WS-10203_47461_C_NFA_20230220_Signature Flight Support

February 20, 2023

Piedmont Triad Airport Authority
PO box 35005
Greensboro, NC 27425

Re: Notice of No Further Action
15A NCAC 2L .0407(e)
Risk-based Assessment and Corrective Action
for Petroleum Underground Storage Tanks

Signature Flight Support GSO
6427 Bryon Blvd (PTIa)
Greensboro, Guilford County
Incident Number: 47641
Risk Classification: Low

Dear Piedmont Airport:

The UST Section, Division of Waste Management, Winston-Salem Regional review of this incident
indicates that soil contamination exceeds the residential maximum soil contaminant concentrations
(MSCCs) established in Title 15A NCAC 2L .0411 and groundwater contamination meets the cleanup
requirements for a low-risk site but exceeds the groundwater quality standards established in Title 15A
NCAC 2L .0202.

The UST Section determines that no further action is warranted for this incident. All required actions have
been completed. On 2/20/2023, the UST Section received a certified copy of the Notice of Residual
Petroleum which is filed with the Register of Deeds on 2/6/2023 in Book 8699 on pages 2504-2505.

This determination shall apply unless the UST Section later finds that the discharge or release poses an
unacceptable risk or a potentially unacceptable risk to human health or the environment. Pursuant to Title
15A NCAC 2L .0407(a) you have a continuing obligation to notify the Department of Environmental
Quality of any changes that might affect the risk or land use classifications that have been assigned.

Be advised that as groundwater contamination exceeds the groundwater quality standards established in
Title 15A NCAC 2L .0202, groundwater within the area of contamination or within the area where
groundwater contamination is expected to migrate is not suitable for use as a water supply. Be advised that
as soil contamination exceeds the residential MSCCs, the property containing the contamination is suitable
only for industrial/commercial use.

Interested parties may examine the incident file by contacting this regional office and may submit comments
on the site to the regional office at the address or telephone number listed below.

Page 2 of 2

This No Further Action determination applies only to the subject incident; for any other incidents at the
subject site, the responsible party must continue to address contamination as required.

If you have any questions regarding this notice, please contact Scott Ryals at [e-mail] or by
phone at 919-707-8168.

Sincerely,

James W Brown
Winston-Salem Regional Supervisor
UST Section, Division of Waste Management, NCDEQ

Copied under separate letter:
Guilford County Health Director, Dr. Lulia Vann, [e-mail]
Guilford County Manager, Michael Halford, [e-mail]
Gene Mao, GCHD

WS-10203_47461_C_NFA_20230220_Signature Flight Support