20050732 Ver 09_More Info Received_20081208

Briar Chapel - Phase 5 South (Chatham County, NC - DWQ Project #...
Subject: Briar Chapel - Phase 5 South (Chatham County, NC - DWQ Project #05-0732v9) - Stormwater Management
Plan Modification Request
From: "Finch, Jeremy" <[e-mail]>
Date: Mon, 8 Dec 2008 15:19:23 -0500
To: "Annette Lucas" <[e-mail]>
Annette -
Per our conversation this morning and your request, please find the attached pdf file containing a letter
summarizing the Briar Chapel Phase 5 South DWQ submittals/modifications to date. I hope this helps bring some
clarity to an already confusing permitting situation.
Thanks for all your help on this. I really appreciate it.
Let me know if you need anything else.
Take care.
Jeremy Finch, PE
Project Manager
Office: 919-287-4262
Cell: 919-624-3672
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EcoEngineering
;k JiN -bon of `'ire John lk? F.4fcAdjin, C'rFmpa ?}, Ire,
P.O. Box 14005, Research Triangle Park, NC 27709
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Please consider the environment before you print this e-mail.
2008-12-08 - LTR to A.
Lucas-
Content-Description: StormwaterPerniitMod
2008-12-08 - LTR to A. Lucas- StormwaterPermitMod - sent.pdf- sent.pdf
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1 of 1 12/17/2008 12:33 PM
EcoEngineering
A division of The John R. McAdams Company, Inc.
December 8, 2008
Ms. Annette Lucas
NC Division of Water Quality
2321 Crabtree Boulevard, Suite 250
Raleigh, North Carolina 27604
Re: Briar Chapel Community Phase 5 South - Chatham County, NC
NEW-06030
Stormwater Management Plan Modification Request:
DWQ Project # 05-07320
Dear Ms. Lucas:
On behalf of Newland Communities, we are requesting a modification to the
existing Stormwater Management Plan Approval (see DWQ project number
referenced above) for Phase 5 South of the Briar Chapel Community that was
approved as part of the 401 Water Quality Certification. The project is
located off US Highway 15-501, north of Andrews Store Road and south of
Mann's Chapel Road in Chatham County, North Carolina.
APPROVED DESIGN
The proposed development is located within the Cape Fear River Basin, and
drains to streams (Pokeberry Creek & Wilkinson Creek) classified as Water
Supply IV (WS-IV), and Nutrient Sensitive Waters (NSW). As a result of the
proposed development exceeding the maximum allowable limit for
stream/wetlands impacts, an individual permit was issued by The United
States Army Corps of Engineers (USACE). Also, a Clean Water Act Section
401 Water Quality Certification from NCDWQ was issued with the individual
permit. Under the 401 Water Quality Certification from NCDWQ, Newland
Communities was required to submit final stormwater management plans that
utilized constructed wetlands, bioretention areas, wet ponds followed by
forested filter strips and similar best management practices designed to
remove at least 85% TSS.
Research Triangle Park, NC
Post Office Sox 14005
Research Triangle Park,
North Carolina 27709
2905 Meridian Parkway
Durham, North Carolina 27713
800.733-5646
919-287-4262
919-361-2269 fax
To address the 401 Water Quality Certification stormwater requirements for
Phase 5 South of Briar Chapel, final stormwater management plans and
calculations for 1 wet pond with a preformed scour hole/level spreader outlet
that provided sheet flow of the 1" runoff volume into the existing vegetated
stream buffer (which serves as the vegetated filter strip) was originally
submitted to and approved by NCDWQ in June 2008.
In November 2008, revisions were made to the overall Phase 5 South site
layout that resulted in changes to both the total drainage area and total
www.ecoeiig(.com I Design Services Focused On Client Success
[JEcoEngineering
A division of The John R. McAdams Company, Inc.
Ms. Annette Lucas
NC Division of Water Quality
December 8, 2008
Page 2
impervious area to the June 2008 wet pond approval. As a result, a courtesy
notification (along with the revised site layout attached) was provided to the
DWQ detailing both drainage area and impervious area changes to the June
2008 wet pond approval. The courtesy notification did not propose any
structural changes to the June 2008 wet pond approval for Phase 5 South.
PROPOSED REVISIONS
Rather than construct the entire approximately 22-acre Phase 5 South at one
time, the owner has decided to divide the construction into two parts: Phase 5
South `A' and Phase 5 South `B'. Phase 5 South `A' will be the initial stage
of construction involving approximately 9.8-acres and will consist of 28
single-family residential lots, along with the associated utility and roadway
infrastructure (see Site Plan for more detail). Phase 5 South `B' will be
constructed sometime in the future (potentially several years) and will involve
the construction of the remaining portions of the overall Phase 5 South.
The wet pond approved in June 2008 designed to treat the entire 22-acre
Phase 5 South area will be constructed in the future as part of Phase 5 South
`B'. This has resulted in the requirement that a temporary stormwater best
management practice be constructed for the time being to serve as water
quality treatment for Phase 5 South `A' until the wet pond approved in June
2008 is constructed sometime in the future as part of Phase 5 South `B'. Once
construction of Phase 5 South `B' including the previously permitted wet
pond is complete, the temporary stormwater best management practice serving
Phase 5 South `A' will be removed.
Consideration of this project is greatly appreciated. If you should have any
questions or require additional information, please do not hesitate to contact
me at [phone].
Sincerely,
THE JOHN R. McADAMS COMPANY, INC.
Jeremy Finch, PE
Project Manager
Stormwater and Environmental Department