NCG190050_Tier Relief_20211025

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
BRIAN WRENN
Director
United States Coast Guard SFO Fort Macon
Attn: Todd Ogle, Civilian
2301 East Fort Macon Road
Atlantic Beach, NC 28512
NORTH CAROLINA
Environmental Quality
October 25, 2021
Subject: NPDES Stormwater Permit No. NCG190050
Tier 2 and Tier 3 Status Request
Fort Macon Coast Guard Station Atlantic Beach
Carteret County
Dear Mr. Ogle:
The Wilmington Regional Office staff of the Division of Energy, Mineral, and Land Resources has reviewed your
request for determination that Tier 2 and Tier 3 status be relieved for all outfalls for the Copper, Aluminum, and
Zinc benchmark parameters. Based on review of the sampling data 2017-2021, we are approving this request.
This office cannot establish a new benchmark. You must contact this office if you exceed the average value for
any parameter for the last five years. This approval is effective with the next sampling event. However, this
approval is contingent on the following requirements:
(1) The benchmarks for the parameters are: Aluminum = 0.24 mg/L; Zinc = 0.095 mg/L; Copper = 0.006
mg/L.
(2) The average values in the last five years of the samples over the last five years is: Aluminum = 0.332
mg/L; Zinc = 0.075133 mg/L; Copper = 0.02266 mg/L
(3) The maximum values in the last five years for the parameters are: Aluminum = 0.653 mg/L; Zinc = 0.0418
mg/L; Copper = 0.0399 mg/L.
(4) Zinc does not currently need relief of Tier exceedances and the standard benchmark should be followed.
Please append this letter to your Stormwater Pollution Prevention Plan or permit to document that relief status
has been approved. If changes in drainage areas, structures, processes, storage practices, or other activities
occur that significantly alter the basis of this approval, relief status may no longer be valid. You should either
resume sampling at all storm water discharge outfalls, or reapply to this office for relief status based on updated
information.
If you have any questions or concerns concerning this letter and the attached report, please contact Dan Sams
or me at [phone].
Sincerely,
Brian fambe
Brian Lambe
Environmental Specialist
Land Quality Section
cc: WiRO Files — Land Quality
D E Q�� North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
Wilmington Regional Office 1 127 Cardinal Drive Extension I Wilmington, North Carolina 28405
NORTH CAROLINA -
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