20000846 Ver 5_More Info Requested_20190111

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Director
Piedmont Triad Airport Authority
Attn: Mr. Alex Rosser
1000A Ted Johnson Parkway
Greensboro NC 27409
NORTH CAROLINA
Environmental Quafiry
January 11, 2019
D W R # 20000846 v5
Guilford County
Subject: REQUEST FOR ADDITIONAL INFORMATION
PTI — Stormwater Management Plan Modification — Removal of Basin B4 -A
Dear Mr. Rosser:
On December 11, 2018, the Division of Water Resources — Water Quality Programs (Division)
received your request to modify the Stormwater Management Plan (SMP) approved under 401
Individual. Certification # WQC003428. The Division has determined that your application is
incomplete and cannot be processed. The application is on -hold until all of the following
information is received:
1. Please provide a detailed overall drawing that clearly shows the location of Basin B4 -A
within the airport facility.
2. Provide a detailed analysis of all existing stormwater currently directed to Basin B4 -A
and include clear description of stormwater sources and how they are conveyed to the
basin. This should include a description/discussion of all potential pollutants to be
present within the existing stormwater.
3. Please provide a drawing that shows any NPDES outfall sampling points that are
currently tributary to this basin or below the outfall of this basin. For any such locations
please provide all sampling results for each location for the last year.
4. Please clarify if this basin is addressed within your Individual NPDES stormwater permit.
If so, please provide documentation from the Division of Energy, Mineral and Land
Resources (DEMLR) that removal of this basin would be allowed under the NPDES
program.
5. Please provide a detailed analysis of all proposed stormwater drainage areas and
conveyance methods for the proposed grading once Basin B4 -A is removed, including
delineation of the receiving vegetated areas, stormwater discharge volume and velocity.
D_EQ.�) North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
919.707.9000

Piedmont Triad Airport Authority
DWR# 20000846 v5
Request for Additional Information
Page 2 of 2
For any new impervious surfaces please provide an analysis of the potential for
pollutants to be present within the stormwater (de-icing activities is of particular
concern).
6. Provide a detailed analysis to show that after removal of Basin 134-A all stormwater will
meet the criteria outlined Part E-4 (Airports) and Part C-10 (Disconnected Impervious
Surface) of the Stormwater Design Manual.
Once the Division has received this information we will contact you to schedule an on-site
meeting and site visit.
Pursuant to Title 15A NCAC 02H .0502(e), the applicant shall furnish all of the above requested
information for the proper consideration of the application. Please respond in writing within 30
calendar days of receipt of this letter by sending one (1) copy of all of the above requested
information to the 401 & Buffer Permitting Branch, 1617 Mail Service Center, Raleigh, NC
27699-1617 OR by submitting all of the above requested information through this
link: https://edocs.deg.nc.gov/Forms/Supplemental-Information-Form (note the DWR#
requested on the link is referenced above).
If all of the requested information is not received within 30 calendar days of receipt of this
letter, the Division will be unable to approve the application and it will be returned. The return
of this project will necessitate reapplication to the Division for approval, including a complete
application package and the appropriate fee.
Please be aware that you have no authorization under the Water Quality Certification Rules for
this activity and any work done within waters of the state may be a violation of North Carolina
General Statutes and Administrative Code.
Contact Sue Homewood at 336-776-9693 or [e-mail] if you have any
questions or concerns.
Sincerely,
Karen Higgins, Superviso
401 & Buffer Permitting Branch
cc: Richard Darling, Michael Baker International (via email)
DWR WSRO 401 files
DWR 401 & Buffer Permitting Unit
Filename: 20000846v5PTl(Guilford)_SMP MOD—HOLD