20080355 Ver 1_More Info Received_20080418

Re: Little Alamance Creek and Brown Branch
D~-r~~55
Subject: Re: Little Alamance Creek and Brown Branch
From: Salam Murtada <[e-mail]>
Date: Fri, 18 Apr 2008 15:30:33 -0400
To: Eric Kulz <[e-mail]>
CC: Kristie Corson <[e-mail]>
Eric,
Please find attached responses for your comments. Arcadis stated that re-inforced
grass matting is proposed to increase design shear stress which will be sufficient
for the given 10-year storm discharge. Based on Part Three of the checklist, items
7 and 8 are still pending. Kristie Corson, EEP project manager is working with the
town to obtain the operation and maintenance agreement. Also, the option agreement
is not yet finalized due to on-going easement negotiations with the city. Please
let me know if this will be fine for the issuance of the permit. If you have any
questions or need further information, please let me know. I will send hard copies
by mail. Thanks!
Salam
Eric Kulz wrote:
Salam;
Just following up on these projects. I think you said your designers were going
to look at the level spreaders and the slope issues.
Any info so far?
Eric
Salam Murtada, PE, CFM
Design and Construction Unit
Ecosystem Enhancement Program
Work Phone: [phone]
Fax: [phone]
L Alamance and Brown Branch DWQ Response.pdf
Content-Type: application/pdf
Content-Encoding: base64
1 of 1 4/25/2008 8:23 AM

ARCADIS
Infrastructure, environment, facilities
Ms. Kristie Corson
North Carolina Ecosystem Enhancement Program
2728 Capital Blvd, Suite 1 H 103
Raleigh North Carolina 27604
Subject:
Little Alamance Creek Stream Restoration Project (DWQ #08-0324)
Brown Branch Stream Restoration Project (DWQ #08-0355)
Alamance County
Dear Ms. Corson:
This letter is being sent to address the North Carolina Division of Water Quality's
(DWQ) comments and supply the additional information requested in their letter
dated March 12, 2008. DWQ's comments are shown in italic, our response follows
the comment.
!t was not clear that the level spreaders were of suffrcient length fo discharge to the
forested filter strip. Our calculations considered the filter strip to consist of heavy
ground cover, not forested.
Normally for such projects... the required items. The completed BMP Supplemental
Forms are attached.
!n addition, our engineer...for diffused flow. The maximum slope downstream of any
of the level spreaders is 6.7%. This is below the maximum allowable slope of 8.0%.
Please feel free to contact me if you have any additional questions.
Sincerely,
ARCADIS G&M of North Carolina,
Inc.
801 Corporate Center Drive
Suite 300
Raleigh
North Carolina 27607
Tet 919.854.1282
Fax [phone]
v+ww.arpdis-us.com
TRANSPORTATION
Date:
April 9, 2008
Contact:
Robert Lepsic
Phone:
919-854-1282
Emall:
robert.lepsic@arcad is-
us.com
Our ret:
N 0607003.0000
ARCADIS G8~M of North Carolina, Inc,
o ert epslc
Senior Scientist
Copies:
File
Imagine the result
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STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, i+ILTER STRIP AND RESTQRED RIPARIAN BUFFER SUPPLEMENT
This foml must be completely frrled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED REMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)t
Project name
Contact name
Phone number
Date
Drainage area number
For level Spreaders Receiving Fiow From a BMP
Type of BMP
Drawdovm flow from the BMP
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area Q.v~.at;. ~i~
Impervious surface area .
Percen! impervious
Rational C coefficient
Peak flow from the 1 inlhr storm
Time of concentration
Rainfall intensity,l0•yr storm
Peak flow from the 1U-yr storm
Where Ooes the Level Spreader t)Ischarge?
To a grassed bioretenlion cell?
To a muldied txoretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)
Fitter Strip or Rlpartan Buffer Gharaderization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Tote! width
Elevation at downslope base of level tip
Elevation at top of bank of the receiving water
Slope (ftom level lip to to top of bank)
Are any draws present?
cfs
~3~.~h ftZ COv~.~tMn.~ y-(ovJ~.
F4t.~'S~7 ~ ('~tudt.~s -}~~.1 av-e~c(r8+.~r4+~ Qv~G.(a.+d'i'fNl°C`~``•'~~c
zs
C~.SC? .
ds
IO min
~,5~r-' inlhr
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(Y or N)
tJ (Y or N)
1.) ~' a N)
Y (Y a N)
ft
~1~ ft
-- ft
~~
~~ ft
~~ ~' r! r4JD 88
~1 ~ra~o86
% C1i ~ to t
~~~ (Y or N)

Level Spreader Design
~-orebey~wtace~area 1~1p"~ sq ft
Feet of level lip needed per cfs I ~ fticfs
Answer'Y' to one of the following:
Length based on the 1 infix slam? (Y or N)
Length based on the 10-yr storm? ~~ (Y or N)
Length based on the SMP discharge rate? (Y a N)
Design flow ¢ cis
IS a bypass device provided? N (Y or N)
Form SW401-Level Spreader, Filler Strip, Restored Riparian Buller-Rev.5 Parts I. and ll. Design Summary, page 1 d 2

Length of the level lip 5 Z ft
Are level spreaders in series? ~~ (Y or N}
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland? (Y or N)
Does the channel enter the stream at an angle? (Y or N)
Dimensbns of the channel (see diagram below):
M tt
W ~ IQ ft
Y ft
Peak veloaty fn the channel during the 10-yr storm cis
Channel lining material
~• W :;
t3
Form SW401-Leval Spreader, FiNer Strip, Restored Riparian Burner-Rev.S Parts 1. and II. Design Summary, page 2012

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S70RMWATER MANAGEMENT PERMIT APPLICATION FORM
--x-401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILi'ER STRIP AND RES?ORED RIPARIAN BUFFER SUPPLEMENt
This ftnm must be completety filled out, printed and sutxrttned.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!
Project name ft. b
Contact name 3i,~t.(~ '-~t~rL
Phone number ~a ~.- f ~~ Z
Date f~'PtZ.I t.~ ~.~'70 ~ .
e
Drainage area number 18`_'_._f}D-'C q S'~a. il'1~0
For Levet Spreaders Receiving Flow From a BMP
Type of BMP ~' ) ok:.
Drawdown Oow from the BMP
q, ~ . :cis
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C rAefficient
Peak fbw from the i inlhr storm
Time of concentration
Rainfall intensity, l0-yr storm
Peak fbw from the 10•yr storm
Where Does the Level Spreader Aischarge?
To a grassed laorelention cell?
To a mulched troretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify}
Finer Strip or Riparian Buffer Characterization (if appflcable}
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downslope base of level fip
Elevation at lop of bank of the receiving water
Sbpe (from level lip to to top of bank}
Are any draws present?
Level Spreader Design
~ {Y or N)
1.7 {Y or N)
f.J, ~ {Y or N}
~( {Y a N}
Feet of level lip needed per cfs ) 3 fUcfs
Answer'Y" io one of the following:
Length based on the 1 inlhr storm? (Y or N)
~
Length based on the 10-yr storm? ~
(Y or N)
Length based on the BMP discharge rate? (Y or N)
^
Design flow cis
~; S
Is a bypass device provided? ~ (Y or N)
Form SW401-Level Spreader, Filter Stnp, Resrored Riparian Buller-Rev.S Parts 1. and It. Design Summary, page 1 d 2

Length of the level 6p ,g~ ft
Are level spreaders in series? ~~ or N)
Bypass Channel Design {if applicable)
Does the bypass discharge through a wetland? (Y or N}
Does the channel enter the stream at an argle? {Y tx N}
Dimensions of the channel {see diagram below):
~~~
W ft
Y ft
Peak veltxity in the channel during the 10•yr storm cfs
Channel lining material
• •

~
•-------------
y > ~ ...
,
-- -------••-i
M M
~ B ~
Form SW401-level Spreader, Filer Strip, Restored Riparian Buller-Rev.S Parts 1. and II. Design Summary, page 2012

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I~ICDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION fORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be compietety idled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CIiECKLIST AND ALt. REQUIRED REMS (NEXT WORKSHEET)!
Project name
Contact name
Phone number
Date
Drainage area number
~..
For Level Spreaders Receiving Flow From aBMP
Type of BMP ~~UaUQ:-.
Drawdown flow from the BMP `7: _ • 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 inlhr storm
lime of concentration
Rainfall intensity, l0-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Olscharge 7
To a grassed biorelentan cell?
To a mulched bioretenlion veil?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)
ftRer Strip or Riparian Buffer Characterization (li applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downslope base of level lip
Elevation at top of bank of the receiving wafer
Slope (from level lip to to top of bank)
Are any draws present?
fiZ
~- f1z
~.....~ ~
cfs
min
inrhr
cis
N (Y a N)
~) (Y or N)
tJ (Y ar N)
Y (Y or N)
ft
~~~ fi
ft
ft
kii~. . 1~ t~vO 8 t3
~~
t.~ _ (Y or N)
Levet Spreader Design
f
-r
b
k
~I ~ s
eee~rea
a~lr
ore
Feei of level lip needed per cis q
(3 fUcis
Answer `Y' to one d the following:
Length based on the 1 inlhr storm? (Y or N}
Length based on the 10-yr storm? ~ CY or N)
Length based on the BMP discharge rate? (Y a N}
Desgntbw "7 ds
Is a bypass device provided? ~ (Y a N)
Form SW401-level Spreader, Finer Sirip, Resiared Riparian Buller-Rev.S Parts I. and II. Design Summary, page 1 of 2

Length of the level lip c'1 ~ ft
Are level spreaders in series? ~_L____._ (Y or N)
Bypass Channel Design (if applicable)
Does the bypass discharge through a weiiand? (Y or N)
Does the channel enter ftte stream at an angle? (Y a N)
Dimensions of the channel (see diagram babw):
M ft
e ft
W ft
y ft
teak velodty in the channel during the 1Q-yr storm cfs
Channel lining material
•
;. `"~ .~

-------•-----
Y ,
--------------+
M M
i ~ i
Fam SW401-Level Spreader, Filler Strip, Restored Riparian Buller-Rev.S Parts I. and II.Oeaign Summary, page 2 of 2

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NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This fomt must be completely 8ged out, printed and submitted,
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS {NEXT WORKSHEET)!
Project name
Contact name
Phone number
Dale
Drainage area number
For Level Spreaders Receiving Flow From a BMP
Type of BMP ~til7ls.~
Drawdown flow from the BMP to ._ ~ , cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percentimpervious
Rational C coefficient
Peak slow from the 1 infir storm
Time of concentration
Rainfall intensity, l0-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge?
To a grassed biorelention ce11?
To a mulched bitxetention cell?
To a wetland?
To a filter strip or riparian butfer7
Other (specify)
Filter Strip or Riparian Buffer Characterization (Ef applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downsiope base of level lip
Fevation at top of bank of the receiving water
Slope (from lerel lip to Io top of bank)
Are any draws present?
n2
~~ ftz
°~
cfs
min
inlhr
cfs
~(Y or N)
N (Y or N)
N {Y or N}
ft
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~. ft
.. f<
boo ~'NAva~B
~~~~
S
(Y or N)
Level Spreader Design
h
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'
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Feet of level lip needed per cfs ~
4'1 fUcis
Answer'Y' io one of the following:
Length based on the 1 inlhr storm? {Y or N)
Length based on the 10-yr storm? y (Y or N)
Length based on the BMP discharge rate? (Y or N)
Design flow ____~cts
Is a bypass device provided? ~ (Y or N)
Form SW107-level Spreader, Filter Strip, Restored Riparian BuNer-Rev.S Parts 1. and II. Design Summary, page 1 or 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
8
W
Y
Peak vebaty in the channel during the 10-yr storm
Channel fining material
H
~g ~
N (Y or N}
(Y or N)
(Y or Nj
fl
if
R
ft
cis
w
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Forth 5W401-Level Spreader, Finer Slrip. Restored Riparian Buller-Rev.S Parls I. and II.Oeslgn Summary, page 2 or 2

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STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION fORM
LEVEL SPREADER, FILTER STRIP AND RE5T4RED RIPARIAN BUFFER SUPPLEMENT
this fam must be completely filled out, printed and submfitsd.
DO NOT FORGET TO ATTACH THE REQUIRED REMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET}I
~~ name - - a , .
Phone number `'
~. 5 A G~.
Date , ~~
Drainage area number r' - _ ~' 1
For Level Spreaders Receiving Flow From a BMP
Tl
Type of BMP ~~(~
Drawdown flow from the BMP , _ , ~~ ~ cis
For Level Spreaders Receiving Fiow from the Drainage Area
Drainage area
Impervious surface area
Peroent trripeNI0U5
Rational C coeffiaent
Peak flow from the 1 inmr storm
Time of concentration
Rainfall intensity, l0-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Dlscharge ?
To a grassed bioretention cell?
To a mulched bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (spedfy)
filter Strip or Riparian Buffer Characterization {ff applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation al downslope base of level lip `
Elevation at top of bank of the receiving water
Sk>pe (from level lip to to top of bank)
Are any draws present?
Level Spreader Design

-~-
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~
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~.•.- ,-
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.
..
r
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-
cis
,r
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cfs
{Y or N)
~' {Y or N)
~~F (Y or N)
(Y or N)
~: is .~.st ; fl
ft
{;- _ fast'' Novo 8 8
96
_ (Y or N) ~jN i rw r>
_~
fUc#s
Feat of level lip deeded per cis
Answer'Y' io one of the following:
Length based on the 1 inlhr storm?
Length based on tha 10-yr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
{Y or N)
(Y or N)
~~ (Y or N)
. F . 1,.~ . cis
lJ (Y or N)
Form SW401•Levei Spreader, FNter Strip, Restored Riparian BuHer•Rev.5 Parts I. and II. l7esign Summary, page 1 a 2

Length of the level Gp
Are level spreaders in series?
iBypass Channel Design (it applicable)
Goes the bypass d~charge through a wetland?
Does the channel enter the stream at an angle?
lJimens'arls of the channel (see diagram below):
M
8
W
Y
Peak valodty in the channel during the 10-yr storm
Channel lining material
1 ~o ~ C+~x, allot~lc~~
(Y or N)
(Y or N)
-~-(Y or N)
tl
fl
K
~~h
ds
13
Form SVV401•l.evel Spreader, Filler Strip, Restored R~arian Bufler•Rev.S Parts !. and n. Design Summary, pays 2 d 2
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STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPL1CATlON FORM
LEVEL SPREADER. FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely liked oaf, primed and sutxridted.
DO NOT FORGET TO ATTACH THE REQUIRED REMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)f
Project name
CoMad name
Phone number ~ ,, , . ~ ~ : ~. .
.. _
Date
.,
Drainage area number . - ~ .. .:
For Level Spreaders Receiving Flow From a
Type of BMP
Orawdown flow from the BMP
For Level Spreaders Receiving Flow from the Dralnage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak Bow from the 1 inlhr storm
Time of concentration
Rainfall intensity, l0-yr storm
peak flow from the 10-yr slam
Where Does the Level Spreader Discharge?
To a grassed bioretention cdl?
To a muk~hed bioretenflon cell?
To a wetland?
To a filter sUip or riparian buffeR
Other (specify)
fitter Strip or Riparian Buffer Gharacterization (if appUcabie)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
tJevation a1 dawnstope base of level lip
t?Jevatan at top of bank of the receiving water
Slope (from level Gp to to top of bank)
Are any draws present?
level Spreader Design
~...~~.. a..,~e.,s ~e,
(Y or N}
(Y or N)
,N
~~~/~~- (Y or N}
'~i (Y or N) ,
~, ft
ft

r 'i ,-'; •' ft
~:.. •:

,, . 6psf

` %
y~
_ ~ or N)
fflcis
Feet of level lip needed per cis
Answer'Y' to one of the foNowing:
Length based on the 1 infir storm?
Length based on the 10-yr storm?
Length based on the BMP discharge rate?
Oes+gn flow
is a bypass device provided?
~~(Y ~ N}
(Y or N}
~_ (Y or N)
~.,~ ors
~ . (Y or N}
Forth SW401-Level Spreader, Filer Strip, Restored Riparian Rafter-Rev.S
Parts I. and a. Oeaign Summary, page 1 of 2

tergth of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge Uxtwgh a wetland?
Does the channel enter the stream at an angle?
Dimeltsions d the channel (see diagram below):
M
B
W
Y
Peals velocity in the channel during the 10-yr storm
Channel lining material
5~i K
~1 (Y or N)
_ (Y a N)
(Y or N)
fl
....
ft
~,~..~.
ft
fl
---w~~ ~
. ~.. ~.,,..... ~,...:: w. Y
s
Form SW401-Leval Spreader, Filer Strip, Reatored Riparian Buffar-Rev.S Para I, and It. Design Summary, page 2 or2
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Please indicate the page or plan sheet numbers where the supporting documeniaiion 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 justificat(on.
Page) Plan
Initials Sheet/No.
~w~F
1. Plans (1" - 50' or larger) of the entire site showing:
-Design at ultimate build-out, ~ S
IJ/f1
-Off-site drainage {if applicable
,
R
l C
ff
basin)
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e
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neate
nage
as
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e
-Forebay {if applicable), ~ G
-High flow bypass system, N f~
-Maintenance access, ~1~~
-Proposed drainage easement and public right of way (ROVIr), and y-~
- Boundaries of drainage easement, ~/~~
~~ F~~B 2. Plan details (1" = 30' or larger} for the level spreader showing:
' - Forebay (if applicable), 'a^~ ~' ~~
- High flow bypass system, /Y~.¢
- One foot topo lines between the level lip and top of stream bank, ~/-~
- Proposed drainage easement, and ~/-~
-Design at ultimate build-out. ~,,~
J, /
t~ ~ 3. Section view of the level spreader (1" = 20' or larger} showing: .
~/~ - Underdrain syystem (if applicable), r/q
- level lip, !8
- Upslope channel, and /~
- Downslope filter fabric. 1 t~
_~ z~ ~ .A 4. Adate-stamped photograph of the filter strip tha# clearly shows the type of vegetation that is present. ~"~/~x ~T
~5,(~ 5. A construction sequence that shows how he level spreader II bg prot led rom edimen u II he entire
v ~ drainage area i5 stabilized. ~~/~ % ~ ~rf ~ s ~,.1 /fir ~r.,~.~ + ~~.r ~+~
~ 6. The supporting calculations. ff~.~,~; ~ ~
~~~_ 7. A copy of the signed and notarize Aeration an,~ m intenance (0&M) agreement. /~~ ~ ~ ~ i jS,,/ ~/
Vii' G~J f'P,w,.,~~y ~j~/'~ ~'•~ ~"~ O •~'1 .aJr Ps.a..w •,,,,~ Y~.~}f'~ 1 ~ha.- ~`'•~/
8. A copy of the deed restrictions (if requ qd). ff / / r
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Pari III, page 1 of 1