20080420 Ver 1_More Info Received_20080507

vss
31825673
May 5, 2008
Ms. Cyndi Karoly
401 Oversight/Express Permitting Unit
NC Division of Water Quality
1650 Mail Service Center
Raleigh, North Carolina 27699-1650
Re: Wynne Creek
DWQ Project # 08-0420
USACE Action ID No.:
Dear Ms. Karoly:
SAW-2007-02757
Thank you for your recent review of the PCN for a Nationwide Permit # 29 to disturb Waters of
the United States for the Wynne Creek residential subdivision, located in the Town of Angier,
Harnett County, North Carolina. Per your letter dated April 16, 2008, please find enclosed five
(5) complete sets of the additional information that you have requested.
Please call me at [phone] if you should have any questions regarding this submittal.
Sincerely,
URS Corporation - North Carolina
Aharleston, PWS
Senior Environmental Scientist
Enclosures
cc: Sam Nemroff, Penn Wynne Homes
File copy
URS Corporation - North Carolina
1600 Perimeter Park Drive. Suite 400
Morrisville, NC 27560
Tel: [phone]
Fax: [phone]
www.urscorp.com
@gV9W,
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MAY 7 2008
wAMR QUP'111' '
VO?os AND SToitopTER
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Page 2 of 3
Response to NCDWQ Comments dated April 16, 2008
Please provide detailed documentation of the imperviousness for the drainage area on the
south side of the project that includes the proposed track. Per the Stormwater Management
Plan (SMP) Requirements for Applicants Other Than the North Carolina Department of
Transportation, any drainage area that is greater than 24 percent impervious must have an
appropriate SMP...
Please find enclosed imperviousness documentation for the drainage area on the south side of the
project, as well as on the north side of the project (Sheet I-1, Sheet 1-2, and tables). Sheet 1-1
depicts the Drainage Area 1 (south side of project) for the initial phases of the proposed project
(Phase 1 & Phase 2), which includes the primary access road from Old Buies Creek Road to a 95
lot, residential subdivision located in the western portion of the property, and also includes a
recreation center located in the central portion of the property. The Total Impervious Area for the
initial phases is 13.30% for Drainage Area 1 and 2.24% for Drainage Area 2 (see the tables
entitled Drainage Area 1 Current Proposed Impervious Calculations and Drainage Area 2
Current Proposed Impervious Calculations).
At full build out of the project site, based on the preliminary Planned Development District
(PDD) that allows for a mix of single family and multi-family residences, the Total Impervious
Area is 23.15% for the Drainage Area 1 and 37.29% for Drainage Area 2 (see the tables entitled
Drainage Area I Future Proposed Impervious Calculations and Drainage Area 2 Future
Proposed Impervious Calculations). Final site designs for the PDD are still pending. The PDD
area will be developed in several phases. Each phase would require Town of Angier site plan
approval.
At full build out, Drainage Area 1 (south side of project) will not exceed 24 percent
imperviousness. Although the PDD is preliminary, the future conditions depicted are the worse
case scenario. The applicant is committed to staying under 24 percent imperviousness in Drainage
Area 1 when the final designs for the future phases are prepared. Therefore, a SMP for Drainage
area will not be required.
2. If a SMP is required for any of the drainage areas, please provide property designed BMPs
that remove a minimum of 85 percent of TSS from the stormwater generated by the high
density drainage areas. For any BMPs that are proposed, please provide a complete BMP
Supplement Form, with all required items....
As the table entitled Drainage Area 2 Future Proposed Impervious Calculations presents, at full
build out based on the preliminary PDD, Total Impervious Area for Drainage Area would be
37.29%.
Since this portion of the project is has not been designed, the applicant has not yet prepared a
SMP and BMPs. The final designs will include a SMP and appropriately sized BMPS that
remove a minimum of 85 percent of TSS from the stormwater generated by the high density
drainage areas, using on the most current North Carolina Stormwater BMP Manual. At such time,
the applicant would submit the detailed documentation of the imperviousness for Drainage Area 2
(north side of property) along with the complete BMP Supplement Form.
P:Uobs3\ETd\31825673-Penn_Wynne _Homes\Work_Order _1\Draft Permit\Eastem Portion\DWQ Cover Letter - Response to con ments2.doc
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Page 3 of 3
We respectfully request that the 401 Water Quality Certification be written with a condition that
would allow the applicant to provide the required imperviousness documentation for the future
phases when final site plans are developed, and will allow the initial phases (Phase 1 & Phase 2)
in Drainage Area 1 and Drainage Area 2 to proceed immediately, since these initial phases would
be below the 24% imperviousness threshold.
P:Vobs3\ETd\31825673-Penn_Wynne_Homes\Work_Order _1\Draft Permit\Eastem Pottion\DWQ Cover Letter - Response to comments1doc
Drainage Area 1 Current Propos ed Impervious Calculations
Public Streets Entrance Road 1,885 LF 36' WIDE 87,959 SF
Public Streets Residential 5,266 LF 27' WIDE 140,880 SF
Public Streets Future Phase 0 LF 27' WIDE 0 SF
Sidewalks 14,851 LF 5' WIDE 74,255 SF
Phase 1 lots 95 LOTS 1800 SF/LOT 171,000 SF
Phase 2 lots 0 LOTS 2400 SF/LOT O SF
Phase 3 lots 0 LOTS 2400 SF/LOT 0 SF
Alleys 1,905.5 LF 16' WIDE 31,603 SF
Townhome Building and Streets 0 SF
Rec Center Parkin 12,663 SF
Greenway 1,005 LF 5' WIDE 8,059 SF
Total Impervious Area 526,419 SF
Total Area 3,957,580 SF
Impervious Percentage 13.30%
Drainage Area 2 Current Propos ed Impervious Calculations
Public Streets Future Phase 0 LF 27' WIDE 0 SF
Phase 3 lots 0 LOTS 2400 SF/LOT 0 SF
Sidewalks 28.0 LF 8' WIDE 224 SF
Townhome Building and Streets 0 SF
Rec Center Building and Pool 12,106 SF
Total Impervious Area 12,330 SF
Total Area 509,727 SF
Impervious Percentage 2.42%
Drainage Area 1 Future Proposed Impervious Calculations
Public Streets Entrance Road 1,885 LF 36' WIDE 87,959 SF
Public Streets Residential 5,266 LF 27' WIDE 140,880 SF
Public Streets Future Phase 2,935 LF 27' WIDE 106,979 SF
Sidewalks 14,851 LF 5' WIDE 74,255 SF
Phase 1 lots 95 LOTS 1800 SF/LOT 171,000 SF
Phase 2 lots 41 LOTS 2400 SF/LOT 98,400 SF
Phase 3 lots 29 LOTS 2400 SF/LOT 69,600 SF
Alleys 1,905.5 LF 16' WIDE 31,603 SF
Townhome Building and Streets 109,674 SF
Rec Center Parkin 12,663 SF
Greenway 1,630 LF 5' WIDE 13,074 SF
Total Impervious Area 916,087 SF
Total Area 3,957,580 SF
Impervious Percentage 23.15%
Drainage Area 2 Future Proposed Impervious Calculations
Public Streets Future Phase 707 LF 27' WIDE 23,490 SF
Phase 3 lots 14 LOTS 2400 SF/LOT 33,600 SF
Sidewalks 643.0 LF 5' WIDE 3,215 SF
Townhome Building and Streets 117,676 SF
Rec Center Building and Pool 12,106 SF
Total Impervious Area
Total Area
Impervious Percentage 190,087 SF
509,727 SF
37.29%
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O 300 600
02008 by ETd, PA. No portion of the drawings
may be copied, reproduced, redrawn or modified
21 SHEET
without the written consent of ETd, PA. SCALE: HORIZONTAL 1" = 300'
Er-AM, TODD, d'AMBROSI
URBANnARNwa.LNDSCc ARCWIT:NAE
CIVS. ?G. LAND USE CONSULTNO
ROBBINS
IN ASSOCIATES
IN IFRNA'fIONAL
OOL4 COURSE DESIUN MASTIER PIAN.1-
CO`STRUC ION MANAGEMENT
2880 SLATER ROAD. SURE 200
MORRINVU LE. NORTH CAROLED 27560
USA
OFFICE 919.4612021
FAX [phone]
EMAIL etd(-tdp--
PRELIA0VARY
NOT FOR
CONSTRUCTION
WYNNE CREEK
CURRENT PROPOSED
IMPERVIOUS
SURFACES
CLIENT
PENN WYNNE HOMES
P.O. BOX 240
WYNNEWOOD, PA 19096
[phone]
CONTACT: SAM NEMROFF
ENGINEER
ELAM TODD d'AMBROSI
2880 SLATER ROAD, STE. 200
MORRISVILLE, NC 27560
[phone]
CONTACT: SUSAN HOBBS
ENVIRONMENTAL
URS CORPORATION
1600 PERIMETER PARK DR
SUITE 400
MORRISVILLE, NC 27560
[phone]
CONTACT CHARLES BENTON
Drawn By: BMH
Checked By:SWH
Dale: 5-1-08
Proj#: 2701010
Revisions
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DRAINAGE AREA 1
916,087 SF IMPERVIOUS AREA
3,957,580 SF TOTAL AREA

23.159 IMPERVIOUS PERCENTAGE
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DRAINAGE AREA 2 DESIGN
190,087 SF IMPERVIOUS AREA i .
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37.29%" IMPERVIOUS PERCENTAGE

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©2008 by ETd, PA. No portion of the drawings
may be copied, reproduced, redrawn or modified
without the written consent of ETd, PA. SCALE: HORIZONTAL 1" = 300'
ELAM, TODD, d'AMSROSI
UR PuRRwa.VJID9CAPAARQO,4nOR9
crW.mmamAO.IANDUWCONS nM
ROBBINS
IN ASSOCIATES
INTERNATIONAL
1'i0LF000"E DESIIN -STERPLA-NG'
CONSTRLCF10 MANAGE-NT
2W SLATER ROM, SUITEM
MORRINRIP, NORM CAROUNA 275W
LIRA
OFFICE 919481.2071
FAX 919.481,2773
EMAIL eldeactdpa-,,
PRELMNARY
NOT FOR
CONSTRUCTION
WYNNE CREEK
FUTURE PROPOSED
IMPERVIOUS
SURFACES
CLIENT
PENN NYNNE HOMES
P.O. BOX 240
WYNNEWOOD, PA 19096
[phone]
CONTACT: SAM NEMROFF
ENGINEER
EL4M, TODD d AMBROSI
2880 SLATER ROAD, STE. 200
MORRISVILLE, NC 27560
[phone]
CONTACT. SUSAN HOBBS
ENVIRONMENTAL
URS CORPORATION
1600 PERIMETER PARE DR
SUITE 400
MORRISVILLE, NC 27560
[phone]
CONTACT: CHARLES BENTON
Drawn By: BMI
Checked By:SNH
Date: 5-1-08
Prof: 2701010
Revisions
SHEET
I-2