26093_Dynamic Auto Works II_Foundry_WPCR_no appendix 20230829

August 29, 2023

Carolyn Minnich
North Carolina Department of Environmental Quality
Division of Waste Management
Brownfields Program
217 West Jones Street
Raleigh, North Carolina 27603

Subject: Work Plan Completion Report
Dynamic Auto Works II and Foundry I
600 Eldridge Street
Charlotte, Mecklenburg County, North Carolina
Brownfields Project Nos. 26093-22-060 & 17021-13-060

Dear Ms. Minnich:

ONE Environmental Group of Carolina, PLLC (ONE) is pleased to submit this Work Plan
Completion Report to the North Carolina Department of Environmental Quality (NCDEQ) Division
of Waste Management (DWM) Brownfields Redevelopment Section (Brownfields) for the above-
referenced site. This report is being submitted on behalf of the prospective developer:

Mr. Welch Liles
Managing Director
AP Foundry, LP
1616 Camden Road, Suite 210
Charlotte, North Carolina 28203
We at ONE appreciate your review of this report. Should you have any questions, please do not
hesitate to contact us at [phone] or by email at [e-mail].

Sincerely,
ONE Environmental Group of Carolina, PLLC

Hillary S. Goodell, PE
Project Manager
Enclosure
Jenny Tang
Project Manager
ONE Environmental Group of Carolina, PLLC
#P‐0771 Engineering
www.oneenv.com
Work Plan Completion Report Dynamic Auto Works II and Foundry I
600 Eldridge Street
Charlotte, Mecklenburg County, North Carolina
Brownfields Project Nos.:
26093-22-060 & 17021-13-060
Prepared by:
ONE Environmental Group of Carolina, PLLC
Prepared on behalf of:
AP Foundry, LP
Date: August 29, 2023

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TABLE OF CONTENTS 1.0 Introduction ................................................................................................................................................................. 3 2.0 Methodology ................................................................................................................................................................ 3
2.1 Soil ......................................................................................................................................................................................................... 3
2.2 Soil Gas and Sub-Slab Soil Gas .................................................................................................................................................. 5
2.3 Groundwater .................................................................................................................................................................................... 6 3.0 Results ............................................................................................................................................................................ 7
3.1 Soil ......................................................................................................................................................................................................... 7
3.2 Soil Gas and Sub-Slab Soil Gas ............................................................................................................................................... 10
3.3 Groundwater ................................................................................................................................................................................. 10 4.0 Findings and Conclusions .................................................................................................................................... 11
4.1 Soil ...................................................................................................................................................................................................... 11
4.2 Soil Gas and Sub-Slab Soil Gas ............................................................................................................................................... 11
4.3 Groundwater ................................................................................................................................................................................. 12

FIGURES Figure 1 Site Location Map Figure 2 Site Map Figure 3 Sample Location Map Figure 4 Potentiometric Map
TABLES Table 1 Summary of Groundwater Elevation Data Table 2 Summary of Soil Analytical Data Table 3 Summary of TCLP Analytical Data Table 4 Summary of Sub-Slab and Exterior Soil Gas Analytical Data Table 5 Summary of Groundwater Analytical Data
APPENDICES Appendix A Soil Boring Logs Appendix B Soil Laboratory Analytical Reports Appendix C Sub-Slab and Soil Gas Laboratory Analytical Report
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Appendix D TVS Field Report Appendix E Risk Calculation Outputs Appendix F Groundwater Laboratory Analytical Report Appendix G Waste Manifest
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1.0 Introduction On behalf of AP Foundry, LP (the Prospective Developer or PD), ONE Environmental Group of Carolina, PLLC (ONE) has prepared this Work Plan Completion Report for the North Carolina Department of Environmental Quality (NCDEQ) Brownfields Redevelopment Section (Brownfields) Project Nos. 26093-22-060 (Dynamic Auto Works II) and 17021-13-060 (Foundry I). The activities described herein were completed in accordance with the site’s In-Situ Soil
Characterization & Soil Gas Work Plan that was approved by NCDEQ Brownfields on April 7, 2023. PD intends to redevelop the Dynamic Auto Works II property with a commercial retail structure with an associated parking deck and high-density residential above. The new development will encroach into a portion of Foundry I where commercial offices currently exist at 619 South Cedar Street and 623 South Cedar Street. Redevelopment plans include the full demolition of the 623 South Cedar Street structure and a partial demolition of the 619 South Cedar Street structure. Additionally, a third commercial structure present on the Dynamic Auto Works II property will be demolished and cleared for the new development. Preliminary designs include ground-floor retail and restaurant space, a four (4) level parking garage, and seven (7) upper-floor residential apartments. The site development will total approximately two (2) acres. A Site Location Map and Site Map are included in Figure 1 and Figure 2, respectively.
2.0 Methodology
2.1 Soil ONE conducted soil assessment activities from April 17-19, 2023, to characterize site soils and to determine proper soil disposal procedures before grading activities begin. The assessment activities were performed in accordance with the NC DEQ Inactive Hazardous Sites Branch (IHSB)
Guidelines for Assessment and Cleanup (Guidelines) dated July 2021 and the most recent versions of the U.S. Environmental Protection Agency (EPA) Region IV Laboratory Services and Applied Science Division (LSASD) Field Branches Quality System and Technical Procedures guidance. Prior to conducting field activities, ONE contacted the North Carolina 811 public utility locator to mark sub-grade utilities at the site. ONE also contracted a private utility locator (Ground Penetrating Radar Systems, LLC) to clear each proposed boring location at the site.
2.1.1 Sample Location Soil excavations at the site are estimated to extend up to 20 feet below ground surface (ft bgs) with bedrock anticipated to be encountered at depths beyond 20 ft bgs. ONE divided the site into 13 in-situ soil characterization sections (EX-1 through EX-13) based on proposed excavation areas, cut depths, and anticipated bedrock. In each soil characterization section, a set of three (3) (A through C) or five (5) (A through E) soil borings were advanced to pre-determined excavation depths or until drill rig refusal. In addition to the soil characterization sections, two (2) soil borings (SB-1 and SB-2) were advanced to a depth of approximately 2 ft bgs in the interior and exterior of the former Dynamic Auto Works building to evaluate for impacts by the former auto repair facility. A Sample Location Map is included in Figure 3.
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The following describes deviations from the original scope of work regarding soil:
• Due to the proximity of an existing structure, sample location EX-5 SG-7/A was offset 5 ft to the northwest.
• Sample locations EX-11 B and EX-11 C were offset 5 ft to the south and sample location EX-10 D was offset 3ft to the southwest due to the proximity of underground stormwater drainage infrastructure.
• Due to steep topography and safety concerns, sample location EX-10 SG-12/A was offset 3 ft to the northwest and sample locations EX-12 SG-16/B, EX-12 C, and EX-13 SG-17/A were offset 10 ft, 10 ft, and 15 ft to the southeast, respectively.
2.1.1 Installation ONE contracted M&W Drilling of Knoxville, Tennessee to advance each site characterization zone boring with a track-mounted direct push technology (DPT) drill rig. Soil cores were retrieved from each boring in five (5) foot interval acetate-lined macro core sleeves. Each core was field screened for volatile organic vapors using a calibrated photoionization detector (PID) and logged for lithologic description and visual/olfactorily observations. Soil boring logs with field screening results are included in Appendix A. The soil boring within the former auto repair shop (SB-1) was advanced using a rotary hammer drill and decontaminated stainless-steel hand auger. The soil boring on the exterior of the former auto repair shop (SB-2) was advanced using a decontaminated stainless-steel hand auger.
2.1.2 Sample Collection A total of 49 grab and 49 composite soil samples were collected from the in-situ soil characterization sections of the site. An additional two (2) grab soil samples were collected from the former auto repair facility area. Each sample was representative of soil from 0-2 ft bgs, 2-5 ft bgs, 5-10 ft bgs, and 10-20 ft bgs, where applicable. Soil cores from each borehole were split in half longitudinally and the soils were evenly divided into two (2) sealed plastic bags per sample interval. The first sealed plastic bag was placed on ice within a cooler. The second sealed plastic bag was allowed to volatilize for approximately five (5) minutes. After approximately five (5) minutes, the volatilized bag was screened using a PID. Grab soil samples were collected from the bag stored on ice corresponding to the highest PID reading for volatile organic compound (VOC) analysis by EPA Method 8260D. After collecting the grab sample, the bags stored on the ice were homogenized per sample depth interval within each soil characterization section. Composite samples were collected from the homogenized soil for semi-volatile organic compound (SVOC) analysis by EPA Method 8270E and Resource Conservation and Recovery Act (RCRA) metals plus hexavalent chromium analysis by EPA Methods 6020B/7471A/SW7199. The soil samples were collected into laboratory-supplied sample containers, labeled with the date, time, and sample identification. The samples were then placed in a laboratory-supplied sample cooler with ice and submitted to Waypoint Analytical under standard chain of custody protocol. For field and laboratory Quality Assurance and Quality Control (QA/QC) purposes, a duplicate soil
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sample was collected at EX-1 (0-2’) and EX-8 (2-5’) and analyzed for the same compounds as the parent sample. One (1) trip blank per cooler containing VOC analysis samples was submitted for analysis of VOCs by EPA Method 8260D. A copy of the laboratory analytical reports with the chain of custody record is included in Appendix B. Following sampling activities, the soil borings were properly abandoned, and the surfaces were repaired similarly to pre-drilling conditions unless designated as a soil gas sample location.
2.2 Soil Gas and Sub-Slab Soil Gas ONE contracted Total Vapor Solutions (TVS) to conduct soil gas and sub-slab soil gas assessment activities at the site. The purpose of the event was to evaluate vapor intrusion risks within the footprint of the new development. Assessment activities at the site were performed in accordance with the NCDEQ Division of Waste Management (DWM) Vapor Intrusion Guidance dated March 2018.
2.2.1 Sample Location A total of 16 select boreholes from the soil sampling event were repurposed for soil gas sampling activities. In addition, one (1) new borehole was advanced with the DPT drill rig in the northwestern portion of the site (SG-1) to a depth of 10 ft bgs. Sample collection was selected in every planned stairwell, elevator, ground floor tenant space, and garage area. In addition, a total of four (4) temporary sub-slab soil gas sample points (SS-1 through SS-4) were installed across the existing structures slated for demolition. The sample locations are depicted in Figure 3.
2.2.2 Installation Soil Gas A total of 17 temporary soil gas sample points (SG-1 though SG-17) were installed across the footprint of the new development. Each soil gas sample point was set at a minimum of six (6) ft bgs. A vapor implant constructed of a stainless-steel screen and 1/8” Nylaflow tubing was advanced within the borehole. Clean quartz sand was placed around the annular space of the implant and extended to approximately six (6) inches above the top of the implant. The sampling points were completed by placing hydrated bentonite from the top of the filter sand to approximately one (1) ft bgs and left to equilibrate for a minimum of 24 hours before sampling. Sub-Slab Soil Gas A total of four (4) temporary sub-slab soil gas sample points were advanced at the site; two (2) in the building located at 623 South Cedar Street, one (1) in the building located at 619 South Cedar Street, and one (1) in the former auto repair facility located at 600 Eldridge Street. A rotary hammer drill was used to penetrate the entire thickness of the structure’s concrete slab and an additional six (6) inches beneath the slab. A vapor implant constructed of airstone and 1/8” Nylaflow tubing was advanced within the borehole to at least eight (8) inches beneath the slab. Clean quartz sand was placed around the annular space of the implant. Two (2) inches of dry granular bentonite was placed directly on top of the quartz sand. Additional granular bentonite
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(hydrated in 2” lifts) was added to ensure the entire thickness of the concrete slab was sealed. The sub-slab soil gas vapor point was left to equilibrate for a minimum of 24 hours before sampling.
2.2.3 Leak Check Prior to sampling, a leak check test was performed at each soil gas and sub-slab soil gas sample location. A shroud was constructed around the entire sample train and filled with helium gas. A sample was collected from the gas in the shroud into a Tedlar® bag and analyzed for helium concentrations using a helium gas detector. Sample points were purged and sampled outside of the shroud into a separate Tedlar® bag. The vapor was analyzed using the helium gas detector to ensure that helium concentrations were less than 10% of the concentration measured within the shroud.
2.2.4 Sample Collection Following a successful field leak check, the soil gas and sub-slab soil gas samples were collected into 400 mL batch-certified summa canisters for laboratory analysis. Each summa canister was connected to the appropriate flow controller and sample collection apparatus that included an inline purge device. A minimum of three (3) volumes of the annular space plus the tubing volume was purged using the inline purge device. A vacuum test on the summa canister and flow control device was performed to ensure no ambient air was drawn during the sample collection. After completion of the vacuum test, the summa canister was “opened” for sample collection. Upon completion of the sampling, the final vacuum pressure in each Summa canister was reported to be between three (3) and six (6) inches of mercury (in Hg). All samples were delivered under standard chain of custody protocols to Analytical Environmental Services of Atlanta, Georgia for VOC analysis by EPA Method TO-15. The laboratory recorded vacuum pressures for each Summa canister upon receipt of the samples were between 2.85 and 6.719 in Hg. For field and laboratory QA/QC purposes, one (1) duplicate soil gas sample (DUP-1) was taken at SG-17, and one (1) duplicate sub-slab soil gas sample (DUP-2) was taken at SS-3. A T-manifold was constructed for simultaneous sample collection. The duplicate samples were analyzed for the same compounds as the parent sample. A copy of the laboratory analytical report with chain of custody record is included in Appendix C. Following sampling activities, the boreholes were properly abandoned, and the surfaces were repaired similarly to pre-drilling conditions. There were no deviations from the original scope of work regarding the collection of soil gas samples. The TVS field report is included in Appendix D.
2.3 Groundwater ONE conducted groundwater assessment activities on April 17, 2023, to evaluate current contaminant concentrations. The groundwater sampling activities were performed in accordance with the USEPA Low Stress (Low Flow) Purging and Sampling Procedure for the Collection of
Groundwater Samples from Monitoring Wells, dated September 2017, and the NCDEQ Guidelines for
Sampling (December 2008).
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2.3.1 Sample Collection Groundwater samples were collected from four (4) preexisting monitoring wells (MW-1 through MW-4) at the site. Prior to sample collection, depth to groundwater measurement was collected using an interface probe capable of measuring liquid phase hydrocarbon (LPH) within 0.01 feet. Groundwater depths and elevation data are provided in Table 1. A peristaltic pump and dedicated polyethylene tubing was used for groundwater retrieval and sample collection. At least three (3) well volumes were purged from the well prior to sample collection. Upon the visual reduction of turbidity, groundwater samples were collected into laboratory-supplied sample containers. All groundwater samples were delivered to Waypoint Analytical under standard chain of custody protocols for the analysis of VOCs by EPA Method 8260D, SVOCs by EPA Method 8270, and RCRA metals plus hexavalent chromium by EPA Methods 6020/7471/SM-3500CrB. For field and laboratory QA/QC purposes, one (1) duplicate groundwater sample (DUP-1) was collected at MW-2. The duplicate sample was analyzed for the same compounds as the parent sample. Additionally, one (1) trip blank per cooler containing VOC analysis samples and one (1) sample of the consequent investigative derived waste (IDW) was submitted for VOC analysis by EPA Method 8260D. A copy of the laboratory analytical report with chain of custody record is included in Appendix E. The following describes deviations from the original scope of work regarding groundwater:
• Groundwater was sampled utilizing a peristaltic pump with dedicated tubing in lieu of a submersible pump.
• Temporary monitoring well TW-3 was not located onsite; therefore, no groundwater sample was collected.
3.0 Results
3.1 Soil Laboratory analytical results were screened against the NCDEQ Health-Based Preliminary Soil Remediation Goals (PSRGs) (January 2023) and the Rule of 20 Values derived from a 1:20 factor of the USEPA Toxicity Characteristic Leaching Procedure (TCLP) Maximum Concentration of Contaminants for Toxicity Characteristic (November 2004). For general evaluation, soil analytical results were also compared to local concentrations of naturally occurring metals in soil using data from the local Jim Griffin Roofing Company (BF No. 22026-18-060) and Berryhill-Thrift Road (BF No. 21061-17-060) properties. Laboratory analytical results reported low detections of various VOCs and SVOCs across the site, predominantly in the shallow 0-2’ intervals and at estimated laboratory values denoted by a “J”. Only benzo(a)pyrene was detected at concentrations above the Residential PSRG in the composite samples collected from sections EX-8 through EX-11. The concentrations of benzo(a)pyrene in these sections ranged from 0.217 milligrams per kilogram (mg/kg) to 0.612 mg/kg which exceeds
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the Residential PSRG of 0.11 mg/kg and the Protection of Groundwater (POG) PSRG of 0.12 mg/kg. Sample EX-8 (0-2’) also reported detections of 1-methylnaphthalene and naphthalene above the POG PSRG with concentrations of 0.419 mg/kg and 0.489 mg/kg, respectively. Sample EX-10 (2-5’) reported a detection of benzo(a)anthracene at 0.578 mg/kg which is above the POG PSRG of 0.35 mg/kg. No other volatile compounds were detected above a screening criterion. It should be noted that acetone was detected in all samples; however, acetone is a common laboratory contaminant and not a constituent of concern at the site. RCRA metals arsenic, barium, cadmium, chromium, lead, selenium, silver, mercury, and hexavalent chromium were detected across the site. The following RCRA metals were detected at concentrations above a regulatory screening criterion:
• Arsenic was detected in all 51 samples collected at the site. Of the 51 samples, 34 samples reported concentrations above the Residential PSRG of 0.68 mg/kg, seven (7) samples reported concentrations above the Industrial/Commercial PSRG of 3.0 mg/kg, and one (1) sample reported a concentration above the POG PSRG of 5.8 mg/kg. The arsenic concentrations at the site ranged between 0.326 mg/kg to 21.7 mg/kg which is consistent with published background concentrations of the area that ranged from 0.34 mg/kg to 23 mg/kg. The arsenic concentrations did not warrant additional TCLP analysis.
• Chromium was detected in all 51 samples collected at the site. Of the 51 samples, five (5) samples reported concentrations above the Residential PSRG of 0.31 mg/kg, 46 samples reported concentrations above the Industrial/Commercial PSRG of 6.5 mg/kg, and all samples reported concentrations above the POG PSRG of 3.8 mg/kg. Most chromium concentrations detected at the site ranged between 4.54 mg/kg to 78.6 mg/kg which is consistent with published background concentrations of the area that ranged from 40.3 mg/kg to 77.5 mg/kg. Only three (3) samples (EX-6 [2-5’], EX-6 [10-20’], and SB-2) reported concentrations that were notably above background concentrations and above the Rule of 20 Value of 100 mg/kg. These samples were resubmitted for TCLP analysis and returned with chromium concentrations below the TCLP regulatory screening value of 5.0 mg/L.
• Lead was detected in all 51 samples collected at the site. No concentrations exceeded the Residential or Industrial/Commercial PSRGs. Most lead concentrations detected at the site ranged between 2.85 mg/kg to 38.1 mg/kg which is consistent with published background concentrations of the area that range from 10.2 mg/kg to 32.3 mg/kg. Four (4) samples (EX-2 [0-2’], EX-8 [2-5’], EX-12 [0-2’], and SB-2) reported concentrations that were notably above background concentrations, but below the Rule of 20 Value ranging from 65.5 mg/kg to 99.9 mg/kg. Six (6) samples (EX-5 [2-5’], EX-8 [0-2’], EX-9 [0-2’], EX-10 [2-5’], EX-11 [0-2’], and EX-11 [2-5’]) reported concentrations that were significantly above background concentrations and above the Rule of 20 Value of 100 mg/kg. These samples were resubmitted for TCLP analysis and returned with lead concentrations below the TCLP regulatory screening value of 5.0 mg/L. Through inadvertence, sample EX-9 [0-2’] was not resubmitted for TCLP analysis. Considering that the total lead concentration for EX-9 [0-2’] was only slightly above the Rule of 20 Value at 106 mg/kg, the sample result was discussed
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with the laboratory which stated the margin of error could have resulted in a concentration as low as 84.8 mg/kg. Based on the margin of error and the results of the completed TCLP analysis demonstrating concentrations significantly below the TCLP regulatory screening level, this sample does not appear to be at risk of significant hazardous toxicity.
• Hexavalent chromium was detected sporadically across the site in 20 samples. Of the 20 samples, 17 samples reported concentrations above the Residential PSRG of 0.31 mg/kg and one (1) sample reported a concentration above the POG PSRG of 3.8 mg/kg. No concentrations exceeded the Industrial/Commercial PSRGs. Hexavalent chromium concentrations detected at the site ranged between 0.211 mg/kg to 3.95 mg/kg.
• Mercury was detected sporadically across the site in 28 samples. Of the 28 samples, two (2) samples reported concentrations above the Residential PSRG of 2.3 mg/kg and two (2) samples reported concentrations above the POG PSRG of 1.0 mg/kg. No concentrations exceeded the Industrial/Commercial PSRGs. Most mercury concentrations detected at the site ranged between 0.0286 mg/kg to 0.145 mg/kg which is within the published background concentrations of the area that range from 0.0735 mg/kg to 0.148 mg/kg. Eight (8) samples (EX-5 [2-5’], EX-8 [0-2’], EX-9 [0-2’], EX-10 [0-2’], EX-11 [0-2’], EX-11 [2-5’], EX-11 [5-10’], and EX-12 [0-2’]) reported concentrations that were above background concentrations ranging from 0.207 mg/kg to 2.79 mg/kg. The mercury concentrations did not warrant additional TCLP analysis.
• Selenium was detected in all 51 samples collected at the site. Of the 51 samples, two (2) samples reported concentrations above the POG PSRG of 2.1 mg/kg. No concentrations exceeded the Residential or Industrial/Commercial PSRGs. Most selenium concentrations detected at the site ranged between 0.259 mg/kg to 1.61 mg/kg which is consistent with the published background concentrations of the area that range from 0.0753 mg/kg to 1.35 mg/kg. One (1) sample (EX-2[10-20’]) reported a concentration that was above background concentrations at 5.4 mg/kg. Analytical data for the duplicate soil samples (DUP-1 and DUP-2) were generally consistent with their respective parent samples, indicative of good quality control. A summary of the in-situ soil characterization results is presented in Table 2. A summary of the TCLP analysis results is presented in Table 3. A copy of the laboratory analytical report and chain of custody record is included in Appendix B.
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3.2 Soil Gas and Sub-Slab Soil Gas Laboratory analytical results were compared to the NCDEQ non-residential sub-slab and exterior soil gas screening levels (SGSLs) based on the future ground-floor commercial retail and parking use of the site. Laboratory results were also analyzed through the NCDEQ Vapor Intrusion Risk Calculator (January 2023) using the non-residential exposure scenario. Laboratory analytical results reported detections of various VOCs across the site. Only compounds 1,3-butadiene, tetrachloroethene (PCE), and trichloroethene (TCE) were reported at concentrations above their respective SGSLs in the following sample locations:
•1,3-butadiene was detected at sample locations SG-2 and SG-14 at 90 micrograms per cubicmeter (µg/m3) and 110 µg/m3, respectively, which are above the SGSL 41 µg/m3.
•PCE was detected at sample location SS-1 at 4,000 µg/m3 which is above the SGSL of 3,500µg/m3.
•TCE was detected at sample locations SG-1, SG-10, and SG-11 at 660 µg/m3, 650 µg/m3, 520µg/m3, and 3,100 µg/m3, respectively, which are above the SGSL of 180 µg/m3.Data for the duplicate soil gas samples (DUP-1 and DUP-2) were generally consistent with their respective parent samples, indicative of good quality control. Cumulative risk values were calculated for each sub-slab and exterior soil gas sample. The risk calculation screenings were based on a lifetime incremental cancer risk value of 1.0E-06 for potential carcinogens and a hazard quotient value of 1.0 for potential non-carcinogens. Exceedances of the acceptable carcinogenic risk value were identified for samples SG-1, SG-2, SG-10, SG-11, SG-13, and SG-14 with values ranging from 3.0E-06 to 1.1E-05. Sample SG-13 also resulted in an exceedance of the hazard quotient with a value of 3.7. A summary of the sub-slab and exterior soil gas analytical data is presented in Table 4. A copy of the laboratory report is included in Appendix C. Risk calculations are included in Appendix E.
3.3 Groundwater Laboratory analytical results were compared to the NCDEQ 15A NCAC 02L .0202 Groundwater Quality Standards (2L GWQS) (2022) and Gross Contamination Levels for Groundwater (GCLs) (2014). Historical groundwater analytical data for the site have reported chlorinated solvent impacts (primarily TCE) at concentrations that exceed 2L GWQS. Laboratory analytical results reported detections of several VOCs, SVOCs, and RCRA metals across the site. Only VOC TCE was detected at concentrations above the 2L GWQS in two (2) sample locations and in the consequent IDW. Samples MW-2, MW-3, and the IDW reported TCE concentrations of 71.5 µg/L, 83.4 µg/L, and 45.2 µg/L, respectively. No exceedances of the GCLs were reported.
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The data for the duplicate groundwater sample (DUP-1) was generally consistent with the respective parent sample, indicative of good quality control. A summary of the groundwater analytical data is presented in Table 5. A copy of the laboratory report is included in Appendix F. A potentiometric map is included in Figure 4. IDW generated from the groundwater sampling event was properly disposed of as non-hazardous through CCI Environmental Services, Inc. A copy of the manifest is included in Appendix G.
4.0 Findings and Conclusions ONE has performed assessment activities at the Foundry and Dynamic Auto Works II properties in accordance with the NCDEQ Brownfields approved In-Situ Soil Characterization & Soil Gas Work
Plan dated April 7, 2023.
4.1 Soil Laboratory analytical results for soil reported low-level detections of various VOCs and SVOCs as well as metals across the site. All VOC and SVOC concentrations except for benzo(a)pyrene were reported below Residential PSRGs. Benzo(a)pyrene was detected in the primarily shallow intervals of excavation zones EX-8 through EX-11 at concentrations above the Residential PSRG but below the Industrial/Commercial PSRG. Several of these intervals with concentrations of benzo(a)pyrene above the Residential PSRG also had detections of SVOCs above the POG PSRG. RCRA metals arsenic, chromium, hexavalent chromium, mercury, and selenium were detected at concentrations ranging above the POG, Residential, and/or Industrial/Commercial PSRGs. Arsenic, chromium, hexavalent chromium, and selenium concentrations appeared to be generally consistent with published background concentrations in the area. Several chromium and lead detections were reported at concentrations above the Rule of 20 Value. Those sample intervals were resubmitted for TCLP analysis and returned with concentrations below the TCLP regulatory screening levels. The results are sufficient to characterize site soils for non-hazardous export and disposal. The concentration results will be screened against potential receiving site(s) for suitable transfer or disposal. A Soil Export Request letter dated July 26, 2023, was submitted to NCDEQ and is pending Brownfields’ review.
4.2 Soil Gas and Sub-Slab Soil Gas Laboratory analytical results for soil gas and sub-slab soil gas reported detections of 1,3-butadiene, PCE, and TCE above the Non-Residential SGSLs. The source of TCE and PCE appears to be from existing groundwater contamination underlying the site. The source of 1,3-butadiene is unknown as this compound was not detected in the co-located soil samples or groundwater. Risk calculations indicate that the cumulative risk is above the acceptable level for non-residential exposure scenarios at six (6) sample locations primarily in the eastern and western ends of the proposed development. Based on these results, a Vapor Intrusion Mitigation System (VIMS) is warranted at the site. The laboratory analytical data is sufficient to develop the engineered VIMS.
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Based on the planned development of ground-floor commercial with a multi-level parking deck and high-density residential above, a passive to active mitigation system is suitable to mitigate vapor intrusion risks. A vapor mitigation system plan will be prepared and submitted to Brownfields for review and approval.
4.3 Groundwater Laboratory analytical results for groundwater reported detections of the primary constituent of concern (COC) TCE in all four (4) existing monitoring wells. TCE concentrations above the 2L GWQS were reported in the two (2) monitoring wells located in the central-most portion of the development. These results are consistent with previous environmental assessments performed at the property which have identified migrated chlorinated solvents from an offsite source. Based on these results, groundwater encountered during redevelopment will be managed in accordance with a Brownfields-approved Environmental Management Plan (EMP).
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Figure 1Site Location Map ±Property Boundary
600 Eldridge Street Charlotte, North Carolina
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Figure 2Site Map ±Development FootprintProperty BoundaryBrownfields Property ID: 17021-13-060Provisional Brownfields Property ID: 23042-19-060
600 Eldridge StreetCharlotte, North Carolina
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SS-1
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Excavation ZoneElevatorStairsBuilding FootprintProperty BoundaryApproximate Excavation Depth (ft)1020
Figure 3Sample Location Map
600 Eldridge StreetCharlotte, North Carolina
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D
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650
645
640
MW-1644.00amsl
MW-3650.38amsl
MW-2646.61amsl
MW-4642.44amsl
0 200100Feet
Notes:amsl = Elevation in Feet Above Mean Sea Level
^_
Figure 4Site Potentiometric Map ±Groundwater ContourInferred Groundwater Contour
!(Monitoring Well LocationExisting BuildingExisting Building to be DemoedProposed DevelopmentProposed Development Plan
ElevatorStairsProperty Boundary
ProjectManager:JPT
DrawnBy:EJK
CheckedBy:JPT
600 Eldridge StreetCharlotte, North Carolina
Tables
Table 1Summary of Groundwater Elevation DataMill Creek - Foundry and Dynamic Auto Works IICharlotte, North Carolina
Monitoring Location ID Gauging Date Depth to Water (ft btoc)Depth to Bottom (ft btoc)Top of Casing Elevation(ft amsl)Groundwater Elevation(ft amsl)MW-1 4/17/2023 26.77 30.14 670.77 644.00MW-2 4/17/2023 22.91 37.01 669.52 646.61MW-3 4/17/2023 26.02 42.55 676.40 650.38MW-4 4/17/2023 15.17 19.50 657.61 642.44Notes:Elevations estimated using Google Earth Pro 2023ft btoc = Feet Below Top of Casing; ft amsl = Feet Above Mean Sea Level
ONE Page 1 of 1 AP Foundry, LP
Table 2Summary of Soil Analytical DataMill Creek - Foundry and Dynamic Auto Works IICharlotte, North Carolina
Method Analyte Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result QAcetone0.038 0.036 0.032 0.016 J 0.074 0.009 J 0.031 J 0.012 J 0.014 J 0.004 J 0.041 0.006 J 25 14,000 210,000Benzene<0.0007 <0.0007 <0.0007 <0.0007 <0.0007 <0.0008 <0.0009 <0.0008 <0.0007 <0.0007 <0.0007 <0.0008 0.01 1.2 5.4Carbon Disulfide <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.001 <0.0009 <0.0008 <0.0008 <0.0008 <0.0009 4.1 160 740n-Hexane <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0009 <0.001 <0.0009 <0.0008 <0.0008 <0.0008 <0.0009 55 130 540Methyl Ethyl Ketone <0.0008 <0.0008 <0.0008 <0.0008 0.003 J <0.0009 <0.001 <0.0009 <0.0008 <0.0008 <0.0008 <0.0009 17 5,500 40,000Methylene Chloride 0.002 B J 0.001 B J 0.002 B J 0.001 B J <0.001 0.002 B J 0.004 B J 0.003 B J 0.002 B J <0.001 <0.001 <0.002 0.025 58 650Toluene<0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0009 <0.001 <0.0009 <0.0008 <0.0008 <0.0008 <0.0009 8.3 990 9,700Anthracene<0.171 <0.173 <0.180 <0.178 <0.182 <0.189 <0.231 <0.195 <0.175 <0.175 <0.182 <0.200 1300 3,600 45,000Benzo(a)anthracene <0.166 <0.168 <0.175 <0.173 <0.177 <0.184 <0.224 <0.190 <0.170 <0.170 <0.177 <0.194 0.35 1.1 21Benzo(a)pyrene <0.176 <0.178 <0.185 <0.183 <0.187 <0.194 <0.237 <0.201 <0.179 <0.179 <0.187 <0.205 0.12 0.11 2.1Benzo(b)fluoranthene 0.279 J <0.176 <0.184 <0.181 0.192 J <0.193 <0.235 <0.199 <0.178 <0.178 <0.186 <0.204 1.2 1.1 21Benzo(ghi)perylene <0.163 <0.164 <0.171 <0.169 <0.173 <0.180 <0.219 <0.186 <0.166 <0.166 <0.173 <0.190 NS NS NSBenzo(k)fluoranthene <0.164 <0.166 <0.172 <0.170 <0.174 <0.181 <0.221 <0.187 <0.167 <0.167 <0.174 <0.191 12 11 210Chrysene<0.170 <0.172 <0.179 <0.176 <0.180 <0.188 <0.229 <0.194 <0.173 <0.173 <0.181 <0.198 36 110 2,100Fluoranthene0.219 J <0.149 <0.155 <0.153 <0.156 <0.163 <0.198 <0.168 <0.150 <0.150 <0.156 <0.172 670 480 6,000Indeno(123-cd)pyrene <0.214 <0.216 <0.226 <0.222 <0.228 <0.237 <0.289 <0.244 <0.219 <0.219 <0.228 <0.250 3.9 1.1 211-Methylnaphthalene <0.127 <0.128 <0.133 <0.132 <0.135 <0.140 <0.171 <0.145 <0.129 <0.129 <0.135 <0.148 0.11 18 732-Methylnaphthalene <0.120 <0.121 <0.126 <0.124 <0.127 <0.132 <0.161 <0.136 <0.122 <0.122 <0.127 <0.140 3.1 48 600Naphthalene<0.001 <0.174 <0.181 <0.179 <0.183 <0.190 <0.232 <0.196 <0.176 <0.176 <0.183 <0.201 0.39 2.1 8.8Phenanthrene<0.249 <0.252 <0.262 <0.259 <0.264 <0.275 <0.336 <0.284 <0.254 <0.254 <0.265 <0.291 NS NS NSPyrene0.19 J <0.162 <0.169 <0.166 <0.170 <0.177 <0.216 <0.183 <0.164 <0.164 <0.170 <0.187 440 360 4,500Arsenic1.52 1.87 1.04 0.725 3.41 0.934 1.27 1.76 3.01 2.04 1.05 0.758 5.8 0.68 3.0 100 0.34 - 23Barium45.3 55.9 230 63.9 90.7 64.1 93.9 64.3 75 31.1 39.4 37.3 580 3,100 47,000 2,000 69 - 133Cadmium<0.0310 0.089 J <0.0327 <0.0322 0.247 J 0.0432 J <0.0418 0.0823 J 0.0652 J <0.0317 <0.0330 0.0455 J 3 1.4 20 20 <0.103 - 2.36Chromium40.5 36.2 26.4 9.38 63.3 78.6 43.5 63.2 39.2 23.9 10.7 33.1 3.8 0.31 6.5 100 40.3 - 77.5Lead12.4 38.1 8.02 12.1 87.8 4.55 3.91 2.85 24.4 5.56 4.39 3.39 270 400 800 100 10.2 - 32.3Selenium0.653 0.627 1.49 0.702 1.16 0.834 1.76 5.4 1.18 0.728 0.359 0.753 2.1 78 1,200 20 0.753 - 1.35Silver0.0165 J 0.0393 J 0.0135 J <0.0083 0.134 J 0.0221 J 0.0554 J 0.0224 J 0.0766 J 0.0143 J 0.0423 J 0.0348 J 3.4 78 1,200 100 <0.199 - 12.7SW7199Chromium Hexavalent <0.169 <0.173 <0.178 <0.178 <0.179 1.07 1.73 3.95 0.811 <0.173 <0.179 1.57 3.8 0.31 6.5 -<0.328 - <0.3427471AMercury (Total)<0.0267 0.0948 J 0.0574 J <0.0279 0.194 J 0.0347 J <0.0318 <0.0294 0.127 J 0.0404 J <0.0251 <0.0304 1 2.3 9.7 4 0.0735 - 0.148Notes:All concentrations are reported in mg/kg (milligrams per kilogram).
The Rule of 20 Values are derived from a 1:20 factor of the United States Environmental Protection Agency (USEPA) Toxicity Characteristic Leaching Procedure (TCLP), November 2004, Maximum Concentration of Contaminants for Toxicity Characteristic.NS = No screening level established; - = Not applicableQ = Qualifier; J = Laboratory estimated value below the lowest calibration point/reporting limit; B = Analyte also detected in associated method blankBold = DetectionBold/Highlight = Exceedance of the PSRG or Rule of 20 Value. Underlined = Exceedance of Protection of Groundwater PSRG
6020B
22026-18-060) and Berryhill-Thrift Road (BF No. 21061-17-060) Brownfields properties.
8070E
8260D
--
Date Collected 04/19/23 04/20/23 04/18/23 Protection of Groundwater PSRG5-10'10-20'Rule of 20 Value Range0-2'DUP-2 2-5'5-10'0-2'2-5'Sample ID Residential PSRG Industrial/ Commercial PSRG5-10'10-20'0-2'2-5'
ONE Page 1 of 5 AP Foundry, LP
Table 2Summary of Soil Analytical DataMill Creek - Foundry and Dynamic Auto Works IICharlotte, North Carolina
Method Analyte Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result QAcetone0.012 J 0.035 0.018 J 0.005 J 0.017 J 0.075 0.019 J 0.008 J 0.061 0.026 0.021 J 0.014 J 25 14,000 210,000Benzene<0.0007 <0.0007 <0.0008 <0.0008 <0.0008 <0.0007 <0.0007 <0.0007 <0.0007 <0.0007 <0.0007 <0.0007 0.01 1.2 5.4Carbon Disulfide <0.0008 <0.0008 <0.0009 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 4.1 160 740n-Hexane <0.0008 <0.0008 <0.0009 <0.0009 <0.0009 <0.0008 <0.0008 <0.0008 <0.0008 <0.0009 <0.0008 <0.0008 55 130 540Methyl Ethyl Ketone (MEK)<0.0008 <0.0008 <0.0009 <0.0008 <0.0009 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 17 5,500 40,000Methylene Chloride 0.003 B J 0.003 B J 0.002 B J <0.001 <0.001 <0.001 0.002 B J <0.001 0.002 B J 0.002 B J 0.002 B J 0.002 B J 0.025 58 650Toluene<0.0008 <0.0008 <0.0009 <0.0009 <0.0009 <0.0008 <0.0008 <0.0008 <0.0008 <0.0009 <0.0008 <0.0008 8.3 990 9,700Anthracene<0.178 <0.176 <0.191 <0.185 <0.187 <0.173 <0.169 <0.172 <0.182 <0.184 <0.171 <0.183 1300 3,600 45,000Benzo(a)anthracene <0.173 <0.171 <0.186 <0.180 <0.182 <0.168 <0.164 <0.167 <0.177 <0.179 <0.166 <0.178 0.35 1.1 21Benzo(a)pyrene <0.183 <0.181 <0.196 <0.191 <0.192 <0.178 <0.173 <0.177 <0.187 <0.189 <0.176 <0.188 0.12 0.11 2.1Benzo(b)fluoranthene <0.181 <0.180 <0.195 <0.189 <0.191 0.201 J <0.172 <0.176 <0.186 <0.188 <0.174 <0.187 1.2 1.1 21Benzo(ghi)perylene <0.169 <0.167 <0.182 <0.176 <0.178 <0.164 <0.160 <0.164 <0.173 <0.175 <0.162 <0.174 NS NS NSBenzo(k)fluoranthene <0.170 <0.169 <0.183 <0.178 <0.179 <0.166 <0.161 <0.165 <0.174 <0.176 <0.164 <0.175 12 11 210Chrysene<0.176 <0.175 <0.190 <0.184 <0.186 <0.172 <0.167 <0.171 <0.181 <0.183 <0.170 <0.182 36 110 2,100Fluoranthene<0.153 <0.151 <0.164 <0.159 <0.161 0.22 J <0.145 <0.148 <0.157 <0.158 <0.147 <0.157 670 480 6,000Indeno(123-cd)pyrene <0.222 <0.220 <0.239 <0.232 <0.234 <0.216 <0.211 <0.216 <0.228 <0.230 <0.214 <0.229 3.9 1.1 211-Methylnaphthalene <0.132 <0.130 <0.141 <0.137 <0.139 <0.128 <0.125 <0.128 <0.135 <0.136 <0.126 <0.135 0.11 18 732-Methylnaphthalene <0.124 <0.123 <0.133 <0.130 <0.131 <0.121 <0.118 <0.120 <0.127 <0.129 <0.119 <0.128 3.1 48 600Naphthalene<0.179 <0.177 <0.192 <0.187 <0.188 <0.174 <0.170 <0.173 <0.183 <0.185 <0.172 <0.184 0.39 2.1 8.8Phenanthrene<0.259 <0.256 <0.278 <0.270 <0.272 <0.252 <0.245 <0.251 <0.265 <0.268 <0.249 <0.266 NS NS NSPyrene<0.166 <0.165 <0.179 <0.174 <0.175 <0.162 <0.158 <0.161 <0.171 <0.172 <0.160 <0.171 440 360 4,500Arsenic2.13 1.03 0.465 0.906 0.839 3.49 0.957 0.54 1.18 0.872 0.326 0.576 5.8 0.68 3 100 0.34 - 23Barium21.8 16 30.1 41.4 24.1 158 28.3 36.1 41.5 47.5 24.2 84.2 580 3,100 47,000 2,000 69 - 133Cadmium<0.0322 <0.0319 <0.0346 0.0387 J <0.0339 0.966 <0.0306 <0.0312 0.0333 J <0.0334 <0.0310 0.0633 J 3 1.4 20 20 <0.103 - 2.36Chromium22.4 20.1 5.26 28.5 34.5 26.3 8.44 5.7 23.5 123 7.88 265 3.8 0.31 6.5 100 40.3 - 77.5Lead5.14 5.89 4.2 4.53 6.5 104 6.87 5.79 11.8 12.4 5.11 11.7 270 400 800 100 10.2 - 32.3Selenium0.495 0.696 0.618 2.39 0.467 1.61 0.379 0.956 0.615 0.494 0.39 0.542 2.1 78 1,200 20 0.753 - 1.35Silver<0.0083 0.0087 J <0.0090 0.017 J <0.0088 0.404 0.0094 J <0.0081 0.0178 J 0.0277 J <0.0080 0.0774 J 3.4 78 1,200 100 <0.199 - 12.7SW7199Chromium Hexavalent <0.175 <0.174 <0.188 <0.183 0.314 0.864 <0.166 <0.170 <0.181 1.33 <0.170 2.72 3.8 0.31 6.5 -<0.328 - <0.3427471AMercury (Total)0.0334 J <0.0269 <0.0282 <0.0294 <0.0293 2.79 0.136 J <0.0252 0.0639 J 0.0759 J <0.0267 <0.0260 1 2.3 9.7 4 0.0735 - 0.148Notes:All concentrations are reported in mg/kg (milligrams per kilogram).
The Rule of 20 Values are derived from a 1:20 factor of the United States Environmental Protection Agency (USEPA) Toxicity Characteristic Leaching Procedure (TCLP), November 2004, Maximum Concentration of Contaminants for Toxicity Characteristic.NS = No screening level established; - = Not applicableQ = Qualifier; J = Laboratory estimated value below the lowest calibration point/reporting limit; B = Analyte also detected in associated method blankBold = DetectionBold/Highlight = Exceedance of the PSRG or Rule of 20 Value. Underlined = Exceedance of Protection of Groundwater PSRG
6020B
18-060) and Berryhill-Thrift Road (BF No. 21061-17-060) Brownfields properties.
8070E
8060D
--
04/17/23Date Collected 04/19/23 2-5'5-10'10-20'0-2'2-5'5-10'10-20'Sample ID 0-2'2-5'5-10'10-20'Protection of Groundwater PSRG Residential PSRG Industrial/ Commercial PSRG Rule of 20 Value Range0-2'
ONE Page 2 of 5 AP Foundry, LP
Table 2Summary of Soil Analytical DataMill Creek - Foundry and Dynamic Auto Works IICharlotte, North Carolina
Method Analyte Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result QAcetone0.023 0.02 J 0.071 0.008 J 0.062 0.071 0.09 0.027 0.012 J 0.048 0.031 0.013 J 25 14,000 210,000Benzene<0.0007 <0.0007 <0.0006 <0.0007 <0.0007 <0.0007 <0.0007 0.002 J <0.0007 <0.0007 <0.0007 <0.0007 0.01 1.2 5.4Carbon Disulfide <0.0008 <0.0008 <0.0007 <0.0007 <0.0008 <0.0007 <0.0007 <0.0007 <0.0008 <0.0007 <0.0008 <0.0008 4.1 160 740n-Hexane <0.0008 <0.0008 <0.0007 <0.0008 <0.0008 <0.0008 <0.0008 0.008 J <0.0008 <0.0008 <0.0008 <0.0008 55 130 540Methyl Ethyl Ketone (MEK)<0.0008 <0.0008 <0.0007 <0.0007 <0.0008 <0.0007 <0.0008 <0.0008 <0.0008 <0.0007 <0.0008 <0.0008 17 5,500 40,000Methylene Chloride <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 0.001 B J 0.001 B J 0.025 58 650Toluene<0.0008 <0.0008 <0.0007 <0.0008 <0.0008 <0.0008 <0.0008 0.001 J <0.0008 <0.0008 <0.0008 <0.0008 8.3 990 9,700Anthracene<0.169 <0.183 <0.158 <0.162 <0.170 <0.163 <0.166 <0.165 <0.175 <0.163 <0.177 <0.177 1300 3,600 45,000Benzo(a)anthracene <0.164 <0.178 <0.153 <0.158 <0.166 <0.159 <0.162 <0.161 <0.170 0.216 J <0.172 <0.172 0.35 1.1 21Benzo(a)pyrene <0.174 <0.188 <0.162 <0.167 0.217 J <0.168 <0.171 <0.170 <0.180 0.231 J <0.182 <0.182 0.12 0.11 2.1Benzo(b)fluoranthene <0.173 <0.187 <0.161 <0.166 0.329 J <0.167 <0.170 <0.169 <0.179 0.412 J <0.181 <0.181 1.2 1.1 21Benzo(ghi)perylene <0.161 <0.174 <0.150 <0.154 0.166 J <0.155 <0.158 <0.157 <0.167 0.216 J <0.169 <0.169 NS NS NSBenzo(k)fluoranthene <0.162 <0.175 <0.151 <0.156 <0.163 <0.157 <0.159 <0.158 <0.168 <0.156 <0.170 <0.170 12 11 210Chrysene<0.168 <0.182 <0.156 <0.161 0.201 J <0.162 <0.165 <0.164 <0.174 0.195 J <0.176 <0.176 36 110 2,100Fluoranthene<0.145 <0.157 <0.135 <0.140 0.228 J <0.141 <0.143 <0.142 <0.151 0.324 J <0.152 <0.152 670 480 6,000Indeno(123-cd)pyrene <0.212 <0.229 <0.197 <0.203 <0.213 <0.205 <0.208 <0.207 <0.219 0.242 J <0.222 <0.222 3.9 1.1 211-Methylnaphthalene <0.125 <0.135 <0.117 <0.120 0.419 J <0.121 <0.123 <0.122 <0.130 <0.121 <0.131 <0.131 0.11 18 732-Methylnaphthalene <0.118 <0.128 <0.110 <0.113 0.522 J <0.114 <0.116 <0.116 <0.122 <0.114 <0.124 <0.124 3.1 48 600Naphthalene<0.170 <0.184 <0.159 <0.164 0.489 J <0.165 <0.168 <0.167 <0.176 <0.164 <0.179 <0.179 0.39 2.1 8.8Phenanthrene<0.246 <0.266 <0.229 <0.236 0.313 J <0.238 <0.242 <0.241 <0.255 0.239 J <0.258 <0.258 NS NS NSPyrene<0.158 <0.171 <0.148 <0.152 0.234 J <0.153 <0.156 <0.155 <0.164 0.21 J <0.166 <0.166 440 360 4,500Arsenic1.89 0.821 0.486 0.386 3.48 1.36 1.47 0.458 0.585 2.71 0.932 0.6 5.8 0.68 3 100 0.34 - 23Barium74.9 48.8 57.2 53.1 183 122 125 27.5 76.7 97.4 63.3 103 580 3,100 47,000 2,000 69 - 133Cadmium<0.0307 <0.0332 <0.0286 0.0333 J 0.489 0.153 J 0.225 J <0.0300 0.0675 J 0.476 0.0592 J 0.0924 J 3 1.4 20 20 <0.103 - 2.36Chromium47.2 14 4.54 5.07 32.1 16.9 13.5 6.45 47.3 31.6 68.9 48.3 3.8 0.31 6.5 100 40.3 - 77.5Lead21.5 7.99 7.07 5.13 165 65.5 112 4.03 5.29 106 9.73 5.16 270 400 800 100 10.2 - 32.3Selenium0.76 0.355 0.781 0.351 0.967 0.707 0.592 0.259 J 1.34 1.04 1.03 1.32 2.1 78 1,200 20 0.753 - 1.35Silver0.0339 J 0.0097 J 0.0077 J 0.0086 J 0.271 J 0.108 J 0.127 J 0.0078 J 0.0151 J 0.131 J 0.0117 J 0.0103 J 3.4 78 1,200 100 <0.199 - 12.7SW7199Chromium Hexavalent <0.172 <0.183 <0.160 <0.160 0.375 0.54 0.74 <0.169 0.211 J <0.160 <0.175 <0.175 3.8 0.31 6.5 -<0.328 - <0.3427471AMercury (Total)0.136 J <0.0278 0.0286 <0.0235 0.578 <0.0253 0.11 J 0.0305 J <0.0249 0.207 J 0.0525 J <0.0254 1 2.3 9.7 4 0.0735 - 0.148Notes:All concentrations are reported in mg/kg (milligrams per kilogram).
The Rule of 20 Values are derived from a 1:20 factor of the United States Environmental Protection Agency (USEPA) Toxicity Characteristic Leaching Procedure (TCLP), November 2004, Maximum Concentration of Contaminants for Toxicity Characteristic.NS = No screening level established; - = Not applicableQ = Qualifier; J = Laboratory estimated value below the lowest calibration point/reporting limit; B = Analyte also detected in associated method blankBold = DetectionBold/Highlight = Exceedance of the PSRG or Rule of 20 Value. Underlined = Exceedance of Protection of Groundwater PSRG
6020B
22026-18-060) and Berryhill-Thrift Road (BF No. 21061-17-060) Brownfields properties.
8070E
8060D
--
Date Collected 04/17/23 04/19/2310-18.5'0-2'2-5'5-10'Residential PSRG Industrial/ Commercial PSRG Rule of 20 Value Range0-2'0-2'2-5'10-20'5-10'Protection of Groundwater PSRG2-5'DUP-1 5-10'Sample ID
ONE Page 3 of 5 AP Foundry, LP
Table 2Summary of Soil Analytical DataMill Creek - Foundry and Dynamic Auto Works IICharlotte, North Carolina
Method Analyte Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result QAcetone0.03 0.015 J 0.016 J 0.094 0.067 0.019 J 0.018 J 0.068 0.052 0.018 J 0.013 J 25 14,000 210,000Benzene<0.0007 <0.0007 <0.0007 <0.0007 <0.0007 <0.0007 <0.0007 <0.0007 <0.0007 <0.0008 <0.0008 0.01 1.2 5.4Carbon Disulfide <0.0008 <0.0008 0.001 J <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 4.1 160 740n-Hexane <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0009 <0.0009 <0.0009 55 130 540Methyl Ethyl Ketone (MEK)<0.0008 <0.0008 <0.0008 0.004 J <0.0008 <0.0008 <0.0008 0.002 J <0.0008 <0.0009 <0.0009 17 5,500 40,000Methylene Chloride 0.002 B J <0.001 0.002 B J <0.001 <0.001 0.002 B J 0.002 B J 0.002 B J 0.002 B J 0.002 B J 0.002 B J 0.025 58 650Toluene<0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0009 <0.0009 <0.0009 8.3 990 9,700Anthracene<0.176 0.183 J <0.181 <0.175 <0.178 <0.171 <0.180 <0.179 <0.184 <0.187 <0.187 1300 3,600 45,000Benzo(a)anthracene <0.172 0.578 J 0.282 J 0.188 J 0.24 J <0.166 <0.175 <0.174 <0.179 <0.182 <0.182 0.35 1.1 21Benzo(a)pyrene <0.181 0.612 J 0.484 J 0.219 J 0.287 J <0.175 <0.185 <0.184 <0.189 <0.192 <0.192 0.12 0.11 2.1Benzo(b)fluoranthene 0.303 J 1.02 0.755 J 0.307 J 0.374 J <0.174 <0.184 0.221 J <0.188 <0.191 <0.191 1.2 1.1 21Benzo(ghi)perylene 0.173 J 0.501 J 0.546 J <0.166 0.211 J <0.162 <0.171 <0.170 <0.175 <0.178 <0.178 NS NS NSBenzo(k)fluoranthene <0.169 0.292 J 0.236 J <0.168 <0.170 <0.163 <0.172 <0.171 <0.176 <0.179 <0.179 12 11 210Chrysene<0.175 0.535 J 0.221 J 0.213 J 0.246 J <0.169 <0.179 <0.177 <0.182 <0.186 <0.186 36 110 2,100Fluoranthene0.174 J 1.05 0.179 J 0.289 J 0.457 J <0.147 <0.155 0.157 J <0.158 <0.161 <0.161 670 480 6,000Indeno(123-cd)pyrene <0.221 0.62 J 0.65 J <0.219 0.237 J <0.214 <0.226 <0.224 <0.230 <0.234 <0.234 3.9 1.1 211-Methylnaphthalene <0.131 <0.136 <0.134 <0.130 <0.132 <0.126 <0.133 <0.132 <0.136 <0.138 <0.139 0.11 18 732-Methylnaphthalene <0.123 <0.128 <0.126 <0.122 <0.124 <0.119 <0.126 0.141 J <0.128 <0.131 <0.131 3.1 48 600Naphthalene<0.178 <0.184 <0.182 <0.176 <0.179 <0.172 <0.181 <0.180 <0.185 <0.188 <0.188 0.39 2.1 8.8Phenanthrene<0.257 0.794 J <0.263 <0.255 <0.259 <0.248 <0.262 <0.260 <0.268 <0.272 <0.272 NS NS NSPyrene<0.165 0.829 J <0.169 0.278 J 0.373 J <0.160 <0.169 <0.167 <0.172 <0.175 <0.175 440 360 4,500Arsenic2.09 4.2 0.696 21.7 2.98 1.47 0.917 3.17 1.47 0.834 0.768 5.8 0.68 3 100 0.34 - 23Barium87.9 126 113 175 239 100 58.7 124 46.4 57.5 62.1 580 3,100 47,000 2,000 69 - 133Cadmium0.146 J 0.777 0.0546 J 0.69 0.587 0.0647 J <0.0327 0.573 <0.0333 <0.0339 0.0561 J 3 1.4 20 20 <0.103 - 2.36Chromium18.8 22 9.99 24.9 34.7 24.8 15.7 23.3 29 18 15.7 3.8 0.31 6.5 100 40.3 - 77.5Lead52.4 186 18 164 197 40 6.34 99.9 7.07 7.55 15.1 270 400 800 100 10.2 - 32.3Selenium1.02 0.878 1.01 0.884 0.995 0.872 0.511 0.919 0.782 0.84 1.11 2.1 78 1,200 20 0.753 - 1.35Silver0.0466 J 0.245 J 0.02 J 0.22 J 0.466 0.0728 J 0.0261 J 0.142 J 0.0264 J 0.0211 J 0.0297 J 3.4 78 1,200 100 <0.199 - 12.7SW7199Chromium Hexavalent 0.28 <0.181 <0.178 0.422 0.399 <0.168 0.521 0.333 <0.181 <0.184 <0.185 3.8 0.31 6.5 -<0.328 - <0.3427471AMercury (Total)0.222 J 0.145 J 0.0901 J 1.42 0.496 0.225 <0.0282 0.353 <0.0286 0.0571 J <0.0291 1 2.3 9.7 4 0.0735 - 0.148Notes:All concentrations are reported in mg/kg (milligrams per kilogram).
The Rule of 20 Values are derived from a 1:20 factor of the United States Environmental Protection Agency (USEPA) Toxicity Characteristic Leaching Procedure (TCLP), November 2004, Maximum Concentration of Contaminants for Toxicity Characteristic.NS = No screening level established; - = Not applicableQ = Qualifier; J = Laboratory estimated value below the lowest calibration point/reporting limit; B = Analyte also detected in associated method blankBold = DetectionBold/Highlight = Exceedance of the PSRG or Rule of 20 Value. Underlined = Exceedance of Protection of Groundwater PSRG
6020B
Co. (BF No. 22026-18-060) and Berryhill-Thrift Road (BF No. 21061-17-060) Brownfields properties.
8070E
8060D
--
04/18/23Date Collected 04/19/23 0-2'2-5'5-10'10-17.5'0-2'2-5'Industrial/ Commercial PSRG5-10'0-2'2-5'5-10'04/17/23 Residential PSRG Rule of 20 Value RangeSample ID Protection of Groundwater PSRG10-20'
ONE Page 4 of 5 AP Foundry, LP
Table 2Summary of Soil Analytical DataMill Creek - Foundry and Dynamic Auto Works IICharlotte, North Carolina
Method Analyte Result Q Result Q Result Q Result Q Result Q Result QAcetone0.024 J 0.149 0.053 0.045 0.009 J 0.038 25 14,000 210,000Benzene<0.0008 <0.0008 <0.0008 <0.0007 <0.0007 <0.0007 0.01 1.2 5.4Carbon Disulfide <0.0008 <0.0009 <0.0008 <0.0008 <0.0008 <0.0008 4.1 160 740n-Hexane <0.0009 <0.0009 <0.0009 <0.0008 <0.0008 <0.0008 55 130 540Methyl Ethyl Ketone (MEK)<0.0008 0.005 J 0.003 J <0.0008 <0.0008 <0.0008 17 5,500 40,000Methylene Chloride 0.002 B J <0.001 0.003 B J 0.001 B J 0.001 B J 0.002 B J 0.025 58 650Toluene<0.0009 <0.0009 <0.0009 <0.0008 <0.0008 <0.0008 8.3 990 9,700Anthracene<0.185 <0.193 <0.186 <0.178 <0.175 <0.183 1300 3,600 45,000Benzo(a)anthracene <0.180 <0.188 <0.180 <0.173 <0.170 <0.178 0.35 1.1 21Benzo(a)pyrene <0.190 <0.199 <0.191 <0.183 <0.179 <0.188 0.12 0.11 2.1Benzo(b)fluoranthene 0.206 J <0.197 <0.190 <0.182 <0.178 <0.187 1.2 1.1 21Benzo(ghi)perylene <0.176 <0.184 <0.177 <0.169 <0.166 <0.174 NS NS NSBenzo(k)fluoranthene <0.177 <0.185 <0.178 <0.171 <0.167 <0.175 12 11 210Chrysene<0.184 <0.192 <0.184 <0.177 <0.173 <0.182 36 110 2,100Fluoranthene0.207 J <0.166 <0.160 <0.153 <0.150 <0.157 670 480 6,000Indeno(123-cd)pyrene <0.232 <0.242 <0.233 <0.223 <0.219 <0.229 3.9 1.1 211-Methylnaphthalene <0.137 <0.143 <0.138 <0.132 <0.129 <0.135 0.11 18 732-Methylnaphthalene <0.129 <0.135 <0.130 <0.124 <0.122 <0.128 3.1 48 600Naphthalene<0.187 <0.195 <0.187 <0.179 <0.176 <0.184 0.39 2.1 8.8Phenanthrene<0.270 <0.281 <0.270 <0.259 <0.254 <0.266 NS NS NSPyrene0.181 J <0.181 <0.174 <0.167 <0.164 <0.171 440 360 4,500Arsenic31.01 0.6 0.714 1.04 1.99 5.8 0.68 3 100 0.34 - 23Barium70.4 33.5 82 61.3 87.3 96.9 580 3,100 47,000 2,000 69 - 133Cadmium0.174 J <0.0350 0.0444 J 0.0414 J <0.0317 0.201 J 3 1.4 20 20 <0.103 - 2.36Chromium27.5 10.6 41.8 10.9 14.6 151 3.8 0.31 6.5 100 40.3 - 77.5Lead2326.2 7.58 4.98 12.9 83.2 270 400 800 100 10.2 - 32.3Selenium0.851 0.57 0.834 0.707 0.566 0.621 2.1 78 1,200 20 0.753 - 1.35Silver0.0403 J 0.0173 J 0.0221 J 0.0203 J 0.0181 J 0.112 J 3.4 78 1,200 100 <0.199 - 12.7SW7199Chromium Hexavalent <0.183 <0.191 0.432 <0.176 0.293 1.41 3.8 0.31 6.5 -<0.328 - <0.3427471AMercury (Total)0.07 J 0.215 J 0.0408 J <0.0278 0.0581 J 0.395 1 2.3 9.7 4 0.0735 - 0.148Notes:All concentrations are reported in mg/kg (milligrams per kilogram).
The Rule of 20 Values are derived from a 1:20 factor of the United States Environmental Protection Agency (USEPA) Toxicity Characteristic Leaching Procedure (TCLP), November 2004, Maximum Concentration of Contaminants for Toxicity Characteristic.NS = No screening level established; - = Not applicableQ = Qualifier; J = Laboratory estimated value below the lowest calibration point/reporting limit; B = Analyte also detected in associated method blankBold = DetectionBold/Highlight = Exceedance of the PSRG or Rule of 20 Value. Underlined = Exceedance of Protection of Groundwater PSRG
6020B
No. 22026-18-060) and Berryhill-Thrift Road (BF No. 21061-17-060) Brownfields properties.
--
8070E
Date Collected 04/18/23
8060D
0-2'Residential PSRG Industrial/ Commercial PSRG Rule of 20 Value RangeSample ID SB-1 SB-22-5'5-10'10-20'Protection of Groundwater PSRG
ONE Page 5 of 5 AP Foundry, LP
Table 3
Summary of TCLP Analytical Data
Mill Creek - Foundry and Dynamic Auto Works II
Charlotte, North Carolina
EX-5 EX-8 EX-10 SB-2
2-5' 2-5' 10-20' 0-2' 2-5' 0-2' 2-5'
Method Analyte
Chromium - <0.012 0.295 - - - - <0.012 5.0
Lead 0.041 - -1.14 0.152 0.079 0.124 - 5.0
Notes:
All concentrations are reported in mg/L (milligrams per liter).
- = Not analyzed
Bold = Detection
SW-6010D
Laboratory analytical results were screened against the United States Environmental Protection Agency (USEPA) Toxicity Characteristic Leaching
Procedure (TCLP), November 2004, Maximum Concentration of Contaminants for Toxicity Characteristic.
Result
TCLP Regulatory
Level
EX-6 EX-11Sample ID
ONE Page 1 of 1 AP Foundry, LP
Table 4
Summary of Sub-Slab and Exterior Soil Gas Analytical Data
Mill Creek - Foundry and Dynamic Auto Works II
Charlotte, North Carolina
Method Analyte Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q
1,1,1-Trichloroethane <5.5 <5.5 <5.5 <5.5 <5.5 <5.5 <5.5 <5.5 <5.5 <5.5 <5.5 <5.5 44,000
1,1,2-Trichloroethane <5.5 <5.5 <5.5 <5.5 <5.5 7.1 <5.5 <5.5 <5.5 <5.5 <5.5 <5.5 18
1,1-Dichloroethane <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 770
1,1-Dichloroethene <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 18,000
1,2,4-Trimethylbenzene <4.9 <7.4 <4.9 <7.4 3.4 J 12 <7.4 <7.4 13 4.2 J 6.9 <7.4 5,300
1,3,5-Trimethylbenzene <4.9 <4.9 <4.9 <4.9 <4.9 3.4 J <4.9 <4.9 3.2 J <4.9 <4.9 <4.9 5,300
1,3-Butadiene <2.2 <2.2 <2.2 <2.2 <2.2 <2.2 90 <2.2 8.3 15 3.4 <2.2 41
2,2,4-Trimethylpentane <4.7 <4.7 <4.7 <4.7 <4.7 140 <4.7 <4.7 2.8 J <4.7 <4.7 <4.7 NS
2-Butanone 26 2.4 J 12 14 6.9 13 12 8.4 12 15 15 5.6 440,000
2-Hexanone <4.1 <4.1 <4.1 <4.1 <4.1 16 4.9 <4.1 3.9 J <4.1 3.5 J <4.1 2,600
4-Ethyltoluene <4.9 <4.9 <4.9 <4.9 <4.9 2.9 J <4.9 <4.9 4.2 J <4.9 <4.9 <4.9 NS
4-Methyl-2-pentanone 17 <4.1 18 21 15 10 3.7 J 4.3 42 35 75 2.5 J 260,000
Acetone 260 <24 74 78 28 460 84 29 75 99 49 60 NS
Benzene <3.2 <3.2 <3.2 <3.2 8 13 12 4.3 5.3 3.7 5.4 11 160
Bromodichloromethane <5.2 <6.7 <6.7 <6.7 <6.7 16 <6.7 <6.7 <6.7 <6.7 <6.7 <6.7 33
Carbon disulfide 1.7 J <3.1 3.7 5 3.4 50 32 6.2 38 9.3 23 9.8 61,000
Chlorobenzene <4.6 <4.6 <4.6 <4.6 <4.6 3.0 J <4.6 <4.6 15 <4.6 <4.6 <4.6 4,400
Chloroform <4.9 <4.9 <4.9 <4.9 <4.9 5.4 <4.9 <4.9 <4.9 <4.9 <4.9 <4.9 53
Chloromethane <2.1 <2.1 2.2 2.2 <2.1 1.8 J <2.1 <2.1 <2.1 <2.1 <2.1 <2.1 7,900
cis-1,2-Dichloroethene <4.0 <4.0 <4.0 <4.0 <4.0 260 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 3,500
Cyclohexane 10 <3.4 8.6 8.8 54 130 66 22 260 78 110 65 530,000
Dichlorodifluoromethane <4.9 3.5 J <4.9 <4.9 <4.9 <4.9 <4.9 <4.9 <4.9 <4.9 7.4 3.7 J 8,760
Ethylbenzene <4.3 <4.3 <4.3 <4.3 2.40 J 6.1 3.9 J 3.3 J 140 5 9.1 9.3 490
Isopropyl alcohol 4.9 J <18 <18 5.4 J <18 4.4 J <18 <18 <18 <18 <18 <18 18,000
m,p-Xylene <8.7 <8.7 <8.7 <8.7 5.0 J 13 6.1 J 8.7 970 11 17 34 8,800
Methylene chloride <3.5 <3.5 <3.5 <3.5 <3.5 <3.5 <3.5 <3.5 <3.5 <3.5 <3.5 <3.5 53,000
n-Heptane <4.1 <4.1 <4.1 <4.1 <4.1 33 17 <4.1 6.4 <4.1 3.9 J 3.3 J 35,000
n-Hexane <3.5 <4.1 4.8 <3.5 3.9 110 50 <3.5 20 10 6.9 77 61,000
o-Xylene <4.3 <4.3 <4.3 <4.3 <4.3 5.9 2.8 J 4.1 J 480 4.1 J 5.4 19 8,800
Propene 1.9 <1.7 1.9 2.5 7.6 2,200 1,800 13 200 420 21 3,000 260,000
Styrene <4.3 <4.3 <4.3 <4.3 <4.3 1.7 J <4.3 <4.3 4.0 J <4.3 2.8 J <4.3 88,000
Tetrachloroethene 4,000 29 <6.8 <6.8 18 <6.8 <6.8 <6.8 <6.8 <6.8 <6.8 <6.8 3,500
Tetrahydrofuran 8.4 <2.9 <2.9 <2.9 <2.9 <2.9 <2.9 <2.9 4.4 5.3 4.3 <2.9 180,000
Toluene 6.2 4.1 11 11 27 110 29 49 250 120 180 57 440,000
trans-1,2-Dichloroethene <4.0 <4.0 <4.0 <4.0 <4.0 12 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 3,500
Trichloroethene <5.4 <5.4 21 21 <5.4 660 <5.4 <5.4 <5.4 20 <5.4 <5.4 180
Trichlorofluoromethane <5.6 <5.6 <5.6 3.1 J <5.6 <5.6 <5.6 <5.6 <5.6 <5.6 <5.6 <5.6 NS
Vinyl acetate <3.5 <3.5 <3.5 <3.5 <3.5 <3.5 <3.5 <3.5 <3.5 <3.5 <3.5 <3.5 18,000
Xylenes, Total <13 <13 <13 <13 <13 19 8.9 J 13 J 1,400 15 22 53 8,800
Notes:
All concentrations are re orted in micro rams er cubic meter m3 .
Sub-slab and exterior soil gas screening levels (SGSLs) were obtained from the North Carolina Department of Environmental Quality (NCDEQ) Vapor Intrusion Risk Calculator using the non-residential exposure scenario.
For each sample, a cumulative exceedance exists when the carcinogenic risk exceeds 1.0E-06 or the hazard quotient exceeds 1.0.
Compounds 2,2,4-trimethylpentane and 4-ethyltoluene were not identified in the NCDEQ Vapor Intrusion Risk Calculator and are not included in risk calculations.
NS = No screening level established; NA = Not applicable
Q = Qualifier; J = Laboratory estimated value below the lowest calibration point/reporting limit
Bold = Detection
Bold/Highlight = Exceedance of a regulatory screening level
SG-7
EX-5
Exterior
vacant sho
No
Parking garage
04/19/23
No No NoNo No No No No Yes Yes No
Sub-Slab and Exterior
SGSL
EX-3 EX-4
Stairwell
Cumulative Exceedence
TO-15
Sample ID
Date Collected
SS-1 SS-2 SS-3 DUP-2 SS-4 SG-1 SG-2 SG-3 SG-4 SG-5 SG-6
623 South Cedar Street Grass hillside Dirt drive600 Eldridge
Stree
Asphalt
arkin lo Grass median Asphalt
arkin lo
Elevator
Soil Characterization Zone NA EX-1
Retail RetailSample Location (Future use- 1st floor) Retail Retail Concrete drive Retail
Sample Location (Current use) 623 South Cedar Street
EX-2
ONE Page 1 of 2 AP Foundry, LP
Table 4
Summary of Sub-Slab and Exterior Soil Gas Analytical Data
Mill Creek - Foundry and Dynamic Auto Works II
Charlotte, North Carolina
Method Analyte Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q Result Q
1,1,1-Trichloroethane <5.5 <5.5 <5.5 6.8 <5.5 17 <5.5 <5.5 <5.5 <5.5 <5.5 44,000
1,1,2-Trichloroethane <5.5 <5.5 <5.5 <5.5 <5.5 <5.5 <5.5 <5.5 <5.5 <5.5 <5.5 18
1,1-Dichloroethane <4.0 <4.0 <4.0 <4.0 <4.0 3.2 J <4.0 <4.0 <4.0 <4.0 <4.0 770
1,1-Dichloroethene <4.0 <4.0 <4.0 <4.0 <4.0 6.3 <4.0 <4.0 <4.0 <4.0 <4.0 18,000
1,2,4-Trimethylbenzene 20 <7.4 <7.4 <7.4 <7.4 <7.4 8.8 4.4 J <7.4 3.7 J 3.9 J 5,300
1,3,5-Trimethylbenzene 5.7 <4.9 <4.9 <4.9 <4.9 <4.9 <4.9 <4.9 <4.9 <4.9 <4.9 5,300
1,3-Butadiene 4.8 <2.2 <2.2 <2.2 <2.2 <2.2 110 12 <2.2 <2.2 <2.2 41
2,2,4-Trimethylpentane <4.7 <4.7 <4.7 <4.7 <4.7 <4.7 4.7 <4.7 <4.7 <4.7 <4.7 N/A
2-Butanone 41 3.2 6.5 5.3 12 13 15 13 3.4 28 27 440,000
2-Hexanone <4.1 <4.1 3.5 J <4.1 3.7 J <4.1 4.5 <4.1 <4.1 <4.1 2.7 J 2,600
4-Ethyltoluene 6.6 <4.9 <4.9 <4.9 <4.9 <4.9 3.4 J <4.9 <4.9 <4.9 <4.9 N/A
4-Methyl-2-pentanone 95 <4.1 <4.1 5.1 <4.1 5.5 35 6.6 2.3 J 100 140 260,000
Acetone 210 10 J <24 14 J 44 53 160 80 12 J 150 140 N/A
Benzene 7 <3.2 13 <3.2 2.9 J 3.5 15 5.8 2.6 J 2.4 J <3.2 160
Bromodichloromethane <6.7 <6.7 <6.7 <6.7 <6.7 <6.7 <6.7 <6.7 <6.7 <6.7 <6.7 33
Carbon disulfide 34 2.2 J 6.2 <3.1 6.9 7.2 66 6.2 3.7 9.8 11 61,000
Chlorobenzene <4.6 <4.6 2.8 J <4.6 <4.6 <4.6 <4.6 <4.6 <4.6 <4.6 <4.6 4,400
Chloroform <4.9 <4.9 <4.9 9.8 <4.9 18 <4.9 <4.9 <4.9 <4.9 <4.9 53
Chloromethane <2.1 <2.1 <2.1 <2.1 <2.1 <2.1 <2.1 <2.1 <2.1 <2.1 <2.1 7,900
cis-1,2-Dichloroethene <4.0 <4.0 <4.0 <4.0 <4.0 140 <4.0 <4.0 <4.0 <4.0 <4.0 3,500
Cyclohexane 2.8 J 85 49 16 <3.4 23 240 180 46 52 55 530,000
Dichlorodifluoromethane <4.9 <4.9 <4.9 <4.9 <4.9 <4.9 <4.9 <4.9 <4.9 <4.9 <4.9 8,760
Ethylbenzene 11 4.3 19 <4.3 <4.3 3.0 J 11 5.2 2.6 J 4.1 J 4.8 490
Isopropyl alcohol 21 <18 <18 6.6 J <18 3.6 J 5.0 J 4.2 J 4.2 J 3.3 J <18 18,000
m,p-Xylene 42 3.9 J 41 <8.7 <8.7 5.0 J 20 11 4.6J 10 11 8,800
Methylene chloride <3.5 <3.5 <3.5 <3.5 <3.5 5.6 <3.5 <3.5 <3.5 <3.5 <3.5 53,000
n-Heptane 4.3 <4.1 5.1 <4.1 4.5 <4.1 19 <4.1 <4.1 <4.1 <4.1 35,000
n-Hexane 8.8 <3.5 44 <3.5 11 4.8 63 10 3.2 J 4.1 3.2 J 61,000
o-Xylene 12 <4.3 34 <4.3 <4.3 <4.3 7.8 6.5 4.1 J 3.5 J 3.7 J 8,800
Propene 46 16 440 12 10 41 3,100 170 54 4.7 5.7 260,000
Styrene 2.6 J <4.3 2.1 J <4.3 <4.3 <4.3 2.3 J <4.3 <4.3 <4.3 <4.3 88,000
Tetrachloroethene <6.8 <6.8 28 740 38 2,800 <6.8 <6.8 <6.8 <6.8 <6.8 3,500
Tetrahydrofuran 13 <2.9 <2.9 2.2 J <2.9 <2.9 8.4 4 <2.9 5 4.4 180,000
Toluene 570 37 28 13 6.2 25 440 73 26 110 110 440,000
trans-1,2-Dichloroethene <4.0 <4.0 <4.0 <4.0 <4.0 4.6 <4.0 <4.0 <4.0 <4.0 <4.0 3,500
Trichloroethene <5.4 11 650 520 4.8 J 3,100 <5.4 4.0 J 7 <5.4 <5.4 180
Trichlorofluoromethane <5.6 <5.6 17 <5.6 <5.6 3.9 J <5.6 <5.6 <5.6 <5.6 <5.6 N/A
Vinyl acetate <3.5 <3.5 <3.5 <3.5 <3.5 <3.5 20 <3.5 <3.5 <3.5 <3.5 18,000
Xylenes, Total 54 <13 75 <13 <13 <13 28 18 <13 14 15 8,800
Notes:
All concentrations are reported in micrograms per cubic meter (µg/m3).
Sub-slab and exterior soil gas screening levels (SGSLs) were obtained from the North Carolina Department of Environmental Quality (NCDEQ) Vapor Intrusion Risk Calculator using the non-residential exposure scenario.
For each sample, a cumulative exceedance exists when the carcinogenic risk exceeds 1.0E-06 or the hazard quotient exceeds 1.0.
Compounds 2,2,4-trimethylpentane and 4-ethyltoluene were not identified in the NCDEQ Vapor Intrusion Risk Calculator and are not included in risk calculations.
NS = No screening level established; NA = Not applicable
Q = Qualifier; J = Laboratory estimated value below the lowest calibration point/reporting limit
Bold = Detection
Bold/Highlight = Exceedance of a regulatory screening level
TO-15
Cumulative Exceedence
04/19/23
No NoNoNoYesYesYesYesNoNoNo
SG-14 SG-15 SG-16SG-8Sample ID
Date Collected
Soil Characterization Zone
Sample Location (Future use- 1st floor)
EX-7
SG-17
EX-13
Dirt road
Restaurant/Parking garage Retail/Lobby/Parking garage
DUP-1SG-9 SG-10 SG-11 SG-12 SG-13
Dirt parking
Parking garage
Grass area
EX-8 EX-9 EX-10 EX-11 EX-12
Sub-Slab and Exterior
SGSLSample Location (Current use)
ONE Page 2 of 2 AP Foundry, LP
Table 5Summary of Groundwater Analytical DataMill Creek - Foundry and Dynamic Auto Works II Charlotte, North Carolina
Method Analyte Result Q Result Q Result Q Result Q Result Q Result Q Result QAcetone15.6 <1.80 <1.80 <1.80 <1.80 <1.80 <1.80 6,000 6,000,000Carbon Disulfide <0.150 <0.150 <0.150 <0.150 0.661 J <0.150 <0.150 700 590,000cis-12-Dichloroethene <0.200 0.5 0.489 J 0.362 J 0.518 0.363 J <0.200 70 70,000Methyl Ethyl Ketone (MEK)1.19 J <0.710 <0.710 <0.710 <0.710 <0.710 <0.710 4,000 4,000,000Tetrachloroethene<0.220 <0.220 0.225 J <0.220 <0.220 <0.220 <0.220 0.7 700Toluene<0.220 <0.220 <0.220 <0.220 0.331 J <0.220 <0.220 600 260,000Trichloroethene1.01 71.5 68 83.4 2.63 45.2 <0.180 3 3,000Diethyl phthalate 0.868 J H <0.749 <0.752 <0.752 <0.585 H 6,000 NSDimethyl phthalate 3.81 J H <0.944 <0.948 <0.948 <0.510 H NS NSBarium41.3 21.3 22.1 20.2 90.2 700 700,000Chromium3.74 1.09 1.14 2.12 0.427 J 10 10,000Lead0.561 J <0.264 <0.264 <0.264 0.288 J 15 15,000Selenium0.719 J 1.51 1.48 1.04 <0.703 20 NSSM-3500CrB Chromium Hexavalent <0.0044 <0.0044 <0.0044 <0.0044 <0.0044 NS NSSW-7470A Mercury <0.00013 <0.00013 <0.00013 <0.00013 <0.00013 1 NSNotes:All concentrations are reported in µg/L (micrograms per liter).
NS = No screening level established- = Not analyzedQ = Qualifier; J = Laboratory estimated value below the lowest calibration point/reporting limit; H = Sample analyzed outside of hold timeBold = DetectionBold/Highlight = Exceedance of a regulatory screening level
2L GCLMW-4 IDW-1 Trip Blank
Laboratory analytical results are screened against the North Carolina Department of Environmental Quality (NCDEQ) 15A NCAC 02L .0202 Groundwater Quality Standards (2L) (2022) and Gross Contamination Levels for Groundwater (GLC) (2014).
Sample ID
SW-6020B
MW-1 MW-2 DUP-1 MW-3
SW-8260D
SW-8270E
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ONE Page 1 of 1 AP Foundry, LP

Appendix A Soil Boring Logs

Appendix B Soil Laboratory Analytical Reports

Appendix C Sub-Slab and Soil Gas Laboratory Analytical Report

Appendix D TVS Field Report

Appendix E Risk Calculation Outputs

Appendix F Groundwater Laboratory Analytical Report

Appendix G Manifest