20051764 Ver 1_Information Letter_20051110

„~ STn7F a
w.ao„
~ -
~,@~~,
STATE OF NORTH CAROLINA
DEPARTMENTT OF TRANSPORTATION
MICHAEL F. EASLEY
GOVERNOR
LYNDO TIPPETT
SECRETARY
November 9, 2005
MEMORANDUM TO
FROM:
SUBJECT:
Christina Breen
Transportation Permitting Unit, NCDWQ
Michael Turchy, Natural System Specialist
Natural Environment Unit, NCDOT
Request for clarification for U-3823 (the widening of Airport
Blvd in Wilson, Wilson County, NC)
Per our phone conversation on November 1, 2005, below and attached is the additional
information you requested to process the individua1401 certification for this project.
Request: Please enable layers for all pre-formed scour holes and level spreaders on the
hydraulic drawings.
NCDOT (Hydraulics) Response: This information was left mistakenly left off of the
drawings. NCDOT Hydraulics unit has included this information beside each structure
in the drawings attached to this letter.
2. Request: Verify the hazardous spill basins are designed so that the first inch of rain drains
to the level spreader first, and all additional rain then proceeds to the bypass ditch.
NCDOT (Hydraulics) response: The level spreaders on U-3823 were design according to
the October 2, 2001 letter from DWQ. We could not design the spreaders for the entire
Q 10 because of excessive flow and terrain constraints, therefore we designed them for
the 1 inch per hour storm with bypass of the Q10. Sputter boxes in the Hazardous Spill
Basins were used to divert the 1 inch per hour storm to the level spreader. A weir was
placed inside the sputter box and set at the water surface elevation of the 1 inch per hour
storm to direct the flow to the spreader. Bypass was directed to the stream with base
ditches.
3. Wetland sheet 5 of 15 shows 4:1 slopes, however, as discussed in the 4 C meeting, this is
to be a 3:1 slope.
NCDOT (Division 4) Response: Correct. These should be 3:1 slopes. The cross sections
have been changed to reflect this. This change has also reduced the amount of wetland
impacts to wetlands associated with this slope. A revised impact summary table and
Site 1 drawing is attached to this letter.
MAILING ADDRESS: TELEPHONE: [phone] LOCATION:
NC DEPARTMENT OF TRANSPORTATION FAX: [phone] TRANSPORTATION BUILDING
PROJECT DEVELOPMENT AND ENVIRONMENTAL ANALYSIS 1 SOUTH WILMINGTON STREET
1548 MAIL SERVICE CENTER WEBSITE: WWW.DOH.DOT.STATE.NC.US RALEIGH NC
RALEIGH NC 27699-1548
o~
~~
N0~ ~~
cy~. o f , 10 ~ ,~
~'~os~R•w ~~p-
gNOS °RMw~q<<,y 3
Re~'Ch

4. Verify wetlands impacted in the buffer zones have not been "double calculated" for
mitigation.
NCDOT Response: The wetlands have been calculated properly for buffer and wetland
mitigation.

i ~
s
i 1
r a
n o 0
rp ~m m
mrn rZ z
D Z r o .-..~ O
~°o _m Zrn
cZi N Z ~' m ~
_ f -v ---I m
Z 3 -TI m r x
m .~~ Dn
~rn r3 ZD
--~ D Z Z D D
z o m -+
D N ~ Z O
zm ~ z
O p
x.
~,r;;, a::~ ~:y s~
~.-~, r..
a.+
~ •i~{ 6.._~ ~ ~
~; ~ 4L~ ~,~ t',r,
G:a;, p ..
~O
O
1"t
rO
rm
Z
z°
~m
c~
~ -D
mm
D~
n3
mD
~Z
Dm
„~ Z
m -'
0
m
Z
0
-I
3 cmn
'D
D --I
nm
-+ 3
cn -~
O
~~
D
~ o
~N~ s
~~ -
~~
X
~
v
0 m/
N

~ k ~-' m
o / m
2
X
i /
~ d ``
\\\ x. ~~d
I
F ~' ~q
~[
I
m i ~~, ~
~ ~ m
~ ,~_~
i 4 f~ ~ ~
m ~
n
a
~~
~~
m
n

~ `_ ~ ?e ~
.k ~ ~ ~ ~_
`X
k~~w
k
O j'~, `~... ~
T ~ ~. ~.
rn ~~
'- ~ B
~^ ? r~i O
'~
70
F
D
O ~
A /,12.e
~~ w
Z ~'
< ~' ~ A
-~-,~1',
j R't -'~ ~ ~ 30d --~ _
N
N ~ v
= m
z~ t W I
..<~ ~- 'v
z~>. ~ ~ m
... m
~1~ 4.,,,, I~
J ~.<,; M~ ~ i~ ao
J t`= ,~~ c
~:~ ,~ ,
~~ ~ G • D O u
~~~ o .
~ n ~ '~ ~
~s ~l~
y ~ ~ ~ y ~ O_~~i
rmn rn ~„~ y 0 H ~' m
~` Z~cOZp ~ ~~
ccCnnQwZp~ ~
~N~ Q7 WO=Z ~ ~~ m I
-nO I ..~~" C~N I
~~D~o Z=~ ~~. ~~
rn ~-- ~ ` ~ '<< I
D~ DD
~ Q
Z __~ ~, s4
I'~
<0
f11 '.
~'
III
v
m
L ~
~ ~
~ O
.T ~~ ~ ~ ~ ~
k-~ u-1 ~ ~8 ~S ~ y
~`~ k---~
'~--~
~m'
~~
~~
rn
o~ o
rn
n ~
rn W

t ~ ~10~ -
;I ~
O I
I(l i
I~I I ~
s
~ III I dr ti~
~ II ~ m
~ ,~ I /
III .Bl ' IT1
-~-
I
I
I
I
I
I
I
~~

~1
I
ih
1 ~l , .
~'
,I m
~+ 'G
Ir r
°~- ~
L N
m ~
I Z a
-~ O
-~
m
I
i ~ ~
l
~i ~
I' 1
i
-`_____
~.!
o <<ao 0
ii ON 0- ro ~
u ~~ u ~ u
ONNOw - •~
w~oaoo 1O -
c~ O
-~11 N y -1 ~ (~/1 D
~ N A

/~e/
~x
e~~`~
F
_--~ ~ o
~'
I / i
°1~ ~ ,
~~ _- ~~
~ o~ i i i
~, ,
,~
~,
~ `
~, .
.,
,°
~~
'tee
O ~
Q~
m ~
L N
Z
0 50°
a
_...~

~b
0
T O m
~z z ~
0 0
r~ z„a
`m m
Z~ mU'
~~ ~m
mm rX
~~ Dn
rDD p4
z Z In D -~
am
cn Z O
-~ z
zrr
0
a a ~
~ o
o a ~
J w
Y
N ~n
Z'T' ~ o
o d
N
4 ~ ~, --~ d
~ N ~ _ N ~
0 0 ~
rz Te
0 0 ~
ri, Z °
~~ v~
~n ~ -~ cn ~ R, ~ f
~ ~-
rn _
`*~Z~~~ ~'ZO a
"~~ Z~cd „
NrncCnnO~ZO-~
~N~~ n ~
Orn~Nao~'O?Z ~
~ ~ ~ ~ ~ ~ O ~
~ Q O
~ ~ ~ ~ ~_
~~ NO
~ Z

~,
-~'
~'
n
ro
mm
D z
~o
~~
z r,-i
~~
Z ~
rn
~~
m=
~ D
r~
D N
z rn
00
O
V ^
~ O
,.._, m
rz
ro
~~
0
~~
cm
~~
~3
r D
~ Z
mm
~z
---I
O
Z
n
.. _
O _y
N
n
O
r
O ~
t/~
Z ~ o
N
rn ~ s
O F
~ ~ ~
o rnN ~
Q ~~ z
O N
Z
_ z
Z m
5 ~'~
z
0
N
O
O
~\
• ~ ~\ --z ~----
('~ ~ .
~ -~ o • -_.
~ stn <rn ~~....
to -D-I ~ ~ ~
rn Q ~ - -I
r.rn~ 7vC~Z0 ~
C Z "o I ~ ~~ ~:. ;
~cnnOwZO~ ~.~ _~°fi
N ~ O ~1 Z * k ., fF ~ ~
0 rT1 ~ - y ~, ~ ~
~N~oo z=o ti-r,
to p :., ~ ~ 70 ~*
o ~ ~,
~ ~~ N~ ~.
-~ o .~.
o
3 z
1 1 '+ Q
'1 1

fi
11 1
1
~i
' 1 ~0
~

1
1 1
„+ 1

1 g

1
II
II
II
11 ' 1
1
1
'

~ 1

1

11 1
~ 1 1 n
1
II
I

I 1
'
1
1 ~ ~
1

I
II I
~ 1
1

I il~
II~°
111 ~!
' 1 0~
~ 1 rt
~'
I
II
III 1
I 1
~ 1

II
II 1 ~+

~)
I~
111
II I 1
I11
I
'
op 1
~1
n
I'
~11 r
II
1
I
I I
ln
11
I
'>S ~ - -
.~
~o
~o
~ ,~ ~ ~ m
!, ~
If '~ ~ ~
s

0
0
0
v
n
0
n
t~
,~ ~"
a

O
~ D

z
0
z
~
° m
o
° Z
_ m
z~ rn
rn~ _ -~
3~
~~
mm ~X
r D-I

r~ m
ZD cam
~3
DD ~<
~ D ~
O
Z Z
Om ~

cnz
o D
~
~ Z ~
Afl
I
1
I
1~
1'
1~
iw
~~
-1
1
-~
1 m
1
I
v
1 m
I ~~
~s
-o ~~
0
1 m
1
I
m
I ~
~ I
I
I .~
~ v
I ro
~ v
i I '"
0
Q
-~C
O
0
n
«a o
p N ~~ ~~ ~
o ~", .~ ~ ~, ~, n
rV V ~ ~ y ~r
~ V
y 'D ~ -~i c~i '~1 N
T1 N N N D
~1 n
~1 ~
1' I
1
'1
I I
VIII
~'1 I
II ~ ~
1 ~
A '~ m
~ , ~'
~ ~
o `- T
~ 1 ~
~ ~^
g
~ ~
n I
dti ~
.o
.T
/ ~~
/ 5S
i
.~ ~ ~~
4''~/ i~
~~~~' '
4r ~'~ . /
I ~,'~~''
~Sa
~°= ~
ti ~
~ ~h
i i
~p5 ~
1 i
~ `)o. ~.
~// ~ ~
'a
a ~ I
. ~ m I
o ~
- ~' o
-y z
soft ~.,~~ ~

~ ;iE .,.:,_..
'~.F.~. obi
i
*: .,.: ~

~;
.. ... ,.
~'::. ..:
n
r°
mm .gym
~
z o
m o
m m°
~m
z
~o r
r° z
o z
o r
r

zm
zcmn
'-'m z
m o
-,-,m
c~ U, ~ ~ C cn o cn
~
z3 ~
mm ~m mm cm
~~' r~ ~~ ~'~ ~3
m= DD o mo rD
-I D
r~ Z z
om
z ~
D ~
~D ~--~
-'m
m
Dom,
zm
~--~ ~
~ D~
m~ z
~-i
00
~~

r
0
o :~ ..
00' 00 + 6L -l : 3NIlH~l`~1N
n

.-,
I
I
.~
. I
1
;I
~t
~~

`]

rn ~ --
..
O
N .. ,1,

~~ ~ ~
,~
z~
m
a

J
Z m
S .~ ~ ,~

o F
A ~ `~
~ ~ rn ~ ~ n
~ ~ ~ Z
~
I
rn ~ ~~
I
O
? ,~ .~ ~
-a' ~ ~ -
N
/'1 ~
n -~
~ ~ a
0 ~`
~~ o'
y -Nib <rn
tern ~ ~~~
rn„ SOD y~.
-~ryi~~Z7oCOZ-n
~-tcAnUwZO--~
O rn 0` N~ ~" ~ O ~
'~7~~'"~r C~~
~N~Oo Z=C~
O ~
v
~ ~~ ~D
~ O v'
~ O
Z
z
W S
O ~
z
N
O
r
\ s
~I I
II
li
~I
I
A I
I ~ ~`
I r~
I ~,i
I I i'
I I I~
I I~
~ i'
i_II~

.~ •__v \_
~:
~ _~

-~.
80 J
O
~ n
\t ~--- p
~~~ n

.~
sz ~
..~
~~..~~
I I ; `~ ~V'
~~
I 3
I ~
I .. ~ ~
r. ~
t ~ "<
~ ~ ~
'~ ~~ 3
-~
,~ :~ ... -
~ N .. .. .. .. .. .. ..
o ~
~ I - ZS
~I ~ ~ z ze-
II H
I m x m ~~ ~~
Z° m m
I ~'' D 3 3
III ~ O ~ v -v
O~ m -~ ~
II , -~ ~ c
S ~~
~ ~ ~a ~ ~I ~ m `-' ~
I z
_ I
52 F-F ~ ~
O ~
C D
J `~ /~
~ I ~ I ~ C7
a-- -~..- - I ~I p m
,I ?
P
I;I ~~ ~ ~ °

..~ ~_
i a
I .

~ y
~. ~
~`~ .~ T II z
I
`''
I i1'

~ / ~
~;~ -
~u#; I '
iI ~
I ~
~F I
~ ,
,oo o~ I i I ~.~~
v ,~~
~
~
d
~ ~,
T=~,~ ~.>~ m ~ I ~~ ~1~ ,, , /
~ ~
~
_~ ~ ;I ,~
/
. ~..
~ ~",~ Ir I I / /
/
~ ,~~~~~
"p' i^ /
I ~ I /~' L
/
~`~` MATCHLINE -L- SS+00.00

.:~;'.~:~'';':j:.;
~ i~.. ~
F rr'.;.
,i ::~ .
F r: I'i;:
ty,:,a ,
,.:.
t" '` `'

~
D rn
~ ~ ~
mm ~z z / D
~z ~° o
~ o -~
zm
~~
z~
~m
3cn
~m ~
~
O

z~ ~~
mm D~
cam rn

D
I-'z ~m D
D N ~ ~ ~ Z
zm
~~

~I
O
O
~ ~
o-
+~ ~ t~
/ /
/~~D / / ~, s `"
~k X ,• ~/ // ~~ ~
O
N ~
s
n

~, ~ A
0
0

rn

N
m ~° C1
~ •
~-~ -v
~~ ~rn
= p 0 ~ y ~
^ r •
rn -~ ~ ~ D cn ~
.-~^.' Z~vCOZ~
C~C~pc'aZO--~
rnp~N WO=Z
W
-n t`~ I~ --~ r- C ~yv
°oDOo Z=O
•..~
~~ ~n
~~ N~
~ O
z
~ ~
`~ ~
/, / D ,
,a
~ ~
/~~ / ~,D~a _'_
i~ i~ ~'~~
~„ ~:
k:,~ ~~ tt
~~
a~~
4 ~,
.,~~
:~.
~`'~..
0
N
s
F
0
Z
-~
v
m

D
_ rn
O ~
V O
N
y
n
Sad

~ ~~ ~ ~ .~
-I a
.~ ,
~ n
~ I ~ ~ .~
'.a
00 ~ li ~) II a D
~ ;~ '~ ~'
s ~I
~~ ~~ II
~ ~ ooi
_ ~~ ~,~
P ;~ ~;~
~~ ~ _
~: ; I I ,~~
•I ~
r
'~ '° ~ I w I ~ '~
I~ ~ i~ ~I~
'~ i~ ~ i~
~; ~ ~~
r: .~.
~~ ~~~ III
-~ ~ ~I,
fi I wl~~
a
~ II I i~~
I Ad .Z I} I ~
`~ ~ I~ ~
I II
I' ~
fi ~!
I
I R ~~ ~I
~

~A,y ~

I
I
o I
I \ -O
I ~ ~ ~
I
I ~ I
j
I
=1 I ~
m
l I
s

°
~ , ~
I
; ~
I,
I I
1 ~
~~ fi

~ ~
m A

~ ~ ~~ I m

I I

~ , ~ `1',
I I I
i ii
I
I I I ~
~
rn
~ ~ f
~
'
' ~ rn
I
'
~ ~ ~i ~ fi
~
N
-~
~ I ;- ; ~
~ ~ ~ ~ H' I
~~
m I~ ~`
' ~ ~~
'
~
~ i
m
~
I

~ .
'
, ;
I
~ ,, ,

3
~~
-a
N~
m
v
Z
O ~ ~`
z~
m~
~_
~~

o <ao ~
a
0000
N cD ~ W
~,T~~
n
-~f N N n
-~
~~
8~,
90
m
70
m
O m
0
~_
r
r
('~
95