20050732 Ver 09_Stormwater Info_20100112

LI'EcoEn I
gineering
A division of The John R. McAdams Company, Inc.
u5 - o 'l 3 Q- U °I
LETTER OF TRANSMITTAL
To: Ms. Annette Lucas
North Carolina Division of Water Qualit
2321 Crabtree Boulevard, Suite 250
Raleigh, North Carolina 27604
[phone]
Re: Briar Chaoel - Phase 5 South
I am sending you the following item(s):
Date: January 11, 2010
REGULAR MAIL
Job No.: NEW-09007
COPIES DATE NO. DESCRIPTION
1 SWMP Courtesy Notification Letter
1 Revised PH 5 South Master Impervious Area Summa
1 Revised WQ Pond #9 Drainage Area Ma

These are transmitted as checked below:

As requested
For approval
For review and comment
? For your use

Remarks: Annette - Attached are hard copies of the information associated with a courtesy notification
to DWQ of site layout revisions that will affect the existing Stormwater Management Plan Approval
(DWQ Project # 05-0732v9) for Phase 5 South of the Briar Chapel development in Chatham County, NC
Please call if you have any questions.
Copy to:
Signed:
FOR INTERNAL USE ONLY
® Copy Letter of Transmittal Only to File
? Copy Entire Document to File
2905 Meridian Parkway, Durham, North Carolina 27713
PO Box 14005, RTP, North Carolina 27709
Finch, PE
P-- ?I
JAN
DE.NR - W.4fER DUALITY
w[TW40 ANDETOR':,r'r ;TER BRANCH
EcolEngineering
A division of The John R. McAdams Company, Inc.
December 11, 2009
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-091107
Courtesy Notification of Site Design Revisions Affecting Approved
Stormwater Management Plan
DWQ Project # 05-0732v9
Dear Ms. Lucas:
On behalf of Newland Communities, we are providing courtesy notification of
site design revisions that affect the DWQ approved Stormwater Management
Plan (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. As stipulated in the existing Stormwater Management Plan
Approval for Phase 5 South, "the structural stormwater practices as approved
by DWQ as well as drainage patterns must be maintained in perpetuity ". As
a result, courtesy notification is being given to the DWQ of site design
revisions in Phase 5 South that affect the total drainage area and total
impervious area treated by the wet pond BMP. However, there are no
structural modifications to the previously approved wet pond required as part
of this courtesy notification, as it is demonstrated in this courtesy notification
that the revisions do not result in the originally approved wet pond BMP
design drainage area and impervious area being exceeded. Finally, also as a
result of these site design changes, there is an increase in the total amount of
bypass untreated impervious area.
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
Research Triangle Park, NC States Army Corps of Engineers (USACE). Also, a Clean Water Act Section
Post Office Box 14005 401 Water Quality Certification from NCDWQ was issued with the individual
Research mangle Park permit. Under the 401 Water Quality Certification from NCDWQ, Newland
North Carolina 2?709 Communities was required to submit final stormwater management plans that
2905 Meridian Parkcray utilized constructed wetlands, bioretention areas, wet ponds followed by
Ourham Mirth Carolina 71113
800-133 5646
919-28i 426?
919 361 2269 Fax
r»~!i•r-ecoen9fcom Design Services Focused On Client Success
EcoEngineering
A division of The John R. McAdams Company, Inc.
Ms. Annette Lucas
NC Division of Water Quality
December 11, 2009
Page 2
forested filter strips and similar best management practices designed to
remove at least 85% TSS.
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
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 MODIFICATIONS
Due to site design revisions, the total drainage area and total impervious area
to wet pond #9, as well as the total amount of bypass untreated impervious
area are affected. Listed below are the detailed effects of the site design
revisions to the previously approved stormwater management plan for Phase 5
South of Briar Chapel:
Original June 2008 DWO Stormwater Management Plan Approval
• Wet Pond #9 Total Drainage Area = 708,956 SF
• Wet Pond #9 Total Impervious Area = 288,956 SF
• Total Phase 5 South Bypass Untreated Impervious = 50,025
November 2008 DWO Courtesy Notification
• Wet Pond #9 Total Drainage Area = 681,714 SF
• Wet Pond #9 Total Impervious Area = 278,818 SF
• Total Phase 5 South Bypass Untreated Impervious = 52,000 SF
December 2009 DWO Courtesy Notification
• Wet Pond #9 Total Drainage Area = 671,586 SF
• Wet Pond #9 Total Impervious Area = 272,818 SF
EcoEngineering
A division of The John R. McAdams Company, Inc.
Ms. Annette Lucas
NC Division of Water Quality
December 11, 2009
Page 3
• Total Phase 5 South Bypass Untreated Impervious = 58,000 SF
This courtesy notification does not propose any structural changes to the
previously approved design for wet pond #9 in Phase 5 South. For your
convenience, enclosed is a revised drainage area exhibit for wet pond #9,
along with a revised DWQ Attachment `A' for Phase 5 South reflecting these
site design revisions.
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. M AMS COMPANY, INC.
'V.
V Jeremy Finch, PE
Project Manager
EcoEngineering
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SCALE: 1 „_100'
4w A ,T01NER ; DATE:
71- 12-11-2009
~r SHEET NO.
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