20030570 Ver 3_More Info Letter_20090512

G`
S&EC Project # 10783.P2
DWQ Project #20030570v.3
NC Department of Environment and Natural Resources
Division of Water Quality-Transportation Permitting Unit
Attn: Rob Ridings
2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27604
Re: Reply to the Division of Water Quality's Request for More Information
Ligon Mill Road Extension
Wake County, NC
To Mr. Ridings:
The purpose of this letter is to respond to your Request for More Information letter dated
January 22, 2009. The original questions/requests are copied below as they appear within
letter and are then followed by our response.
Additional Information Requested:
1. The lips of the level spreaders are not all parallel to the stream. In fact, level spreader #1
actually Points" toward the grass swale bypass.
The level spreaders have,been relocated and are now parallel to the stream. Additionally, the .
level spreaders have been moved in a landward direction and the filter strips will be re-graded
and re-vegetated (including Zone 2) with grass, therefore creating level contour lines below the
level spreader lips. All impacts within Zone 2 associated with the re-grading and re-vegetation
has been quantified and are included within an updated Riparian Buffer Impact table and
attached for the DWQ's convenience.
It is also important to point out that only-level spreader #1 has been designed with a bypass
swale and the impacts associated with this bypass swale have been updated within the Riparian
Buffer Impact table attached for the DWQ's review and authorization. Additionally, as per the
- engineer, in order to minimize additional riparian buffer impacts the bypass flows for level
spreaders #2 & #3 have been designed to discharge directly into the culvert crossing.
Therefore the bypass pipe to the culvert is set above the first flush elevation, which flows to the
level spreaders, and discharges directly to the culvert crossing. .
2. Contour lines shown on the site plan do not match numbers given for elevations on level
spreader worksheets.
I ,
Charlotte Office: - Greensboro Office:
236 Le Phillip Court, Suite C 3817-E Lawndale Drive
Concord. NC 28025 - - Greensboro, NC 27455
Phone: [phone] Phone: [phone]
Fax: [phone] - Fax: [phone]
Since the level spreaders were relocated, the level spreaders have been re-designed and
therefore revised worksheets, checklists and photographs are attached for your review.
Additionally, we have included the unsigned & un-notarized Operation & Maintenance
Agreement which is.to be signed & notarized by the Town of Wake Forest post-Riparian Buffer.
Authorization.
3. Filter strip numbers given for level spreader #1 are for dense ground cover whereas the
attached picture clearly shows wooded vegetation. In this case,. the slope of the filter strip is
too high. Also, the slopes for filter strips for level spreaders #2 & #3 appear too high. See
section 8.2 of the NCDENR Stormwater BMP Manual for acceptable slope ranges for the
various types of filter strips.
In order to meet slope requirements, the level spreaders have been relocated and moved in a
landward direction therefore increasing the width of the filter strips. Within this increased width,
the filter strips will be re-graded,and re-vegetated (including Zone 2) with grass. Therefore, the
level spreaders all have been re-designed utilizing the length calculations needed for "wooded
vegetation" in combination with "grassed vegetation" and therefore should meet the slope
requirements outlined within Section 8.2 of the NCDENR Stormwater BMP Manual.
We anticipate that this answers all of the DWQ's questions in order to complete the final review.
process requested for the written concurrence of Water Quality Certification 3704 and a
Riparian Buffer Authorization. If you have any further questions or any additional explanation is
needed, please don't hesitate to call.
Sincerely,
Debbie Edwards
Environmental Specialist -
CC:
Michael Kaney-Weingarten Realty
Marty Bizzell-Bass, Nixon and Kennedy, Inc., Consulting Engineers
Attachments:
1) Updated Impact sheets for Impacts A, B, C and Level, Spreaders 1, 2 & 3
2) Updated Overall Impact Map and Level Spreader Details
3) Updated Riparian Buffer Impact Table
4) Revised Level Spreader Worksheets, checklists and photographs
.5) Operations & Maintenance Agreement (unsigned & un-notarized)
i
II '
it
° ?l*
m \ ?, p?.\ \ \ \ _ 11 I O I
m
m \ \ _ o?' _? ?u\§41 14n app 17? # O c m
111 °° s
74
\?. \ II111\ 1 A
yR.TT.hk r m
I l BWq? ° JOo \ ?? \ r \ \ c z z
no ?I k V ?4s\ZS'Yre'?I o I\ ?? Vz?y
D I o // / y a S - ?//\\ m\\ c=
n I n /% / 91 y' ??` s \ 'zn a ommN
I ? o / / ? a{ r\N sup-'k. \ ' ('?F,. \ ? Or ?-
M1c / / ? a\ N 'N O+ O D A
30
.?\ \ N\ / / e ? -c ? -o sue, _ ?
o CDC&
v
T ?i
W4C
WA?t
AU
YF y z r 4 w
o /? 1 kA y y ?x ""w°v
M?mm
vF °-?Nrv;
` \ v t9 A ?t>+Y44? ?t „rb\ a? ? ?l I ,17 ' -I O
v. 1'??.-gyp ` e,)\ i id r Ie" cn. r.•? IP e V i v /? ??i m?F?<_?
RD ?g
Rqt
A V // X v e W d?, ,, w,+,?'- K?>w •'?s??-' ?L ; , . /? i' >,> I \ {v I / m n n?i ° /%
\ ?` \ \ \ _ - - ?? 3NOZ 280
/
n A, !/ ! \ \\ \\ \v l' d ' b3??0? ro I
9 y /f/
I
v!! f `v j? y ? ? vv ??i A?
7 ( \ ^r i i
?- -
11 l \
\\\\ 1 fl \ \\`\ \ \0 1 I \` \
\ly
II
W 11I \ 11 \ \ I \ f` \
BASS, NIXON & KENNEDY, INC. JOB No. 04-08043000
CONSULTING ENGINEERS LIGON MILL ROAD © .JN cNARl Nu SOAO,SU E :so EXTENSI
ON
DATE 12-12-08
NAIEIGN, NOFNI CAflOUNA T!!G)
.ran NEnrtAM IMEO ,SU I31 DRAWN BY
WM fOq .WO U OUNA Z J.JONES DEVELOPER WEINGARTEN REALTY INVESTORS
.TEIE ME: WLNE1 ON 19001a lvq APPROVED BY MDB TOWN OF WAKE FOREST, WAKE COUNTY NORTH CAROLINA
\ v
o \ ? _
v to ?\ _ ,\\ I I i 1 m?WA? \\ `\ ^
r' n \ '.'. \ \ \\ \ I I I I O D :N O ?` \ s A
41 (A'70
F \ \'` I mpox-C7
m $ z'`\`, ?\ \?\\\'' \` I I III I l 1 x\ ?w .•\
.. \ 1 - X10
v v' A 1\ vv\ V 1 mTX\ rm ?;m
\ \ ,! ,\' 1 \ \ \ \ ?, z
Dmw o \ y
\ .. q F \\1\\\\ •\ \ \ aN \n T -z
s
N \ \
o _ __ ??, :v \\s0 A v A
o ya _ ` A ?? A V sz
o n? poi
Emm
o ?"? nA? v. A AV A / w T_
zs
D 010 Ykyy .
ti m \ Yom? \ 1 ?Ar "`T'`V r z
I- AE 0
a \ zD \ \ 9 ...... l: ??r"? o z s
\ \ ?, xn s z
?! I ?'? i? ?!? >? rg". €11 r ` f• Y FS'.. ,`k?v Ly??f.?'?I?`(nS,Y'?? ???` ? I ?O R1 A
lJ \ / \i / ?(A w yT ygxt!!i?-1 yw'?. A £.,.T:!! r ' ! ~
z p N
-mc
m Kg4..
W k?"' , ?+ a>h4y?'a' / „ J{?b?\`' r r k •.„ I1 a 0 m m N
ea to
I w¢????i?k; V. y 4'qt? / ( '? Y .ry`a/'? ! yi a'C?M#!? ? I N yCrk ?.
"'?k}?,C4 ??yx'??'? ?`1 ?s."? !F ? +a^t ,{j"x ?Y•7?+rt I " s
rt1'e 1i`us[ S.\ n 8 yf"ik?rr'?j I 1 I nt O f'f
}}.e rv,yl... k ] ?s ?r}??vi Jlsw{?N1R!"?I°?m'? ?T.y
?hx?NFT•r4!'f+1` I rt} iibl? ?ij1\ II l1?+l iP I I
III * .^.?$,+ ?•. V ? ? ^Va"1 ?m5+§Ii F?<k,I?.?Y?.{{•'?,€ ?""s I ? ? I _)'i
\ I s i . `? P.??}?.'5??. •, ,.,,,L r' t ° x ? r+ ????i?`;nsY a t*?ri? ? V _ ?- ??? ^ ? -1
d. +s ''- t" x°3^.RuS'• ? N/ ?' ? r ? t ssa `.3's Ls d
{r 1{ 4 h) Ru"' I ''u A 0 s;; m
AlliCs
„ F ? n F'v,ys?? _.. < • \ 1?f j k ?tl? _v t I ? 1 Vry
Iefill,
I 1 ! -i
\ SI+?'de.''\` I? M ^µ ?m 'f1 ?"P}!' .+r r vc4^Sk,X?tiiv+'{`kw / '- I' ?/1 i? VI
V r rb{x4vY' ?h d ' ZZ ? l ^ ? u31? se ?I ?•S.??t it /? r m ti
aOLk{u 4^i 1 kr Pi"? \` Z t'! kj•d?? +k e 4? "'3 ?a r // jF m m
n Ss ?r4,?witi!`n 0
C
?4'.Ci? PF?'y""lkrl?R O
\ I,., ,s p tiJ'^vy' 14u ?, ; A, 1 \, y, g„' e .{,F s ern. / / / I D?
?r p,s r x .e]., ' t ? ga
•\ \?4Tg4"Vf,
? Gi 5??,?1t'\?\\? I?}?S ,?`'e? ? ?\_ /? -?A /(,? ? ?V • I
\ \? ?\ a Ny `i?` wt!f ?^ r??' ky y i / m / I I
\ tidr R " t?\k \ Aid / /
v /Z
? x
>ZE
\ .\ .Aw yy?rt^ \ \ \t ` ZD I
\ 0r i ' /•
\
\ \ rm \ iOtldW?pr< /
3aOStl3WOS
??\ \\ `\ \ \ ?? III',I`I I dal V4083
\ \ \ LIII I 4?Ntl9a33jf9 a3nta -3 n3N
\ \ \Soo \\ \\ II?II? I!I I I I ??r ? /r /
v v v ?'v? ? I I I I, I I I
\ 1 I ?I? I I
\ ?\ I II II I i?Il r.
\\ \ \ \ ! 1 /
V A A •^ ? ` 1:1?
\^\ 11? 111 I I 1 / r
F In I ?? F %
CONSULTING E E 'ANNE INFERSNC"110No. °' °e°'3°°° LIG N MILL ROAD EXTENSION
. CO
•?+^ ?? ? ??•? Aso DATE 12-12-08
nuacH, NOIRN cAEDU nem
. .a NEERAGE TRADE D .SURE ]0'I DRAWN T J.JONES DEVELOPER : WEINGARTEN REALTY INVESTORS Rl [3 WAIT MMM, W M
W Z EE>
. IELESNONE: IMIW1 ON (MIa WO APPROVFD RY MDB TOWN OF WAKE FOREST, WAKE COUNTY, NORTH CAROLINA
1 I? I I ! I!? f1I I ^?, v
II I / // ?I I w \ ?-
/
r
? I
i0
A
:,, -\ ? \ ? -?, _, 1 II I ? I I?I I 1 ? IIII l l , lr I I I / / ? ?
a- .,\ \\ \ ? I I I III ;1 I ( / % I I I // m
\ A A A A A? \ vA A 11 / / / I /,;` r
\ \ \ \, 1 \\ \\1I1 / ( I / a
\\ r
\ \s \ \\\ ?\ \\\11 \ ` \\ \\\ \ / / /r / I I / l'1 ti
\ \\\\\\ \`1 \`:`\ \\\\\\ 1 I // / y
m A\ 1 V V 1 ?, 1 V'1 V 1AA\ V AAAV I 1. ? v I r--t mix ? / s? ?
_ \ \ 111`\\ \J\` 11'i I/ f' °° n -
GG ,
11\I
1
\ v v A , ? Al vv?? 1 A 1 III 1,/ %/ ? ? I I I ,? I ?? ? ?^
\I 1 v` 1 I v Irv 1 1 III I' /yI I I 1 ?' -,z
I
IN z (nma
oam .
( I 1 r I 11 ?1 1'1 ?1 V v !A .I V I ?. m
O
co
o h-- 1 1 ?II11,? II A A\ /? m;a
1? r ??L / 1 1j1111 1 1\ III\I' I \ I i I ?--?:? ???
.L 1 6 I AV A Av V I `i? /?v /'? •-30
?I? I 1 \?\I 1\ 1 I1I ,`I 11 1 \ \ \ \ I / ?1\ ?\ //
n /jy/?jl)) 11 'II IIII] ) I; ! I?// / \\\ //\? rn
i
m
v+Nm
_\ f?lll T Qmz-
1 III III1;11 /?// // \ \ / w mu
?, I ?? r AV I? 1 ?II I( ? l 1 _? -I ? / I I N yco
E 'mo
Ilil/'}tT II 1 IIi.\\ 'ill?ll?li?- /yyl;,s}I\// i Z<°,`?'c
N / ( 1 ZOO
"? I / r 1 k r ' r ' 1 i `, A I I I \ 3 ` ? b I <g - - m c c
P/ I ?IIIIIIII V-. (111 o N? / I I Nc?m
\ 1 111 a 1VA ??v Ii I III I y i? l m? I II u. o m m
I \ \ Rle s?'?; ! I I ,I May I? N . x / r I a
n l \ '1 1I
I I . I \ ?, (h'??"`"' \ \ 'u \ \ 1 I? 1 11 ?Ihr9 S W N
CL \ \\ 1\ IJ I PM o f 1 ?ro-
Iv.3s cf) A 1 ` m o n
I 1 I IU i I I t 1 \ ` _ , \ \ 11 11.11 I ? m/ -0 \ zmy
I (T1 NI I I, \ 11 / I i10 rDn .SZ \ \
D .Nl ;? ? dol oad II S
. ITf. t\ \ \ Ia(3N H Sy l a3jafi\ 3\I 1jVdwl 0?
?nmmQa
\ 1 1113NOZ
v. t aan a° sn? os v t 1 i
so
? V 1 1, d d? (\ 4,I I . s <
s:rv?? ' ? \ Z \3N(id L . NOZV ,OS? 111 I\?A??t15 ?S 1tiA63?I'S?' *u A I ? ?" w n
\ / ? ? ? 1 ? Z \ N v ? V ? ? t`A? ? \ *? v \ or r l m? V I ld S ? _ ? ?
1 ?'fP m a Q (\ v v l',? I 1 ?"? ' 1 d? I
'?,a\ ti , '\ \ 1 ?\ \, -y rrnv ' \ 1 NN II p"L*Ik\Ry1 \I " ~
a ?
t1? y ' - 1- x ( ri?lb I?x;,'?r'?SArI? vI 11 ?„ ?^??.t,_ mmm
\-.. ' \ \ • ? _ N - -..... \ m ? Ew < ? 1 I I ? l \ .\ ? m 1?`v{v ! ,m.-t3,.+F\1ii}?,, i\ ?1 I h ? ? - A
\ z dv n?N o ('v? 1w 1 v -nK
` `.v v A l w??v `?'z°m\? III I ?'? `? \ OVA c•? w A ? ' / z
v 'V ,, _ A ?, `\ ro \Y r O z a m
' ?? A - ASV A vv Av1 A A ?A i 11 0) w 0m0
e
3. z
\ \ V A \ A1. J z N
V ss ?V A A v ? V v' V , wr v t s ' 'sat -u mm nr av - 1 r CC) O
295
` \ r
\ROAD r I \ .I
1 t
\ \ \ =? `90 \?q?,s?3,.\A ^Ra "?..? ? ?I l 1 _r r \ u. 1 - , ss 1
\ V A V a- a? \)tA?? "4 y a \ p w\ \y \ \ I
-I-?--
-Q a-
V > n - ?t?? c(1 PV n> `• V . '? A\\z ?'"??t 1 p I
\ \ \ \ z ?.o \ \ Al\r 1= Ir`?+?I V a1? w
\ v A v ? A A ?` A C v O `VV `, ( ? I I A 1 1
?- v v v ?. 1 v v,A:, ? I 1 A V v?f?
o\\\\ \ \\ 1\ 'r 111 1\I \?` \ \1 I 111
BASS,NIXON & KENNEDY,INC. JOB NO. c'4-08043000 LIGON MILL ROADI EXTENSION
. © CONSULTING ENGINEERS DATE
•nro cxun lu xwO, aorta 350 12-1 -08
NILLI]O1,ND11I11 CAgol?U 3M0]
. .W MENAGE TOME DPIV UNA 301 DRAWN BY J.JONES DEVELOPER WEINGARTEN REALTY INVESTORS
WRIT FOPEB?, Wm CAflOl1NR ZlOn
IYlE ME: IT01004W3 OR lml3 lvs APPROVED Y MDB TOWN OF WAKE FOREST, WAKE COUNTY, NORTH CAROLINA
m to /
N /
O
3. /
m j
'am
v In?ssr - ? -???-
? a oyNN \
/ s
Zms ///
m y s /
CD m
N s s r ?= /i
.0 , _.
co .0
L" ??Com
t0 CR1
low
NM .9
s ' I
x ,-'
m C,
qq
CD 9100" .". '4Ccn
CUMI-O
omo
O ?O ?Z
et'A
z \\
per,'x \ \\
qV.
m I I ?? I n -- _\ a.-
r-
L
"Ok
A
141 ?
I
?p / / -" -
I/
,
r >M>
zw.
DO
/ V
/
0
BASS,NIXON & KENNEDY,INC. JOB No. 04-06043000
0169 CONSULTING ENGINEERS LIGON MILL ROAD EXTENSION
? CHn N ROAD,s M DATE 12-12-08
RaEICN,NORN C Ur nW7
'w? HER ?NOR? EE DRM 1NA zne DRAWN BY J.JONES DEVELOPER : WEINGARTEN REALTY INVESTORS
.i HONE: (ns? OR 180013 IV6 APFROVF0 BY MDB TOWN OF WAKE FOREST, WAKE COUNTY, NORTH CAROLINA
1. Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233
(Meuse), 15A NCAC 213.0259 (Tar-Pamlico), 15A NCAC 0213.0243 (Catawba) 15A NCAC
2B .0250 (Randleman Rules and Water Supply Buffer Requirements), or other (please
identify )? Yes ® No ?
2. If "yes", identify the square feet and acreage of impact to each zone of the riparian buffers.
If buffer mitigation is required calculate the required amount of mitigation by applying the
buffer multipliers.
Impact "A"-Road Crossing
Zone* (sImpact quare feet Multiplier Mitigation
1 7190 3 (2 for Catawba) N/A
2 4417 1.5 N/A
Total 11607 N/A
Impact "B"-Road Crossina
Zone* Impact
(square feet) Multiplier Required
Mitigation
1 8831 3 (2 for Catawba) N/A
2 4938 1.5 N/A
Total 13769 N/A
Impact "C"- Road Crossina
Zone* Impact
(square feet Multiplier Required
Mitigation
1 7732 3 (2 for Catawba) N/A
2 5374 1.5 N/A
Total 13106 N/A
Impact "D"- Reinforced Veq Swale (bypass)-Level Spreaders 1
Zone* Impact
(square fee[ Multiplier Required
Mitigation
1 462 3 (2 for Catawba) N/A
2 2859 1.5 N/A
Total 3321 N/A
Impact "E"- EXEMPT-R-grading & Re-vegetating Zone 2
(Level Spreaders 1, 2 & 3)
Zone* Impact
(square feet) Multiplier Required
Mitigation
1 0 3 (2 for Catawba) N/A
2 6545 1.5 N/A
Total 6545 N/A
*Zone I extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
q
®??.i ?o4 wArrC
NCDENR o
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)I

I.XP,R08 ECTI I NEO RMATIO N
Project name LIGON MILL ROAD
Contact name MARTY BIZZELL
Phone number 919-645-2096
Date April 7, 2009
Drainage area number
II..JD ESIG NIIN F,OR MATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP NIA
Drawdown flow from the BMP cls
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area 131,115.60 ft'
Impervious surface area 48,787.20 fle
Percent impervious 37.21 %
Rational C coefficient 0.72
Peak flow from the 1 inlhr storm 2.17 cfs
Time of concentration 5.00 min
Rainfall intensity, 10-yr storm 7.22 inmr
Peak flow from the 10-yr storm 15.65 cfs
Where Does the Level Spreader Discharge?
To a grassed bioretention cell? N (Y or N)
To a mulched bioretention cell? N . (Y or N)
To a wetland? N (Y or N)
To a filter strip or riparian buffer? Y (Y or N)
Other (specify) NIA
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 46.00 fl
Width of dense ground cover 0.00 ft
Width of wooded vegetation 30.00 it
Total width 76.00 it
Elevation at downslope base of level lip 283.50 fmsl
Elevation at top of bank of the receiving water 280.00 fmsl
Slope (from level lip to to lop of bank) 4.61 %
Are any draws present? N (Y or N)
Level Spreader Design
Forebay surface area 98.00 sq ft
Feet of level lip needed per cis 34 ff/cfs
Answer 'Y'to one of the following:
Length based on the 1 m/hr storm? Y (Y or N)
Length based on the 10-yr storm? N (Y or N)
Length based on the BMP discharge rate? N (Y or N)
Design flow 2.17 cfs
Is a bypass device provided? Y (Y or N)
Length of the level lip 75.00 ft
Are level spreaders in series? N (Y or N)
Please complete filter strip characterization below.
OK
0C
OK
CK
Level speader length 0K.
Form SW401-Level Spreader, Filler Strip, Restored Riparian Buffer-Rev.5 Parts I. and 11 . Design Summary, page 1 of 2
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material
N (Y or N)
Y (Y or N)
3.00 ft
3.00 ft
9.00 ft
1.00 It
4.13 cfs
NAG C350

M

Form SW401-1-evel Spreader, Filler Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 2 of 2
III. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
MDB 1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Forebay (if applicable),
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.
MDB 2. Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
- High flow bypass system,
- One foot topo lines between the level lip and top of stream bank,
- Proposed drainage easement, and
- Design at ultimate build-out.
MDB 3. Section view of the level spreader (1" = 20' or larger) showing:
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
- Downslope filter fabric.
MDB 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
MDB 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
MDB 6. The supporting calculations.
MDB 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
N/A 8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of 1
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation .
Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC, 1993). Forested filter strips do not require this type of maintenance.
Once a year, the soil will be aerated if necessary.
Once a year, soil pH will be tested and time will be added if necessary.
the filter strip is established, it will be inspected quarterly and within 24 hours
very storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
3s of operation and maintenance will be kept in a known set location and will be
ble upon request.
lion activities shall be performed as follows. Any problems that are-found shall
aired immediately.
v element: Potential problem: How I will rernediate the problem:
ntire filter strip Trash/debris is present. Remove the trash/debris.

`,splitter device The flow sputter device is Unclog the conveyance and dispose
tile) clogged. of an sediment off-site.
The flow sputter device is Make any necessary repairs or
\ damaged. replace if damage is too large for
re au.
, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
BMP element: Potential problem: How I will remediate the problem:
The swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo e of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
Permit Number:
(to be provided by DWQ)
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.
Project name:Ligon Mill Road Extension
BMP drainage area number:Level Spreaders - LS 1, LS2 and LS 3
Print name:Town of Wake Forest c/o Eric Keravuori
Title:Town Engineer
Address:401 Elm Avenue, Wake Forest, NC 27587
Phone: [phone]
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, , a Notary Public for the State of
County of , do hereby certify that
personally appeared before me this
day of and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
SEAL
My commission
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3

I ?0 WATpgO
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS. (NEXT WORKSHEET)I
I?, P.ROJECT,INFORMATION?kr N
Project name - LIGON MILL ROAD
Contact name MARTY BIZZELL
Phone number 919-645-2096
Date December 17, 2008
Drainage area number i
Ill.--DESIGN INFORMATION'? ' ..3?x ?v??? " u-7:»`?,.`?
For Level Spreaders Receiving Flow From a BMP
Type of BMP NIA
Drawdown flow from the BMP cis
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 imhr storm
Time of concentration
Rainfall intensity, 10-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge?
To a grassed biorelention cell?
To a mulched bioretermon cell?
To a wetland?
To a filter strip or riparian buffet?
Other (specify)
131,115.60 h'
48,787.20 ftz
37.21 %
0.72
( 2.17 cis
5.00 min
7.22 in/hr
15.65 cis
N (Y or N)
N (Y or N)
N (Y or N)
Y (Y or N)
N/A
Please caaplete filter strip characterization below.
Filter Strip or Riparian Buffer Characterization (if applicable)

Width of grass
0.00
`
ft tt
) 3 F? 0 7
LS /
-4 Width of dense ground cover 95.00 ft
Width of wooded vegetation 0.00 - - ft (o,5
Total width 95.00 it
Elevation at downslope base of level lip
f th
i
i
t
f b
k 291.00
283
50 fmsl
f
l 6o?a
a
an
o
e rece
v
ng wa
er
Elevation at top o . ms
Slope (from level lip to to top of bank) • 7.89 %
Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area 98.00 sq it OK
Feet of level lip needed per cis 13i fucfs
Answer "Y' to one of the following:
Length based on the 1 in/hr storm? Y (Y or N)
Length based on the 10-yr storm? N (Y or N)
Length based on the BMP discharge rate? N (Y or N)
Design flow 1.46 cis
Is a bypass device provided? Y (Y or N) OK
I ifs «o ?t Mtu
I c.Fs
Form SW401-1-evel Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 1 01`2
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material
M
29.00 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y (Y or N)
3.00 it
9.00 ft
1.00 ft
4.13 cis
NAG C350
t
M
B
Form SW401-Level Spreader, Filter Strip. Restored Ripedan Buffer-Rev.5 Parts I. and It Design Summary, page 2 of 2

111 =REQUIRED ITEMS CHECKLIST, erg` °
- _ --
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
MDB 1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Forebay (if applicable),
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.
MDB 2. Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
- High flow bypass system,
- One foot lope lines between the level lip and top of stream bank,
- Proposed drainage easement, and
- Design at ultimate build-out.
MDB 3. Section view of the level spreader (1" = 20' or larger) showing:
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
- Downslope filter fabric.
MDB 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
MDB 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
MDB 6. The supporting calculations.
MDB 7. A copy of the signed and notarized operation and maintenance (08M) agreement.
N/A 8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer- Rev. 5 Part III; page 1 of 1
Level Spreader 1-Buffer 12-09-08
Level Spreader 1-Exit 12-09-08
?A"
NCDENR
O=?4 WW?a?T?Fq?\?G
0
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET))
Project name LIGON MILL ROAD
Contact name MARTY BIZZELL
Phone number 919-645-2096
Date December 17, 2008
Drainage area number 2
For Level Spreaders Receiving Flow From a BMP
Type of BMP Grass Swale
Drawdown flow from the BMP 10.53 cfs
For Level Spreaders Receiving Flow from the Drainage Area Do not complete this section of the woftheet.
Drainage area 88,862.40 f' Do rot complete this section of the worksheet.
Impervious surface area 35,283.60 fts Do not wmpiete this section of the worksheet.
Percent impervious 39.71 % Do not complete this section of the worksheet.
Rational C coefficient 0.74 Do not complete this section of the worksheet.
Peak flow from the 1 in/hr storm 1.51 cfs Do wt complete this section of the worksheet.
Time of concentration 5.00 min
Rainfall intensity, 10-yr storm 7.22 in/hr Do not complete this section of the worksheet.
Peak flow from the 10-yr storm 10.90 cis Do wt complete this section of the worksheet.
Where Does the Level Spreader Discharge?
To a grassed bioretention cell? N (Y or N)
To a mulched bioretention cell? N (Y or N)
To a wetland? N (Y or N)
To a filter strip or riparian buffer? Y (Y or N) Please canplele filter strip characterization below.
Other (specify) N/A
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 0.00 It
Width of dense ground cover 0.00 it
Width of wooded vegetation 80.00 ft _
Total width 80.00 ft
Elevation at downslope base of level lip 279.00 fmsl?
Elevation at top of bank of the receiving water 270.00 first `
Slope (from level lip to to top of bank) 11.25 % Level spmaders must be paced in series,
Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area sq it No forebay is needed,
Feet of level lip needed per cfs 65 f /cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm? Y (Y or N)
Length based on the 10-yr storm? N (Y or N)
Length based on the BMP discharge rate? - N (Y or N)
Design flow 1.52 cfs
Is a bypass device provided? Y (Y or N) OK
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Pads I. and II. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material -
99.00 R Level spreader length OK.
N (Y or N)
N (Y or N)
Y (Y or N)
3.00 ft
3.00 ft
9.00 it
1.00 It
5.03 cfs
NAG C350

t Y
---- --------- _

M
i B
M
Form SW401-1-evel Spreader, Filler Strip, Restored Riparian Buffer-Rev.5 Parts I. and It, Design Summary, page 2 of 2
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
MDB 1. Plans (1" - 50' or larger) of the entire site showing:
Design at ultimate build-out,
Off-site drainage (if applicable), -
Delineated drainage basins (include Rational C coefficient per basin),
Forebay (if applicable),
High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.
MDB 2. Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
- High flow bypass system,
- One foot topo lines between the level lip and top of stream bank,
- Proposed drainage easement, and
- Design at ultimate build-out.
MDB 3. Section view of the level spreader (1" = 20' or larger) showing:
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
- Downslope filter fabric.
MDB 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
MDB 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
MDB 6. The supporting calculations.
MDB 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
N/A 8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.S Part III, page 1 of i
Level Spreader 2-Buffer 12-09-08
Level Spreader 2-Exit 12-09-08
?pf WAZFq `
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)I
N T'.5 F r<-^" Zn`. y bawl r} Sa .tr=.2 .?"i a'.r't5'.'vei?` s?1:..-t:.r-s'Sr ' a,m v.?
PROJECTINFORMATIONI •`3y k*[
yr..c.,aka• :_ .. r_ ?_ r47 .
Project name LIGON MILL ROAD
Contact name MARTY BIZZELL -
Phone number 919-645-2096
Date December 17, 2008
Drainage area number 3
115'DESIGN:INFORMATION,:,'y x`Va,
For Level Spreaders Receiving Flow From a BMP
Type of BMP Grass Swale
Drawdown flow from the BMP 13.32 cfs
For Level Spreaders Receiving Flow from the Drainage .Area Do not complete this section of the worksheet.
Drainage area 108,900.00 ff2 Do not complete this section of the worksheet.
Impervious surface area 37,026.00 it" Do not complete this section of the worksheet.
Percent impervious 34.00 % Do not complete this section of the worksheet.
Rational C coefficient 0.74 Do not complete this section of the worksheet.
Peak flow from the 1 in/hr storm 1.85 cfs Do net complete this secion of the worksheet.
Time of concentration 5.00 min
Rainfall intensity, l 0-yr storm 7.22 m/hr Do not complete this section of the worksheet.
Peak flow from the 10-yr storm 13.36 cis Do not complete this section of the worksheet.
Where Does the Level Spreader Discharge 7
To a grassed bioretention cell? N (Y or N)
To a mulched biorelenton cell? N (Y or N)
To a wetland? N (Y or N)
To a filter strip or riparian buffer? Y (Y or N) Please compete filter step charactenzation helow.
Other (specify) NIA
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 0.00 fl
Width of dense ground cover 100.00 ft
Width of wooded vegetation 30.00 it
-
Total width 130.00 It
Elevation at downslope base of level lip 284.00 fmsl
Elevation at top of bank of the receiving water 270.00 first
Slope (from level lip to to top of bank) 10.77 % Level spreaders must be paced in senes.
Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area sq It No Veber is needed.
Feet of level lip needed per cis 25 fllcfs
Answer •Y• to one of the following:
Length based on the 1 in/hr storm? Y (Y or N)
Length based on the 10-yr storm? N (Y or N) -
Length based on the BMP discharge rate? N (Y or N)
Design flow 1.84 cfs
Is a bypass device provided? Y (Y or N) OK
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material
1 ?----------
M
47.00 it Level spreader length OK.
N (Y or N)
N (Y or N)
Y (Y or N)
9.00 1
3.00 ft
3.00 ft
1.00 ft
6.21 cfs
NAG C350
B
W.?- :t
----------
M
Form SW401-Level Spreader, Filler Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 2 of 2
III°?RE(IUIRED,ITEMS CHECKLIST?? , ? ? ``r " ?? ?? `'?` `? "` Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
MDB 1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Forebay (if applicable),
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.
MDB 2. Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
- High flow bypass system,
- One foot topo lines between the level lip and top of stream bank,
- Proposed drainage easement, and
- Design at ultimate build-out.
MDB 3. Section view of the level spreader (1" = 20' or larger) showing:
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
- Downslope filter fabric.
MDB 4. A date-stamped photograph of the filter ship that clearly shows the type of vegetation that is present.
MDB 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
MDB 6. The supporting calculations.
MDB 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
N/A 8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of 1
Level Spreader 3-Buffer 12-09-08
Level Spreader 3-Exit 12-09-08
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC, 1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
system
The flow splitter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow sputter device is Make any necessary repairs or
damaged. replace if damage is too large for
repair.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
BMP element: Potential problem: How I will remediate the problem:
The swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo e of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabihze the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
Permit
(to be provided by DWQ)
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.
Project name:Ligon Mill Road Extension
BMP drainage area number:Level Spreaders - LS 1 LS2 and LS 3
Print name:Town of Wake Forest c/o Eric Keravuori
Title:Town Engineer
Address:401 Elm Avenue Wake Forest. NC 27587
Phone: [phone]
Signature:
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, , a Notary Public for the State of
County of , do hereby certify that
personally appeared before me this
day of and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
SEAL
My commission expires
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer 0&M-Rev.3 Page 3 of 3
WAKE FOREST CONSTRUCTION SEQUENCE
1. SCHEDULE A PRE-CONSTRUCTION CONFERENCE WITH THE ENVIRONMENTAL ENGINEER,
HOLLY SPRING. OBTAIN A LAND DISTURBING PERMIT.
2. INSTALL GRAVEL CONSTRUCTION PAD, TEMPORARY DIVERSIONS, SILT FENCE,
SEDIMENT BASINS OR OTHER MEASURES AS SHOWN ON THE APPROVED PLAN.
CLEAR ONLY AS NECESSARY TO INSTALL THESE DEVICES. SEED TEMPORARY
DIVERSIONS, BERMS AND BASINS IMMEDIATELY AFTER CONSTRUCTION.
3. CALL HOLLY SPRING FOR AN ONSITE INSPECTION BY THE ENVIRONMENTAL ENGINEER
TO OBTAIN A CERTIFICATE OF COMPLIANCE. -
4. BEGIN CLEARING AND GRUBBING. MAINTAIN DEVICES AS NEEDED. ROUGH GRADE SITE.
5. INSTALL STORM SEWER, IF SHOWN, AND PROTECT INLETS WITH HARDWARE CLOTH w/ STONE
INLET CONTROLS, SEDIMENT TRAPS OR OTHER APPROVED MEASURES
AS SHOWN ON THE PLAN. BEGIN CONSTRUCTION, BUILDING, ETC.
6. STABILIZE SITE AS AREAS ARE BROUGHT UP TO FINISH GRADE WITH VEGETATION,
PAVING, DITCH LININGS, ETC. SEED AND MULCH DENUDED AREAS WITHIN FIFTEEN (15)
DAYS OF COMPLETION OF ANY PHASE OF CONSTRUCTION.
7. WHEN CONSTRUCTION IS COMPLETE AND ALL AREAS ARE STABILIZED COMPLETELY,
CALL FOR AN INSPECTION BY THE ENVIRONMENTAL ENGINEER, HOLLY SPRING.
8. IF SITE IS APPROVED, REMOVE TEMPORARY DIVERSIONS, SILT FENCE, SEDIMENT
BASINS, ETC., AND SEED OUT OR STABILIZE ANY RESULTING BARE AREAS. ALL
REMAINING PERMANENT EROSION CONTROL DEVICES, SUCH AS VELOCITY DISSIPATORS,
SHOULD NOW BE INSTALLED.
9. WHEN VEGETATION HAS BECOME ESTABLISHED, CALL FOR A FINAL SITE INSPECTION BY
THE ENVIRONMENTAL ENGINEER, HOLLY SPRING. OBTAIN A CERTIFICATE OF COMPLETION.
EROSION CONTROL PERSONNEL OFFICE
HOLLY E. SPRING 919-554-3158
Permit Number:
(to be provided by DWO)
a^p W ATpq
Rm-
{A OIL___ \?G
A y1/1?yV?'r ?
WDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM o
401 CERTIFICATION APPLICATION FORM
GRASSED SWALE SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Pad III) must also be filled out, printed and submitted along with all of the required information.
I IP,RQJ EGhIN FORMATION
Project name Ligon Mill Road Extension
Contact name Bass, Nixon and Kennedy, Inc.
Phone number
Date
Drainage area number
919-645-2096
December 29, 2008
I IXDESIGNIIN FORMATION
Site Characteristics
Drainage area 88,862.00 ftz
Impervious area 35,284.00 ft1
Percent impervious 39.7%%
Design rainfall depth 5.38 inch
Peak Flow Calculations
10-yr storm runoff depth 5.38 in
10-yrstorm intensity 7.22 in/hr
Post-development 10-yr storm peak flow 10.96 ft3/sec
Velocity
Maximum non-erosive velocity (peak 10-year storm) 6.00 fUsec
Soil characteristics (enter Y below)
Sand/silt (easily erodible)
Clay mix (erosion resistant) X
Grass Type (enter 'Y' below)
Bermuda X
Tall fescue
Bahiagrass
Kentucky bluegrass
Grass-legume mixture
Swale type: Fill out one of the options below:
Option 1: Curb Outlet Swale: N (Y or N)
Maximum velocity
Side slopes :1
Swale length ft
Option 2: Conveyance Swale, 2: Conveyance SwaleSeekingPollutant CreditCredit: Y (Y or N)
Maximum velocity for 10-yr storm 1.00 fUsec OK
Side slopes 6.00 :1 OK
Swale length 150.00 ft OK
Form SW401-Grassed Swale-Rev.3 Parts I and II. Project Design Summary, Page 1 of 2
Permit Number:
(to be provided by DWQ)
Swale Characteristics
Swale Shape: Enter an 'Y' in the appropriate cell below:
Trapezoidal
Parabolic
V-shaped
Width of the bottom of the Swale
Width of the top of the Swale
Additional Information
Is the Swale sized for all runoff from ultimate build-out?
Is the BMP located in a proposed drainage easement with a
recorded access easement to a public Right of Way (ROW)?
What is the distance from the bottom of the Swale to the SHWT?
What is the ground level elevation?
What is the elevation of the bottom of the Swale?
What is the SHWT elevation?
What is the longitudinal slope of the swale?
What is the depth of freeboard?
X
8.00 It
20.00 It
YES (Y or N) OK
YES (Y or N) OK
4.50 It OK
284.50 fmsl
284.50 fmsl
280.00 fmsl
0.20% OK
0.50 It OK
Form SW401-Grassed Swale-Rev.3 Parts I and II. Project Design Summary, Page 2 of 2
Permit
(to be provided by DWO)
,rypJ{W^'AA7F,9\OG
oL/21/0
o\^
NC ENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM v
401 CERTIFICATION APPLICATION FORM
GRASSED SWALE SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part III) must also be filled out, printed and submitted along with all of the required information.
Project name
Contact name
Phone number
Date
Drainage area number
Mill Road Extension
Bass, Nixon and Kennedy, Inc.
919-645-2096
December 29, 2008
LS 3
11 V E S I G NII N F,O R MATiIO N
Site Characteristics
Drainage area 108,900.00 ft2
Impervious area 37,026.00 ftz
Percent impervious 34.0%%
Design rainfall depth 5.38 inch
Peak Flow Calculations
10-yr storm runoff depth
10-yr storm intensity
Post-development 10-yr storm peak flow
Velocity
Maximum non-erosive velocity (peak 10-year storm)
Soil characteristics (enter Y' below)
Sand/silt (easily erodible)
Clay mix (erosion resistant)
Grass Type (enter Y' below)
Bermuda
Tall fescue
Bahiagrass
Kentucky bluegrass
Grass-legume mixture
Swale type: Fill out one of the options below:
Option 1: Curb Outlet Swale:
Maximum velocity
Side slopes
Swale length
Ootion 2: Conveyance. Swale, Seekinq Pollutant Credit:
Maximum velocity for 10-yr storm
Side slopes
Swale length
5.38 in
7.22 in/hr
13.32 ft3/se
6.00 ft/sec
N (Y or N)
:1
It
Y (Y or N)
1.00 ft/sec OK
7.00 :1 OK
150.00 ft OK
Form SW401-Grassed Swale-Rev.3 Parts I and II. Project Design Summary, Page 1 of 2
Permit Number:
(to be provided by DWO)
Swale Characteristics
Swale Shape: Enter an "x" in the appropriate cell below:
Trapezoidal
Parabolic
V-shaped
Width of the bottom of the Swale
Width of the top of the Swale
Additional Information
Is the Swale sized for all runoff from ultimate build-out?
Is the BMP located in a proposed drainage easement with a
recorded access easement to a public Right of Way (ROW)?
What is the distance from the bottom of the Swale to the SHWT?
What is the ground level elevation?
What is the elevation of the bottom of the Swale?
What is the SHWT elevation?
What is the longitudinal slope of the Swale?
What is the depth of freeboard?
x
9.00 It
20.00 It
YES (Y or N) OK
YES (Y or N) OK
4.50 ft OK
284.50 fmsl
284.50 fmsl
280.00 fmsl
0.20% OK
0.50 It OK
Form SW401-Grassed Swale-Rev.3 Parts I and II. Project Design Summary, Page 2 of 2
Permit Name:
(to be provided by DWQ
Drainage Area Number:
Grassed Swale Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- The drainage area of the grassed swale will be carefully managed to reduce the
sediment load to the grassed Swale.
- After the first-time fertilization to establish the grass in the swale, fertilizer will
not be applied to the grassed swale.
The grassed swale will be inspected once a quarter. Records of operation and
maintenance will be kept in a known set location and will be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire length of the Trash/debris is present. Remove the trash/debris.
swale
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then re-sod
(or plant with other appropriate
species) and water until established.
Provide lime and a one-time
fertilizer application.
Sediment covers the grass at Remove sediment and dispose in an
the bottom of the swale. area that will not impact streams or
BMPs. Re-sod if necessary.
Vegetation is too short or too Maintain vegetation at a height of
long. approximately six inches.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality 401 Oversight Unit at 919-
outlet. 733-1786.
Form SW401-Grassed Swale O&M-Rev.3 Page 1 of 2
Permit Number:
(to be provided by DWQ)
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.
Project name:Ligon Mill Road Extension
BMP drainage area number:Grassed Swales LS 2 and LS3
Print name:Town of Wake Forest c/o Eric Keravuori
Title:Town Engineer
Address:401 Elm Avenue. Wake Forest. N.C. 27587
Phone: [phone]
Date:
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, , a Notary Public for the State of
County of , do hereby certify that
personally appeared before me this
day of and acknowledge the due execution of the
forgoing grassed swale maintenance requirements. Witness my hand and official seal,
SEAL
My commission
Form SW401-Grassed Swale 0&M-Rev.3 Page 2 of 2

j
NORTH AMERICAN GREEN EROSION CONTROL MATERIALS DESIGN SOFTWARE VERSION 4.3
NORTH AMERICAN GREEN CHANNEL PROTECTION - ENGLISH/S.I.
USER SPECIFIED CHANNEL LINING BACK-UP COMPUTATIONS
*****************************************************************************
PROJECT NAME: Ligon Mill Rd. LS 3 - Grassed Swale PROJECT NO.:
COMPUTED BY: BNK DATE: 12/23/2008
FROM STATION/REACH: TO STATION/REACH:
DRAINAGE AREA: DESIGN FREQUENCY:
*****************************************************************************
INPUT PARAMETERS
*****************************************************************************
Channel Discharge
Peak Flow Period
Channel Slope
Channel Bottom Width
Left Side Slope
Right Side Slope
13.3 cfs (.
6 hours
0.002 ft/ft
9.0 ft (2.74
7:1
7:1
38 m?3/s)
(0.002 m/m)
m)
Channel Lining : SC150 Staple D
Permi. Shear(Tp) :2.00 psf (95.8 Pa)
Phase = 0
*****************************************************************************
CALCULATIONS
*****************************************************************************
Initial Depth Estimate = 0.16 * (13.3 /(0.0020.5))-0.375 = 1.43 ft (.44 m)
Final Channel Depth (after 8 iterations) _ .88 ft'(0.27 m)
Flow Area = (9.0 * 0.9)+(0.5 *0.88A2 * (7.0+7.0)) = 13.3 sq.ft (1.2 mA2)
Wet Per. =9.0 +(0.9*(((7.0A2)+1)A.5 +((7.0A2)+1)A.5)) = 21.4 ft (6.5 m)
Hydraulic Radius = (13.3 / 21.4) = 0.6 ft (0.2 m)
Channel Velocity =(1.486/0.042)*(0.6A0.667)"*(0.002?.5) = 1.0 fps (0.3 m/s)
Channel Effective Manning's Roughness = 0.042
Calculated Shear (Td) = 62.4 * 0.88 * 0.002 = 0.08 psf (3.9 Pa)
Safety Factor = (Tp/Td) _ (2.00 /0.08) = 24.32
ndh Arneri-Oreea-FCUOS Vcrcian 43 122-n2o MPt ITPRRY RNK
O.IFCT NAMF'Ii.- Mill Rd lR3-f,-H Sumla PRO.IFCT NO'
OMSTATIMIRFA( OSTATIf1NIRFAf RAINArF ARFA FG(',N FRFOI IFN(
HYDRAULIC RESUI U
isdrerg

(d.) Peek

R. Velocity

pps)
bee
(sq X)
Hydraulic
Radius(M1)
Normd
Depth M
133 6.0 1.00 13 31 0.62 0.88
SC150 n= 042
L 5q 0.0015
1 ] 0 wIrThon O1
Not to Scele

Reach Mening Type
Slnbiliy Vegelelion Chmederistics
Cdale
Remarks
Slagle Aneysis hme Gass Type ensi Permissible Sheer
Sheer Fodor
Factor
Strdght SC15U Unvogatato 2.00 0.08 2432 STABLE
Staple D
Beckto Input Sveen

NORTH AMERICAN GREEN EROSION CONTROL MATERIALS DESIGN SOFTWARE VERSION 4.3
NORTH AMERICAN GREEN CHANNEL PROTECTION - ENGLISH/S.I.
USER SPECIFIED CHANNEL LINING BACK-UP COMPUTATIONS
*****************************************************************************
PROJECT NAME: Ligon Mill Rd. LS 2 PROJECT NO.:
COMPUTED BY: BNK DATE: 12/23/2008
FROM STATION/REACH: TO STATION/REACH:
DRAINAGE AREA: DESIGN FREQUENCY:
*****************************************************************************
INPUT PARAMETERS
*****************************************************************************
Channel Discharge : 11.0 cfs (.31 m?3/s)
Peak Flow Period : 6 hours
channel Slope : 0.002 ft/ft (0.002 m/m)
Channel Bottom Width : 8.0 ft (2.44 m)
Left Side Slope : 6:1
Right Side Slope : 6:1
Channel Lining : SC150 Staple D
Permi. Shear(Tp) :2.00 psf (95.8 Pa)
Phase = 0
*****************************************************************************
CALCULATIONS
*****************************************************************************
Initial Depth Estimate = 0.16 * (11.0 /(0.002-0.5))A0.375 = 1.33 ft (.41 m)
Final Channel Depth (after 9 iterations) _ .86 ft (0.26 m)
Flow Area = (8.0 * 0.9)+(0.5 *0.86A2 * (6.0+6.0)) = 11.3 sq.ft (1.0 MA2)
Wet Per. =8.0 +(0.9*(((6.0A2)+1)A.5 +((6.0^2)+l)A.5)) = 18.4 ft (5.6 m)
Hydraulic Radius = (11.3 / 18.4) = 0.6 ft (0.2 m)
Channel Velocity =(1.486/0.042)*(0.6A0.667)*(0.002A.5) = 1.0 fps (0.3 m/s)
Channel Effective Manning's Roughness = 0.042
Calculated Shear (Td) = 62.4 *.0.86 * 0.002 = 0.08 psf (3.8 Pa)
Safety Factor = (Tp/Td) _ (2.00 /0.08) = 24.95
kf DRAULIE RESULTS
mctiarg
(tls) Peek
now Velocity
1 s) Area
s h kydmubc
Redius(11) Narmol
De th PO.
11.0 6.0 099 11.25 0.61 0.96
FSO 50 0-0 042)
S - 0.0015
1 WdIM,00 X 6.01
Notto Scele

h
R Marling Type
SlnLiliy Vegeialiom Chamderislics
Cdculated
Selety
Remarks
eac Steele Amelysis hm Class Type ensi Permissible She. Fedor
Straight SC150 l/mvegelato 2.00 0.08 2495 STABLE
Sleple D
Backb Impul Scree.
i
i
I
i
(NORTH AMERICAN GREEN EROSION CONTROL MATERIALS. DESIGN SOFTWARE VERSION 4.3
NORTH AMERICAN GREEN CHANNEL PROTECTION - ENGLISH/S.I.
USER SPECIFIED CHANNEL LINING BACK-UP COMPUTATIONS
PROJECT NAME: Ligon Mill Rd. Ext. - LS 1 PROJECT NO.: 04-08043
COMPUTED BY: Bass, Nixon and Kennedy, Inc. DATE: 12/18/2008
FROM STATION/REACH: TO STATION/REACH:
DRAINAGE AREA: DESIGN FREOUENCY:

INPUT 1 ?? ss

CNAN?/?L
Channel Discharge 9.1 cfs
Gf'LGS
Peak Flow Period 6 hours
Channel Slope 0.084 ft/
Channel Bottom Width : 3.0 ft (.
Left Side Slope : 3:1
Right Side Slope : 3:1

*************************
Channel Lining : C350 Staple E Mix 50-751
6ermi. Shear(Tp) :9.00 psf (430.9 Pa)
Phase = 3
Class = D Vegetation
Soil = Clay Loam
Allowable Soil Shear(Ta):1.2 psf (57.4560022830963 Pa)
CALCULATIONS
*****************************************************************************
Initial Depth Estimate = 0.16 * (9.1 /(0.084"0.5))"0.375 = 0.58 ft (.18 m)
Final Channel Depth (after 7 iterations) _ .49 ft (0.15 m)
Flow Area = (3.0 * 0.5)+(0.5 *0.49"2 * (3.0+3.0)) = 2.2 sq.ft (0.2 m"2)
Wet Per. =3.0 +(0.5*(((3.0"2)+1)".5 +((3.0"2)+l)".5)) = 6.1 ft (1.9 m)
Hydraulic Radius = (2.2 / 6.1) = 0.4 ft (0.1 m)
Channel Velocity =(1.486/0.053)*(0.4"0.667)*(0.084".5) = 4.1 fps (1:3 m/s)
Channel Effective Manning's Roughness = 0.053
Calculated Shear (Td) = 62.4 * 0.49 * 0.084 = 2.59 psf (123.8 Pa)
Safety Factor = (Tp/Td) _ (9.00 /2.59) = 3.48
Effective Stress on Blanket(Te) = 2.6*(1-0.60)*(/0.053)"2 = 0.62 psf (29.8 Pa)
Safety Factor = (Ta/Te) _ (1.20 /0.622) = 1.93
FJYDRAU IC RESULTS
isa.g
(ds) Peak
Fl.w VelDdty
(fps) Men
s M HydmDlic
Rodi (ft NDrmel
Depth (fl)
9.1 60 4,13 2.20 0.3fi 0.49
C35
S•00842
1
1 3.0Wd:M1 X0011 30
Not to SWe

R
ch M9Wn]Type
Slabiliy egetobon ChwaLlensLCS
Cdcvlated
Saley
marks
ea Staple Maysis es Dans Type ensi ermissibI Shem Factor I
Straight 0350 Vegeta4Dn 3 D Ma 50.75 900 2.59 3.40 ABLE
i
StapleE Soil day LDam 1200 0622 1.93 ABLE
Backto Input Sveen
)RTH AMERICAN GREEN EROSION CONTROL MATERIALS DESIGN SOFTWARE VERSION 4.3
)RTH AMERICAN GREEN CHANNEL PROTECTION - ENGLISH/S.I.
;ER SPECIFIED CHANNEL LINING BACK-UP COMPUTATIONS
I
PPROJECT NAME: Ligon Mill Rd. Ext. - LS 2 PROJECT NO.: 04-08043
ICOMPUTED BY: Bass, Nixon and Kennedy, Inc. DATE: 12/18/2008
FROM STATION/REACH: TO STATION/REACH:
DRAINAGE AREA: DESIGN FREQUENCY:
i
****************************************************************************
INPUT PARAMETERS
Channel Discharge
Peak Flow Period
Channel Slope
Channel Bottom Width
Left side slope
Right Side slope
9.4 cfs (.27 m?3/s)
6 hours
0.133 ft/ft (0.133 m/m)
3.0 ft (.91 m)
3:1
3:1
Channel Lining : C350 Staple E Mix 50-751
Permi. Shear(Tp) :9.00 psf (430.9 Pa)
Phase = 3
Class = D Vegetation
Soil = Clay Loam
Allowable Soil Shear(Ta):1.2 psf (57.4560022830963 Pa)
CALCULATIONS
*****************************************************************************
Initial Depth Estimate = 0.16 * (9.4 /(0.133_0.5))0.375 = 0.54 ft (.16 m)
Final Channel Depth (after .8 iterations) _ .43 ft (0.13 m)
Flow Area = (3.0 * 0.4)+(0.5 *0.43?2 * (3.0+3.0)) = 1.9 sq.ft (0.2 mA2)
Wet Per. =3.0 +(0.4*(((3.0?2)+1)A.5 +((3.0 2)+1)A.5)) = 5.7 ft (1.8 m)
Hydraulic Radius = (1.9 / 5.7) = 0.3 ft (0.1 m)
Channel Velocity =(1.486/0.051)*(0.3?0.667)*(0.133?.5) = 5.0 fps (1.5 m/s)
Channel Effective Manning's Roughness = 0.051
Calculated Shear (Td) = 62.4 * 0.43 * 0.133 = 3.61 psf (172.8 Pa)
Safety Factor = (Tp/Td) _ (9.00 /3.61) = 2.49
Effective Stress on Blanket(Te) = 3.6*(1-0.60)*(/0.051)A2 = 0.94 psf (44.8 Pa)
Safety Factor = (Ta/Te)-= (1.20 /0.936) = 1.28
:r,
HYDRAULIC RESULT
m *,g
(ds) Peek
now Velpdy
(fps) Psee
(sq n) Hydraulic
Radius(X) Normal
Depth 17
PA 6 0 5.03 137 0.33 OA3
0350 n• 051
S - 0,1330
30 wAR"•°9oon 3D1
Not to Sc e

Re
ch Manieg Type
l
iy V. getatioe Cheiedeiistics
Cdc
Selety
Ramatks
a Slapr
?ffpn t,ly
Anelsls hose Class Type onsi Permissible Sh.t,' heer Feaor
Shaight 0350 Vegotelion 2 D Mix 50-75 900 3.60 2.50 STPBLE
StapleE Soil qey LOem 30110 0.935 321 STPBLE
Bed to Input Sveen
NORTH AMERICAN GREEN EROSION CONTROL MATERIALS DESIGN SOFTWARE VERSION 4.3
NORTH AMERICAN GREEN CHANNEL PROTECTION - ENGLISH/S.I.
USER SPECIFIED CHANNEL LINING BACK-UP COMPUTATIONS
*****************************************************************************
PROJECT NAME: Ligon Mill Rd. Ext. - LS 3 PROJECT NO.: 04-08043
COMPUTED BY: Bass, Nixon and Kennedy, Inc. DATE: 12/18/2008
FROM STATION/REACH: TO STATION/REACH:
DRAINAGE AREA: DESIGN FREQUENCY:
*****************************************************************************
INPUT PARAMETERS
*****************************************************************************
Channel Discharge : 11.5 cfs (.33 m"3/s)
Peak Flow Period : 6 hours
Channel Slope : 0.177 ft/ft (0.177 m/m)
Channel Bottom Width : 3.0 ft (.91 m)
Left Side Slope : 3:1
Right Side Slope : 3:1
Channel Lining : C350 Staple E Mix 50-75°1
Permi. Shear(Tp) :9.00 psf (430.9 Pa)
Phase = 3
Class = D Vegetation
Soil = Clay Loam
Allowable Soil Shear(Ta):1.2 psf (57.4560022830963 Pa)
CALCULATIONS
*****************************************************************************
Initial Depth Estimate = 0.16 * (11.5 /(0.177"0.5))"0.375 = 0.55 ft (.17 m)
Final Channel Depth (after 8 iterations) _ .43 ft (0.13 m)
Flow Area = (3.0 * 0.4)+(0.5 *0.43"2 * (3.0+3.0)) = 1.9 sq.ft (0.2 m"2)
Wet Per. =3.0 +(0.4*(((3.0"2)+1)".5 +((3.0"2)+1)".5)) = 5.7 ft (1.7 m)
Hydraulic Radius = (1.9 / 5.7) = 0.3 ft (0.1 m)
Channel Velocity =(1.486/0.047)*(0.3"0.667)*(0.177".5) = 6.2 fps (1.9 m/s)
Channel Effective Manning's Roughness = 0.047
Calculated Shear (Td) = 62.4 * 0.43 * 0.177 = 4.75 psf (227.3 Pa)
Safety Factor = (Tp/Td) _ (9.00 /4.75) = 1.90
Effective Stress on Blanket(Te) = 4.7*(1-0.60)*(/0.047)"2 = 1.43 psf (68.3 Pa)
;Safety Factor = (Ta/Te) _ (1.20 /1.426) = 0.84
HYDRAULIC REWLT-s
ischarg
(ds) Peek
Flow Vel-tity
(,Ps) Are-
(sq n) Hydraulic
Radwu ft Normal
Depth
11.5 60 b 2l I .H5 0.32 0.93
M50 n• 04
5-0.1765
Fl?
30AtR"•°9'oan 3,0
1
Not to Scale

R
ch Mailing Type
Stability /egelaiian Chaiederistics
Celcul-ted
Salety
Remetks
ea Staple Analysis has Class Typa ensi Permissible She., Fador
SUeight Q5U Vogota4on ? D Mix 5U-75 900 4.75 1.90 STABLE
SmpleE Sail day Loem 1200 1,426 OB9 UNSTABLE
Back b Input Sveen
BASS, NIXON & KENNEDY, INC. DATE 7- D IOBNO. 04-08093
CONSULTING ENGINEERS
? 6310 CHAPEL HILL ROAD, STE. 250, RALEIGH, NC 27607 JOB UGOnI
TEL: [phone], FAX: [phone]
3 O 3319 HERITAGE TRADE DRIVE, SUITE 201, WAKE FOREST, NC 27587 1 Square= Ft.
TEL: [phone], FAX: [phone]
i
i
TO-YID- L. Ai
CA, - 0. q ? AcC :
C a 85- (0,4 q)IIt- O-B (0- s)?/OJ - _?
crNi. rI?E i 1-41 A-c?05(0.17)i t O';5(O fa?? 10,8(0,32-)]??,`?1? (nq
I ? 1-O?-T1 L. Y1' i
t - ' --
C0s5(0.4:0 t 5 olTL
I
l I ? ? I
7Q r - -
- F--
BASS, NIXON & KENNEDY, INC. DATE ) Z bojo22 loB No. 04-06043
CONSULTING ENGINEERS
NllC-t /ZD CX 1?
? 6310 CHAPEL HILL ROAD, STE. 250, RALEIGH, NC 27607 JOB 1-160/11
TEL: [phone], FAX: [phone] LE vl?-!_. SC'i?f/I Z%E=!<. CA LG5
j ? 3319 HERITAGETRADE DRIVE, SUITE 201, WAKE FOREST, NC 27587 1 Square = Ft.
l TEL: [phone], FAX: [phone]

--- 1 , !

1?e ?loUS
I I Az? = ZO . -O;Og I•I2- 1 9L

I ? i
I I ,

IN I

i
LS-3 ! I
i
i i I
?
'
rrxviovs Ah -' ; .

--
I

I '
-
-- I
-- ;-
i

! I ?
i I i

! I -
I i
I
I

I ?

I

I ; I I
i I

.._
I
I
..

1 !
' i
I i
I
I '
i I 1
i
i
I I
I

_ I I
i I !
I I I i
? I I
? ? _
I •,. I

I
I
_. _..._ _. _ -__.......___ i_.

j --.
I 1.. ..
i

1
I
CONSTRUCTION SEQUENCE
1. SCHEDULE A PRE-CONSTRUCTION CONFERENCE WITH THE
ENVIRONMENTAL ENGINEER.
2. INSTALL GRAVEL CONSTRUCTION ENTRANCES, TEMPORARY
DIVERSIONS, SILT FENCE, SEDIMENT BASINS OR OTHER
MEASURES AS SHOWN ON THE APPROVED PLAN. CLEAR ONLY AS
NECESSARY TO INSTALL THESE DEVICES. SEED TEMPORARY
DIVERSIONS, BERMS AND BASINS IMMEDIATELY AFTER
CONSTRUCTION.
3. CALL ENVIRONMENTAL ENGINEER FOR AN ONSITE INSPECTION BY
THE ENVIRONMENTAL ENGINEER TO OBTAIN A CERTIFICATE OF
COMPLIANCE.
4. BEGIN CLEARING AND GRUBBING.
5. TAKE SPECIAL NOTE TO STAY WITHIN THE LIMITS OF PERMITTED
PERMITED PERMANENT AND TEMPORARY IMPACT AREAS.
6. BEGIN INSTALLATION OF STREAM CULVERTS. INSTALL A PUMP
AROUND SYSTEM AT EACH CROSSING CONSISTING OF A
SUITABLE SIZED PUMP AND COFFER DAM.
7. INSTALL STORM SEWER, IF SHOWN, AND PROTECT INLETS WITH
HARDWARE CLOTH W/STONE AS SHOWN ON THE PLAN, BEGIN
CONSTRUCTION, BUILDING, ETC.
8. STABILIZE SITE AS AIRES ARE BROUGHT UP TO FINISH GRADE
WITH VEGETATION, PAVING, DITCH LININGS, ETC. SEED AND
MULCH DENUDED AREAS WITHIN 15 DAYS OF COMPLETION OF
ANY PHASE OF CONSTRUCTION.
9. ONCE ALL UPSTREAM AREAS HAVE BEEN STABLIZED, INSTALL
GRASSED SWALES AND LEVEL SPREADERS PER APPROVED PLAN.
INLETS SHOULD REMAIN PROTECTED TO ENSURE SEDIMENT
DOES NOT ENTER INTO THE GRASSED SWALES OR LEVEL
SPREADERS.
10. WHEN CONSTRUCTION IS COMPLETE AND ALL AREAS ARE
STABILIZED COMPLETELY, CALL FOR AN INSPECTION BY THE
ENVIRONMENTAL ENGINEER.
11. IF SITE IS APPROVED, REMOVE TEMPORARY DEVERSIONS, SILT
FENCE, SEDIMENT BASINS, ETC., AND SEED OUT OR STABILZE
ANY RESULTING BARE AREAS. ALL REMAINING PERMANENT
EROSION CONTROL DEVICES, SUCH AS VELOCITY DISSIPATORS
SHOULD NOW BE INSTALLED.
12. WHEN VEGETATION HAS BECOME ESTABLISHED, CALL FOR A
FINAL SITE INSPECTION BY THE ENVIRONMENTAL ENGINEER.
OBTAIN A CERTIFICATE OF COMPLIANCE.
r,
11
a
__�_ _ - i i_ 'rP '.
� - � �..
rK � to .y.. -..
_ , .sst=-
_. - '�'�
:j b
,.
:=-i'
;.
_ -�r ��
:, -

ARA-
NCDENR
North Carolina Department of Environment and Natural Resources
Beverly Eaves Perdue
Governor
Division of Water Quality
Coleen H. Sullins
Director
Dee Freeman
Secretary
May 12 2009
Wake County
NCDWQ Project No. 20030570 v.3
Ligon Mill Road Extension
APPROVAL of 401 WATER QUALITY CERTIFICATION and NEUSE BUFFER AUTHORIZATION,
with ADDITIONAL CONDITIONS
Alan R. Kofoed
Weingarten Investments, Inc.
2600 Citadel Plaza Drive
Houston, TX 77008
Dear Mr. Kofoed:
You have our approval, in accordance with the conditions listed below, for the following impacts for the purpose of
extending Town of Wake Forest's Ligon Mill Road in Wake County:
Stream Impacts in the Neuse River Basin
Site Permanent Fill in
Intermittent Stream
linear ft Temporary impact to
Intermittent Stream
linear ft Permanent Fill in
Perennial Stream
linear ft Temporary Impact
to Perennial
Stream linear ft Total Stream
Impact
linear ft
A 0 0 149 56 205
B 46 20 134 20 220
C 0 0 148 47 195
Total 46 20 431 123 620
Total Stream Impact for Project: 620 linear feet.
Neuse Riparian Buffer Impacts
Site Zone 1 minus = Zone 1 Zone 1 Buffer Zone 2 minus = Zone 2 Zone 2 Buffer
Impact Wetlands Buffers (not Mitigation Impact Wetlands Buffers Mitigation

(sq ft)
in Zone 1
wetlands)
Required ysY
?w (sq ft)
in Zone 2
(not
Required (using
(sq ft) (sq ft) (using 3:1 ratio) (sq ft) wetlands) 1.5:1 ratio)
s ft
A 7190 0 7190 N/A 4417 0 4417 N/A
B 8831 0 8831 N/A v? 4938 0 4938 N/A
C 7732 0 7732 N/A ?i 5374 0 5374 N/A
D 462 0 462 N/A 2859 0 2859 N/A
E 0 0 0 N/A x 6545 0 6545 N/A
s
Totals 24215 0 24215 0 24133 0 24133 0
* n/a = Total for Site is less than 1 /3 acre and 150 linear feet of impact, no mitigation required
Total Buffer Impact for Project: 48,348 square feet.
Transpodation Permitting Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
Location: 2321 Crabtree Blvd., Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone]
Internet: http:Iih2o.enrslate.nausinmetlandsl
One
NorthCarolina
Naturally
An Equal Opportunity \ Affirmative Acton Employer
The project shall be constructed in accordance with your application dated received December 31, 2008 and revised
information received April 22, 2009. After reviewing your application, we have decided,that these impacts are
covered by General Water Quality Certification Number 3704. This certification corresponds to the Nationwide
Permit 14 issued by the Corps of Engineers. This approval is also valid for the Neuse Riparian Buffer Rules (15A
NCAC 213.0233). In addition, you should acquire any other federal, state or local permits before you proceed with
your project including (but not limited to) Sediment and Erosion Control, Non-Discharge and Water Supply
Watershed regulations. This approval will expire with the accompanying 404 permit.
This approval is valid solely for the purpose and design described in your application (unless modified below).
Should your project change, you must notify the NCDWQ and submit a new application. If the property is sold, the
new owner must be given a copy of this Certification and approval letter, and is thereby responsible for complying
with all the conditions. If total wetland fills for this project (now or in the future) exceed one acre, or of total
impacts to streams (now or in the future) exceed 150 linear feet, compensatory mitigation may be required as
described in 15A NCAC 2H.0506 (h) (6) and (7). Additional buffer impacts may require compensatory mitigation.
For this approval to remain valid, you must adhere to the conditions listed in the attached certification as well as
those listed below.
Conditions of Certification:
1. No construction or impacts of any kind related to this project may start until DWQ receives the completed signed
and notarized Operation and Maintenance Agreement from the Town of Wake Forest for the stormwater treatment
devices.
2. Placement of culverts and other structures in waters, streams, and wetlands shall be placed below the elevation of
the streambed by one foot for all culverts with a diameter greater than 48 inches, and 20 percent of the culvert
diameter for culverts having a diameter less than 48 inches, to allow low flow passage of water and aquatic life.
Design and placement of culverts and other structures including temporary erosion control measures shall not be
conducted in a manner that may result in dis-equilibrium of wetlands or streambeds or banks, adjacent to or upstream
and down stream of the above structures. The applicant is required to provide evidence that the equilibrium is being
maintained if requested in writing by NCDWQ. If this condition is unable to be met due to bedrock or other limiting
features encountered during construction, please contact NCDWQ for guidance on how to proceed and to determine
whether or not a permit modification will be required.
3. If multiple pipes or barrels are required, they shall be designed to mimic natural stream cross section as closely as
possible including pipes or barrels at flood plain elevation and/or sills where appropriate. Widening the stream
channel should be avoided. Stream channel widening at the inlet or outlet end of structures typically decreases water
velocity causing sediment deposition that requires increased maintenance and disrupts aquatic life passage.
4. Riprap shall not be placed in the active thalweg channel or placed in the streambed in a manner that precludes
aquatic life passage. Bioengineering boulders or structures should be properly designed, sized and installed.
5. For all streams being impacted due to site dewatering activties, the site shall be graded to its preconstruction
contours and revegetated with appropriate native species.
6. A copy of the final construction drawings shall be furnished to NCDWQ Central Office prior to the pre-
construction meeting. The permittee shall provide written verification that the final construction drawings comply
with the permit drawings contained in the application dated December 31, 2008 and revised April 21, 2009. Any
deviations from the approved drawings are not authorized unless approved by the NC Division of Water Quality.
Additionally, the permittee must also notify DWQ once construction begins on the project.
7. All stormwater runoff shall be directed as sheetflow through stream buffers at nonerosive velocities, unless
otherwise approved by this certification.
8. All riparian buffers impacted by the placement of temporary fill or clearing activities shall be restored to the
preconstruction contours and revegetated. Maintained buffers shall be permanently revegetated with non-woody
species by the end of the growing season following completion of construction. For the purpose of this condition,
maintained buffer areas are defined as areas within the transportation corridor that will be subject to regular public
road maintenance activities including mowing. The area with non-maintained buffers shall be permanently revegetated
with native woody species before the next growing season following completion of construction.
9. Pursuant to NCAC15A 2B.0233(6), sediment and erosion control devices shall not be placed in Zone 1 of any
Neuse Buffer without prior approval by NCDWQ. At this time, NCDWQ has approved no sediment and erosion
control devices in Zone 1, outside of the approved project impacts, anywhere on this project. Moreover, sediment and
erosion control devices shall be allowed in Zone 2 of the buffers provided that Zone 1 is not compromised and that
discharge is released as diffuse flow.
10. If concrete is used during construction, a dry work area shall be maintained to prevent direct contact between
curing concrete and stream water. Water that inadvertently contacts uncured concrete shall not be discharged to
surface waters due to the potential for elevated pH and possible aquatic life and fish kills.
11. During the construction of the project, no staging of equipment of any kind is permitted in waters of the U.S., or
protected riparian buffers.
12. The dimension, pattern and profile of the stream above and below the crossing shall not be modified.
Disturbed floodplains and streams shall be restored to natural geomorphic conditions.
13. The use of rip-rap above the Normal High Water Mark shall be minimized. Any rip-rap placed for stream
stabilization shall be placed in stream channels in such a manner that it does not impede aquatic life passage.
14. The Permittee shall ensure that the final design drawings adhere to the permit and to the permit drawings
submitted for approval.
15. All work in or adjacent to stream waters shall be conducted in a dry work area. Approved BMP measures from
the most current version of NCDOT Construction and Maintenance Activities manual such as sandbags, rock berms,
cofferdams and other diversion structures shall be used to preverit excavation in flowing water.
16. Heavy equipment shall be operated from the banks rather than in the stream channel in order to minimize
sedimentation and reduce the introduction of other pollutants into the stream.
17. All mechanized equipment operated near surface waters must be regularly inspected and maintained to prevent
contamination of stream waters from fuels, lubricants, hydraulic fluids, or other toxic materials.
18. No rock, sand or other materials shall be dredged from the stream channel except where authorized by this
certification.
19. Discharging hydroseed mixtures and washing out hydroseeders and other equipment in or adjacent to surface
waters is prohibited.
20. The permittee and its authorized agents shall conduct its activities in a manner consistent with State water quality
standards (including any requirements resulting from compliance with §303(d) of the Clean Water Act) and any other
appropriate requirements of State and Federal law. If NCDWQ determines that such standards or laws are not being
met (including the failure to sustain a designated or achieved use) or that State or federal law is being violated, or that
further conditions are necessary to assure compliance, NCDWQ may reevaluate and modify this certification.
21. A copy of this Water Quality Certification shall be maintained on the construction site at all times. In addition,
the Water Quality Certification and all subsequent modifications, if any, shall be maintained with the on-site project
manager.
22. The outside buffer, wetland or water boundary located within the construction corridor approved by this
authorization shall be clearly marked by highly visible fencing prior to any land disturbing activities. Impacts to areas
within the fencing are prohibited unless otherwise authorized by this certification.
23. The issuance of this certification does not exempt the Permittee from complying with any and all statutes, rules,
regulations, or ordinances that may be imposed by other government agencies (i.e. local, state, and federal) having
jurisdiction, including but not limited to applicable buffer rules, stormwater management rules, soil erosion and
sedimentation control requirements, etc.
24. The Permittee shall report any violations of this certification to the Division of Water Quality within 24 hours of
discovery.
25. Upon completion of the project (including any impacts at associated borrow or waste sites), the project manager
shall complete and return the enclosed "Certification of Completion Form" to notify NCDWQ when all work included
in the 401 Certification has been completed.
26. Native riparian vegetation (i.e., trees and shrubs native to your geographic region) must be reestablished within
the construction limits of the project by the end of the growing season following completion of construction.
27. There shall be no excavation from, or waste disposal into, jurisdictional wetlands or waters associated with this
permit without appropriate modification. Should waste or borrow sites, or access roads to waste or borrow sites, be
located in wetlands or streams, compensatory mitigation will be required since that is a direct impact from road
construction activities.
28. Erosion and sediment control practices must be in full compliance with all specifications governing the proper
design, installation and operation and maintenance of such Best Management Practices in order to protect surface
waters standards:
a. The erosion and sediment control measures for the project must be designed, installed, operated, and
maintained in accordance with the most recent version of the North Carolina Sediment and Erosion
Control Planning and Design Manual.
b. The design, installation, operation, and maintenance of the sediment and erosion control measures
must be such that they equal, or exceed, the requirements specified in the most recent version of the
North Carolina Sediment and Erosion Control Manual. The devices shall be maintained on all
construction sites, borrow sites, and waste pile (spoil) projects, including contractor-owned or leased
borrow pits associated with the project.
C. For borrow pit sites, the erosion and sediment control measures must be designed, installed, operated,
and maintained in accordance with the most recent version of the North Carolina Surface Mining
Manual.
d. The reclamation measures and implementation must comply with the reclamation in accordance with
the requirements of the Sedimentation Pollution Control Act.
29. Sediment and erosion control measures shall not be placed in wetlands or waters unless otherwise approved by
this Certification.
If you do not accept any of the conditions of this certification, you may ask for an adjudicatory hearing. You must act
within 60 days of the date that you receive this letter. To ask for a hearing, send a written petition that conforms to
Chapter 150B of the North Carolina General Statutes to the Office of Administrative Hearings, 6714 Mail Service
Center, Raleigh, N.C. 27699. This certification and its conditions are final and binding unless you ask for a hearing.
This letter completes the review of the Division of Water Quality under Section 401 of the Clean Water Act. If you
have any questions, please contact Rob Ridings at 919-733-9817. '
Sincerely,
Coleen H. Sullins
r?4V Director
Cc: Debbie Edwards, Soil & Environmental Consultants
Jamie Shem, US Army Corps of Engineers, Raleigh Field Office
NCDWQ Raleigh Regional Office
File Copy