.0955280Ethylbenzene 4.59 7.83 7.09 0.881 J 2.57 7.56 0.673 J 0.412 J 0.947 J 0.925 J 0.799 J 1.96 J 374-Ethyltoluene 2.51 6.06<0.1280.870 J 1.06 J<0.1280.501 J<0.1280.398 J<0.128 <0.128 <0.128 NE1,1,2-Trichloro-1,2,2-trifluoroethane<0.5610.644 J 1.32 J<0.561 <0.5610.720 J<0.561 <0.561 <0.561 <0.5610.828 J<0.56135,000Heptane 3.14 5.50 39.8<0.1430.721 J 14.1 1.77 J<0.1430.393 J<0.1430.664 J<0.1432,800n-Hexane 2.69 6.94 91.9 0.567 J 2.44 12.8 10.3 1.29 J 1.00 J 0.909 J 13.9<0.04724,9002-Hexanone<0.285 <0.285 <0.285 <0.2850.717J<0.285 <0.2850.418 J<0.285 <0.285 <0.285 <0.285210Isopropyl Alchohol 1.06B1J<0.139 <0.1391.83B1 J 5.98<0.139 <0.1391.37 B1J 0.801 B1J 1.02 B1J 1.01 B1J 1.20 B1J 1,400Methyl Ethyl Ketone (MEK) 0.929 J 4.48 52.2 0.988 J 2.64 4.47 3.80 1.46 J 0.372 J 0.843 J 1.77 2.34 35,000Methyl tert-butyl ether (MTBE)<0.0336 <0.0336 <0.0336 <0.0336 <0.0336 <0.0336 <0.0336 <0.03361.19 J<0.0336 <0.0336 <0.03363604-Methyl-2-Pentanone 0.553J 3.62<0.121 <0.1210.573 J 0.922 J<0.1210.393 J<0.121 <0.1210.729 J<0.12121,000Methylene Chloride 8.43 3.58 11.3 3.43 9.62 16.3 10.1 4.26 3.12 4.32 3.42 2.00 3,400Naphthalene<0.18334.2<0.183 <0.183 <0.1830.425 J<0.1830.608 J<0.183 <0.183 <0.183 <0.1832.8Propene 6.86 44.8 909<0.242 <0.24234.0<0.242 <0.2422.33 3.15 426<0.24221,000Styrene 0.720 J 3.53 2.35<0.124 <0.1242.25<0.124 <0.124 <0.124 <0.124 <0.124 <0.1247,000Tetrachloroethene 13.4 1.30 J 1.43J 2.46 J 2.60 J 6.84 273 26.1 7.81 1.64 J 0.746 J 2.73 J 280Tetrahydrofuran 2.77 13.8 7.14<0.1072.03 3.57 0.725 J<0.1070.395 J 0.820 J 0.773 J 0.257 J 14,000Toluene 30.2 50.7 52.6 2.93 11.0 71.8 8.56 2.70 3.12 8.64 8.35 0.422 J 35,000Trichlorofluoromethane 2.03 J 1.83 J<0.1301.84 J 2.96 5.51 5.73 1.63 J 1.61 J 2.74 J 3.34 1.71 JNE1,2,4-Trimethylbenzene 10.9 50.6 13.6 2.69 6.17 14.5 1.90 J 0.914 J 2.10 J 1.65 J 1.13 J 0.590 J 4201,3,5-Trimethylbenzene 3.43 13.8<0.2360.629 J 1.56 J<0.2361.08 J<0.2360.708 J 0.452 J<0.236 <0.236420Vinyl Acetate<0.224 <0.224 <0.224 <0.224 <0.224 <0.224 <0.224 <0.224 <0.2240.806 J<0.224 <0.2241,400Xylene (Total) 21.4 38.2 30.4 5.15 JB1 12.7 B1 35.8 5.71 JB1 2.86 JB1 5.03 JB1 5.73 JB1 4.39 JB1 1.04 B1J 700pyNotes:1) North Carolina Department of Environmental Quality (DEQ) Division of Waste Management (DWM) Vapor Intrusion Sub-Slab & Exterior Soil Gas Screening Levels (SGSLs) dated January 2023.2) DEQ DWM Cumulative Risk Calculator dated January 2023 and is based on Targer Cancel Risk = 1 x 10-6 and Target Hazard Quotient = 0.2.Concentrations are reported in micrograms per cubic meter (µg/m3).Compound concentrations are reported to the laboratory method detection limits.Laboratory analytical method is shown in parentheses. Only compounds detected in at least one sample are shown in the above table.Bold values indicate an exceedance of DWM Residential SGSL. VOCs = volatile organic compounds; NE = not establishedJ = Estimated concentration that is above the laboratory method detection limit but below the laboratory reporting limit B1 = Compound was detected in the laboratory method blank. Residential SGSLs (1)Near Proposed Apartment Buildings in Southern Portion of Site (Downgradient of Former Dry-Cleaner)µg/m3Near Proposed Apartment Buildings in Western Portion of Site (Downgradient of Current/Former Gas Stations, an Automotive Painting Facility, and Dry Cleaners)https://harthick.sharepoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/McCormack Baron Salazar (MBS)/MBS-002 Cleveland Avenue Homes/Sub-Slab Vapor Assessment/Tables/Prior Soil Gas Data5/9/2023Table 1 (Page 1 of 2)Hart & Hickman, PC Table 1Summary of Soil Gas Analytical DataCleveland Avenue HomesWinston-Salem, North CarolinaH&H Job No. MBS-002Evaluation AreaSample IDSG-10 SG-11 SG-12 SG-13 SG-14 SG-15 SG-16Sample Date10/17/2022 10/17/2022 10/17/2022 10/17/2022 10/18/2022 10/18/2022 10/17/2022Sample Depth4.5' 5.5' 5.5' 5.5' 5.5' 5.5' 5.5'UnitsVOCs (TO-15)Acetone 9.90 9.66 5.18 B1 7.33 B1 14.00 11.0 6.67 B1NEBenzene 0.291 J 0.661 J 0.259 J<0.07330.939 J 1.05 J 3.62 12Bromomethane<0.115 <0.115 <0.115 <0.115 <0.115 <0.115 <0.115351,3-Butadiene<0.328 <0.328 <0.328 <0.328 <0.328 <0.328 <0.3283.1Carbon Disulfide 1.67 J 20.0 3.03 J 2.75 J 13.1 42.7 74.6 4,900Chloroform<0.08640.684 J<0.0864 <0.08641.24 J16.92.56 4.1Chloromethane<0.0673 <0.0673 <0.0673 <0.0673 <0.0673 <0.0673 <0.0673630Cyclohexane 6.52 5.50 4.85 4.72 6.73 5.10 6.72 42,000Dichlorodifluoromethane<0.1343.10 2.69 3.01 3.04 2.96 2.71 7001,1-Dichloroethane<0.101 <0.101 <0.101 <0.101 <0.101 <0.101 <0.10158cis-1,2-Dichloroethene<0.0955 <0.0955 <0.0955 <0.0955 <0.0955 <0.09550.456 J 280Ethylbenzene<0.106 <0.106 <0.1060.621 J 6.30 1.13 J 7.20 374-Ethyltoluene<0.128 <0.128 <0.1281.41 J 0.841 J<0.1282.57NE1,1,2-Trichloro-1,2,2-trifluoroethane<0.5610.674 J<0.561 <0.561 <0.561 <0.561 <0.56135,000Heptane 0.840 J<0.143 <0.1430.496 J 0.496 J 0.611 J 1.15 J 2,800n-Hexane 0.818 J 0.825 J 0.582 J<0.0472 <0.04721.20 J 1.11 J 4,9002-Hexanone 0.733 J 0.664 J 0.537 J<0.285 <0.285 <0.285 <0.285210Isopropyl Alchohol 1.77 B1J 1.94 B1J 2.36 B1J 1.42 B1J 1.13 B1J 1.73 B1J 1.09 B1J 1,400Methyl Ethyl Ketone (MEK) 1.74 1.93 1.29 J 1.34 J 1.49 1.21 J 1.70 35,000Methyl tert-butyl ether (MTBE)<0.0336 <0.0336 <0.0336 <0.0336 <0.0336 <0.033610.1 3604-Methyl-2-Pentanone<0.121 <0.121 <0.121 <0.121 <0.121 <0.1210.598 J 21,000Methylene Chloride 8.44 7.07 4.00 7.19 3.18 6.38 4.33 3,400Naphthalene 1.06 J 0.524 J<0.1833.350.750 J<0.183 <0.1832.8Propene<0.242 <0.242 <0.242 <0.242 <0.2422.07<0.24221,000Styrene<0.124 <0.124 <0.124 <0.124 <0.124 <0.1240.596 J 7,000Tetrachloroethene 2.25 J 3.32 J 2.31 J 6.04<0.1815.61 1.98 J 280Tetrahydrofuran 0.637 J 1.01 J<0.1070.637 J 0.463 J<0.1073.46 14,000Toluene 1.79 J 1.73 J 1.27 J 1.68 J 21.0 7.79 183 35,000Trichlorofluoromethane 1.72 J 1.87 J 1.38 J 1.78 J 1.84 J 1.91 J 1.35 JNE1,2,4-Trimethylbenzene<0.1100.890 J<0.11010.5 4.53 1.39 J 14.0 4201,3,5-Trimethylbenzene<0.236 <0.236 <0.2362.68 0.536 J<0.2363.00 420Vinyl Acetate<0.224 <0.224 <0.224 <0.224 <0.224 <0.224 <0.2241,400Xylene (Total) 1.81 JB1 1.94 JB1 1.26 B1J 4.18 JB1 10.7 B1 5.12 JB1 28.1 700pyNotes:1) North Carolina Department of Environmental Quality (DEQ) Division of Waste Management (DWM) Vapor Intrusion Sub-Slab & Exterior Soil Gas Screening Levels (SGSLs) dated January 2023.2) DEQ DWM Cumulative Risk Calculator dated January 2023 and is based on Targer Cancel Risk = 1 x 10-6 and Target Hazard Quotient = 0.2.Concentrations are reported in micrograms per cubic meter (µg/m3).Compound concentrations are reported to the laboratory method detection limits.Laboratory analytical method is shown in parentheses. Only compounds detected in at least one sample are shown in the above table.Bold values indicate an exceedance of DWM Residential SGSL. VOCs = volatile organic compounds; NE = not establishedJ = Estimated concentration that is above the laboratory method detection limit but below the laboratory reporting limit B1 = Compound was detected in the laboratory method blank. Residential SGSLs (1)Near Proposed Apartment Buildings in Central and Eastern Portions of Siteµg/m3https://harthick.sharepoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/McCormack Baron Salazar (MBS)/MBS-002 Cleveland Avenue Homes/Sub-Slab Vapor Assessment/Tables/Prior Soil Gas Data5/9/2023Table 1 (Page 2 of 2)Hart & Hickman, PC Table 2 Summary of Sub-Slab Vapor Analytical Data Cleveland Avenue Homes Winston-Salem, North Carolina H&H Job No. MBS-002 Evaluation Area Sample ID SSV-1 SSV-2 SSV-3 Sample Date Units VOCs (TO-15) Acetone 39.7 24.3 31.8 9.19 10.8 NE Benzene 0.571 J 0.546 J 0.424 J <0.073 0.357 J 12 Carbon Disulfide 0.470 B J 0.358 J 0.647 J <0.060 0.261 J 4,900 Chloroform <0.086 <0.086 0.512 J <0.086 <0.086 4.1 Chloromethane <0.067 <0.067 0.600 J <0.067 <0.067 630 Cyclohexane <0.161 2.72 J 2.40 J <0.161 <0.161 42,000 1,3-Dichlorobenzene 9.69 J 2.54 J 7.95 J 7.97 J 7.63 J NE Dichlorodifluoromethane 2.31 J 3.17 8.33 3.21 3.13 700 1,4-Dioxane 2.84 1.59 J <0.435 <0.435 <0.435 19 Ethyl Acetate 0.565 J <0.136 <0.136 0.324 J <0.136 490 Ethylbenzene <0.106 <0.106 0.338 J <0.106 <0.106 37 4-Ethyltoluene 3.57 <0.128 <0.128 <0.128 <0.128 NE 1,1,2-Trichloro-1,2,2-trifluoroethane <0.561 0.590 J 0.613 J 0.590 J 0.628 J 35,000 Heptane <0.143 <0.143 0.426 J <0.143 <0.143 2,800 n-Hexane 0.412 J 0.271 J 0.986 J <0.047 <0.047 4,900 2-Hexanone 0.979 J 0.868 J <0.285 <0.285 <0.285 210 Isopropyl Alcohol 115 17.6 B 79.1 13.3 B 12.3 B 1,400 Methyl Ethyl Ketone (MEK)4.82 3.64 2.72 1.10 J 1.07 J 35,000 4-Methyl-2-Pentanone 1.23 J 0.622 J 0.356 J <0.121 <0.121 21,000 Methylene Chloride 15.6 7.36 23.9 6.07 2.65 3,400 Styrene 3.31 0.468 J 0.421 J <0.124 <0.124 7,000 Tetrachloroethene 0.671 J <0.181 <0.181 <0.181 <0.181 280 Tetrahydrofuran 1.24 J 0.778 J 0.710 J 0.418 J 0.404 J 14,000 Toluene 1.07 J 1.12 J 2.10 0.663 J 0.719 J 35,000 Trichlorofluoromethane 1.44 J 2.02 J 14.7 2.02 J 1.98 J NE 1,2,4-Trimethylbenzene 3.48 4.07 4.09 3.88 3.85 420 1,3,5-Trimethylbenzene <0.236 3.29 <0.236 3.25 3.24 420 o-Xylene 0.399 J 0.399 J 0.373 J <0.157 <0.157 700 m,p-Xylene 3.06 J 4.27 J 4.32 J 4.00 J 3.98 J 700 Xylene (Total)3.46 J 4.67 J 4.69 J 4.00 J 3.98 J 700 DEQ Cumulative Risk Calculator(2)Acceptable Risk Levels Residential Lifetime Incremental Cancer Risk (LICR)≤1.0 x 10-4 Residential Hazard Index (HI) ≤1.0 Notes: 1)North Carolina Department of Environmental Quality (DEQ) Division of Waste Management (DWM) Vapor Intrusion Sub-Slab & Exterior Soil Gas Screening Levels (SGSLs) dated January 2023. 2)DEQ DWM Cumulative Risk Calculator dated January 2023 and is based on Target Cancer Risk = 1 x 10-6 and Target Hazard Quotient = 0.2. Concentrations are reported in micrograms per cubic meter (µg/m3). Compound concentrations are reported to the laboratory method detection limits. Laboratory analytical method is shown in parentheses. Only compounds detected in at least one sample are shown in the above table. VOCs = volatile organic compounds; NE = not established J = Estimated concentration that is above the laboratory method detection limit but below the laboratory reporting limit B = Compound was detected in the laboratory method blank. Residential SGSLs (1) Fairview Apartment Buildings in Northwestern Portion of Site µg/m3 Residential Worst-Case 3.4 x 10-7 0.031 SSV-4 / SSV-DUP 4/12/2023 https://harthick.sharepoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/McCormack Baron Salazar (MBS)/MBS-002 Cleveland Avenue Homes/Sub-Slab Vapor Assessment/Tables/2023.05.01 SSV Data Table MBS.002 5/10/2023 Table 2 (Page 1 of 1) Hart & Hickman, PC N. CLEVELAND AVENUEREVISION NO. 0 JOB NO. MBS-002 DATE: 5-4-23 FIGURE NO. 2 CLEVELAND AVENUE HOMES WINSTON-SALEM, NORTH CAROLINA SITE AND SURROUNDING AREA MAP LEGEND SITE PROPERTY BOUNDARY PARCEL LINE NOTES: 1. AERIAL IMAGERY OBTAINED FROM ESRI WORLD IMAGERY, 2023. 2. BASE DATA OBTAINED FROM FORSYTH COUNTY GIS, 2021. 2923 South Tryon Street-Suite 100 Charlotte, North Carolina 28203 704-586-0007(p) 704-586-0373(f) License # C-1269 / #C-245 Geology E. 17 th STREET 14th STREET NEN. LIBERTY STREET E.15th STREET N. CLEVELAND AVENUEE.16th STREET E.15th STREET NEW HOPE LANE S:\AAA-Master Projects\McCormack Baron Salazar (MBS)\MBS-002 Cleveland Avenue Homes\Phase II ESA\Figures\SITE MAP.dwg, FIG 2, 5/4/2023 12:28:10 PM, kmckinneyRESIDENTIAL RESIDENTIAL RESIDENTIAL RESIDENTIAL RESIDENTIAL CHURCH MASONIC LODGE AUTO SERVICE GARAGE VACANT/ FORMER DRYCLEANERS FARMER'S MARKET CHURCH GAS STATION FORMER DRYCLEANER GAS STATION FORMER AUTO PAINTER CUSTOM HAIR SALON/ T-SHIRT STORE FORMER RESIDENTIALVACANT LAND E. 17th STREET N. LIBERTY STREETE. 15th STREET N. CLEVELAND AVENUENEW HOPE LANE N. CLEVELAND AVENUESG-15 SG-14 SG-12 SG-13 SG-6 SG-7 SG-8/8D SG-9 SG-5/5D SG-4 SG-3 SG-10 SG-1 SG-2/2D SG-11 SG-16/16D REVISION NO. 0 JOB NO. MBS-002 DATE: 5-4-23 FIGURE NO. 3 CLEVELAND AVENUE HOMES WINSTON-SALEM, NORTH CAROLINA SUB-SLAB VAPOR SAMPLE LOCATION MAP LEGEND SITE PROPERTY BOUNDARY PARCEL LINE PROPOSED BUILDINGS OCTOBER 2022 SOIL GAS SAMPLE LOCATION APRIL 2023 SUB-SLAB VAPOR SAMPLE LOCATION NOTES: 1.AERIAL IMAGERY OBTAINED FROM ESRI WORLD IMAGERY, 2023. 2.BASE DATA OBTAINED FROM FORSYTH COUNTY GIS, 2021. 2923 South Tryon Street-Suite 100 Charlotte, North Carolina 28203 704-586-0007(p) 704-586-0373(f) License # C-1269 / #C-245 Geology 14th STREET NE E. 16th STREET E. 15th STREET SSV-2 SSV-1 SSV-4/SSV-DUP SSV-3 S:\AAA-Master Projects\McCormack Baron Salazar (MBS)\MBS-002 Cleveland Avenue Homes\Sub-Slab Vapor Assessment\Figures\SITE MAP.dwg, FIG 2, 5/4/2023 1:28:17 PM, kmckinney Appendix A Sub-Slab Vapor Sampling Forms &Žƌŵ^dͲϭ6XPPD&DQLVWHU6KXWLQ7HVW)LHOG)RUP3URMHFW1RBBBBBBBBBBBBBBBBBBB 6DPSOHUBBBBBBBBBBBBBBBBBBBBBB,QLWLDO3UHVVXUH3DVV"!+J7LPH&DQLVWHU3UHVVXUH3DVV"5HJXODWRU=HUR3UHVVXUH7LPH&DQLVWHU3UHVVXUH3DVV"PPGG\\ +J 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for performance of said analysis. 4/26/2023 Hart & Hickman (Charlotte) Bo Cappleman 2923 South Tryon St. Ste 100 Charlotte, NC, 28203 Ref: Analytical Testing Lab Report Number: 23-102-0033 Client Project Description: MBS-002 Dear Bo Cappleman: Waypoint Analytical, LLC (Charlotte) received sample(s) on 4/12/2023 for the analyses presented in the following report. The above referenced project has been analyzed per your instructions. The analyses were performed in accordance with the applicable analytical method. The analytical data has been validated using standard quality control measures performed as required by the analytical method. Quality Assurance, method validations, instrumentation maintenance and calibration for all parameters were performed in accordance with guidelines established by the USEPA (including 40 CFR 136 Method Update Rule May 2021) unless otherwise indicated. Certain parameters (chlorine, pH, dissolved oxygen, sulfite...) are required to be analyzed within 15 minutes of sampling. Usually, but not always, any field parameter analyzed at the laboratory is outside of this holding time. Refer to sample analysis time for confirmation of holding time compliance. The results are shown on the attached Report of Analysis(s). Results for solid matrices are reported on an as-received basis unless otherwise indicated. This report shall not be reproduced except in full and relates only to the samples included in this report. Please do not hesitate to contact me or client services if you have any questions or need additional information. Sincerely, Angela D Overcash Senior Project Manager Page 1 of 34 Certification Summary Laboratory ID: WP CNC: Waypoint Analytical Carolina, Inc. (C), Charlotte, NC State Program Lab ID Expiration Date 07/31/202337735State ProgramNorth Carolina 12/31/2023402State ProgramNorth Carolina 07/31/202399012State ProgramSouth Carolina 12/31/202299012State ProgramSouth Carolina Page 1 of 1 00016/23-102-0033 Page 2 of 34 Report Number: Sample Summary Table Client Project Description: 23-102-0033 MBS-002 Lab No Client Sample ID Matrix Date Collected Date Received 04/12/2023 12:28Air 93550 SSV-4 04/12/2023 16:20 04/12/2023Air 93551 SSV-DUP 04/12/2023 16:20 04/12/2023 11:37Air 93552 SSV-2 04/12/2023 16:20 04/12/2023 12:05Air 93553 SSV-3 04/12/2023 16:20 04/12/2023 11:08Air 93554 SSV-1 04/12/2023 16:20 Page 3 of 34 Summary of Detected Analytes QualifiersAnalyzedUnitsResult Report Number: Client Sample ID Method Parameters Lab Sample ID 23-102-0033 Report Limit Project:MBS-002 V 93550SSV-4 9.19 04/18/2023 18:52TO-15 Acetone µg/m3 0.202 J7.97 04/18/2023 18:52TO-15 1,3-Dichlorobenzene µg/m3 0.174 3.21 04/18/2023 18:52TO-15 Dichlorodifluoromethane µg/m3 0.134 J0.324 04/18/2023 18:52TO-15 Ethyl Acetate µg/m3 0.136 J0.590 04/18/2023 18:52TO-15 1,1,2-Trichloro-1,2,2-trifluoroethane µg/m3 0.561 B13.3 04/18/2023 18:52TO-15 Isopropyl Alcohol µg/m3 0.139 J1.10 04/18/2023 18:52TO-15 Methyl Ethyl Ketone (MEK)µg/m3 0.224 6.07 04/18/2023 18:52TO-15 Methylene Chloride µg/m3 0.488 J0.418 04/18/2023 18:52TO-15 Tetrahydrofuran µg/m3 0.107 J0.663 04/18/2023 18:52TO-15 Toluene µg/m3 0.090 J2.02 04/18/2023 18:52TO-15 Trichlorofluoromethane µg/m3 0.130 3.88 04/18/2023 18:52TO-15 1,2,4-Trimethylbenzene µg/m3 0.110 3.25 04/18/2023 18:52TO-15 1,3,5-Trimethylbenzene µg/m3 0.236 J4.00 04/18/2023 18:52TO-15 m,p-Xylene µg/m3 0.217 J4.00 04/18/2023 18:52TO-15 Xylene (Total)µg/m3 0.157 V 93551SSV-DUP 10.8 04/18/2023 19:44TO-15 Acetone µg/m3 0.202 J0.357 04/18/2023 19:44TO-15 Benzene µg/m3 0.073 J0.261 04/18/2023 19:44TO-15 Carbon Disulfide µg/m3 0.060 J7.63 04/18/2023 19:44TO-15 1,3-Dichlorobenzene µg/m3 0.174 3.13 04/18/2023 19:44TO-15 Dichlorodifluoromethane µg/m3 0.134 J0.628 04/18/2023 19:44TO-15 1,1,2-Trichloro-1,2,2-trifluoroethane µg/m3 0.561 B12.3 04/18/2023 19:44TO-15 Isopropyl Alcohol µg/m3 0.139 J1.07 04/18/2023 19:44TO-15 Methyl Ethyl Ketone (MEK)µg/m3 0.224 2.65 04/18/2023 19:44TO-15 Methylene Chloride µg/m3 0.488 J0.404 04/18/2023 19:44TO-15 Tetrahydrofuran µg/m3 0.107 J0.719 04/18/2023 19:44TO-15 Toluene µg/m3 0.090 J1.98 04/18/2023 19:44TO-15 Trichlorofluoromethane µg/m3 0.130 3.85 04/18/2023 19:44TO-15 1,2,4-Trimethylbenzene µg/m3 0.110 3.24 04/18/2023 19:44TO-15 1,3,5-Trimethylbenzene µg/m3 0.236 J3.98 04/18/2023 19:44TO-15 m,p-Xylene µg/m3 0.217 J3.98 04/18/2023 19:44TO-15 Xylene (Total)µg/m3 0.157 V 93552SSV-2 24.3 04/18/2023 20:40TO-15 Acetone µg/m3 0.202 J0.546 04/18/2023 20:40TO-15 Benzene µg/m3 0.073 J0.358 04/18/2023 20:40TO-15 Carbon Disulfide µg/m3 0.060 Page 4 of 34 Summary of Detected Analytes QualifiersAnalyzedUnitsResult Report Number: Client Sample ID Method Parameters Lab Sample ID 23-102-0033 Report Limit Project:MBS-002 V 93552SSV-2 J2.72 04/18/2023 20:40TO-15 Cyclohexane µg/m3 0.161 J2.54 04/18/2023 20:40TO-15 1,3-Dichlorobenzene µg/m3 0.174 3.17 04/18/2023 20:40TO-15 Dichlorodifluoromethane µg/m3 0.134 J1.59 04/18/2023 20:40TO-15 1,4-Dioxane µg/m3 0.435 J0.590 04/18/2023 20:40TO-15 1,1,2-Trichloro-1,2,2-trifluoroethane µg/m3 0.561 J0.271 04/18/2023 20:40TO-15 n-Hexane µg/m3 0.047 J0.868 04/18/2023 20:40TO-15 2-Hexanone µg/m3 0.285 B17.6 04/18/2023 20:40TO-15 Isopropyl Alcohol µg/m3 0.139 3.64 04/18/2023 20:40TO-15 Methyl Ethyl Ketone (MEK)µg/m3 0.224 J0.622 04/18/2023 20:40TO-15 4-Methyl-2-Pentanone µg/m3 0.121 7.36 04/18/2023 20:40TO-15 Methylene Chloride µg/m3 0.488 J0.468 04/18/2023 20:40TO-15 Styrene µg/m3 0.124 J0.778 04/18/2023 20:40TO-15 Tetrahydrofuran µg/m3 0.107 J1.12 04/18/2023 20:40TO-15 Toluene µg/m3 0.090 J2.02 04/18/2023 20:40TO-15 Trichlorofluoromethane µg/m3 0.130 4.07 04/18/2023 20:40TO-15 1,2,4-Trimethylbenzene µg/m3 0.110 3.29 04/18/2023 20:40TO-15 1,3,5-Trimethylbenzene µg/m3 0.236 J0.399 04/18/2023 20:40TO-15 o-Xylene µg/m3 0.157 J4.27 04/18/2023 20:40TO-15 m,p-Xylene µg/m3 0.217 J4.67 04/18/2023 20:40TO-15 Xylene (Total)µg/m3 0.157 V 93553SSV-3 31.8 04/18/2023 21:29TO-15 Acetone µg/m3 0.202 J0.424 04/18/2023 21:29TO-15 Benzene µg/m3 0.073 J0.647 04/18/2023 21:29TO-15 Carbon Disulfide µg/m3 0.060 J0.512 04/18/2023 21:29TO-15 Chloroform µg/m3 0.086 J0.600 04/18/2023 21:29TO-15 Chloromethane µg/m3 0.067 J2.40 04/18/2023 21:29TO-15 Cyclohexane µg/m3 0.161 J7.95 04/18/2023 21:29TO-15 1,3-Dichlorobenzene µg/m3 0.174 8.33 04/18/2023 21:29TO-15 Dichlorodifluoromethane µg/m3 0.134 J0.338 04/18/2023 21:29TO-15 Ethylbenzene µg/m3 0.106 J0.613 04/18/2023 21:29TO-15 1,1,2-Trichloro-1,2,2-trifluoroethane µg/m3 0.561 J0.426 04/18/2023 21:29TO-15 Heptane µg/m3 0.143 J0.986 04/18/2023 21:29TO-15 n-Hexane µg/m3 0.047 79.1 04/18/2023 21:29TO-15 Isopropyl Alcohol µg/m3 0.139 2.72 04/18/2023 21:29TO-15 Methyl Ethyl Ketone (MEK)µg/m3 0.224 J0.356 04/18/2023 21:29TO-15 4-Methyl-2-Pentanone µg/m3 0.121 Page 5 of 34 Summary of Detected Analytes QualifiersAnalyzedUnitsResult Report Number: Client Sample ID Method Parameters Lab Sample ID 23-102-0033 Report Limit Project:MBS-002 V 93553SSV-3 23.9 04/18/2023 21:29TO-15 Methylene Chloride µg/m3 0.488 J0.421 04/18/2023 21:29TO-15 Styrene µg/m3 0.124 J0.710 04/18/2023 21:29TO-15 Tetrahydrofuran µg/m3 0.107 2.10 04/18/2023 21:29TO-15 Toluene µg/m3 0.090 14.7 04/18/2023 21:29TO-15 Trichlorofluoromethane µg/m3 0.130 4.09 04/18/2023 21:29TO-15 1,2,4-Trimethylbenzene µg/m3 0.110 J0.373 04/18/2023 21:29TO-15 o-Xylene µg/m3 0.157 J4.32 04/18/2023 21:29TO-15 m,p-Xylene µg/m3 0.217 J4.69 04/18/2023 21:29TO-15 Xylene (Total)µg/m3 0.157 V 93554SSV-1 39.7 04/26/2023 03:15TO-15 Acetone µg/m3 0.202 J0.571 04/26/2023 03:15TO-15 Benzene µg/m3 0.073 JB0.470 04/26/2023 03:15TO-15 Carbon Disulfide µg/m3 0.060 J9.69 04/26/2023 03:15TO-15 1,3-Dichlorobenzene µg/m3 0.174 J2.31 04/26/2023 03:15TO-15 Dichlorodifluoromethane µg/m3 0.134 2.84 04/26/2023 03:15TO-15 1,4-Dioxane µg/m3 0.435 J0.565 04/26/2023 03:15TO-15 Ethyl Acetate µg/m3 0.136 3.57 04/26/2023 03:15TO-15 4-Ethyltoluene µg/m3 0.128 J0.412 04/26/2023 03:15TO-15 n-Hexane µg/m3 0.047 J0.979 04/26/2023 03:15TO-15 2-Hexanone µg/m3 0.285 115 04/26/2023 03:15TO-15 Isopropyl Alcohol µg/m3 0.139 4.82 04/26/2023 03:15TO-15 Methyl Ethyl Ketone (MEK)µg/m3 0.224 J1.23 04/26/2023 03:15TO-15 4-Methyl-2-Pentanone µg/m3 0.121 15.6 04/26/2023 03:15TO-15 Methylene Chloride µg/m3 0.488 3.31 04/26/2023 03:15TO-15 Styrene µg/m3 0.124 J0.671 04/26/2023 03:15TO-15 Tetrachloroethene µg/m3 0.181 J1.24 04/26/2023 03:15TO-15 Tetrahydrofuran µg/m3 0.107 J1.07 04/26/2023 03:15TO-15 Toluene µg/m3 0.090 J1.44 04/26/2023 03:15TO-15 Trichlorofluoromethane µg/m3 0.130 3.48 04/26/2023 03:15TO-15 1,2,4-Trimethylbenzene µg/m3 0.110 J0.399 04/26/2023 03:15TO-15 o-Xylene µg/m3 0.157 J3.06 04/26/2023 03:15TO-15 m,p-Xylene µg/m3 0.217 J3.46 04/26/2023 03:15TO-15 Xylene (Total)µg/m3 0.157 Page 6 of 34 , REPORT OF ANALYSISReport Number : Project Information : NC 28203 23-102-0033 01102 Hart & Hickman (Charlotte) 2923 South Tryon St. Ste 100 Bo Cappleman Charlotte Received : 04/12/2023 MBS-002 Report Date : 04/26/2023 Sample ID : Lab No : Sampled:SSV-4 93550 Matrix: 4/12/2023 12:28 Air Analytical Method: Prep Method: Test Results Units MDL MQL By Analytical Batch Date / Time Analyzed DF TO-15 Prep TO-15 Prep Batch(es):V32132 04/18/23 09:00 9.19 µg/m3 0.202 4.75Acetone 1 04/18/23 18:52 V32152ENM <0.073 µg/m3 0.073 1.60Benzene 1 04/18/23 18:52 V32152ENM <0.147 µg/m3 0.147 10.4Benzyl Chloride 1 04/18/23 18:52 V32152ENM <0.150 µg/m3 0.150 3.35Bromodichloromethane 1 04/18/23 18:52 V32152ENM <0.153 µg/m3 0.153 5.17Bromoform 1 04/18/23 18:52 V32152ENM <0.115 µg/m3 0.115 1.94Bromomethane 1 04/18/23 18:52 V32152ENM <0.328 µg/m3 0.328 1.111,3-Butadiene 1 04/18/23 18:52 V32152ENM <0.060 µg/m3 0.060 6.23Carbon Disulfide 1 04/18/23 18:52 V32152ENM <0.155 µg/m3 0.155 3.15 Carbon Tetrachloride 1 04/18/23 18:52 V32152ENM <0.107 µg/m3 0.107 2.30Chlorobenzene 1 04/18/23 18:52 V32152ENM <0.208 µg/m3 0.208 4.26Chlorodibromomethane 1 04/18/23 18:52 V32152ENM <0.164 µg/m3 0.164 1.32Chloroethane 1 04/18/23 18:52 V32152ENM <0.086 µg/m3 0.086 2.44Chloroform 1 04/18/23 18:52 V32152ENM <0.067 µg/m3 0.067 1.03Chloromethane 1 04/18/23 18:52 V32152ENM <0.161 µg/m3 0.161 3.44Cyclohexane 1 04/18/23 18:52 V32152ENM <0.151 µg/m3 0.151 3.84 1,2-Dibromoethane 1 04/18/23 18:52 V32152ENM <0.096 µg/m3 0.096 3.011,2-Dichlorobenzene 1 04/18/23 18:52 V32152ENM 7.97 J µg/m3 0.174 12.01,3-Dichlorobenzene 1 04/18/23 18:52 V32152ENM <0.186 µg/m3 0.186 3.011,4-Dichlorobenzene 1 04/18/23 18:52 V32152ENM 3.21 µg/m3 0.134 2.47Dichlorodifluoromethane 1 04/18/23 18:52 V32152ENM <0.101 µg/m3 0.101 2.021,1-Dichloroethane 1 04/18/23 18:52 V32152ENM <0.129 µg/m3 0.129 2.021,2-Dichloroethane 1 04/18/23 18:52 V32152ENM Qualifiers/ Definitions Dilution FactorDFAnalyte detected in blankB Method Quantitation LimitMQLEstimated valueJ Page 7 of 34 , REPORT OF ANALYSISReport Number : Project Information : NC 28203 23-102-0033 01102 Hart & Hickman (Charlotte) 2923 South Tryon St. Ste 100 Bo Cappleman Charlotte Received : 04/12/2023 MBS-002 Report Date : 04/26/2023 Sample ID : Lab No : Sampled:SSV-4 93550 Matrix: 4/12/2023 12:28 Air Analytical Method: Prep Method: Test Results Units MDL MQL By Analytical Batch Date / Time Analyzed DF TO-15 Prep TO-15 Prep Batch(es):V32132 04/18/23 09:00 <0.107 µg/m3 0.107 1.981,1-Dichloroethene 1 04/18/23 18:52 V32152ENM <0.095 µg/m3 0.095 1.98cis-1,2-Dichloroethene 1 04/18/23 18:52 V32152ENM <0.108 µg/m3 0.108 1.98trans-1,2-Dichloroethene 1 04/18/23 18:52 V32152ENM <0.205 µg/m3 0.205 2.311,2-Dichloropropane 1 04/18/23 18:52 V32152ENM <0.622 µg/m3 0.622 3.501,2-Dichlorotetrafluoroethane 1 04/18/23 18:52 V32152ENM <0.178 µg/m3 0.178 2.27cis-1,3-Dichloropropene 1 04/18/23 18:52 V32152ENM <0.178 µg/m3 0.178 2.27trans-1,3-Dichloropropene 1 04/18/23 18:52 V32152ENM <0.435 µg/m3 0.435 1.801,4-Dioxane 1 04/18/23 18:52 V32152ENM 0.324 J µg/m3 0.136 1.80 Ethyl Acetate 1 04/18/23 18:52 V32152ENM <0.106 µg/m3 0.106 2.17Ethylbenzene 1 04/18/23 18:52 V32152ENM <0.128 µg/m3 0.128 2.464-Ethyltoluene 1 04/18/23 18:52 V32152ENM 0.590 J µg/m3 0.561 3.831,1,2-Trichloro-1,2,2-trifluoroethane 1 04/18/23 18:52 V32152ENM <0.143 µg/m3 0.143 2.05Heptane 1 04/18/23 18:52 V32152ENM <0.330 µg/m3 0.330 5.33Hexachlorobutadiene 1 04/18/23 18:52 V32152ENM <0.047 µg/m3 0.047 1.76n-Hexane 1 04/18/23 18:52 V32152ENM <0.285 µg/m3 0.285 2.05 2-Hexanone 1 04/18/23 18:52 V32152ENM 13.3 B µg/m3 0.139 4.92Isopropyl Alcohol 1 04/18/23 18:52 V32152ENM 1.10 J µg/m3 0.224 1.47Methyl Ethyl Ketone (MEK)1 04/18/23 18:52 V32152ENM <0.033 µg/m3 0.033 1.80Methyl tert-butyl ether (MTBE)1 04/18/23 18:52 V32152ENM <0.121 µg/m3 0.121 2.054-Methyl-2-Pentanone 1 04/18/23 18:52 V32152ENM 6.07 µg/m3 0.488 1.74Methylene Chloride 1 04/18/23 18:52 V32152ENM <0.183 µg/m3 0.183 2.62Naphthalene 1 04/18/23 18:52 V32152ENM Qualifiers/ Definitions Dilution FactorDFAnalyte detected in blankB Method Quantitation LimitMQLEstimated valueJ Page 8 of 34 , REPORT OF ANALYSISReport Number : Project Information : NC 28203 23-102-0033 01102 Hart & Hickman (Charlotte) 2923 South Tryon St. Ste 100 Bo Cappleman Charlotte Received : 04/12/2023 MBS-002 Report Date : 04/26/2023 Sample ID : Lab No : Sampled:SSV-4 93550 Matrix: 4/12/2023 12:28 Air Analytical Method: Prep Method: Test Results Units MDL MQL By Analytical Batch Date / Time Analyzed DF TO-15 Prep TO-15 Prep Batch(es):V32132 04/18/23 09:00 <0.242 µg/m3 0.242 0.860Propene 1 04/18/23 18:52 V32152ENM <0.124 µg/m3 0.124 2.13Styrene 1 04/18/23 18:52 V32152ENM <0.104 µg/m3 0.104 3.431,1,2,2-Tetrachloroethane 1 04/18/23 18:52 V32152ENM <0.181 µg/m3 0.181 3.39Tetrachloroethene 1 04/18/23 18:52 V32152ENM 0.418 J µg/m3 0.107 1.47Tetrahydrofuran 1 04/18/23 18:52 V32152ENM 0.663 J µg/m3 0.090 1.88Toluene 1 04/18/23 18:52 V32152ENM <0.209 µg/m3 0.209 3.711,2,4-Trichlorobenzene 1 04/18/23 18:52 V32152ENM <0.144 µg/m3 0.144 2.731,1,1-Trichloroethane 1 04/18/23 18:52 V32152ENM <0.087 µg/m3 0.087 2.73 1,1,2-Trichloroethane 1 04/18/23 18:52 V32152ENM <0.199 µg/m3 0.199 2.15Trichloroethene 1 04/18/23 18:52 V32152ENM 2.02 J µg/m3 0.130 2.81Trichlorofluoromethane 1 04/18/23 18:52 V32152ENM 3.88 µg/m3 0.110 2.461,2,4-Trimethylbenzene 1 04/18/23 18:52 V32152ENM 3.25 µg/m3 0.236 2.461,3,5-Trimethylbenzene 1 04/18/23 18:52 V32152ENM <0.224 µg/m3 0.224 1.76Vinyl Acetate 1 04/18/23 18:52 V32152ENM <0.127 µg/m3 0.127 1.28Vinyl Chloride 1 04/18/23 18:52 V32152ENM <0.157 µg/m3 0.157 2.17 o-Xylene 1 04/18/23 18:52 V32152ENM 4.00 J µg/m3 0.217 5.65m,p-Xylene 1 04/18/23 18:52 V32152ENM 4.00 J µg/m3 0.157 2.17Xylene (Total)1 04/18/23 18:52 V32152 Surrogate: 4-Bromofluorobenzene 97.8 Limits: 70-130%04/18/23 18:521 ENM V32152 Qualifiers/ Definitions Dilution FactorDFAnalyte detected in blankB Method Quantitation LimitMQLEstimated valueJ Page 9 of 34 , REPORT OF ANALYSISReport Number : Project Information : NC 28203 23-102-0033 01102 Hart & Hickman (Charlotte) 2923 South Tryon St. Ste 100 Bo Cappleman Charlotte Received : 04/12/2023 MBS-002 Report Date : 04/26/2023 Sample ID : Lab No : Sampled:SSV-DUP 93551 Matrix: 4/12/2023 0:00 Air Analytical Method: Prep Method: Test Results Units MDL MQL By Analytical Batch Date / Time Analyzed DF TO-15 Prep TO-15 Prep Batch(es):V32132 04/18/23 09:00 10.8 µg/m3 0.202 4.75Acetone 1 04/18/23 19:44 V32152ENM 0.357 J µg/m3 0.073 1.60Benzene 1 04/18/23 19:44 V32152ENM <0.147 µg/m3 0.147 10.4Benzyl Chloride 1 04/18/23 19:44 V32152ENM <0.150 µg/m3 0.150 3.35Bromodichloromethane 1 04/18/23 19:44 V32152ENM <0.153 µg/m3 0.153 5.17Bromoform 1 04/18/23 19:44 V32152ENM <0.115 µg/m3 0.115 1.94Bromomethane 1 04/18/23 19:44 V32152ENM <0.328 µg/m3 0.328 1.111,3-Butadiene 1 04/18/23 19:44 V32152ENM 0.261 J µg/m3 0.060 6.23Carbon Disulfide 1 04/18/23 19:44 V32152ENM <0.155 µg/m3 0.155 3.15 Carbon Tetrachloride 1 04/18/23 19:44 V32152ENM <0.107 µg/m3 0.107 2.30Chlorobenzene 1 04/18/23 19:44 V32152ENM <0.208 µg/m3 0.208 4.26Chlorodibromomethane 1 04/18/23 19:44 V32152ENM <0.164 µg/m3 0.164 1.32Chloroethane 1 04/18/23 19:44 V32152ENM <0.086 µg/m3 0.086 2.44Chloroform 1 04/18/23 19:44 V32152ENM <0.067 µg/m3 0.067 1.03Chloromethane 1 04/18/23 19:44 V32152ENM <0.161 µg/m3 0.161 3.44Cyclohexane 1 04/18/23 19:44 V32152ENM <0.151 µg/m3 0.151 3.84 1,2-Dibromoethane 1 04/18/23 19:44 V32152ENM <0.096 µg/m3 0.096 3.011,2-Dichlorobenzene 1 04/18/23 19:44 V32152ENM 7.63 J µg/m3 0.174 12.01,3-Dichlorobenzene 1 04/18/23 19:44 V32152ENM <0.186 µg/m3 0.186 3.011,4-Dichlorobenzene 1 04/18/23 19:44 V32152ENM 3.13 µg/m3 0.134 2.47Dichlorodifluoromethane 1 04/18/23 19:44 V32152ENM <0.101 µg/m3 0.101 2.021,1-Dichloroethane 1 04/18/23 19:44 V32152ENM <0.129 µg/m3 0.129 2.021,2-Dichloroethane 1 04/18/23 19:44 V32152ENM Qualifiers/ Definitions Dilution FactorDFAnalyte detected in blankB Method Quantitation LimitMQLEstimated valueJ Page 10 of 34 , REPORT OF ANALYSISReport Number : Project Information : NC 28203 23-102-0033 01102 Hart & Hickman (Charlotte) 2923 South Tryon St. Ste 100 Bo Cappleman Charlotte Received : 04/12/2023 MBS-002 Report Date : 04/26/2023 Sample ID : Lab No : Sampled:SSV-DUP 93551 Matrix: 4/12/2023 0:00 Air Analytical Method: Prep Method: Test Results Units MDL MQL By Analytical Batch Date / Time Analyzed DF TO-15 Prep TO-15 Prep Batch(es):V32132 04/18/23 09:00 <0.107 µg/m3 0.107 1.981,1-Dichloroethene 1 04/18/23 19:44 V32152ENM <0.095 µg/m3 0.095 1.98cis-1,2-Dichloroethene 1 04/18/23 19:44 V32152ENM <0.108 µg/m3 0.108 1.98trans-1,2-Dichloroethene 1 04/18/23 19:44 V32152ENM <0.205 µg/m3 0.205 2.311,2-Dichloropropane 1 04/18/23 19:44 V32152ENM <0.622 µg/m3 0.622 3.501,2-Dichlorotetrafluoroethane 1 04/18/23 19:44 V32152ENM <0.178 µg/m3 0.178 2.27cis-1,3-Dichloropropene 1 04/18/23 19:44 V32152ENM <0.178 µg/m3 0.178 2.27trans-1,3-Dichloropropene 1 04/18/23 19:44 V32152ENM <0.435 µg/m3 0.435 1.801,4-Dioxane 1 04/18/23 19:44 V32152ENM <0.136 µg/m3 0.136 1.80 Ethyl Acetate 1 04/18/23 19:44 V32152ENM <0.106 µg/m3 0.106 2.17Ethylbenzene 1 04/18/23 19:44 V32152ENM <0.128 µg/m3 0.128 2.464-Ethyltoluene 1 04/18/23 19:44 V32152ENM 0.628 J µg/m3 0.561 3.831,1,2-Trichloro-1,2,2-trifluoroethane 1 04/18/23 19:44 V32152ENM <0.143 µg/m3 0.143 2.05Heptane 1 04/18/23 19:44 V32152ENM <0.330 µg/m3 0.330 5.33Hexachlorobutadiene 1 04/18/23 19:44 V32152ENM <0.047 µg/m3 0.047 1.76n-Hexane 1 04/18/23 19:44 V32152ENM <0.285 µg/m3 0.285 2.05 2-Hexanone 1 04/18/23 19:44 V32152ENM 12.3 B µg/m3 0.139 4.92Isopropyl Alcohol 1 04/18/23 19:44 V32152ENM 1.07 J µg/m3 0.224 1.47Methyl Ethyl Ketone (MEK)1 04/18/23 19:44 V32152ENM <0.033 µg/m3 0.033 1.80Methyl tert-butyl ether (MTBE)1 04/18/23 19:44 V32152ENM <0.121 µg/m3 0.121 2.054-Methyl-2-Pentanone 1 04/18/23 19:44 V32152ENM 2.65 µg/m3 0.488 1.74Methylene Chloride 1 04/18/23 19:44 V32152ENM <0.183 µg/m3 0.183 2.62Naphthalene 1 04/18/23 19:44 V32152ENM Qualifiers/ Definitions Dilution FactorDFAnalyte detected in blankB Method Quantitation LimitMQLEstimated valueJ Page 11 of 34 , REPORT OF ANALYSISReport Number : Project Information : NC 28203 23-102-0033 01102 Hart & Hickman (Charlotte) 2923 South Tryon St. Ste 100 Bo Cappleman Charlotte Received : 04/12/2023 MBS-002 Report Date : 04/26/2023 Sample ID : Lab No : Sampled:SSV-DUP 93551 Matrix: 4/12/2023 0:00 Air Analytical Method: Prep Method: Test Results Units MDL MQL By Analytical Batch Date / Time Analyzed DF TO-15 Prep TO-15 Prep Batch(es):V32132 04/18/23 09:00 <0.242 µg/m3 0.242 0.860Propene 1 04/18/23 19:44 V32152ENM <0.124 µg/m3 0.124 2.13Styrene 1 04/18/23 19:44 V32152ENM <0.104 µg/m3 0.104 3.431,1,2,2-Tetrachloroethane 1 04/18/23 19:44 V32152ENM <0.181 µg/m3 0.181 3.39Tetrachloroethene 1 04/18/23 19:44 V32152ENM 0.404 J µg/m3 0.107 1.47Tetrahydrofuran 1 04/18/23 19:44 V32152ENM 0.719 J µg/m3 0.090 1.88Toluene 1 04/18/23 19:44 V32152ENM <0.209 µg/m3 0.209 3.711,2,4-Trichlorobenzene 1 04/18/23 19:44 V32152ENM <0.144 µg/m3 0.144 2.731,1,1-Trichloroethane 1 04/18/23 19:44 V32152ENM <0.087 µg/m3 0.087 2.73 1,1,2-Trichloroethane 1 04/18/23 19:44 V32152ENM <0.199 µg/m3 0.199 2.15Trichloroethene 1 04/18/23 19:44 V32152ENM 1.98 J µg/m3 0.130 2.81Trichlorofluoromethane 1 04/18/23 19:44 V32152ENM 3.85 µg/m3 0.110 2.461,2,4-Trimethylbenzene 1 04/18/23 19:44 V32152ENM 3.24 µg/m3 0.236 2.461,3,5-Trimethylbenzene 1 04/18/23 19:44 V32152ENM <0.224 µg/m3 0.224 1.76Vinyl Acetate 1 04/18/23 19:44 V32152ENM <0.127 µg/m3 0.127 1.28Vinyl Chloride 1 04/18/23 19:44 V32152ENM <0.157 µg/m3 0.157 2.17 o-Xylene 1 04/18/23 19:44 V32152ENM 3.98 J µg/m3 0.217 5.65m,p-Xylene 1 04/18/23 19:44 V32152ENM 3.98 J µg/m3 0.157 2.17Xylene (Total)1 04/18/23 19:44 V32152 Surrogate: 4-Bromofluorobenzene 96.4 Limits: 70-130%04/18/23 19:441 ENM V32152 Qualifiers/ Definitions Dilution FactorDFAnalyte detected in blankB Method Quantitation LimitMQLEstimated valueJ Page 12 of 34 , REPORT OF ANALYSISReport Number : Project Information : NC 28203 23-102-0033 01102 Hart & Hickman (Charlotte) 2923 South Tryon St. Ste 100 Bo Cappleman Charlotte Received : 04/12/2023 MBS-002 Report Date : 04/26/2023 Sample ID : Lab No : Sampled:SSV-2 93552 Matrix: 4/12/2023 11:37 Air Analytical Method: Prep Method: Test Results Units MDL MQL By Analytical Batch Date / Time Analyzed DF TO-15 Prep TO-15 Prep Batch(es):V32132 04/18/23 09:00 24.3 µg/m3 0.202 4.75Acetone 1 04/18/23 20:40 V32152ENM 0.546 J µg/m3 0.073 1.60Benzene 1 04/18/23 20:40 V32152ENM <0.147 µg/m3 0.147 10.4Benzyl Chloride 1 04/18/23 20:40 V32152ENM <0.150 µg/m3 0.150 3.35Bromodichloromethane 1 04/18/23 20:40 V32152ENM <0.153 µg/m3 0.153 5.17Bromoform 1 04/18/23 20:40 V32152ENM <0.115 µg/m3 0.115 1.94Bromomethane 1 04/18/23 20:40 V32152ENM <0.328 µg/m3 0.328 1.111,3-Butadiene 1 04/18/23 20:40 V32152ENM 0.358 J µg/m3 0.060 6.23Carbon Disulfide 1 04/18/23 20:40 V32152ENM <0.155 µg/m3 0.155 3.15 Carbon Tetrachloride 1 04/18/23 20:40 V32152ENM <0.107 µg/m3 0.107 2.30Chlorobenzene 1 04/18/23 20:40 V32152ENM <0.208 µg/m3 0.208 4.26Chlorodibromomethane 1 04/18/23 20:40 V32152ENM <0.164 µg/m3 0.164 1.32Chloroethane 1 04/18/23 20:40 V32152ENM <0.086 µg/m3 0.086 2.44Chloroform 1 04/18/23 20:40 V32152ENM <0.067 µg/m3 0.067 1.03Chloromethane 1 04/18/23 20:40 V32152ENM 2.72 J µg/m3 0.161 3.44Cyclohexane 1 04/18/23 20:40 V32152ENM <0.151 µg/m3 0.151 3.84 1,2-Dibromoethane 1 04/18/23 20:40 V32152ENM <0.096 µg/m3 0.096 3.011,2-Dichlorobenzene 1 04/18/23 20:40 V32152ENM 2.54 J µg/m3 0.174 12.01,3-Dichlorobenzene 1 04/18/23 20:40 V32152ENM <0.186 µg/m3 0.186 3.011,4-Dichlorobenzene 1 04/18/23 20:40 V32152ENM 3.17 µg/m3 0.134 2.47Dichlorodifluoromethane 1 04/18/23 20:40 V32152ENM <0.101 µg/m3 0.101 2.021,1-Dichloroethane 1 04/18/23 20:40 V32152ENM <0.129 µg/m3 0.129 2.021,2-Dichloroethane 1 04/18/23 20:40 V32152ENM Qualifiers/ Definitions Dilution FactorDFAnalyte detected in blankB Method Quantitation LimitMQLEstimated valueJ Page 13 of 34 , REPORT OF ANALYSISReport Number : Project Information : NC 28203 23-102-0033 01102 Hart & Hickman (Charlotte) 2923 South Tryon St. Ste 100 Bo Cappleman Charlotte Received : 04/12/2023 MBS-002 Report Date : 04/26/2023 Sample ID : Lab No : Sampled:SSV-2 93552 Matrix: 4/12/2023 11:37 Air Analytical Method: Prep Method: Test Results Units MDL MQL By Analytical Batch Date / Time Analyzed DF TO-15 Prep TO-15 Prep Batch(es):V32132 04/18/23 09:00 <0.107 µg/m3 0.107 1.981,1-Dichloroethene 1 04/18/23 20:40 V32152ENM <0.095 µg/m3 0.095 1.98cis-1,2-Dichloroethene 1 04/18/23 20:40 V32152ENM <0.108 µg/m3 0.108 1.98trans-1,2-Dichloroethene 1 04/18/23 20:40 V32152ENM <0.205 µg/m3 0.205 2.311,2-Dichloropropane 1 04/18/23 20:40 V32152ENM <0.622 µg/m3 0.622 3.501,2-Dichlorotetrafluoroethane 1 04/18/23 20:40 V32152ENM <0.178 µg/m3 0.178 2.27cis-1,3-Dichloropropene 1 04/18/23 20:40 V32152ENM <0.178 µg/m3 0.178 2.27trans-1,3-Dichloropropene 1 04/18/23 20:40 V32152ENM 1.59 J µg/m3 0.435 1.801,4-Dioxane 1 04/18/23 20:40 V32152ENM <0.136 µg/m3 0.136 1.80 Ethyl Acetate 1 04/18/23 20:40 V32152ENM <0.106 µg/m3 0.106 2.17Ethylbenzene 1 04/18/23 20:40 V32152ENM <0.128 µg/m3 0.128 2.464-Ethyltoluene 1 04/18/23 20:40 V32152ENM 0.590 J µg/m3 0.561 3.831,1,2-Trichloro-1,2,2-trifluoroethane 1 04/18/23 20:40 V32152ENM <0.143 µg/m3 0.143 2.05Heptane 1 04/18/23 20:40 V32152ENM <0.330 µg/m3 0.330 5.33Hexachlorobutadiene 1 04/18/23 20:40 V32152ENM 0.271 J µg/m3 0.047 1.76n-Hexane 1 04/18/23 20:40 V32152ENM 0.868 J µg/m3 0.285 2.05 2-Hexanone 1 04/18/23 20:40 V32152ENM 17.6 B µg/m3 0.139 4.92Isopropyl Alcohol 1 04/18/23 20:40 V32152ENM 3.64 µg/m3 0.224 1.47Methyl Ethyl Ketone (MEK)1 04/18/23 20:40 V32152ENM <0.033 µg/m3 0.033 1.80Methyl tert-butyl ether (MTBE)1 04/18/23 20:40 V32152ENM 0.622 J µg/m3 0.121 2.054-Methyl-2-Pentanone 1 04/18/23 20:40 V32152ENM 7.36 µg/m3 0.488 1.74Methylene Chloride 1 04/18/23 20:40 V32152ENM <0.183 µg/m3 0.183 2.62Naphthalene 1 04/18/23 20:40 V32152ENM Qualifiers/ Definitions Dilution FactorDFAnalyte detected in blankB Method Quantitation LimitMQLEstimated valueJ Page 14 of 34 , REPORT OF ANALYSISReport Number : Project Information : NC 28203 23-102-0033 01102 Hart & Hickman (Charlotte) 2923 South Tryon St. Ste 100 Bo Cappleman Charlotte Received : 04/12/2023 MBS-002 Report Date : 04/26/2023 Sample ID : Lab No : Sampled:SSV-2 93552 Matrix: 4/12/2023 11:37 Air Analytical Method: Prep Method: Test Results Units MDL MQL By Analytical Batch Date / Time Analyzed DF TO-15 Prep TO-15 Prep Batch(es):V32132 04/18/23 09:00 <0.242 µg/m3 0.242 0.860Propene 1 04/18/23 20:40 V32152ENM 0.468 J µg/m3 0.124 2.13Styrene 1 04/18/23 20:40 V32152ENM <0.104 µg/m3 0.104 3.431,1,2,2-Tetrachloroethane 1 04/18/23 20:40 V32152ENM <0.181 µg/m3 0.181 3.39Tetrachloroethene 1 04/18/23 20:40 V32152ENM 0.778 J µg/m3 0.107 1.47Tetrahydrofuran 1 04/18/23 20:40 V32152ENM 1.12 J µg/m3 0.090 1.88Toluene 1 04/18/23 20:40 V32152ENM <0.209 µg/m3 0.209 3.711,2,4-Trichlorobenzene 1 04/18/23 20:40 V32152ENM <0.144 µg/m3 0.144 2.731,1,1-Trichloroethane 1 04/18/23 20:40 V32152ENM <0.087 µg/m3 0.087 2.73 1,1,2-Trichloroethane 1 04/18/23 20:40 V32152ENM <0.199 µg/m3 0.199 2.15Trichloroethene 1 04/18/23 20:40 V32152ENM 2.02 J µg/m3 0.130 2.81Trichlorofluoromethane 1 04/18/23 20:40 V32152ENM 4.07 µg/m3 0.110 2.461,2,4-Trimethylbenzene 1 04/18/23 20:40 V32152ENM 3.29 µg/m3 0.236 2.461,3,5-Trimethylbenzene 1 04/18/23 20:40 V32152ENM <0.224 µg/m3 0.224 1.76Vinyl Acetate 1 04/18/23 20:40 V32152ENM <0.127 µg/m3 0.127 1.28Vinyl Chloride 1 04/18/23 20:40 V32152ENM 0.399 J µg/m3 0.157 2.17 o-Xylene 1 04/18/23 20:40 V32152ENM 4.27 J µg/m3 0.217 5.65m,p-Xylene 1 04/18/23 20:40 V32152ENM 4.67 J µg/m3 0.157 2.17Xylene (Total)1 04/18/23 20:40 V32152 Surrogate: 4-Bromofluorobenzene 102 Limits: 70-130%04/18/23 20:401 ENM V32152 Qualifiers/ Definitions Dilution FactorDFAnalyte detected in blankB Method Quantitation LimitMQLEstimated valueJ Page 15 of 34 , REPORT OF ANALYSISReport Number : Project Information : NC 28203 23-102-0033 01102 Hart & Hickman (Charlotte) 2923 South Tryon St. Ste 100 Bo Cappleman Charlotte Received : 04/12/2023 MBS-002 Report Date : 04/26/2023 Sample ID : Lab No : Sampled:SSV-3 93553 Matrix: 4/12/2023 12:05 Air Analytical Method: Prep Method: Test Results Units MDL MQL By Analytical Batch Date / Time Analyzed DF TO-15 Prep TO-15 Prep Batch(es):V32132 04/18/23 09:00 31.8 µg/m3 0.202 4.75Acetone 1 04/18/23 21:29 V32152ENM 0.424 J µg/m3 0.073 1.60Benzene 1 04/18/23 21:29 V32152ENM <0.147 µg/m3 0.147 10.4Benzyl Chloride 1 04/18/23 21:29 V32152ENM <0.150 µg/m3 0.150 3.35Bromodichloromethane 1 04/18/23 21:29 V32152ENM <0.153 µg/m3 0.153 5.17Bromoform 1 04/18/23 21:29 V32152ENM <0.115 µg/m3 0.115 1.94Bromomethane 1 04/18/23 21:29 V32152ENM <0.328 µg/m3 0.328 1.111,3-Butadiene 1 04/18/23 21:29 V32152ENM 0.647 J µg/m3 0.060 6.23Carbon Disulfide 1 04/18/23 21:29 V32152ENM <0.155 µg/m3 0.155 3.15 Carbon Tetrachloride 1 04/18/23 21:29 V32152ENM <0.107 µg/m3 0.107 2.30Chlorobenzene 1 04/18/23 21:29 V32152ENM <0.208 µg/m3 0.208 4.26Chlorodibromomethane 1 04/18/23 21:29 V32152ENM <0.164 µg/m3 0.164 1.32Chloroethane 1 04/18/23 21:29 V32152ENM 0.512 J µg/m3 0.086 2.44Chloroform 1 04/18/23 21:29 V32152ENM 0.600 J µg/m3 0.067 1.03Chloromethane 1 04/18/23 21:29 V32152ENM 2.40 J µg/m3 0.161 3.44Cyclohexane 1 04/18/23 21:29 V32152ENM <0.151 µg/m3 0.151 3.84 1,2-Dibromoethane 1 04/18/23 21:29 V32152ENM <0.096 µg/m3 0.096 3.011,2-Dichlorobenzene 1 04/18/23 21:29 V32152ENM 7.95 J µg/m3 0.174 12.01,3-Dichlorobenzene 1 04/18/23 21:29 V32152ENM <0.186 µg/m3 0.186 3.011,4-Dichlorobenzene 1 04/18/23 21:29 V32152ENM 8.33 µg/m3 0.134 2.47Dichlorodifluoromethane 1 04/18/23 21:29 V32152ENM <0.101 µg/m3 0.101 2.021,1-Dichloroethane 1 04/18/23 21:29 V32152ENM <0.129 µg/m3 0.129 2.021,2-Dichloroethane 1 04/18/23 21:29 V32152ENM Qualifiers/ Definitions Dilution FactorDFAnalyte detected in blankB Method Quantitation LimitMQLEstimated valueJ Page 16 of 34 , REPORT OF ANALYSISReport Number : Project Information : NC 28203 23-102-0033 01102 Hart & Hickman (Charlotte) 2923 South Tryon St. Ste 100 Bo Cappleman Charlotte Received : 04/12/2023 MBS-002 Report Date : 04/26/2023 Sample ID : Lab No : Sampled:SSV-3 93553 Matrix: 4/12/2023 12:05 Air Analytical Method: Prep Method: Test Results Units MDL MQL By Analytical Batch Date / Time Analyzed DF TO-15 Prep TO-15 Prep Batch(es):V32132 04/18/23 09:00 <0.107 µg/m3 0.107 1.981,1-Dichloroethene 1 04/18/23 21:29 V32152ENM <0.095 µg/m3 0.095 1.98cis-1,2-Dichloroethene 1 04/18/23 21:29 V32152ENM <0.108 µg/m3 0.108 1.98trans-1,2-Dichloroethene 1 04/18/23 21:29 V32152ENM <0.205 µg/m3 0.205 2.311,2-Dichloropropane 1 04/18/23 21:29 V32152ENM <0.622 µg/m3 0.622 3.501,2-Dichlorotetrafluoroethane 1 04/18/23 21:29 V32152ENM <0.178 µg/m3 0.178 2.27cis-1,3-Dichloropropene 1 04/18/23 21:29 V32152ENM <0.178 µg/m3 0.178 2.27trans-1,3-Dichloropropene 1 04/18/23 21:29 V32152ENM <0.435 µg/m3 0.435 1.801,4-Dioxane 1 04/18/23 21:29 V32152ENM <0.136 µg/m3 0.136 1.80 Ethyl Acetate 1 04/18/23 21:29 V32152ENM 0.338 J µg/m3 0.106 2.17Ethylbenzene 1 04/18/23 21:29 V32152ENM <0.128 µg/m3 0.128 2.464-Ethyltoluene 1 04/18/23 21:29 V32152ENM 0.613 J µg/m3 0.561 3.831,1,2-Trichloro-1,2,2-trifluoroethane 1 04/18/23 21:29 V32152ENM 0.426 J µg/m3 0.143 2.05Heptane 1 04/18/23 21:29 V32152ENM <0.330 µg/m3 0.330 5.33Hexachlorobutadiene 1 04/18/23 21:29 V32152ENM 0.986 J µg/m3 0.047 1.76n-Hexane 1 04/18/23 21:29 V32152ENM <0.285 µg/m3 0.285 2.05 2-Hexanone 1 04/18/23 21:29 V32152ENM 79.1 µg/m3 0.139 4.92Isopropyl Alcohol 1 04/18/23 21:29 V32152ENM 2.72 µg/m3 0.224 1.47Methyl Ethyl Ketone (MEK)1 04/18/23 21:29 V32152ENM <0.033 µg/m3 0.033 1.80Methyl tert-butyl ether (MTBE)1 04/18/23 21:29 V32152ENM 0.356 J µg/m3 0.121 2.054-Methyl-2-Pentanone 1 04/18/23 21:29 V32152ENM 23.9 µg/m3 0.488 1.74Methylene Chloride 1 04/18/23 21:29 V32152ENM <0.183 µg/m3 0.183 2.62Naphthalene 1 04/18/23 21:29 V32152ENM Qualifiers/ Definitions Dilution FactorDFAnalyte detected in blankB Method Quantitation LimitMQLEstimated valueJ Page 17 of 34 , REPORT OF ANALYSISReport Number : Project Information : NC 28203 23-102-0033 01102 Hart & Hickman (Charlotte) 2923 South Tryon St. Ste 100 Bo Cappleman Charlotte Received : 04/12/2023 MBS-002 Report Date : 04/26/2023 Sample ID : Lab No : Sampled:SSV-3 93553 Matrix: 4/12/2023 12:05 Air Analytical Method: Prep Method: Test Results Units MDL MQL By Analytical Batch Date / Time Analyzed DF TO-15 Prep TO-15 Prep Batch(es):V32132 04/18/23 09:00 <0.242 µg/m3 0.242 0.860Propene 1 04/18/23 21:29 V32152ENM 0.421 J µg/m3 0.124 2.13Styrene 1 04/18/23 21:29 V32152ENM <0.104 µg/m3 0.104 3.431,1,2,2-Tetrachloroethane 1 04/18/23 21:29 V32152ENM <0.181 µg/m3 0.181 3.39Tetrachloroethene 1 04/18/23 21:29 V32152ENM 0.710 J µg/m3 0.107 1.47Tetrahydrofuran 1 04/18/23 21:29 V32152ENM 2.10 µg/m3 0.090 1.88Toluene 1 04/18/23 21:29 V32152ENM <0.209 µg/m3 0.209 3.711,2,4-Trichlorobenzene 1 04/18/23 21:29 V32152ENM <0.144 µg/m3 0.144 2.731,1,1-Trichloroethane 1 04/18/23 21:29 V32152ENM <0.087 µg/m3 0.087 2.73 1,1,2-Trichloroethane 1 04/18/23 21:29 V32152ENM <0.199 µg/m3 0.199 2.15Trichloroethene 1 04/18/23 21:29 V32152ENM 14.7 µg/m3 0.130 2.81Trichlorofluoromethane 1 04/18/23 21:29 V32152ENM 4.09 µg/m3 0.110 2.461,2,4-Trimethylbenzene 1 04/18/23 21:29 V32152ENM <0.236 µg/m3 0.236 2.461,3,5-Trimethylbenzene 1 04/18/23 21:29 V32152ENM <0.224 µg/m3 0.224 1.76Vinyl Acetate 1 04/18/23 21:29 V32152ENM <0.127 µg/m3 0.127 1.28Vinyl Chloride 1 04/18/23 21:29 V32152ENM 0.373 J µg/m3 0.157 2.17 o-Xylene 1 04/18/23 21:29 V32152ENM 4.32 J µg/m3 0.217 5.65m,p-Xylene 1 04/18/23 21:29 V32152ENM 4.69 J µg/m3 0.157 2.17Xylene (Total)1 04/18/23 21:29 V32152 Surrogate: 4-Bromofluorobenzene 97.5 Limits: 70-130%04/18/23 21:291 ENM V32152 Qualifiers/ Definitions Dilution FactorDFAnalyte detected in blankB Method Quantitation LimitMQLEstimated valueJ Page 18 of 34 , REPORT OF ANALYSISReport Number : Project Information : NC 28203 23-102-0033 01102 Hart & Hickman (Charlotte) 2923 South Tryon St. Ste 100 Bo Cappleman Charlotte Received : 04/12/2023 MBS-002 Report Date : 04/26/2023 Sample ID : Lab No : Sampled:SSV-1 93554 Matrix: 4/12/2023 11:08 Air Analytical Method: Prep Method: Test Results Units MDL MQL By Analytical Batch Date / Time Analyzed DF TO-15 Prep TO-15 Prep Batch(es):V32427 04/25/23 09:00 39.7 µg/m3 0.202 4.75Acetone 1 04/26/23 03:15 V32433ENM 0.571 J µg/m3 0.073 1.60Benzene 1 04/26/23 03:15 V32433ENM <0.147 µg/m3 0.147 10.4Benzyl Chloride 1 04/26/23 03:15 V32433ENM <0.150 µg/m3 0.150 3.35Bromodichloromethane 1 04/26/23 03:15 V32433ENM <0.153 µg/m3 0.153 5.17Bromoform 1 04/26/23 03:15 V32433ENM <0.115 µg/m3 0.115 1.94Bromomethane 1 04/26/23 03:15 V32433ENM <0.328 µg/m3 0.328 1.111,3-Butadiene 1 04/26/23 03:15 V32433ENM 0.470 JB µg/m3 0.060 6.23Carbon Disulfide 1 04/26/23 03:15 V32433ENM <0.155 µg/m3 0.155 3.15 Carbon Tetrachloride 1 04/26/23 03:15 V32433ENM <0.107 µg/m3 0.107 2.30Chlorobenzene 1 04/26/23 03:15 V32433ENM <0.208 µg/m3 0.208 4.26Chlorodibromomethane 1 04/26/23 03:15 V32433ENM <0.164 µg/m3 0.164 1.32Chloroethane 1 04/26/23 03:15 V32433ENM <0.086 µg/m3 0.086 2.44Chloroform 1 04/26/23 03:15 V32433ENM <0.067 µg/m3 0.067 1.03Chloromethane 1 04/26/23 03:15 V32433ENM <0.161 µg/m3 0.161 3.44Cyclohexane 1 04/26/23 03:15 V32433ENM <0.151 µg/m3 0.151 3.84 1,2-Dibromoethane 1 04/26/23 03:15 V32433ENM <0.096 µg/m3 0.096 3.011,2-Dichlorobenzene 1 04/26/23 03:15 V32433ENM 9.69 J µg/m3 0.174 12.01,3-Dichlorobenzene 1 04/26/23 03:15 V32433ENM <0.186 µg/m3 0.186 3.011,4-Dichlorobenzene 1 04/26/23 03:15 V32433ENM 2.31 J µg/m3 0.134 2.47Dichlorodifluoromethane 1 04/26/23 03:15 V32433ENM <0.101 µg/m3 0.101 2.021,1-Dichloroethane 1 04/26/23 03:15 V32433ENM <0.129 µg/m3 0.129 2.021,2-Dichloroethane 1 04/26/23 03:15 V32433ENM Qualifiers/ Definitions Dilution FactorDFAnalyte detected in blankB Method Quantitation LimitMQLEstimated valueJ Page 19 of 34 , REPORT OF ANALYSISReport Number : Project Information : NC 28203 23-102-0033 01102 Hart & Hickman (Charlotte) 2923 South Tryon St. Ste 100 Bo Cappleman Charlotte Received : 04/12/2023 MBS-002 Report Date : 04/26/2023 Sample ID : Lab No : Sampled:SSV-1 93554 Matrix: 4/12/2023 11:08 Air Analytical Method: Prep Method: Test Results Units MDL MQL By Analytical Batch Date / Time Analyzed DF TO-15 Prep TO-15 Prep Batch(es):V32427 04/25/23 09:00 <0.107 µg/m3 0.107 1.981,1-Dichloroethene 1 04/26/23 03:15 V32433ENM <0.095 µg/m3 0.095 1.98cis-1,2-Dichloroethene 1 04/26/23 03:15 V32433ENM <0.108 µg/m3 0.108 1.98trans-1,2-Dichloroethene 1 04/26/23 03:15 V32433ENM <0.205 µg/m3 0.205 2.311,2-Dichloropropane 1 04/26/23 03:15 V32433ENM <0.622 µg/m3 0.622 3.501,2-Dichlorotetrafluoroethane 1 04/26/23 03:15 V32433ENM <0.178 µg/m3 0.178 2.27cis-1,3-Dichloropropene 1 04/26/23 03:15 V32433ENM <0.178 µg/m3 0.178 2.27trans-1,3-Dichloropropene 1 04/26/23 03:15 V32433ENM 2.84 µg/m3 0.435 1.801,4-Dioxane 1 04/26/23 03:15 V32433ENM 0.565 J µg/m3 0.136 1.80 Ethyl Acetate 1 04/26/23 03:15 V32433ENM <0.106 µg/m3 0.106 2.17Ethylbenzene 1 04/26/23 03:15 V32433ENM 3.57 µg/m3 0.128 2.464-Ethyltoluene 1 04/26/23 03:15 V32433ENM <0.561 µg/m3 0.561 3.831,1,2-Trichloro-1,2,2-trifluoroethane 1 04/26/23 03:15 V32433ENM <0.143 µg/m3 0.143 2.05Heptane 1 04/26/23 03:15 V32433ENM <0.330 µg/m3 0.330 5.33Hexachlorobutadiene 1 04/26/23 03:15 V32433ENM 0.412 J µg/m3 0.047 1.76n-Hexane 1 04/26/23 03:15 V32433ENM 0.979 J µg/m3 0.285 2.05 2-Hexanone 1 04/26/23 03:15 V32433ENM 115 µg/m3 0.139 4.92Isopropyl Alcohol 1 04/26/23 03:15 V32433ENM 4.82 µg/m3 0.224 1.47Methyl Ethyl Ketone (MEK)1 04/26/23 03:15 V32433ENM <0.033 µg/m3 0.033 1.80Methyl tert-butyl ether (MTBE)1 04/26/23 03:15 V32433ENM 1.23 J µg/m3 0.121 2.054-Methyl-2-Pentanone 1 04/26/23 03:15 V32433ENM 15.6 µg/m3 0.488 1.74Methylene Chloride 1 04/26/23 03:15 V32433ENM <0.183 µg/m3 0.183 2.62Naphthalene 1 04/26/23 03:15 V32433ENM Qualifiers/ Definitions Dilution FactorDFAnalyte detected in blankB Method Quantitation LimitMQLEstimated valueJ Page 20 of 34 , REPORT OF ANALYSISReport Number : Project Information : NC 28203 23-102-0033 01102 Hart & Hickman (Charlotte) 2923 South Tryon St. Ste 100 Bo Cappleman Charlotte Received : 04/12/2023 MBS-002 Report Date : 04/26/2023 Sample ID : Lab No : Sampled:SSV-1 93554 Matrix: 4/12/2023 11:08 Air Analytical Method: Prep Method: Test Results Units MDL MQL By Analytical Batch Date / Time Analyzed DF TO-15 Prep TO-15 Prep Batch(es):V32427 04/25/23 09:00 <0.242 µg/m3 0.242 0.860Propene 1 04/26/23 03:15 V32433ENM 3.31 µg/m3 0.124 2.13Styrene 1 04/26/23 03:15 V32433ENM <0.104 µg/m3 0.104 3.431,1,2,2-Tetrachloroethane 1 04/26/23 03:15 V32433ENM 0.671 J µg/m3 0.181 3.39Tetrachloroethene 1 04/26/23 03:15 V32433ENM 1.24 J µg/m3 0.107 1.47Tetrahydrofuran 1 04/26/23 03:15 V32433ENM 1.07 J µg/m3 0.090 1.88Toluene 1 04/26/23 03:15 V32433ENM <0.209 µg/m3 0.209 3.711,2,4-Trichlorobenzene 1 04/26/23 03:15 V32433ENM <0.144 µg/m3 0.144 2.731,1,1-Trichloroethane 1 04/26/23 03:15 V32433ENM <0.087 µg/m3 0.087 2.73 1,1,2-Trichloroethane 1 04/26/23 03:15 V32433ENM <0.199 µg/m3 0.199 2.15Trichloroethene 1 04/26/23 03:15 V32433ENM 1.44 J µg/m3 0.130 2.81Trichlorofluoromethane 1 04/26/23 03:15 V32433ENM 3.48 µg/m3 0.110 2.461,2,4-Trimethylbenzene 1 04/26/23 03:15 V32433ENM <0.236 µg/m3 0.236 2.461,3,5-Trimethylbenzene 1 04/26/23 03:15 V32433ENM <0.224 µg/m3 0.224 1.76Vinyl Acetate 1 04/26/23 03:15 V32433ENM <0.127 µg/m3 0.127 1.28Vinyl Chloride 1 04/26/23 03:15 V32433ENM 0.399 J µg/m3 0.157 2.17 o-Xylene 1 04/26/23 03:15 V32433ENM 3.06 J µg/m3 0.217 5.65m,p-Xylene 1 04/26/23 03:15 V32433ENM 3.46 J µg/m3 0.157 2.17Xylene (Total)1 04/26/23 03:15 V32433 Surrogate: 4-Bromofluorobenzene 97.5 Limits: 70-130%04/26/23 03:151 ENM V32433 Qualifiers/ Definitions Dilution FactorDFAnalyte detected in blankB Method Quantitation LimitMQLEstimated valueJ Page 21 of 34 Quality Control Data 23-102-0033Report No: Project Description: Client ID:Hart & Hickman (Charlotte) MBS-002 QC Prep Batch Method: Volatile Organic Compounds in Air- GC/MS TO-15 V32152QC Analytical Batch(es): Analysis Method: Analysis Description: TO-15 Prep QC Prep:V32132 Associated Lab Samples: 93550, 93551, 93552, 93553 LRB-V32132 Matrix: AIRLab Reagent Blank Parameter AnalyzedMQLMDLBlank ResultUnits % Recovery % Rec Limits 04/18/23 13:464.750.2020.752µg/m3Acetone 04/18/23 13:461.600.073<0.073µg/m3Benzene 04/18/23 13:4610.40.147<0.147µg/m3Benzyl Chloride 04/18/23 13:463.350.150<0.150µg/m3Bromodichloromethane 04/18/23 13:465.170.153<0.153µg/m3Bromoform 04/18/23 13:461.940.115<0.115µg/m3Bromomethane 04/18/23 13:461.110.328<0.328µg/m31,3-Butadiene 04/18/23 13:466.230.060<0.060µg/m3Carbon Disulfide 04/18/23 13:463.150.155<0.155µg/m3Carbon Tetrachloride 04/18/23 13:462.300.107<0.107µg/m3Chlorobenzene 04/18/23 13:464.260.208<0.208µg/m3Chlorodibromomethane 04/18/23 13:461.320.164<0.164µg/m3Chloroethane 04/18/23 13:462.440.086<0.086µg/m3Chloroform 04/18/23 13:461.030.067<0.067µg/m3Chloromethane 04/18/23 13:463.440.161<0.161µg/m3Cyclohexane 04/18/23 13:463.840.151<0.151µg/m31,2-Dibromoethane 04/18/23 13:463.010.096<0.096µg/m31,2-Dichlorobenzene 04/18/23 13:4612.00.174<0.174µg/m31,3-Dichlorobenzene 04/18/23 13:463.010.186<0.186µg/m31,4-Dichlorobenzene 04/18/23 13:462.470.134<0.134µg/m3Dichlorodifluoromethane 04/18/23 13:462.020.101<0.101µg/m31,1-Dichloroethane 04/18/23 13:462.020.129<0.129µg/m31,2-Dichloroethane 04/18/23 13:461.980.107<0.107µg/m31,1-Dichloroethene 04/18/23 13:461.980.095<0.095µg/m3cis-1,2-Dichloroethene 04/18/23 13:461.980.108<0.108µg/m3trans-1,2-Dichloroethene 04/18/23 13:462.310.205<0.205µg/m31,2-Dichloropropane 04/18/23 13:463.500.622<0.622µg/m31,2-Dichlorotetrafluoroethane Page 1 of 10Date:04/26/2023 03:27 PM Page 22 of 34 Quality Control Data 23-102-0033Report No: Project Description: Client ID:Hart & Hickman (Charlotte) MBS-002 QC Prep Batch Method: Volatile Organic Compounds in Air- GC/MS TO-15 V32152QC Analytical Batch(es): Analysis Method: Analysis Description: TO-15 Prep QC Prep:V32132 Associated Lab Samples: 93550, 93551, 93552, 93553 LRB-V32132 Matrix: AIRLab Reagent Blank Parameter AnalyzedMQLMDLBlank ResultUnits % Recovery % Rec Limits 04/18/23 13:462.270.178<0.178µg/m3cis-1,3-Dichloropropene 04/18/23 13:462.270.178<0.178µg/m3trans-1,3-Dichloropropene 04/18/23 13:461.800.435<0.435µg/m31,4-Dioxane 04/18/23 13:461.800.136<0.136µg/m3Ethyl Acetate 04/18/23 13:462.170.106<0.106µg/m3Ethylbenzene 04/18/23 13:462.460.128<0.128µg/m34-Ethyltoluene 04/18/23 13:463.830.561<0.561µg/m31,1,2-Trichloro-1,2,2-trifluoroethane 04/18/23 13:462.050.143<0.143µg/m3Heptane 04/18/23 13:465.330.330<0.330µg/m3Hexachlorobutadiene 04/18/23 13:461.760.047<0.047µg/m3n-Hexane 04/18/23 13:462.050.285<0.285µg/m32-Hexanone 04/18/23 13:464.920.1392.28µg/m3Isopropyl Alcohol 04/18/23 13:461.470.224<0.224µg/m3Methyl Ethyl Ketone (MEK) 04/18/23 13:461.800.033<0.033µg/m3Methyl tert-butyl ether (MTBE) 04/18/23 13:462.050.121<0.121µg/m34-Methyl-2-Pentanone 04/18/23 13:461.740.488<0.488µg/m3Methylene Chloride 04/18/23 13:462.620.183<0.183µg/m3Naphthalene 04/18/23 13:460.8600.242<0.242µg/m3Propene 04/18/23 13:462.130.124<0.124µg/m3Styrene 04/18/23 13:463.430.104<0.104µg/m31,1,2,2-Tetrachloroethane 04/18/23 13:463.390.181<0.181µg/m3Tetrachloroethene 04/18/23 13:461.470.107<0.107µg/m3Tetrahydrofuran 04/18/23 13:461.880.090<0.090µg/m3Toluene 04/18/23 13:463.710.209<0.209µg/m31,2,4-Trichlorobenzene 04/18/23 13:462.730.144<0.144µg/m31,1,1-Trichloroethane 04/18/23 13:462.730.087<0.087µg/m31,1,2-Trichloroethane 04/18/23 13:462.150.199<0.199µg/m3Trichloroethene Page 2 of 10Date:04/26/2023 03:27 PM Page 23 of 34 Quality Control Data 23-102-0033Report No: Project Description: Client ID:Hart & Hickman (Charlotte) MBS-002 QC Prep Batch Method: Volatile Organic Compounds in Air- GC/MS TO-15 V32152QC Analytical Batch(es): Analysis Method: Analysis Description: TO-15 Prep QC Prep:V32132 Associated Lab Samples: 93550, 93551, 93552, 93553 LRB-V32132 Matrix: AIRLab Reagent Blank Parameter AnalyzedMQLMDLBlank ResultUnits % Recovery % Rec Limits 04/18/23 13:462.810.130<0.130µg/m3Trichlorofluoromethane 04/18/23 13:462.460.110<0.110µg/m31,2,4-Trimethylbenzene 04/18/23 13:462.460.236<0.236µg/m31,3,5-Trimethylbenzene 04/18/23 13:461.760.224<0.224µg/m3Vinyl Acetate 04/18/23 13:461.280.127<0.127µg/m3Vinyl Chloride 04/18/23 13:462.170.157<0.157µg/m3o-Xylene 04/18/23 13:465.650.217<0.217µg/m3m,p-Xylene 04/18/23 13:464-Bromofluorobenzene (S)93.5 70-130 LCS-V32132Laboratory Control Sample Parameter LCS %RecLCS Result Spike Conc.Units % Rec Limits 12715.111.9µg/m3Acetone 70-130 11418.316.0µg/m3Benzene 70-130 12732.925.9µg/m3Benzyl Chloride 70-130 11739.133.5µg/m3Bromodichloromethane 70-130 12062.251.7µg/m3Bromoform 70-130 12724.619.4µg/m3Bromomethane 70-130 12413.811.1µg/m31,3-Butadiene 70-130 12819.915.6µg/m3Carbon Disulfide 70-130 11736.831.5µg/m3Carbon Tetrachloride 70-130 11827.223.0µg/m3Chlorobenzene 70-130 11850.442.6µg/m3Chlorodibromomethane 70-130 12716.713.2µg/m3Chloroethane 70-130 11628.424.4µg/m3Chloroform 70-130 12412.810.3µg/m3Chloromethane 70-130 10317.717.2µg/m3Cyclohexane 70-130 Page 3 of 10Date:04/26/2023 03:27 PM Page 24 of 34 Quality Control Data 23-102-0033Report No: Project Description: Client ID:Hart & Hickman (Charlotte) MBS-002 QC Prep Batch Method: Volatile Organic Compounds in Air- GC/MS TO-15 V32152QC Analytical Batch(es): Analysis Method: Analysis Description: TO-15 Prep QC Prep:V32132 LCS-V32132Laboratory Control Sample Parameter LCS %RecLCS Result Spike Conc.Units % Rec Limits 10239.338.4µg/m31,2-Dibromoethane 70-130 11935.730.1µg/m31,2-Dichlorobenzene 70-130 12437.230.1µg/m31,3-Dichlorobenzene 70-130 11935.730.1µg/m31,4-Dichlorobenzene 70-130 12631.024.7µg/m3Dichlorodifluoromethane 70-130 12525.220.2µg/m31,1-Dichloroethane 70-130 11723.720.2µg/m31,2-Dichloroethane 70-130 12825.319.8µg/m31,1-Dichloroethene 70-130 12625.019.8µg/m3cis-1,2-Dichloroethene 70-130 12725.219.8µg/m3trans-1,2-Dichloroethene 70-130 11225.823.1µg/m31,2-Dichloropropane 70-130 12744.335.0µg/m31,2-Dichlorotetrafluoroethane 70-130 11826.722.7µg/m3cis-1,3-Dichloropropene 70-130 11826.722.7µg/m3trans-1,3-Dichloropropene 70-130 11019.818.0µg/m31,4-Dioxane 70-130 12121.818.0µg/m3Ethyl Acetate 70-130 11825.521.7µg/m3Ethylbenzene 70-130 10926.924.6µg/m34-Ethyltoluene 70-130 12849.138.3µg/m31,1,2-Trichloro-1,2,2-trifluoroethane 70-130 12024.520.5µg/m3Heptane 70-130 11661.653.3µg/m3Hexachlorobutadiene 70-130 12722.317.6µg/m3n-Hexane 70-130 12225.020.5µg/m32-Hexanone 70-130 12715.612.3µg/m3Isopropyl Alcohol 70-130 12718.814.8µg/m3Methyl Ethyl Ketone (MEK)70-130 12221.918.0µg/m3Methyl tert-butyl ether (MTBE)70-130 12024.520.5µg/m34-Methyl-2-Pentanone 70-130 Page 4 of 10Date:04/26/2023 03:27 PM Page 25 of 34 Quality Control Data 23-102-0033Report No: Project Description: Client ID:Hart & Hickman (Charlotte) MBS-002 QC Prep Batch Method: Volatile Organic Compounds in Air- GC/MS TO-15 V32152QC Analytical Batch(es): Analysis Method: Analysis Description: TO-15 Prep QC Prep:V32132 LCS-V32132Laboratory Control Sample Parameter LCS %RecLCS Result Spike Conc.Units % Rec Limits 12822.317.4µg/m3Methylene Chloride 70-130 10828.226.2µg/m3Naphthalene 70-130 12510.88.61µg/m3Propene 70-130 11825.221.3µg/m3Styrene 70-130 11639.834.3µg/m31,1,2,2-Tetrachloroethane 70-130 11438.633.9µg/m3Tetrachloroethene 70-130 11416.814.7µg/m3Tetrahydrofuran 70-130 11221.018.8µg/m3Toluene 70-130 11542.737.1µg/m31,2,4-Trichlorobenzene 70-130 11631.727.3µg/m31,1,1-Trichloroethane 70-130 11932.527.3µg/m31,1,2-Trichloroethane 70-130 11330.526.9µg/m3Trichloroethene 70-130 12735.728.1µg/m3Trichlorofluoromethane 70-130 11327.724.6µg/m31,2,4-Trimethylbenzene 70-130 11528.424.6µg/m31,3,5-Trimethylbenzene 70-130 12622.117.6µg/m3Vinyl Acetate 70-130 12516.012.8µg/m3Vinyl Chloride 70-130 12326.621.7µg/m3o-Xylene 70-130 10947.543.4µg/m3m,p-Xylene 70-130 96.34-Bromofluorobenzene (S)70-130 Page 5 of 10Date:04/26/2023 03:27 PM Page 26 of 34 Quality Control Data 23-102-0033Report No: Project Description: Client ID:Hart & Hickman (Charlotte) MBS-002 QC Prep Batch Method: Volatile Organic Compounds in Air- GC/MS TO-15 V32433QC Analytical Batch(es): Analysis Method: Analysis Description: TO-15 Prep QC Prep:V32427 Associated Lab Samples: 93554 LRB-V32427 Matrix: AIRLab Reagent Blank Parameter AnalyzedMQLMDLBlank ResultUnits % Recovery % Rec Limits 04/25/23 15:004.750.202<0.202µg/m3Acetone 04/25/23 15:001.600.073<0.073µg/m3Benzene 04/25/23 15:0010.40.147<0.147µg/m3Benzyl Chloride 04/25/23 15:003.350.150<0.150µg/m3Bromodichloromethane 04/25/23 15:005.170.153<0.153µg/m3Bromoform 04/25/23 15:001.940.115<0.115µg/m3Bromomethane 04/25/23 15:001.110.328<0.328µg/m31,3-Butadiene 04/25/23 15:006.230.0601.18µg/m3Carbon Disulfide 04/25/23 15:003.150.155<0.155µg/m3Carbon Tetrachloride 04/25/23 15:002.300.107<0.107µg/m3Chlorobenzene 04/25/23 15:004.260.208<0.208µg/m3Chlorodibromomethane 04/25/23 15:001.320.164<0.164µg/m3Chloroethane 04/25/23 15:002.440.086<0.086µg/m3Chloroform 04/25/23 15:001.030.067<0.067µg/m3Chloromethane 04/25/23 15:003.440.161<0.161µg/m3Cyclohexane 04/25/23 15:003.840.151<0.151µg/m31,2-Dibromoethane 04/25/23 15:003.010.096<0.096µg/m31,2-Dichlorobenzene 04/25/23 15:0012.00.174<0.174µg/m31,3-Dichlorobenzene 04/25/23 15:003.010.186<0.186µg/m31,4-Dichlorobenzene 04/25/23 15:002.470.134<0.134µg/m3Dichlorodifluoromethane 04/25/23 15:002.020.101<0.101µg/m31,1-Dichloroethane 04/25/23 15:002.020.129<0.129µg/m31,2-Dichloroethane 04/25/23 15:001.980.107<0.107µg/m31,1-Dichloroethene 04/25/23 15:001.980.095<0.095µg/m3cis-1,2-Dichloroethene 04/25/23 15:001.980.108<0.108µg/m3trans-1,2-Dichloroethene 04/25/23 15:002.310.205<0.205µg/m31,2-Dichloropropane 04/25/23 15:003.500.622<0.622µg/m31,2-Dichlorotetrafluoroethane Page 6 of 10Date:04/26/2023 03:27 PM Page 27 of 34 Quality Control Data 23-102-0033Report No: Project Description: Client ID:Hart & Hickman (Charlotte) MBS-002 QC Prep Batch Method: Volatile Organic Compounds in Air- GC/MS TO-15 V32433QC Analytical Batch(es): Analysis Method: Analysis Description: TO-15 Prep QC Prep:V32427 Associated Lab Samples: 93554 LRB-V32427 Matrix: AIRLab Reagent Blank Parameter AnalyzedMQLMDLBlank ResultUnits % Recovery % Rec Limits 04/25/23 15:002.270.178<0.178µg/m3cis-1,3-Dichloropropene 04/25/23 15:002.270.178<0.178µg/m3trans-1,3-Dichloropropene 04/25/23 15:001.800.435<0.435µg/m31,4-Dioxane 04/25/23 15:001.800.136<0.136µg/m3Ethyl Acetate 04/25/23 15:002.170.106<0.106µg/m3Ethylbenzene 04/25/23 15:002.460.128<0.128µg/m34-Ethyltoluene 04/25/23 15:003.830.561<0.561µg/m31,1,2-Trichloro-1,2,2-trifluoroethane 04/25/23 15:002.050.143<0.143µg/m3Heptane 04/25/23 15:005.330.330<0.330µg/m3Hexachlorobutadiene 04/25/23 15:001.760.047<0.047µg/m3n-Hexane 04/25/23 15:002.050.285<0.285µg/m32-Hexanone 04/25/23 15:004.920.139<0.139µg/m3Isopropyl Alcohol 04/25/23 15:001.470.224<0.224µg/m3Methyl Ethyl Ketone (MEK) 04/25/23 15:001.800.033<0.033µg/m3Methyl tert-butyl ether (MTBE) 04/25/23 15:002.050.121<0.121µg/m34-Methyl-2-Pentanone 04/25/23 15:001.740.488<0.488µg/m3Methylene Chloride 04/25/23 15:002.620.183<0.183µg/m3Naphthalene 04/25/23 15:000.8600.242<0.242µg/m3Propene 04/25/23 15:002.130.124<0.124µg/m3Styrene 04/25/23 15:003.430.104<0.104µg/m31,1,2,2-Tetrachloroethane 04/25/23 15:003.390.181<0.181µg/m3Tetrachloroethene 04/25/23 15:001.470.107<0.107µg/m3Tetrahydrofuran 04/25/23 15:001.880.090<0.090µg/m3Toluene 04/25/23 15:003.710.209<0.209µg/m31,2,4-Trichlorobenzene 04/25/23 15:002.730.144<0.144µg/m31,1,1-Trichloroethane 04/25/23 15:002.730.087<0.087µg/m31,1,2-Trichloroethane 04/25/23 15:002.150.199<0.199µg/m3Trichloroethene Page 7 of 10Date:04/26/2023 03:27 PM Page 28 of 34 Quality Control Data 23-102-0033Report No: Project Description: Client ID:Hart & Hickman (Charlotte) MBS-002 QC Prep Batch Method: Volatile Organic Compounds in Air- GC/MS TO-15 V32433QC Analytical Batch(es): Analysis Method: Analysis Description: TO-15 Prep QC Prep:V32427 Associated Lab Samples: 93554 LRB-V32427 Matrix: AIRLab Reagent Blank Parameter AnalyzedMQLMDLBlank ResultUnits % Recovery % Rec Limits 04/25/23 15:002.810.130<0.130µg/m3Trichlorofluoromethane 04/25/23 15:002.460.110<0.110µg/m31,2,4-Trimethylbenzene 04/25/23 15:002.460.236<0.236µg/m31,3,5-Trimethylbenzene 04/25/23 15:001.760.224<0.224µg/m3Vinyl Acetate 04/25/23 15:001.280.127<0.127µg/m3Vinyl Chloride 04/25/23 15:002.170.157<0.157µg/m3o-Xylene 04/25/23 15:005.650.217<0.217µg/m3m,p-Xylene 04/25/23 15:004-Bromofluorobenzene (S)89.3 70-130 LCS-V32427Laboratory Control Sample Parameter LCS %RecLCS Result Spike Conc.Units % Rec Limits 10112.011.9µg/m3Acetone 70-130 95.015.216.0µg/m3Benzene 70-130 94.924.625.9µg/m3Benzyl Chloride 70-130 89.530.033.5µg/m3Bromodichloromethane 70-130 96.750.051.7µg/m3Bromoform 70-130 10620.519.4µg/m3Bromomethane 70-130 98.110.911.1µg/m31,3-Butadiene 70-130 11517.915.6µg/m3Carbon Disulfide 70-130 91.128.731.5µg/m3Carbon Tetrachloride 70-130 10223.423.0µg/m3Chlorobenzene 70-130 10042.742.6µg/m3Chlorodibromomethane 70-130 10513.813.2µg/m3Chloroethane 70-130 98.324.024.4µg/m3Chloroform 70-130 10711.010.3µg/m3Chloromethane 70-130 96.516.617.2µg/m3Cyclohexane 70-130 Page 8 of 10Date:04/26/2023 03:27 PM Page 29 of 34 Quality Control Data 23-102-0033Report No: Project Description: Client ID:Hart & Hickman (Charlotte) MBS-002 QC Prep Batch Method: Volatile Organic Compounds in Air- GC/MS TO-15 V32433QC Analytical Batch(es): Analysis Method: Analysis Description: TO-15 Prep QC Prep:V32427 LCS-V32427Laboratory Control Sample Parameter LCS %RecLCS Result Spike Conc.Units % Rec Limits 10239.138.4µg/m31,2-Dibromoethane 70-130 10932.730.1µg/m31,2-Dichlorobenzene 70-130 10230.830.1µg/m31,3-Dichlorobenzene 70-130 10431.230.1µg/m31,4-Dichlorobenzene 70-130 10726.424.7µg/m3Dichlorodifluoromethane 70-130 11122.520.2µg/m31,1-Dichloroethane 70-130 95.019.220.2µg/m31,2-Dichloroethane 70-130 11222.119.8µg/m31,1-Dichloroethene 70-130 10921.519.8µg/m3cis-1,2-Dichloroethene 70-130 11422.619.8µg/m3trans-1,2-Dichloroethene 70-130 91.321.123.1µg/m31,2-Dichloropropane 70-130 10637.035.0µg/m31,2-Dichlorotetrafluoroethane 70-130 90.720.622.7µg/m3cis-1,3-Dichloropropene 70-130 90.720.622.7µg/m3trans-1,3-Dichloropropene 70-130 91.116.418.0µg/m31,4-Dioxane 70-130 10418.818.0µg/m3Ethyl Acetate 70-130 10222.221.7µg/m3Ethylbenzene 70-130 95.523.524.6µg/m34-Ethyltoluene 70-130 11544.038.3µg/m31,1,2-Trichloro-1,2,2-trifluoroethane 70-130 92.619.020.5µg/m3Heptane 70-130 95.851.153.3µg/m3Hexachlorobutadiene 70-130 11019.417.6µg/m3n-Hexane 70-130 10221.020.5µg/m32-Hexanone 70-130 95.111.712.3µg/m3Isopropyl Alcohol 70-130 10715.814.8µg/m3Methyl Ethyl Ketone (MEK)70-130 10919.718.0µg/m3Methyl tert-butyl ether (MTBE)70-130 89.718.420.5µg/m34-Methyl-2-Pentanone 70-130 Page 9 of 10Date:04/26/2023 03:27 PM Page 30 of 34 Quality Control Data 23-102-0033Report No: Project Description: Client ID:Hart & Hickman (Charlotte) MBS-002 QC Prep Batch Method: Volatile Organic Compounds in Air- GC/MS TO-15 V32433QC Analytical Batch(es): Analysis Method: Analysis Description: TO-15 Prep QC Prep:V32427 LCS-V32427Laboratory Control Sample Parameter LCS %RecLCS Result Spike Conc.Units % Rec Limits 11419.817.4µg/m3Methylene Chloride 70-130 10226.826.2µg/m3Naphthalene 70-130 1069.158.61µg/m3Propene 70-130 93.820.021.3µg/m3Styrene 70-130 99.734.234.3µg/m31,1,2,2-Tetrachloroethane 70-130 89.630.433.9µg/m3Tetrachloroethene 70-130 96.514.214.7µg/m3Tetrahydrofuran 70-130 91.417.218.8µg/m3Toluene 70-130 10037.137.1µg/m31,2,4-Trichlorobenzene 70-130 93.025.427.3µg/m31,1,1-Trichloroethane 70-130 10127.627.3µg/m31,1,2-Trichloroethane 70-130 89.524.126.9µg/m3Trichloroethene 70-130 10329.028.1µg/m3Trichlorofluoromethane 70-130 96.723.824.6µg/m31,2,4-Trimethylbenzene 70-130 10425.624.6µg/m31,3,5-Trimethylbenzene 70-130 11319.917.6µg/m3Vinyl Acetate 70-130 10513.512.8µg/m3Vinyl Chloride 70-130 10222.221.7µg/m3o-Xylene 70-130 92.640.243.4µg/m3m,p-Xylene 70-130 99.44-Bromofluorobenzene (S)70-130 Page 10 of 10Date:04/26/2023 03:27 PM Page 31 of 34 Fed Ex UPS US Postal Client Lab Courier Other : Shipment Receipt Form Customer Number: Customer Name: Report Number:23-102-0033 Hart & Hickman (Charlotte) 01102 Shipping Method Shipping container/cooler uncompromised? Thermometer ID:N/A Chain of Custody (COC) present?Yes No Yes No Not Present Yes No Not Present Yes No COC agrees with sample label(s)? Yes No COC properly completed Samples in proper containers? Sample containers intact? Sufficient sample volume for indicated test(s)? All samples received within holding time? Cooler temperature in compliance? Yes No Yes No Yes No Yes No Yes No Yes NoCooler/Samples arrived at the laboratory on ice. Samples were considered acceptable as cooling process had begun. Yes No Yes No N/A Yes No N/A Yes No N/ASoil VOA method 5035 – compliance criteria met Water - Sample containers properly preserved Water - VOA vials free of headspace Yes No N/A Trip Blanks received with VOAs Low concentration EnCore samplers (48 hr) High concentration pre-weighed (methanol -14 d) Low conc pre-weighed vials (Sod Bis -14 d) High concentration container (48 hr) Custody seals intact on shipping container/cooler? Custody seals intact on sample bottles? Number of coolers/boxes received Yes No 1 Signature:Angelo Norvell Date & Time:04/12/2023 16:43:23 Special precautions or instructions included? Comments: Page 32 of 34 Page 33 of 34 Page 34 of 34 Appendix C DEQ Risk Calculator Input/Output Forms Version Date: Basis: Site Name: Site Address: DEQ Section: Site ID: Exposure Unit ID: Submittal Date: Reviewed By: Combined Sub-Slab Vapor Data North Carolina Department of Environmental Quality Risk Calculator Cleveland Avenue Homes E. 17th Street, E. 15th Street, and Woodland Avenue DEQ DWM Brownfields Program MBS-002 January 2023 November 2022 EPA RSL Table Prepared By:Hart & Hickman, PC Hart & Hickman, PC North Carolina DEQ Risk Calculator Complete Exposure Pathways Version Date: January 2023 Basis: November 2022 EPA RSL Table Site ID: MBS-002 Exposure Unit ID: Combined Sub-Slab Vapor Data Note: Risk output will only be calculated for complete exposure pathways. Receptor Pathway Check box if pathway complete Soil Groundwater Use Soil Groundwater Use Construction Worker Soil Soil Surface Water Groundwater to Indoor Air Soil Gas to Indoor Air Indoor Air Groundwater to Indoor Air Soil Gas to Indoor Air Indoor Air Source Soil Source Groundwater Source Soil Source Groundwater Resident Non-Residential Worker CONTAMINANT MIGRATION PATHWAYS Groundwater Surface Water Input Form 1A VAPOR INTRUSION PATHWAYS DIRECT CONTACT SOIL AND WATER PATHWAYS Resident Non-Residential Worker Recreator/Trespasser North Carolina DEQ Risk Calculator Exposure Point ConcentrationsVersion Date: January 2023Basis: November 2022 EPA RSL TableSite ID: MBS-002Exposure Unit ID: Combined Sub-Slab Vapor DataDescription of Exposure Point Concentration Selection:Exposure Point Concentration (ug/m3)Notes: CAS Number ChemicalMinimum Concentration (Qualifier)Maximum Concentration (Qualifier)UnitsLocation of Maximum ConcentrationDetection FrequencyRange of Detection LimitsConcentration Used for ScreeningBackground ValueScreening Toxicity Value (Screening Level) (n/c)Potential ARAR/TBC ValuePotential ARAR/TBC SourceCOPC Flag (Y/N)Rationale for Selection or Deletion39.7 67-64-1 Acetoneug/m30.571J71-43-2 Benzeneug/m30.647J75-15-0 Carbon Disulfideug/m30.512J67-66-3 Chloroformug/m30.6J74-87-3 Chloromethaneug/m32.72J110-82-7 Cyclohexaneug/m38.33 75-71-8 Dichlorodifluoromethaneug/m32.84 123-91-1 Dioxane, 1,4-ug/m30.565J141-78-6 Ethyl Acetateug/m30.338J100-41-4 Ethylbenzeneug/m31.24J109-99-9 ~Tetrahydrofuranug/m30.426J142-82-5 Heptane, N-ug/m30.986J110-54-3 Hexane, N-ug/m30.979J591-78-6 Hexanone, 2-ug/m3115 67-63-0 Isopropanolug/m34.82 78-93-3 Methyl Ethyl Ketone (2-Butanone)ug/m31.23J108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone)ug/m323.9 75-09-2 Methylene Chlorideug/m33.31 100-42-5 Styreneug/m30.671J127-18-4 Tetrachloroethyleneug/m32.1 108-88-3 Tolueneug/m30.628J76-13-1 Trichloro-1,2,2-trifluoroethane, 1,1,2-ug/m314.7 75-69-4 Trichlorofluoromethaneug/m34.09 95-63-6 Trimethylbenzene, 1,2,4-ug/m33.29 108-67-8 Trimethylbenzene, 1,3,5-ug/m34.69J1330-20-7 Xylenesug/m3Input Form 2DSoil Gas Exposure Point Concentration TableNote: Chemicals highlighted in orange are non-volatile chemicals. Since these chemicals do not pose a vapor intrusion risk, no risk values are calculated for these chemicals.If the chemical list is changed from a prior calculator run, remember to select "See All Chemicals" on the data output sheet or newly added chemicals will not be included in risk calculationsNorth Carolina DEQ Risk Calculator Risk for Individual Pathways Output Form 1A Version Date: January 2023 Basis: November 2022 EPA RSL Table Site ID: MBS-002 Exposure Unit ID: Combined Sub-Slab Vapor Data Receptor Pathway Carcinogenic Risk Hazard Index Risk exceeded? Soil NC NC NC Groundwater Use* NC NC NC Soil NC NC NC Groundwater Use* NC NC NC Construction Worker Soil NC NC NC Soil NC NC NC Surface Water* NC NC NC Receptor Pathway Carcinogenic Risk Hazard Index Risk exceeded? Groundwater to Indoor Air NC NC NC Soil Gas to Indoor Air 3.4E-07 3.1E-02 NO Indoor Air NC NC NC Groundwater to Indoor Air NC NC NC Soil Gas to Indoor Air NC NC NC Indoor Air NC NC NC Pathway Source Source Soil NC Source Groundwater NC Source Soil NC Source Groundwater NC Groundwater Exceedence of 2L at Receptor? Exceedence of 2L at Receptor? 1. If lead concentrations were entered in the exposure point concentration tables, see the individual calculator sheets for lead concentrations in comparison to screening levels. Note that lead is not included in cumulative risk calculations. Notes: 3. NM = Not modeled, user did not check this pathway as complete. 4. NC = Pathway not calculated, required contaminant migration parameters were not entered. DIRECT CONTACT SOIL AND WATER CALCULATORS Resident Non-Residential Worker Recreator/Trespasser 2. * = If concentrations in groundwater exceed the NC 2L Standards or IMAC, or concentrations in surface water exceed the NC 2B Standards, appropriate remediation and/or institutional control measures will be necessary to be eligible for a risk-based closure. Surface Water Exceedence of 2B at Receptor? Exceedence of 2B at Receptor? VAPOR INTRUSION CALCULATORS Resident Non-Residential Worker CONTAMINANT MIGRATION CALCULATORS Target Receptor Concentrations Exceeded? North Carolina DEQ Risk Calculator DEQ Risk Calculator - Vapor Intrusion - Resident Soil Gas to Indoor Air Version Date: January 2023 Basis: November 2022 EPA RSL Table Site ID: MBS-002 Exposure Unit ID: Combined Sub-Slab Vapor Data CAS # Chemical Name: Soil Gas Concentration (ug/m3) Calculated Indoor Air Concentration (ug/m3) Target Indoor Air Conc. for Carcinogens @ TCR = 1E-06 Target Indoor Air Conc. for Non- Carcinogens @ THQ = 0.2 Calculated Carcinogenic Risk Calculated Non- Carcinogenic Hazard Quotient 67-64-1 Acetone 39.7 1.191 - - 71-43-2 Benzene 0.571 0.01713 3.6E-01 6.3E+00 4.8E-08 5.5E-04 75-15-0 Carbon Disulfide 0.647 0.01941 - 1.5E+02 2.7E-05 67-66-3 Chloroform 0.512 0.01536 1.2E-01 2.0E+01 1.3E-07 1.5E-04 74-87-3 Chloromethane 0.6 0.018 - 1.9E+01 1.9E-04 110-82-7 Cyclohexane 2.72 0.0816 - 1.3E+03 1.3E-05 75-71-8 Dichlorodifluoromethane 8.33 0.2499 - 2.1E+01 2.4E-03 123-91-1 Dioxane, 1,4- 2.84 0.0852 5.6E-01 6.3E+00 1.5E-07 2.7E-03 141-78-6 Ethyl Acetate 0.565 0.01695 - 1.5E+01 2.3E-04 100-41-4 Ethylbenzene 0.338 0.01014 1.1E+00 2.1E+02 9.0E-09 9.7E-06 109-99-9 ~Tetrahydrofuran 1.24 0.0372 - 4.2E+02 1.8E-05 142-82-5 Heptane, N-0.426 0.01278 - 8.3E+01 3.1E-05 110-54-3 Hexane, N- 0.986 0.02958 - 1.5E+02 4.1E-05 591-78-6 Hexanone, 2-0.979 0.02937 - 6.3E+00 9.4E-04 67-63-0 Isopropanol 115 3.45 - 4.2E+01 1.7E-02 78-93-3 Methyl Ethyl Ketone (2-Butanone) 4.82 0.1446 - 1.0E+03 2.8E-05 108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone) 1.23 0.0369 - 6.3E+02 1.2E-05 75-09-2 Methylene Chloride 23.9 0.717 1.0E+02 1.3E+02 7.1E-09 1.1E-03 100-42-5 Styrene 3.31 0.0993 - 2.1E+02 9.5E-05 127-18-4 Tetrachloroethylene 0.671 0.02013 1.1E+01 8.3E+00 1.9E-09 4.8E-04 108-88-3 Toluene 2.1 0.063 - 1.0E+03 1.2E-05 76-13-1 Trichloro-1,2,2-trifluoroethane, 1,1,2- 0.628 0.01884 - 1.0E+03 3.6E-06 75-69-4 Trichlorofluoromethane 14.7 0.441 - - 95-63-6 Trimethylbenzene, 1,2,4- 4.09 0.1227 - 1.3E+01 2.0E-03 108-67-8 Trimethylbenzene, 1,3,5- 3.29 0.0987 - 1.3E+01 1.6E-03 1330-20-7 Xylenes 4.69 0.1407 - 2.1E+01 1.3E-03 Cumulative: 3.4E-07 3.1E-02 All concentrations are in ug/m3 Output Form 3B Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Since these chemicals do not pose a vapor intrusion risk, no risk values are calculated for these chemicals. North Carolina DEQ Risk Calculator