20080680 Ver 1_More Info Received_20081208

DR. J.H. CARTER Ill & ASSOCIATES, INC. ?19@190w[EDO
Environmental Consultants DEC 8 2008
P.O. Box 891 • Southern Pines, N.C. 28388
[phone] • Fax [phone] DENR-WATER QUAUTY
WER MOS AND STORMWATER BRANCH
Letter of Transmittal
To: MS. CYNDI KAROLY
DIVISION OF WATER QUALITY
401 WETLANDS UNIT
1650 MAIL SERVICE CENTER
RALEIGH, NC 27699-1650
Date: 12-5-08 Job # 0817
Attn: Cyndi Karoly
Re: Savannah's Garden permit
DWQ Project # 08-0680
WE ARE SENDING YOU
_ Attached
X Copy of letter
Prints
Reports X Maps
Plans Data
Photos
Permit
COPIES DATE # Pgs DESCRIPTION
5 12-3-08 2 Letter from NSE: response to DWQ letter dated 11-10-08, regarding
Savannah's Garden subdivision, Carthage, Moore County, NC
5 -- 1 Erosion Control Grass Lined Channel Design provided b NSE
5 12-5-08 5 Full-sized plats provided b NSE

THESE ARE TRANSMITTED
X For approval Approved as noted
For your use Approved as submitted
X As requested Returned for corrections
For review and comment For your information
REMARKS: Ms. Karoly,
Neal Smith Engineering, Inc. (NSE) has provided a response and mapping related to the
engineering concerns in the DWQ letter dated 1 I-10-08. Mr. Scott Matthews of NSE
had a productive conversation with Ms. Annette Lucas regarding this project on 12-2-08
and NSE has provided materials requested by Ms. Lucas in the conversation. As you are
likely aware, we have an immediate need to move forward with stream/wetland restor-
ation on this site, pending issuance of the 401 Certification. We anticipate that the
materials submitted herein will satisfy DWQ's remaining needs. Please contact me with
any questions. You may also contact Mr. Matthews directly at [phone].
Jennifer M. Archambault, Wildlife Biologist
COPY Mr. Ken Averitte - DWQ
TO: Ms. Emily Burton - USACE
Mr. Ron Jackson - Quality Built Homes SIGNED: ytit Q,'?
If enclosures are not noted, please contact us medial
Endangered Species Surveys • Environmental Assessments • Land Management 9 Wetlands Mapping and Permitting
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December 3, 2008
Cyndi Karoly
NC Division of Water Quality
225 Green Street - Suite 714
Fayetteville, NC 28301-5043
Re: Savannah's Garden for Quality Built Homes
Carthage, North Carolina
Response to Letter dated November 10, 2008
NSE Job #0522502
DWQ Project #08-0680
Dear Cyndi Karoly,
9944'. :
DEC b ?008
l4D1DSANDSTjj g
This letter is in response to a letter dated November 10, 2008. DWQ's comments have
been copied and italicized and our responses are as follows:
1. Drainage area 4 has four separate stormwater discharge points. Per NCAC 2B
15A; 02H.1000, a drainage area is defined as "the entire area contributing
surface runoff to a single point. " Please provide an analysis of the imperiousness
of each of the separate drainage areas that have been termed collectively as
"Drainage Area 4. " The DWQ continues to believe that this portion of the
development is high density. If so, then an appropriately selected and designed
BMP must be provided to treat the stormwater from Drainage Area 4.
Per the phone conversation with Ms. Lucas, on December 3, 2008, we
concluded that all the surface runoff flows to the existing roadside drainage
channel. Ms. Lucas commented that the drainage channel must be protected
from erosion, and that the land south-west of Robert Place must remain
undeveloped with permanent open space. The developer has agreed to the
conditions. NSE has label the land as "Permanent Open Space" on the map,
and provided a rip-rap liner for the existing channel. NSE will update the
erosion control plan with these changes for NCDENR Land Quality approval,
and provide DWQ a copy of the approved erosion control plan if needed.
The existing impervious surfaces were surveyed by a Professional Land
Surveyor to verify its accuracy. NSE is confident that "Drainage Area 4" is
low density.
Neal Smith l-,n >incering, lnc. Southcru Pinrs, NC'
DWQ NOV
NSE Job # 0522502
If you have additional comments, please feel free to call me at 695-8825.
Sincerely,
NEAL SMITH ENGINEERING, INC.

A. Scott Matthews, PLS, Principal
Neal Smith Engineering, Inc. -Southern Pines, NC
Erosion Control Grass Lined Channel Design
Client Savannah's Garden
Job # 522502
Design for Q (rational method) - Use 10 yr storm
Q = CiA
Q = peak runnoff
C = runnoff coef
i = intensity
Tc = time of concentration
A = drainage area in acres
A = 14 acres
C = 0.95
Tc = 1.5
i = 7.4 in/hr
Q = 98.42 cfs
Permissible Velocity Design - Grass Lines Channel
Slope = 0.02 ft/ft
V all = 4.5 ft/sec
n = 0.045
Z = 3 ft/ft side slope
B = 3 ft bottom width
Weighted Average
CxA
C1 = 0.95 Al = 14 13.3
C2= 0 A2= 0 0
C3= 0 A3 = 0 0
C4 = 0 A4 = 0 0
13.3
Cave 0.95
d(ft) A(ft^2) R(ft) VR n V (fps) Q(cfs)
2.67 29.3967 1.48 6.65 0.045 6.08 178.63 No Good Velocity Check
Good Runnoff Check
Check for Bare Soil n for soil 0.02
V all 2.5
V = 13.67 Liner Required
Design Permanent Liner
Get Liner Type from 8.05e n for liner 0.035 Rip-rap Liner Required (6"stone)
Td = 2
Find d--Changed until O in h45 equals Q in cl9
d(ft) A(ft^2) R(ft) n V (fps) Q(cfs)
1.5 11.25 0.90 0.035 5.62 63.18
T= 1.87 Good
Check Bends
Rc = 0 ft Radius of Curvature of Bend
Rc/B = 0.00
Kb = 0
Tb = 0.00 Good
Lp = 15.28 ft Length of protection downstream