NCGNE1454_Approval Letter_20210426

ROB' COO PEP,
Governor
DIONNE DELLFGATTI
Secretary
BPJAN tJ RENN
DFrecior
United Therapeutics Corporation
Attn: Ryan Peterson
55 T.W. Alexander Drive
Durham, NC 27709
Dear Ryan Peterson:
NORTH CAROLINA
Environmental Quality
April 26, 2021
Subject: No Exposure Certification NCGNE1454
United Therapeutics Corporation
Durham County
The Division of Energy, Mineral and Land Resources (DEMLR) has reviewed your submittal of the No
Exposure Certification for Exclusion from NPDES Stormwater Permitting form. Based on your submittal
and signed certification of no exposure at the above referenced facility as well as observations made
during a site visit conducted by Thad Valentine with the Raleigh Regional Office on 4/23/2021, the
Division is granting your conditional exclusion from permitting as provided for under 40 CFR 122.26(g),
which is incorporated by reference in North Carolina regulations.
PIease note that by our acceptance of your No Exposure Certification, you are obligated to maintain no
exposure conditions at your facility. If conditions change such that your facility can no longer qualify for
the No Exposure Certification, you are obligated to immediately obtain NPDES permit coverage for your
stormwater discharge. Otherwise, the discharge becomes subject to enforcement as an un-permitted
discharge. You must self -re -certify annually that the No Exposure conditions are being met by completing
the Annual Self Re -Certification Form, which can be found at https://deq.nc.gov/about/divisions/energy-
mineraI-land-resources/npdes-no-exposure. The completed form does not need to be submitted but shall
be kept onsite and made available upon request.
Your conditional exclusion from permitting does not affect your facility's legal requirements to obtain
environmental permits that may be required under other federal, state, or local regulations or ordinances.
If you have any questions or need further information, please contact Thad Valentine at 919-791-4200.
ncerely,
for Brian Wrenn, Director
Division of Energy, Mineral and Land Resources
cc: Raleigh Regional Office / T. Valentine
North Carolina Department of Environmental Quality Division of Energy, Mineral and Land Resources
512 North Salisbury Street f 1612 Mail Service Center i Raleigh, North Carolina 27699-1612
was nno an�+wm�m, �/'f 919.7079200