20050732 Ver 31_Approval Letter_20150713

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NCDENR
Noilh Carolina Departrnent of Environment and Natural Resources
Pat McCrory Donand R. van der Vaail
Governor Secretary
July 13, 2015
Chatham County
Mr. Bill Mumford, Assistant Vice President
16 Windy Knoll Circle
Chapel Hill, NC 27516
Subject: APPROVAL OF STORMWATER PLAN
Briar, Chapel — Boulder Point Dr. Extension
Dear Mr, Mumford:
On January 11, 2008, the Division of Water Resources (WY,,'R) issued a revised 401 llater Qua i
Certification to temporarily impact 339 linear feet of stream and 0.157 acre of 404 wetlands
and to permanently impact 1,666 linear feet • stream and 0.159 acre of 404 wetland in order
to construct the Briar Chapel Subdivision in Chatham County.
In order to meet Condition 10 of the 401 Certification for this project, a stormwater
management plan (SMP) for the Briar Chapel — Boulder Point Dr. Extension dated April 17, 2015
was received on April 24, 2015. This approval is for the purpose and design that you described
in your application. If you change your project, you must notify us and you may be required to
send us a new SMP. This approval requires you to follow the conditions listed in the Water
Quality Certification for the project and the additional conditions listed below:
The SMP approved by the DWR consists of a bioretention cell #20 and includes all
associated stormwater conveyances, inlet and outlet structures, and the grading and
drainage patterns depicted on plan sheets dated April 17, 2015, including modification�
BMP 20 Drainage Area Map received July 8, 2015, The plans and specifications for the
Boulder Point Dr. Extension are incorporated • reference into this approval and are
enforceable by DWR provided however that any modification of the design for the
stormwater management system that is accepted by DWR shall take precedence over
the original plans and specifications.
2. The maximum allowable drainage and the maximum impervious areas for the
bioretent�ion cell shall be those provided in the "401 Narrative & Supporting Calculations
— Briar Chapel Development —Boulder Point Dr. Extension" dated April 17, 2015
Division of Water Resources — 401 & Buffer Permitting Unit
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: 919 - 807 -63001 FAX: 919.,807-6494
internet: www.ncwaterquality.org

NNP — Briar Chapel LLC
DWR Project #05-0732 V31
Stormwater Plan Approval
Page 2 of 2
(including revisions received July 8, 2015), Any changes to these maximum areas shall
require the applicant to submit a revised stormwater management plan to be approved
by the DWR,
3. Runoff from the 0.45 acres of impervious area of the road segment in the 3.6 acre
drainage area shown • the July 8, 2015 map will be discharged to a scour hole
designed according to the April 17, 2015 plans. Stormwater runoff from any further
development in this 3.6 acreage will need to • treated according • state or local
requirements in place at the time • development.
4. The footprint of all stormwater management devices as well as an additional 10-foot
wide area on all sides of the devices shall be located in public rights-of-way, dedicated
common areas or recorded easement areas. The final plats for the project showing all
such rights-of-way, common areas and easement areas shall be in accordance with the
approved plans.
5. Maintenance activities for the bioretention cell and related stormwater devices shall be
performed in accordance with the notarized O&M agreement signed by Laurie Ford
(Vice President, Operations) on April 20, 2015. The O&M agreement must transfer with
the sale of the land or transfer of ownership/responsibility for the BMP facility, DWR
must be notified promptly of every transfer.
The applicant and/or authorized agent shall provide a completed Certificate of Completion
form to the DWR within thirty (30) days of project completion (available at
h1tp1J.p,grtal,ncdenr, fg/
LsL I.Z�ertsandpermits/aQLly
JLo Lm s).
Thank you for your attention to this matter. If you have any questions or wish to discuss these
matters further, please contact Boyd DeVane at [phone],
Sincerely,
Karen Higgins, Supervisor
401 and Buffer Permitting Unit
cc: DWR Raleigh Regional Office (Qherrj.Sm�th2E� go
L _y)
Chatham County Public Works Dept., P.O.Box 1550, Pittsboro, NC 27312
Gareth Avant i rn creed. co m)
401
♦ Buffer • Permitting Unit File