20020831 Ver 1_More Info Received_20020626

f II E CAP'
Environmental Consultants, FA
Road Raleigh, North Carolina 27614 Phone: [phone] Fax: [phone]
NCDENR-DWQ
Attn: Mr. John Dorney
2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27699-1621
June 26th, 2002
r ~", ~'
a ~.~ '' .
~~ '
,~
~~ JUN 2 g ~
~~,a, f~ ni~~ - -
RE: Request for Additional Information-401-Water Quality Certification and
Neuse River Buffer Rules Compliance Request
Park at Langston
Cary, Wake County, North Carolina
UTM coordinates: ~03soo~„E 39' 3~~son,N
S&EC Project #: 5968
DWQ Project #: 02-0831
Dear Mr. Dorney,
In response to your letter dated June 4`h, 2002 (see attached), enclosed is the approved
wetland delineation for the Park at Langston as well as calculations provided by the
project engineer regarding diffuse flow through the Neuse River Riparian Buffers.
It should be noted that in the preconstruction notification form (PCN) originally
submitted, under Item XI (which discusses stormwater), it was erroneously mentioned
that calculation tables provided by the project engineer were included in the application.
These tables were not included in the application submitted to NC-DWQ. However, as
indicated in the attached calculation tables provided here by the project engineer
addressing stormwater issues, impervious surface acreage is estimated at 15 %, well
below the established 30 % threshold requiring stormwater management plans.
Therefore, we do not believe that a stormwater management plan should be required by
NC-DWQ.
Please call me if you require any additional information, or email lne at
j cooper(n,s and ec. com.
Charlotte Office:
236 LePhillip Court, Suite C
Concord, NC 28025
Phone: [phone]
Fax: [phone]
Greensboro Office:
3817-E Lawndale Drive
Greensboro, NC 27455
Phone: [phone]
Fax: [phone]
I-iickory Office:
710 Boston Road
Taylorsville, NC' 28681
Phone [phone]
Fax: [phone]

OF W ATFR _ __ _ Michael F. Easley, Governor
~ 0 ~ ~ , ~ William G. Ross Jr., Secretary
~O G ~ ~ ~! :~; (~ 1N rth Carolina Department of Environment and Natural Resources
j ~ D - - ~ ~ Gregory J. Thorpe, Ph.D.
~ I ~ Acting Director
O ~ ~~.~''' ~ Division of Water Quality
~~, -
~',
------.• June 4, 2002
DWQ # 02-0831
Wake County
CERTIFIED MAIL -RETURN RECEIPT REQUESTED
Jim Cooper
Soil and Environmental Consultants
11010 Raven Ridge Road
Raleigh, NC 27614
Dear Mr. Cooper:
On May 24, 2002 the Division of Water Quality (DWQ) was notified by receipt of your
application regarding your plan to fill wetlands for the purpose of providing roadway and sewer access
for the residential subdivision in Wake County. Approval from DWQ is required to disturb these areas.
Please provide 7 copies of the following information and refer to the DWQ # listed above in your reply.
In particular as described in 15A NCAC 2B .0502, we will require you to locate all streams and ponds
on the property. Please show these on maps of suitable scale (for instance 1" = 100 feet) so we can
begin to determine your projects' compliance with 15A NCAC 2H .0500.
Your plans indicate stormwater discharge that will not flow in a diffuse manner through
buffers. Please provide plans and calculations to show that diffuse flow shall be achieved.
Please provide table referenced in item # XI.
Please telephone me at 919-733-1786 if you have any questions or would require copies of our
rules or procedural materials. This project will remain on hold as incomplete in accordance with 15A
NCAC 2I-I .0505(c). 1'he processing time for this application will begin when this information is
received. If we do not hear from you by writing within three (3) weeks we will assume you no longer
want to pursue the project and will consider it withdrawn.
Joh Dorney
Wa r Quality Certific tion Program
cc: Raleigh DWQ Regional Office
Raleigh Corps of Engineers
Central Files
File Copy
William Baker

North Carolina Division of Water Quality, Wetlands/401 Certification Unit
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
Ph: [phone], Fax: [phone], http://h2o.enr.state.nc.us/ncwetlands/

C ENGINEERING
TRANSMITTAL LETTER
TO:
~: w. ,r.e p fem.
s~ E ~
CH Engineering, PLLC
4601 Lake Boone Trail
Raleigh, NC 27607
919.788.0224
919.788.0232 (fax)
DATE: f;/ ~.~~ 2JOB NO:
~~ ~ ~
We are transmitting: Delivered via:
p~ Attached ^ Courier
^ Under Separate Cover o Overnight Delivery
o Via email / ftp ^ Mail
The following items: ^ Plats ^ Digital Files
^ Plans ^ Specifications ^ Change Orders
^ Drawings ^ Shop Drawings ^ Documents
o Application/Fee ^ Other
COPIES DESCRIPTION

~~OC 310. O 'F E: ~ a ~CJc
II
L/ aL f0• p~~~.~ 1`
LL
r L-

o For Approval ^ Approved as Submitted
GY"For Your Use ^ Approved As Noted
a~As Requested ^ Returned for Revisions
^ For Distribution ^ For Review and Comment
Signed ~h'l ~~ C~, ~.+Gr~ /' C _

r~ax~y r'Ax svr J='agt3: oo~- ~ ti ~ Pa,k fit- ~4~s+~~`
/~ Part 1, ttJparlan Buffers
~ Area includes. riparian b,,ricers"~ () hJc ~QYes f ]F.xem~p:
if yes, ~5U foot pQ 100 toot
River Basin'? Neese (I Cepe Fear
Basis for exernpt~or..-_u,________.__...------____-- .------
show buffers on site plan.
`~~ part It. Nltroyan CaiCUlatlo
~,,~ ubdi~7slon ir~tortnaton;
Number of lots
~Jumber cf lots ; acre
Total area of lots (excluding
RNV and open space)
Average lot size
t~, Fora-development loadino:
Type ~` Land Cover
ns (Method 1, Appsncltx C):
3L•4Zp`
18• Szp~
----~-'1~_ ~ i~~s ~'
Permanently protected undisturbed open space
(forest, unmown meadow}
Permanently protected managed open spare
(grass, landscaping etc. )
lmpervious Area
TUTA~
PJitrogen t.oading Rate (Ibs/acJyr) = i o • 6
c. Post-development lozding:
Tyos of Land Doves
Permanently protected :~ndis`urbed open s~~:e
(`orest, unmown meadow)
Permanently protected managed oiler, spare
(grads, landscap•tlp etc.)
F?ighf•4f-V'Jay (read 7N ex;~rt from Grcphl)
Lots (read TN exr~ort firm Graph :~;
ae•eraga house size
Arr~ou~t of Right-of-Vl~ay
Percent of Right-cf-Vl~z~y
that is Impervious Brea
Iota( ~timaiecJ impervio;~s .arzz
~z7s sF
3 • '~ A c
S ~_
TN export
Area TN export coatY. from use
(acres) (lbs/ac/yr) (Ibslyr)

--32• X12 -~
0.so~~ ~ g • y s

_ _
r I
1.20
21
20
p .
__
t q y ~
TN export
Area TN export coeff, from use
(acres) (lbs/ac/yr) ilbslyr)
0.64 ~
_ /o •2d _ (D• J Z~I
1.2A 1
! 3 `~ ~«~~:` z 7 2
70TA1.
Nit'agen t.aading Rate (Ibs/ac/yr) = .__2 - ~l
Nitrogen Load after BMPs = ~ N r ~}-
Nit~•ogen toad Offset by Fyaymenis =
Net ch2nye In on-site N t.aad ~ __._ -
Parr NJ. Co~irut of Peak Storrnwator Flow
Calculated Pre-development Peak ria.~ _ 0_'l8- cis
~~ Calcu~ated Post•d8velraprnent F'eak r=1ow~_b~7o
I, the undersigned, certify tc the best or my kno~~,igdpe that tl~ce above informa`io:~ is correct (affix seal).
``~at4~u~ae~~~~~o
.~`' 1~ OAR '~~.
o Q a -~
°.
O O
S EA~ °~' ~
° 10 °
°
° 40
~ e ° w
° , t
~~y,~~°°~'~'GI WE~`~°° 5,~
~ooea~ ~~ CHA~~~'\yo°°v
B~a~0E46Apd8`b~e / (/ p l
7 v

Graphs for use with Method 9: Residential Sites with no known building footprints.
-____---- Cir~~t ~I . ~~t~ ~~trr~g~n ~xpark #rQrn ~i~hr~-t~f- - --v--?
~~.~
~~.~
~ ~~.~
~~ ~~
a,Q
Parcen:tags ~~ ~"ig~#~-of-1~ay that is 6'avarnent
~~,'
-;

- 1

C3~apl~ 2: Tot~4 C~itt't~t~- ~xptxt't fr~rtt Lpt~
'F'a~t~l t~itrt,~e~-~ Expart frt-rr- ~.ats
i2.~.~
~ac~
,, E.~t'i
~_ 6_~
w
~ ~'i
2C).n
0.~
.~
r
1
2 d 6 fi ~0 ?7 ^:4 -i~ 13 30 22 ~4 24?. 2z~:f.~ ;'
f~unb4a' ~ Uwc~41lru~ Units per Acrh

o ~\
o
0
~ Y~''o diatldia I
s
o i
~ may ~ '~
-~-_~-
_',\ ~ ~ I,
~ ~~
I
~~ \ '~
' I I / O~GE, 361 A6 ~~~'
~ ~ ~ ~ N~~b°'j~ i
\ dJ '
~ ~~ ~
S OS
'~~ \ ~ ~ ~ )1 °a~'N Nf/Rit/dRl I
FT ~~~ ~ °pOj~~b
j \ \
tib \ ~ ~ / l ~
it bCj \ J\ ~ ~ \ J~/~~ i
it I I \ ~ \C1 ~ ~ - - ~ yjb,
i ET L ~-----
~----~
~ _ ~ ~ --.
~ - ~-- ~~
- -- I --~
\ ~ ~. ~~
I ~~°o,~~'• ~~
N~~ ~ ~NgcF~ I
~ 85 ~ - 18' CP bd/Z/ ~SF.y~F ~
I ¢q \ \ ~ ~~
~ o ~ o \ ~ ~~
N
m ~ > w zj ~~~ d~~
w z ~ w ~~
~ ~
I \ woo.
> a n O I
_ _ SIIOS OWL'dH OOOId J_=
+ I \ \ 'I
I~ ~ ~~
J
...\Barker\Langston\aj002site.dgn 06/25/2002 02:10:55 PM

ENERGY DISS/PATORS
ED 1
L = 18'
W = 21'
22" CLASS B RIP RAP
D(50) = 6"
ED 3
L = 12'
W = 14'
22" CLASS B RIP RAP
D(50) = 6"
ED 2
L=9'
W = 10.5'
22"CLASS 8 RIP RAP
D(50) = 6"
ED 5
L = 12'
W = 14'
22" CLASS 8 R!P RAP
D(50) = 6"
ED 4
L = 24' MIN
W = 33'
22" CLASS "B" RIP RAP
D(50) = 13"
PIPE FRO TOP /NV LENGTH SLOPE TO TOP /NV
1 36"RCP G/ 2 356.59 352.20 45.0 0.0 MH 4 357.11 352.20
2 18"RCP 374.20 85.0 0.5 370.00
3 2- 36"RCP 367.48 80.0 1.3 366.43
4 24"RCP G/ 5 373.00 370.00 41.0 0.0 MH 6 374.5 370.00
6 36"RCP MH 4 357.11 352.00 100.0 0.5 351.50
7 18"RCP 358.00 54.0 1.3 Gl 4 359.50 355.30
8 24"RCP MH 6 374.50 369.80 35.0 0.5 369.62
9 24"RCP GI 1 375.00 370.00 82.0 1.25 369.0
10 18"RCP GI 3 373.50 369.00 100.0 0.5 GI 1 375.00 370.00
11 36"RCP MH 1 362.0 117.0 5.73 GI 4 359.5 355.3
12 36"RCP 366.5 89.0 4.50 MH 1 362.5
13 36"RCP GI 4 359.50 355.0 73.0 3.56 G/ 2 356.59 352.40
\Langston\plans\aj002C-2.dgn 06/25/2002 02:11:46 PM