20061347 Ver 1_More Info Received_20061010

Soil & Environmental Consultants, PA
11010 Raven Ridge Road Raleigh, North Carolina 27614 Phone: [phone] Fax: [phone]
www.SandEC.com
October 9, 2006
S&EC Project # 6442.W1
DWQ Project # 06-1347
N.C. Division of Water Quality
401 Oversight and Express Permits Unit
Attn: Cyndi Karoly
2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27604-2260
RE: Response to the August 28th Request for More Information
Howard Farms; North Flat River [030401, 27-3-2, WSIII, NSW]
To Whom It May Concern:
On August 29, 2006, S&EC received a letter from your office regarding DWQ No. 06-1347 requesting
additional information to process the permit application. Specifically, your office cited deficiencies in our
application related to the following:
1. Please provide cross section details showing the provisions for aguatic life passage.
2. Please indicate all stormwater outfalls on the site plan.
3. Please indicate the diffuse flow provision measures on the site plan, applicable worksheets, and
signed and notarized Operations and Maintenance Agreement.
4. The proposed pipe alignment results in erosive velocities directed into the streambank. Can the pipe
be realigned to result in stream flow parallel (rather than perpendicular) to the downstream channel?
In r. esponse to these requests, you will find the attached documents to contain cross section details, stormwater
outfall locations, updated level spreader designs with applicable worksheets, the signed and notarized O&M
for the BMP devices, and revised pipe configurations that address, to the extent practicable, downstream bank
erosion. If you require further information or would like to discuss the project in detail, I can be reached at our
office or by mobile at [phone].
Sincerely,
._.
~ .,,y3,~,__-_.. ___--__--
ason Payne
Environmental Scientist
Attachments: 1) Updated Wetland Impact Schematic
2) Level Spreader Worksheets & Calculations - --~- ; ~,
3) Signed & Notarized Operations & Maintenance Agreement ~ °, r ~ j !'~> t , ? ''~'a
4) Cover Sheet, Plan Profile, & Detail Sheet Packet c °"~ ' - •" a- , ~ '""
~r1
cc: Mr. Lin Cates '.-' ~ .,
,yc,; r ,
Charlotte Office: Greensboro Office:
236 LePhillip Court, Suite C 3817-E Lawndale Drive
Concord, NC 28025 Greensboro, NC 27455
Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone]

~+ 1
HOWARD FARMS SUBDIVISION
PERSON COUNTY
LEVEL SPREADER WORKSHEETS
AND CALCULATIONS
FOR:
Howard Farms of Person County, LLC
303 Salem Church Road
Hurdle Mills, NC 27541
Gvrn~v~„,t~
ld~(7~~
~~
®oe©eoo®a®oe~~®
September 26, 2006
r o° a v S1=AL~~ °o ~ '-
$ 27892 V o
m Q,: a
of
cp`°m/V E~°~~ °°
c
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q/a~/~~
Calculations By: Steven P. Bailey, PE
Engineer:
Coulter Jewell Thames, P.A.
212 South Lamar Street
PO Box 1086
Roxboro, NC 27573
Ph: 336-330-0368
Fax: [phone]
~ao4 ~3y7

Narrative
The purpose of this project is to construct the subdivision road infrastructure for a
portion of the Howard Farms subdivisidOivision road constructed t NCDOT st ndards.
infrastructure will include a public sub
The road will have a pavement width of 18' and end in a cul-de-sac.
The project site is approximately 8 milebeen included on the Cove~Sheet of tthe
Vicinity Map showing the project location has
Plans. Soils on the site are primarily Hydrologic Soil Group B. The site is located in the
Neuse River Drainage Basin.
Work on this project will include grading, road construction and installation of
required storm drainage pipes. Sediment and erhe is c~ov de the profile of the centerline
Plan and Profile Sheets. The Plan and Profile S p
the proposed roads. Erosion control devices include a temporary construction entrance,
erosion control matting, check dams and silt fence.nTh hatdw dltc eventoerosion dur ng the
been designed using temporary and permanent lmi g P
10-year storm event.
Level spreaders have been shown to prod drueielfar Bused to divert largerch per
hour rainfall event. A splitter box and bypa
stormwater flows away from the level spreaders. e tormwater flow and allow some of
each level spreader to provide pre-treatment of th
sediment to fall out prior to the level spreaders.

pWQ Project No
- LEVEL SPREADER WORKSHEET
DIVISION OF WATER QUALITY
I, PROJECT IN
Project Name
Contact Person:
Level Spreader ID:
~~
~S ft.
~~ 87 ac.
ac.
v °~°
Level Spreader Length
Drainage Area
Impervious Area
Maximum Filter StriplBuffer Slope
grass
Max. Discharge from a 10 Yreadero~
Max. Discharge to Level Sp
Filter StriplBuffer Vegetation
s; ~ cfs
pe 7S cfs
urc w ~~ / v"
~°~ ;~
/ ~`
(n
5~,~/u-~
(perpendicular to flow) a to the level spreader)
(on-site and off-site drainag
(on-site and off-site drainage to the level spreader)
(6% for orested, leaf littler cover, 8°/!r thick ground cover)'
(thick ground cover or grass, canopied forest with leaf litter
groundcover)
orc~ ~ ! Cla+~n~
Pre-treatment or Bypass Method
II. REQUIRED ITEMS CHECKLIST ortin documentation is attached. If a
desi n requirements have been met and supp g ement plan submittal includes
Initial in the space provided to indicate the follov~ing 9
uirement has not been met, attach an explanation of why. At a minimum, a complete stormwamittal a ackag
lans and specifications showing all BMPs and outlet serwill resulttinla requestlfor
req lete sub p
design calculations, p
a worksheet for each BMP, eration and maintenance agreement. An inro ect.
drainage plan and a fully executed op royal of the p j
additional information and will substantially delay final review and app er cfs in canopied forest with leaf
_ round cover or grass or 100 ft p
Applica~tials
sT~' Level spreader is at least 13 ft. per cfs for thic g
~- litter.
~(/~ Pre-Form Scour Holes are on flat slopes only
~ No structures are located in protected buffers'
If bypass method specified in the Draft Level Spreader Design Option Docudetai s and calculations are provided
~ Bypass method is specified (if applicable) and plan
ischar a to level spreader and subsequent filter strip is hydraulically and spatially separate from the ypass
5ff D 9
discharge.
5TH No structures are locat ass and toutlets are provided. etation repair.
~ Plan details for the byp reement includes annual erosion and veg is rovided.
~~ The operation and maintenance ag the responsible party p
stS The operation and maintenance agreement signed and notarized by
to 25% in areas
' can be used on slopes of up to 15% in forested are de Design IOpt on Document I This pot ntially requires a
* Level spreaders in series rotected buffer area.
with thick ground cover or grass if designed according to the Draft Level Sp
tected buffer areas. In any event the second level spreader cannot be located in Zone 1 of a p
minor variance in pro
_._ .w., F„u~~uinn information):

pWQ Project No
DIVISION OF WATER QUALITY
1, PROJECT INF~KI ~ ~+"
Project Name : t~~
Contact Person: ~-
Level Spreader ID:. ~ a
Level Spreader Length
Drainage Area
Impervious Area
Maximum Filter StriplBuffer Slope
grass
Max. Discharge from a 10 Yreadero~
Max. Discharge to Level Sp
Filter StriplBuffer Vegetation
Pre-treatment or Bypass Method
- LEVEL SPREADER WORKSHEET
complete the following information):
y.~ ft.
ac.
o ac.
3/S cfs
y cfs
c~ ~- tv c . ~tl
t
or
Phone Number: 33L ~° ' 036:
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level sp )
(6% for forested, leaf littler cover, 8% for thick ground cover)*
(thick ground cover or grass, canopied forest with leaf litter
groundcover)
I, REQUIRED ITEMS CHECKLIST orting documentation is attached. If a
desi n requirements have been met and supp ement plan submittal includes
Initial in the space provided to indicate the following g At a minimum, a complete stormwater manag
ulations, plans and specifications showing aieBMPs and outlet structure details, a detaile
re uirement has not been met, attach an explanation of why. a submittal package will result in a request for
9
a worksheet for each BMP, design calc royal of the project.
Ian and a fully executed operation and maintenance agreement. An incomp
drainage p
additional information and will substantially delay final review an app er cfs in canopied forest with leaf
Apalica! nts=s _Level spreader is at least 13 ft. per cfs for thick ground cover or grass or 100 ft p
litter.
~ No structures are located in protected buffers*
Tz -
If bypass method specified in the Draft Level Spreader Design Option Document:
a Bypass method is specified (if applicable) andllpea s d P asl hydraulically and spatially separate from the bypass
S
5TH Discharge to level spreader and subsequen
discharge. rotected buffers.
Sid No structures are located in p rovided. etation repair.
~ Plan details for the bypass and outlets are p is rovided.
The operation and maintenance agreement includes annual erosion an veg
maintenance agreement signed and notarized by the responsible party p
_~__ The operation and
to 25% in areas
otentially requires a
tion Document. This p
in series can be used on slopes of up to 15°/r ftfLevel SpreadeWDes'gn IOp r cover or on 1 o a orotected buffer area.
L el spreaders din to the D ted in Zone P
ev
with thick ground cover or grass if designed accor
minor variance in protected buffer areas. In any event the second level spreader cannot a oc

DWQ Project No.
DNISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET
1. PROJECT INF
Project Name
Contact Person:
Level Spreader ID: ,
Level Spreader Length
TION (please
Drainage Area
Impervious Area
Maximum Filter StriplBuffer Slope
grass
Max. Discharge from a 10 Year Storm
Max. Discharge to Level Spreader
Filter StriplBuffer Vegetation
Pre-treatment or Bypass Method
II. REQUIRED ITEMS CHECKLIST

Initial in the space provided to indicate the following design requireminimumava complete stormwate~mlanagement plan submttttalhncludes
requirement has not been met, attach an explanation of why. At a
a worksheet for each BMP, design calculations, plans annce ae reements An~ncomple eMubmittal package w~ll esulttinl a request Ifor
drainage plan and a fully executed operation and mamtena 9
additional information and will substantially delay final review and approval of the project.
,Sg Level spreader is at least 13 ft. per cfs for thick ground cover or grass or 100 ft per cfs in canopied forest with lea
Applica~ ials
litter.
SAP Pre-Form Scour Holes are on flat slopes only
~ No structures are located in protected buffers'
If bypass method specified in the Draft Level Spreader Design Option Document:
~ Bypass method is specified (if applicable) and plan details and calculations are provided
~ Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
~ No structures are located in protected buffers.
Sg Plan details for the bypass and outlets are provided.
S ~ The operation and maintenance agreement includes annual erosion and vegetation repair's rovided.
1g The operation and maintenance agreement signed and notarized by the responsible party' p
+ in series can be used on slopes of up to 15% in forested areas Dese of (Option Document IThes pot nt ally5re°quiaes ac
Level spreaders
with thick ground cover or grass if designed according to the Draft Level Spreade 9
in rotected buffer areas. In any event the second level spreader cannot be located in Zone 1 of a protected buffer area.
minor variance p
the following information):
Phone Number:
/~S ft. (perpendicular to flow)
q~ ac, (on-site and off-site drainage to the level spreader)
p./9 ac. (on-site and off-site drainage to the level spreader)
~/ % (6% for forested, leaf littler cover, 8% for thick ground cover)*
o~ ~ Cfs
.5/o cfs
~,~ ~
(thick ground cover or grass, canopied forest with leaf litter
groundcover)

pWQ Project No.
DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET
plete the following information):
T ON (pleas~~
PROJECT INFORM
I
A
.
Project Name : (
f ~
TAR /~y 6 ~3~ - U3~ ~
Phone Number:
%._. -~s=-
Contact Person: ~
Level Spreader ID: - ~.

Level Spreader Length ~~,5' ft,
a y~ ac. (perpendicular to flow)
(on-site and off-site drainage to the level spreader)
e to the level spreader)
draina
i
Drainage Area
Impervious Area ac,
% g
te
(on-site and off-s
(6% for forested, leaf littler cover, 8% for thick ground cover)'
Maximum Filter StriplBuffer Slope
grass
~ a cfs
Max. Discharge from a 10 Year Storm ~ ~ cfs
Max. Discharge to Level Spreader ~.~! } w /~~.. flv
i
(thick ground cover or grass, canopied forest with leaf litter
on
Filter StriplBuffer Vegetat groundcover)

d ~r<~~ ~~ ts.,~
Pre-treatment or Bypass Metho ,
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At ec'fications showingtall tBMPs and outlet structure detailstt al Idetatled
a worksheet for each BMP, design calculations, plans and sp
drainage plan and a fully executed operation and ma rev ew and approvaltof thelprojectlete submittal package will result in a request or
additional information and will substantially delay final
Aaalicants Initials
<~- Level spreader is at least 13 ft. per cfs for thick ground cover or grass or 100 ft per cfs in canopied forest with lea
litter.
~g Pre-Form Scour Holes are on flat slopes only
Sg No structures are located in protected buffers'
If bypass method specified in the Draft Level Spreader Design Option Document:
SQ Bypass method is speclfled (if applicable) and plan details and calculations are provided
SR Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
Sg No structures are located in protected buffers.
Sg Plan details for the bypass and outlets are provided.
sg The operation and maintenance agreement Includes annual erosion and vegetation repair.
Sg The operation and maintenance agreement signed and notarized by the responsible party is provided.
Level spreaders in series can be used on slopes of up to 15% in forvel S reader Des gn IOption Document IThes poten6ally5re°quirers ay
with thick ground cover or grass if designed according to the Draft Le p
minor variance in protected buffer areas. In any event the second level spreader cannot be located in Zone 1 of a protected buffer area.

Level Spreader Calculations

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342 APPENDIX B-1 CULVERTS WITH INLET CONTROL
CHART 2
lo,ooo (1) (2) (3)
- 180 EXAMPLE 6.
- 8,000 6'
- 168 p, 42 inches (3.5 test)
_ 5.
t56 6,000 p.l2o as 6 5,
5,000 Lt.-a Hvr
144 4000 p asst 4'
_ 5, 4.
132 3000 (1} 2.5 e•e
(21 2.1 7.4 4. 3.
120 2~p00 (a3 2.2 7.T 3,
108 'p ~n tut
- 3.
i
96 1,000 __~ ----~ I
2. 2:-
- 800
/ / I
84 600 / 2
500 / ~ i
400 ~~~ X l.5 1,5 ~
e
cn 72 300 ~,+~ N ~!
1z
i _ w 1.5 ~
z ~ 200 / ~ ~
60 / / Q I
Z Z
/ O
0 54 o Z -
100 _ _
Z
w 48 / / ~ 80 ~ 1.0 I.0
-~ ~ ~ z 60 w
v X42 vUi 50 ENTRANCE ~ 1.0
_ HW SCALE TYPE w .9 .9
o ° 40 D a
$Quot edge Mith c3
W 36 30 (i1 eodwall D
~.. Q
w Groore end pitn tx1 - ,8 .8
~ 93 20 (21 Mad.rall =
Q ,8
° 30 Groor• end
pro}ectinq ~
7 7- 'I
27 10 7 ~I
I
24 To use scats (2) or (3) project I
6 horizontolly to scale (I),then
5 Al inclined line tAr ough .6 .6 ~I
2 1 use strotq
4 pond p stoles, or rerersa oa .6
t Itf ~ ~ i11ut1r01ed.
3
18
2
.5 .5
.5
15
1.0
HEADWATER DEPTHVE TS
-2 ~ONGRETE PIPE CUL
WITH INLET CONTR~~
t of Transportation, Federal
Courtesy of U. S. Dep .
Figure B-1. (Chart 2) Culverts with inlet control.
inistration, Hydraulic Charts for the Selection of Highway Culverts.)
Highway Adm

LS #1 bypass channel
Worksheet for Triangular Channel
Project Description
c:\cjt\projects\0632 howard farm\eng\culvert.fm2
Project File
Worksheet
Flow Element LS #1
Triangular Channel
Method Manning's Formula
Solve For Channel De th
Input Data
Mannings Coefficient x.0
6

Channel Slope 0000 ft/ft
1
Left Side Slope 3.000000 H : V
Right Side Slope 3.000000 H : V
Dischar a 5.40 cfs
Results
Depth 0.49 ft
Flow Area 0.72 ft2
Wetted Perimeter 3.10 ft
Top Width 2.94 ft
Critical Depth 0.73 ft
Critical Slope 0.019725 ft/ft
Velocity 7.49 ft/s
Velocity Head 0.87 ft
Specific Energy 1.36 ft
Froude Number 2.67
Flow is su ercritical.
FlowMaster v5.15
Page 1 of 1
09/26/06 Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 (203) 755-'1666
09:54:22 AM

+l ~ r r
LS #2 bypass channel
Worksheet for Triangular Channel
Project Description
c:\cjt\projects\0632 howard farm\eng\culvert.fm2
Project File
Worksheet LS #2
Triangular Channel
Flow Element Manning's Formula
Method
Solve For Channel De th
Input Data
Mannings Coefficient
~
~

Channel Slope .
10000 ftlft
Left Side Slope 3.000000 H : V
Right Side Slope 3.000000 H : V
Dischar a 7.20 cfs
Results
Depth 0.59 ft
Ftow Area 1.03 ft2
Wetted Perimeter 3.70 ft
Top Width 3.51 ft
Critical Depth 0.81 ft
Critical Slope 0.0189 81 ft/ft
Velocity 6.99 ft/s
Velocity Head 0.76 ft
Specific Energy 1.35 ft
Froude Number 2.28
Flow is su ercritical.
FlowMaster v5.15
Page 1 of 1
09/26/06 Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 [phone]
10:04:26 AM

LEVEL SPREADER OPERATION AND MAINTENANCE AGREEMENT
The level spreader is defined as an elongated, level threshold, designed to diffuse stormwater runoff.
Maintenance activities shall be performed as follows:
1. After construction and until vegetation has been established, level spreader(s) shall be inspected after
every rainfall. Thereafter, level spreader(s) shall be inspected at least every month and more
frequently during the fall season and after heavy rainfall events:
a. Accumulated sediment, leaves, and trash shall be removed, and repairs made if required.
b. Inspect level spreader(s) for evidence of scour, undercutting, settlement of the structure, and
concentrated flows downhill from the level spreader(s).
c. A level elevation shall be maintained across the entire flow-spreading structure at all times.
Repair or replace the level spreader if it is damaged.
d. Mow vegetative cover to a height of six (6) inches and prune plants if they cover over half of the
level spreader surface.
e. Repair eroded areas and replace/replant dead or damaged vegetation.
2. The contractor should avoid the placement of any material on and prevent construction traffic across
the structure. If the measure is damaged by construction traffic, it shall be repaired immediately.
3. Inspect and repair the collection system (e.g., catch basins, pipes, swales, riprap) four (4) times a year
to maintain proper functioning.
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance
procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to
the system or responsible party.
Print name: /~-aric `a~c~/yiw~e.~~/~.~P.r e~ >~nr~ar6 ~fr1J nt ~dJOn ~dA~,~ LLB
Cpl bt1 / /W Ann ~-, t f
Address: 303 ~:~e,n C~iur~C ~a~ /~a~~/c ~~/ BUG o77Sy/
Phone:
Signatu
Date: ~ ' ~ b _ d
~d
~°'~"
~~
Note: The legally responsible party should not be a homeowners association unless more than 50% of the
lots have been sold and a resident of the subdivision has been named the president.
I, ~r~~~al- /YI /~o r/ 5 , a Notary Public for the State of _~„~~, ~,~J;~, ,
County of ~rc~n , do hereby certify that 1y~,.;e Co.~s~ Me.Js~Na,ta~,. n~ f>/ir..r~~r~ts o~/~~b~
personally appeared before me this ~~ day of ~,,~,~lorr Zit. ,and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
.•~'~`~4~P~ M ~O~Fs ~~'•.
~~ 'GARY r
[J Q
~~„® G U`
^: PUBS-~ •~ o
,~~''9S~N GOVC,.°`e
~tt4lUtlttt,
SEAL
~~°
~ba~~. iu1, • g a vie S
My commission expires__D~f -IZ -moo ~
Page 1 of 1
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EDGE OF NEUSE P,IVER
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PROPOSED 120"
DIA, CiviP CULb'ERi
70' LONG