SW7030814_HISTORICAL FILE_20200512

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. SW
DOC TYPE k ❑ CURRENT PERMIT
❑ APPROVED PLANS
HISTORICAL FILE
DOC DATE ,=Of2�
YYYYMMDD

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
BRIAN WRENN
Acting Director
NORTH CAROLINA
Envlroamental Quality
May 12, 2020
Dare County Schools
Attention: Mr. Russ Gurganus, Facilities Director
P.O. Box 1508
Nags Head, NC 27959
Subject: Stormwater Permit Renewal
Stormwater Management Permit SW7030814
Manteo Middle School
Dare County
Dear Mr. Gurganus:
A Division of Energy, Mineral, and Land Resources file review has determined that
Stormwater Permit SW7030814 for a stormwater treatment system consisting of
infiltration basins and bioretention basins serving the Manteo Middle School located on
US Hwy 64/264 in Manteo, NC expires on November 2, 2020. This is a reminder that
permit renewal applications are due 180 days prior to expiration. We do not have a
record of receiving a renewal application.
Please submit a completed permit renewal application along with a $505.00 fee for
permit renewal. Also, it was noted in the file review that a designer's certification that the
project was constructed in accordance with the approved plans as required by the
permit has not been submitted. Please include this with your application. Permit
application forms for renewal can be found on our website at:
https:'//deg,ncsggy�a outJ_division-s4=rgy-mineral-land-resources/energy-mineral-land-
rules/stormwater-arofram/host-construction. North Carolina General Statutes and the
Coastal Stormwater rules require that this property be covered under a stormwater
permit. Failure to maintain a permit subjects the owner to assessment of civil penalties.
If you have questions, please feel free to contact me at [phone]. 1 will be glad to
discuss this by phone or meet with you. If you would like, I can e-mail you a copy of the
application form. You can request a copy by e-mailing me at [e-mail].
Sincerely,
/c
Roger K. Thorpe
Environmental Engineer
01.0-1 EQ�� North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
_ Washington Regional Office 1 943 Washington Square Mall I Washington, North Carolina 27889
252.946.6481

i'
�I 07 1 L L'I U
October 2, 2000
Mr. Alton Hodge
NCIDENR
Division of Water Quality
943 Washington Sy Mall.
Washington, NC 27889
Dear T%fr. I -lodge,
TkeCWa "If -
SUBJECT: MANTEO MIDDLE SCI-IOO.L. RAINGARDEN INITIATIVE,
Pursuant to NC Administrative Code 15A NCAC 21-1.0200 \\paste Not Discharged to Surface Waters,
and on behalf of Dare County Board of Education, Inc., Bissell Professional Group requests review
of the proposed raingarden initiative for the approved stortrtwater management network currently
servicing the Manteo Middle School, DWQ permit # SW7030814. The proposal consists of
proposed plantings within (2) existing infiltration basins, (labeled as basins it & B for this request).,
for use as an educational tool to the middle school students. Pursuant to our conversation on
September 14, 2006, a review has been conducted on the number and size of plantings and their
effect on infiltrative capacity of the underlying soil.
Based upon the stormwater demonstration garden plans prepared -by !,`athy Mitchell of the Nor,h
Carolina Aquarium, in conjunction with the plant type & associative rootball diameter, calculations
were performed to assess the impact of introduction of the plantings topsoil fou,id-,mun into the. in -
situ Bavrneade soils. This process entailed the addition of the surface area each individual roothall
diameter and multiplying the aurface area by the number of planr;.ngs. A safety factor of 10 was
applied to the overall surface area with an anticipated infiltration rate of 0.50 in/hr., (to account for
possible lower infiltration rates, larger surface areas, etc.). These areas were then compi;cd with the
in -situ soil infiltration rates and surface area to calculate anticipated drawdo:vn of each basin. It was
determined that based on the revised exhibits, in conjunction nth the specified number of plantings
per basin, (see attached spreadsheet), would be capable of dra\tzng down the entire basin volume
within a -'-)!-day period, please note, that each basin has been designed & cot:structed to handle in
excess of a 10-year- 24-hr design storm event and that the drawdown ,period has been calculated
based upon the overall basin volumes.
Attached for your review are an updated Stormwater permit application, exhibits identifying the
proposed type, number & locations of the plantings, supporting calculations, and a copy of the most
recent approved permit and inftltration supplements. If you require any additional information or if
we may be of assistance to you in any �vay, please do not hesitate to contact our. office. We thank
you for your time and consideration of this matter.
Sincerely,
1 avid M. Ryan, P.E.�'rj'�'
Project Engineer
Bissell Professional Group W
cc: , Jan Del3lieu
P.O. Box 1068 ■ 3512 N. Croatan Hwy. ■ Kitty Hawk, NC 27949
252-261-3266■ Fax:[phone] F-mail:[e-mail]

OCT - 3 2006
ILLUSTRATION 5 DWQ-WARD

MMS Stormwater Demonstration Gardens
Preliminary Plans
7-12-06
prepared by Kathy Mitchell, NC Aquarium
-----------------------------------------------------------------
KEY
Large deciduous tree
Large evergreen tree
Small tree
Large shrub
Medium -small shrub
Mixed perennials & grasses
Mixed grasses (erosion border)
Mowed turf

MMS Stormwater Demonstration Gardens
Preliminary Plans
7-12-06
prepared by Kathy Mitchell, NC Aquarium
Potential Native Plant Selections
Large Trees (30'-60')
River Birch
Sweetbay Magnolia
Bald Cypress
Red Cedar
Sweet Gum
Black Gum
Swamp Oak
Water Oak
Cherrybark Oak
American Elm
Hickory
Red Maple
Large Shrubs (10'-18')
Wax Myrtle
Yaupon
Arrowwood Viburnum
Possumhaw Viburnum
Silky Dogwood
Groundsel Bush
Small to Medium Shrubs (4'- 8')
Red Chokeberry
Beautyberry
Sweet Pepperbush
Virginia Sweetspire
Inkberry
Dwarf Sumac
Highbush Blueberry
Swamp Rose
Small Trees (12'-25')
Persimmon
Serviceberry
Redbay
Pawpaw
Carolina Willow
Carolina Ash
Fringetree
Parsley Hawthorn
Red Buckeye
Mixed Perennials
Blue Flag Iris
Wild Bergamot
Boltonia
New England Aster
Seashore Mallow
Swamp Sunflower
Goldenrod
Joe Pye Weed
New York Ironweed
Black -Eyed Susan
Blue Wild Indigo
Gaillardia
Lance -leaf Coreopsis
Mixed Grasses
Switchgrass
Purple Muhly
Bushy Broomsedge
Little Bluestem
River Oats
*Saltmeadow Cordgrass
*Erosion barrier only

4RECEOVED
OCT - 3 2006
Manteo Middle School C�
Proposed Tree & Shrub - Root Ball Diameter & Height D9�! Q-WARD
Basin #1
Container Size
# of plants
Diameter inches
Height
Surface Area s.f.
Volume c.f.
Total Surface Area s.f.
Total Volume c.f.)
15G
2
16.5
12
1.48
1.48
2.97
2.97
10G
2
14
11
1.07
0.98
2.14
1.96
7G
4
13
10
0.92
0.77
3.69
3.07
5G
2
11
9
0.66
0.49
1.32
0.99
3G
46
10
8
0.55
0.36
25.08
16.72
2G
3
8
7.5
0.35
0.22
1.05
0.65
1 G
30
6.5
6
0.23
0.12
6.91
3.45
43.14
29.81
Basin #2
Container Size
# of plants
Diameter inches
Height
Surface Area s.f.
Volume c.f.
Total Surface Area s.f.
Total Volume (c.f.
15G
2
16.5
12
1.48
1.48
2.97
2.97
10G
7G
2
13
10
0.92
0.77.
1.84
1.54
5G
3G
32
10
8
0.55
0.36
17.44
11.63
2G
1 G
12
6.5
6
0.23
0.12
2.76
1.38
25.02
17.52

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MANTEO MIDDLE SCHOOL
STORMWATER DEMONSTRATION GARDENS
Preliminary Plan; �KTI•+ �qt,;�,�
Basin A
Revised 9-29-06
opilVA' CS f = �_
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NC Aquarium
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MANTEO MIDDLE SCHOOL
STORMWATER DEMONSTRATION GARDENS
Preliminary Plan
Basin 13
7-12-06
Kathy Mitchell
NC Aquarium
5: o ���� f ;,,,4 --#- 1 A -- se e s e e7L C4• /
ti
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09w:(15:2(106 10:19 FAX [phone] -';C SEA IIAINT
Zool
Coastal studies institute
UNIVERS17Y OF ,`ORTfl CAROr_1NA
F21X
PO Sox 699
217 $udl.eigh Street
Manteo, North Carolina 27954
Phone [phone]
FAX [phone]
TO: Al Hodge
FROM: Nancy White; UNC-Coastal Studies lnstit
DATE: 9/5106
Fax #: [phone] S
# of Pages (incl cover): 10
Preliminary Plans
For the Manteo Middle School Stormwater
Demonstration Gardens.

%9%Q5 2006 10:19 FAX :[phone] , ' INC 5EA GR.A-�T
Q00:
MMS Stormwater Demonstration Gardens
Preliminary Plans
7-12-06
prepared by Kathy Mitchell, NC Aquarium
Potential Native Plant Selections
Large Trees OV-60)
River Birch
Sweetbay Magnolia
Said Cypress
Red Cedar
Sweet Gum
Black Gum
Swamp Oak
Water Oak
Cherrybark Oak
American Elm
Hickory
Red Maple
Large Shrubs (iV-1e')
Wax Myrtle
Yaupon
Arrowwood Viburnum
Possumhaw Viburnum
Silky Dogwood
Groundsel Bush
Small to Medium Shrubs (4.'- 8')
Red Chokeberry
Beautyberry
Sweet Pepperbush
Virginia sweetspire
Inkberry
Dwarf Sumac
Highbush Blueberry
Swamp Rose
Small Trees (12'-25')
Persimmon
Serviceberry
Redbay
Pawpaw
Carolina Willow
Carolina Ash
Fringetree
Parsley Hawthorn
Red Buckeye
Mixed Perennials
Blue Flag Iris
Wild Bergamot
Boltonia
New England Aster
Seashore Mallow
Swamp Sunflower
Goldenrod
Joe Pye Weed
New York lronweed
Black -Eyed Susan
Blue Wild Indigo
Gaillardia
Lance -leaf Coreapsis
Mixed Grasses
Switchgrass
Purple Muhly
Bushy Broomsedge
Little Bluestem
River Oats
-Saltmeacfaw Cordgmss
'Erosion barrier only

n9i')5,2008 10:19 FAX [phone] NC SEA GRANT,
I
I MANTEO MIDDLE SCHOOL
STORNIWATER DEMONSTRATION GARDENS
Preliminary Plan. -
Basin 1
7-12-06
Kathy Mitchell
NC Aquarium
zou
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0
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A/05/2006 10:19 FAX 9-5-9441TJ03 NC SEA GRANT Z005
MANTEO MIDDLE SCHOOL
STORMWATER DEMONSTRATION GARDENS
Prefirnir�iry Plor.;
13ig.n 2
a
Nc
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k

S�9':05.2006 10:20 Fat 2524417403
\C sE-1 GRa.NT Z 006
MMS Stormwater Demonstration Gardens
Preliminary Plans
7-12-06
prepared by Kathy Mitchell, NC Aquarium
I:4WA
C. o
Large deciduous tree
Large evergreen tree
Small tree
Large shrub
Medium -small shrub
f m
f
Mixed perennials & grasses
Mixes! grasses (erosion border)
Mowed turf

OW 05.2006 10:20 FAX 252441 l01 Nc: SEA GRANT Z0117
MMS $tormwater Demonstration Gardens
Preliminary Plans
7-12-06
.prepared by Kathy Mitchell, NC Aquarium
Plant Quantities & Cost Estimates
Basin # 1
Quantity
Estimated cost
Lar e trees
1 9
$30
$120
Small trees
9
$2Q
$180
Shrubs 1
84
$12
$1008
LKxed perennials
grasse$ `
$1100
Mixed erosion
grasses
LLrlvyv wj %.%w i I _
r:S. M r:.W
Quantity
; Estimated cost
Large trees
4
$80
$12Q
Small trees
2
$20
$40
Shrubs
0
$12
$480
Mixed perennials
& wasses
80
; $3
$240
Mixed erosion
Igrasses

10:20 FAX [phone] NC SEA GRANT Z 0(18
MANTEIO MODLE SC1400L
STORMWATER DEMONSTRATION GARDENS
F're; illjv P!3r.:
HC AQUdnum
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IV

T46 GoA�taxperts
Hand Delivered ❑ Over-Nite Mail E] Faxed ❑ Mailed
To: Mr. Bill Moore Date: October 31, 2006
NCDENR
943 Washington Square Mall
Washington, NC 27889
Project: Manteo Middle School
Raingarden Initiative
We Transmit:
Herewith:
FOR YOUR:
x approval
review & comments
use
other
Copies
1
2
Description
Infiltration Basin Supplement
Bioretention Area Supplements
Project No.: 4017
f"10 V Q 12006
D - Q-WAR®
Date
Comments:
Mr. Moore:
Pursuant to our conversation on October 30, 2006, we are enclosing the
infiltration basin supplement and the bioretention supplements'with associative
calculations. If you have any comments or questions pertaining to this
information, please do not hesitate to contact me.
Sincerely,
Bissell Professional Group
David M. Ry, ,
Project Engineer
P.O. Box 1068 + 3512 N. Croatan Hwy. ■ Kitty Hawk, NC 27949
252-261-3266■ Fax:[phone] E-mail:[e-mail]

Permit No.
to be provi e y
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
INFILTRATION BASIN SUPPLEMENT
This form maybe photocopied for use as an original
DWO Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a stormwater management permit application, an
infiltration basin supplement for each system, design calculations, soils report and plans and specifications
showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name : Manteo Middle School
Contact Person: Mr. Mark Bissell, P.E. Phone Number: 1(252) 261-3266
This worksheet applies to: Basin No. Inf-Basin#: 1 in Drainage Area 8
(as identified on plans) (from Form SWU-101)
II. DESIGN INFORMATION Attach supporting calculations/documentation. The soils report must be
based upon an actual field investigation and soil borings. County soil maps are not an acceptable source
of soils information. All elevations shall be in feet mean sea level (frnsl).
Soils Report Summary
Soil Type Baymeade Fine Sand
Infiltration Rate 6.0-20.0 in/hr or ef/hr/sf (circle appropriate units)
SHWT Elevation 7.0" fmsl (Seasonal High Water Table elevation)
Basin Design Parameters
Design Storm 1.0
Design Volume
Drawdown Time
3422
inch (1.5 inch event for Sit waters, I inch event for others)
c-f
6.0 hrs
Basin Dimensions (irregular geometry see attached plan)
Basin Size ft. x ft. = sq. ft. (bottom dimensions)
Basin Volume Provided 33729 c.f
Basin Elevations
Bottom Elevation 9.5 fmsl
Storage Elevation 12.0 finsl R" IEC IE 1�` IE©
Top Elevation 12.0 fmsl +�
1 , 0 12006
Page 1 of 3
A
Form S W U-103 Rev.3.99

III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Mane
(N.C. Department of Environment, Health and Natural _Resources, February 1999) and Administrative Co,
Section: 15 A NCAC 2H .1008.
Initial in. the space provided to indicate that the- following design requirements have been met and supportii
documentation is attached. If the applicant has designated an agent in the Stormwater Management Perm
Application Form, the agent may initial below. Attach justification if a requirement has not been met.
itials
a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
b. System is located at least 100 feet from water supply wells.
c. Bottom of system is at least 2 feet above the -seasonal high• water table.
d. Bottom of the system -is 3 feet above any bedrock or impervious soil horizon.
e. System is not sited on or in fill material or DWQ approval has been obtained.
f.
System is located in a recorded drainage easement for the purposes. of; operation and
maintenance and has recorded access easements to the nearest public right-of-way-
Drainage area -for the device is less than 5 acres.
Soils- leave a minimum hydraulic conductivity..of 0.52 inches per hour and soils report is
attached.
System captures and infiltrates the runoff from the first 2 .U"".Much o ainfall (1 S i "ch event
fnrareas-draining to:SAwatert ). -Design'volume and infiltratibh calc� �tions a#tached.
System is sized to take into account the runoff at the ultimate built-out.potentiai from all
surfaces draining to the system, including any off -site drainage_ Caleulations,attaehed:
k. All side slopes stabilized with- vegetated cover are. no -steeper than 3:1 (H: V).
1. A pretreatment device such as a catch bgsip, grease trap,. filter strip, grassed swale or
sediment trap is provided.
in. Bottom of the device is covered with a layer of clean sand to a.Q:avexage=depth:of 4 inches
or dense vegetative cover is provided.
-9t'►�`+ Qrr'� n:
Vegetated filter is provided for overflow and detail.is shown on.plans (Required minimum
pmsY. tom. To r► Ir
-V ILcjtq.�
length is 50 feet for SA waters, 30 feet for other waters).
6-c%4& 13wu
! mot i2O?'V:r
Flow. distribution mechanism within the basin.is provided-
ppLyL40 0,4 r Pff.
A benchmark is provided to determine the sediment accumulation in the pretreatment .
device.
Nov av�rt�io�✓ ,
- , JA*.Q 7 q.
Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
r.
System is designed to draw down the design storage volume to the proposed bottom
elevation under seasonal high water conditions within five days. A soils report and all
pertinent draw -down calculations are attached.
A&OV�S.
Plans ensure that the installed system will meet design specifications (constructed or
restored) upon initial operation once.the project is coihplete and the entire drainage area is
stabilized.
Form SWU-l03 Rev 3:99 Page 2 of 3

IV. INFILTRATION BASIN OPERATION AND MAINTENANCE AGREEMENT
1. After every runoff producing rainfall event and at least monthly inspect the infiltration system for erosion,
trash accumulation, vegetative cover, and general condition.
2. Repair eroded areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow
vegetated cover to maintain a maximum height of six inches, and remove trash as needed.
3. After every runoff producing rainfall event and at least monthly inspect the bypass, inflow and overflow
structures for blockage and deterioration. Remove any blockage and repair the structure to approved
design specifications.
4. Remove accumulated sediment from the pretreatment system and infiltration basin annually or when
depth in the pretreatment unit is reduced to 75% of the original design depth. The system shall be restored
to the original design depth without over -excavating. Over -excavating may cause the required water
table separation to be reduced and may compromise the ability of the system to perform as designed.
Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a manner
that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
A benchmark shall be established in the pretreatment unit_ The benchmark will document the original
design depth so that accurate sediment accumulation readings can be taken. The measuring device used
to determine the depth at the benchmark shall be such that it will give an accurate depth reading and not
readily penetrate into accumulated sediments.
When the design depth reads 10.12 S "feet in the pretreatment unit, the sediment shall be
removed from both the pretreatment unit and the infiltration basin.
5. If the Division determines that the system is failing, the system will immediately be repaired to original
design specifications. If the system cannot be repaired to perform its design function, other stormwater
control devices as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the perfonuatjce of the five
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 and Title: ,G-+� ..�'�. if ix rr Cc✓r,,>
Address: q0 -AA„ 1d o V, -77cl S y _ -
Phone: 75 `f -7 3 363 S _ Date: Z 7-3 -U G
Signature:
Note: The legally responsible party shoufd m ge 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 Pub is for the State of �rtu L-1�11ounty of
do hereby certify thatpersonally appeared before nee this
day ofand acknowledge the due execution of the forgoing infiltration basin maintenance
requirements. Witness my hand and official seal,
SE '`' " OFFICIA€_ SEAL "
i�'�I Notary Pubtir,. ;�nrtr, Carolina
County of D u
G'om:, is s nn hpr(.s 4MO/2010
Fo 5 -.
My commission expires
Page 3 of 3

Drainage Basin #8 `NFI LTR01U A�1T1
2/22/2006
Stormwater Management Calculations
Design Storm Event 1.0 in. rainfall event
Stormwater Management 15A NCAC 2H.1005 3(h)
Total Drainage Area
On -site Drainage Area 2.34 ac.
Off -Site Drainage Area 0 ac.
Total Drainage Area 2.34 ac.
Soils Report Data
Soil Type* Baymeade Fine sand
Infiltration Rate" (IR) 6.0 in/hr.
Apparent Water Table Elev.' 54 in.
*Taken from the Soil Survey Manua4 U. S. Dept. of Agriculture
**Data taken from On -Site Field Investigation
Total # of Drainage Basins
Drainage Basin Area #8 101,872 s.f.
Drainage Basin #3
Description
Area
(FT z)
Factor
D
Adj.Impervious
Area (FT')
Asphalt Parking & Drive
36,050
1.00
36,050
Conc. Sidewalk
3,920
1.00
3,920
Impervious Coverage Total 39,970
Adjusted Impervious Coverage Total
Total Basin Area (ft Z)
Calculated Impervious Coverage
Percent Impervious(I)
Rv = .05+ .009(I)
Required Pond Volume (ft3) = (1"112")xR,,xDA Ix43,560
Proposed Pond Storage Depth
Surface Area Provided @ Pond Bottom (SA
Surface Area Provided @ Storage Elevation (SA sro,",,)
Existing Ground Elevation
Proposed Basin Bottom Elevation (TP,, ,,)
Proposed Storage Elevation (S,,,„)
Total Storage Volume Provided (S1/)
Storage Volume Provided > Storage Volume Req'd
Ratio of storage volume provided to storage volume required
Drawdown Calculations
Qd.,,,down = (SV/SAb,,.)/1R
Total Storage Volume Provided
Proposed Basin Bottom Surface Area (SA
Soil Infiltration Rate 6.00 in/hr
Drawdown Period
Drawdown Period
Drawdown Period is < 5 days
O.K.
39,970
101,872
39,970
39
0.40
3,422
2.5
11,616
15,367
11.5
9.50
12.00
33,729
OX
9.86
0.83
0.09
0.92
0.92
2-34
0.92
ft3
ft.
112
ft2
ft. msl
ft. msl
ft. msl
ft3
33,729 ft3
11,616 ft2
0.50 ft3/hr/ft2
5.83 hrs
0.24 days
ac.
ac.
ac.
ac.
ac.
ac.

uwweturtr;u r"ax Hpr 16 "b 14:4y el U1
Permit No. OQ &62B i 4-
(to be provided by D1VQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORM�ti'ATER I4LA�1AGENIENI T PERMIT APPLICATION FORM
BIORETENTION AREA SUPPLEMENT
DWO Stormwater ManaMment Plan Review:
A complete stormwater management plan submittal includes a stormwater management permit application, an
bioretention area supplement for each system, design calculations, soils report and plans and specifications showing all
stormwater conveyances acid system details.
I. PROJECT INFORMATION
Project Name : /1WJTG:-0 /" 1 0Di_E� _)CH00U
Contact Person: __ bAyft,, AN,_ __F__ _ Phone Number: ( az) 2 13Z6,42 10"
B10M !A
For projects with multiple basins, specify which basin this worksheet applies to: -IM ,
H. DESIGN INFORMATION -Attach supporting calculations/documentation. Provide a written soils report based
on actual field investigations conducted by a qualified individual, The soils report should include informational
references to the County soils maps when available. All elevations shall be in feet mean sea level (frnsl),
lils Report Summary
__-Situ Soil Type BAYMEADV t�-'"FZ';&1Ub
In -Situ Soil Infiltration Rate �2D,- ,inAir. (the most restrictive sail layer)
SHWT Elevation -0' ft. .(.Seasonal High Water Table elevation)
Planting Soil Texture SA1-i i -WAM (must be a sandy lwm, loamy sand, or loam texture) i
Planting Soil Infiltration Rate L•G in./hr. (estimated)
Basin Design Parameters
Drainage Area
Impervious Area
Design Storm
Design volumc
Inlet 'Velocity
Inlet flow depth
Drawdown Time
Basin Dimensions
Basin Si}.e
Basin Volume Provided
Basin Elevations
Temporary Pool Elevation
Planting Elevation
Bottoms Elevation
1461,766 sq,fl. (on -site and off -site drainage to the basin)
7 " sq-ft. (on -site and off -site drainage to the basin)
1.6 ^ inch (1.5 inch event for SA waters, ) inch event for others)
C.f. (storage voleune require
O fps
N. A inch
days
Sae
� ft. x J=t. = sq. ft. (turfoce area at basin bottom)
_bc,f.
1 t " 1%tdr rmsi (elevation of the bypass%outlet su mature}
1 i- 25t find (elevation of. he ground surface botrom)
i l . b0' fmsl (elevation of the bottom of the planting media)
Page I of 3

LJWU/L&-ICI Fax:��
III. REQUIRED ITEMS CHECKLIST
Wpr 18 06_ 14:50 P. 03
Initial it the space provided to indicate that the following design requirements have 1�een met and supporting
:=nentation is attached. If requtrettwnt has not been met, attach are explanation of why. An incomplete submittal
package will result in a request for additional information and will substantially delay final review and approval of the
project.
Applicants Initials
Dmiz a. No vertical sand bed is proposed.
DM 0 b. The bioreterltion area is at least 40 feet by l 5 feet.
DM iZ C. Sheet flaw is provided at inlet.
M 1Z el. A grass buffer strip is provided at the inlet of the bioretention area.
bid 2 e. Seasonal High Water table depth is at least 2 feet from bottom of planting media.
�)� f. Ponding depth of 5-9" is provided. PO4A Jb tN& E= PrH G !o l ff AS _f� 0 FbrU , 6A61A 3
bizrA4GC
61�f fZ g. The in -situ soil infiltration rate is greater than 0.52 in/fir. 1kMr, A
� .... _. h. The planting soil infiltration rate is greater than 0.52 in/hr. E P.AX I N60j +A1
AA 1Z i. The ponded area will draw down in less than 5,days. (calculations attached)
Planting soil meets minimum soil specilinati.oas (NCDENR Stormwater.Best CAJATWJv 7 �i L5 't^z>
Management Practices Manual, April 1999) 6I~ LJ71 t.1 ZEb J
bk. A planting schedule with species and densities is provided on plans -
I. Mulch layer and depth is specified on plates.
bA4 M m. Plan details for the bioretention area are provided. ( including dimensions and elevations)
%,JA n. Plan details for the inlet and outlet are provided. M
7 1 „ G2' p7alZ�r(
b� o. An operation and maintenance agreement signed and notarized by the responsible parry is provided.''p�
This system (cheek one) © does 9 does not incorporate the use of an under -drain.
IV_ WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Maintenance activities shall be performed as follows:
I. Inspect the bioretention area system for soil and mulch erosion, vegetated cover; and general condition after every
significant runoff produoinp rainfall event and at least monthly. Remove trash as needed.
2. Repair eroded areas immediarely, re -seed and rc-mulch as Itecessary to maintain good vebatative and mulch cover.
}�.cmove accux'nulutcd scclimcnt snd old mulch nccded to mQ'trAtaizi goad i�efil?rstion. Rc�laocr or add additional
mulch as needed. Removal of the old mulch layer before applying the new layer is recommended avcry 2 to 3 years.
pag0 2 of 4

..
LA / WHKU r d>; L` L—yob—yL15 Hpr 1 S ' Ub ld : SU P. 04
4, Prune trees and shrubs and remavc debris on an annual basis. Grassed vegetation should not exceed 6 inches in height.
S. Treat all diseased trees and shrubs whenever needed. Remove and replace all dead and diseased vegetation considered
beyond treatment every 6 months,
6. Replace support stakes yearly (in the Spring). Replace deficient stakes or wires whenever needed.
7. Soil testing shall be conducted annually to determine pH and any accumulation or toxins in the planting media. Lime
or other alkaline substances shall be applied as recommended per the soil test and toxic sails shall be removed,
disposed of properly and replaced with new planting media.
8. All components of the bioretention area system shall be maintained in good working order.
I acknowledge and agree by my signature below that 1 ant responsible for the performance of the eight maintenance
procedures listed above. 1 agree to notify DVvQ of any problems with the system or prior to any changes to the system or
responsible party.
Print name: —Ferr tJ �r e t r�►1r S
Title:
Address-
Phone:
Signature:
Date- //
Note: The legally responstble party Should not be a homeowners association unless more than 50 of the lilts have bccn sold and a resident of the
subdivision has bccn named the president.
I, kL-&'.eL, �C.Vr1z"67te'(47- a Notary Public for the statti of Nar��
unty of : . do hereby certify that t'-I�rwj_lldc Cn'�1.fi 5 _
personally appeared before me this day of CQg (yb t, i-I , and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official seal.
OFFICIAL SEAL.
Not" Public. North C trolina
County of Barg
DEBRA W. GWALTNEY
My Commftlon Expires May 3R, 2010
SEAL
My commission expires Ct G' 3, AO I C'
Page. 3 of 3

Drainage Basin #3 =7 Be,IzF-TEIV i ot/j 8Ac5w ;F • •��
Stormwater Management Calculations
Design Storm Event 1.0 in. rainfall event
Stonnivater Management 15ANCAC?H.10053(b)
Total Drainage Area
On -site Drainage Area 3.37 ac.
Off -Site Drainage Area 0 ac.
Total Drainage Area 3.37 ac.
Soils Report Data
Soil Type* Baymeade Fine sand
Infiltration Rate* (IR) 6.0 in/hr.
Apparent Water Table Elev.** 48 in.
*Taken from the Soil Survey Manual, U.S. Dept. of Agriculture
**Data taken from On -Site Field Investigation
Drainage Basin #3
146,788 s.f.
146,788 s.f
Description
Area
(FT `)
Factor
©
Adj. Impervious
Area (FT')
Asphalt Parking & Drives
36,582
1.00
36,582
Conc. Sidewalk
10,034
1.00
10,034
10' Asphalt Emergency Access Drive
428
1.00
428
18' Gravel Access Road
2,532
1.00
2,532
Landscaping Stone
2,855
1.00
2,855
Building
18,897
1.00
18,897
Impervious Coverage Ibtat 11,szts
Adjusted Impervious Coverage Total
71,328
Total Basin Area (ft 3 )
146,788
Calculated Impervious Coverage
71,328
Percent Impervious(1)
49
Rv = .05+ .009(I)
0.49
Required Pond Volume (ft3) = (I "112")xR , xDA t x43, 560
5,961
Surface Area Provided @ Pond 1 Bottom (SA b,,,,,,)
, 14,514
Surface Area Provided @ Pond 1 Storage Elevation (SA S,, xj
20,778
Proposed Basin 1 Bottom Elevation (TPere1)
11.5
Proposed Basin I Storage Elevation (S el,)
13.0
Storage Volume of Basin I Provided (SV)
26,469
Surface Area Provided @ Pond IA Bottom (SA to�to,,,)
- 5,145
Surface Area Provided @ Pond IA Storage Elevation (SA framge)
9,000 .
Existing Basin 1A Bottom Elevation (TPetev)
11.00
Proposed Basin Bottom Elevation (PB erev) *
11.25
Ultimate IA Storage Elevation (S ere1,)
13.00
Storage Volume of Basin IA Provided (SV)
12,377
Total Storage Volume Provided (SV)
38,846
Temporary Storage Elevation (T erev )
11.77
Storage Volume Provided >Storage Volume Req'd
O.K.
Ratio of storage volume provided to storage volume required
6.52
0.84 ac.
0.23 ac.
0.01 ac.
0.06 ac.
0.07 ac.
0.43 ac.
1.64 ac.
1.64 ac.
3.37 ac.
1.64 ac.
ft3
ft2
ft2
ft
ft
113
ft2
ft2
ft. rnsl
ft. rnsl
ft. rnsl
ft3
ft3
ft. rnsl
10/17/2006

Drainage Basin #3
Drawdown Calculations Basin #1A
Qdrawdown (SV/SAb.,..)/1R
Total Storage Volume Provider!
12,377 ft'`
Total Basin Bottom Surface Area (SA aorto,,,)
5,145 ft'
In -Situ Soil Basin Bottom Surface Area (SA bo,to„i)
4,895 ft'
Soil Infiltration Rate 6.00 in/hr
0.50 ft3lhrlftz
Potting Soil Basin Bottom Surface Area (SA bo,,,,,,)
25 ft2
Factor of Safety Applied
10
Calculated Potting Soil Basin Bottom Surface Area (SA bo„om)
250 ftz
Estimated Soil Infiltration Rate 0.52 inlhr
0.0432 ft3lhr/ft3
Anticipated Drawdown Period
60.57 hrs
Drawdown Period
2.52 days
Drawdown Perod is c 5 days O.K.
Based upon the addition of a 3" deep mulch layer proposed along the entirety of the basin boi
Ftom
10/17/2006

Permit No.
to be provide y
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
fjlb - VMT—iF-i%-J16AJ BASIN SUPPLEMENT
This form may be photocopied for use as an original
DWO Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a stormwater management permit application, an
infiltration basin supplement for each system, design calculations, soils report and plans and specifications
showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name : Manteo Middle School
Contact Person: Mr. Mark Bissell, P.E. Phone Number: 1(252) 261-3266
This worksheet applies to: Basin No. Bio-Ret # 2 in Drainage Area
(as identified on plans)
5
(from Form SWU-101)
II. DESIGN INFORMATION Attach supporting calculations/documentation. The soils report must be
based upon an actual field investigation and soil borings. County soil maps are not an acceptable source
of soils information. All elevations shall be in feet mean sea level (fmsl).
Soils Report Summary
Soil Type Icaria loamy fine sand
Infiltration Rate 0.6-2.0 in/hr or cf/hr/sf (circle appropriate units)
SHVY T Elevation 8.0' fmsl (Seasonal High Water Table elevation)
Basin Design Parameters
Design Storm 1.0
Design Volume 4324
inch (1.5 inch event for SA waters, I inch event for others)
c. f.
Drawdown Time 11.0 hrs
Basin Dimensions
Basin Size
Basin Volume Provided
Basin Elevations
Bottom Elevation
Storage Elevation
Top Elevation
ft. x
23234 c.f
(irregular geometry see attached plan)
ft. = sq. ft. (bottom dimensions)
10.5 finsl RECENE®
12.0 fmsl
12.0 fmsl 1 Z006
DWQ-WARO
Page l of 3
Form S W U-103 Rev.3. 99

III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Manua
(N.C. Department of Environment, Health and Natural Resources, February 109) and Administrative Coe
Section: 15 A NCAC 2H .1008.
hiiU in. the space provided to indicate that. the- following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below. Attach justification if a requirement has not been met.
FWVJM7&ZaA
IrWRIA
11
tials
a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
b. System is located at least I GO- feet from water supply wells.
c. Bottom of system is at least 2 feet above the -seasonal. high, -water table.
d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon.
e. System is not -sited on or in All material or DWQ approval has been obtained.
f.
System is located in a recorded drainage easement for the purposes. of;operation and
maintenance and has recorded access easements to the nearest public right-of-way.
Drainage area,for the device is less than 5 acres.
Soils have a minimum hydraulic conductivity. of 0.52 inches per hour and soils report is
attached.
System captures and infiltrates the runoff from the first 1.0"iach.'ot iaiiifall (13 inch event
for-,areasdraining to SA'waters ). DesigwVblume: and infiltration dffl ' ons attached.
System is sized to take into account the runoff at the ultimate built-out.potentUd from all
surfaces draining to the system, including any off -site drainage. Calculations -attached:
k. All side slopes stabilized with vegetated cover. are no steeper than 3:1 (H:V).
1. A pretreatment device such as a catch basin, grease trap, filter strip, grassed Swale or
sediment lisp is provided.
m. Bottom of the device is covered with a layer of clean sand to an.average -depth: of 4 inches
or dense vegetative cover is provided.
&-4rTj%6`-aCV" n. Vegetated filter is provided for overflow and detail -is shown on plans (Required minimum
bzary t t- To r� length is 50 feet for SA waters, 30 feet for other waters). .
6-r%4,v- 111VUy %oe�
,,wowcad,k OX�_ r Flow. distribution mechanism within the basin. is provided.
/Inwt ft CWT11f. A benchmark is provided to determine the. -sediment accumulation in the pretreatment .
device.
Ah� o�c?rZ�coc✓ .
- ec-ur p q. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
r. System is designed to draw down the design storage volume to the proposed bottom
elevation under seasonal high water conditions within five days. A soils report and all
pertinent draw -down calculations are attached.
s. Plans ensure that the installed system will meet design specifications (constructed or
restored) upon initial operation once.the project is complete and the entire drainage area is
stabilized.
Form SWU-103 Rev 3.99 Page 2 of 3

W. INFILTRATION BASIN OPERATION AND MAINTENANCE AGREEMENT
A 1. After every runoff producing rainfall event and at least monthly inspect the infiltration system for erosion,
trash accumulation, vegetative cover, and general condition.
2. Repair eroded areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow
vegetated cover to maintain a maximum height of six inches, and remove trash as needed_
3. After every runoff producing rainfall event and at least monthly inspect the bypass, inflow and overflow
structures for blockage and deterioration. Remove any blockage and repair the structure to approved
design specifications.
4. Remove accumulated sediment from the pretreatment system and infiltration basin annually or when
depth in the pretreatment unit is reduced to 75% of the original design depth.. The system shall be restored
to the original design depth without over -excavating. Over -excavating may cause the required water
table separation to be reduced and may compromise the ability of the system to perform as designed.
Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a manner
that will adversely impact water quality (Le. stockpiling near a stormwater treatment device or stream,
etc.).
A benchmark shall be established in the pretreatment unit. The benchmark will document the original
design depth so that accurate sediment accumulation readings can be taken. The measuring device used
to determine the depth at the benchmark shall be such that it will give an accurate depth reading and not
readily penetrate into accumulated sediments.
i
When the design depth reads la • 87S •feet in the pretreatment unit, the sediment shall be
removed from both the pretreatment unit and the infiltration basin.
5. If the Division determines that the system is failing, the system will immediately be repaired to original
design specifications. If the' system cannot be repaired to perform its design function, other stormwater
control devices as allowed by NCAC 2H .l 004 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performagce of the five
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 and Title: MAkI . S iZ . Wl,y��lZG, IFYIf 7hZ k1&27_ f
Address:, D.4:2. GQ\C 6-Yv _ A4A016, a
Phone: Z• `17 i,-- 3 r, 35 Date: --2- 2"5- o G
Signature:
Note: The legally responsible parry Wnot 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, L1-c"e LLI-�bLelj a Notary Public for the State of 'l ��zGc, County of
k� do hereby certify that I Q"(A �-� +-r�L��2 personally appeared before me this
day of ' �', and acknowledge the due execution of the forgoing infiltration basin maintenance T
requirements. Witness my hand and official seal,]] 1
�•�,*� " OFFICIAL SEAL" L'� 1
SE , ;s Notary Puhiic North Carolina My commission expires
of pare
W- Warren
`" An Com'-swonEx jres4/10/2010
Form Page 3 of 3

Drainage Basin #5 �j IdR 151 r" IdN jAE',Ill? #G-.
2/22/2006
Stormwater Management Calculations
Design Storm Event 1.0 in. rainfall event
Stormwater Management 15A NCAC 2H.1005 3(b)
Total Drainage Area
On -site Drainage Area 3.01 ac.
Off -Site Drainage Area 0 ac.
Total Drainage Area 3.01 ac.
Soils Report Data
Soil Type" Icaria Loamy Fine Sand
Infiltration Rate" (IR) 2.0 in/hr.
Apparent Water Table Elev.' 36 in.
*Taken from the Soil Survey Manua4 U. S_ Dept. of Agriculture
**Data taken from On -Site Field Investigation
Total # of Drainage Basins
Drainage Basin Area #5 182,477 s.f.
Drainaee Basin #5
Description
Area
(FT 2)
Factor
©
Adj. Impervious
Area (FT 2 )
Conc. Sidewalk
5,536
1.00
5,536
Landscaping Stone
4,461
1.00
4,461
Building
37,524
1.00
37,524
Impervious Coverage Total 47,521
Adjusted Impervious Coverage Total
Total Basin Area (ft 2 )
Calculated Impervious Coverage
Percent Impervious(I)
Rv = .05 + .009(I)
Required Pond Volume (ft3) = (1 "/12°)xR „xDA Ix43,560
Proposed Pond Storage Depth
Surface Area Provided @ Pond Bottom (SA
Surface Area Provided @ Storage Elevation (SA ,,amge )
Existing Ground Elevation
Proposed Basin Bottom Elevation (TPeuv)
Proposed Storage Elevation (S elev }
Total Storage Volume Provided (S /)
StorageVolume Provided>Storage Volume Req'd
Ratio of storage volume provided to storage volume required
Drawdown Calculations
Qdrawduwn = (SV/SAbopom)/1R
Total Storage Volume Provided
Proposed Basin Bottom Surface Area (SA aanam )
Soil Infiltration Rate 2.00 in/hr
Drawdown Period
Drawdown Period
Drawdown Period is < 5 days
M
47,521
182,477
47,521
26
0.28
4,324
1.5
12,818
18,160
11
10.50
12.00
23,234
O.K.
5.37
0.13
0.10
0.86
1.09
1.09
4.19
1.09
ft3
ft.
ft2
ft2
ft. rnsl
ft. msl
ft. rnsl
ft3
23,234 ft3
12,818 ft2
0.17 ft3/hr/ft2
10.92 hrs
0.45 days
ac.
ac.
ac.
ac.
ac.
ac.
ac.

r'k
-A VLOW1 iairlru t 6x : Hpf 1.2 'Uri 14 : 4`J F . U2
Fermit No. Sa7o3a� 4
!tc be provided by Dt6'Q)
State of North Carolina.
Department of Environment and Natural Resources
Division of Water (duality
STOni-WATER NIANACENII NT PERMI-C APPLICATION, FORM
BIORETENTION AREA SUPPLEMEW
DWQ Storcnwater Management Plan Review &
A complete stormwater management plan submittal includes a storrnwater management permit application, an
bioretention area supplement for each system, design calculations, soils report and plans and specifications showing all
stormwater conveyances and system details.
1, PROJECT INFORMATION
Project Name :
Contact Person!
Phone Number_
For projects with multiple basins, specify which basin this worksheet applies to: ✓�57N f
11. DESIGN INFORMATION -Attach supporting calculations/documentation. Provide a written soils report based
on actual field investigations conducted by a qualified individual. The soils report should include informational
references to the County soils maps when available. All elevations shall be in feet mean sea level (fmsl),
As Report Summary
-Situ Soil Type BAytm Abt rl-i5 3/.,,uD
In -Situ Soil Infiltration Rate 4,0-20.0 inJhr. (the most restrictive soil layer)
5HW x Elevation a .0 ._ ft. (Seasonal High 6irater Table elevation)
Planting soil Texture C�4WW LOAM (must be a sandy loam, loarnv sand, or loam texture)
Planting Soil Infiltration Rate . 4&c- _ im/hr. (estimated)
Basin Design Parameters
�3,L�-y t
Drainage Area
sq.ft. (on -site and off -site drainage to the basin)
Impervious Area
7 j
sq.ft. (an -site and off -sire drainage to the basin)
Design Storm
i .p
inch (1,5 inch event for Sal waters, 1 inch event for others)
Design Volume
—�cY'
o-f. (aroragc �01a required}
Inlet Velocity
fps
Inlet flow depth
NIA
inch
Drawdown Time
: TZ _
days
Basin Dimensions
S A- rAC-PEb- F"-4a-3 �vr? �c i='rU"
Basin Size
_
fC. X ft. sq. ft- (surface area al basin bottom)
aSSlm Volume 1'iot'!dL'[l
J4 3-7J2_
c.f
Basin Elevations
Temporary Pool Elevation
Planting Elevation
Bottom Elevation
�) finsl (elevation of rf:e bupass/oudet structure)
i0, 75 ' find (elmuriarz of the ground surface bottom)
iD. 50r fmsl (elevation of the borwn, of the planting media)
Yaae I of 3
NOV 0 12006

1Ju#.�/ tJn- KU I- a;: f=i-�r' 1 S : 06 1 �l = 50 P. 0
III. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate that the following design requirements have been met and supporting
,;unlentation is attached. If a requirement has not been met, attach air explanation of why. An incomplete submittal
package will result in a request for additional information and will substantially delay final review and approval of the
project.
Applicants Initials
h1U 17 a- No vertical sand bed is proposed.
imp— b. The bioretention area is at least 40 feet by 15 feet.
DI" L c. Sheet flow is provided at inlet.
Der d. A grass buffer strip is provided at the inlet of the bioretention area, 62 w if>LO
WAIZ e. Seasonal High Water table depth is at least 2 feet from bottom of planting media.
f. Ponding depth of 6-9" is provided.
A-P-45A
I>AAP_ g. The in -situ soil infiltration rate is greater than 0.52 in/fir.
��% h.The planting soil infiltration rate is greater than 0.52 in/br. ctJArlJZ5 two ill r i � 17_iw b]
h i. The ponded area will draw down in less than 5 days. (calculations attached)
�J/A j. Planting soil meets minimum soil specifications (NCDI*.NR Stormwater $est FQATN-A)tL!5 WILL 5E
Management Practices Manual, April 1999) UT-+L3Z1~ 15J
k. A planting schedule with species and densities is provided on plans.
1. Mulch layer and depth is specified on plans.
m. Plait details for the bioretention area are provided. (including dimensions and elevations)
IU n. Plan details for the inlet and outlet are provided. LAY-:, r'7trc' ; b 0t3Ti.t 1 / iA3L T 86`�b �)'c
- ]pia) DE-_,.L_,Kj wj &,-r„ur-�, LVa'b �alzsi�L-i:
o. Art operation and maintenance agreement signed and notarized by the responsible parry is provided,Lt}s�tL�
This system (check one) Q does @floes not incorporate the use of an ender -drain.
IV. WET DETENTION BASIN OPERATION AND N7AINTENANCE AGREEMENT
Maintenance activities shall be performed as fellows:
1, Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after every
significant runoff producing rainfall event and at least monthly. Remove trash as needed.
1 kepair eroded areas immediately, re -seed and re -mulch as necessary to maintain good vegetative and mulch cover.
R.cmo-c nccvmuAxtcd ecdimcnr : d -1-1 m Jcl, :-�r needed to raainva;n sood infltration- .rZc�lat:�, or add additional
mulch as needed, Removal of the uld mulch layer before applying the nQw layer is recommended every 2 to ; years.
pa-e 7 of

uwUf WHKU rax [� D Hpr 1� ' Ub 1.zi ti0 P. FYI
4. Prune trees and shrubs and remove debiis on an annual basis. Grassed vegetatinn should not exceed 6 inches in Height.
5. Treat all diseased trees and shmbs whenever needed. Remove and replace all dead and diseased vegetation considered
beyond treatment every 6 months.
6. Replace support stakes yearly (in the Spring). Replace deficient stakes or wires whenever needed.
7_ Soil Testing shall be conducted annually to determine pM and any accumulation of toxins in the planting media. Lime
or other alkaline substances shall be applied as recommended per the soiI test and toxic soils shall be removed,
disposed of properly and replaced with new planting media.
8. All components of the bioretention area system shall be maintained in good working order.
I acknowledge and agree by my si ;nature below that I am responsible for the performance of the eight maintenance
procedures listed above. 1 agree to notify DWQ of any problems with the system or prior to any changes to the system Or
responsible parry.
Print
Title:
Addri
Phon+
3igtta
Date:
Note: The legally responetble parry Should not be a homeownixs association unless morn than 5M- of the lots have been sn! d and a resident of the
subdivision has been named the prrsldem
1, > Lt44' L-0- w's a Notary Public for the State of r+ 164'h ec1_'yiir' ,
unty of Ta.1j,_ , do hereby certify that . 'Te O—
personally appeared before me this day of Qt�oix r` 0 7n ., and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness m�yhand and official seal,
.. J
f . OFFICIAL SEAL
i N4�Sry North Caroli
4urlty of Dam
�
•.� DEBRA W, GWA NEY'
My Commission Exaims Mav Y 1, 2010
My commission expires AL-4
.'

Drainage Basin ##4 7 E cop_r__-T—,AjTic" 16ASt IJ � 3
Stormwater Management Calculations
Design Storm Event 1.0 in. rainfall event
Storrnwater A lanagement I5A AICAC 2H.1 DOS 3(h)
Total Drainage Area
Uri -site Drainage Area 1.91 ac.
Off -Site Drainage Area 0 ac.
Total Drainage Area 1.91 ac.
Soils Report Data
Soil Type' Baymeade Fine Sand
Infiltration Rate* (IR) 6.0 in/hr.
Apparent Water Table Elev,** 48 in.
*1 aken from the Soil Survey Manual, U.S. Dept. of Apiculture
**Data taken from On -Site Field Investigation
Drainage Basin #4
83,291
83,291
Description
Area
(FT")
Factor
©
Adj.Imperviotu
Area (FT Z)
Asphalt Bus Loop
1 B,424
1,00
18,424
Conc. Sidewalk
9,381
1,00
9,381
Landscaping Stone
2,549
1.00
1 2,549
Building
3,522
1.00
1 3:522
Impervious Coverage Total 33,876
Adjusted Impervious Coverage Total
33,876
Total Basin Area (ft z)
83,291
Calculated Impervious Coverage
33,876
Percent Impervious(1)
41
Rv = .05+ .009(1)
0.42
Required Pond Volume (ff3) = (7"/12")xR,xDAIx43.,560
2,888
Proposed Pond Storage Depth
1.7`
Surface Area Provided r ; Pond Bottom (SA ��om }
6,599
Surf ace Area Provided @ Ultimate Storage Elevation (SA s,a,,�)
20,116
Existing Basin Bottom Elevation (ER,[)
rasa
Proposed Basin Bottom Elevation (1'B,t,v)n
10.75
Ultimate Storage Elevation (S ,,:.)
t2,50
Temporary Storage Elevation (TP et,;.)
11.0
Total Storage Voltone Provided (ST)
23,376
StorageVolurne. Provided>Storage Volume Req'd
O.K.
Ratio of storage volume provided to storage volume requited
8.09
Drawdown Calculations
10/17/2006
S.f.
S.f.
`5�111tiIP111JII
C A R
06
filly
0,42
0.22
0.06
0.08
0.78
0.78
1.91
0.78
yin
ft3
ft.
ft2
ft2
ft. msl
ft. msl'
ft. rnsl
ft, msl
ft3
Qd,.d.. = (SV/SAb....)/lR
{
Total Storage Volumre Provided
23,376 ft'-
Total Basin Bottom Surface Area (SA
6,599 ft2
In -Situ Soil Basin Bottom .Surface Area (SA L......)
6,168 ft2
Soil Infiltration Rate 6.00 in/hr
0.50 ft3/hr/ft2
Potting Soil Basin Bottom Surface Area (SA„I j
43 ftz
Factor of Safety Applied
10
Calculated Potting Soil Basin Bottom Surface Area (SA;U,,, }
431 ft2
Estimated Soillnfiltration Rate 0.52 in/hr
0.0432 f0/hr/ft3
Anticipated Drawdown Period
89.19 hrs
Drawdown Period
3.72 days
Drawdown Period is < .5 days U.K.
* Based upon the addition of a 3" deep mulch laver nroDosed along the entirety of the basin bo
ac.
ac_
ac.
ac,
ac.
ac.
ac.
ac.
ttom

• �pF W A rFgp Michael F. Easley, Governor " ""
�0 G William G. Ross Jr., Secretary
,T2 ' r North Carolina Department of Environment and Natural Resources
>
Alan W. Klimek, P.E. Director
Division of Water Quality
DIVISION OF WATER QUALITY
June 16, 2006
Dare County Board of Education
Attn: Mr. Jim Winebarger
PO Box 640
Manteo, NC 27954
Subject:
Dear Mr. Winebarger:
MODIFICATION FOR
Stormwater Permit No. SW7030814
Manteo Middle School
High Density Stormwater Project
Dare County
The Washington Regional Office received your request for a
permit modification for the subject project on March 10, 2006.
Staff review of the plans and specifications has determined that
the project, as proposed, will comply with the Stormwater
Regulations set forth in Title 15A NCAC 2H.1000. We are
forwarding Permit No. SW7030814 dated June 16, 2006 to Dare County
Board of Education.
This modification replaces the previous permit and shall be
effective from the date of issuance until June 16, 2016 and shall
be subject to the conditions and limitations as specified therein.
Please pay special attention to the Operation and Maintenance
requirements in this permit. Failure to establish an adequate
system for operation and maintenance of the stormwater management
system will result in future compliance problems.
If any parts, requirements, or limitations contained in this
permit are unacceptable, you have the right to request an
adjudi.catory hearing upon written request within thirty (30) days
following receipt of this permit. This request must be in the
form of a written petition, conforming to Chapter 150B of the
North Carolina General Statutes, and filed with the Office of
Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-
7447. Unless such demands are made this permit shall be final and
binding.
North Carolina Division of Water Quality Internet: www.newaterqualitv.ora 1��One
943 Washington Square Mall Phone [phone] NQ Carolina
Washington, NC 27889 Fax [phone] Murray,
An Equal Opportunity/Affirmative Action Empbyer— 50% Recycletill0% Post Consumer Paper

Bare County Board of Education
June 16, 2006
Page Two
If you have any questions, or need additional information
concerning this matter, please contact Mr. Bill Moore at (252)948-
3919.
S' cerel
Al Hodge,�egionll—SU­pervisor
Surface Water Protection Section
Washington Regional Office
cc: Bissell Professional Group
are County Planning/Inspections
✓WIARO Stormwater Files
Central Files

M
State Stormwater Management Systems
Permit No. SW7030814
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143,
General Statutes of North Carolina as amended, and other
applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
Dare County Board of Education
Dare County
FOR THE
construction, operation and maintenance of stormwater management
systems in compliance with the provisions of 15A NCAC 2H.1000
(hereafter referred to as the "stormwater rules") and the approved
stormwater management plans and specifications and other
supporting data as attached and on file with and approved by the
Division of Water Quality and considered a part of this permit for
vegetated swales and buffers, and (5) infiltration basins, to
serve Manteo Middle School located off US64 at Manteo, NC.
This modification replaces the previous permit, and shall be
effective from the date of issuance until June 16, 2016, and shall
be subject to the following specified conditions and limitations:
I. DESIGN STANDARDS
1. This permit is effective only with respect to the nature and
volume of 'stormwater. described in the application and other
supporting data.
2. This stormwater system has been approved for the management
of stormwater runoff as described on page 4 of this. permit,
the Project Data Sheet.
3. Approved plans and specifications for this project are
incorporated by reference and are enforceable parts of the
permit.
3

DIVISION OF WATER QUALITY
PROJECT DATA
Project Name:
Permit Number:
Location:
Applicant:
Mailing Address:
Application Date:
Water Body Receiving Stormwater
Runoff:
Classification of Water Body:
Total Site Area:
Total Impervious
Surfaces Allowed:
Manteo Middle School
SW7030814
Dare County
Dare County Board of Education
PO Box 640
Manteo, NC 27954
3/10/2006; original
6/15/2006; complete
UT --Roanoke Sound
SA
34.08 acres
5.93 acres
Basin
Number
Required
Storage
Provided
Storage
Provided
Area
Storage
Elevations
Inf #1
2888
cf
26715
cf
6599
sf
12.5 ft
Inf #2
3422
cf
33729
cf
11616
sf
12.0 ft
Bio--Ret #
5961
cf
40614
cf
19659
sf
13.0 ft
1 and lA
Bio-Ret #2
4324
cf
23234
cf
12818
sf
12.0 ft
Note: Infiltration basins 1 & 2 are designed to function as dry
infiltration basins. Bio-Retention basins 1,1A & 2 are designed
with a plants, shrubs and small trees and will pond/infiltrate
stormwater in•excess of the required design storm.
N

4. No homeowner/lot owner/developer shall be allowed to fill in,
alter, or pipe any vegetative practices (such as swales)
shown on the approved plans as part of the stormwater
management system without submitting a revision to the permit
and receiving approvalfrom the Division.
5. The following items will require a modification to the
permit:
a. Any revision to the approved plans, regardless of size
b. Project name change
C. Transfer of ownership
d. Redesign or addition to the approved amount of built -
upon area
e. Further subdivision of the project area.
In addition, the Director may determine that other revisions
to the project should require a modification to the permit.
6. The Director may notify the permittee when the permitted site
does not meet one or more of the minimum requirements of the
permit. Within the time frame specified in the notice, the
permittee shall submit a written time schedule to the
Director for modifying the site to meet minimum requirements.
The permittee shall provide copies of revised plans and
certification in writing to the Director that the changes
have been made.
II. SCHEDULE OF COMPLIANCE
1. The permittee will comply with the following schedule for
construction and maintenance of the stormwater management
system.
a. The stormwater management system shall be -constructed
in its entirety, vegetated and operational for its
intended use prior to the construction of any built -
upon surfaces except roads.
b. During construction, erosion shall be kept to a minimum
and any eroded areas of the system will be repaired
immediately.
2. The facilities must be properly maintained and operated at
all times. The approved Operation and Maintenance Plan must
be followed in its entirety and maintenance must occur at the
scheduled intervals.
3. The permittee shall at all times provide the operation and
maintenance necessary to assure the permitted stormwater
system functions at optimum efficiency including, but not
limited to:
5

a. Semi-annual scheduled inspections (every 6 months)
b. Sediment removal
C. Mowing and revegetation of side slopes
d. Immediate repair of eroded areas
e. Maintenance of side slopes in accordance with approved
plans and specifications
f. Debris removal and unclogging of outlet structure,
orifice device and catch basins and piping.
4. Records of maintenance activities must be kept and made
available upon request to authorized personnel of DWQ. The
records will indicate the date, activity, name of person
performing the work and what actions were taken.
5. This permit shall become voidable unless the facilities are
constructed in accordance with the -conditions of this permit,
the approved plans and specifications, and other supporting
data.
6. Upon completion of construction and prior to operation of
this permitted facility, a certification must be received
from an appropriate designer for the system installed
certifying that the permitted facility has been installed in
accordance with this permit, the approved plans and
specifications, and other supporting documentation. Mail the
Certification to the Washington Regional Office, 943
Washington Square Mall, Washington, North Carolina, 27889,
attention Division of Water Quality.
7. A copy of the approved plans and specifications shall be
maintained on file by the Permittee for a minimum of five
years from the date of the completion of construction. .
III. GENERAL CONDITIONS
1. This permit is not transferable. In the event there is a
desire for the facilities to change ownership, or there is a
name change of the Permittee, a formal permit request must be
submitted to the Division of Water Quality accompanied by an
application fee, documentation from the parties involved, and
other supporting materials as may be appropriate. The
approval of this request will be considered on its merits and
may or may not be approved.
2. Failure to abide by the conditions and limitations contained
in this permit may subject the Permittee to enforcement
action by the Division of Water Quality, in accordance with
North Carolina General Statute 143-215.6(a) to 143-215.6(c).
3. The issuance of this permit does not preclude the Permittee
from complying with any -and all statutes, rules, regulations,
or ordinances which may be imposed by other government
agencies (local, state, and federal) which have jurisdiction.
6

4. In the event that the facilities fail to perform
satisfactorily, including the creation of nuisance
conditions, the Permittee shall take immediate corrective
action, including those as may be required by this Division,
such as the construction of additional or replacement
stormwater management systems.
5: The permit may be modified, revoked and reissued or
terminated for cause. The filing of a request for a permit
,modification, revocation and reissuance or termination does
not stay any permit condition.
6. At least 6 months prior to the expiration date, the permittee
must request that this permit be renewed.
Permit issued this the 16 th day of ,Tune, 2006.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
-
Alan W. Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number SW7030814
7

MODIFICATION FOR
Stormwater Permit SW7030814
(2) Dry Infiltration Basins, (3) Bio-Retention Basins and
Vegetated Swales
Manteo Middle School
Manteo, NC
Designer's Certification
I,
as a duly
registered Professional Engineer in the State of North Carolina,
having been authorized to observe (periodically/weekly/full time)
the construction of the project,
for
(Project)
(Project Owner)
hereby state that to the best of my abilities, due care and
diligence was used in the observation of the project construction
such that the construction was observed to be built within
substantial compliance and intent of the approved plans and
specifications.
Signature
Registration Number
Date
E%J

{ p�pF W A Lk9Q Michael F. Easley, Governor
� � William G. Ross Jr., Secretary
r North Carolina Department of Environment and Natural Resources
Q Alan W. Klimek, P.E. Director
Division of Water Quality
DIVISION OF WATER QUALITY
June 16, 2006 or r~
id
.r
Dare County Board of Education
Attn: Mr. Jim Winebarger
PO Box 640
Manteo, NC 27954
Subject: MODIFICATION FOR
Stormwater Permit No. SW7030814
Manteo Middle School
High Density Stormwater Project
Dare County
Dear Mr. Winebarger:
The Washington Regional Office received your request for a
permit modification for the subject project on March 10, 2006.
Staff review of the plans and specifications has determined that
the project, as proposed, will comply with the Stormwater
Regulations set forth in Title 15A NCAC 2H.1000. We are
forwarding Permit,No. SW7030814 dated June 16,-2006 to Dare County
Board of Education.
This modification replaces the previous permit and shall be
effective from the date of issuance until June 16, 2016 and shall
be subject to the conditions and limitations as specified therein.
Please pay special attention to the Operation and Maintenance
requirements in this permit. Failure to establish an adequate
system for operation and maintenance of the Stormwater management
system will result in future compliance problems.
If any.parts, requirements, or limitations contained in this
permit are unacceptable, you have the right to request an
adjudicatory hearing upon written request within thirty (30) days
following receipt of this permit. This request must be in the
form of a written petition, conforming to Chapter 150B of the
North Carolina General Statutes, and filed with the Office of
Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-
7447. Unless such demands are made this permit shall be final and
binding.
North Carolina Division of Water Quality Intemcc www.ncwaterqualitv.or; 1��One .,
943 Washington Square Mail Phone [phone]V O Caroi�na
Washington, NC 27889 Fax [phone] atura!!rf
An Equal OpportunitylAtfirmalive Acton Employer - 50% Recycled11 A Post Consumer Paper

Dare County Board of Education
June 16, 2006
Page Two
If you have any questions, or need additional information
concerning this matter, please contact Mr. Bill Moore at (252)948-
3919.
S' cerel ,
7
..................._. _A1.Hodge,d�e-al�pervisor
Surface Water Protection Section
Washington Regional Office
cc: ✓$issell Professional Group
.Dare.County Planning/Inspections
WARO 5tormwater Files
Central Files

State Stormwater Management Systems
Permit No. SW7030814
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21. of- Chapter 143,
General Statutes of North Carolina as amended, and other
applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
Dare County Board of Education
Dare County .
FOR THE
construction, operation and maintenance of stormwater management
systems in compliance with the provisions of 15A NCAC 2H.1000
(hereafter referred to as the "stormwater rules") and the approved
stormwater management ' plans and specifications and other
supporting data as attached and on file with and approved by the
Division of Water Quality and considered a part of this permit for
vegetated swales and buffers, and (5) infiltration basins, to
serge Manteo Middle School located off US64 at Manteo, NC.
This modification replaces the previous permit, and shall be
effective from the date of issuance until June 16, 2016, and shall
be subject to the following specified conditions and limitations:
I. DESIGN STANDARDS
1. This permit is effective only with respect to the nature and
volume of stormwater. described in the application and other
supporting data.
2. This stormwater system has been approved for the management
of stormwater runoff as described on page 4 of this. permit,
the Project Data Sheet.
3. Approved plans and specifications for this project are
incorporated by reference and are enforceable parts of the
hermit.
3

DIVISION OF WATER QUALITY
PROJECT DATA
Project Name:.
Permit Number:
Location:
Applicant:
Mailing Address:
Application Date:
Water Body Receiving Stormwater
Runoff:
Classification of Water Body:
Total. Site Area:
Total Impervious
Surfaces Allowed:
Manteo X-idd-lke School
SW710306114
Dare C---,anty
Dare County Board o= Zducation
PO Box 640
Manteo, NC 27954
3/10/2006; original
6/15/2006; complete
OT--Roanoke Sound
SA
34.08 acres
5.93 acres
Basin Required Provided Provided Storage
Number Storage Storage Area Elevations
Inf #1 2888 cf 26715 cf 6599 sf 12.5 ft
Inf #2 3422 cf 33729 cf 11616 sf 12.0 ft
Bio-Ret # 5961 cf 40614 cf 19659 sf 13.0 ft
1 and 1A
Bio-Ret 42 4324 cf 23234 cf 12818 sf 12.0 ft
Note: Infiltration basins 1 & 2 are designed to function as dry
infiltration basins. Bio-Retention basins 1,1A & 2 are designed
with a plants, shrubs and small trees and will pond/infiltrate
stormwater in excess of the required design storm.
4

4. No homeowner/lot owner/developer shall be allowed to fill in,
alter, or pipe any vegetative practices (such as swales)
shown on the approved plans as part of the stormwater
management system without submitting a revision to the permit
and receiving approval.from the Division.
5. The following items will require a modification to the
permit:
a. Any revision to.the approved plans, regardless of size
b. Project name change
C. Transfer of ownership
d. Redesign or addition to the approved amount of built -
upon area
e. Further -subdivision of the project area.
In addition, the Director may determine that other revisions
to the project should require a modification to the permit.
6. The Director may notify the permittee when the permitted site
does not meet one or more of the minimum requirements of the
permit. Within the time frame specified in the notice, the
permittee shall submit a written time schedule to the
Director for modifying the site to meet minimum requirements.
The permittee shall provide copies of revised plans and
certification in writing to the Director that the changes
have been made.
II. SCHEDULE OF COMPLIANCE
1. The permittee will comply with the following schedule for
construction and maintenance of the stormwater management
system.
a. The stormwater management system shall be constructed
in its entirety, vegetated and. operational for its
intended use prior to the construction of any built -
upon surfaces except roads.
b. During construction, erosion shall be kept to a minimum
and any eroded areas of the system will be repaired
immediately.
2. The facilities must be properly maintained and operated at
all times. The approved Operation and Maintenance Plan must
be followed in its entirety and maintenance must occur at the
scheduled intervals.
3. The permittee shall at -all times provide the operation and
maintenance necessary to assure the permitted stormwater
system functions at' optimum efficiency including, but not
limited to:
5

a. Semi-annual scheduled inspections (every 6 months)
b. Sediment removal
C. Mowing and revegetation of side slopes
d. Immediate repair of eroded areas
e. Maintenance of side slopes in accordance with approved
plans and specifications
f. Debris removal and unclogging of outlet structure,
orifice device and catch basins and piping.
4. Records of maintenance activities gust be kept and made
available upon request to authorized personnel of DWQ. The
records will indicate the date, activity, name of person_
performing the work and what actions were taken.
S. This permit shall become voidable unless the facilities are
constructed in accordance with the conditions of this permit,
the approved. plans and specifications, and other. supporting
data.
6. Upon completion of construction and prior to operation of
this permitted facility, a certification must be received
from an appropriate designer for tre system, instal -led
certifying that the permitted facility has been installed in
accordance with this permit, the approved plans and
specifications, and other supporting documentation. Nail the
Certification to the Washington Regional Office, 943
Washington Square Mall, Washington, ti-ort^ Carolina, 27889,
attention Division of Water Quality.
7. A copy of the approved plans and specifications shall be
maintained on file by the Permittee for a minimum of five
years from the date of the completion o= construction.
III. GENERAL CONDITIONS
1. This permit is not transferable. In the event there is a
desire for the facilities to change ownership, or there is a
name change of the Permittee, a formal permit request must be
submitted to the Division of Water Quality accompanied. by an
application fee, -.-documentation from..the-.parties involved, and
other supporting materials as may be appropriate. The
approval of this request will be considered on its merits and
may or may not be approved.
2. Failure to abide by the conditions and limitations contained
in this permit may subject the Permittee to, enforcement
action by the Division of Water Quality, in accordance with
North Carolina General Statute 143=215.6(a)to 143-215.6(c).
3. The issuance of this permit does not preclude the Permittee
from complying with any and all statutes, rules, regulations,
or ordinances which. may be imposed by other government
agencies (local, state, and federal) which have jurisdiction.
6

4. In the event that the facilities fail to perform
satisfactorily, including the creation of nuisance
conditions, the Permittee shall take immediate corrective
action, including those as may be required by this Division,
such as the construction of additional or replacement
stormwater management systems.
5.- The permit may be modified, revoked and reissued or
terminated for cause. The filing of a request for a permit
modification, revocation and reissuance or termination does
not stay any permit condition.
6. At least 6 months prior to the expiration date, the permittee
must request that this permit be renewed.
Permit issued this the 16 th day of June, 2006.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
� � r
Alan W. Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management
Permit Number SW7030814
7
Commission

MODIFICATION FOR
Stormwater Permit SW7030814
(2) Dry Infiltration Basins, (3) Bio-Retention Basins and
Vegetated Swales
Manteo Middle School
Manteo, NC
Designer's Certification
I,
as a duly
registered Professional Engineer. in the State of North Carolina,
having been authorized to observe (periodically/weekly/full time)
the construction of the project,
for
(Project)
(Project Owner)
hereby state that to the best of my abilities, due care and
diligence was used in the observation of the project construction
such that the construction was observed to be built within
substantial compliance and intent of the approved plans and
specifications.
Signature
Registration Number
Date

LT
IS
(rylod)
e_;G-F, n 9 4SWtioWgl�'
OFFICE USE ONLY
Date Receive
ee Faid
Permit Number
State of North Carolina sWri`�K `3113 0�
:sr� ; Department of Environment and Natural Resources
'�Md ,L�S Division of Water Quality
RlEcuwz
p6ORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original MAR 1 Q 2006
I. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): D e p Q_Y1lARO
Dare County Board of Education
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Jim Winebarger, Director of Maintenance & Construction
3. Mailing Address for person listed in item 2 above:
P.O. Box 640
City Manteo State NC Zip: 27954
Telephone Number: ( 252) 473-3635
4. Project Name (subdivision, facility, or establishment name -should be consistent with project name on plans.
specifications, letters, operation and maintenance agreements, etc.):
Manteo�Middle School
5. Location of Project (street address):
34 ac. tract of land across from Mother Vineyard Rd. (S.R. 1120) on US Hwy. 64/264
City Nags Head Township
Dare
6. Directions to project (from nearest major intersection):
Adjacent to the intersection of Mother Vineyard Rd. and U.S. Hwy. 641264
7. Latit
35' 54' 00"
Longitude: 75' 40' 00"
8. Contact person who can answer questions about the project:
Name: Mr. Mark Bissell, P.E. Telephone Number:
11I. PERMIT INFORINIATION:
L Specify whether project is (check or. New Renewal
of project
[phone]
X Modification
Form SWU-101 Version 3.99 Pagc I ot4

2. If this application is being submitted as a result of a renewal or modification to an existing permit, list the
existing permit number and its issue date (if known)
3. Specify the type of project (check one):
Low Density X High Density Redevelop
General Permit Other
4. Additional Project Requirements (check applicable blanks):
CAMA Major X Sedimentation/Erosion Control 404/401 Permit
Information on required state permit can be obtained by contacting the Customer Service Center at
1-877-623-6748
III. PROJECT INFORMATION
NPDES Stormwater
1. In the space provided below, summarize how stormwater wilt be treated. Also attach a detailed narrative
(one to two pages) describing stormwater management for the project.
Stormwater runoff from all impervious surfaces will flow overland into a combination of vegetative filters,
vegetative buffers, and infiltration basins
2. Stormwater runoff from this project drains to the
Pasquotank
River Basin
3, Total Project Area: 34.08 acres
4. Project Built Upon Area:
17.40%
5. How many drainage areas does the project have? 8
6. Complete the following information for each drainage area. If there are more than two drainage areas in the project,
attach an additional sheet with the information for each area provided in the same format as below.
Basin Information
Drainage Area 1
Drainage Area 2
Drainage Area 3
Receiving Stream Name
Roanoke Sound
Roanoke Sound
Roanoke Sound
Receiving Stream Class
SC
SC
SC
Drainage Area
3.3
0.48
3.37 ac.
Existing Impervious* Area
0 ac.
0 ac.
0 ac.
Proposed Impervious* Area
0 ac.
0 ac.
1.64 ac.
% Impervious* Area (total)
0.00%
0.00%
48.59%
Impervious* Surface. Area--
Drainage Area 1-
Drainage Area 2
Drainage Area 3 ,
On -Site Buildings
0
0 ac.
18,897 s.f. or 0.43 ac.
On -Site Streets
0
0 ac.
2,960 s.f or 0.07 ac.
On -Site Parking
0
0 ac.
36,582 s.f. or 0.84 ac.
Other On -Site
0
0 ac.
12,889 s.f. or 0.30 ac.
Off -Site
0
0
0
% Impervious* Area (total)
0
0 ac.
71,328 sf or 1.64 ac.
*Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sideivalks, gravel areas, etc.
Form S W U- t 0l Version 399 Page 2 of 4

BPG, INC. FIRST SOUTH BANK
P.O. SOX 1068 KILL DEVIL HILLS, NC 27948
KITrY HAWK, NC 27949 66 7162 z531 3/9/2006
PAY TO THE North Carolina Division of Water Quality `"420.00
ORDER OF
Four Hundred Twenty and 001100,.rtt*'"**'*•"*•�*�+..**~*****�•�..}**�*.**-*-,**-•»**•--,,,*•-».**.,..�..{,t.
North Carolina
Division of Water Quality
MEMO Amended Permit # 1(0/7

3/9/2006
12560
12560
420.00
First South Checking Amended Permit 420.00

3. Specify the type of project (check one):
Low Density X High Density Redevelop General Permit Other
4. Additional Project Requirements (check applicable blanks):
CAMA Major -� Sedimentation/Erosion Control 404/401 Permit NPDE,
Information on required state permit can be obtained by contacting the Customer Service Center at
1-877-623-6748
III. PROJECT INFORMATION
1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative
(one to two pages) describing stormwater management for the project.
Stormwater runoff from all impervious surfaces will flow overland into a combination of vegetative filters,
vegetative buffers, and infiltration basins
2. Stormwater runoff from this project drains to the Pasquotank River Basin
3. Total Project Area: 34.08 acres 4. Project Built Upon Area: 17.40%
5. How many drainage areas does the project have? 8
6. Complete the following information for each drainage area. If there are more than two drainage areas in the project,
attach an additional sheet with the information for each area provided in the same format as below.
Basin information
Drainage Area 4 ..
`'Drainage Areas -'
Drainage Area6
Receiving Stream Name
Roanoke Sound
Roanoke Sound
Roanoke Sound
Receiving Stream Class
SC
SC
SC
Drainage Area
1.91
3.01 ac.
7.01 ac.
Existing Impervious* Area
0 ac.
0 ac.
0 ac.
Proposed Impervious* Area
0.78 ac.
1.09 ac.
0.23 ac.
Impervious* Area (total)
40,67%
26.04%
3.28%
impervious* Surface Area
Drainage Area 4
e. Drainage Area 5
Drainage Area 6
On -Site Buildings
3,522 s.f. or 0.08 ac.
37,524 s.f. or 0.86 ac.
0
On -Site Streets
18,424 s.f, or 0.42 ac.
0
5,659 s.f. or 0.13 ac.
On -Site Parking
0
0
0
Other On -Site
11,930 s.f. or 0.27 ac.
9,997 s.f, or 0.23 ac.
4,511 s.f. or 0.10 ac.
Off -Site
0
0
0
% Impervious* Area (total)
33,876 s.f. or 0.78 ac. 1
47,521 s.f. or 1.09 ac.
10,170 s.f or 0.23 ac.
*Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas
sidewalks, gravel areas, etc.

3. Specify the type of project (check one):
Low Density X High Density Redevelop General Permit Other
4. Additional Project Requirements (check applicable blanks):
CAMA Major X Sedimentation/Erosion Control 404/401 Permit NPDE:
Information on required state permit can be obtained by contacting the Customer Service Center at
1-877-623-6748
III. PROJECT INFORMATION
1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative
(one to two pages) describing stormwater management for the project.
Stormwater runoff from all impervious surfaces will flow overland into a combination of vegetative filters,
vegetative buffers, and infiltration basins
2. Stormwater runoff from this project drains to the
Pasquotank
River Basin
3. Total Project Area: 34.08 acres
4. Project Built Upon Area:
17,40%
5_ How many drainage areas does the project have? 8
6. Complete the following information for each drainage area. If there are more than two drainage areas in the project,
attach an additional sheet with the information for each area provided in the same format as below.
Basin=Information
Drainage Area 7
Drainage Area 8
Receiving Stream Name
Roanoke Sound
Roanoke Sound
Receiving Stream Class
SC
SC
Drainage Area
11.5 ac_
2.34 ac.
Existing Impervious* Area
0 ac.
0 ac.
Proposed Impervious* Area
1.27 ac.
0.92 ac.
% Impervious* Area (total)
11.04%
39.24%
Impervious* Surface Area
Drainage Area 4
Drainage Area 5
On -Site Buildings
8,918 s.f. or 0.20 ac.
0
On -Site Streets
28,425 s.f. or 0.65 ac.
36,050 s.f. or 0.83 ac.
On -Site Parking
0
0
Other On -Site
18,052 s.f, or 0.41 ac.
3,920 s.f. or 0.09 ac.
Off -Site
0
0
% Impervious* Area (total)
55,395 s.f. or 1.27 ac.
39,970 s.f. or 0.92 ac.
*Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas
sidewalks, gravel areas, etc.

7. How was the off -site impervious area listed above derived? NIA
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
The following italicized deed restrictoons and protective covenants are required to be recorded for all subdivisions,
outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table listing each lot
number, size and the allowable built -upon area for each lot must be provided as an attachment.
The following covenants are intended to ensure ongoing compliance with state stormwater management permit
number as issued by the Division of Water Quality. These covenants
may not be changed or delted without consent of the State.
No more than square feet of any lot shall be covered by structures or impervious materials.
Impervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but do not include
wood decking or the water surface of swimming pools.
3. Swales shall not be filled in, piped, or altered except as necessray to provide driveway crossings.
4. Built -upon area in excess of the permitted amount requires a state stormwater management permit modification
prior to construction.
All permitted runofffrom outparcels or future development shall be directed into the permitted stormwater control
system. These connections to the stormwater control system shall be performed in a manner that maintains the
integrity and performance of the system as permitted.
By your signature below, you certify that the recorded deed restrictions and protective covenants for this project
shall include all the applicable items required above, that the covenants will be binding on all parties and persons
claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted
without concurrence from the State, and that they will be recorded prior to the sale of any lot.
V. SUPPLEMENT FORMS
The applicable state stormwater management permit supplement form(s) listed below must be submitted
for each BMP specified for this project. Contact the Stormwater and General Permits Unit at [phone]
for the status and availability of these forms.
Form SWU-102
Wet Detention Basin Supplement
Form SWU-103
Infiltration Basin Supplement
Form SWU-104
Low Density Supplement
Form SWU-105
Curb Outlet System Supplement
Form SWU-106
Off -Site System Supplement
Form SWU-107
Underground Infiltration Trench Supplement
Form SWU-108
Neuse River Basin Supplement
Form SWU-109
Innovative Best Management Practice Supplement
Form SWU-101 Version 3.99 Page 3 of

VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the appropriate DWQ Regional Office.
Please indicate that you have provided the following required information by initaling in the space provided
next to each item.
Initi s
Original and one copy of the Stormwater Management Permit Application Form MSB
' One copy of the applicable Supplement Form(s) for each BMP MSB
• Permit application processing fee of $420 (payable to NCDENR) MSB
• Detailed narrative description of stormwater treatment/management MSB
• Two copies of plans and specifications, including: MSB�a
- Development/Project Name
- Engineering and firm
- Legend
- North arrow
- Scale
- Revision number & date
- Mean high water line
- Dimensioned property/project boundary
- Location map with named streets or NCSR numbers
- Original contours, proposed contours, spot elevations, finished floor elevations
- Details of roads, drainage features, collection systems, and stormwater control measures
- Wetlands delineated, or a note on plans that none exist
- Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations
- Drainage areas delineated
- Vegetated buffers (where required)
VII. AGENT AUTHORIZATION
If you wish to desginate authority to another individual or firm so that they may provide information on your
behalf, please complete this section. e--) .�%
Designated agent (individual or firm):
Mailing Address:
City �i�, 1'�� ` State:
Phone: SZ• Z- �' 3 Z W 6
Vill APPLICANT'S CERTIFICATION
$1 4
I�
Zip
Fax: [phone]
I, (print or type name of person listed in General Information, item 2) Jim Winebarger, Director of Maintenance & Construction
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recordedand that the proposed project complies with the requuirements of 15A
NCAC 21-1.1000.
Signature:
Date: 2'O(zz
Form SWU-101 Version 3.99 Page of

LUP y771LLLLL�
The G0a,5talf)(perts
Hand Delivered ❑ Over-Nite Mail El Faxed Mailed
To: Mr. William Moore Date: March 09, 2006
Division of Water Quality
N.C.D.E.N.R
943 Washington Sq. Mall
Washington, NC 27889
Project: Manteo Middle School
We Transmit:
Herewith: �x
FOR YOUR:
x approval
review & comments
use
other
Copies
Description
Project No.: 4017
Date
RECEIVED
MAR 1 0 2606
DWQ-WARO
1 Revised Manteo Middle School Grading Plan 3-9-06
1 Revised High Density Infiltration Stormwater
calculations and narrative
1 $420 application fee w/ revised application &
supplements
Comments:
Bill,
As previously discussed, BPG is forwarding the revised Stormwater
management plans, application package, & review fee for Manteo Middle
School. If there are any comments or questions pertaining to the material
within the contents of this package, please do not hesitate to contact me.
Sincerely,
Bissell Professional Group
qa4mci/�i.
David M. Klebitz
P.O. Sox 1068 ■ 3512 N. Croatan Hwy. ■ Kitty Hawk, NC 27949
252-261-3266■ Fax:[phone] ■ E-mail:[e-mail]

. Permit No.
(to be provi e y
Sta#e of North Carolina ��������
Department of Environment and Natural Resources
Division of Water Quality
OCT - 3 2006
STORMWATER MANAGEMENT PERMIT APPLICATION FORM INFILTRATION BASIN SUPPLEMENT D,,fi�rr Q-WARO
This form may be photocopied for use as an original
DW) Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a stormwater management permit application, an
infiltration basin supplement for each system, design calculations, soils report and plans and specifications
showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name : Manteo Middle School
Contact Person: Mr. Marie Bissell, P.E. Phone Number: t [phone]
This worksheet applies to: Basin No. Inf-Basin#1
(as identified on plans)
in Drainage Area 4
(from Form SWU-101)
IL DESIGN INFORMATION Attach supporting calculations/documentation. The soils report must be
based upon an actual field investigation and soil borings. County soil maps are not an acceptable source
of soils information. All elevations shall be in feet mean sea level (fmsl).
Soils Report Summary
Soil Type Baymeade Fine Sand
Infiltration Rate 6.0-20.0 in/hr or ef/hr/sf (circle appropriate units)
SHWT Elevation 8.0' fmsl (Seasonal High Water Table elevation)
Basin Design Parameters
Design Storm 1.0
Design Volume
Drawdown Time
Basin Dimensions
Basin Size
2888
Basin Volume Provided 26715
Basin Elevations
inch (1.5 inch eventforS4 waters, I inch eventfor others)
c.f.
Bottom Elevation 10.5 fmsl
Storage Elevation 12.5 finsl
Top Elevation 12.5 fmsl
Page 1 of 3
(irregular geometry see attached plan)
_16 SW sq. ft. (bottom dimensions)
Form SWU-103 Rev.399

III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Manual
(N.C. Department of Environment, Health and Natural Resources, February 109) and Administrative Coc'
Section: 15 A NCAC 211 .1008.
Initial in, the space provided to indicate that -the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Storrnwater Management Permit
Application Form, the agent may initial below. Attach justification ifa:requirement has not been met.
itials
a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
b. System is located at%least 100 feet from water supply wells.
c. Bottom of system is at least 2 feet above the -seasonal high-water table:
d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon.
e. System is not sited on or in fill material or DWQ approval has been obtained.
f.
System is located in a recorded drainage easement1or the purposes of .operation and
maintenance and has recorded access easements to the nearest public right-of-way.
Drainage area for the device is less than 5 acres.
Soils have a minimum hydraulic conductivity. of 0.52 inches per hour` and soils report is
attached.
System captures and infiltrates the runoff from the first 1:O inch ot?iaiafall (1,5. inch event
for areas -draining to. SA waters ). Design:volum and infiltradbn*calcul&bons attached.
_'
System is sized to take into account the runoff at the ultimate built -out potential from all
surfaces draining to the system, including any off -site drainage. Calculationsrattached.
k. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H: V).
1. A pretreatment device such as a catch basin, grease trap, filter strip, grassed swale or
sediment trap is prided.
m. Bottom of the device is covered with a layer of clean sand. to an,average'depth: of 4-inches
or dense vegetative cover is provided.
4-9 rrJ+WS n. Vegetated filter is provided for overflow and detail .is -shown on plans (Required minimum
N n� length is 50 feet for SA waters, 30 feet for other waters)..
"„i :r Flow distribution mechanism within the basin.is provided.
6,4 T If A benchmark is provided to determine the, sediment accumulation in the pretreatment .
device.
A� av�rl�co`✓ .
Ai-rt 7q. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
r. System is designed to draw down the design storage volume to the proposed bottom
elevation under seasonal high water conditions within five days. A soils report and all
pertinent draw -down calculations are attached.
s.. Plans ensure that the installed system will meet design specifications (constructed or
restored) upon initial operation once the project is complete and the entire drainage area is
stabilized.
Form SWU-103 Rev 3:99 Page 2 of 3

IV. INFILTRATION BASIN OPERATION AND MAINTENANCE AGREEMENT
1. After every runoff producing rainfall event and at least monthly inspect the infiltration system for erosion,
trash accumulation, vegetative cover, and general condition.
2. Repair eroded areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow
vegetated cover to maintain a maximum height of six inches, and remove trash as needed.
3. After every runoff producing rainfall event and at least monthly inspect the bypass, inflow and overflow
structures for blockage and deterioration. Remove any blockage and repair the structure to approved
design specifications.
4. Remove accumulated sediment from the pretreatment system and infiltration basin annually or when
depth in the pretreatment unit is reduced to 75% of the original design depth-. The system shall be restored
to the original design depth without over -excavating. Over -excavating may cause the required water
table separation to be reduced and may compromise the ability of the system to perform as designed.
Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a manner
that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
A benchmark shall be established in the pretreatment unit_ The benchmark will document the original
design depth so that accurate sediment accumulation readings can be taken. The measuring device used
to determine the depth at the benchmark shall be such that it will give an accurate depth reading and not
readily penetrate into accumulated sediments.
When the design depth reads 11.L3 . feet in the pretreatment unit, the sediment shall be
removed from both the pretreatment unit and the infiltration basin.
5. If the Division determines that the system is failing, the system will immediately be repaired to original
design specifications. If the system cannot be repaired to perform its design function, other stormwater
control devices as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the five
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 and Title: _,}n!�L`5 r1. `1 W � ,
Address:. P.U. 51-�X GqO :M4ft-A)IeD 4 a - Z7ciS
Phone: Zs Z - W7 3 ' 3 (- 3 5 ;�_ . Date:
Signat
Note: The legally responsible party should ngs 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.
1 '
I aaNNotary Public for the State of C"",L"'Gunty of
71
-_ 4_Q , do hereby certify that `� fCi rim �� ii 1.. 3 � '� ti'L personally appeared before me this`
day of ,_IL -?� c ��� and acknowledge the due execution of the forgoing infiltration basin maintenance `
requirements. Witness my hand and official seal,
S 'OFFICIAL -SEAL' My commission expires / fL-
Notary Pjjbfic, North Carolina
C).-s.ty of Dare
Nar!C'.y W. Warren
F Cod wza, B9y. ires4/1012010 Page 3 of 3

Drainage Basin #4
2/22/2006
Stormwater Management Calculations
Design Storm Event 1.0 in. rainfall event
Stormwater Management 15A NCAC 211.1005 3(h)
Total Drainage Area
On -site Drainage Area 1.91 ac.
Off -Site Drainage Area 0 ac.
Total Drainage Area 1.91 ac.
Soils Report Data
Soil Type* Bayrneade Fine Sand
Infiltration Rate* (IR) 6.0 in/hr.
Apparent Water Table Elev.** 48 in.
*Taken from the Soil Survey Manual, U.S. Dept. of Agriculture
**Data taken from On -Site Field Investigation
Total # of Drainage Basins
Drainage Basin Area #4 83,291 s.f.
Drainage Basin #4
Description
Area
(FT 1)
Factor
©
Adj. Impervious
Area (FT i }
Asphalt Bus Loop
18,424
1.00
18,424
Conc. Sidewalk
9,381
1.00
9,381
Landscaping Stone
2,549
1.00
2,549
Building
3,522
1.00
3,522
Impervious Coverage Total 33,876
Adjusted Impervious Coverage Total
Total Basin Area (ft 2 )
Calculated Impervious Coverage
Percent Impervious (I)
Rv = .05+ .009(I)
Required Pond Volume (ft3) = (I "112")xR vxDA 1 x43,560
Proposed Pond Storage Depth
jj Surface Area Provided @ Pond Bottom (SA
Surface Area Provided !- Storage Elevation (SA
Existing Ground Elevation
Proposed Basin Bottom Elevation (TP e� )
Proposed Storage Elevation (St,)
Total Storage Volume Provided (SV)
Storage Volume Provided>Storage Volume Req'd
Ratio of storage volume provided to storage volume required
Drawdown Calculations
Qd,.wdow" = (SV/SAw,,..)/tR
Total Storage Volume Provided
Proposed Basin Bottom Surface Area (SA tpnom )
Soil Infiltration Rate 6.00 in/hr
Drawdown Period
Drawdown Period
Drawdown Period is C 5 days
O.K.
33,876
83,291
33,876
41
0.42
2,888
2.0
6,599
20,116
12
10.50
12.50
26,715
O.K.
9.25
0.42
0.22
0.06
0.08
0.78
0.78
1.91
0.78
ft3
ft.
ft2
ft2
ft. msl
ft. ms]
ft. msl
ft3
26,715 ft'
6,599 ft2
0.50 W/hr/ft2
8.13 hrs
0.34 days
ac.
ac.
ac.
ac.
ac.
ac.
ae.
ac.

Drainage Basin #8
2/22/2006
Stormwater Management Calculations
Design Storm Event 1.0 in. rainfall event
Stormwater Management 15A NCAC 2H.1005 3(b)
Total Drainage Area
On -site Drainage Area 2.34 ac.
Off -Site Drainage Area 0 ac.
Total Drainage Area 2.34 ac.
Soils Report Data
Soil Type* Baymeade Fine sand
Infiltration Rate* (IR) 6.0 in/hr.
Apparent Water Table Eiev.** 54 in.
*Taken from the Soil Survey Manual; U.S. Dept. of Agriculture
**Data taken from On -Site Field Investigation
Total # of Drainage Basins
Drainage Basin Area #8 101,872 s.f.
Drainaee Basin #3
Description
Area
(FT 2)
Factor
©
Adj. Impervious
Area (FT 2 }
Asphalt Parking & Drive
36,050
1.00
36,050
Conc. Sidewalk
3,920
1.00
3,920
Impervious Coverage "Total 39,970
Adjusted Impervious Coverage Total
Total Basin Area (ft 2 )
� Calculated Impervious Coverage
iJw Percent Impervious([)
Ole Rv = .05+ .009(I)
Required Pond Volume (ft3) = (1'712")xR xDA Ix43,560
Proposed Pond Storage Depth
Surface Area Provided @ Pond Bottom (SA
`j n Surface Area Provided @ Storage Elevation (SA Slo, , )
Existing Ground Elevation
Proposed Basin Bottom Elevation (TPere,,)
Proposed Storage Elevation (S ere,, )
Total Storage Volume Provided (SV)
Storage Volume Provided>Storage Volume Req'd
Ratio of storage volume provided to storage volume required
Drawdown Calculations
Qdrawdown — (SV/SAb0tt0m)/1R
Total Storage Volume Provided
Proposed Basin Bottom Surface Area (SA bottom )
Soil Infiltration Rate 6.00 in/hr
Drawdown Period
Drawdown Period
Drawdown Period is c 5 days
A",
39,970
101,872
39,970
39
0.40
3,422
2.5
11,616
15,367
11.5
9.50
12.00
33,729
Q.K.
9.86
0.83
0.09
0.92
0.92
2.34
0.92
a/o
ft3
ft.
ft2
ft2
ft. rnsi
ft. msl
ft. rnsl
ft3
33,729 ft3
11,616 ft2
0.50 W/hr/ftz
5.83 hrs
0.24 days
ac.
ac.
ac.
ac.
ac.
ac.

Drainage Basin 43
2/22/2006
Stormwater Management Calculations
Design Storm Event 1.0 in. rainfall event
Storm water Managemen t 15A NCAC 2H.1005 3(h)
Total Drainage Area
On -site Drainage Area 3.37 ac.
Off -Site Drainage Area 0 ac.
Total Drainage Area 3.37 ac.
Soils Report Data
Soil Type" Baymeade Fine sand
Infiltration Rate' (IR) 6.0 in/hr.
Apparent Water Table Elev.+i 48 in.
*Taken from the Soil Survey Manual, U.S. Dept. of Agriculture
**Data taken from On -Site Field Investigation
Total # of Drainage Basins
Drainage Basin Area #3� 146,788 s.f.
Drainage Basin #3
Description
Area
(FT `)
Factor
©
Adj. Impervious
Area (FT `)
Asphalt Parking & Drives
36,582
1.00
36,582
Conc. Sidewalk
10,034
1.00
10,034
10' Asphalt Emergency Access Drive
428
1.00
428
18' Gravel Access Road
2,532
1.00
2,532
Landscaping Stone
2,855
1.00
2,855
Building
18,897
1.00
18,897
Impervious coverage Iotat I1,s[u
Adjusted Impervious Coverage Total
Total Basin Area (ft 2)
Calculated Impervious Coverage
Percent Impervious(I)
Rv = .05+ .009(I)
Required Pond Volume (/?3) = (1 "112")xR „xDA tx43,560
Surface Area Provided @ Pond I Bottom (SA t,,„o,,, )
Surface Area Provided @ Pond 1 Storage Elevation (SA araroge )
Proposed Basin I Bottom Elevation (TP ere,)
' Proposed Basin I Storage Elevation (S ew)
Storage Volume of Basin 1 Provided (SV)
Surface Area Provided @ Pond IA Bottom (SA b,,,m )
Surface Area Provided @ Pond IA Storage Elevation (SA Sto,,,ge )
cw, ';Ax Proposed Basin IA Bottom Elevation (TP etev )
Proposed Basin IA Storage Elevation (S eL.„)
JA Storage Volume of Basin IA Provided (SV)
Total Storage Volume Provided (Si)
Storage Volume Provided >Storage Volume Req'd
Ratio of storage volume provided to storage volume required
Drawdown Calculations
Qd,,wdown = (SV/SAbttom)/1R
Total Storage Volume Provided
Proposed Basin Bottom Surface Area (SA bouom )
Soil Infiltration Rate 6.00 in/hr
Dra;vdovvn Period
Drawdown Period
Drawdown Period is < 5 days
O.K.
71,328
146,788 '
71,328
49
0.49
5,961
14,514
20,778
11.5
13.0
26,469
5,145
9,000
11.00
13.00
14,145
40,614
O.K.
6.81
0.84 ac.
0.23 ac.
0.01 ac.
0.06 ac.
0.07 ac.
0.43 ac.
1.64 ac.
1.64 ac.
3.37 ac.
1.64 ac.
ft3
ft2
ft2
ft
ft
ft3
ft2
ft2
ft. ms]
ft. msl
ft3
0
40,614 ft3
19,659 ft2
0.50 ft3/hr/ft2
4.15 hrs
0.17 days

Drainage Basin #5
2/22/2006
Stormwater Management Calculations
Design Storm Event 1.0 in. rainfall event
Storntwater Management 15A NCAC 2H.1005 3(b)
Total Drainage Area
On -site Drainage Area 3.01 ac.
Off -Site Drainage Area 0 ac.
Total Drainage Area 3.01 ac.
Soils Report Data
Soil Type* Icaria Loamy Fine Sand
Infiltration Rate* (IR) 2.0 in/hr.
Apparent Water Table Elev.** 36 in.
*Taken from the Soil SurveyManua4 U.S. Dept. of Agriculture
**Data taken from On -Site Field Investigation
Total # of Drainage Basins
Drainage Basin Area #5 182,477 s.f.
nrninnoe Ravin 05
Description
Area
(FT')
Factor
©
Adj. Impervious
z )
Area (FT)
Cone. Sidewalk
5,536
1.00
5,536
Landscaping Stone
4,461
1.00
4,461
Building
37,524
1.00
37,524
Impervious Coverage Total 47,521
Adjusted Impervious Coverage Total
Total Basin Area (ft Z)
Calculated Impervious Coverage
Percent Impervious(I)
Rv = .05+ .009(I)
Required Pond Volume (ft3) _ (1 "112")xR „xDA 1 x43,560
�� 1 Proposed Pond Storage Depth
2l'
Surface Area Provided @Pond Bottom (SA morn )
Surface Area Provided @ Storage Elevation (SA stuns, )
Existing Ground Elevation
Proposed Basin Bottom Elevation (TP,tet,)
Proposed Storage Elevation (S,,,)
Total Storage Volume Provided (SV)
Storage Volume Provided>Storage Volume Req'd
Ratio of storage volume provided to storage volume required
Drawdown Calculations
Qdsawd.., = (SWSAbattom)llR
Total Storage Volume Provided
Proposed Basin Bottom Surface Area (SA
Soil Infiltration Rate 2.00 inlhr
Drawdown Period
Drawdown Period
Drawdown Period is < 5 days
O.K.
47,521
182,477
47,521
26
0.28
4,324
1.5
12,818
18,160
11
10.50
12.00
23,234
O.K.
5.37
0.13
0.10
0.86
1.09
1.09
4.19
1.09
%a
ft3
ft.
ft2
ft2
ft. rnsl
ft. msl
ft. msl
ft3
23,234 ft3
12,818 ft2
0.17 ft31hr1ft'
10.92 hrs
0.45 days
ac.
ac.
ac.
ac.
ac.
ac.
ac.

Drainage Basin #6
3/3/2006
Stormwater Management Calculations
Design Storm Event 1.0 in. rainfall event
Stormwater Management 15A NCAC 2N.1005 3(b)
Total Drainage Area
On -site Drainage Area 7.01 ac.
Off -Site Drainage Area 0 ac.
Total Drainage Area 7.01 ac.
Soils Report Data
Soil Type* Baymead Fine Sand
Infiltration Rate' (IR) 6.0 in/hr.
Apparent Water Table Elev.** 36 in.
*Taken from the Soil Survey Manual, U.S. Dept. of Agriculture
**Data taken from On -Site Field Investigation
Total # of Drainage Basins
Drainage Basin Area #6 305,163 s.f.
Drainage Basin #6
Description
Area
(FT 2)
Factor
©
Adj. Impervious
Area (FT 2 )
9' Asphatt Foot Path
3,784
1.00
3,784
Cone. Sidewalk
727
1.00
727
10' Asphalt Emercency Access Drive
5,659
1.00
5,659
Impervious Coverage Total 10,170
Adjusted Impervious Coverage Total
Total Basin Area (ft 2)
Calculated Impervious Coverage
Percent Impervious(I)
Rv = .05+ .009(I)
Required Pond Volume (ft3) = (1 "112")xR,,xDA 1x43,560
Proposed Swale Storage Depth
��t✓ Length of vegetative infiltration swale
Flow area of vegetative swale
Existing Ground Elevation
Proposed Basin Bottom Elevation (TPete1.)
Proposed Storage Elevation (S,,,)
Total Storage Volume Provided (SV)
Storage Volume Provided > Storage Volume Req'd
Ratio of storage volume provided to storage volume required
Drawdown Calculations
Qd,..d. ` (S V/S" .11..)/I R
Total Storage Volume Provided
Proposed Basin Bottom Surface Area (SA
Soil Infiltration Rate 6.00 in/hr
Drawdown Period
Drawdown Period
Drawdown Period is < 5 days
O.K.
10,170
305,163
10,170
3
0.08
2,034
1.5
537
6.75
12
10.50
12.00
3,625
O.K.
1.78
0.09
0.02
0.13
0.23
0.23
7.01
0.23
ft3
ft.
1. f.
s.f.
ft. rnsl
ft. msl
ft. ms]
ft3
3,625 ft3
537 ft2
0.50 ft3/hr/ft2
13.55 hrs
0.56 days
ac.
ac.
ac.
ac.
ac.
ac.
ac.

Drainage Basin ##7
3/3/2006
Stormwater Management Calculations
Design Storm Event 1.0 in. rainfall event
Stormwater Management 15A NCAC 2H.1005 3(6)
Total Drainage Area
On -site Drainage Area 11.50 ac.
Off -Site Drainage Area 0 ac.
Total Drainage Area 11.50 ac.
Soils Report Data
Soil Type{ Baymeade Fine sand
Infiltration Rate' (IR) 6.0 in/hr.
Apparent Water Table Elev."* 48 in.
*Taken from the Soil Survey Manual, U.S. Dept. of Agriculture
**Data taken from On -Site Field Investigation
Total # of Drainage Basins
Drainage Basin Area #7 500,736 s.f.
Drainsee Basin #3
Description
Area
(FT 2)
Factor
©
Adj. Impervious
Area (FT z)
Tennis & Basketball Courts
14,400
1.00
14,400
Conc. Sidewalk
2,158
1.00
2,158
10' Asphalt Emercency Access Drive
1,620
1.00
1,620
18' Gravel Access Road
26,805
1.00
26,805
Landscaping Stone
1,494
1.00
1,494
Building
8,918
1.00
8,918
Impervious Coverage Total 55,395
Adjusted Impervious Coverage Total
Total Basin Area (ft 2 )
Calculated Impervious Coverage
Percent Impervious (I)
Rv = .05 + . 009(I)
Required Pond Volume (ft3) _ (1 "/I2")xR „xDA 1 x43, 560
Proposed Swale Storage Depth
Length of vegetative infiltration swale
Flow area of vegetative swale
Existing Ground Elevation
Proposed Basin Bottom Elevation (TPe1� )
Proposed Storage Elevation (S
Total Storage Volume Provided (SV)
Storage Volume Provided>Storage Volume Req'd
Ratio of storage volume provided to storage volume required
Drawdown Calculations
Qdrawd.. = (SV/SAt,.,tom)/1R
Total Storage Volume Provided
Proposed Basin Bottom Surface Area (SA nonom )
Soil Infiltration Rate 48.00 in/hr
Drawdown Period
Drawdown Period
Drawdown Period is < 5 clays
O. K.
55,395
500,736
55,395
11
0.15
6,241
1.5
1,730
6.75
12
10.50
12.00
11,678
O.K.
1.87
0.33 ac.
0.05 ac.
0.04 ac.
0.62 ac.
0.03 ac.
0.20 ac.
1.27 ac.
1.27 ac.
1150 ac.
1.27 ac.
ft3
ft.
l.f.
s. f.
ft. msl
ft. msl
ft. msl
ft3
11,678 ft'
1,730 ft2
3.98 W/hr/ft'
1.69 hrs
0.07 days

Overview Calculations 2/22/2006
Stormwater Management Calculations
Design Storm Event 1.0 in. rainfall event
Stormwater Management 15A NCAC 2H.1005 3(h) RECER VEED
Total Site Area 1,484,627 s.f
Soils Report Data 34.0823462 ac. MAR 1 0 2006
Soil Type* Baymeade, Fine sand ��yr
Infiltration Rate* (IR) 6.0 in/hr. 1)WQ-WARD
Seasonal High Water Table Elev.*} varies in.
*Taken from the Soil Survey Manual, U.S. Dept. ofAgriculture
**Data taken from On -Site Field Investigation
Impervious Coverage Breakdown
Description
Area
percentage
Asphalt Parking and Drive Area
72,632 s.f.
1.67 ac.
4.89%
Asphalt Bus Loop
18,424 s.f.
0.42 ac.
1.24%
10' Asphalt Emergency Access Dr.
7,707 s.f.
0.18 ac.
0,52%
9' Asphalt Foot Path
3,784 s.f.
0.09 ac.
0.25%
18' Gravel Access Rd.
29,337 s.f.
0.67 ac.
1.98%
Total Concrete Walk path
31,756 s.f.
0.73 ac.
2.14%
Tennis & Basketball Courts
14,400 s.f.
0.33 ac.
0.97%
Landscaping Stone
11,359 s.f.
0.26 ac.
0.77%
Total Building
68,861 s.f.
1.58 ac.
4.64%
Total
258,260 s.f.
5.93 ac.
17,40%
% Impervious Coverage
17.40%
Athletic Field Breakdown
Description
Area
Football Field
57600 s.f.
1.32 ac.
Baseball Field
53093 s.f.
1.22 ac.
Soccer Field
64794 s.f.
1.49 ac.
Softball Field
25250 s.f.
0.58 ac.
Total
200737 s.f.
4.61 ac.

Drainage Basin #1
2/22/2006
Stormwater Management Calculations
Design Storm Event 1.0 in. rainfall event
Stormwater Management 15A NCAC 2H.1005 3(6)
Total Drainage Area
On -site Drainage Area 3.30 ac.
Off -Site Drainage Area 0 ac.
Total Drainage Area 3.30 ac.
Soils Report Data
Soil Type* Baymeade Fine sand
Infiltration Rate* (IR) 6.0 in/hr.
Apparent Water Table Elev.** 56 in.
*Taken from the Soil Survey Manual. U.S. Dept. of Agriculture
**Data taken from On -Site Field Investigation
Total # of Drainage Basins
Drainage Basin Area #1 143,693 s.f.
No Impervious Coverage proposed

Drainage Basin #2
2/22/2006
Stormwater Management Calculations
Design Storm Event 1.0 in. rainfall event
Storm water Management I5A NCAC 2H.I005 3(b)
Total Drainage Area
On -site Drainage Area 0.48 ac.
Off -Site Drainage Area 0 ac.
Total Drainage Area 0.48 ac.
Soils Report Data
Soil Type* Baymeade Fine sand
Infiltration Rate' (IR) 6.0 in/hr.
Apparent Water Table Elev.' 48 in.
*Taken from the Soil SurveyManua4 U.S. Dept. of Agriculture
**Data taken from On -Site Field Investigation
Total # of Drainage Basins
Drainage Basin Area #2 20,839 s.f.
No Imperviious Coverage proposed

Stormwater Management Narrative:
The following developmental activities require a stormwater management permit under Rule
.1003 of the NCDENR Division of Water Quality Administrative Code for Stormwater
Management, 15A NCAC 21-1.1000. Developmental activities will result in the project being
permitted pursuant with Rule .1005 (2) (b), High Density Projects, with proposed built -upon
area of 30% or greater, with best management practices being employed via; vegetative
buffers, grassed swales, and infiltration basins. The intent of this application, to the maximum
extent possible, is to employ best management practices for all proposed developmental
activities. The project will consist of the construction of utility, parking and drainage
infrastructure improvements to service the proposed Manteo Middle School complex that is
to be located 34.08 ac. tract located off of U.S. Hwy 64/264, across from Mother Vineyard
Rd., (S.R. 1120) in Manteo, Nags Head Township, Dare County, North Carolina.
A pre -application meeting was conducted with NCDENR Division of Water Quality on
Thursday August 7, 2003, to examine the basis of design for establishing a stormwater
management plan. As per this meeting, the proposed stormwater management plan will
incorporate vegetative infiltration swales in conjunction with stormwater infiltration basins. As
recommended the capacity of the stormwater measures will store approximately 6-9 times
the required runoff generated from a 1" design storm event.
On -site visits were conducted by David Ryan of Bissell Professional Group on 7/30103
and 8/26/03 to evaluate the soil profiles and water table depth in preparation of a
preliminary design. Approximately (3) borings were taken in the proposed areas that had
been designated as potential retention measures. An additional (1) boring was
advanced at a later date after the addition of infiltration basin #2 to the design. The soil
investigation provided the useful information necessary in determining the size, type,
and location of stormwater drainage improvements for the associative developmental
activities. The following is a summary of the investigation performed;
Soil Boring B1 RECEIVED
Soil Series: Baymeade MAR 1 0 2006
Vegetation: Mixed Hardwood/Pine
Apparent Water Table: 48" 'A! �Ar
Slope: 0-2% DWQ-WAR®
Depth Description
+2"-0"
Partially decomposed needles, leaves, twigs
0-9"
dark brown decomposed organic layer
9"-14"
light brown loamy sand layer
14"-18"
brownish sandy loam layer
18"-48"+
light grayish/brown sandy loam layer
Comments: Organic Coatings on sand particles, roots to 20 inches

Soil Borina - B2
Soil Series: Icaria
Vegetation: Mixed Hardwood/Pine
Apparent Water Table: 36"
Slope: 0-2%
Depth Description
+2"-0" Partially decomposed needles, leaves, twigs
0-12" dark brown decomposed organic/fine sand layer
12"-48"+ grayish sandy clay loam layer
Comments: Organic Coatings on sand particles, roots to 20 inches
Soil Boring B3
Soil Series: Baymeade
Vegetation: Mixed Hardwood/Pine
Apparent Water Table: 48"
Slope: 0-2%
Depth Description
+4"-0" Partially decomposed needles, leaves, twigs
0-5" grayish loamy sand layer
5"-16" light brown loamy sand layer
16"-48"+ brownish sandy loam layer
Comments: Organic Coatings on sand particles, roots to 12 inches
Soil Boring B4
Soil Series: Baymeade
Vegetation: Mixed Hardwood/Pine
Apparent Water Table: 56"
Slope: 0-2%
Depth Description
+4"-0" Partially decomposed needles, leaves, twigs
0-5" grayish loamy sand layer
5"-16" light brown loamy sand layer
16"-48"+ brownish sandy loam layer
Comments: Organic Coatings on sand particles, roots to 12 inches
Soil Description_
BaC: Baymeade fine sand: Nearly level to sloping, well -drained soil found on sandy &
loamy ridges on Roanoke Island. The permeability is moderately rapid with the seasonal
high water table 4 to 5 feet below the surface. Permeability is described as 6.0--20 in/hr
for soil depths ranging from 0-32" below existing ground surface.*
IcA: Icaria loamy fine sand: Nearly level, poorly drained soil found on flats and
depressions on Roanoke Island. The permeability is moderate in the subsoil with the
seasonal high water table at or near the existing ground surface. Permeability is
described as 0.6-2.0 in/hr for soil depths ranging from 0-33" below existing ground
surface.*
• Information referenced from United States Department of Agriculture, Soil Conservation
Service, Soil Survey of Dare County, North Carolina

The site can be described as nearly level, (0-2% slopes) with moderate vegetation
concentrated along the entirety of the tract. The vegetation consists mainly of mixed loblolly
pine trees, diameters less than 15" in diameter, with understory including dogwood,
sassafrass, American Holly, and sourwood. A small ditch is located towards the eastern,
portion of the tract, with conveyance towards the existing roadway drainage swale along U.S.
Hwy. 64/264. An isolated wetland pocket and "404" jurisdictional wetlands have been
identified on the western portion of the tract. Existing overhead utility lines are located within
the U.S.Hwy 641264 100'right of -way with crape myrtle plantings and a vegetative roadway
swale network. The outer perimeter of the project is adjoined by several residential
neighborhoods.
All development activities are to be designed in conformity with the requirements for
application and issuance of permits for stormwater management systems in pursuant with
rules .1003 and .1005 in accordance with G.S. 143-215.1 and 15A NCAC 2H .0200 as set
forth. These requirements are designed to control pollutants associated with stormwater
runoff applicable to development of land for residential, commercial, industrial, or institutional
uses. The developmental activities as described above have been designed in compliance
with the requirements as set forth in stormwater management within coastal counties Rule
.1005, section 3, subparagraph B:
(i) Control systems must be infiltration systems, wet detention ponds, or alternative
stormwater management control systems designed in accordance with Rule .1008;
(ii) Control systems must be designed to control runoff from all surface generated by
one inch of rainfall.
Design of the active stormwater management measures are based on the design criteria
indicated in .1008(d) Infiltration System Requirements, under the NCDENR Division of Water
Quality Administrative Code for Stormwater Management, 1 5A NCAC 2H.1000.
Stormwater Collection
Manteo Middle School parcel is located in Manteo, Dare County, North Carolina, along U.S.
Hwy. 64/264 across from Mother Vineyard Rd, (S.R. 1120). The proposed development
consists of 68,861 s.f. school building with associative roadway, drainage & infrastructure
improvements. Rainfall runoff from the proposed impervious surfaces will primarily sheet flow
overland and into the stormwater infiltration basins and swales. Stormwater runoff from the
existing & proposed impervious surfaces will receive treatment in the form of vegetative
buffers, grassed swales, and infiltration basins. Two (2) vegetative swales located on either
side of the entrance drive will retain runoff from asphalt drive. An infiltration basin located in
the center of the bus loop will retain runoff from a portion of the structure in association with
the asphalt drives of the bus loop itself. A bio-infiltration basin located; along the northern
property line will retain stormwater runoff from the northern portion of the building and
associative side walks. The stormwater runoff from the southern portion of the building and
the adjacent parking and drive to the south will be handled by a small infiltration basin
located within the parking area and the hydraulically connected larger bio-infiltration basin
located along the southern property line.

In the western portion of the development vegetative swales located along the northern edge
of the centrally located asphalt emergency access drive and asphalt foot path, and southern
gravel access road will retain runoff from the adjoining impervious surfaces. The site has
been divided into (8) eight drainage basins in order to accommodate rainfall runoff from the
developmental activities as described above, ( please reference drainage basin layout in
Appendix A).
Vegetative buffers will be provided, to the maximum extent possible, for pollutant filtration.
The vegetative buffer is described as a passive best management practice that provides a
small degree of filtration and pollutant removal from stormwater runoff. Grassed swales
consist mainly of broad, shallow, vegetative filters constructed with approximately 3:1 side
slopes. Longitudinal slopes are kept relatively flat, to provide for low velocity flow, thereby
aiding infiltration and sediment removal. Enhanced removal efficiency from stormwater
conveyed into this measure is achieved through a minimum filtration length of 100 feet. This
practice is also described as a passive in accordance with best management practices.
Stormwater Infiltration basin design capacity is capable of storage in excess of two to three
times the 1" rainfall event prior to infiltrating into the surrounding sandy soil. The basin bed
will be planted with vegetation as described in the Soil Sedimentation & Erosion Control Plan
for the purpose of filtrating small particulate matter and pollutants. This measure is described
as an active best management practice in the treatment of stormwater runoff.
The intent of the design is to provide adequate pollutant filtration measures from stormwater
runoff resulting from the corresponding high -density pockets created by the associative
developmental activities. To achieve this, in this particular application, it was necessary to
calculate the proposed impervious surface coverage area as indicated within it
corresponding drainage basin. Measures were designed, to the maximum extent possible, to
treat runoff from the impervious surfaces in accordance with best management practices.
The tabulated impervious surface areas were utilized to compute the required storage
volume from the requiredl.0 in. rainfall storm event, (reference the stormwater calculations
attached herein).
Based on the existing density of the development, it is necessary to supply additional
drainage measures to provide adequate pretreatment, prior to discharge into the surrounding
soils and adjoining surface waters. With an existing stormwater collection network operation,
the basis of design is to incorporate the existing drainage system while providing improved
filtration of sediment and pollutants for the design storm event. This is achieved by
incorporating grassed swales and infiltration basins in conjunction with the existing vegetative
buffers to retain runoff in excess of the design storm event, prior to overflowing to the
existing drainage network_ It is expected, that this will enhance the pollutant removal
efficiency and provide sufficient protection to the adjoining surface waters.
Vegetative filters have been designed in accordance with the "vegetative filter' definition
defined in Rule .1002 of Subchapter 2H Procedures for Permits. Approvals, Stormwater
Management Rules, September 1, 1995.

Basin #1 ( Northeastern portion of the tract
The 3.30 acre area delineated as Drainage Area #1 of the Manteo Middle School complex
will remain undeveloped. No impervious surfaces are proposed at this time.
(Reference the attached Drainage Basin Layout in Appendix A for delineation of the drainage
area boundaries)
Basin #2 (Notheastern portion of the tract)
The 0.48acre area delineated as Drainage Area #2 of the Manteo Middle School complex
will remain undeveloped. No impervious surfaces are proposed at this time.
(Reference the attached Drainage Basin Layout in Appendix A for delineation of the drainage
area boundaries)
Basin #3 (Central to Southeastern portion of the tract)
The 3.37 acre area delineated as Drainage Area #3 of the Manteo Middle School complex
consists of the following: a portion of the main educational structure in conjunction with
associative asphalt drives, parking and sidewalks.
To manage stormwater runoff from the proposed asphalt drive and building
construction to service the development in Drainage basin #3, rainfall will sheet flow
overland, across the asphalt parking area, and into the (2) infiltration basins located
within the parking area and along the perimeter to the south. The rainfall will be
retained within these infiltration basins until infiltration can occur through the
subsurface layer over a period of 4.0 hrs. for a 1" rainfall event. The drainage
infrastructure improvements within Drainage Basin #3 are designed to accommodate
a rainfall event equivalent of 7.0 inches, (Reference the attached Drainage Basin
Layout in Appendix A for delineation of the drainage area boundaries)
Basin #4 (Central to Northeastern ortion of the tract)
The 1.91 acre area delineated as Drainage Area #4 of the Manteo Middle School complex
consists of the following: a portion of the main educational structure in conjunction with
associative asphalt bus loop drive and concrete sidewalks.
To manage stormwater runoff from the proposed asphalt drive and building
construction to service the development in Drainage basin #4, rainfall will sheet flow
overland, across the asphalt parking area, and into the infiltration basin located within
the center of the bus loop. The rainfall will be retained within the infiltration basin until
infiltration can occur through the subsurface layer over a period of 8.0 hrs. for a 1"
rainfall event. The drainage infrastructure improvements within Drainage Basin #4
are designed to accommodate a rainfall event equivalent of 9. inches, (Reference the
attached Drainage Basin Layout in Appendix A for delineation of the drainage area
boundaries)

Basin #5 (Central to Northeastern portion of the tract)
The 3.01 acre area delineated as Drainage Area #5 of the Manteo Middle School complex
consists of the following: a portion of the main educational structure in conjunction with
concrete sidewalk improvements.
To manage stormwater runoff from the proposed asphalt drive and building
construction to service the development in Drainage basin #5, rainfall will sheet flow
overland, across a vegetative buffer area, and into the infiltration basin located along
the northern property line. The rainfall will be retained within the infiltration basin until
infiltration can occur through the subsurface layer over a period of 11.0 hrs. for a 1"
rainfall event. The drainage infrastructure improvements within Drainage Basin #5
are designed to accommodate a rainfall event equivalent of 5. inches, (Reference the
attached Drainage Basin Layout in Appendix A for delineation of the drainage area
boundaries)
Basin #6 (Central Northern portion of the tract)
The 7.01 acre area delineated as Drainage Area #6 of the Manteo Middle School complex
consists of the following: asphalt emergency access drive and foot path improvements.
To manage stormwater runoff from the proposed asphalt drive to service the
development in Drainage basin #6, rainfall will sheet flow into the adjoining grassed
swales located on the north side of the pavement. The rainfall will be retained within
grassed swale until infiltration can occur through the subsurface layer over a period
of 14 hrs. for a 1" rainfall event. The drainage network with Drainage Basin #6 is
design to accommodate a rainfall event in excess of 1.8 inches, (Reference the
attached Drainage Basin Layout in Appendix A for delineation of the drainage area
boundaries)
Basin #7 (Southwestern portion of the tract
The 11.50 acre area delineated as Drainage Area #7 of the Manteo Middle School complex
consists of the following: a small portion of the main educational structure, the tennis courts,
a portion of the asphalt emergency access drive and southern gravel access road.
To manage stormwater runoff from the proposed asphalt drive to service the
development in Drainage basin #7, rainfall will sheet flow into the adjoining grassed
swales located on the north side of the gravel access road. The rainfall will be
retained within grassed swale until infiltration can occur through the subsurface layer
over a period of 2 hrs. for a 1" rainfall event. The drainage network with Drainage
Basin #7 is design to accommodate a rainfall event in excess of 1.9. inches,
(Reference the attached Drainage Basin Layout in Appendix A for delineation of the
drainage area boundaries)
Basin #$ Central to Northeastern portion of the tract
The 2.34 acre area delineated as Drainage Area #8 of the Manteo Middle School complex
consists of the following: the entrance road and associative concrete sidewalks and parking
lot east of the bus loop.
To manage stormwater runoff from the proposed entrance drive and parking lot
construction in Drainage basin #8, rainfall will sheet flow overland, across the asphalt
parking and into adjoining swales that feed to the infiltration basin located to the east.
The rainfall will be retained within the infiltration basin until infiltration can occur
through the subsurface layer over a period of 6.0 hrs. for a 1" rainfall event. The
drainage infrastructure improvements within Drainage Basin #8 are designed to
accommodate a rainfall event equivalent of 10. inches.

Stormwater runoff from all impervious surfaces will receive a form of pollutant and sediment
removal as described in best management practices. The following information is in
conformance with the regulations as specified for high -density development:
1) Proposed impervious coverage of 17.40% over the total development area
2) Provision of a combination of vegetative buffers, grassed swales and infiltration
basins along all proposed developmental activities to collect and transport
stormwater runoff from all impervious surfaces.
3) Provision of a 50-foot wide buffer from all adjoining surface waters.
The following measures will be provided to control the conveyance of stormwater from the
proposed high -density development:
1) Proposed impervious coverage of 17.40% over the total development area
2) Provision of vegetative filters with relatively flat longitudinal slopes aiding in
infiltration and sediment removal.
3) Utilization of vegetative buffers to aid in filtration & sediment removal
4) Provision of infiltration stormwater basins for enhanced pollutant removal
efficiency and sediment removal in association with temporary stormwater
storage.
5) Provision of approximately five -nine times the storage volume required for the
infiltration basin to provide enhanced pollutant removal efficiency and sediment
removal prior to transitioning into the adjacent ground surface waters.

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Modification Overview Manteo Middle School 3/28/2006
The following is an overview of modifications made to the previously permitted stormwater management plan
(SW7030814) for the Manteo Middle School site located in Manteo, Dare County NC.
To better understand the following modification explanations please reference following attached exhibits.
-Exhibit A- (Site Development Approval As per Stormwater Permit # SW703814)
-Exhibit B- (Comparative Analysis of Site Development Activities from Approved Stormwater Permit#
SW703814 & Final Site Development)
As given on Exhibit B, the total project area has been increased by 0.13 acres to a total of 34.08 acres, based
on additional land acquired in the southeastern corner of the property adjacent to the main entrance.
As shown on Exhibit A the original drainage plan had the site divided into (6) separate drainage areas with (3)
infiltration basins and several vegetative swales while, as shown on exhibit B, the final development is divided
into (8) drainage areas with (5) infiltration basins and (3) additional vegetative swales.
Infiltration basins 1 & 3 of the original design have been modified in shape but not in location.
Infiltration basin #1A was added within the modified eastern parking area and is hydraulically connected to
basin #1. Infiltration basin #4 was added adjacent to the additional parking area north of the bus loop. The
main entrance is now wider with swales running on both sides and flowing back to infiltration basin #4. A
gravel access rd. was added that runs along the southeastern property line with an adjacent vegetative swale
on the west side flowing to lowland areas in the southern portion of the project.
The tennis & basketball courts have been relocated and a maintenance building added just to the north of the
their revised location. The aforementioned drainage improvements were desgined to ensure that 3 times the
required storage for a 1" rainfall event is still achieved with the additional development. Below is a comparison
of the previously permitted stormwater specifications for Manteo Middle School to the updated stormwater
specifications per changes in the projects site plan.
Stormwater Specifications Permitted
Under Permit No. SW7030814
Stormwater Specifications per Plan
Revisions March 2006
Overall
Deviation
Total Site Area
33.95
ac.
Total Site Area
34.08
s.f.
0.13
ac.
Total Impervious Area
206,892
s.f.
Total Impervious Area
258,260
s.f. &
93)51,368
s.f.
Percent Impervious
1399
%
Percent Impervious
17.40
%
3
%
Total Required Storage*
13,793
ft3
Total Required Storage*
16,595
ft3
2,802
ft3
Total Available Storage*
42,743
ft3
Total Available Storage*
124,292
ft3
81,549
ft3
Storage Ratio
3.10
Storage Ratio
7.49
4.39
Avg, Draw Down Time
2.33
hrs
Avg. Draw Down Time
1.32
hrs
-1.01
hrs
* Quantity reflects only the volume of all infiltration basins combined. Additional storage is available within
various vegetated swales on site.
For more details regarding the originally permitted design please reference the grading plan dated 8-13-03.
For more details regarding the revised design please reference the grading & drainage plan dated 3-9-06. .

The Goa$talf XperCs
Hand Delivered ❑ Over -Nits Mail �x Faxed ❑ Mailed ❑
ATTN: Mr. William Moore
Division of Water Quality
N.C.D.E.N.R
943 Washington Sq. Mall
Washington, NC 27889
Project: Manteo Middle School
We Transmit:
Herewith: —I
FOR YOUR:
x approval
review & comments
use
other
Date: June 14, 2006
SW7030814 Project No.: 4017
Copies Description
2 Stormwater detail sheet
Date
0UN 15 2006
7-27-05
Comments:
Bill,
As per your request attached you will find a copy of plan sheet C5.2 that
illustrates the typical details for the infiltration/bio-filtration basins and
vegetated swales. If there are any comments or questions pertaining to this
information or if additional information is needed please do not hesitate to
contact me.
Sincerely,
Bissell Professional Group
David M. Klebitz
P.O. Box 1068 ■ 3512 N. Croatan Hwy. ■ Kitty Hawk, NC 27949
252-261-3266 ■ Fax: [phone] E-mail: bpg@ bissellprofessionalgroup.com

LEGEND
g# BORING #/LOCATION
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loft
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AppendixA
RECEIVED
MAR 1 0 2006
DWQ-WARQ

2M5LLL_
m
Tke Goagtalt )(Pertg
ADDL-:0701q Tv 3/4/c�co
Bird t svJ�b 3v8 f q Pg7Mrr
1i4o,->w,6A7taA15 F-oj Z
4A-N11�v 41 i),DL1_ S61-100L.
Hand Delivered ❑ Over-Nite Mail ❑x Faxed n Mailed ❑
ATTN: Mr. William Moore Date: March 28, 2006
Division of Water Quality
N.C.D.E.N.R
943 Washington Sq. Mall
Washington, NC 27889
Project: Manteo Middle School
We Transmit:
Herewith. Fx
FOR YOUR:
x approval
review•& comments
use
other
SW7030814 Project No.: 4017
RECEhY20
MAR 2 0 2006
Copies Description Date
1 Previously Permitted Grading Plan 8-13-03
1 Revised Grading & Drainage Plan 3-09-06
1 Plan Modification Calculations & Narrative 3-28-06
1 Exhibit A - 11x17 of original grading plan 8-13-03
1 Exhibit B - 8.5x14 Comparative Analysis 3-28-06
Comments:
Bill,
Attached you will find a copy of both the original grading plan and the revised
grading plan along with two exhibits, calculations, and a narrative explaining
and comparing the primary modifications that were made. If there are any
.comments or questions pertaining to this information or if additional
information is needed please do not hesitate to contact me.
Sincerely,
Bissell Professional Group
!1av LCl A. Y&44V�
David M. Klebitz
P.O. Box 1068 ■ 3512 N. Croatan Hwy. ■ Kitty Hawk, NC 27949
252-261-3266■ Fax:[phone] ■ E-mail:[e-mail]

w A r,�-R��
7
0 Y
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
DIVISION OF WATER QUALITY
October 9, 2003
Dare County Board of Education
Attn: Mr. Jim Winebarger
PO Box 640
Manteo, NC 27954
Subject:
Dear Mr. Winebarger:
Alan W, Klimek, P. E. Director
Division of Water Quality
Coleen H. Sullins, Deputy Director
Division of Water Quality
,See-
d4ja 6//6 1,#6
Stormwater Permit No. SW7030814
Manteo Middle School
High Density Stormwater Project
Dare County
The Washington Regional Office received your completed
Stormwater Application for the subject project on August 28, 2003.
Staff review of the plans and specifications has determined that
the project, as proposed, will comply with the Stormwater
Regulations set forth in Title 15A NCAC 2H.1000. We are forwarding
Permit No. SW7030814 dated October 9, 2003 to the Dare County Board
of Education.
This permit shall be effective from the date of issuance until
October 9, 2013 and shall be subject to the conditions and
limitations as specified therein. Please pay special attention to
the Operation and Maintenance requirements in this permit. Failure
to establish an adequate system for operation and maintenance of
the stormwater management system will result in future compliance
problems.
If any parts, requirements, or limitations contained in this
permit are unacceptable, you have the right to request an
adjudicatory hearing upon written request within thirty (30) days
following receipt of this permit. This request must be in the form
of a written petition, conforming to Chapter 150B of the North
Carolina General Statutes, and filed with the Office of
Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611--7447.
Unless such demands are made this permit shall be final and
binding.
�►A
NCC7EN€�
N. C. Division of Water Quality 943 Washington Square Mall Washington, N.C. 27889 Telephone [phone] FAX [phone]

I
Dare County Board of Education
October 9, 2003
Page Two
If' you have any questions, or need additional information
concerning this matter, please contact Bill Moore at (252) 946-
6481, extens-ion 2.64.
Sincerely,
Jim Mullig
Water Quality Regional Supervisor
Washington Regional Office
cc: Bissell Professional Group
Dare County Planning/Inspections
Washington Regional Office
Central Files

State Stormwater Management Systems
Permit No._SW7030814
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143,
General Statutes of North Carolina as amended, and other applicable
Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
Dare County Board of Education
Dare County
FOR THE
construction, operation and maintenance of stormwater management
systems in compliance with the provisions of 15A NCAC 2H.1000
(hereafter referred to as the "stormwater rules") and the approved
stormwater management plans and specifications and other supporting
data as attached and on file with and approved by the Division of
Water Quality and considered a part of this permit for vegetated
swales and (3) infiltration basins to serve the Manteo Middle
School located at Manteo, NC.
This permit shall be effective from the date of issuance until
October 9, 2013 and shall be subject to the following specified
conditions and limitations:
T. DESIGN STANDARDS
1. This permit is effective only with respect to the nature and
volume of stormwater described in the application and other
supporting data.
2. This stormwater system has been approved for the management of
stormwater runoff as described on page 4 of this permit, the
Project Data Sheet.
3. Approved plans and specifications for this project are
incorporated by reference and are enforceable parts of the
permit.
3

R
DIVISION OF WATER QUALITY
PROJECT DATA
Project Name:
Permit Number:
Location:
Applicant:
Mailing Address:
Application Date:
Water Body Receiving-Stormwater
Runoff:
Classification of Water Body:
Total Site Area:
Total Impervious
Surfaces Allowed:
Basin Depths:
Required Surface Area
(SA/DA):
Provided Surface Area:
Required Storage Volume:
(based on 1.0-inch runoff)
Provided Storage Volume:
Manteo Middle School
SW7030814
Dare County
Dare County Board of Education
PO Box 640
Manteo, NC 27954
08/28/03
UT -Roanoke Sound
SA
33.95 acres
4.5 acres
1.0 ft, all Basins
N/A
18,125
sf
- Basin
1 (NE)
7735
sf
- Basin
2 (N)
9643
sf -
Basin
3 (NW)
7161
cf
- Basin
1
3168
cf
- Basin
2
3464
cf -
Basin
3
24,918
cf -
Basin
1
9832
cf -
Basin
2
7993
cf -
Basin
3
Controlling Orifice: No outlets
►,i

4. No homeowner/lot owner/developer shall be allowed to fill in,
alter, or pipe any vegetative practices (such as swales) shown
on the approved plans as part of the stormwater management
system without submitting a revision to the permit and
receiving approval from the Division.
5. The following items will require a modification to the permit:
a. Any revision to the approved plans, regardless of size
b. Project name change
C. Change of ownership
d. Redesign or addition to the approved amount of built -upon
area
e. Further subdivision of the project area.
In addition, the Director may determine that other revisions
to the project should require a modification to the permit.
6. The Director may notify the permittee when the permitted site
does not meet one or more of the minimum requirements of the
permit. Within the time frame specified in the notice, the
permittee shall submit a written time schedule to the Director
for modifying the site to meet minimum requirements. The
permittee shall provide copies of revised plans and
certification in writing to the Director that the changes have
been made.
II. SCHEDULE OF COMPLIANCE
1. The permittee will comply with the following schedule for
construction and maintenance of the stormwater management
system.
a. The stormwater management system shall be constructed in
its entirety, vegetated and operational for its intended
use prior to the construction of any built -upon surfaces
except roads.
b. During construction, erosion shall be kept to a minimum
and any eroded areas of the system will be repaired
immediately.
2. The facilities must -be properly maintained and operated at all
times. The approved Operation and Maintenance Plan must be
followed in its entirety and maintenance must occur at the
scheduled intervals.
3. The permittee shall at all times provide the operation and
maintenance necessary to assure the permitted stormwater
system functions at optimum efficiency including, but not
limited to:
5

J
a. Semi-annual scheduled inspections (every 6 months)
b. Sediment removal
C. Mowing and revegetation of side slopes
d. Immediate repair of eroded areas
e. Maintenance of side slopes in accordance with approved
plans and specifications
f. Debris removal and unclogging of outlet structure,
orifice device and catch basins and piping.
4. Records of maintenance activities must be kept and made
available upon request to authorized personnel of DWQ. The
records will indicate the date, activity, name of person
performing the work and what actions were taken.
5. This permit shall become voidable unless the facilities are
constructed in accordance with the conditions of this permit,
the approved plans and specifications, and other supporting
data.
6. Upon completion of construction and prior to operation of this
permitted facility, a certification must be received from an
appropriate designer for the system installed certifying that
the permitted facility has been installed in accordance with
this permit, the approved plans and specifications, and other
supporting documentation. Mail the Certification to the
Washington Regional Office, 943 Washington Square Mali.,
Washington, North Carolina, 27889, attention Division of Water
Quality.
7. A copy of the approved plans and specifications shall be
maintained on file by the Permittee for a minimum of five
years from the date of the completion of construction.
III. GENERAL CONDITIONS
1. This permit is not transferable. In the event there is a
desire for the facilities to change ownership, or there is a
name change of the Permittee, a formal permit request must be
submitted to the Division of Water Quality accompanied by an
application fee, documentation from the parties involved, and
other supporting materials as may be appropriate. The
approval of this request will be considered on its merits and
may or may not be approved.
2. Failure to abide by the conditions and limitations contained
in this permit may subject the Permittee to enforcement action
by the Division of Water Quality, in accordance with North
Carolina General Statute 143-215.6(a) to 143-215.E(c).
C.1

3. The issuance of this permit does not preclude the Permittee
from complying with any and all statutes, rules, regulations,
or ordinances which may be imposed by other government
agencies (local, state, and federal) which have jurisdiction.
4. In the event that the facilities fail to perform
satisfactorily, including the creation of nuisance conditions,
the Permittee shall take immediate corrective action,
including those as may be required by this Division, such as
the construction of additional or replacement stormwater
management systems.
5. The permit may be modified, revoked and reissued or terminated
for cause. The filing of a request for a permit modification,
revocation and reissuance or termination does not stay any
permit condition.
Permit issued this the 9 th day of October, 2003.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Q
v V ,
{� Alan-W. Klimek, P.E., Director
Division of ter Quality
By Authority of the Environmental Management Commission
Permit Number SW7030814
7

Stormwater Permit No. SW7030814
Manteo Middle School
Manteo, NC
(3) Infiltration Basins
Designer's Certification
I,
, as a duly
registered Professional Engineer in the State of North Carolina,
having been authorized to observe (periodically/weekly/full time)
the construction of the project,
for
(Project)
(Project Owner)
hereby state that to the best of my abilities, due care and
diligence was used in the observation of the project construction
such that the construction was observed to be built within
substantial compliance and intent of the approved plans and
specifications.
Signature
Registration Number
Date
9