20071098 Ver 1_More Info Received_20070727

•N
.w E',~ BURDETTE LAND CONSULTING, INC.
308D W Millbrook Road, Sui[e 200 -Raleigh, North Carolina 27609
Telephone [phone] -Fax [phone]
S
July 23, 2007
Mr. Ian McMillan
401 Oversight/Exp Review Permitting Unit
North Carolina Division of Water Quality
2321 Crabtree Boulevard, Suite250
Raleigh, North Carolina 27604
RE: Additional Information Requested
Silver Creek Subdivision
DWQ Project # 07-1098
BLC Project #: 60004
Dear Mr. McMillan:
Zm
77 ....... ,-... '., w' ...
13 t7
. ~ ~ ~, a ,~. -.
:, a ~Uu~
1V ;i(, . . . _r„.
We received NC Division of Water Quality's June 28, 20071etter requesting additional
information for the subject project. As requested, cross-section details for the proposed
crossing and diffuse flow provision measures are shown on the attached project plans
(Sheets C3.2 & C3.3). Worksheets for each proposed level spreader and an Operation
and Maintenance Agreement for them are also attached. It is important to note that due
to several feet difference in elevation between the former pond bottom and the perennial
stream channel located at the base of the dam creating a slope that is much greater than
2%, the culvert pipe was not buried to avoid headcutting of the newly forming stream
channel in the pond bottom.
Also as requested, Figure 4 attached shows the topography of adjoining properties. Two
roads are stubbed at the northern property line. As shown on the attached map, these
road stubs are positioned to provide access to high ground on the adjoining property.

Mr. Ian McMillan
July 23, 2007
Page 2 of 2
If you have any questions or require more information, please do not hesitate to contact
me at [phone].
Sincerely,
BURDETTE LAND CONSULTING, INC.
Q- ~ ~_
Jennifer A. Burdette
Environmental Specialist
Attachments
c: Trenton Stewart -Arcadia Consulting Engineers, PLLC

LEVEL SPREADER SYSTEM OPERATION AND MAINTENANCE AGREEMENT (1/2007)
A level spreader system includes: a forebay, diverter box, level spreader, riparian buffer/vegetated filter strip,
and flow bypass channel.
Name of Project: ~~`-~/~'~,G-f~~~~ ~uU~lVl~lol~
Address: (~ (Zc~ /~1.4L L~/.,~~~5 ~b~ ~~-~'~Gr~, n~G 27foo.3
Maintenance activities shall be performed as follows:
MAINTENANCE ACTIVITY FREQUENCY
Post-construction monitoring-inspect for vegetation, Check after every heavy rainfall for first 6 months
settlin ,erosion, or concentrated flow. followin construction.
Inspect Diverter Box and clean and/or make repairs. Once a month and after heavy rainfalls/storms.
Look for:
• Clogged inlet or outlet pipes.
• Trash/debris in the box.
Inspect Forebay + Level Spreader. Clean and/or Once a month and after heavy rainfalls/storms.
make repairs. Look for:
• Sediment in forebay and along level spreader
lip;
• Trash and/or leaf buildup.
• Scour, undercutting of level spreader.
• Settlement of level spreader structure (no
longer level; you see silt downhill below level
spreader).
• Fallen trees on level spreader.
• #57 stone washin downhill.
Inspect the Riparian Buffer and the Bypass Swale Once a month and after heavy rainfalls/storms.
and make repairs as needed'. Look for:
• Damaged turf reinforcement or riprap rolling
downhill.
• Erosion within the buffer or swale.
• Concentrated flows downhill of level
s reader-look for ullies or sediment flows.
Mow grass to a 6" height. As needed during growing season.
Remove any weeds/shrubs growing on level spreader Once a year.
or in swale.
1 NOTE: Contact NC Division of Water Quality, 401/Wetlands Unit at 919-733-1786 BEFORE any work
in Protected Riparian Buffers.
Page 1 of 2

LEVEL LOCATION ON SITE (DESCRIBE) HOW WILL IT BE ACCESSED?
SPREADER NO.
1 1(~ ,~ Ilp.So ~ ~-/E5T oG t'~4~- I„tE.~Ti~~~ ST¢£~T ".~ ~1Gti N`>"-oF - Ws~ `r
~ ~ ~~r ~~ 5~~r «~ -~ .~,~a ~s.~r~
2 ,~
~, ~SSo LG l~.EsT ~~ I`7LJL YslEbTf~EKS ~ J
~ o~ G-~~T oiF STET' "~''
3 ti ~ ~. lCn S~ ~ ~[E~T of r~AL. t~lE'.u'TN~~s t ~
G i ~7' ~~~`T r,~q ~,
4 1~
~~ tS~D ~ ~~To~ r~A~ 1-+t~r+~.~1~ t1
D oN 7e/ H o~ ~l~ "p ~~
5
6
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance
procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to
the system or responsible party.
Print name: ~~~Y •~. - .,:.lot/.vso~c!
Title: f~i~s/r..~~T~~ ~Jo~t~s 1..4u~~~~, i.~G,
Address: /~.~ ~ryr~~,~~'ic.crF ~.4Je,~ KD. , ~~4~lar`~ ,~S/~ Z7Cpo3
Phone: `~/~I~ 7~Z- 2~I~7
Signature:
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 1,~ , do hereby certify that D'
personally appeared before me this ~ day o ~,y~, and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
~~
SEAL
My commission expires ~ ~~~
Page 2 of 2

DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET (112007)
I. PROJECT INFORMATION (please complete the following information):
Project Name : ~<<-~~~c,~F-~~ SL~~ i v' i S tor`[
Contact Person:-~L~~~Yo~ S~e+G4~?-~" Phone Number: (~ r~) 832 - ~ `7 / ~
Level Spreader ID: "/1"
Level Spreader Length ft. (perpendicular to flow)
Drainage Area ~. o ac. (on-site and off-site drainage to the level spreader)
Impervious Area o. 2 ac. (on-site and off-site drainage to the level spreader)
Forebay Area i 9 . S cu ft. (0.2% of the contributing impervious surface area)
Maximum Filter StriplBuffer Slope ~ . S % (6% #or forested/leaf littler cover, 8% for grass/thick cover)
Max. Discharge from 1 "IHr Storm o - S cfs
Max. Discharge to Level Spreader 3 . Cv _cfs
Filter Strip/ Zone 1 Buffer Vegetation ~ R•ass
Filter Stripl Zone 1 Buffer Width 3~ ft.
Filter Stripl Zone 2 Buffer Vegetation r~~~ _-
Filter Stripl Zone 2 Buffer Width Zo ft•
(Discharge rate from extended detention wetland or pond)
(GrasslThick ground cover or Forested)
Bypass Method Used ,cf/,4 Please include a worksheet for this.
tl. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is
attached. !f a requirement has not been met, please explain why. At a minimum, a complete stormwater management plan
submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet
structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete
submiftal package will result in a request for additional information and will subsfantially delay final review and approval of
the project.
Applicants In_itials_
~~~ Project Site was visited prior to designing level spreader system.
7-i - o Date of the Site visit. Please attach time-dated digital photos of existing buffer conditions.
Level spreader length is at least:13 ft. per cfs for thick ground cover /grass; OR 65 ft per cfs for 50-
footcanopied forest with leaf litter; 50 ft per cfs for 100-foot forested buffer; 40 ft. per cfs for 150-foot
forested buffer; OR a weighted average of the two vegetation types within the buffer/filter strip).
All ground cover types and their widths have been labeled on the construction plans.
~~ All contours have been depicted on the construction plans.
~.~ No structures are located in protected buffers (must meet no practical alternatives criteria).
-~Q~ No draws are located in the buffer or filter strip in the vicinity of the proposed level spreader.
Construction details for the level spreader have been provided.
The operation and maintenance agreement signed and notarized by the responsible party is provided.
~/,¢ No practical alternatives explanation + Variance request. (Level Spreaders in Series only).
Bypass method used:
N,G4 Bypass conveyance method is specified and construction details and calculations are provided.
,~/~ Alternative design option is specified and plan details and calculations are provided.
~/,d
Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the
bypass discharge.
x//~ Construction details for the bypass and outlets are provided.

DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET (112007)
I. PROJECT INFORMATION (please
Project Name ~ ~IG..y'&,~f
the following information):
1
Contact Person: ~ ~,~~~1 STS-~~~-i Phone Number: j~r9t S3Z- ~'7/~
Level Spreader ID: '~ P>"
Level Spreader Length 8Co ft. (perpendicular to flow)
Drainage Area /, 8 ac. (on-site and off-site drainage to the level spreader)
Impervious Area o . 3 ac. (on-site and off-site drainage to the level spreader)
Forebay Area 27 cu ft. (0.2% of the contributing impervious surface area)
Maximum Filter Strip/Buffer Slope /o . S % (6% for forestedlleaf littler cover, 8% for grass/thick cover)
Max. Discharge from 1"IHr Storm ©•~T cfs
Max. Discharge to Level Spreader C~ - 5 cfs
Filter Strip/ Zone 1 Buffer Vegetation i~ mss
Filter Stripl Zone 1 Buffer Width 3o ft.
Filter Stripl Zone 2 Buffer VegetationGrp.4~~s
Filter Stripl Zone 2 Buffer Width 20 ft.
(Discharge rate from extended detention wetland or pond)
(GrasslThick ground cover or Forested)
Bypass Method Used N/-4 Please include a worksheet for this.
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is
attached. If a requirement has not been met, please explain why. At a minimum, a complete stormwater management plan
submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet
structure details, a dekailed drainage plan and a fully executed operation and maintenance agreement. An incomplete
submittal package will result in a requesf for additional information and will substantially delay final review and approval of
the project.
Apalicants Initials
-~,0~ Project Site was visited prior to designing level spreader system.
-7- I.7- 07 Date of the Site visit. Please attach time-dated digital photos of existing buffer conditions.
~p~ Level spreader length is at least:13 ft. per cfs for thick ground cover /grass; OR 65 ft per cfs for 50-
foot cariopied forest with leaf litter; 50 ft per cfs for 100-foot forested buffer, 40 ft. per cfs for 150-foot
forested buffer; OR a weighted average of the two vegetation types within the bufferlfilter strip).
Yp~ All ground cover types and their widths have been labeled on the construction plans.
~Q~ Alt contours have been depicted on the construction plans.
~,~ No structures are located in protected buffers (must meet no practical alternatives criteria).
~Q,~ No draws are located in the buffer or filter strip in the vicinity of the proposed level spreader.
Construction details for the level spreader have been provided.
The operation and maintenance agreement signed and notarized by the responsible party is provided.
~/ No practical alternatives explanation + Variance request. (Level Spreaders in Series only).
Bypass method used:
~v/,4 Bypass conveyance method is specified and construction details and calculations are provided.
,~/~ Alternative design option is specified and plan details and calculations are provided.
~cl/,a Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the
bypass discharge.
~c j~ Construction details for the bypass and outlets are provided.

DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET (112007)
I. PROJECT INFORMATION (please complete the following information):
Project Name : tic-~~~-~~- 511 ~ t v~is t °~1
Contact Person: _-~~^-~T ~ ~TEf.+LA~ _ Phone Number: ~~f) 8~ ~ ~~7
Level Spreader ID: `~ G `'
Level Spreader Length 7~ ft. (perpendicular to flow)
Drainage Area ©. 3 ac. (on-site and off-site drainage to the level spreader)
Impervious Area o. 1 ac. (on-site and off-site drainage to the level spreader)
Forebay Area '7 cu ft. (0.2% of the contributing impervious surface area)
Maximum Filter Strip/Buffer Slope 2.5 % (6% for forested/leaf littler cover, 8% for grass/thick cover)
Max. Discharge from 1"IHr Storm o. 2. cfs
Max. Discharge to Level Spreader 1. - 2-. cfs
Filter Strip/ Zone 1 Buffer Vegetation ~o,¢~s?'
Filter Stripl Zone 1 Buffer Width 3o ft.
Filter Stripl Zone 2 Buffer Vegetation ~~ST
Filter Strip! Zone 2 Buffer Width 2v ft.
(Discharge rate from extended detention wetland or pond)
(GrasslThick ground cover or Forested)
Bypass Method Used h%4 Please include a worksheet for this.
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is
attached. If a requirement has not been met, please explain why. At a minimum, a complete stormwater management plan
submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet
structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete
submittal package will result in a requesf for addifional information and will substantially delay frnal review and approval of
the projecf.
Apalicants Initials
Project Site was visited prior to designing level spreader system.
-7-~7 0~ Date of the Site visit. Please attach time-dated digital photos of existing buffer conditions.
~~~ Level spreader length is at least:l3 ft. per cfs for thick ground cover 1 grass; OR 65 ft per cfs for 50-
foot canopied forest with leaf litter; 50 ft per cfs for 100-foot forested buffer; 40 ft. per cfs for 150-foot
forested buffer; OR a weighted average of the two vegetation types within the buffer/filter strip).
~~ All ground cover types and their widths have been labeled on the construction plans.
~g All contours have been depicted on the construction plans.
~~,8 No structures are located in protected buffers (must meet no practical alternatives criteria).
~p~_ No draws are located in the buffer or filter strip in the vicinity of the proposed level spreader.
Construction details for the level spreader have been provided.
The operation and maintenance agreement signed and notarized by the responsible party is provided.
nU.4 No practical alternatives explanation + Variance request. (Level Spreaders in Series only).
Bypass method used:
N~~ Bypass conveyance method is specified and construction details and calculations are provided.
,u/,~ Alternative design option is specified and plan details and calculations are provided.
X/i1 Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the
bypass discharge.
/y/~4 Construction details for the bypass and outlets are provided.

DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET (112007)
I. PROJECT INFORMATION (please complete the following information):
Project Name : a/L/~~ ~u~~~ ~~5~°~!
Contact Person: -T2~~~ ~`~~/•~~.T _ Phone Number: (9/9) X32- ~7/ 7
Level Spreader ID: "I7"
Level Spreader Length L+Co ft. (perpendicular to flow)
Drainage Area o- Z~ ac. (on-site and off-site drainage to the level spreader)
Impervious Area o • 07 ac. (on-site and off-site drainage to the level spreader)
Forebay Area Co cu ft. (0.2% of the contributing impervious surface area)
Maximum Filter Strip/Buffer Slope 3, 4- % (6% for forestedlleaf littler cover, 8% for grasslthick cover)
Max. Discharge from 1"IHr Storm O • t cfs
Max. Discharge to Level Spreader /~ o f cfs
Filter Strip/ Zone 1 Buffer Vegetation ~a_
Fitter Strip/ Zone 1 Buffer Width .~So ft.
Filter Stripl Zone 2 Buffer Vegetation ~aR~ST'
Filter Strip/ Zone 2 Buffer Width ?~ ft.
(Discharge rate from extended detention wetland or pond)
(GrasslThick ground cover or Forested)
Bypass Method Used /~/~{ Please include a worksheet for this.
ll. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is
attached. If a requirement has not been met, please explain why. At a minimum, a complete stormwater management plan
submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet
structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete
submittal package will result in a request for additional information and will substantially delay frnat review and approval of
the project.
Applicants Initials
'7-/~ 07
~~~
Project Site was visited prior to designing level spreader system.
Date of the Site visit. Please attach time•dated digital photos of existing buffer conditions.
Level spreader length is at least:l3 ft. per cfs for thick ground cover /grass; OR 65 ft per cfs for 50-
footcanopied forest with leaf litter; 50 ft per cfs for 100-foot forested buffer; 40 ft. per cfs for 150-foot
forested buffer; OR a weighted average of the iwo vegetation types within the bufferlfilter strip).
All ground cover types and their widths have been labeled on the construction plans.
All contours have been depicted on the construction plans.
No structures are located in protected buffers (must meet no practical alternatives criteria).
No draws are located in the buffer or filter strip in the vicinity of the proposed level spreader.
Construction details for the level spreader have been provided.
The operation and maintenance agreement signed and notarized by the responsible party is provided.
No practical alternatives explanation + Variance request. {Level Spreaders in Series only).
Bypass method used:
~~{ Bypass conveyance method is specified and construction details and calculations are provided.
,y/,4 Alternative design option is specified and plan detaits and calculations are provided.
~/~ Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the
bypass discharge.
is//4 Construction details for the bypass and outtets are provided.

LEVEL SPREADER "A"
LEVEL SPREADER "B"

LEVEL SPREADER "C"
LEVEL SPREADER "D"

0

L_L_L
T

/~ l I'.
a
~~
J~//~~ ~ °
~,
° ~=

~ d
ti ~

~
%'
~~ ~
o °~
a z~z
3 ~
P ~
H
~
_
-_----~_
-
- Q
A U
v~ ~
A ~
U ~
w ~
w
~
~-~
~~
-~--.

--
~~ H z
U
_
_ ~~ z~
_
~ ~ ~ ~ O
~
v
z

~ ~~~~
H~~

~~ ~
~ 3
~ x
-
._ ~~a~
~
~ ~U~
~O
~` W
>
ti
~~ d
~ ~~ a
~~~ d w
\~ \

' ) ~ /< .
~\ `~~

~l°^_
~~~ \
~~
~ i

~/
~1
Q

U
Z
~o
ih N
~/ C
z~~
~~
[y U °~
a ~~
~ z~
z ~~'
o ~~
v .~
o~
N ~
A ~:~
Z ~~
~~
a ~~
~o
s~
W °'
~~
F
W Q
0
M~ m
!~
•~ .
:Z N;
~
// / ~
~

i
~. / ~_~ ~

~
~_

i
/ // ~/~ ~--

J
Q
W O
~
~ ~ O
~/~ '^~
\ UM
/ ` a `~
g
a
C7
0
~ ~ -~
~
~ -~ j j Q
A.

/ / ~
)eery /~~C ~/ i
9~%~
\~
~~~~~
~~
'))~~~
~~ '//~ V ~
~',
~.
r