20050732 Ver 25_Stormwater Approval_20120114

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NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Pat McCrory Charles Wakild, P. E. John E. Skvarla, III
Governor Director Secretary
January 14, 2013
DWQ Project # 05- 0732v25
Chatham County
Mr. Bill Mumford, Assistant Vice President
NNP — Briar Chapel LLC
16 Windy Knoll Circle
Chapel Hill, NC 27516
Subject Property: Briar Chapel, Great Ridge Parkway Extension
APPROVAL OF MODIFIED STORMWATER PLAN
Dear Mr. Mumford:
On January 11, 2008, the Division of Water Quality (DWQ) issued a revised 401 Water Quality
Certification to temporarily impact 339 linear feet of stream and 0.157 acre of 404 wetlands and
to permanently impact 1,666 linear feet of 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 for Briar Chapel — Great Ridge Parkway Extension, dated December 18, 2012, was
received on December 20, 2012.
The DWQ approves the SMP as satisfying Condition 10 of the General Water Quality
Certification. 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 to you follow the conditions listed in the General Water Quality
Certification for the project and the following additional conditions listed below:
The SMP approved by the DWQ consists of one (1) wet detention pond and one (1)
Level Spreader- Engineered Filter Strip and all associated stormwater conveyances, inlet
and outlet strictures, and the grading and drainage patterns depicted on plan sheets
dated December 19, 2012. The plans and specifications for the Great Ridge Parkway
Extension approved by DWQ are incorporated by reference into this approval and are
enforceable by DWQ provided however that any modification of the design for the
stormwater management system that is accepted by DWQ shall take precedence over
the original plans and specifications.
Wetlands, Buffers, Stormwate- - Compliance and Perrnit!:ng (Oebsca,,e) Urn1 One
1650 Mail Service Canter, Raleigh Nc7n Cirolwa 77699 1;1,0 One
L hone n 1,12 -8 N Salisbury St Raleigh, Nodh 1.0 o rn 27004 Natffrallm
Phone 919 -80T -63001 FAX 919 - 807.6494 I l,�,tnmer 4ew,Ce 1- 977 323 -^748
Interne' t ww nmate��,ualny erg

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Briar Chapel, Great Ridge Park*ay Extension
( Page 2 of 2
January 14, 2013
2. The maximum allowable drainage area for the approved wet detention pond shall be
1,705,452 square feet and the maximum allowable built -upon area within that drainage
area shall be 1,117,211 square feet. The maximum allowable drainage area for the
Level Spreader- Engineered Filter Strip shall be 147,452 square feet and the maximum
allowable built -upon area within that drainage area shall be 62,438 square feet. Built -
upon area includes, but is not limited to, roofed structures, asphalt, concrete, gravel,
brick, slate, coquina and parking areas, but does not include raised, uncovered open slat
decking or the water surface of swimming pools. Any changes to these maximum areas
shall require the applicant to submit and receive approval for a revised stormwater
management plan by the DWQ.
3. 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.
4. Maintenance activities for the wet detention pond shall be performed in accordance with
the notarized O &M agreements signed by Kevin Graham (Vice President, Operations)
on December 13, 2012. The O &M agreement must transfer with the sale of the land or
transfer of ownership /responsibility for the BMP facility. DWQ must be notified promptly
of every transfer.
5. The applicant and /or authorized agent shall provide a completed Certificate of
Completion form to the DWQ within thirty (30) days of project completion (available at
http: / /Portal.ncdenr.orc /web /wq /swp /ws /401 /certsandpermits /applyfforms).
Thank you for your attention to this matter. If you have any questions or wish to discuss these
matters further, please do not hesitate to contact me at (919) 807 -6381.
Sincerely,
y�
Annette Lucas, P.E.
Wetlands, Buffers and Stormwater Compliance and
Permitting (Webscape) Unit
AML/aml
Cc: Becky Fox, EPA
USACE, Raleigh
DWQ Raleigh Regional Office
Chatham County Public Works Dept., P.O. Box 1550, Pittsboro, NC 27312
File Copy
Filename: 050732v25GreatRidgeParkwayExt (Chatham)_SW_Mod_Appmve.docx