20060961 Ver 1_Stormwater Info_20070615

WITHERS ~`1:: RAVEN EL
ENGINEERS I PLANNERS I SURVEYORS
iii MacKenan Drive I Cary, North Carolina 275ii
te1:919.469.334o I fax: [phone]
www.withersravenel.com
~ L Ko-T~1
~~~~~Q ~~ ~~Q~~~D~~Q~
DATE
~,~ a oo~ .105 NO.
ao~+oy.e-t`
ATTENTION
k ro v~wQ. L
REr
Vlo We.2.G S}o~....wa, ee• W` i

t~ -~9~-

WE ARE SENDING YOU ^ Attached ^ Under separate cover via the following items:
^ Shop drawings ^ Prints ^ Plans ^ Samples ^ Specifications
^ Copy of fetter ^ Change order ^ Diskette ^
COPIES DATE NO. DESCRIPTION
o~ VO LP o~.v.S ~.o„t

r~.,
~rKS:~ ~ ~ ~~,.,~ , ~„~
~ ?,
~~ 4 ... ... : ~
~I I , i~
u : , ~ ~
r:ir
i;.
THESE ARE TRANSMITTED as checked below: t~~' `"''
~ For approval ^ Approved as submitted ^ Resubmit copies for approval
^ For your use ^ Approved as noted ^ Submit copies for distribution
> ^ As requested ^ Returned for corrections ^ Return corrected prints
^ For review and comment ^
^ FOR BIDS DUE 20 ^ PRINTS RETURNED AFTER LOAN TO US
REMARKS e-~ ~~ ~ Ewa 'A ~~~~-
,VI O..~aLN~ ~~ S c6~• V~4,W
a..~..•:,~~ L~
COPY TO ~ : ~.
~K~ 40%Pre-Consume~Coment•70°bPOSt-Consumer Content SIGNER:-'-~ooa pC,v~,L~~LT"'
If enclosures ere not as noted, kindly notify us st once.

Michael F. Easley, Governor
William G. Ross )r., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
~ Division of Water Quality
August 7, 2006
R
~C~I V~~ DWQ Project # 06-0961
Mr. Julian Raul AUK 1 ~ ?00~ Wake County
Wexford Developers, LLC W%th~,
100 Weston Estates Way rs ~ h'av
Cary, NC 27513 ene~
Subject Property: 40/Wade
Ut to Richlands Creek [030402, 27-33-11, C, NSW]
Approval of 401 Water Quality Certification and Authorization Certificate per the Neuse River
Buffer Protection Rules (15A NCAC 2B .0233) with Additional Conditions -REVISED
Dear Mr. Raul:
You have our approval, in accordance with the attached conditions and those listed below, to place fill
within or otherwise impact 0.032 acres of wetland, 3141inear feet perennial stream (252 linear feet
permanent impacts, 62 linear feet temporary impacts), 37,904 square feet (ft2) of protected Zone 1 Neuse
River basin riparian buffer and 26,470 square feet ( ) of protected Zone 2 Neuse River basin riparian
buffer as described in your application dated June 12, 2006, and received by the Division of Water
Quality (DWQ) on June 12, 2006, with more information received from you on Jtily 6, for the purpose of
constructing the residential subdivision, commercial development and accompanying utilities at the site.
After reviewing your application, we have decided that the impacts are covered by General Water Quality
Certification Number(s) 3374 and 3402 (GC3374 and GC3402).' The Certification(s) allows you to use
Nationwide Permit(s) NW12 and~NW39, respectively, when issued by the US Army Corps of Engineers
(USAGE). This letter shall also act as your approved Authorrzation Certificate for impacts to the
protected riparian buffers per 15A NCAC 2B .0233. This Certificatioa replaces the Certification
issued to you on May 16, 2006. In addition, you should obtain or otherwise comply with any other
required federal, state or local permits before you go ahead with your project including (but riot limited
to) Erosion and Sediment Control, and Non-discharge regulations. Also, this approval to proceed with
your, proposed impacts or to conduct impacts to waters as depicted in your application shall expire
upon expiration of the 404 or CAMA Permit.
This approval is for the purpose and design that you described in your application... If you change your
project, you must notify us and you may be required to send us 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 conditions. If total fills for this project (now or in the future) exceed one- acre of
wetland or 1501inear feet of stream, compensatory mitigation may be required as described in 15A
NCAC 2H .0506 (h)., This approval requires you to follow the conditions listed in the attached
certification and anyadditional conditions listed below.
The Additional Conditions of the Certification are:
1. Impacts Approved
401 Oversight/Express Review Permitting Unit
~~~
1650 Msil Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard. Suite 250, Raleigh, North Carolina 27604
Phone: [phone] /FAX [phone] /Internet: http://h2o.enr.state.nc.us/ncwetlands

40/Wade
Page 2 of 6
August 7, 2006
~'he following impacts are hereby approved as long as all of the otli~r specific and general
conditions of this Certification (or Isolated Wetland Permit) are met' No other impacts are
approved including incidental impacts:
Amount A roved nits Plan Location or Refen
404/Wetland 0.032 acres . • ' ~ PCN a e 4 of 9
Stream -perennial 3141inear feet stream t2521ine~r feet permanent impacts, 621inear feet PCN page 4 of 9
tem r im acts '
Buffer-Zone 1 37 904 s uare ft. PCN a e 8 of9
Buffer-Zone 2 26,470 s uare ft. PCN a e 8 of 9
2. No Waste, Spoil, Solids, or Fill of Any Kind
No waste, spoil, solids, or fill of any kind shall occw in wetlands, waters, or riparian areas beyond
the footprint of the impacts depicted in the Pre-Construction Notification. All construction
activities,. including the design, installation, operation, and maintenance of sediment and erosion
control Best Management Practices, shall be performed so that no violations of state water quality
standards, statutes, or rules occur.
3. 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 tie such'that they equal, or exceed, the requirementsspecified 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,
iricluiling contactor-owned or leased'borrow pits associated with the project.
c. Sufficient materials required for stabilization and/or 'repair of erosion control' measwes and
stormwater routing and treatment shall be on site at all times.
4. Sediment and`Erosion control Measures.
Sediment and erosion control measures shall not be placed in wetlands or waters #o the maximum
extent practicable. If placement of sediment and erosion control devices in wetlands and waters is
unavoidable, they shall be removed and the natural grade restored within six months of the date that
the Division of Land Resources has released the'project;
5. Protective Fencing
The outside buffer, wetland or water boundary and along the construction corridor within these ''
boundaries approved under this authorization shall be clearly marked with orange warning fencing
. (or similar high visibility material) for the areas that have been approved to infringe within the
buffer, wetland or water prior to any land disturbing activities to enswe compliance with 15A
~~ NCAC 2B .0233 and GC 3404;

40/Wade
Page 3 of 6
August 7, 2006
6. Culvert Installation

Culverts required for this project shall be installed in such a manner that the original stream profiles
are not altered. Existing stream dimensions (including the cross section dimensions, patfern, and
longitudinal profile) must be maintained above and below locations of each culvert. 'Culverts shall
be designed and installed to allow for aquatic life movement as well as to prevent head cutting of
the streams. If any of the existing pipes are or become perched, the appropriate stream grade shall
be re-established or, if the pipes installed in a perched manner, the pipes shall be removed and re-
installed correctly.
Culvert(s) shall not be installed in such a manner that will cause aggradation or erosion of the
stream up or down stream of the culvert(s). Existing stream dimensions (including the cross section
dimensions, pattern and longitudinal profile) shall be maintained above and below locations of each
culvert.
Placement of culverts and other structures in waters, streams, and wetlands must 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
disequilibrium 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 shall be
maintained if requested in writing by DWQ.
The establishment of native, woody vegetation and other soft stream bank stabilization techniques
must be used where practicable instead of rip rap or other bank hardening methods. If rip-rap is
necessary, it shall not be placed in the stream bed, unless specifically approved by the Division of
Water Quality.
Installation of culverts in wetlands must ensure continuity of water movement and be designed
to adequately accommodate high water or flood conditions.
Upon completion of the project, the Applicant shall complete and return the enclosed "Certificate of
Completion" for,!n to notify' NCDWQ when all work included in the §401 Certification has been
completed. The responsible party shall complete the attached form and return it to the
401/Wetlands Unit of the NC Division of Water Quality upon completion ofthe project. Please
send photographs upstream and downstream of each culvert site to document correct installation
along with the Certificate of Completion form.
7. Written Stormwater Management Plan (Final Plan Needed) Required For Each Phase
A final, written stormwater management plan ,(including a signed and notarized Operation and
Maintenance Agreement) for each phase of the entire project shall be submitted to the 401
Oversight and Express Permitting Unit (2321 Crabtree Blvd., Suite 250, Raleigh, NC, 27604) and
the stormwater management plans shall be approved in writing by this Office before the impacts
for that particular phase tnay occur per Condition No. 4 in GC No. 3402. You have the option
of using the Express Review Program' for expedited approval of these plans. 'If you propose to
use the Express Review Program, remember to include the appropriate fee with the plan. Site-
specific stormwater management shall be designed` to remove 85% TSS according to the latest
version of DWQ's Stonmwater Best Management Practices manual at a minimum. Additionally,
in watersheds within one mile and draining to 303(d) listed waters, as well as watersheds that are

40/Wade
Page 4 of 6
August 7, 2006
classified as nutrient sensitive waters (NSW), water supply waters ('DVS), trout waters (Tr), high
quality waters (HQW), and outstanding resource waters (ORW), the Division shall require that
extended detention wetlands, bio-retention areas, 'and ponds followed by forested filter strips
(designed according to latest version of the NCDENR Stormwater Best Management Practices
Manual) be constructed as part of the stormwater management plan when asite-specific
stormwater management plan is required.
Also, the stormwater management plan (as approved by the Wetlands Unit) shall be implemented
before any permanent building or other structure is occupied at the subject site.
The structural stormwater practices as approved by the Wetlands Unit as well as drainage patterns
must be maintained in perpetuity. No changes to the structural stormwater practices shall be
made without written authorization from the Division of Water Quality.
8. Diffuse Flow (No Review)
All constructed stormwater conveyance outlets shall be directed and maintained as diffuse flow at
non-erosive velocities through the. protected stream buffers such that it will not re-.concentrate
before discharging into a stream as identified within 15A NCAC 2B .0233 (S). >f this is not
possible, it may be necessary to provide stormwater facilities that are considered to remove
nitrogen. This may require additional approval from this Office.
Miti ation:
9. Compensatory Mitigation Using the Ecosystem Enhancement Program.. (EEP)
Mitigation must be provided for the proposed impacts as specified in the table below. We
understand that you wish to make a payment to the Wetlands Restoration Fund administered by
the NC Ecosystem Enhancement Program (EEP) to meet this mitigation requirement. This has
been determined by the DWQ to be a suitable method to meet the mitigation requirement. Until
the EEP receives and clears your check (made payable to: DENR -Ecosystem Enhancement
Program Office), no impacts specified in this Authorization'Certificate shall occur. The EEP
should be contacted at (919).733-5205 if you have any questions concerning payment into a
restoration fund. You have one month from the,date of this approval to make this a meat. For
accounting purposes, this Authorization Certificate authorizes payment into th Wetlands
Restoration Fund to meet the`fohowing compensatory mitigation requirement:
compensatory Mitigation River and Sub-basin Number
Re uired
Stream 1.95, linear feet Neuse/03Q20201
Buffer Zone l 55,284 s uare feet Neuse/03020201
Buffer Zone 2 .21,576 s care feet Neuse/Q~02020.1
10. Deed Notifications
,Deed notifications or similar mechanisms shall be placed on all. retained jurisdictional wetlands,
waters and protective buffers. in order to assure compliance for future wetland, water and buffer
~~ impact., These mechanisms shall be put in place prior. tp impacting;any wetlands, waters and/or
buffers approved for..impact under this Certification Approval. and Authorization Certificate. A
sample deed notification can be downloaded from the 401/Wetlands Unit web site at
~i
'i
!~
r~
~. ~ki
:_ .~
... yi

40/Wade
Page 5 of 6
August 7, 2006
http://h2o.enr.state.nc.us/ncwetl~nds. The text of the sample deed notification may be modified
as appropriate to suit to this project;
11. Sewer Systems
The project shall comply with 15A NCAC 2H .0219(i)(2)(G) and all other State, Federal and local
sewer system regulations.
12. Construction Stormwater Permit NCGO10000
Upon the approval of an Erosion and Sedimentation Control Plan issued by the Division of Land
Resources (DLR) or a DLR delegated local erosion and sedimentation control program, an
NPDES General stormwater permit (NCGO10000) administered by DWQ is automatically issued
to the project. This General Permit allows stormwater to be discharged during land disturbing
construction activities as stipulated by conditions in the permit. If your project is covered by this
permit [applicable to construction projects that disturb one (1) or more acres], full compliance
with permit conditions including the sedimentation control plan, self-monitoring, record keeping
and reporting requirements are required. A copy of this permit and monitoring report forms may
be found at http://h2o.enr.state.nc.us/su/Forms Documents.htm.;
13. Certificate of Completion
Upon completion of all work approved within the 401 Water Quality Certification or applicable
Buffer Rules, and any subsequent modifications, the applicant is required to return the attached
certificate of completion to the 401 Oversight/Express Review Permitting Unit, North Carolina
Division of Water Quality, 1650 Mail Service Center, Raleigh, NC, 27699-1650.
Violations of any condition herein set forth may result in revocation of this Certification and may result in
criminal and/or civil penalties. The authorization to proceed with your proposed impacts or to conduct
impacts to waters as depicted in your application and as authorized by this Certification, shall expire upon
expiration of the 404 or CAMA Permit.
If you do not accept any of the conditions of this Certification (associated with the approved wetland or
stream impacts), 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, which conforms to Chapter 150E of
the North Carolina General Statutes to the Office of Administrative Hearings, 6714 Mail Service Center,
Raleigh, N.C. 27699-6714. This certification and its conditions are final and binding unless you ask for a
hearing.
Any disputes over determinations regarding this Authorization Certificate (associated with the approved
buffer impacts) shall be referred in writing to the Director for a decision. The Director's decision is
subject to review as provided in Articles 3 and 4 of G.S. 150B.

40/Wade
Page 6 of 6
August 7, 2006
This letter completes the review of the Division of Water Quality under Sec~on 401 of the Clean Water
Act and the Neuse riparian buffer protection rule as described within 1 SA NCAC 2B .0233. If you have
any questions, please telephone Cyndi Karoly or Ian McMillan at 919-733-1786.
Sincerely,
A WK/~m
Alan W. Klimek, P.E.
Enclosures: NCDWQ 401 WQC Summary of Permitted Impacts and Mitigation Requirements
GC 3374, GC3402
Certificate of Completion
cc: USACE Raleigh Regulatory Field Office
Eric Kulz, DWQ Raleigh Regional Office
DLR Raleigh Regional Office
File Copy
Central Files
Todd Preuninger, Withers and Ravenel Inc.,
117 MacKenan Drive, Cary, NC 27511
Filename: 066961 FortyWade(Wake)401_NBR

STORMWATER CONTOL STRUCTURE
BIO-RETENTION MAINTENANCE AGREEMENT
PROJECT: Wade Roadway Phase II - BMP 9A
RESPONSIBLE PARTY: W-2X-(~e'~OIII I~~Y'~.~~1,(.a(.I'.CPHONE #:~Iti-~~~ -.3~~
ADDRESS: I ~ V~/~~~ ~S~la.-~e5 ~(ay /
Monthly or after every runoff producing rainfall, whichever comes first:
a. Remove debris from bio-retention area.
b. Inspect for ponding, washed-out areas, and soil conditions.
c. Check for eroded areas of bio-retention area and repair before next rainfall.
d. Check vegetation conditions within the bio-retention area and replace if necessary any damaged
plant materials.
II. Quarterly
a. Inspect the collection system (i.e., catch basin, piping, grassed swales) for proper functioning.
Clear accumulated trash from basin grates, and basin bottoms, and check piping for obstructions.
b. Check pond inlet pipes for undercutting. Repair if necessary.
c. Repair any broken pipes.
d. Remulch any void areas by hand whenever needed.
e. Replace rip rap at out let pipe that is choked with sediment.
III. Semi-Annually
a. Reseed grass swale or border twice yearly.
b. Apply new mulch twice yearly.
_ P
I, ~ „~ ~~ ~~~ hereby acknowledge that I am the financially responsible party for
maintenance of this impoundment. I will perform the maintenance as outlined above, as part of the Certificate
of Compliance with Stormwater Regulations received for this project.
Signature: Date: ~-~ ~ Z, Z°y~
I, Lo~r~o`~.. ~~4.,nSO~ a Notary Public for the State of N or-~ Casy~~~ County of ~c.~--e... ,
do hereby certify that T~r~ 5,w~~ personally appeared before me this 12 day of
~~n e_ 2`';'~9- and acknowledge due execution of the foregoing instrument. Witness my
hand and official seal,
~~ ~ ~~~
Seal
``~~~. P p . J O yN~,~''''.
. Q.
ckc ' ~ O
Maintenance Agreement ? v 2
NOTARY e
°_ PUBLIC €
s`L ~
,,,~ ~ ~ ~ ~', ~~ c O U N ~ y ` ` ` ````~ ~~,
9 ~
My commission expires: ~.~ ~ 22 r Z ~ tZ

BMP 9B -WADE ROADWAY PHASE II
WETLAND DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
The wetland detention basin system is defined as the wetland basin, pretreatment including forebays and the
vegetated filter if one is provided.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wetland detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wetland detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality
(i.e. stockpiling near a wetland detention basin or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads , _ ~ ;eet in the main pond, the sediment shall be removed.
If the elevation of the marsh areas exceed the permanent pool elevation, the sediment should be removed
to design levels. This shall be performed by removing the upper 6 inches of soil and stockpiling it. Then
the marsh area shall be excavated six inches below design elevations. Afterwards the stockpiled soil
should be spread over the marsh surface. The soil should not be stockpiled for more than two weeks
When the permanent pool depth reads D •`l~ feet in the forebay and micro-pool, the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 380.5
Sediment moval EI. q • 7 /o
-------------- -- o Sediment Removal Elevation 380.5
-------------------------------------------- ------
Bottom E vation 377.5 5 /o
Bottom Elevation 379 Low Marsh 379.75 ~ h M i
FOREBAY/MICROPOOL MAIN POND
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm. Wetland planting
Page 1 of 2

densities in the marsh areas should be maintained by replanting bare areas as needed. Wetland plants
should be encouraged to grow in the marsh areas.
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
7. All components of the wetland detention basin system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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: `~`'`- ~~~ ~~
Title: M+~~-
Address: 100 ~.~ STV ~ ~5-r~-,•Zc5 t~,a-.., C/i~-~, N ~ • °Z? S ~ 3
Phone: `~l 5 - 4 !~I ~' 3co v
Signature: ~ ~~~ ~~c~/~
Date: 2 d ~
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, ~~O~C1G- D S~~ns~ , a Notary Public for the State of 1~1u~~ C'~CUI~~r~. ,
County of V~C~.~ , do hereby certify that II 5wt.~~-h
personally appeared before me this 12 day of ~, ~~ , Zt~7, ,and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal, ~ ~--
.~ -- ~~
~ so ,
~~ 2
NOTARY
PUBLIC
' 9 ~'
SEAL
My commission expires I~~ ~ ZZ. 2~ ~~--•
Page 2 of 2

DWQ Project No.
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : Wade - Roadway Phase II
Contact Person: Stephanie Hall, PE, CFM Phone Number: (919 )469-3340
For projects with multiple basins, specify which basin this worksheet applies to: BMP 9A
Permanent Pool Elevation Surface: 370 ft. (elevation of the orifice invert out)
Temporary Pool Elevation 370.5 ft. (elevation of the outlet structure invert in)
Bioretention Surface Area 8100 sq. ft.
Drainage Area 4.29 ac. (on-site and off-site drainage to the basin)
Impervious Area 2.79 ac. (on-site and off-site drainage to the basin)
Rational C Coefficient 0.70
Size % 5% % (either 5% in w/sand under drain or 7% in w/o)
Inlet Velocity <1 fps
Inlet flow depth 1 in
Depth to Ground Water +20 ft.
Planting Soil Infiltration Rate 1 in./hr. (the soil layer down to 4 feet)
In-Situ Soil Infiltration Rate Approx 0.63 in./hr. (the soil layer below 4 feet or below the sand bed)
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, attach an explanation of 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 final review and approval of the project.
Aoolicants Initials
SH No vertical sand bed is proposed
SH The bioretention area is at least 40 feet by 15 feet.
SH Sheet flow is provided at inlet.
SH Water table depth is greater than 6 feet.
SH Minimum of 6" ponding is provided.
SH The ponded area will draw down in less than 4 days.
SH Planting soil infiltration rate is greater than 0.52 in/hr.
SH The in-situ soil infiltration rate is greater than 0.2 in/hr.
SH A planting plan with species and densities is provided.
SH Mulch layer is specified in plans.
SH Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
SH Plan details for the bioretention area provided.
SH Plan details for the inlet and outlet are provided.
SH An operation and maintenance agreement signed and notarized by the responsible party is provided.
Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains

DWQ Project
DIVISION OF WATER QUALITY - 401 EXTENDED DETENTION (and POCKET*) WETLAND WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : Wade Roadway Phase II
Contact Person: Stephanie Hall, PE, CFM Phone Number: [phone]
For projects with multiple basins, specify which basin this worksheet applies to: BMP 96
Permanent Pool Elevation 380.5 ft. (elevation of the orifice invert out)
Temporary Pool Elevation 382 ft. (elevation of the outlet structure invert in)

Permanent Pool Surface Area 20,181 sq. ft. (water surface area at permanent pool elevation)
Drainage Area 17.46 ac. (on-site and off-site drainage to the basin)
Impervious Area 11.3 ac. (on-site and off-site drainage to the basin)
Forebay Surface Area 3.028 sq. ft. (at permanent pool elevation approximately 15%)*
Marsh 0"-9" Surface Area 7.063 sq. ft. (at permanent pool elevation approximately 35%)*
Marsh 9"-18" Surface Area 7,063 sq. ft. (at permanent pool elevation approximately 35%)*
Micro Pool Surface Area 3,027 sq. ft. (at permanent pool elevation approximately 15%)*

Temporary Pool Volume 32.865 cu. ft. (volume detained on top of the permanent pool)

SA/DA used 2.64 (surface area to drainage area ratio)*
Diameter of Orifice 3 in. (draw down orifice diameter)
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, attach an explanation of 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 final review and approval of the project
Aoolicants Initials
SH The temporary pool controls runoff from the 1 inch rain.
SH The basin side slopes are no steeper than 3:1.
SH A planting plan for the marsh areas with plant species and densities is provided.
SH Vegetation above the permanent pool elevation is specified.
SH An emergency drain is provided to drain the basin.
SH The temporary pool draws down in 2 to 5 days.
SH Sediment storage is provided in the permanent pool.
SH A sediment disposal area is provided.
SH Access is provided for maintenance.
SH A site specific, signed and notarized operation and maintenance agreement is provided.
SH The drainage area (including any offsite area) is delineated on a site plan.
SH Access is provided for maintenance.
SH Plan details for the wetland are provided.
SH Plan details for the inlet and outlet are provided.
SH A site specific operation and maintenance agreement, signed and notarized by the responsible party is provided (see
http://h2o. eh nr.state. nc.us/ncwetland s/oand m.doc).
* Pocket Wetlands have different design parameters and are only assumed to remove 35% TSS - See pp.19and 20 of the NC DENR
stormwater BMP Manual, April 1999. 10% open water, 50% high marsh, 40% low marsh.