22008_CLT Aircraft_VIMP Compliance letter Bldg 3456789_20240215

February 15, 2024 Sent Via E-mail

Michael S. Byron Pedcor Investments 770 Third Avenue, S.W. Carmel, IN 46032
[e-mail]
Subject: Vapor Mitigation Compliance Review Hub on Harris -Buildings 3,4,5,6,7,8, and 9 Charlotte Aircraft Brownfields Property
Charlotte, Mecklenburg County
Brownfields Project No. 22008-18-060 Dear Mr. Byron
The North Carolina Department of Environmental Quality (DEQ) Brownfields Redevelopment Section (BRS) received and reviewed the VIMS Installation Report and Request for Occupancy- Hub On Harris Buildings 3,4,5,6,7,8, and 9 (Report) dated December 22, 2023 submitted on your behalf by Mr. Robert Foster of WSP USA Environment & Infrastructure Inc. This Report was submitted for apartment buildings 3,4,5,6,7,8 and 9 only at the Charlotte Aircraft Brownfields Property located at 7705 E W.T.
Harris Boulevard. BRS understands these structures have been constructed in accordance with the approved Vapor Intrusion Mitigation System Design dated November 5, 2020 (VIMS) prepared by Wood Environmental & Infrastructure Solutions, Inc. BRS reviewed the analytical data provided in the Report and evaluated all detections within the soil gas
and indoor air samples using the DEQ Risk Calculator (February 2024 version). A separate risk calculator was completed for each building 3,4,5,6,7,8 and 9. For soil gas beneath the building slab, the results of the risk calculator evaluation were below the DEQ thresholds for non-residential use. In building 3, indoor air samples were collected and the indoor air cumulative risk exceeded the DEQ
thresholds for residential use. In instances where soil gas concentrations pass the risk evaluation and indoor air does not, a common cause can result from a non-specific ambient air source and/or indoor air interferences from general household items such as cleaning products, building materials, etc. Based on a review of the Safety Data Sheets (SDS) for products currently present within the building, as well as an evaluation the detections within the ambient/background air, and soil gas concentrations, BRS
considers that the lines of evidence point to interference from an indoor air source or a non-specific
Mr. Michael Byron February 15, 2024Page 2
ambient air source and not as a result of vapor intrusion. The results of this modified risk evaluation
approach using the DEQ Risk Calculator for building 3 were below the DEQ thresholds for residential use.
Therefore, based on the available data, BRS has determined that the above referenced area is currently
in compliance with Land Use Restriction 15.f of the Notice of Brownfields Property. For the
aforementioned buildings, BRS anticipates semi-annual submittal of post construction monitoring as outlined in the VIMS. In addition, BRS reserves the authority to require confirmation of efficacy in the future.
Please be advised that this compliance review from BRS does not waive any applicable requirement to
obtain any necessary permits, licenses or certifications which may be required from other state or local entities. If you have any questions, please feel free to contact me at [phone], or via e-mail at [e-mail]. Sincerely,
Carolyn F Minnich Project Manager
ec: BFPropertyManagement [e-mail] Foster, Rob [e-mail]