25067_Dynatech MMP Compliance Letter 20221202

December 2, 2022
Sent Via E-mail Mr. Mike Burcham, PE
Geosyntec Consultants of NC, PC 2501 Bue Ridge Rd, Ste 430 Raleigh, NC 27607
[e-mail] Subject: Methane Mitigation System Design Report - Compliance Review
Dynatech III Brownfields Property Charlotte, Mecklenburg County Brownfields Project No. 25067-21-060 Dear Mr. Burcham: The North Carolina Department of Environmental Quality Brownfields Program (DEQ Brownfields) received and reviewed the Methane Mitigation System Design Report, dated November 2022 (MMS). DEQ Brownfields
comments to previous revisions of this MMS were addressed; and we have determined that this MMS is in compliance with the DEQ Brownfields Program NC DEQ Brownfields Program Methane Assessment Protocol (July 2020–Rev. December 2020) and Vapor Intrusion Mitigation System (VIMS) Design Submittal Requirements
Checklist dated March 2022. Consistent with standard brownfields vapor intrusion provisions which will be included in the future brownfields
agreement for this project, an essential component of public health protection for this design is the professional engineer’s seal of these documents that the proposed design will be effective at mitigating the potential for both methane and vapor intrusion at the property and protecting public health. Furthermore, the safe occupancy of the
building will be evaluated upon system effectiveness, sub-slab soil gas sampling, and indoor air sampling (if warranted) as required by Section 4.0: “Post-Construction/Pre-Occupancy System Effectiveness Testing” of the MMS Design. In addition, DEQ Brownfields reserves the authority to require confirmation of efficacy in the future. Please be advised that this approval from DEQ Brownfields 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 704-661-0330, or via e-mail at [e-mail].
Sincerely,
Carolyn Minnich Brownfields Project Manager
cc: BF Property Management Unit Jeff Ahrens, Matthew Jenny of Geosyntec Chris Walker, Alexander Hicks
Mason Ellerber, Abacus Capital