25054-Mt Gilead-Post-Occupancy Monitoring Report-Response-20240419

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
MICHAEL SCOTT
Director
Sent Via E-mail
Mr. Cooper T. James
Mt. Gilead DG, LLC
P.O. Box 10325
Greensboro, NC 27404
[e-mail]
NORTH CAROLINA
Environmental Quality
April 19, 2024
Subject: Vapor Intrusion Mitigation System Post -Occupancy Monitoring Report
Mt. Gilead Cotton Oil Co. Brownfields Property
299 Industry Ave.
Mt. Gilead, Montgomery County, North Carolina
Brownfields Project No. 25054-21-062
Dear Mr. James:
The North Carolina Department of Environmental Quality (DEQ) Brownfields Redevelopment
Section (BRS) has received and reviewed the Vapor Intrusion Mitigation System Post -Occupancy
Monitoring Report dated March 19, 2024 (Report) submitted on your behalf by Hanley
Environmental Engineering & Consulting, PLLC for the above referenced Brownfields
Property. The Report summarized sub -slab soil gas assessment activities performed as required
by the response letter from DEQ dated February 8, 2024, that was issued in response to the VIMS
Post -Occupancy Monitoring Report dated May 22, 2023.
Review of the data presented in the report suggests that the concentrations of contaminants
detected beneath the slab are consistent with data from 2022 indicating. In addition, results of the
risk calculations do not exceed acceptable risk thresholds.
The Report concludes with the request to cease sampling, given the stabilization of the contaminant
concentrations observed and the results of the cumulative risk evaluation. DEQ BRS concurs with
the recommendations as proposed in the Report and the post -occupancy monitoring conditions of
the Vapor Intrusion Mitigation System Design Report — Revision 2 dated June 29, 2022 have been
met. No additional post -occupancy sampling will be required at this time. Please be advised that
D E Q�� North Carolina Department of Environmental Quality I Division of Waste Management
217 West Jones Street 1 1646 Mail Service Center I Raleigh, North Carolina 27699-1646
NORTH CAROLINA -
Dewrtmemm W—menmi auai\ 919.707.8200

DEQ reserves the ability to require confirmation of efficacy of vapor mitigation systems to ensure
the protection of public health. Annual Land Use Restriction Update certifications required by
13.p. of the Notice of Brownfields Property should continue to be submitted and include
information about the status of the vapor mitigation system.
If you have any questions, please feel free to contact me at 910-796-7408, or via e-mail
at [e-mail].
Sincerely,
Samuel P. Watson
Project Manager
Brownfields Property Management Branch
ec: David Hanley, Hanley Environmental
Chad McClary, Emerald Inc.
Joselyn Harriger, DEQ BRS
NORTH CAROLINAD_E QI__A
Aj
Oepamnam or Eimmamamai Quail
North Carolina Department of Environmental Quality I Division of Waste Management
217 West Jones Street 1 1646 Mail Service Center I Raleigh, North Carolina 27699-1646
919.707.8200