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Home My WebLink About11037_Double Oaks_ March 2023 O&M Report Via Email May 26, 2023 NCDEQ – Division of Waste Management Brownfields Program 1646 Mail Service Center Raleigh, NC 27699-1646 Attn: Ms. Carolyn Minnich Re: 1st Quarter 2023 MVIMS O&M Report with Sub-Slab Vapor Sampling Results Phase 8 Brightwalk Development Double Oaks Brownfields Site Charlotte, Mecklenburg County Brownfields Project No. 11037-07-060 H&H Project No. CHP-041 Dear Carolyn: 1.0 Introduction On behalf of DreamKey Partners, LLC, Hart & Hickman, PC (H&H) is providing the 1st Quarter 2023 Methane Vapor Intrusion Mitigation System (MVIMS) Operations and Maintenance (O&M) report for the Phase 8 Brightwalk Development located in Charlotte, North Carolina (Site). In addition, this report includes sub-slab vapor sampling results. The Phase 8 Brightwalk Development is part of the Double Oaks Brownfields Site (Brownfields Project No. 11037-07- 060). A Site location map is provided as Figure 1. The Double Oaks Brownfields property is developed with residential apartments, townhomes, and single-family homes. The Phase 8 Development includes eight (8) single-family homes located along Double Oaks Road which is near the former Double Oaks Landfill. As discussed in previous reports, MVIMSs designed by Geoscience Group, LLC (Geoscience) were installed for each home as part of the Phase 8 construction. The addresses for the single-family homes with Ms. Carolyn Minnich May 26, 2023 Page 2 https://harthick.sharepoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/Charlotte Mecklenburg Housing Partnership - CHP/CHP-041 Double Oaks Methane/Report/2023 Reports/2023 O&M Report.docx MVIMSs include: 2531, 2535, 2539, 2601, 2605, 2609, 2613, and 2617 Double Oaks Road (Double Oaks Homes). The Phase 8 construction was completed in approximately December 2017/January 2018. Each property consists of a two-story dwelling and detached garage. The detached garages are located in the rear of each property and closest to the former Double Oaks Landfill (Figure 2). As discussed in the Methane VIMS Inspection and O&M Report – Revision 1 dated January 9, 2023, results of the MVIMS inspections and O&M visits conducted in October 2021 through November 2022 indicated that a low point in the MVIMS piping between the home and the detached garage resulted in water accumulation in the MVIMS and prevented the radial blower from creating a vacuum below the slab of the home. As also discussed in the report, although a vacuum was not present below the slab of the home due to water accumulation in the MVIMS piping, concentrations of methane were not detected below the slabs of the homes during the October 2021 through November 2022 O&M visits. To further evaluate potential subsurface methane migration at the Site and MVIMS influence, H&H installed vapor pins in the garages of each of the eight homes in July 2022. Methane and differential pressure readings were collected from the vapor pins in the garages in July 2022 and November 2022. Results of the differential pressure readings collected from below each garage slab indicated the presence of a vacuum greater than 0.016 inches of water column (WIC). Methane was not detected. Because methane was not detected below the slabs of the homes and garages, H&H determined that the risk for methane vapor intrusion was low and modifications to the MVIMS were not warranted. To further demonstrate that the risk for methane vapor intrusion is low, H&H recommended quarterly MVIMS O&M visits and inspections for a period of 1-year. Per DEQs request, H&H proposed the collection of sub-slab vapor samples from below each home for laboratory analysis of volatile organic compounds (VOCs) by EPA Method 8260. In preparation of the sub-slab sampling, H&H prepared and submitted the Sub-Slab Sampling Work Ms. Carolyn Minnich May 26, 2023 Page 3 https://harthick.sharepoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/Charlotte Mecklenburg Housing Partnership - CHP/CHP-041 Double Oaks Methane/Report/2023 Reports/2023 O&M Report.docx Plan – Revision 1 (Work Plan) to DEQ on February 27, 2023. The Work Plan was approved by DEQ in a letter dated February 27, 2023. The sub-slab sampling was subsequently conducted during the March 2023 MVIMS inspection and O&M visit. The following report includes a description of the methods and results of the quarterly MVIMS inspection and O&M visits in March 2023 and sub-slab sampling. 2.0 MVIMS Inspection & O&M The MVIMS O&M visits were conducted between March 29 and April 3, 2023 (March 2023 O&M visits). The MVIMS O&M included confirming MVIMS fan operation, confirming the presence and operation of methane sensors, and the collection of methane and sub-slab differential pressure readings from sample ports installed in the homes and garages. Differential pressure readings were collected utilizing a digital manometer capable of detecting differential pressure equal to or greater than 0.001 WIC. Methane readings were collected utilizing a calibrated Landtec GEM 5000™. As part of the O&M activities methane readings were also collected from landfill gas probes LG-23, LG-24, and LG-25. Calibration logs for the GEM 5000™ are provided in Appendix A. The methane sensor is designed with an audible alert that is activated if methane is detected at 25% of the lower explosive limit (LEL). The methane sensor is also equipped with an LED screen that flashes red and displays “Gas / Evacuate” when the alarm is activated. The specification sheet for the methane sensor provided in Appendix C. Consistent with previous MVIMS O&M visits, H&H completed a Methane and Vapor Intrusion Mitigation System Inspection Form (Inspection Form) for each home. Inspection Forms completed by H&H personnel during the March 2023 MVIMS Inspection and O&M are provided in Appendix B. A summary of the March 2023 MVIMS Inspection and O&M visit is included below. Ms. Carolyn Minnich May 26, 2023 Page 4 https://harthick.sharepoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/Charlotte Mecklenburg Housing Partnership - CHP/CHP-041 Double Oaks Methane/Report/2023 Reports/2023 O&M Report.docx  MVIMS fans were observed to be operational at the time of the O&M visit.  Methane was not detected in the sub-slab sample ports installed inside the homes or garages.  Differential pressure measurements collected from the sub-slab sample ports in the homes did not indicate the presence of a differential pressure greater than -0.016 WIC except for the rear sample port in 2613 Double Oaks (-0.031 WIC).  Differential pressure measurements collected from the sub-slab sample ports in each of the garages indicated the presence of a differential pressure greater than -0.016 WIC ranging from -0.080 WIC to -2.588 WIC.  Two methane sensors were confirmed to be present in each home and one methane sensor was confirmed to be present in each garage. Each sensor was observed to be functioning properly.  Methane was not detected in landfill gas probes LG-23, LG-24, or LG-25 (Table 1). Results of the March 2023 O&M visit indicates the potential for methane vapor intrusion remains low. 3.0 Sub-Slab Vapor Sampling H&H proposed the collection of sub-slab vapor samples from a minimum of four of the eight single-family homes and offered the option to collect sub-slab samples to the remaining four homeowners. Each of the remaining four homeowners elected to have the sub-slab vapor sample collected. As such, a total of eight (8) sub-slab vapor samples (SS-2539, SS-2605, SS-2601, SS- 2535, SS-2613, SS-2531, SS-2609, SS-2617) were collected. In addition, for quality assurance/quality control (QA/QC) purposes, one duplicate sub-slab sample (SS-DUP) was collected using a laboratory-supplied T-fitting which allowed for the collection of two samples from one sampling point simultaneously. The duplicate sample was collected from sample location SS-2605. Ms. Carolyn Minnich May 26, 2023 Page 5 https://harthick.sharepoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/Charlotte Mecklenburg Housing Partnership - CHP/CHP-041 Double Oaks Methane/Report/2023 Reports/2023 O&M Report.docx In accordance with the approved Work Plan, sub-slab vapor samples for VOC analysis were collected from the rear sub-slab sample port in each home (Figure 3). The sub-slab samples were collected utilizing individually certified 1-liter stainless steel Summa® canisters connected to an air-flow regulator calibrated by the laboratory to collect the sub-slab sample at a rate of approximately 100 ml/min. A brief description of the sub-slab sampling methodology is provided below. Prior to collection of the soil gas samples, a “shut-in” test was conducted on the sampling train for each Summa® canister assembly and helium leak checks were conducted at each monitoring point. The purpose of the shut-in test and helium leak check was to ensure short-circuiting with ambient air did not occur during sampling. A brief description of the shut-in test and helium leak testing procedures is provided below. The shut-in tests were conducted by connecting the flow regulator with the vacuum gauge to the 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. The shut-in test was considered successful if the vacuum reading remained the same. Each of the Summa® canisters utilized in the sub-slab sampling passed the shut-in test. Summa® Canister Shut-in Test Forms completed by H&H personnel are provided in Appendix B. Following the shut-in test, the Summa® canister was connected to the sample point via Teflon® sample tubing using a brass nut and ferrule assembly to create an air-tight seal and the leak check was performed. The leak check was performed by constructing a shroud over the sampling train (including the canister) and flooding the shroud with helium gas. A calibrated helium gas detector was then utilized to measure helium concentrations within the shroud. Once helium concentrations stabilized within the shroud, the sample tubing was purged outside of the shroud using a syringe and a three-way valve to collect purged soil gas into a Tedlar® bag. The purged soil gas was then analyzed using the helium gas detector to ensure that helium concentrations in Ms. Carolyn Minnich May 26, 2023 Page 6 https://harthick.sharepoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/Charlotte Mecklenburg Housing Partnership - CHP/CHP-041 Double Oaks Methane/Report/2023 Reports/2023 O&M Report.docx the sub-slab point were less than 10% of the helium concentrations measured within the shroud. Results of the leak testing conducted at each sampling point did not indicate the presence of helium in the purged soil gas. As such, the leak tests were successful. Following the successful leak checks, the valve on the flow regulator was fully opened to allow collection of the sub-slab vapor samples. The vacuum readings on the Summa® canister were recorded prior to and following the sampling period to ensure adequate sample volume was collected. A vacuum of approximately 5 inches of mercury was maintained within the canisters at the conclusion of the sampling event in accordance with DEQ DWM guidance. Sampling forms with vacuum readings for each of the Summa® canisters are provided in Appendix C. Following sample collection, the Summa® canisters were shipped to Con-Test Analytical Laboratory under standard chain of custody protocols for analysis of VOCs by EPA Method TO- 15. A summary of the laboratory analytical results of the sub-slab vapor sampling is provided below. Sub-Slab VOC Vapor Results Laboratory analytical results of the sub-slab vapor samples collected indicated the presence of multiple VOCs above laboratory method detection limits which is typical. Chloroform was detected above the DEQ Residential Sub-Slab Soil Gas Screening Level (SGSL) of 4.1 µg/m3 in samples SS-2531 (140 µg/m3), SS-2535 (96 µg/m3), and SS-2605 (4.2 µg/m3). Bromodichloromethane was also detected above the DEQ Residential SGSL of 2.5 µg/m3 in sample SS-2535 (6.9 µg/m3). No other compounds were detected in the sub-slab vapor samples above their respective DEQ Residential SGSLs. Trichloroethylene (TCE) was not detected in the sub-slab vapor samples above laboratory method detection limits. A summary of the VOC sub- slab vapor analytical data is provided in Table 2, and the laboratory analytical report is provided in Appendix D. DEQ SGSLs are conservative and based upon a Target Cancer Risk (TCR) of 1 x 10-6 for potential carcinogenic effects and a cumulative Target Hazard Quotient (THQ) of 0.2 for Ms. Carolyn Minnich May 26, 2023 Page 7 https://harthick.sharepoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/Charlotte Mecklenburg Housing Partnership - CHP/CHP-041 Double Oaks Methane/Report/2023 Reports/2023 O&M Report.docx potential non-carcinogenic effects. Vapor intrusion mitigation or additional assessment is not typically warranted if the calculated cumulative lifetime incremental carcinogenic risk (LICR) is 1 x 10-4 or less and the calculated cumulative hazard index (HI) is 1.0 or less. The HI is the sum of THQ values for each detected compound. H&H utilized the most recent DEQ Risk Calculator (January 2023) to further evaluate cumulative risks associated with compound concentrations detected in the sub-slab vapor samples, H&H used the highest compound concentrations detected in any sub-slab vapor sample to model hypothetical “worst-case” risks for the sub-slab vapor to indoor air vapor intrusion pathway under a residential use scenario. Risk calculator results indicate that under a hypothetical worst-case scenario for the sub-slab vapor to indoor air vapor intrusion pathway for residential use, the cumulative LICR is 3.7 x 10-5 and the cumulative HI is 0.056. Based on results of the sub-slab vapor sampling activities, the cumulative carcinogenic and noncarcinogenic vapor intrusion risks do not exceed the DEQ acceptable LICR and HI levels of 1x10-4 and 1.0, respectively. A copy of the risk calculator results is provided in Appendix E. 5.0 Summary H&H conducted MVIMS Inspection and O&M visits on the eight (8) single family homes located in the Brightwalk Phase 8 Development in March 2023. The MVIMS Inspection and O&M visit also included the collection of sub-slab samples for VOC analysis from each of the homes. Results of the March 2023 MVIMS Inspection and O&M visits did not indicate the presence of methane below the slabs of the homes or garages. As such, the potential for methane vapor intrusion into the homes remains low. Results of the VOC sub-slab vapor sampling conducted in March 2023 did not indicate a potential for VOC vapor intrusion risk above DEQ acceptable thresholds for LICR or the HI. No additional VOC sub-slab vapor assessment is warranted at this time. Tables Table 1Summary of Landfill Gas Probe DataBrightwalk Phase 8 DevelopmentCharlotte, North CarolinaH&H Project No. CHP-041Sample ID Sample DateCH4 (%) CO2 (%) O2 (%)CO (ppm)H2S (ppm)Static Pressure(in. H2O)5/21/2021 0.0 5.7 11.6 NM NM NM10/1/21 0.0 4.4 9.2 NM NM NM3/1/22 0.0 3.8 8.8 NM NM NM7/25/22 0.0 9.4 10.7 NM NM NM11/18/2022* 0.0 1.8 20.0 0.0 0.0 -0.033/29/23 0.0 4.2 13.8 0.0 0.0 0.05/21/21 0.0 9.4 10.5 NM NM NM10/1/21 0.0 10.1 10.8 NM NM NM3/1/22 0.0 11.3 11.1 NM NM NM7/25/22 0.0 15.3 6.2 NM NM NM11/16/22 0.0 11.1 10.5 0.0 0.0 -0.013/29/23 0.0 9.0 13.8 0.0 0.0 0.05/21/21 0.0 10.8 2.9 NM NM NM10/1/21 0.0 11.8 3.1 NM NM NM3/1/22 0.0 12.2 3.2 NM NM NM7/25/22 0.0 14.9 3.4 NM NM NM11/16/22 0.0 14.8 7.4 0.0 0.0 0.003/29/23 0.0 5.7 11.0 0.0 0.0 0.0Notes:Landfilll gas probes installed by URS in August 2015The North Carolina Landfill Gas Monitoring Regulation is 5% methane (100% LEL) at the landfill property line.*Water was removed from LG-23 on November 16, 2022 and sampled on November 18, 2022.Measurements were collected by H&H using a calibrated LANDTEC GEM 5000CH4 = methane; O2 = oxygen; CO2 = carbon dioxide; CO = carbon monoxide; H2S = hydrogen sulfide;in H₂O = inches of water; % = percent by volume of air; ppm = parts per million; NM = not measuredLG-25LG-24LG-23S:\AAA‐Master Projects\Charlotte Mecklenburg Housing Partnership ‐ CHP\CHP‐041 Double Oaks Methane\Report\Aug‐22Table 1 (Page 1 of 1)Hart & Hickman, PC Table 2Summary of Sub-Slab Vapor Analytical DataPhase 8 Brightwalk Development - Double Oaks Brownfields SiteBrownfields Project No. 11037-07-060Charlotte, North CarolinaH&H Job No. CHP-041Sample IDSS-2531 SS-2535 SS-2539 SS-2601 SS-2609 SS-2613 SS-2617Sample DateSample Type Unitsµg/m3VOCs (TO-15)Acetone 15 J<1113 J<1118 J<1117 J 15 J<11NEBenzene<0.48 <0.48 <0.482.0 1.3 1.3 0.55 J 0.52 J<0.4812Bromodichloromethane<0.946.9<0.94 <0.94 <0.94 <0.94 <0.94 <0.94 <0.942.5Carbon Disulfide<0.58 <0.58 <0.58 <0.58 <0.58 <0.58 <0.58 <0.580.62 J 4,900Chloroethane<0.47 <0.47 <0.47 <0.470.93<0.47 <0.47 <0.47 <0.4728,000Chloroform140 96<0.932.14.24.0<0.93 <0.93 <0.934.1Chloromethane 0.37 J<0.33 <0.33 <0.331.6 0.33 J<0.331.7 0.33 J 630Cyclohexane 1.3 1.0 1.0 1.1<0.420.98<0.420.96<0.4242,000Dichlorodifluoromethane (Freon 12) 2.4 1.6 1.5 1.4 1.6 1.4 1.6 1.5 1.7 7001,4-Dioxane<0.60 <0.60 <0.60 <0.602.4 J<0.60 <0.60 <0.60 <0.6019Ethanol 20 V-05, L-03 37 V-05, L-03 17 V-05, L-03 18 V-05, L-03 14 J, V-05, L-03 16 V-05, L-03 16 V-05, L-03 29 V-05, L-03 39 V-05, L-03NEEthylbenzene<0.51 <0.510.73 J 1.9 1.6 1.5<0.510.56 J<0.51374-Ethyltoluene<0.60 <0.60 <0.600.71 J 0.73 J 0.69 J<0.60 <0.60 <0.60NEHeptane 0.54 J<0.52 <0.520.56 J 0.59 J<0.520.57 J<0.52 <0.522,8002-Hexanone (MBK)<0.41 <0.410.56 J<0.410.43 J 0.62 J<0.41 <0.41 <0.412104-Methyl-2-pentanone (MIBK)<0.44 <0.44 <0.440.48 J 0.66 J<0.44 <0.44 <0.44 <0.4421,000Styrene<0.45 <0.45 <0.45 <0.450.53 J 0.51 J<0.45 <0.45 <0.457,000Tetrachloroethylene<1.0 <1.06.0<1.0 <1.0 <1.0 <1.0 <1.0 <1.0280Tetrahydrofuran<0.97 <0.97 <0.97 <0.97 <0.97 <0.971.3 J<0.97 <0.9714,000Toluene 1.4 0.45 J 3.1 9.9 7.9 7.8 2.0 2.4 0.86 35,0001,2,4-Trimethylbenzene 1.2<0.431.0 1.7 2.4 3.1 1.8 2.9<0.434201,3,5-Trimethylbenzene<0.52 <0.52 <0.52 <0.520.59 J 0.53 J<0.52 <0.52 <0.52420m&p-Xylene 1.4 J<0.972.6 5.7 5.7 5.6 1.9 2.2<0.97700o-Xylene 0.63 J<0.441.1 2.3 2.2 2.0 0.83 J 0.89<0.44700DEQ Cumulative Risk Calculator(2)Acceptable Risk LevelsLICR (Worst-Case Residential)<1.0 x 10-4Non-Carcinogenic HI (Worst-Case Residential)<1.0Notes:1) North Carolinia Department of Environmental Quality (DEQ) Vapor Intrusion Sub-Slab & Exterior Soil Gas Screening Levels (SGSLs) dated January 2023.2) DEQ Cumulative Risk Calculator dated January 2023 and is based upon a TCR = 1 x 10-6 and THQ = 0.2.Cumulative LICR and HI calculated using the highest concentration of any compound detected in any sample. Results are compared to DEQ and EPA acceptable risk levels for carcinogenic and non-carcinogenic risks. 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 table above.Bold values indicate an exceedance of the Residential SGSL. VOCs = volatile organic compounds; NE = not established; TCR = Target Cancer Risk; THQ = Target Hazard Quotient; LICR = Lifetime Incremental Cancer Risk; HI = Hazard IndexJ = Compound was detected above the laboratory method detction limit, but below the laboratory reporting limit resulting in a laboratory estimated concentration.V-05 = Continuing calibration verification did not meet method specifications and was biased on the low side for this compound.L-03 = Laboratory fortified blank/laboratory control sample recovery is outside of control limits resulting in a concentration that is likely biased on the low side for this compound.Residential SGSLs (1)3/29/20233.7 x 10-50.056SS-2605/SS-DUPSub-Slab Vaporµg/m3https://harthick.sharepoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/Charlotte Mecklenburg Housing Partnership - CHP/CHP-041 Double Oaks Methane/Report/2023 Reports/Sub-Slab Data/Table 15/5/2023Table 2 (Page 1 of 1)Hart & Hickman, PC Figures 0 2000 4000 APPROXIMATE SCALE IN FEET N U.S.G.S. QUADRANGLE MAP QUADRANGLE 7.5 MINUTE SERIES (TOPOGRAPHIC) NORTH: DERITA, NC 1996 SOUTH: CHARLOTTE EAST, NC 1991 TITLE PROJECT SITE LOCATION MAP BRIGHTWALK PHASE 8 BROWNFIELDS PROJECT 11037-01-060 CHARLOTTE, NORTH CAROLINA DATE: JOB NO: REVISION NO: FIGURE: 06-04-2021 0 1CHP-041 SITE LG-24 LG-23 LG-25 REVISION NO. 0 JOB NO. CHP-041 DATE: 12-8-22 FIGURE NO. 2 DREAMKEY PARTNERS BRIGHTWALK PHASE 8 DOUBLE OAKS ROAD CHARLOTTE, NORTH CAROLINA SITE MAP LEGEND PARCEL BOUNDARY LANDFILL GAS PROBE BRIGHTWALK PHASE 8 DEVELOPMENT PROPERTY ID PROPOSED LOCATION OF METHANE MONITORING POINT 2923 South Tryon Street-Suite 100 Charlotte, North Carolina 28203 704-586-0007(p) 704-586-0373(f) License # C-1269 / #C-245 Geology NOTES: 1. AERIAL IMAGERY OBTAINED FROM MECKLENBURG COUNTY GIS (2022).IRWIN CREEKINTERSTATE-77DOUBLE OAKS ROADMOSS LANEWO O D W A R D A V E N U E MOS S L A N E CLOSED/CAPPED LANDFILL AREA PROPERTY ID ADDRESS 1 2531 DOUBLE OAKS ROAD 2 2535 DOUBLE OAKS ROAD 3 2539 DOUBLE OAKS ROAD 4 2601 DOUBLE OAKS ROAD 5 2605 DOUBLE OAKS ROAD 6 2609 DOUBLE OAKS ROAD 7 2613 DOUBLE OAKS ROAD 8 2617 DOUBLE OAKS ROAD S:\AAA-Master Projects\Charlotte Mecklenburg Housing Partnership - CHP\CHP-041 Double Oaks Methane\Report\2022 MVIMS O&M Report\Figures\CHP.041_20221208.dwg, FIG 2, 12/8/2022 10:00:50 AM, shaynes REVISION NO. 0 JOB NO. CHP-041 DATE: 12-8-22 FIGURE NO. 3 DREAMKEY PARTNERS BRIGHTWALK PHASE 8 DOUBLE OAKS ROAD CHARLOTTE, NORTH CAROLINA METHANE VAPOR MITIGATION SYSTEM COMPONENT MAP LEGEND PARCEL BOUNDARY BRIGHTWALK PHASE 8 DEVELOPMENT PROPERTY ID SUB-SLAB SAMPLE PORT UPPER LEVEL METHANE SENSOR LOWER LEVEL METHANE SENSOR METHANE VAPOR MITIGATION FAN AND EXHAUST 2923 South Tryon Street-Suite 100 Charlotte, North Carolina 28203 704-586-0007(p) 704-586-0373(f) License # C-1269 / #C-245 Geology NOTES: 1.AERIAL IMAGERY OBTAINED FROM MECKLENBURG COUNTY GIS (2022).DOUBLE OAKS ROADMOSS LANEMOS S L A N E CLOSED/CAPPED LANDFILL AREA PROPERTY ID ADDRESS 1 2531 DOUBLE OAKS ROAD 2 2535 DOUBLE OAKS ROAD 3 2539 DOUBLE OAKS ROAD 4 2601 DOUBLE OAKS ROAD 5 2605 DOUBLE OAKS ROAD 6 2609 DOUBLE OAKS ROAD 7 2613 DOUBLE OAKS ROAD 8 2617 DOUBLE OAKS ROAD S:\AAA-Master Projects\Charlotte Mecklenburg Housing Partnership - CHP\CHP-041 Double Oaks Methane\Report\2022 MVIMS O&M Report\Figures\CHP.041_20221208.dwg, FIG 3, 12/8/2022 10:03:39 AM, shaynes Appendix A GEM5000 Calibration Log Appendix B MVIMS Inspection and O&M Logs Inspection Date and Time _______________________ HouseAddress_________________________________ H&HPersonel__________________________________ Isthesystemoperationalonarrival?(Yes/No) SystemDifferentialPressure__________"H2O Isdischargepiping(exhaust)visiblyobstructed?(Yes/No) Aretherevisiblegapsorcracksintheslabpresentinaccessibleareasofthegroundfloor?(Yes/No) Ifyes,describe_________________________________________________________________________ _______________________________________________________________________________________ MethaneDetectors: Detector1:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ Detector2:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ Detector3:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ MethaneandDifferentialPressureReadings: IndoorsDownstairs:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ IndoorsUpstairs:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Garage:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______SubͲslabPort(Front) SubͲslabPort(Rear) ^ƵďͲƐůĂďWŽƌƚ;'ĂƌĂŐĞͿ CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______ Anyrepairsormodificationstothehomeorgaragesincelastvisit? ________________________________________________________________________________________ ________________________________________________________________________________________ Doesthehomeowner/occupantreportanymethanealarmssincelastvisit? ________________________________________________________________________________________ ________________________________________________________________________________________ Notes: ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ MVMSInspectionForm DoubleOaksBrownfieldsSite(BrownfieldsNo.11037Ͳ07Ͳ60) BrightwalksPhase8 DoubleOaksRoadCharlotte,NC H&HJobNo.CHP.041 S:\AAAͲMasterProjects\CharlotteMecklenburgHousingPartnershipͲCHP\CHPͲ041DoubleOaksMethane\MVIMSO Hart Hickman, PC CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______ Yes / /No) /No) (Yes/ (Yes/ (Yes/ 3/31/2023 0900 2531 Double Oaks JMS, SMT 2.7 Living Room April 2021 Upstairs Dec 2021 Garage April 2022 0.0 21.7 0 00.178.2 0.0 21.7 0 00.178.2 0.0 21.7 0 00.178.2 0.0 21.4 0 00.378.3 -0.007 0.0 21.6 0 0078.4 -0.009 0.0 21.6 0 00.178.3 -2.588 No No Inspection Date and Time _______________________ HouseAddress_________________________________ H&HPersonel__________________________________ Isthesystemoperationalonarrival?(Yes/No) SystemDifferentialPressure__________"H2O Isdischargepiping(exhaust)visiblyobstructed?(Yes/No) Aretherevisiblegapsorcracksintheslabpresentinaccessibleareasofthegroundfloor?(Yes/No) Ifyes,describe_________________________________________________________________________ _______________________________________________________________________________________ MethaneDetectors: Detector1:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ Detector2:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ Detector3:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ MethaneandDifferentialPressureReadings: IndoorsDownstairs:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ IndoorsUpstairs:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Garage:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______SubͲslabPort(Front) SubͲslabPort(Rear) ^ƵďͲƐůĂďWŽƌƚ;'ĂƌĂŐĞͿ CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______ Anyrepairsormodificationstothehomeorgaragesincelastvisit? ________________________________________________________________________________________ ________________________________________________________________________________________ Doesthehomeowner/occupantreportanymethanealarmssincelastvisit? ________________________________________________________________________________________ ________________________________________________________________________________________ Notes: ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ MVMSInspectionForm DoubleOaksBrownfieldsSite(BrownfieldsNo.11037Ͳ07Ͳ60) BrightwalksPhase8 DoubleOaksRoadCharlotte,NC H&HJobNo.CHP.041 S:\AAAͲMasterProjects\CharlotteMecklenburgHousingPartnershipͲCHP\CHPͲ041DoubleOaksMethane\MVIMSO Hart Hickman, PC CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______ Yes / /No) /No) (Yes/ (Yes/ (Yes/ 3/30/2023 0900 2535 Double Oaks JMS, SMT 1.0 Living Room June 2022 Upstairs Dec 2021 Garage June 2022 0.0 21.7 1.0 00.178.2 0.0 21.8 0 00.178.1 0.0 21.9 0 00.178.0 0.0 21.1 0 00.678.3 -0.003 0.0 21.2 0 00.378.6 -0.005 0.0 21.8 0 0 0..2 78.0 -1.061 No No Inspection Date and Time _______________________ HouseAddress_________________________________ H&HPersonel__________________________________ Isthesystemoperationalonarrival?(Yes/No) SystemDifferentialPressure__________"H2O Isdischargepiping(exhaust)visiblyobstructed?(Yes/No) Aretherevisiblegapsorcracksintheslabpresentinaccessibleareasofthegroundfloor?(Yes/No) Ifyes,describe_________________________________________________________________________ _______________________________________________________________________________________ MethaneDetectors: Detector1:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ Detector2:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ Detector3:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ MethaneandDifferentialPressureReadings: IndoorsDownstairs:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ IndoorsUpstairs:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Garage:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______SubͲslabPort(Front) SubͲslabPort(Rear) ^ƵďͲƐůĂďWŽƌƚ;'ĂƌĂŐĞͿ CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______ Anyrepairsormodificationstothehomeorgaragesincelastvisit? ________________________________________________________________________________________ ________________________________________________________________________________________ Doesthehomeowner/occupantreportanymethanealarmssincelastvisit? ________________________________________________________________________________________ ________________________________________________________________________________________ Notes: ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ MVMSInspectionForm DoubleOaksBrownfieldsSite(BrownfieldsNo.11037Ͳ07Ͳ60) BrightwalksPhase8 DoubleOaksRoadCharlotte,NC H&HJobNo.CHP.041 S:\AAAͲMasterProjects\CharlotteMecklenburgHousingPartnershipͲCHP\CHPͲ041DoubleOaksMethane\MVIMSO Hart Hickman, PC CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______ Yes / /No) /No) (Yes/ (Yes/ (Yes/ 3/29/23 1330 2601 Double Oaks JSH, SMT 2.5 Living Room Feb 2022 Upstairs March 2022 Garage Jan 2021 0.0 21.5 0 00.178.4 0.0 21.6 0 00.178.4 0.0 22.1 1 00.177.8 0.0 21.0 0 00.378.7 0.000 0.0 21.0 0 00.478.7 0.004 0.0 22.1 1 00.177.8 -0.080 No No Inspection Date and Time _______________________ HouseAddress_________________________________ H&HPersonel__________________________________ Isthesystemoperationalonarrival?(Yes/No) SystemDifferentialPressure__________"H2O Isdischargepiping(exhaust)visiblyobstructed?(Yes/No) Aretherevisiblegapsorcracksintheslabpresentinaccessibleareasofthegroundfloor?(Yes/No) Ifyes,describe_________________________________________________________________________ _______________________________________________________________________________________ MethaneDetectors: Detector1:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ Detector2:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ Detector3:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ MethaneandDifferentialPressureReadings: IndoorsDownstairs:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ IndoorsUpstairs:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Garage:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______SubͲslabPort(Front) SubͲslabPort(Rear) ^ƵďͲƐůĂďWŽƌƚ;'ĂƌĂŐĞͿ CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______ Anyrepairsormodificationstothehomeorgaragesincelastvisit? ________________________________________________________________________________________ ________________________________________________________________________________________ Doesthehomeowner/occupantreportanymethanealarmssincelastvisit? ________________________________________________________________________________________ ________________________________________________________________________________________ Notes: ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ MVMSInspectionForm DoubleOaksBrownfieldsSite(BrownfieldsNo.11037Ͳ07Ͳ60) BrightwalksPhase8 DoubleOaksRoadCharlotte,NC H&HJobNo.CHP.041 S:\AAAͲMasterProjects\CharlotteMecklenburgHousingPartnershipͲCHP\CHPͲ041DoubleOaksMethane\MVIMSO Hart Hickman, PC CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______ Yes / /No) /No) (Yes/ (Yes/ (Yes/ 3/29/2023 1200 2605 Double Oaks JSH, SMT 1.4 Living Room March 2020 Upstairs March 2020 Garage Feb 2022 0.0 21.6 0 10.178.4 0.0 21.8 0 00.178.1 0.0 22.3 0 00.177.6 0.0 21.1 0 00.178.7 0.000 0.0 21.4 0 00.178.4 0.004 0.0 22.2 1 00.177.8 -1.452 No No Inspection Date and Time _______________________ HouseAddress_________________________________ H&HPersonel__________________________________ Isthesystemoperationalonarrival?(Yes/No) SystemDifferentialPressure__________"H2O Isdischargepiping(exhaust)visiblyobstructed?(Yes/No) Aretherevisiblegapsorcracksintheslabpresentinaccessibleareasofthegroundfloor?(Yes/No) Ifyes,describe_________________________________________________________________________ _______________________________________________________________________________________ MethaneDetectors: Detector1:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ Detector2:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ Detector3:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ MethaneandDifferentialPressureReadings: IndoorsDownstairs:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ IndoorsUpstairs:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Garage:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______SubͲslabPort(Front) SubͲslabPort(Rear) ^ƵďͲƐůĂďWŽƌƚ;'ĂƌĂŐĞͿ CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______ Anyrepairsormodificationstothehomeorgaragesincelastvisit? ________________________________________________________________________________________ ________________________________________________________________________________________ Doesthehomeowner/occupantreportanymethanealarmssincelastvisit? ________________________________________________________________________________________ ________________________________________________________________________________________ Notes: ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ MVMSInspectionForm DoubleOaksBrownfieldsSite(BrownfieldsNo.11037Ͳ07Ͳ60) BrightwalksPhase8 DoubleOaksRoadCharlotte,NC H&HJobNo.CHP.041 S:\AAAͲMasterProjects\CharlotteMecklenburgHousingPartnershipͲCHP\CHPͲ041DoubleOaksMethane\MVIMSO Hart Hickman, PC CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______ Yes / /No) /No) (Yes/ (Yes/ (Yes/ 3/31/2023 1000 2609 Double Oaks JMS, SMT 1.2 Living Room Aug 2022 Upstairs April 2022 Garage Dec 2021 0.0 21.9 0 00.178.1 0.0 21.8 0 00.178.1 0.0 21.7 0 00.178.2 0.0 21.7 0 00.178.2 0.007 0.0 22.0 0 00.127.9 -0.009 0.0 21.6 0 00.178.3 -1.326 No No Inspection Date and Time _______________________ HouseAddress_________________________________ H&HPersonel__________________________________ Isthesystemoperationalonarrival?(Yes/No) SystemDifferentialPressure__________"H2O Isdischargepiping(exhaust)visiblyobstructed?(Yes/No) Aretherevisiblegapsorcracksintheslabpresentinaccessibleareasofthegroundfloor?(Yes/No) Ifyes,describe_________________________________________________________________________ _______________________________________________________________________________________ MethaneDetectors: Detector1:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ Detector2:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ Detector3:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ MethaneandDifferentialPressureReadings: IndoorsDownstairs:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ IndoorsUpstairs:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Garage:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______SubͲslabPort(Front) SubͲslabPort(Rear) ^ƵďͲƐůĂďWŽƌƚ;'ĂƌĂŐĞͿ CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______ Anyrepairsormodificationstothehomeorgaragesincelastvisit? ________________________________________________________________________________________ ________________________________________________________________________________________ Doesthehomeowner/occupantreportanymethanealarmssincelastvisit? ________________________________________________________________________________________ ________________________________________________________________________________________ Notes: ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ MVMSInspectionForm DoubleOaksBrownfieldsSite(BrownfieldsNo.11037Ͳ07Ͳ60) BrightwalksPhase8 DoubleOaksRoadCharlotte,NC H&HJobNo.CHP.041 S:\AAAͲMasterProjects\CharlotteMecklenburgHousingPartnershipͲCHP\CHPͲ041DoubleOaksMethane\MVIMSO Hart Hickman, PC CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______ Yes / /No) /No) (Yes/ (Yes/ (Yes/ 3/30/2023 1000 2613 Double Oaks JMS 1.1 Living Room April 2022 Upstairs March 2022 Garage August 2022 0.0 21.7 0 00.178.1 0.0 21.5 1.0 0.0 0.1 78.4 0.0 21.8 1.0 0.0 0.0 77.2 0.0 20.9 0.0 0.0 0.2 78.9 -0.014 0.0 20.9 0.0 0.0 0.2 78.9 -0.031 0.0 20.9 0.0 0.0 0.2 78.9 -0.971 No No Inspection Date and Time _______________________ HouseAddress_________________________________ H&HPersonel__________________________________ Isthesystemoperationalonarrival?(Yes/No) SystemDifferentialPressure__________"H2O Isdischargepiping(exhaust)visiblyobstructed?(Yes/No) Aretherevisiblegapsorcracksintheslabpresentinaccessibleareasofthegroundfloor?(Yes/No) Ifyes,describe_________________________________________________________________________ _______________________________________________________________________________________ MethaneDetectors: Detector1:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ Detector2:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ Detector3:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ MethaneandDifferentialPressureReadings: IndoorsDownstairs:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ IndoorsUpstairs:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Garage:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______SubͲslabPort(Front) SubͲslabPort(Rear) ^ƵďͲƐůĂďWŽƌƚ;'ĂƌĂŐĞͿ CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______ Anyrepairsormodificationstothehomeorgaragesincelastvisit? ________________________________________________________________________________________ ________________________________________________________________________________________ Doesthehomeowner/occupantreportanymethanealarmssincelastvisit? ________________________________________________________________________________________ ________________________________________________________________________________________ Notes: ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ MVMSInspectionForm DoubleOaksBrownfieldsSite(BrownfieldsNo.11037Ͳ07Ͳ60) BrightwalksPhase8 DoubleOaksRoadCharlotte,NC H&HJobNo.CHP.041 S:\AAAͲMasterProjects\CharlotteMecklenburgHousingPartnershipͲCHP\CHPͲ041DoubleOaksMethane\MVIMSO Hart Hickman, PC CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______ Yes / /No) /No) (Yes/ (Yes/ (Yes/ 3/29/2023 0900 2539 Double Oaks JSH, SMT 1.0 Kitchen Jan 2021 Upstairs Hall June 2022 Garage Jan 2021 0.0 22.0 0 00.177.8 0.0 21.9 0 00.177.9 0.0 21.6 0 00.178.3 0.0 22.1 0 00.277.7 0.006 0.0 21.3 0 00.278.5 0.020 0.0 21.6 0 00.178.4 -1.290 No No Inspection Date and Time _______________________ HouseAddress_________________________________ H&HPersonel__________________________________ Isthesystemoperationalonarrival?(Yes/No) SystemDifferentialPressure__________"H2O Isdischargepiping(exhaust)visiblyobstructed?(Yes/No) Aretherevisiblegapsorcracksintheslabpresentinaccessibleareasofthegroundfloor?(Yes/No) Ifyes,describe_________________________________________________________________________ _______________________________________________________________________________________ MethaneDetectors: Detector1:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ Detector2:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ Detector3:Location:_______________;Functioning?(Yes/No)Manufacturedate_____________ MethaneandDifferentialPressureReadings: IndoorsDownstairs:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ IndoorsUpstairs:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Garage:CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______SubͲslabPort(Front) SubͲslabPort(Rear) ^ƵďͲƐůĂďWŽƌƚ;'ĂƌĂŐĞͿ CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______ Anyrepairsormodificationstothehomeorgaragesincelastvisit? ________________________________________________________________________________________ ________________________________________________________________________________________ Doesthehomeowner/occupantreportanymethanealarmssincelastvisit? ________________________________________________________________________________________ ________________________________________________________________________________________ Notes: ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ MVMSInspectionForm DoubleOaksBrownfieldsSite(BrownfieldsNo.11037Ͳ07Ͳ60) BrightwalksPhase8 DoubleOaksRoadCharlotte,NC H&HJobNo.CHP.041 S:\AAAͲMasterProjects\CharlotteMecklenburgHousingPartnershipͲCHP\CHPͲ041DoubleOaksMethane\MVIMSO Hart Hickman, PC CH4:______ O2:_______CO:_______H2S:_______ CO2:_______Bal:_______ Diff:_______ Yes / /No) /No) (Yes/ (Yes/ (Yes/ 4/3/2023 1100 2617 Double Oaks JMS 4.1 Living Room Feb 2022 Upstairs July 2021 Garage March 2022 0.0 21.5 0 00.178.4 0.0 21.5 0 00.078.5 0.0 21.1 0 00.078.9 0.0 21.4 0 00.078.6 -0.004 0.0 21.4 0 00.178.5 -0.008 0.0 21.0 0 00.079.0 -1.984 No No Appendix C Shut-in Test and Sampling Forms &Žƌŵ^dͲϭ6XPPD&DQLVWHU6KXWLQ7HVW)LHOG)RUP3URMHFW1RBBBBBBBBBBBBBBBBBBB 6DPSOHUBBBBBBBBBBBBBBBBBBBBBB,QLWLDO3UHVVXUH3DVV"!+J7LPH&DQLVWHU3UHVVXUH3DVV"5HJXODWRU=HUR3UHVVXUH7LPH&DQLVWHU3UHVVXUH3DVV"PPGG\\ +J <HV1R KU +J <HV1R +J KU +J <HV1R6WDUW0LGGOH(QG6WDUW0LGGOH(QG6WDUW0LGGOH(QG6WDUW0LGGOH(QG6WDUW0LGGOH(QG6WDUW0LGGOH(QG& FDQLVWHU,'5 UHJXODWRU,'+J LQFKHVRIPHUFXU\/DVWXSGDWHG1RWHV^ŚƵƚͲ/ŶdĞƐƚƐŚŽƵůĚďĞƉĞƌĨŽƌŵĞĚǁŝƚŚŵĂƚĐŚŝŶŐĐĂŶŝƐƚĞƌǁŝƚŚƌĞŐƵůĂƚŽƌĂƐůŝƐƚĞĚďǇůĂďŽƌĂƚŽƌǇŽŶĐĂŶŝƐƚĞƌƚĂŐ͕ĂŶĚƐŚŽƵůĚůĂƐƚĨŽƌĂĚƵƌĂƟŽŶŽĨĂƚůĞĂƐƚϱŵŝŶƵƚĞƐ͘ZĞŐƵůĂƚŽƌΗĞƌŽΗWƌĞƐƐƵƌĞсƉƌĞƐƐƵƌĞŽĨƌĞŐƵůĂƚŽƌĚĞƚĂĐŚĞĚĨƌŽŵ^ƵŵŵĂ;ŝĨŶŽƚϬΗ,Ő͕ƚŚĞŶƚŚŝƐŶĞĞĚƐƚŽďĞĂĐĐŽƵŶƚĞĚĨŽƌĚƵƌŝŶŐƐĂŵƉůŝŶŐͿ͘^ƵŵŵĂ/ŶŝƚŝĂůWƌĞƐƐƵƌĞсƉƌĞƐƐƵƌĞŽĨ^ƵŵŵĂŝŵŵĞĚŝĞƚĞůǇĂĨƚĞƌĐůŽƐŝŶŐǀĂůǀĞ;ƉƌĞƐƐƵƌĞůŝŬĞůǇƚŽĚĞĐƌĞĂƐĞƐůŝŐŚůƚǇŽŶĐĞǀĂůǀĞŝƐĐůŽƐĞĚͿ͘6DPSOH,'7HVW3HLRG͗Z͗͗Z͗͗Z͗͗Z͗͗Z͗͗Z͗6KXWLQ5HWHVWLIQHHGHG6KXWLQ7HVW1RWHV6XPPD3UHVVXUH&KHFN'DWH͗ͰhƐĞƌƐͰŵǀĂǁƚĞƌͰƌŽƉďŽǆͰǇKƚŚĞƌͰ&ŽƌŵĚŝƚƐͰ/YͲ^^sͰsĂƉŽƌ^ĂŵƉůŝŶŐ&ŽƌŵƐͺsϲ͘Ϭ^ƵďͲ^ůĂďͬ^Žŝů'ĂƐ^ĂŵƉůŝŶŐ^ŚƵƚͲŝŶdĞƐƚ&ŝĞůĚ&Žƌŵ,ĂƌƚΘ,ŝĐŬŵĂŶ͕WCHP-041 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101020 -16NA NA 70100 mL/min44701025 -5SS-26171120 -271 L267404/03/23 10 NA NA 704338100 mL/min1125 -131130 -5 Appendix D Laboratory Analytical Report 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 April 19, 2023 John Lopez Hart & Hickman - Charlotte, NC 2923 South Tryon Street, Suite 100 Charlotte, NC 28203 Project Location: Charlotte, NC Client Job Number: Project Number: CHP-041 Laboratory Work Order Number: 23D0743 Enclosed are results of analyses for samples as received by the laboratory on April 5, 2023. If you have any questions concerning this report, please feel free to contact me. Sincerely, Rebecca Faust Project Manager QA Officer Katherine Allen Laboratory Manager Daren Damboragian Page 1 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL SUMMARY 4/19/2023Hart & Hickman - Charlotte, NC 2923 South Tryon Street, Suite 100 Charlotte, NC 28203 ATTN: John Lopez CHP-041 23D0743 The results of analyses performed on the following samples submitted to the CON-TEST Analytical Laboratory are found in this report. PROJECT LOCATION: PURCHASE ORDER NUMBER: PROJECT NUMBER: REPORT DATE: WORK ORDER NUMBER: FIELD SAMPLE #LAB ID:MATRIX TESTSAMPLE DESCRIPTION SUB LAB Charlotte, NC SS-2539 23D0743-01 Sub Slab - EPA TO-15 SS-2605 23D0743-02 Sub Slab - EPA TO-15 SS-2601 23D0743-03 Sub Slab - EPA TO-15 SS-2535 23D0743-04 Sub Slab - EPA TO-15 SS-2613 23D0743-05 Sub Slab - EPA TO-15 SS-2531 23D0743-06 Sub Slab - EPA TO-15 SS-2609 23D0743-07 Sub Slab - EPA TO-15 SS-2617 23D0743-08 Sub Slab EPA TO-15 SS-DUP 23D0743-09 Sub Slab - EPA TO-15 UNUSED 23D0743-10 - Page 2 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 CASE NARRATIVE SUMMARY All reported results are within defined laboratory quality control objectives unless listed below or otherwise qualified in this report. EPA TO-15 Qualifications: Laboratory fortified blank/laboratory control sample recovery is outside of control limits. Reported value for this compound is likely to be biased on the low side. Analyte & Samples(s) Qualified: L-03 1,2,4-Trichlorobenzene, Ethanol, Hexachlorobutadiene, Isopropanol, Naphthalene 23D0743-01[SS-2539], 23D0743-02[SS-2605], 23D0743-03[SS-2601], 23D0743-04[SS-2535], 23D0743-05[SS-2613], 23D0743-06[SS-2531], 23D0743-07[SS-2609], 23D0743-08[SS-2617], 23D0743-09[SS-DUP], B337295-BLK1, B337295-BS1, B337295-DUP1 Continuing calibration verification (CCV) did not meet method specifications and was biased on the low side for this compound. Analyte & Samples(s) Qualified: V-05 Ethanol 23D0743-01[SS-2539], 23D0743-02[SS-2605], 23D0743-03[SS-2601], 23D0743-04[SS-2535], 23D0743-05[SS-2613], 23D0743-06[SS-2531], 23D0743-07[SS-2609], 23D0743-08[SS-2617], 23D0743-09[SS-DUP], B337295-BLK1, B337295-BS1, B337295-DUP1, S086005-CCV1 The results of analyses reported only relate to samples submitted to the Con-Test Analytical Laboratory for testing. I certify that the analyses listed above, unless specifically listed as subcontracted, if any, were performed under my direction according to the approved methodologies listed in this document, and that based upon my inquiry of those individuals immediately responsible for obtaining the information, the material contained in this report is, to the best of my knowledge and belief, accurate and complete. Lisa A. Worthington Technical Representative Page 3 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-2539 Sample ID: 23D0743-01 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -29 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -5.6 Sampled: 3/29/2023 10:27 Canister ID: 2119 Flow Controller ID: 4469 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Acetone 5.5 8.0 4/13/23 17:03 TPHJ13 4194.8 Benzene ND 0.20 4/13/23 17:03 TPHND40.640.15 Benzyl chloride ND 0.20 4/13/23 17:03 TPHND41.00.18 Bromodichloromethane ND 0.20 4/13/23 17:03 TPHND41.30.14 Bromoform ND 0.20 4/13/23 17:03 TPHND42.10.14 Bromomethane ND 0.20 4/13/23 17:03 TPHND40.780.13 1,3-Butadiene ND 0.20 4/13/23 17:03 TPHND40.440.17 2-Butanone (MEK)ND 8.0 4/13/23 17:03 TPHND4242.1 Carbon Disulfide ND 2.0 4/13/23 17:03 TPHND46.20.18 Carbon Tetrachloride ND 0.20 4/13/23 17:03 TPHND41.30.16 Chlorobenzene ND 0.20 4/13/23 17:03 TPHND40.920.13 Chloroethane ND 0.20 4/13/23 17:03 TPHND40.530.18 Chloroform ND 0.20 4/13/23 17:03 TPHND40.980.19 Chloromethane ND 0.40 4/13/23 17:03 TPHND40.830.16 Cyclohexane 0.29 0.20 4/13/23 17:03 TPH1.0 40.690.12 Dibromochloromethane ND 0.20 4/13/23 17:03 TPHND41.70.13 1,2-Dibromoethane (EDB)ND 0.20 4/13/23 17:03 TPHND41.50.12 1,2-Dichlorobenzene ND 0.20 4/13/23 17:03 TPHND41.20.11 1,3-Dichlorobenzene ND 0.20 4/13/23 17:03 TPHND41.20.11 1,4-Dichlorobenzene ND 0.20 4/13/23 17:03 TPHND41.20.13 Dichlorodifluoromethane (Freon 12)0.31 0.20 4/13/23 17:03 TPH1.5 40.990.20 1,1-Dichloroethane ND 0.20 4/13/23 17:03 TPHND40.810.17 1,2-Dichloroethane ND 0.20 4/13/23 17:03 TPHND40.810.18 1,1-Dichloroethylene ND 0.20 4/13/23 17:03 TPHND40.790.15 cis-1,2-Dichloroethylene ND 0.20 4/13/23 17:03 TPHND40.790.15 trans-1,2-Dichloroethylene ND 0.20 4/13/23 17:03 TPHND40.790.16 1,2-Dichloropropane ND 0.20 4/13/23 17:03 TPHND40.920.11 cis-1,3-Dichloropropene ND 0.20 4/13/23 17:03 TPHND40.910.10 trans-1,3-Dichloropropene ND 0.20 4/13/23 17:03 TPHND40.910.10 1,2-Dichloro-1,1,2,2-tetrafluoroethane (Freon 114)ND 0.20 4/13/23 17:03 TPHND41.40.20 1,4-Dioxane ND 2.0 4/13/23 17:03 TPHND47.20.17 Ethanol 8.9 8.0 4/13/23 17:03 TPHV-05, L-03 17 4153.5 Ethyl Acetate ND 2.0 4/13/23 17:03 TPHND47.21.0 Ethylbenzene 0.17 0.20 4/13/23 17:03 TPHJ0.73 40.870.12 4-Ethyltoluene ND 0.20 4/13/23 17:03 TPHND40.980.12 Heptane ND 0.20 4/13/23 17:03 TPHND40.820.13 Hexachlorobutadiene ND 0.20 4/13/23 17:03 TPHL-03 ND 42.10.16 Page 4 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-2539 Sample ID: 23D0743-01 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -29 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -5.6 Sampled: 3/29/2023 10:27 Canister ID: 2119 Flow Controller ID: 4469 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Hexane ND 8.0 4/13/23 17:03 TPHND4281.0 2-Hexanone (MBK)0.14 0.20 4/13/23 17:03 TPHJ0.56 40.820.10 Isopropanol ND 8.0 4/13/23 17:03 TPHL-03 ND 4201.4 Methyl tert-Butyl Ether (MTBE)ND 0.20 4/13/23 17:03 TPHND40.720.15 Methylene Chloride ND 2.0 4/13/23 17:03 TPHND46.90.93 4-Methyl-2-pentanone (MIBK)ND 0.20 4/13/23 17:03 TPHND40.820.11 Naphthalene ND 0.20 4/13/23 17:03 TPHL-03 ND 41.00.15 Propene ND 8.0 4/13/23 17:03 TPHND4141.8 Styrene ND 0.20 4/13/23 17:03 TPHND40.850.11 1,1,2,2-Tetrachloroethane ND 0.20 4/13/23 17:03 TPHND41.40.11 Tetrachloroethylene 0.88 0.20 4/13/23 17:03 TPH6.0 41.40.15 Tetrahydrofuran ND 2.0 4/13/23 17:03 TPHND45.90.33 Toluene 0.81 0.20 4/13/23 17:03 TPH3.1 40.750.11 1,2,4-Trichlorobenzene ND 0.20 4/13/23 17:03 TPHL-03 ND 41.50.19 1,1,1-Trichloroethane ND 0.20 4/13/23 17:03 TPHND41.10.16 1,1,2-Trichloroethane ND 0.20 4/13/23 17:03 TPHND41.10.14 Trichloroethylene ND 0.20 4/13/23 17:03 TPHND41.10.13 Trichlorofluoromethane (Freon 11)ND 0.80 4/13/23 17:03 TPHND44.50.24 1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113)ND 0.80 4/13/23 17:03 TPHND46.10.22 1,2,4-Trimethylbenzene 0.21 0.20 4/13/23 17:03 TPH1.0 40.980.088 1,3,5-Trimethylbenzene ND 0.20 4/13/23 17:03 TPHND40.980.11 Vinyl Acetate ND 4.0 4/13/23 17:03 TPHND4141.1 Vinyl Chloride ND 0.20 4/13/23 17:03 TPHND40.510.18 m&p-Xylene 0.60 0.40 4/13/23 17:03 TPH2.6 41.70.22 o-Xylene 0.24 0.20 4/13/23 17:03 TPH1.1 40.870.10 Surrogates % Recovery % REC Limits 4-Bromofluorobenzene (1)96.9 4/13/23 17:0370-130 Page 5 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-2605 Sample ID: 23D0743-02 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -27 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -4.8 Sampled: 3/29/2023 13:06 Canister ID: 2106 Flow Controller ID: 4717 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Acetone 7.8 8.0 4/13/23 17:43 TPHJ18 4194.8 Benzene 0.42 0.20 4/13/23 17:43 TPH1.3 40.640.15 Benzyl chloride ND 0.20 4/13/23 17:43 TPHND41.00.18 Bromodichloromethane ND 0.20 4/13/23 17:43 TPHND41.30.14 Bromoform ND 0.20 4/13/23 17:43 TPHND42.10.14 Bromomethane ND 0.20 4/13/23 17:43 TPHND40.780.13 1,3-Butadiene ND 0.20 4/13/23 17:43 TPHND40.440.17 2-Butanone (MEK)ND 8.0 4/13/23 17:43 TPHND4242.1 Carbon Disulfide ND 2.0 4/13/23 17:43 TPHND46.20.18 Carbon Tetrachloride ND 0.20 4/13/23 17:43 TPHND41.30.16 Chlorobenzene ND 0.20 4/13/23 17:43 TPHND40.920.13 Chloroethane 0.35 0.20 4/13/23 17:43 TPH0.93 40.530.18 Chloroform 0.85 0.20 4/13/23 17:43 TPH4.2 40.980.19 Chloromethane 0.78 0.40 4/13/23 17:43 TPH1.6 40.830.16 Cyclohexane ND 0.20 4/13/23 17:43 TPHND40.690.12 Dibromochloromethane ND 0.20 4/13/23 17:43 TPHND41.70.13 1,2-Dibromoethane (EDB)ND 0.20 4/13/23 17:43 TPHND41.50.12 1,2-Dichlorobenzene ND 0.20 4/13/23 17:43 TPHND41.20.11 1,3-Dichlorobenzene ND 0.20 4/13/23 17:43 TPHND41.20.11 1,4-Dichlorobenzene ND 0.20 4/13/23 17:43 TPHND41.20.13 Dichlorodifluoromethane (Freon 12)0.33 0.20 4/13/23 17:43 TPH1.6 40.990.20 1,1-Dichloroethane ND 0.20 4/13/23 17:43 TPHND40.810.17 1,2-Dichloroethane ND 0.20 4/13/23 17:43 TPHND40.810.18 1,1-Dichloroethylene ND 0.20 4/13/23 17:43 TPHND40.790.15 cis-1,2-Dichloroethylene ND 0.20 4/13/23 17:43 TPHND40.790.15 trans-1,2-Dichloroethylene ND 0.20 4/13/23 17:43 TPHND40.790.16 1,2-Dichloropropane ND 0.20 4/13/23 17:43 TPHND40.920.11 cis-1,3-Dichloropropene ND 0.20 4/13/23 17:43 TPHND40.910.10 trans-1,3-Dichloropropene ND 0.20 4/13/23 17:43 TPHND40.910.10 1,2-Dichloro-1,1,2,2-tetrafluoroethane (Freon 114)ND 0.20 4/13/23 17:43 TPHND41.40.20 1,4-Dioxane 0.66 2.0 4/13/23 17:43 TPHJ2.4 47.20.17 Ethanol 7.4 8.0 4/13/23 17:43 TPHL-03, V-05, J 14 4153.5 Ethyl Acetate ND 2.0 4/13/23 17:43 TPHND47.21.0 Ethylbenzene 0.36 0.20 4/13/23 17:43 TPH1.6 40.870.12 4-Ethyltoluene 0.15 0.20 4/13/23 17:43 TPHJ0.73 40.980.12 Heptane 0.14 0.20 4/13/23 17:43 TPHJ0.59 40.820.13 Hexachlorobutadiene ND 0.20 4/13/23 17:43 TPHL-03 ND 42.10.16 Page 6 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-2605 Sample ID: 23D0743-02 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -27 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -4.8 Sampled: 3/29/2023 13:06 Canister ID: 2106 Flow Controller ID: 4717 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Hexane ND 8.0 4/13/23 17:43 TPHND4281.0 2-Hexanone (MBK)0.10 0.20 4/13/23 17:43 TPHJ0.43 40.820.10 Isopropanol ND 8.0 4/13/23 17:43 TPHL-03 ND 4201.4 Methyl tert-Butyl Ether (MTBE)ND 0.20 4/13/23 17:43 TPHND40.720.15 Methylene Chloride ND 2.0 4/13/23 17:43 TPHND46.90.93 4-Methyl-2-pentanone (MIBK)0.16 0.20 4/13/23 17:43 TPHJ0.66 40.820.11 Naphthalene ND 0.20 4/13/23 17:43 TPHL-03 ND 41.00.15 Propene ND 8.0 4/13/23 17:43 TPHND4141.8 Styrene 0.12 0.20 4/13/23 17:43 TPHJ0.53 40.850.11 1,1,2,2-Tetrachloroethane ND 0.20 4/13/23 17:43 TPHND41.40.11 Tetrachloroethylene ND 0.20 4/13/23 17:43 TPHND41.40.15 Tetrahydrofuran ND 2.0 4/13/23 17:43 TPHND45.90.33 Toluene 2.1 0.20 4/13/23 17:43 TPH7.9 40.750.11 1,2,4-Trichlorobenzene ND 0.20 4/13/23 17:43 TPHL-03 ND 41.50.19 1,1,1-Trichloroethane ND 0.20 4/13/23 17:43 TPHND41.10.16 1,1,2-Trichloroethane ND 0.20 4/13/23 17:43 TPHND41.10.14 Trichloroethylene ND 0.20 4/13/23 17:43 TPHND41.10.13 Trichlorofluoromethane (Freon 11)ND 0.80 4/13/23 17:43 TPHND44.50.24 1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113)ND 0.80 4/13/23 17:43 TPHND46.10.22 1,2,4-Trimethylbenzene 0.49 0.20 4/13/23 17:43 TPH2.4 40.980.088 1,3,5-Trimethylbenzene 0.12 0.20 4/13/23 17:43 TPHJ0.59 40.980.11 Vinyl Acetate ND 4.0 4/13/23 17:43 TPHND4141.1 Vinyl Chloride ND 0.20 4/13/23 17:43 TPHND40.510.18 m&p-Xylene 1.3 0.40 4/13/23 17:43 TPH5.7 41.70.22 o-Xylene 0.50 0.20 4/13/23 17:43 TPH2.2 40.870.10 Surrogates % Recovery % REC Limits 4-Bromofluorobenzene (1)98.1 4/13/23 17:4370-130 Page 7 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-2601 Sample ID: 23D0743-03 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -28 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -4.9 Sampled: 3/29/2023 14:36 Canister ID: 2913 Flow Controller ID: 4543 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Acetone ND 8.0 4/13/23 18:24 TPHND4194.8 Benzene 0.62 0.20 4/13/23 18:24 TPH2.0 40.640.15 Benzyl chloride ND 0.20 4/13/23 18:24 TPHND41.00.18 Bromodichloromethane ND 0.20 4/13/23 18:24 TPHND41.30.14 Bromoform ND 0.20 4/13/23 18:24 TPHND42.10.14 Bromomethane ND 0.20 4/13/23 18:24 TPHND40.780.13 1,3-Butadiene ND 0.20 4/13/23 18:24 TPHND40.440.17 2-Butanone (MEK)ND 8.0 4/13/23 18:24 TPHND4242.1 Carbon Disulfide ND 2.0 4/13/23 18:24 TPHND46.20.18 Carbon Tetrachloride ND 0.20 4/13/23 18:24 TPHND41.30.16 Chlorobenzene ND 0.20 4/13/23 18:24 TPHND40.920.13 Chloroethane ND 0.20 4/13/23 18:24 TPHND40.530.18 Chloroform 0.44 0.20 4/13/23 18:24 TPH2.1 40.980.19 Chloromethane ND 0.40 4/13/23 18:24 TPHND40.830.16 Cyclohexane 0.32 0.20 4/13/23 18:24 TPH1.1 40.690.12 Dibromochloromethane ND 0.20 4/13/23 18:24 TPHND41.70.13 1,2-Dibromoethane (EDB)ND 0.20 4/13/23 18:24 TPHND41.50.12 1,2-Dichlorobenzene ND 0.20 4/13/23 18:24 TPHND41.20.11 1,3-Dichlorobenzene ND 0.20 4/13/23 18:24 TPHND41.20.11 1,4-Dichlorobenzene ND 0.20 4/13/23 18:24 TPHND41.20.13 Dichlorodifluoromethane (Freon 12)0.29 0.20 4/13/23 18:24 TPH1.4 40.990.20 1,1-Dichloroethane ND 0.20 4/13/23 18:24 TPHND40.810.17 1,2-Dichloroethane ND 0.20 4/13/23 18:24 TPHND40.810.18 1,1-Dichloroethylene ND 0.20 4/13/23 18:24 TPHND40.790.15 cis-1,2-Dichloroethylene ND 0.20 4/13/23 18:24 TPHND40.790.15 trans-1,2-Dichloroethylene ND 0.20 4/13/23 18:24 TPHND40.790.16 1,2-Dichloropropane ND 0.20 4/13/23 18:24 TPHND40.920.11 cis-1,3-Dichloropropene ND 0.20 4/13/23 18:24 TPHND40.910.10 trans-1,3-Dichloropropene ND 0.20 4/13/23 18:24 TPHND40.910.10 1,2-Dichloro-1,1,2,2-tetrafluoroethane (Freon 114)ND 0.20 4/13/23 18:24 TPHND41.40.20 1,4-Dioxane ND 2.0 4/13/23 18:24 TPHND47.20.17 Ethanol 9.8 8.0 4/13/23 18:24 TPHL-03, V-05 18 4153.5 Ethyl Acetate ND 2.0 4/13/23 18:24 TPHND47.21.0 Ethylbenzene 0.44 0.20 4/13/23 18:24 TPH1.9 40.870.12 4-Ethyltoluene 0.14 0.20 4/13/23 18:24 TPHJ0.71 40.980.12 Heptane 0.14 0.20 4/13/23 18:24 TPHJ0.56 40.820.13 Hexachlorobutadiene ND 0.20 4/13/23 18:24 TPHL-03 ND 42.10.16 Page 8 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-2601 Sample ID: 23D0743-03 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -28 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -4.9 Sampled: 3/29/2023 14:36 Canister ID: 2913 Flow Controller ID: 4543 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Hexane ND 8.0 4/13/23 18:24 TPHND4281.0 2-Hexanone (MBK)ND 0.20 4/13/23 18:24 TPHND40.820.10 Isopropanol ND 8.0 4/13/23 18:24 TPHL-03 ND 4201.4 Methyl tert-Butyl Ether (MTBE)ND 0.20 4/13/23 18:24 TPHND40.720.15 Methylene Chloride ND 2.0 4/13/23 18:24 TPHND46.90.93 4-Methyl-2-pentanone (MIBK)0.12 0.20 4/13/23 18:24 TPHJ0.48 40.820.11 Naphthalene ND 0.20 4/13/23 18:24 TPHL-03 ND 41.00.15 Propene ND 8.0 4/13/23 18:24 TPHND4141.8 Styrene ND 0.20 4/13/23 18:24 TPHND40.850.11 1,1,2,2-Tetrachloroethane ND 0.20 4/13/23 18:24 TPHND41.40.11 Tetrachloroethylene ND 0.20 4/13/23 18:24 TPHND41.40.15 Tetrahydrofuran ND 2.0 4/13/23 18:24 TPHND45.90.33 Toluene 2.6 0.20 4/13/23 18:24 TPH9.9 40.750.11 1,2,4-Trichlorobenzene ND 0.20 4/13/23 18:24 TPHL-03 ND 41.50.19 1,1,1-Trichloroethane ND 0.20 4/13/23 18:24 TPHND41.10.16 1,1,2-Trichloroethane ND 0.20 4/13/23 18:24 TPHND41.10.14 Trichloroethylene ND 0.20 4/13/23 18:24 TPHND41.10.13 Trichlorofluoromethane (Freon 11)ND 0.80 4/13/23 18:24 TPHND44.50.24 1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113)ND 0.80 4/13/23 18:24 TPHND46.10.22 1,2,4-Trimethylbenzene 0.35 0.20 4/13/23 18:24 TPH1.7 40.980.088 1,3,5-Trimethylbenzene ND 0.20 4/13/23 18:24 TPHND40.980.11 Vinyl Acetate ND 4.0 4/13/23 18:24 TPHND4141.1 Vinyl Chloride ND 0.20 4/13/23 18:24 TPHND40.510.18 m&p-Xylene 1.3 0.40 4/13/23 18:24 TPH5.7 41.70.22 o-Xylene 0.53 0.20 4/13/23 18:24 TPH2.3 40.870.10 Surrogates % Recovery % REC Limits 4-Bromofluorobenzene (1)96.4 4/13/23 18:2470-130 Page 9 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-2535 Sample ID: 23D0743-04 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -28 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -4.6 Sampled: 3/29/2023 10:01 Canister ID: 2232 Flow Controller ID: 4549 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Acetone ND 8.0 4/13/23 19:04 TPHND4194.8 Benzene ND 0.20 4/13/23 19:04 TPHND40.640.15 Benzyl chloride ND 0.20 4/13/23 19:04 TPHND41.00.18 Bromodichloromethane 1.0 0.20 4/13/23 19:04 TPH6.9 41.30.14 Bromoform ND 0.20 4/13/23 19:04 TPHND42.10.14 Bromomethane ND 0.20 4/13/23 19:04 TPHND40.780.13 1,3-Butadiene ND 0.20 4/13/23 19:04 TPHND40.440.17 2-Butanone (MEK)ND 8.0 4/13/23 19:04 TPHND4242.1 Carbon Disulfide ND 2.0 4/13/23 19:04 TPHND46.20.18 Carbon Tetrachloride ND 0.20 4/13/23 19:04 TPHND41.30.16 Chlorobenzene ND 0.20 4/13/23 19:04 TPHND40.920.13 Chloroethane ND 0.20 4/13/23 19:04 TPHND40.530.18 Chloroform 20 0.20 4/13/23 19:04 TPH96 40.980.19 Chloromethane ND 0.40 4/13/23 19:04 TPHND40.830.16 Cyclohexane 0.30 0.20 4/13/23 19:04 TPH1.0 40.690.12 Dibromochloromethane ND 0.20 4/13/23 19:04 TPHND41.70.13 1,2-Dibromoethane (EDB)ND 0.20 4/13/23 19:04 TPHND41.50.12 1,2-Dichlorobenzene ND 0.20 4/13/23 19:04 TPHND41.20.11 1,3-Dichlorobenzene ND 0.20 4/13/23 19:04 TPHND41.20.11 1,4-Dichlorobenzene ND 0.20 4/13/23 19:04 TPHND41.20.13 Dichlorodifluoromethane (Freon 12)0.32 0.20 4/13/23 19:04 TPH1.6 40.990.20 1,1-Dichloroethane ND 0.20 4/13/23 19:04 TPHND40.810.17 1,2-Dichloroethane ND 0.20 4/13/23 19:04 TPHND40.810.18 1,1-Dichloroethylene ND 0.20 4/13/23 19:04 TPHND40.790.15 cis-1,2-Dichloroethylene ND 0.20 4/13/23 19:04 TPHND40.790.15 trans-1,2-Dichloroethylene ND 0.20 4/13/23 19:04 TPHND40.790.16 1,2-Dichloropropane ND 0.20 4/13/23 19:04 TPHND40.920.11 cis-1,3-Dichloropropene ND 0.20 4/13/23 19:04 TPHND40.910.10 trans-1,3-Dichloropropene ND 0.20 4/13/23 19:04 TPHND40.910.10 1,2-Dichloro-1,1,2,2-tetrafluoroethane (Freon 114)ND 0.20 4/13/23 19:04 TPHND41.40.20 1,4-Dioxane ND 2.0 4/13/23 19:04 TPHND47.20.17 Ethanol 20 8.0 4/13/23 19:04 TPHL-03, V-05 37 4153.5 Ethyl Acetate ND 2.0 4/13/23 19:04 TPHND47.21.0 Ethylbenzene ND 0.20 4/13/23 19:04 TPHND40.870.12 4-Ethyltoluene ND 0.20 4/13/23 19:04 TPHND40.980.12 Heptane ND 0.20 4/13/23 19:04 TPHND40.820.13 Hexachlorobutadiene ND 0.20 4/13/23 19:04 TPHL-03 ND 42.10.16 Page 10 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-2535 Sample ID: 23D0743-04 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -28 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -4.6 Sampled: 3/29/2023 10:01 Canister ID: 2232 Flow Controller ID: 4549 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Hexane ND 8.0 4/13/23 19:04 TPHND4281.0 2-Hexanone (MBK)ND 0.20 4/13/23 19:04 TPHND40.820.10 Isopropanol ND 8.0 4/13/23 19:04 TPHL-03 ND 4201.4 Methyl tert-Butyl Ether (MTBE)ND 0.20 4/13/23 19:04 TPHND40.720.15 Methylene Chloride ND 2.0 4/13/23 19:04 TPHND46.90.93 4-Methyl-2-pentanone (MIBK)ND 0.20 4/13/23 19:04 TPHND40.820.11 Naphthalene ND 0.20 4/13/23 19:04 TPHL-03 ND 41.00.15 Propene ND 8.0 4/13/23 19:04 TPHND4141.8 Styrene ND 0.20 4/13/23 19:04 TPHND40.850.11 1,1,2,2-Tetrachloroethane ND 0.20 4/13/23 19:04 TPHND41.40.11 Tetrachloroethylene ND 0.20 4/13/23 19:04 TPHND41.40.15 Tetrahydrofuran ND 2.0 4/13/23 19:04 TPHND45.90.33 Toluene 0.12 0.20 4/13/23 19:04 TPHJ0.45 40.750.11 1,2,4-Trichlorobenzene ND 0.20 4/13/23 19:04 TPHL-03 ND 41.50.19 1,1,1-Trichloroethane ND 0.20 4/13/23 19:04 TPHND41.10.16 1,1,2-Trichloroethane ND 0.20 4/13/23 19:04 TPHND41.10.14 Trichloroethylene ND 0.20 4/13/23 19:04 TPHND41.10.13 Trichlorofluoromethane (Freon 11)ND 0.80 4/13/23 19:04 TPHND44.50.24 1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113)ND 0.80 4/13/23 19:04 TPHND46.10.22 1,2,4-Trimethylbenzene ND 0.20 4/13/23 19:04 TPHND40.980.088 1,3,5-Trimethylbenzene ND 0.20 4/13/23 19:04 TPHND40.980.11 Vinyl Acetate ND 4.0 4/13/23 19:04 TPHND4141.1 Vinyl Chloride ND 0.20 4/13/23 19:04 TPHND40.510.18 m&p-Xylene ND 0.40 4/13/23 19:04 TPHND41.70.22 o-Xylene ND 0.20 4/13/23 19:04 TPHND40.870.10 Surrogates % Recovery % REC Limits 4-Bromofluorobenzene (1)96.8 4/13/23 19:0470-130 Page 11 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-2613 Sample ID: 23D0743-05 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -27 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -4.8 Sampled: 3/29/2023 11:00 Canister ID: 2100 Flow Controller ID: 4752 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Acetone 6.2 8.0 4/13/23 19:44 TPHJ15 4194.8 Benzene 0.16 0.20 4/13/23 19:44 TPHJ0.52 40.640.15 Benzyl chloride ND 0.20 4/13/23 19:44 TPHND41.00.18 Bromodichloromethane ND 0.20 4/13/23 19:44 TPHND41.30.14 Bromoform ND 0.20 4/13/23 19:44 TPHND42.10.14 Bromomethane ND 0.20 4/13/23 19:44 TPHND40.780.13 1,3-Butadiene ND 0.20 4/13/23 19:44 TPHND40.440.17 2-Butanone (MEK)ND 8.0 4/13/23 19:44 TPHND4242.1 Carbon Disulfide ND 2.0 4/13/23 19:44 TPHND46.20.18 Carbon Tetrachloride ND 0.20 4/13/23 19:44 TPHND41.30.16 Chlorobenzene ND 0.20 4/13/23 19:44 TPHND40.920.13 Chloroethane ND 0.20 4/13/23 19:44 TPHND40.530.18 Chloroform ND 0.20 4/13/23 19:44 TPHND40.980.19 Chloromethane 0.80 0.40 4/13/23 19:44 TPH1.7 40.830.16 Cyclohexane 0.28 0.20 4/13/23 19:44 TPH0.96 40.690.12 Dibromochloromethane ND 0.20 4/13/23 19:44 TPHND41.70.13 1,2-Dibromoethane (EDB)ND 0.20 4/13/23 19:44 TPHND41.50.12 1,2-Dichlorobenzene ND 0.20 4/13/23 19:44 TPHND41.20.11 1,3-Dichlorobenzene ND 0.20 4/13/23 19:44 TPHND41.20.11 1,4-Dichlorobenzene ND 0.20 4/13/23 19:44 TPHND41.20.13 Dichlorodifluoromethane (Freon 12)0.30 0.20 4/13/23 19:44 TPH1.5 40.990.20 1,1-Dichloroethane ND 0.20 4/13/23 19:44 TPHND40.810.17 1,2-Dichloroethane ND 0.20 4/13/23 19:44 TPHND40.810.18 1,1-Dichloroethylene ND 0.20 4/13/23 19:44 TPHND40.790.15 cis-1,2-Dichloroethylene ND 0.20 4/13/23 19:44 TPHND40.790.15 trans-1,2-Dichloroethylene ND 0.20 4/13/23 19:44 TPHND40.790.16 1,2-Dichloropropane ND 0.20 4/13/23 19:44 TPHND40.920.11 cis-1,3-Dichloropropene ND 0.20 4/13/23 19:44 TPHND40.910.10 trans-1,3-Dichloropropene ND 0.20 4/13/23 19:44 TPHND40.910.10 1,2-Dichloro-1,1,2,2-tetrafluoroethane (Freon 114)ND 0.20 4/13/23 19:44 TPHND41.40.20 1,4-Dioxane ND 2.0 4/13/23 19:44 TPHND47.20.17 Ethanol 15 8.0 4/13/23 19:44 TPHL-03, V-05 29 4153.5 Ethyl Acetate ND 2.0 4/13/23 19:44 TPHND47.21.0 Ethylbenzene 0.13 0.20 4/13/23 19:44 TPHJ0.56 40.870.12 4-Ethyltoluene ND 0.20 4/13/23 19:44 TPHND40.980.12 Heptane ND 0.20 4/13/23 19:44 TPHND40.820.13 Hexachlorobutadiene ND 0.20 4/13/23 19:44 TPHL-03 ND 42.10.16 Page 12 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-2613 Sample ID: 23D0743-05 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -27 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -4.8 Sampled: 3/29/2023 11:00 Canister ID: 2100 Flow Controller ID: 4752 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Hexane ND 8.0 4/13/23 19:44 TPHND4281.0 2-Hexanone (MBK)ND 0.20 4/13/23 19:44 TPHND40.820.10 Isopropanol ND 8.0 4/13/23 19:44 TPHL-03 ND 4201.4 Methyl tert-Butyl Ether (MTBE)ND 0.20 4/13/23 19:44 TPHND40.720.15 Methylene Chloride ND 2.0 4/13/23 19:44 TPHND46.90.93 4-Methyl-2-pentanone (MIBK)ND 0.20 4/13/23 19:44 TPHND40.820.11 Naphthalene ND 0.20 4/13/23 19:44 TPHL-03 ND 41.00.15 Propene ND 8.0 4/13/23 19:44 TPHND4141.8 Styrene ND 0.20 4/13/23 19:44 TPHND40.850.11 1,1,2,2-Tetrachloroethane ND 0.20 4/13/23 19:44 TPHND41.40.11 Tetrachloroethylene ND 0.20 4/13/23 19:44 TPHND41.40.15 Tetrahydrofuran ND 2.0 4/13/23 19:44 TPHND45.90.33 Toluene 0.65 0.20 4/13/23 19:44 TPH2.4 40.750.11 1,2,4-Trichlorobenzene ND 0.20 4/13/23 19:44 TPHL-03 ND 41.50.19 1,1,1-Trichloroethane ND 0.20 4/13/23 19:44 TPHND41.10.16 1,1,2-Trichloroethane ND 0.20 4/13/23 19:44 TPHND41.10.14 Trichloroethylene ND 0.20 4/13/23 19:44 TPHND41.10.13 Trichlorofluoromethane (Freon 11)ND 0.80 4/13/23 19:44 TPHND44.50.24 1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113)ND 0.80 4/13/23 19:44 TPHND46.10.22 1,2,4-Trimethylbenzene 0.58 0.20 4/13/23 19:44 TPH2.9 40.980.088 1,3,5-Trimethylbenzene ND 0.20 4/13/23 19:44 TPHND40.980.11 Vinyl Acetate ND 4.0 4/13/23 19:44 TPHND4141.1 Vinyl Chloride ND 0.20 4/13/23 19:44 TPHND40.510.18 m&p-Xylene 0.51 0.40 4/13/23 19:44 TPH2.2 41.70.22 o-Xylene 0.20 0.20 4/13/23 19:44 TPH0.89 40.870.10 Surrogates % Recovery % REC Limits 4-Bromofluorobenzene (1)96.5 4/13/23 19:4470-130 Page 13 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-2531 Sample ID: 23D0743-06 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -29 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -4.1 Sampled: 3/29/2023 09:36 Canister ID: 2247 Flow Controller ID: 4751 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Acetone 6.2 8.0 4/13/23 21:05 TPHJ15 4194.8 Benzene ND 0.20 4/13/23 21:05 TPHND40.640.15 Benzyl chloride ND 0.20 4/13/23 21:05 TPHND41.00.18 Bromodichloromethane ND 0.20 4/13/23 21:05 TPHND41.30.14 Bromoform ND 0.20 4/13/23 21:05 TPHND42.10.14 Bromomethane ND 0.20 4/13/23 21:05 TPHND40.780.13 1,3-Butadiene ND 0.20 4/13/23 21:05 TPHND40.440.17 2-Butanone (MEK)ND 8.0 4/13/23 21:05 TPHND4242.1 Carbon Disulfide ND 2.0 4/13/23 21:05 TPHND46.20.18 Carbon Tetrachloride ND 0.20 4/13/23 21:05 TPHND41.30.16 Chlorobenzene ND 0.20 4/13/23 21:05 TPHND40.920.13 Chloroethane ND 0.20 4/13/23 21:05 TPHND40.530.18 Chloroform 28 0.20 4/13/23 21:05 TPH140 40.980.19 Chloromethane 0.18 0.40 4/13/23 21:05 TPHJ0.37 40.830.16 Cyclohexane 0.36 0.20 4/13/23 21:05 TPH1.3 40.690.12 Dibromochloromethane ND 0.20 4/13/23 21:05 TPHND41.70.13 1,2-Dibromoethane (EDB)ND 0.20 4/13/23 21:05 TPHND41.50.12 1,2-Dichlorobenzene ND 0.20 4/13/23 21:05 TPHND41.20.11 1,3-Dichlorobenzene ND 0.20 4/13/23 21:05 TPHND41.20.11 1,4-Dichlorobenzene ND 0.20 4/13/23 21:05 TPHND41.20.13 Dichlorodifluoromethane (Freon 12)0.48 0.20 4/13/23 21:05 TPH2.4 40.990.20 1,1-Dichloroethane ND 0.20 4/13/23 21:05 TPHND40.810.17 1,2-Dichloroethane ND 0.20 4/13/23 21:05 TPHND40.810.18 1,1-Dichloroethylene ND 0.20 4/13/23 21:05 TPHND40.790.15 cis-1,2-Dichloroethylene ND 0.20 4/13/23 21:05 TPHND40.790.15 trans-1,2-Dichloroethylene ND 0.20 4/13/23 21:05 TPHND40.790.16 1,2-Dichloropropane ND 0.20 4/13/23 21:05 TPHND40.920.11 cis-1,3-Dichloropropene ND 0.20 4/13/23 21:05 TPHND40.910.10 trans-1,3-Dichloropropene ND 0.20 4/13/23 21:05 TPHND40.910.10 1,2-Dichloro-1,1,2,2-tetrafluoroethane (Freon 114)ND 0.20 4/13/23 21:05 TPHND41.40.20 1,4-Dioxane ND 2.0 4/13/23 21:05 TPHND47.20.17 Ethanol 10 8.0 4/13/23 21:05 TPHL-03, V-05 20 4153.5 Ethyl Acetate ND 2.0 4/13/23 21:05 TPHND47.21.0 Ethylbenzene ND 0.20 4/13/23 21:05 TPHND40.870.12 4-Ethyltoluene ND 0.20 4/13/23 21:05 TPHND40.980.12 Heptane 0.13 0.20 4/13/23 21:05 TPHJ0.54 40.820.13 Hexachlorobutadiene ND 0.20 4/13/23 21:05 TPHL-03 ND 42.10.16 Page 14 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-2531 Sample ID: 23D0743-06 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -29 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -4.1 Sampled: 3/29/2023 09:36 Canister ID: 2247 Flow Controller ID: 4751 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Hexane ND 8.0 4/13/23 21:05 TPHND4281.0 2-Hexanone (MBK)ND 0.20 4/13/23 21:05 TPHND40.820.10 Isopropanol ND 8.0 4/13/23 21:05 TPHL-03 ND 4201.4 Methyl tert-Butyl Ether (MTBE)ND 0.20 4/13/23 21:05 TPHND40.720.15 Methylene Chloride ND 2.0 4/13/23 21:05 TPHND46.90.93 4-Methyl-2-pentanone (MIBK)ND 0.20 4/13/23 21:05 TPHND40.820.11 Naphthalene ND 0.20 4/13/23 21:05 TPHL-03 ND 41.00.15 Propene ND 8.0 4/13/23 21:05 TPHND4141.8 Styrene ND 0.20 4/13/23 21:05 TPHND40.850.11 1,1,2,2-Tetrachloroethane ND 0.20 4/13/23 21:05 TPHND41.40.11 Tetrachloroethylene ND 0.20 4/13/23 21:05 TPHND41.40.15 Tetrahydrofuran ND 2.0 4/13/23 21:05 TPHND45.90.33 Toluene 0.38 0.20 4/13/23 21:05 TPH1.4 40.750.11 1,2,4-Trichlorobenzene ND 0.20 4/13/23 21:05 TPHL-03 ND 41.50.19 1,1,1-Trichloroethane ND 0.20 4/13/23 21:05 TPHND41.10.16 1,1,2-Trichloroethane ND 0.20 4/13/23 21:05 TPHND41.10.14 Trichloroethylene ND 0.20 4/13/23 21:05 TPHND41.10.13 Trichlorofluoromethane (Freon 11)ND 0.80 4/13/23 21:05 TPHND44.50.24 1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113)ND 0.80 4/13/23 21:05 TPHND46.10.22 1,2,4-Trimethylbenzene 0.25 0.20 4/13/23 21:05 TPH1.2 40.980.088 1,3,5-Trimethylbenzene ND 0.20 4/13/23 21:05 TPHND40.980.11 Vinyl Acetate ND 4.0 4/13/23 21:05 TPHND4141.1 Vinyl Chloride ND 0.20 4/13/23 21:05 TPHND40.510.18 m&p-Xylene 0.32 0.40 4/13/23 21:05 TPHJ1.4 41.70.22 o-Xylene 0.14 0.20 4/13/23 21:05 TPHJ0.63 40.870.10 Surrogates % Recovery % REC Limits 4-Bromofluorobenzene (1)97.4 4/13/23 21:0570-130 Page 15 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-2609 Sample ID: 23D0743-07 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -27 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -4.5 Sampled: 3/29/2023 10:25 Canister ID: 2127 Flow Controller ID: 4470 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Acetone 7.1 8.0 4/13/23 21:46 TPHJ17 4194.8 Benzene 0.17 0.20 4/13/23 21:46 TPHJ0.55 40.640.15 Benzyl chloride ND 0.20 4/13/23 21:46 TPHND41.00.18 Bromodichloromethane ND 0.20 4/13/23 21:46 TPHND41.30.14 Bromoform ND 0.20 4/13/23 21:46 TPHND42.10.14 Bromomethane ND 0.20 4/13/23 21:46 TPHND40.780.13 1,3-Butadiene ND 0.20 4/13/23 21:46 TPHND40.440.17 2-Butanone (MEK)ND 8.0 4/13/23 21:46 TPHND4242.1 Carbon Disulfide ND 2.0 4/13/23 21:46 TPHND46.20.18 Carbon Tetrachloride ND 0.20 4/13/23 21:46 TPHND41.30.16 Chlorobenzene ND 0.20 4/13/23 21:46 TPHND40.920.13 Chloroethane ND 0.20 4/13/23 21:46 TPHND40.530.18 Chloroform ND 0.20 4/13/23 21:46 TPHND40.980.19 Chloromethane ND 0.40 4/13/23 21:46 TPHND40.830.16 Cyclohexane ND 0.20 4/13/23 21:46 TPHND40.690.12 Dibromochloromethane ND 0.20 4/13/23 21:46 TPHND41.70.13 1,2-Dibromoethane (EDB)ND 0.20 4/13/23 21:46 TPHND41.50.12 1,2-Dichlorobenzene ND 0.20 4/13/23 21:46 TPHND41.20.11 1,3-Dichlorobenzene ND 0.20 4/13/23 21:46 TPHND41.20.11 1,4-Dichlorobenzene ND 0.20 4/13/23 21:46 TPHND41.20.13 Dichlorodifluoromethane (Freon 12)0.32 0.20 4/13/23 21:46 TPH1.6 40.990.20 1,1-Dichloroethane ND 0.20 4/13/23 21:46 TPHND40.810.17 1,2-Dichloroethane ND 0.20 4/13/23 21:46 TPHND40.810.18 1,1-Dichloroethylene ND 0.20 4/13/23 21:46 TPHND40.790.15 cis-1,2-Dichloroethylene ND 0.20 4/13/23 21:46 TPHND40.790.15 trans-1,2-Dichloroethylene ND 0.20 4/13/23 21:46 TPHND40.790.16 1,2-Dichloropropane ND 0.20 4/13/23 21:46 TPHND40.920.11 cis-1,3-Dichloropropene ND 0.20 4/13/23 21:46 TPHND40.910.10 trans-1,3-Dichloropropene ND 0.20 4/13/23 21:46 TPHND40.910.10 1,2-Dichloro-1,1,2,2-tetrafluoroethane (Freon 114)ND 0.20 4/13/23 21:46 TPHND41.40.20 1,4-Dioxane ND 2.0 4/13/23 21:46 TPHND47.20.17 Ethanol 8.5 8.0 4/13/23 21:46 TPHL-03, V-05 16 4153.5 Ethyl Acetate ND 2.0 4/13/23 21:46 TPHND47.21.0 Ethylbenzene ND 0.20 4/13/23 21:46 TPHND40.870.12 4-Ethyltoluene ND 0.20 4/13/23 21:46 TPHND40.980.12 Heptane 0.14 0.20 4/13/23 21:46 TPHJ0.57 40.820.13 Hexachlorobutadiene ND 0.20 4/13/23 21:46 TPHL-03 ND 42.10.16 Page 16 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-2609 Sample ID: 23D0743-07 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -27 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -4.5 Sampled: 3/29/2023 10:25 Canister ID: 2127 Flow Controller ID: 4470 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Hexane ND 8.0 4/13/23 21:46 TPHND4281.0 2-Hexanone (MBK)ND 0.20 4/13/23 21:46 TPHND40.820.10 Isopropanol ND 8.0 4/13/23 21:46 TPHL-03 ND 4201.4 Methyl tert-Butyl Ether (MTBE)ND 0.20 4/13/23 21:46 TPHND40.720.15 Methylene Chloride ND 2.0 4/13/23 21:46 TPHND46.90.93 4-Methyl-2-pentanone (MIBK)ND 0.20 4/13/23 21:46 TPHND40.820.11 Naphthalene ND 0.20 4/13/23 21:46 TPHL-03 ND 41.00.15 Propene ND 8.0 4/13/23 21:46 TPHND4141.8 Styrene ND 0.20 4/13/23 21:46 TPHND40.850.11 1,1,2,2-Tetrachloroethane ND 0.20 4/13/23 21:46 TPHND41.40.11 Tetrachloroethylene ND 0.20 4/13/23 21:46 TPHND41.40.15 Tetrahydrofuran 0.43 2.0 4/13/23 21:46 TPHJ1.3 45.90.33 Toluene 0.52 0.20 4/13/23 21:46 TPH2.0 40.750.11 1,2,4-Trichlorobenzene ND 0.20 4/13/23 21:46 TPHL-03 ND 41.50.19 1,1,1-Trichloroethane ND 0.20 4/13/23 21:46 TPHND41.10.16 1,1,2-Trichloroethane ND 0.20 4/13/23 21:46 TPHND41.10.14 Trichloroethylene ND 0.20 4/13/23 21:46 TPHND41.10.13 Trichlorofluoromethane (Freon 11)ND 0.80 4/13/23 21:46 TPHND44.50.24 1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113)ND 0.80 4/13/23 21:46 TPHND46.10.22 1,2,4-Trimethylbenzene 0.37 0.20 4/13/23 21:46 TPH1.8 40.980.088 1,3,5-Trimethylbenzene ND 0.20 4/13/23 21:46 TPHND40.980.11 Vinyl Acetate ND 4.0 4/13/23 21:46 TPHND4141.1 Vinyl Chloride ND 0.20 4/13/23 21:46 TPHND40.510.18 m&p-Xylene 0.43 0.40 4/13/23 21:46 TPH1.9 41.70.22 o-Xylene 0.19 0.20 4/13/23 21:46 TPHJ0.83 40.870.10 Surrogates % Recovery % REC Limits 4-Bromofluorobenzene (1)97.4 4/13/23 21:4670-130 Page 17 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-2617 Sample ID: 23D0743-08 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -27 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -4.2 Sampled: 3/29/2023 11:30 Canister ID: 2674 Flow Controller ID: 4338 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Acetone ND 8.0 4/13/23 22:26 TPHND4194.8 Benzene ND 0.20 4/13/23 22:26 TPHND40.640.15 Benzyl chloride ND 0.20 4/13/23 22:26 TPHND41.00.18 Bromodichloromethane ND 0.20 4/13/23 22:26 TPHND41.30.14 Bromoform ND 0.20 4/13/23 22:26 TPHND42.10.14 Bromomethane ND 0.20 4/13/23 22:26 TPHND40.780.13 1,3-Butadiene ND 0.20 4/13/23 22:26 TPHND40.440.17 2-Butanone (MEK)ND 8.0 4/13/23 22:26 TPHND4242.1 Carbon Disulfide 0.20 2.0 4/13/23 22:26 TPHJ0.62 46.20.18 Carbon Tetrachloride ND 0.20 4/13/23 22:26 TPHND41.30.16 Chlorobenzene ND 0.20 4/13/23 22:26 TPHND40.920.13 Chloroethane ND 0.20 4/13/23 22:26 TPHND40.530.18 Chloroform ND 0.20 4/13/23 22:26 TPHND40.980.19 Chloromethane 0.16 0.40 4/13/23 22:26 TPHJ0.33 40.830.16 Cyclohexane ND 0.20 4/13/23 22:26 TPHND40.690.12 Dibromochloromethane ND 0.20 4/13/23 22:26 TPHND41.70.13 1,2-Dibromoethane (EDB)ND 0.20 4/13/23 22:26 TPHND41.50.12 1,2-Dichlorobenzene ND 0.20 4/13/23 22:26 TPHND41.20.11 1,3-Dichlorobenzene ND 0.20 4/13/23 22:26 TPHND41.20.11 1,4-Dichlorobenzene ND 0.20 4/13/23 22:26 TPHND41.20.13 Dichlorodifluoromethane (Freon 12)0.35 0.20 4/13/23 22:26 TPH1.7 40.990.20 1,1-Dichloroethane ND 0.20 4/13/23 22:26 TPHND40.810.17 1,2-Dichloroethane ND 0.20 4/13/23 22:26 TPHND40.810.18 1,1-Dichloroethylene ND 0.20 4/13/23 22:26 TPHND40.790.15 cis-1,2-Dichloroethylene ND 0.20 4/13/23 22:26 TPHND40.790.15 trans-1,2-Dichloroethylene ND 0.20 4/13/23 22:26 TPHND40.790.16 1,2-Dichloropropane ND 0.20 4/13/23 22:26 TPHND40.920.11 cis-1,3-Dichloropropene ND 0.20 4/13/23 22:26 TPHND40.910.10 trans-1,3-Dichloropropene ND 0.20 4/13/23 22:26 TPHND40.910.10 1,2-Dichloro-1,1,2,2-tetrafluoroethane (Freon 114)ND 0.20 4/13/23 22:26 TPHND41.40.20 1,4-Dioxane ND 2.0 4/13/23 22:26 TPHND47.20.17 Ethanol 21 8.0 4/13/23 22:26 TPHL-03, V-05 39 4153.5 Ethyl Acetate ND 2.0 4/13/23 22:26 TPHND47.21.0 Ethylbenzene ND 0.20 4/13/23 22:26 TPHND40.870.12 4-Ethyltoluene ND 0.20 4/13/23 22:26 TPHND40.980.12 Heptane ND 0.20 4/13/23 22:26 TPHND40.820.13 Hexachlorobutadiene ND 0.20 4/13/23 22:26 TPHL-03 ND 42.10.16 Page 18 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-2617 Sample ID: 23D0743-08 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -27 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -4.2 Sampled: 3/29/2023 11:30 Canister ID: 2674 Flow Controller ID: 4338 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Hexane ND 8.0 4/13/23 22:26 TPHND4281.0 2-Hexanone (MBK)ND 0.20 4/13/23 22:26 TPHND40.820.10 Isopropanol ND 8.0 4/13/23 22:26 TPHL-03 ND 4201.4 Methyl tert-Butyl Ether (MTBE)ND 0.20 4/13/23 22:26 TPHND40.720.15 Methylene Chloride ND 2.0 4/13/23 22:26 TPHND46.90.93 4-Methyl-2-pentanone (MIBK)ND 0.20 4/13/23 22:26 TPHND40.820.11 Naphthalene ND 0.20 4/13/23 22:26 TPHL-03 ND 41.00.15 Propene ND 8.0 4/13/23 22:26 TPHND4141.8 Styrene ND 0.20 4/13/23 22:26 TPHND40.850.11 1,1,2,2-Tetrachloroethane ND 0.20 4/13/23 22:26 TPHND41.40.11 Tetrachloroethylene ND 0.20 4/13/23 22:26 TPHND41.40.15 Tetrahydrofuran ND 2.0 4/13/23 22:26 TPHND45.90.33 Toluene 0.23 0.20 4/13/23 22:26 TPH0.86 40.750.11 1,2,4-Trichlorobenzene ND 0.20 4/13/23 22:26 TPHL-03 ND 41.50.19 1,1,1-Trichloroethane ND 0.20 4/13/23 22:26 TPHND41.10.16 1,1,2-Trichloroethane ND 0.20 4/13/23 22:26 TPHND41.10.14 Trichloroethylene ND 0.20 4/13/23 22:26 TPHND41.10.13 Trichlorofluoromethane (Freon 11)ND 0.80 4/13/23 22:26 TPHND44.50.24 1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113)ND 0.80 4/13/23 22:26 TPHND46.10.22 1,2,4-Trimethylbenzene ND 0.20 4/13/23 22:26 TPHND40.980.088 1,3,5-Trimethylbenzene ND 0.20 4/13/23 22:26 TPHND40.980.11 Vinyl Acetate ND 4.0 4/13/23 22:26 TPHND4141.1 Vinyl Chloride ND 0.20 4/13/23 22:26 TPHND40.510.18 m&p-Xylene ND 0.40 4/13/23 22:26 TPHND41.70.22 o-Xylene ND 0.20 4/13/23 22:26 TPHND40.870.10 Surrogates % Recovery % REC Limits 4-Bromofluorobenzene (1)96.2 4/13/23 22:2670-130 Page 19 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-DUP Sample ID: 23D0743-09 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -27 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -4.9 Sampled: 3/29/2023 13:06 Canister ID: 2333 Flow Controller ID: 4717 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Acetone ND 8.0 4/13/23 23:07 TPHND4194.8 Benzene 0.41 0.20 4/13/23 23:07 TPH1.3 40.640.15 Benzyl chloride ND 0.20 4/13/23 23:07 TPHND41.00.18 Bromodichloromethane ND 0.20 4/13/23 23:07 TPHND41.30.14 Bromoform ND 0.20 4/13/23 23:07 TPHND42.10.14 Bromomethane ND 0.20 4/13/23 23:07 TPHND40.780.13 1,3-Butadiene ND 0.20 4/13/23 23:07 TPHND40.440.17 2-Butanone (MEK)ND 8.0 4/13/23 23:07 TPHND4242.1 Carbon Disulfide ND 2.0 4/13/23 23:07 TPHND46.20.18 Carbon Tetrachloride ND 0.20 4/13/23 23:07 TPHND41.30.16 Chlorobenzene ND 0.20 4/13/23 23:07 TPHND40.920.13 Chloroethane ND 0.20 4/13/23 23:07 TPHND40.530.18 Chloroform 0.82 0.20 4/13/23 23:07 TPH4.0 40.980.19 Chloromethane 0.16 0.40 4/13/23 23:07 TPHJ0.33 40.830.16 Cyclohexane 0.28 0.20 4/13/23 23:07 TPH0.98 40.690.12 Dibromochloromethane ND 0.20 4/13/23 23:07 TPHND41.70.13 1,2-Dibromoethane (EDB)ND 0.20 4/13/23 23:07 TPHND41.50.12 1,2-Dichlorobenzene ND 0.20 4/13/23 23:07 TPHND41.20.11 1,3-Dichlorobenzene ND 0.20 4/13/23 23:07 TPHND41.20.11 1,4-Dichlorobenzene ND 0.20 4/13/23 23:07 TPHND41.20.13 Dichlorodifluoromethane (Freon 12)0.28 0.20 4/13/23 23:07 TPH1.4 40.990.20 1,1-Dichloroethane ND 0.20 4/13/23 23:07 TPHND40.810.17 1,2-Dichloroethane ND 0.20 4/13/23 23:07 TPHND40.810.18 1,1-Dichloroethylene ND 0.20 4/13/23 23:07 TPHND40.790.15 cis-1,2-Dichloroethylene ND 0.20 4/13/23 23:07 TPHND40.790.15 trans-1,2-Dichloroethylene ND 0.20 4/13/23 23:07 TPHND40.790.16 1,2-Dichloropropane ND 0.20 4/13/23 23:07 TPHND40.920.11 cis-1,3-Dichloropropene ND 0.20 4/13/23 23:07 TPHND40.910.10 trans-1,3-Dichloropropene ND 0.20 4/13/23 23:07 TPHND40.910.10 1,2-Dichloro-1,1,2,2-tetrafluoroethane (Freon 114)ND 0.20 4/13/23 23:07 TPHND41.40.20 1,4-Dioxane ND 2.0 4/13/23 23:07 TPHND47.20.17 Ethanol 8.3 8.0 4/13/23 23:07 TPHL-03, V-05 16 4153.5 Ethyl Acetate ND 2.0 4/13/23 23:07 TPHND47.21.0 Ethylbenzene 0.35 0.20 4/13/23 23:07 TPH1.5 40.870.12 4-Ethyltoluene 0.14 0.20 4/13/23 23:07 TPHJ0.69 40.980.12 Heptane ND 0.20 4/13/23 23:07 TPHND40.820.13 Hexachlorobutadiene ND 0.20 4/13/23 23:07 TPHL-03 ND 42.10.16 Page 20 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ANALYTICAL RESULTS Project Location: Charlotte, NC Date Received: 4/5/2023 Work Order: 23D0743Sample Description/Location: Field Sample #: SS-DUP Sample ID: 23D0743-09 Sample Matrix: Sub Slab Initial Vacuum(in Hg): -27 Final Vacuum(in Hg): -5 Receipt Vacuum(in Hg): -4.9 Sampled: 3/29/2023 13:06 Canister ID: 2333 Flow Controller ID: 4717 Sub Description/Location: Canister Size: 1 liter Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: Sample Type: 10 min RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte Date/Time EPA TO-15 ppbv ug/m3 MDL Hexane ND 8.0 4/13/23 23:07 TPHND4281.0 2-Hexanone (MBK)0.15 0.20 4/13/23 23:07 TPHJ0.62 40.820.10 Isopropanol ND 8.0 4/13/23 23:07 TPHL-03 ND 4201.4 Methyl tert-Butyl Ether (MTBE)ND 0.20 4/13/23 23:07 TPHND40.720.15 Methylene Chloride ND 2.0 4/13/23 23:07 TPHND46.90.93 4-Methyl-2-pentanone (MIBK)ND 0.20 4/13/23 23:07 TPHND40.820.11 Naphthalene ND 0.20 4/13/23 23:07 TPHL-03 ND 41.00.15 Propene ND 8.0 4/13/23 23:07 TPHND4141.8 Styrene 0.12 0.20 4/13/23 23:07 TPHJ0.51 40.850.11 1,1,2,2-Tetrachloroethane ND 0.20 4/13/23 23:07 TPHND41.40.11 Tetrachloroethylene ND 0.20 4/13/23 23:07 TPHND41.40.15 Tetrahydrofuran ND 2.0 4/13/23 23:07 TPHND45.90.33 Toluene 2.1 0.20 4/13/23 23:07 TPH7.8 40.750.11 1,2,4-Trichlorobenzene ND 0.20 4/13/23 23:07 TPHL-03 ND 41.50.19 1,1,1-Trichloroethane ND 0.20 4/13/23 23:07 TPHND41.10.16 1,1,2-Trichloroethane ND 0.20 4/13/23 23:07 TPHND41.10.14 Trichloroethylene ND 0.20 4/13/23 23:07 TPHND41.10.13 Trichlorofluoromethane (Freon 11)ND 0.80 4/13/23 23:07 TPHND44.50.24 1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113)ND 0.80 4/13/23 23:07 TPHND46.10.22 1,2,4-Trimethylbenzene 0.63 0.20 4/13/23 23:07 TPH3.1 40.980.088 1,3,5-Trimethylbenzene 0.11 0.20 4/13/23 23:07 TPHJ0.53 40.980.11 Vinyl Acetate ND 4.0 4/13/23 23:07 TPHND4141.1 Vinyl Chloride ND 0.20 4/13/23 23:07 TPHND40.510.18 m&p-Xylene 1.3 0.40 4/13/23 23:07 TPH5.6 41.70.22 o-Xylene 0.46 0.20 4/13/23 23:07 TPH2.0 40.870.10 Surrogates % Recovery % REC Limits 4-Bromofluorobenzene (1)96.8 4/13/23 23:0770-130 Page 21 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 Sample Extraction Data Prep Method: TO-15 Prep-EPA TO-15 Lab Number [Field ID]Batch Date Pressure Dilution Pre Dilution Pre-Dil Initial mL Pre-Dil Final mL Default Injection mL Actual Injection mL 23D0743-01 [SS-2539]B337295 1.5 1 N/A 1000 400 150 04/13/23 23D0743-02 [SS-2605]B337295 1.5 1 N/A 1000 400 150 04/13/23 23D0743-03 [SS-2601]B337295 1.5 1 N/A 1000 400 150 04/13/23 23D0743-04 [SS-2535]B337295 1.5 1 N/A 1000 400 150 04/13/23 23D0743-05 [SS-2613]B337295 1.5 1 N/A 1000 400 150 04/13/23 23D0743-06 [SS-2531]B337295 1.5 1 N/A 1000 400 150 04/13/23 23D0743-07 [SS-2609]B337295 1.5 1 N/A 1000 400 150 04/13/23 23D0743-08 [SS-2617]B337295 1.5 1 N/A 1000 400 150 04/13/23 23D0743-09 [SS-DUP]B337295 1.5 1 N/A 1000 400 150 04/13/23 Page 22 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ug/m3 Spike Level Result Source %REC %REC Limits RPD RPD Limit Flag/Qual Analyte Air Toxics by EPA Compendium Methods - Quality Control QUALITY CONTROL RL ppbv Results RL Results ppbv Batch B337295 - TO-15 Prep Blank (B337295-BLK1)Prepared & Analyzed: 04/13/23 1.4NDAcetone 0.035NDBenzene 0.035NDBenzyl chloride 0.035NDBromodichloromethane 0.035NDBromoform 0.035NDBromomethane 0.035ND1,3-Butadiene 1.4ND2-Butanone (MEK) 0.35NDCarbon Disulfide 0.035NDCarbon Tetrachloride 0.035NDChlorobenzene 0.035NDChloroethane 0.035NDChloroform 0.070NDChloromethane 0.035NDCyclohexane 0.035NDDibromochloromethane 0.035ND1,2-Dibromoethane (EDB) 0.035ND1,2-Dichlorobenzene 0.035ND1,3-Dichlorobenzene 0.035ND1,4-Dichlorobenzene 0.035NDDichlorodifluoromethane (Freon 12) 0.035ND1,1-Dichloroethane 0.035ND1,2-Dichloroethane 0.035ND1,1-Dichloroethylene 0.035NDcis-1,2-Dichloroethylene 0.035NDtrans-1,2-Dichloroethylene 0.035ND1,2-Dichloropropane 0.035NDcis-1,3-Dichloropropene 0.035NDtrans-1,3-Dichloropropene 0.035ND1,2-Dichloro-1,1,2,2-tetrafluoroethane (Freon 114) 0.35ND1,4-Dioxane 1.4 L-03, V-05NDEthanol 0.35NDEthyl Acetate 0.035NDEthylbenzene 0.035ND4-Ethyltoluene 0.035NDHeptane 0.035 L-03NDHexachlorobutadiene 1.4NDHexane 0.035ND2-Hexanone (MBK) 1.4 L-03NDIsopropanol 0.035NDMethyl tert-Butyl Ether (MTBE) 0.35NDMethylene Chloride 0.035ND4-Methyl-2-pentanone (MIBK) 0.035 L-03NDNaphthalene 1.4NDPropene 0.035NDStyrene Page 23 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ug/m3 Spike Level Result Source %REC %REC Limits RPD RPD Limit Flag/Qual Analyte Air Toxics by EPA Compendium Methods - Quality Control QUALITY CONTROL RL ppbv Results RL Results ppbv Batch B337295 - TO-15 Prep Blank (B337295-BLK1)Prepared & Analyzed: 04/13/23 0.035ND1,1,2,2-Tetrachloroethane 0.035NDTetrachloroethylene 0.35NDTetrahydrofuran 0.035NDToluene 0.035 L-03ND1,2,4-Trichlorobenzene 0.035ND1,1,1-Trichloroethane 0.035ND1,1,2-Trichloroethane 0.035NDTrichloroethylene 0.14NDTrichlorofluoromethane (Freon 11) 0.14ND1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113) 0.035ND1,2,4-Trimethylbenzene 0.035ND1,3,5-Trimethylbenzene 0.70NDVinyl Acetate 0.035NDVinyl Chloride 0.070NDm&p-Xylene 0.035NDo-Xylene 8.00 70-130Surrogate: 4-Bromofluorobenzene (1)96.67.72 LCS (B337295-BS1)Prepared & Analyzed: 04/13/23 5.00 70-13078.63.93Acetone 5.00 70-13096.54.82Benzene 5.00 70-13093.94.69Benzyl chloride 5.00 70-13093.44.67Bromodichloromethane 5.00 70-13083.94.19Bromoform 5.00 70-13073.23.66Bromomethane 5.00 70-13072.23.611,3-Butadiene 5.00 70-13094.04.702-Butanone (MEK) 5.00 70-13087.44.37Carbon Disulfide 5.00 70-13092.24.61Carbon Tetrachloride 5.00 70-13083.44.17Chlorobenzene 5.00 70-13076.93.84Chloroethane 5.00 70-13085.74.28Chloroform 5.00 70-13075.03.75Chloromethane 5.00 70-13097.44.87Cyclohexane 5.00 70-13089.14.45Dibromochloromethane 5.00 70-13086.54.321,2-Dibromoethane (EDB) 5.00 70-13081.14.061,2-Dichlorobenzene 5.00 70-13082.04.101,3-Dichlorobenzene 5.00 70-13082.54.121,4-Dichlorobenzene 5.00 70-13083.04.15Dichlorodifluoromethane (Freon 12) 5.00 70-13090.24.511,1-Dichloroethane 5.00 70-13088.34.421,2-Dichloroethane 5.00 70-13090.34.521,1-Dichloroethylene 5.00 70-13091.34.56cis-1,2-Dichloroethylene 5.00 70-13091.14.56trans-1,2-Dichloroethylene 5.00 70-1301015.071,2-Dichloropropane Page 24 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ug/m3 Spike Level Result Source %REC %REC Limits RPD RPD Limit Flag/Qual Analyte Air Toxics by EPA Compendium Methods - Quality Control QUALITY CONTROL RL ppbv Results RL Results ppbv Batch B337295 - TO-15 Prep LCS (B337295-BS1)Prepared & Analyzed: 04/13/23 5.00 70-13098.44.92cis-1,3-Dichloropropene 5.00 70-13099.64.98trans-1,3-Dichloropropene 5.00 70-13071.73.591,2-Dichloro-1,1,2,2-tetrafluoroethane (Freon 114) 5.00 70-13095.44.771,4-Dioxane 5.00 L-03, V-0570-13058.62.93Ethanol * 5.00 70-13091.54.57Ethyl Acetate 5.00 70-13091.94.60Ethylbenzene 5.00 70-13094.64.734-Ethyltoluene 5.00 70-1301025.11Heptane 5.00 L-0370-13059.42.97Hexachlorobutadiene * 5.00 70-13099.34.97Hexane 5.00 70-1301015.062-Hexanone (MBK) 5.00 L-0370-13063.73.18Isopropanol * 5.00 70-13090.64.53Methyl tert-Butyl Ether (MTBE) 5.00 70-13077.43.87Methylene Chloride 5.00 70-1301055.234-Methyl-2-pentanone (MIBK) 5.00 L-0370-13064.43.22Naphthalene * 5.00 70-13091.74.59Propene 5.00 70-13093.74.68Styrene 5.00 70-13086.94.341,1,2,2-Tetrachloroethane 5.00 70-13082.24.11Tetrachloroethylene 5.00 70-13096.04.80Tetrahydrofuran 5.00 70-13091.74.58Toluene 5.00 L-0370-13057.82.891,2,4-Trichlorobenzene * 5.00 70-13087.14.361,1,1-Trichloroethane 5.00 70-13087.94.401,1,2-Trichloroethane 5.00 70-13093.14.66Trichloroethylene 5.00 70-13072.83.64Trichlorofluoromethane (Freon 11) 5.00 70-13080.44.021,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113) 5.00 70-13092.24.611,2,4-Trimethylbenzene 5.00 70-13091.34.571,3,5-Trimethylbenzene 5.00 70-13082.74.13Vinyl Acetate 5.00 70-13078.73.94Vinyl Chloride 10.0 70-13093.59.35m&p-Xylene 5.00 70-13094.94.74o-Xylene 8.00 70-130Surrogate: 4-Bromofluorobenzene (1)98.87.90 Page 25 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ug/m3 Spike Level Result Source %REC %REC Limits RPD RPD Limit Flag/Qual Analyte Air Toxics by EPA Compendium Methods - Quality Control QUALITY CONTROL RL ppbv Results RL Results ppbv Batch B337295 - TO-15 Prep Duplicate (B337295-DUP1)Prepared & Analyzed: 04/13/23 Source: 23D0743-05 8.0 6.2 25 J1.176.1Acetone 1915 0.20 0.16 25 J4.760.17Benzene 0.640.55 0.20 ND 25NDBenzyl chloride 1.0ND 0.20 ND 25NDBromodichloromethane1.3ND 0.20 ND 25NDBromoform2.1ND 0.20 ND 25NDBromomethane0.78ND 0.20 ND 25ND1,3-Butadiene 0.44ND 8.0 ND 25ND2-Butanone (MEK)24ND 2.0 ND 25NDCarbon Disulfide 6.2ND 0.20 ND 25NDCarbon Tetrachloride 1.3ND 0.20 ND 25NDChlorobenzene0.92ND 0.20 ND 25NDChloroethane0.53ND 0.20 ND 25NDChloroform0.98ND 0.40 0.80 259.420.73Chloromethane 0.831.5 0.20 0.28 259.520.31Cyclohexane 0.691.1 0.20 ND 25NDDibromochloromethane1.7ND 0.20 ND 25ND1,2-Dibromoethane (EDB)1.5ND 0.20 ND 25ND1,2-Dichlorobenzene 1.2ND 0.20 ND 25ND1,3-Dichlorobenzene 1.2ND 0.20 ND 25ND1,4-Dichlorobenzene 1.2ND 0.20 0.30 2512.60.27Dichlorodifluoromethane (Freon 12)0.991.3 0.20 ND 25ND1,1-Dichloroethane 0.81ND 0.20 ND 25ND1,2-Dichloroethane 0.81ND 0.20 ND 25ND1,1-Dichloroethylene 0.79ND 0.20 ND 25NDcis-1,2-Dichloroethylene 0.79ND 0.20 ND 25NDtrans-1,2-Dichloroethylene 0.79ND 0.20 ND 25ND1,2-Dichloropropane 0.92ND 0.20 ND 25NDcis-1,3-Dichloropropene 0.91ND 0.20 ND 25NDtrans-1,3-Dichloropropene 0.91ND 0.20 ND 25ND1,2-Dichloro-1,1,2,2-tetrafluoroethane (Freon 114) 1.4ND 2.0 ND 25ND1,4-Dioxane 7.2ND 8.0 15 25 L-03, V-052.7215Ethanol1528 2.0 ND 25NDEthyl Acetate 7.2ND 0.20 0.13 25 J6.060.14Ethylbenzene 0.870.59 0.20 ND 25ND4-Ethyltoluene 0.98ND 0.20 ND 25NDHeptane0.82ND 0.20 ND 25 L-03NDHexachlorobutadiene2.1ND 8.0 ND 25NDHexane28ND 0.20 ND 25ND2-Hexanone (MBK)0.82ND 8.0 ND 25 L-03NDIsopropanol20ND 0.20 ND 25NDMethyl tert-Butyl Ether (MTBE)0.72ND 2.0 ND 25NDMethylene Chloride 6.9ND 0.20 ND 25ND4-Methyl-2-pentanone (MIBK)0.82ND 0.20 ND 25 L-03NDNaphthalene1.0ND 8.0 ND 25NDPropene14ND 0.20 ND 25NDStyrene0.85ND Page 26 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 ug/m3 Spike Level Result Source %REC %REC Limits RPD RPD Limit Flag/Qual Analyte Air Toxics by EPA Compendium Methods - Quality Control QUALITY CONTROL RL ppbv Results RL Results ppbv Batch B337295 - TO-15 Prep Duplicate (B337295-DUP1)Prepared & Analyzed: 04/13/23 Source: 23D0743-05 0.20 ND 25ND1,1,2,2-Tetrachloroethane 1.4ND 0.20 ND 25NDTetrachloroethylene1.4ND 2.0 ND 25NDTetrahydrofuran5.9ND 0.20 0.65 251.830.66Toluene 0.752.5 0.20 ND 25 L-03ND1,2,4-Trichlorobenzene 1.5ND 0.20 ND 25ND1,1,1-Trichloroethane 1.1ND 0.20 ND 25ND1,1,2-Trichloroethane 1.1ND 0.20 ND 25NDTrichloroethylene1.1ND 0.80 ND 25NDTrichlorofluoromethane (Freon 11)4.5ND 0.80 ND 25ND1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113) 6.1ND 0.20 0.58 250.6870.581,2,4-Trimethylbenzene 0.982.9 0.20 ND 25ND1,3,5-Trimethylbenzene 0.98ND 4.0 ND 25NDVinyl Acetate 14ND 0.20 ND 25NDVinyl Chloride 0.51ND 0.40 0.51 253.200.49m&p-Xylene 1.72.1 0.20 0.20 251.940.21o-Xylene 0.870.90 8.00 70-130Surrogate: 4-Bromofluorobenzene (1)89.07.12 Page 27 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 Note: Blank Subtraction is not performed unless otherwise noted *QC result is outside of established limits. Wide recovery limits established for difficult compound. Wide RPD limits established for difficult compound. #Data exceeded client recommended or regulatory level RL Reporting Limit MDL Method Detection Limit RPD Relative Percent Difference LCS Laboratory Control Sample Laboratory Control SampleLCS Dup Duplicate Laboratory Control Sample MS Matrix Spike Sample MS Dup Duplicate Matrix Spike Sample REC Recovery QC Quality Control ppbv Parts per billion volume EPA United States Environmental Protection Agency Percent Recovery% REC ND Not Detected Percent recoveries and relative percent differences (RPDs) are determined by the software using values in the calculation which have not been rounded. Not ApplicableN/A DL Detection Limit Not CalculatedNC LFB/LCS Lab Fortified Blank/Lab Control Sample ORP Oxidation-Reduction Potential Not dry weight correctedwet Percent weight% wt KilogramKg Gramg Milligrammg Microgramg Nanogramng LiterL MillilitermL Microliter L Cubic Meterm3 Extractable Petroleum HydrocarbonsEPH Volatile Petroleum HydrocarbonsVPH Air Petroleum HydrocarbonsAPH Flame Ionization DetectorFID Photo Ionization DetectorPID FLAG/QUALIFIER SUMMARY Detected but below the Reporting Limit (lowest calibration standard); therefore, result is an estimated concentration (CLP J-Flag). J Laboratory fortified blank/laboratory control sample recovery is outside of control limits. Reported value for this compound is likely to be biased on the low side. L-03 Continuing calibration verification (CCV) did not meet method specifications and was biased on the low side for this compound. V-05 ANALYST Thomas P. HniteckiTPH Rebecca FaustRLF Kristen M CoutureKMC Christian M. HenriquezCMH Brittany R. FiskBRF Page 28 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 INTERNAL STANDARD AREA AND RT SUMMARY EPA TO-15 RTResponseInternal Standard Area %RT DiffResponse Reference RT Reference Area % Limits RT Diff Limit Q Initial Cal Check (S076501-ICV1 )Lab File ID: G22A256016.D Analyzed: 09/13/22 22:00 Bromochloromethane (1)1141026 8.307 1141026 8.307 60 - 140100 0.0000 +/-0.50 1,4-Difluorobenzene (1)2751702 10.081 2751702 10.081 60 - 140100 0.0000 +/-0.50 Chlorobenzene-d5 (1)2471195 14.446 2471195 14.446 60 - 140100 0.0000 +/-0.50 INTERNAL STANDARD AREA AND RT SUMMARY EPA TO-15 RTResponseInternal Standard Area %RT DiffResponse Reference RT Reference Area % Limits RT Diff Limit Q Calibration Check (S086005-CCV1 )Lab File ID: G23A103004.D Analyzed: 04/13/23 13:35 Bromochloromethane (1)1238778 8.301 1238778 8.301 60 - 140100 0.0000 +/-0.50 1,4-Difluorobenzene (1)2781298 10.069 2781298 10.069 60 - 140100 0.0000 +/-0.50 Chlorobenzene-d5 (1)2608648 14.434 2608648 14.434 60 - 140100 0.0000 +/-0.50 LCS (B337295-BS1 )Lab File ID: G23A103005.D Analyzed: 04/13/23 14:14 Bromochloromethane (1)1213632 8.301 1238778 8.301 60 - 14098 0.0000 +/-0.50 1,4-Difluorobenzene (1)2666622 10.069 2781298 10.069 60 - 14096 0.0000 +/-0.50 Chlorobenzene-d5 (1)2507975 14.434 2608648 14.434 60 - 14096 0.0000 +/-0.50 Blank (B337295-BLK1 )Lab File ID: G23A103008.D Analyzed: 04/13/23 16:23 Bromochloromethane (1)1106795 8.3 1238778 8.301 60 - 14089 -0.0010 +/-0.50 1,4-Difluorobenzene (1)2400912 10.068 2781298 10.069 60 - 14086 -0.0010 +/-0.50 Chlorobenzene-d5 (1)2257630 14.433 2608648 14.434 60 - 14087 -0.0010 +/-0.50 SS-2539 (23D0743-01 )Lab File ID: G23A103009.D Analyzed: 04/13/23 17:03 Bromochloromethane (1)1065448 8.301 1238778 8.301 60 - 14086 0.0000 +/-0.50 1,4-Difluorobenzene (1)2282024 10.075 2781298 10.069 60 - 14082 0.0060 +/-0.50 Chlorobenzene-d5 (1)2179985 14.433 2608648 14.434 60 - 14084 -0.0010 +/-0.50 SS-2605 (23D0743-02 )Lab File ID: G23A103010.D Analyzed: 04/13/23 17:43 Bromochloromethane (1)1055110 8.307 1238778 8.301 60 - 14085 0.0060 +/-0.50 1,4-Difluorobenzene (1)2272679 10.075 2781298 10.069 60 - 14082 0.0060 +/-0.50 Chlorobenzene-d5 (1)2155573 14.44 2608648 14.434 60 - 14083 0.0060 +/-0.50 SS-2601 (23D0743-03 )Lab File ID: G23A103011.D Analyzed: 04/13/23 18:24 Bromochloromethane (1)1059760 8.301 1238778 8.301 60 - 14086 0.0000 +/-0.50 1,4-Difluorobenzene (1)2269208 10.068 2781298 10.069 60 - 14082 -0.0010 +/-0.50 Chlorobenzene-d5 (1)2160666 14.433 2608648 14.434 60 - 14083 -0.0010 +/-0.50 SS-2535 (23D0743-04 )Lab File ID: G23A103012.D Analyzed: 04/13/23 19:04 Bromochloromethane (1)1041019 8.3 1238778 8.301 60 - 14084 -0.0010 +/-0.50 1,4-Difluorobenzene (1)2263496 10.068 2781298 10.069 60 - 14081 -0.0010 +/-0.50 Chlorobenzene-d5 (1)2137077 14.433 2608648 14.434 60 - 14082 -0.0010 +/-0.50 Page 29 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 INTERNAL STANDARD AREA AND RT SUMMARY EPA TO-15 RTResponseInternal Standard Area %RT DiffResponse Reference RT Reference Area % Limits RT Diff Limit Q SS-2613 (23D0743-05 )Lab File ID: G23A103013.D Analyzed: 04/13/23 19:44 Bromochloromethane (1)1029878 8.301 1238778 8.301 60 - 14083 0.0000 +/-0.50 1,4-Difluorobenzene (1)2221457 10.069 2781298 10.069 60 - 14080 0.0000 +/-0.50 Chlorobenzene-d5 (1)2116379 14.434 2608648 14.434 60 - 14081 0.0000 +/-0.50 Duplicate (B337295-DUP1 )Lab File ID: G23A103014.D Analyzed: 04/13/23 20:25 Bromochloromethane (1)1038380 8.301 1238778 8.301 60 - 14084 0.0000 +/-0.50 1,4-Difluorobenzene (1)2270378 10.069 2781298 10.069 60 - 14082 0.0000 +/-0.50 Chlorobenzene-d5 (1)2184376 14.434 2608648 14.434 60 - 14084 0.0000 +/-0.50 SS-2531 (23D0743-06 )Lab File ID: G23A103015.D Analyzed: 04/13/23 21:05 Bromochloromethane (1)1036636 8.301 1238778 8.301 60 - 14084 0.0000 +/-0.50 1,4-Difluorobenzene (1)2312566 10.069 2781298 10.069 60 - 14083 0.0000 +/-0.50 Chlorobenzene-d5 (1)2182022 14.434 2608648 14.434 60 - 14084 0.0000 +/-0.50 SS-2609 (23D0743-07 )Lab File ID: G23A103016.D Analyzed: 04/13/23 21:46 Bromochloromethane (1)1050905 8.294 1238778 8.301 60 - 14085 -0.0070 +/-0.50 1,4-Difluorobenzene (1)2286718 10.069 2781298 10.069 60 - 14082 0.0000 +/-0.50 Chlorobenzene-d5 (1)2171728 14.434 2608648 14.434 60 - 14083 0.0000 +/-0.50 SS-2617 (23D0743-08 )Lab File ID: G23A103017.D Analyzed: 04/13/23 22:26 Bromochloromethane (1)1041149 8.301 1238778 8.301 60 - 14084 0.0000 +/-0.50 1,4-Difluorobenzene (1)2259033 10.068 2781298 10.069 60 - 14081 -0.0010 +/-0.50 Chlorobenzene-d5 (1)2140887 14.433 2608648 14.434 60 - 14082 -0.0010 +/-0.50 SS-DUP (23D0743-09 )Lab File ID: G23A103018.D Analyzed: 04/13/23 23:07 Bromochloromethane (1)1037940 8.3 1238778 8.301 60 - 14084 -0.0010 +/-0.50 1,4-Difluorobenzene (1)2242677 10.068 2781298 10.069 60 - 14081 -0.0010 +/-0.50 Chlorobenzene-d5 (1)2153510 14.433 2608648 14.434 60 - 14083 -0.0010 +/-0.50 Page 30 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 CONTINUING CALIBRATION CHECK EPA TO-15 S086005-CCV1 COMPOUND TYPE CCV MIN (#)CCV LIMIT (#)CCV ICAL CONC. (ppbv)% DIFF / DRIFTRESPONSE FACTOR STD 0.8910252A -17.8 304.11 1.0840045.00Acetone 0.883504A -3.2 304.84 0.91292885.00Benzene 1.098409A 6.5 305.33 1.0309425.00Benzyl chloride 0.6597403A -5.1 304.74 0.69538115.00Bromodichloromethane 0.4860449A -14.1 304.30 0.56564685.00Bromoform 0.4569484A -24.0 303.80 0.60094595.00Bromomethane 0.4232003A -22.2 303.89 0.54430045.001,3-Butadiene 1.4289A -5.2 304.74 1.5076835.002-Butanone (MEK) 1.75138A -13.6 304.32 2.027485.00Carbon Disulfide 0.5067878A -7.5 304.62 0.54799985.00Carbon Tetrachloride 0.7599327A -13.7 304.31 0.88093295.00Chlorobenzene 0.2718563A -21.3 303.94 0.34529675.00Chloroethane 1.354548A -13.2 304.34 1.5611845.00Chloroform 0.5345875A -21.6 303.92 0.68218995.00Chloromethane 0.3496652A -2.9 304.86 0.36008455.00Cyclohexane 0.5808103A -9.2 304.54 0.63965815.00Dibromochloromethane 0.5557018A -10.0 304.50 0.61712075.001,2-Dibromoethane (EDB) 0.6290112A -9.3 304.53 0.69370945.001,2-Dichlorobenzene 0.6768116A -8.7 304.57 0.74095815.001,3-Dichlorobenzene 0.6662756A -7.7 304.62 0.72181555.001,4-Dichlorobenzene 1.257833A -22.7 303.86 1.628085.00Dichlorodifluoromethane (Freon 12) 1.220722A -9.1 304.55 1.3427425.001,1-Dichloroethane 0.8663196A -10.0 304.50 0.96275235.001,2-Dichloroethane 1.039236A -8.9 304.56 1.1401425.001,1-Dichloroethylene 0.9017002A -6.8 304.66 0.96709635.00cis-1,2-Dichloroethylene 0.9324014A -6.9 304.65 1.0018255.00trans-1,2-Dichloroethylene 0.360394A 1.0 305.05 0.35679895.001,2-Dichloropropane 0.5208722A 2.3 305.11 0.50928525.00cis-1,3-Dichloropropene 0.4588338A 0.4 305.02 0.45709815.00trans-1,3-Dichloropropene 1.377186A -20.9 303.96 1.739985.001,2-Dichloro-1,1,2,2-tetrafluoroethane (Freon 114) 0.1835523A -1.2 304.94 0.18576415.001,4-Dioxane 0.1571097A -33.0 *303.35 0.23432645.00Ethanol 0.2390846A 3.6 305.18 0.23081635.00Ethyl Acetate 1.39226A -4.3 304.78 1.4550245.00Ethylbenzene 1.424769A 0.8 305.04 1.4137715.004-Ethyltoluene 0.2923999A 2.6 305.13 0.28503085.00Heptane 0.3760765A -19.6 304.02 0.46774595.00Hexachlorobutadiene 0.8414473A -0.3 304.99 0.89853945.00Hexane Page 31 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 CONTINUING CALIBRATION CHECK EPA TO-15 S086005-CCV1 COMPOUND TYPE CCV MIN (#)CCV LIMIT (#)CCV ICAL CONC. (ppbv)% DIFF / DRIFTRESPONSE FACTOR STD 0.8023289A 4.0 305.20 0.77128645.002-Hexanone (MBK) 1.057959A -21.0 303.95 1.3389025.00Isopropanol 1.705611A -7.0 304.65 1.8347235.00Methyl tert-Butyl Ether (MTBE) 0.7488322A -22.0 303.90 0.95972155.00Methylene Chloride 0.8115031A 5.0 305.25 0.77268545.004-Methyl-2-pentanone (MIBK) 1.080413A -1.1 304.95 1.0922465.00Naphthalene 0.5723046A -3.7 304.82 0.59413285.00Propene 0.7785642A -1.3 304.93 0.78907525.00Styrene 0.9050665A -8.1 304.59 0.98512615.001,1,2,2-Tetrachloroethane 0.3901184A -14.7 304.27 0.4571945.00Tetrachloroethylene 0.2785493A -5.8 304.71 0.29570925.00Tetrahydrofuran 1.072805A -7.0 304.65 1.153995.00Toluene 0.4300453A -13.5 304.32 0.49736235.001,2,4-Trichlorobenzene 0.5491847A -8.1 304.60 0.59756985.001,1,1-Trichloroethane 0.3682582A -11.5 304.42 0.41627035.001,1,2-Trichloroethane 0.3705671A -6.1 304.69 0.39479585.00Trichloroethylene 1.107352A -24.3 303.78 1.4633275.00Trichlorofluoromethane (Freon 11) 1.176931A -17.8 304.11 1.4325475.001,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113) 1.170474A 1.3 305.06 1.1560195.001,2,4-Trimethylbenzene 1.175626A -1.2 304.94 1.1903885.001,3,5-Trimethylbenzene 1.586033A -20.2 303.99 1.9867395.00Vinyl Acetate 0.5769802A -19.2 304.04 0.71421155.00Vinyl Chloride 1.093806A -3.1 309.69 1.12906610.0m&p-Xylene 1.113808A -2.2 304.89 1.1389555.00o-Xylene * Values outside of QC limits # Column to be used to flag Response Factor and %Diff/Drift values with an asterisk Page 32 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 CertificationsAnalyte CERTIFICATIONS Certified Analyses included in this Report EPA TO-15 in Air AIHA,NY,ME,NHAcetone AIHA,FL,NJ,NY,ME,NH,VABenzene AIHA,FL,NJ,NY,ME,NH,VABenzyl chloride AIHA,NJ,NY,ME,NH,VABromodichloromethane AIHA,NJ,NY,ME,NH,VABromoform AIHA,FL,NJ,NY,ME,NHBromomethane AIHA,NJ,NY,ME,NH,VA1,3-Butadiene AIHA,FL,NJ,NY,ME,NH,VA2-Butanone (MEK) AIHA,NJ,NY,ME,NH,VACarbon Disulfide AIHA,FL,NJ,NY,ME,NH,VACarbon Tetrachloride AIHA,FL,NJ,NY,ME,NH,VAChlorobenzene AIHA,FL,NJ,NY,ME,NH,VAChloroethane AIHA,FL,NJ,NY,ME,NH,VAChloroform AIHA,FL,NJ,NY,ME,NH,VAChloromethane AIHA,NJ,NY,ME,NH,VACyclohexane AIHA,NY,ME,NHDibromochloromethane AIHA,NJ,NY,ME,NH1,2-Dibromoethane (EDB) AIHA,FL,NJ,NY,ME,NH,VA1,2-Dichlorobenzene AIHA,NJ,NY,ME,NH1,3-Dichlorobenzene AIHA,FL,NJ,NY,ME,NH,VA1,4-Dichlorobenzene AIHA,NY,ME,NHDichlorodifluoromethane (Freon 12) AIHA,FL,NJ,NY,ME,NH,VA1,1-Dichloroethane AIHA,FL,NJ,NY,ME,NH,VA1,2-Dichloroethane AIHA,FL,NJ,NY,ME,NH,VA1,1-Dichloroethylene AIHA,FL,NY,ME,NH,VAcis-1,2-Dichloroethylene AIHA,NJ,NY,ME,NH,VAtrans-1,2-Dichloroethylene AIHA,FL,NJ,NY,ME,NH,VA1,2-Dichloropropane AIHA,FL,NJ,NY,ME,NH,VAcis-1,3-Dichloropropene AIHA,NY,ME,NHtrans-1,3-Dichloropropene AIHA,NJ,NY,ME,NH,VA1,2-Dichloro-1,1,2,2-tetrafluoroethane (Freon 114) AIHA,NJ,NY,ME,NH,VA1,4-Dioxane AIHAEthanol AIHAEthyl Acetate AIHA,FL,NJ,NY,ME,NH,VAEthylbenzene AIHA4-Ethyltoluene AIHA,NJ,NY,ME,NH,VAHeptane AIHA,NJ,NY,ME,NH,VAHexachlorobutadiene AIHA,FL,NJ,NY,ME,NH,VAHexane AIHA2-Hexanone (MBK) AIHA,NY,ME,NHIsopropanol AIHA,FL,NJ,NY,ME,NH,VAMethyl tert-Butyl Ether (MTBE) AIHA,FL,NJ,NY,ME,NH,VAMethylene Chloride AIHA,FL,NJ,NY,ME,NH4-Methyl-2-pentanone (MIBK) NY,ME,NHNaphthalene AIHAPropene AIHA,FL,NJ,NY,ME,NH,VAStyrene AIHA,FL,NJ,NY,ME,NH,VA1,1,2,2-Tetrachloroethane Page 33 of 40 39 Spruce Street * East Longmeadow, MA 01028 * FAX 413/525-6405 * TEL. 413/525-2332 CertificationsAnalyte CERTIFICATIONS Certified Analyses included in this Report EPA TO-15 in Air AIHA,FL,NJ,NY,ME,NH,VATetrachloroethylene AIHATetrahydrofuran AIHA,FL,NJ,NY,ME,NH,VAToluene AIHA,NJ,NY,ME,NH,VA1,2,4-Trichlorobenzene AIHA,FL,NJ,NY,ME,NH,VA1,1,1-Trichloroethane AIHA,FL,NJ,NY,ME,NH,VA1,1,2-Trichloroethane AIHA,FL,NJ,NY,ME,NH,VATrichloroethylene AIHA,NY,ME,NHTrichlorofluoromethane (Freon 11) AIHA,NJ,NY,ME,NH,VA1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113) AIHA,NJ,NY,ME,NH1,2,4-Trimethylbenzene AIHA,NJ,NY,ME,NH1,3,5-Trimethylbenzene AIHA,FL,NJ,NY,ME,NH,VAVinyl Acetate AIHA,FL,NJ,NY,ME,NH,VAVinyl Chloride AIHA,FL,NJ,NY,ME,NH,VAm&p-Xylene AIHA,FL,NJ,NY,ME,NH,VAo-Xylene The CON-TEST Environmental Laboratory operates under the following certifications and accreditations: Code Description Number Expires 100033AIHA-LAP, LLC - ISO 17025:2017AIHA 03/1/2024 10899 NELAPNew York State Department of HealthNY 04/1/2024 2516 NELAPNew Hampshire Environmental LabNH 02/5/2024 MA007 NELAPNew Jersey DEPNJ 06/30/2023 E871027 NELAPFlorida Department of HealthFL 06/30/2023 MA00100State of MaineME 06/9/2023 460217Commonwealth of VirginiaVA 12/14/2023 Page 34 of 40 Page 35 of 40 Page 36 of 40 Page 37 of 40 Page 38 of 40 Page 39 of 40 Page 40 of 40 Appendix E DEQ Risk Calculator (January 2023) Version Date: Basis: Site Name: Site Address: DEQ Section: Site ID: Exposure Unit ID: Submittal Date: Reviewed By: Prepared By:Hart & Hickman, PC Hart & Hickman, PC Worst-Case North Carolina Department of Environmental Quality Risk Calculator Phase 8 Brightwalk Development - Double Oaks Brownfields Site Brownfields 11037-07-060 January 2023 November 2022 EPA RSL Table North Carolina DEQ Risk Calculator Complete Exposure Pathways Version Date: January 2023 Basis: November 2022 EPA RSL Table Site ID: 11037-07-060 Exposure Unit ID: Worst-Case 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 Input Form 1A VAPOR INTRUSION PATHWAYS DIRECT CONTACT SOIL AND WATER PATHWAYS Resident Non-Residential Worker Recreator/Trespasser Resident Non-Residential Worker CONTAMINANT MIGRATION PATHWAYS Groundwater Surface Water North Carolina DEQ Risk Calculator Exposure Point ConcentrationsVersion Date: January 2023Basis: November 2022 EPA RSL TableSite ID: 11037-07-060 Exposure Unit ID: Worst-Case Description of Exposure Point Concentration Selection: Exposure Point Concentration (ug/m3) Notes:CAS Number Chemical Minimum Concentration (Qualifier) Maximum Concentration (Qualifier)Units Location of Maximum Concentration Detection Frequency Range of Detection Limits Concentration Used for Screening Background Value Screening Toxicity Value (Screening Level) (n/c) Potential ARAR/TBC Value Potential ARAR/TBC Source COPC Flag (Y/N) Rationale for Selection or Deletion 18 67-64-1 Acetone ug/m3 2 71-43-2 Benzene ug/m3 6.9 75-27-4 Bromodichloromethane ug/m3 0.62 75-15-0 Carbon Disulfide ug/m3 140 67-66-3 Chloroform ug/m3 1.7 74-87-3 Chloromethane ug/m3 1.3 110-82-7 Cyclohexane ug/m3 2.4 75-71-8 Dichlorodifluoromethane ug/m3 2.4 123-91-1 Dioxane, 1,4-ug/m3 0.93 75-00-3 Ethyl Chloride (Chloroethane)ug/m3 1.9 100-41-4 Ethylbenzene ug/m3 1.3 109-99-9 ~Tetrahydrofuran ug/m3 0.59 142-82-5 Heptane, N-ug/m3 0.62 591-78-6 Hexanone, 2-ug/m3 0.66 108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone)ug/m3 0.53 100-42-5 Styrene ug/m3 6 127-18-4 Tetrachloroethylene ug/m3 9.9 108-88-3 Toluene ug/m3 3.1 95-63-6 Trimethylbenzene, 1,2,4-ug/m3 0.59 108-67-8 Trimethylbenzene, 1,3,5-ug/m3 5.7 108-38-3 Xylene, m-ug/m3 2.3 95-47-6 Xylene, o-ug/m3 Input Form 2D Soil Gas Exposure Point Concentration Table Note: 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 calculations North Carolina DEQ Risk Calculator Risk for Individual Pathways Output Form 1A Version Date: January 2023 Basis: November 2022 EPA RSL Table Site ID: 11037-07-060 Exposure Unit ID: Worst-Case 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 3.7E-05 5.6E-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 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? 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: 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: 11037-07-060 Exposure Unit ID: Worst-Case 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 18 0.54 -- 71-43-2 Benzene 2 0.06 3.6E-01 6.3E+00 1.7E-07 1.9E-03 75-27-4 Bromodichloromethane 6.9 0.207 7.6E-02 -2.7E-06 75-15-0 Carbon Disulfide 0.62 0.0186 -1.5E+02 2.5E-05 67-66-3 Chloroform 140 4.2 1.2E-01 2.0E+01 3.4E-05 4.1E-02 74-87-3 Chloromethane 1.7 0.051 -1.9E+01 5.4E-04110-82-7 Cyclohexane 1.3 0.039 -1.3E+03 6.2E-0675-71-8 Dichlorodifluoromethane 2.4 0.072 -2.1E+01 6.9E-04123-91-1 Dioxane, 1,4-2.4 0.072 5.6E-01 6.3E+00 1.3E-07 2.3E-03 75-00-3 Ethyl Chloride (Chloroethane)0.93 0.0279 -8.3E+02 6.7E-06 100-41-4 Ethylbenzene 1.9 0.057 1.1E+00 2.1E+02 5.1E-08 5.5E-05 109-99-9 ~Tetrahydrofuran 1.3 0.039 -4.2E+02 1.9E-05 142-82-5 Heptane, N-0.59 0.0177 -8.3E+01 4.2E-05 591-78-6 Hexanone, 2-0.62 0.0186 -6.3E+00 5.9E-04108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone)0.66 0.0198 -6.3E+02 6.3E-06100-42-5 Styrene 0.53 0.0159 -2.1E+02 1.5E-05 127-18-4 Tetrachloroethylene 6 0.18 1.1E+01 8.3E+00 1.7E-08 4.3E-03 108-88-3 Toluene 9.9 0.297 -1.0E+03 5.7E-05 95-63-6 Trimethylbenzene, 1,2,4-3.1 0.093 -1.3E+01 1.5E-03 108-67-8 Trimethylbenzene, 1,3,5-0.59 0.0177 -1.3E+01 2.8E-04 108-38-3 Xylene, m-5.7 0.171 -2.1E+01 1.6E-0395-47-6 Xylene, o-2.3 0.069 -2.1E+01 6.6E-04 Cumulative:3.7E-05 5.6E-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