NCC233511_ESC Approval Submitted_20231218

DURHAM
COUNTY Engineering and
Q�O Environmental Services
LETTER OF APPROVAL
PROJECT NAME: UT Warp 10 JOB NUMBER: 6725-11
SUBMITTED BY: McAdams 6/27/2023
NEW SUBMITTAL (X) REVISED () ACRES: 10.30
October 19, 2023
United Therapeutics
Corporation
55 TW Alexander Dr
RTP, NC
Dear Sir or Madam:
This office has reviewed the subject Sedimentation and Erosion Control Permit
Application. We find the application to be acceptable and hereby issue this letter of
approval. In accordance with G.S. 131A-61 (bl), this approval is conditioned upon
compliance with federal and State water quality laws, regulations, and rules. If any
stipulations or recommendations are applicable, a list is attached and is incorporated as a
part of this letter of approval.Pursuant to Section 3.8.5 of the Durham City-County Unified
Development Ordinance,plans for which no permit has been issued shall expire one year
from the approval date.
Please be advised that a copy of the approved plan must be on file at the job site, and a land
disturbing permit must be obtained and prominently displayed. Pursuant to G.S. 113A-61
(d) and Section 15.5.1 of the Durham City-County Unified Development Ordinance, you
are hereby notified that the Sedimentation and Erosion Control Office has the right to
inspect the site over the life of the project to insure compliance with the approved plan and
ordinance.
The Sedimentation and Erosion Control Program is performance oriented, requiring
protection of the natural resources and adjoining properties. If following the
commencement of this project it is determined that the sedimentation and erosion control
plan is inadequate to meet the requirements of the Durham City-County Unified
Development Ordinance, this office may require revisions in the plan and its
implementation to insure compliance with the Ordinance.

Pursuant to Section 12.10.6 of the Durham City-County Unified Development Ordinance,
prior to initiating land-disturbing activity, the person conducting such activity must notify
the sedimentation and erosion control office of the date that such activity will begin.
NCG010000 Requirements
As of April 1, 2019, all new construction activities are required to complete and
submit an electronic Notice of Intent(eNOI) form requesting a Certificate of Coverage
(COC) under the NCG010000 Construction General Permit. After the form is
reviewed and found to be complete,you will receive a link with payment instructions
for the applicable annual permit fee. After the fee is processed, you will receive the
COC via email. As the Financially Responsible Party shown on the FRO form
submitted for this project,you MUST obtain the COC prior to commencement of any
land disturbing activity. The eNOI form and fee details may be accessed
at deq.nc.gov/NCG01. Please direct questions about the eNOI form
to the Stormwater Program staff in the Raleigh central office. If the owner/operator
of this project changes in the future, the new responsible party must obtain a
new COC.
It should also be noted that approval of an erosion control plan does not in any way
indicate approval of, or authorization to begin installation of Stormwater
infrastructure without City/County approved Construction Drawings.
We look forward to working with you on this project.
Sincerely,
vilCf_eivl/tCV)/oViA°
McKenzie Bradshaw,
PE
Stormwater Manager
CC: James Eason, McAdams
mg/jm
Rev.10/23

APPLICATION REVIEW COMMENTS
Project Name: UT Warp 10 Job Number: 6725-11
Reviewed By: McKenzie Bradshaw Approved (X)
1. Submit a Land Disturbing Permit fee in the amount of $8,240.00.
2. Provide written approval for land disturbance from the Durham City-County
Planning Department in the form of an approved site plan, Zoning Compliance
Checkoff, or other written approval to this office.
3. Upon installation of the tree protection fencing, submit a Tree Protection Fence
Certification Form and call this office for an inspection at(919) 560- 0735.
4. Submit a surety in the amount of$41,200.00.
Please note,we no longer accept Cash sureties. See our web site for appropriate
Performance Bond or Letter of Credit forms.
Forms may be obtained from this office or from the Durham County Engineering website
at: http://dconc.gov/home.
Also available at the County website is a link to NCDEQ where information pertaining to the state
mandated Self Inspection Program and related forms can be downloaded. Please remember to
maintain your records!
NPDES:
Since this project will disturb one or more acres, stormwater runoff must be permitted pursuant to
the National Pollutant Discharge Elimination System(NPDES) administered in North Carolina by
the Division of Energy Mineral and Land Resources(DEMLR).You are responsible for complying
with the General Permit requirements and are subject to enforcement by DEMLR for any violations
of the General Permit. Enclosed is a copy of the General Stormwater Discharge Permit for
Construction Activities, NCG010000 covering your activity. The Permit will be considered valid
as long as your submitted plan meets the requirements of NCG010000. Further information
regarding the General Construction Permit introduced in August, 2011 can be obtained at:
http://portal.ncdenr.org/web/wq/ws/su/construction.