SW7060532_CURRENT PERMIT_20060530

STORMWATEF; DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. SW�
DOC TYPE- 9APPROVED
CURRENT PERMIT
PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC SATE
YYYYMMDD

�F W A TF9 Michael F. Easley, Governor
`) QG William G. Ross Jr., Secretary
co North Carolina Department of Environment and Natural Resources
0 Alan W. Klimek, P.E. Director
Division of Water Quality
May 30, 2006
Mr. Richard Olson, City Manager
City of Elizabeth City
P.O. Box 347
Elizabeth City, NC 27907
Subject: Stormwater Permit No. SW7060532
Elizabeth City Airport Apron Expansion
High Density Project '
Pasquotank County
Dear Mr. Olson:
The Washington Regional Office received a complete Stormwater Management Permit Application for the
Elizabeth City Airport Apron Expansion on May 30, 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. SW7060532 dated May 30, 2006, for the construction of the subject
project. 5- 1 30 ! 10.3-0
This permit shall be effective from the date of issuance until May 30, 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 sixty (60) days following receipt of this permit. This request
must be in the form of a written petition, conforming to Chapter 1506 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.
If you have any questions, or need additional information concerning this matter, please contact Roger Thorpe, or
myself at [phone].
Sincerely,
Al Hodge, egio al Supervisor
Surface Water Protection Section
Washington Regional Office
AHlalf
cc: Hobbs, Upchurch & Associates, P.A.
E abeth City Building Inspections
shington Regional Office
Central Files
North Carolina Division of Water Quality Internet: %%'%%,w.ncnvaterqualitv.ore
943 Washington Square Mall Phone [phone]
Washington, NC 27889 Fax [phone]
NonrthCaroiina
Naturally
An Equal Opportunity/Affirmative Action Employer — 50°% Reeycled110% Post Consumer Paper

Permit SW7060532
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
City of Elizabeth City
Elizabeth City Airport Apron Expansion
Pasquotank County
FOR THE
construction, operation and maintenance of a bioretention area 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.
This permit shall be effective from the date of issuance until May 30, 2016, and shall be subject to the following
specified conditions and limitations:
I. DESIGN STANDARDS
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 2 of this permit, the Project Data Sheet. The stormwater controls have been designed to handle the
runoff from 82,012 square feet of impervious area.
3. The tract will be limited to the amount of built -upon area indicated on page 2 of this permit, and per
approved plans.
4. All stormwater collection and treatment systems must be located in either dedicated common areas or
recorded easements. The final plats for the project will be recorded showing all such required easements,
in accordance with the approved plans.
5. The runoff from all built -upon area within the permitted drainage area of this project must be directed into
the permitted stormwater control system.

Project Data Sheet
6. The following design criteria have been provided in the bioretention area and must be maintained at
design condition:
Area 1
a.
Area, ftz
82,012
-Drainage
b,
Total Impervious Surfaces ft2
82,012
c:
TSS removal efficiency:
85%
d.
Bioretention Depth, inches:
9.0
e.
Temporary Ponded Depth Elevation,
FMSL:
6.25
f.
Bioretention Bottom Elevation,
FMSL:
5.5
g.
Bioretention Surface Area, ft2:
9,159
h.
Permitted Storage Volume W:
6,869
I.
Stream/River Basin:
UT to Pas uotank River
_Receiving
Basin Number:
PAS50 03-01-50
k.
Classification of Water Body:
SB

11. SCHEDULE OF COMPLIANCE
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 surface.
2. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be
repaired immediately.
The permittee shall at all times provide the operation and maintenance necessary to assure the permitted
stormwater system functions at optimum efficiency. The approved Operation and Maintenance Plan must
be followed in its entirety and maintenance must occur at the scheduled intervals including, but not limited
to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and revegetation of slopes and the vegetated filter.
d. Immediate repair of eroded areas.
e. Maintenance of all slopes in accordance with approved plans and specifications.
f. Debris removal and unclogging of outlet structure, flow spreader, catch basins and piping.
g. Access to the outlet structure must be available at all times.
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. The facilities shall be constructed as shown on the approved plans. This perrhit 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.
Upon completion of construction, prior to issuance of a Certificate of Occupancy, 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. Any deviations from the
approved plans and specifications must be noted on the Certification. A modification may be required for
those deviations.
7. if the stormwater system was used as an Erosion Control device, it must be restored to design condition
prior to operation as a stormwater treatment device, and prior to occupancy of the facility.
B. Access to the stormwater facilities shall be maintained via appropriate easements at all times.
9. The permittee shall submit to the Director and shall have received approval for revised plans,
specifications, and calculations prior to construction, for any modification to the approved plans, including,
but not limited to, those listed below:
a. Any revision to any item shown on the approved plans, including the stormwater management
measures, built -upon area, details, etc.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area or to the drainage area.

e. Further subdivision, acquisition, lease or sale of all or part of the project area. The project area is
defined as all property owned by the permittee, for which Sedimentation and Erosion Control Plan
approval or a CAMA Major permit was sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan.
10. The permittee shall submit final site layout and grading plans for any permitted future areas shown on the
approved plans, prior to construction.
11. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a
minimum of ten years from the date of the completion of construction.
12. 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.
13. This permit shall be effective from the date of issuance until May 30, 2016. Application for permit renewal
shalt be submitted 180 days prior to the expiration date of this permit and must be accompanied by the
processing fee.
III. GENERAL CONDITIONS
This permit is not transferable except after notice to and approval by the Director. In the event of a
change of ownership, or a name change, the permittee must submit a formal permit transfer request to
the Division of Water Quality, accompanied by a completed name/ownership change form, 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. The permittee is responsible for
compliance with all permit conditions until such time as the Division approves the transfer request.
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
143-215.6A to 143-215.6C.
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) having 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.
The permittee grants DENR Staff permission to enter the property during normal business hours for the
purpose of inspecting all components of the permitted stormwater management facility.
6. 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.
Unless specified elsewhere, permanent seeding requirements for the stormwater control must follow the
guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual.

8. Approved plans and specifications for this project are incorporated by reference and are enforceable
parts of the permit.
9. The permittee shall notify the Division any name, ownership or mailing address changes within 30 days.
Permit issued this the 30th day of May 2006.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
for Alan W. Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit SW7060532

City of Elizabeth City — Elizabeth City Airport Apron Expansion
Stormwater Permit No. SW7060532
Pasauotank County
Designer's Certification
I, , as a duly registered in the State of North Carolina,
having been authorized to observe (periodically) weekly/ full time) the construction of the project,
(Project)
for (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.
Noted deviations from approved plans and specification:
SEAL
Signature
Registration Number
Date

Hobbs, Upchurch & Associates, P.A.
Consulting Engineers
14878 US Hwy 17, Suite 5 + Hampstead, NC 28443
July 13, 2007
Mr. Scott Vinson
NCDENR — Division of Water Quality
Washington Regional Office
943 Washington Square Mall
Washington, NC 27889
RE: Elizabeth City Airport Apron Expansion
SW7060532 — As-Builts
Dear Scott:
Please find enclosed the Engineer's Certification and one set of as -built drawings for the above
relerenced stormwater permit.
Please let me know if you need any further information of this project.
Sincerely.
HOBBS, UPCHURCI-1 & ASSOCIATES, P.A.
Jeff "fhompson
Enclosures
,mi_ 162007
Telephone [phone] + Fax [phone] + email; [e-mail]
Southern Pines + Nags Head Charlotte + Beaufort

Jun 01 06 04:24p Hobbs, Upchurch & Assoc.
252-441-2100 p.8
ORIGINAL
City of Elizabeth City — Elizabeth City Airport Apron Expansion
Storrnwater Permit No. SV 7060532
Pasouotank County
Designer's Certification
t, Fred Hobbs, PE , as a duly registered Prof . Engineer in the State of North Carolina,
having been authorized to observe periodically weektpy4ttttti!mt) the construction of the project,
Elizabeth City Airport Apron Expansion (SW7050532)
(Project)
for City of Elizabeth City (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.
Noted deviations from approved plans and specification:
No known deviations from approved plans and specifications.
Signature ae=�'
Registration umber 8983
Date 7-3-2007
SEAL_
JUL 16 2007
®WO -WARD

Jun 01 06 04:24p Hobbs, Upchurch & Assoc.
252-441-2100 p.8
ORIGINAL
City of Elizabeth City — Elizabeth City Airport Apron Expansion
Stormwater Permit No. SV47060532
Paspuotank County
Designer's certification
lFred Hobbs, PE as a duly registered Prof . Engineer in the State of North Carolina,
having been authorized to observe periodically weekly� ftil time) the construction of the project,
Elizabeth City Airport Apron Expansion (SW7060532)
(Project)
for City of Elizabeth City (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.
!Voted deviations from approved plans and specification:
No known deviations from approved plans and specifications.
Signature
Registration um bar 8983
Date 7-3-2007
SEAL
C11, ARS
zsytss
Fp INEF-�'
AFC �10)
JUL 16 20B7
DWO -WAR®

Stormwater Management Narrative
Elizabeth City Airport
Apron Expansion
Pasquotank County
May 24, 2006
Project Description
MAY 2 5 2006
DWQ-WARD
The proposed construction consists of a concrete apron for parking aircraft. The apron is
located on the civil side of the airport and has proposed approximate dimensions of 500' x 200'.
Construction includes only the apron and an associated stormwater network and management
system.
Site Description
The existing property has nearly level topography with slopes generally less than 1 %. Primary
drainage for the project is provided through a network of pipes and inlets which discharge into a
bioretention area. The basin then. discharges back into an existing roadside ditch. This ditch
drains into an unnamed tributary to the Pasquotank River currently classified SB.
Adjacent Property
Land use in the vicinity of the project is commercial/industrial.
Soils
The area is currently covered in patchy grasses. According to the results of a subsurface
investigation, the site typically consists of 0-6 inches of topsoil underlain with approximately 3-6
feet of clay then about 3 feet of silty sand. According to the geotechnical engineer, this silty
sand typically exhibits a permeability of 104 cmis = 0.14 in/hr. Based on a conversation with the
geotechnical engineer, the groundwater in this area is expected to be 4 to 6 feet beneath the
ground surface, which would put it at an elevation of 2-4 feet MSL. However, an existing ditch
(adjacent to the site) was surveyed to have a bottom elevation at or below 2.0 feet. On several
site visits during the winter months, the ditch was dry. Therefore, in design of this bioretention
area, a groundwater depth of 2.0 is assumed. The subsurface investigation by
GeoTechnologies, dated January 23, 2006 is attached.

Stormwater Management
As mentioned earlier, the project site is flat. Stormwater Management for this project requires.
treating the first inch of rainfall. The proposed practice is a bioretention area to be constructed
with a bottom elevation of 3.5' MSL, which is 5.5' below the existing ground elevation. This
bottom elevation was chosen based on the results of the groundwater location and the required
storage needed for treatment. The bioretention Brea will be constructed with 2 feet of planting
soil meeting the specifications attached. Routing of runoff to the basin is done via sheetflow
across the proposed apron.
With the design storm being only 1" of rainfall, bypass of the bioretention basin is provided
through two yard inlet boxes. The rims of the boxes are to be set at 6.75 feet MSL, giving 9
inches of treatment storage in the basin.
The outfall pipe will discharge onto a riprap dissipator pad and then flow through approximately
40 feet of vegetated channel prior to entering the existing roadside ditch. Therefore, bypass
flows also receive benefit of some vegetative filtering.
Design and analysis of the network and system was done with EPA-SWMM (computer
software) utilizing the SWMM RUNOFF method for hydrology and St. Venant's equations for
dynamic hydraulic computations.

i
076* 11' �10.00" 76° '10' - _00" Vy - 76° 09 1 O(Y' W -- -
1
41
. A
i
BOaf /r \
Ramp
. Tidal Floc
Light-
1 A. _ Sp
Brickhouse 47
Point
Seaplane
ROMP
.-z
fAt
ower-- ,'
PROJECT
SITE
-- ,
lot
• li3t .
r
SCALE 1.24000
;♦- 0 - --- 1 MILES
6 ❑ 1000 YARDS
a.
0 1 KILOMETER
11" W ry
076. 11')O.00' W 76. 10' W. 76" 09 00"
Name: ELIZA13ETH CITY Location: 036° 15' 45 46" N 076` 09' 43 14" W
Date: 2/1612006
Scale: 1 inch equals 2000 feet
Copyright (C) 19M. Maptech, Inc.

:Office Use Onl i; ? ,`1 = rr Y
Date Received
Fee Paid
Permit Number
2 z c
O-c
C
State of North Carolina REC P "ED
Department of Environment and Natural Resources I1
Division of Water Quality
MAY 2 5 2006
STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form may he photocopied for use as an original DWO-t��V;�P'q
RO
I. GENERAL INFORMATION
I . Applicants name (specify the name of the corporation, individual, etc. who owns the project):
City_of Elizabeth City
2. Print Owner/Signing Official's name and title (the person who is legally responsible for the facility
and its compliance):
Rich Olson City Manager
3. Mailing Address for person listed in item 2 above:
P.O. Box 347
City: Elizabeth City State: NC Zip: 27907
Telephone Number: 252-338-3981
4. Project Name (subdivision, facility, or establishment name — should be consistent with project name
on plans, specifications, letters, operation and maintenance agreements, etc.):
Elizabeth Ci Airport Apron Exl2ansion
5. Location of Facility (street address):
1028 Consolidated Road
City: Elizabeth City, NC County: Pasquotank
6. Directions to facility (from nearest major intersection):
From the intersection of NC 34 and US I-Iwv 17 in Elizabeth City, head southeast on NC34 for aoDx.
5 miles, then turn left onto Consolidated Road.
7. Latitude: 36 15 11 N Latitude: 76 10 22 W of project.
8. Contact person who can answer questions about the facility:
Name: Jeff Thompson Telephone Number: 910-692-5616
II. PERMIT INFORMATION.
1. Specify whether project is (check one)
® New ❑ Renewal ❑ Modification
Dorm SWU-101 Version 3.99 Page 1 of 4

2. If this application is being submitted as the result of a renewal or modification to an existing permit,
list the existing permit number NIA and its issue date (if known)
3. Specify the type of project (check one):
❑Low Density ®High Density ❑Redevelop ❑General Permit ❑Other
4. Additional Project Requirements (check applicable blanks):
❑ CAMA Major ® Sedimentation/Erosion Control ❑ 404/401 Permit ❑ NPDES Stormwater
III. PROJECT INFORMATION
1. In the space provided below, summarize how ston-nwater will be treated. Also attach a detailed
narrative (one to two pages) describing stormwater management for the project.
All stormwater from this promect will sheet flow to a newly constructed bio-retention area to be
located within the ro'ect's limits.
2. Stormwater runoff from this project drains to the Pasquotank River Basin.
3. Total Project Area: 1 acres 4.Project Built Upon Area: 100 %
5. How many drainage basins does the project have? 1
6. Complete the following information for each drainage basin. If there are more than two drainage
basins in the project, attach an additional sheet with the information for each basin provided in the
same format as below.
Bann Information ;
Draiha e.Basin 1 ,;
' Drama
—Receiving Stream Name
UT to Pas uotank River
Receiving Stream Class
SB
Drainage Basin Area
1.9 acres
Existing Impervious* Area
0
Proposed Impervious* Area
1.9 acres
Impervious* Area (total)
100 %
Impervious* Surface `Area
Drainage Basin 1
Drainage Basin 2-,
On -site Buildin s
On -site Streets
On -site Parking
82000 sf
On -site Sidewalks
Other on -site
Off -site
Total:
82000 sf
Total
Impervious area is defined as the built upon area including, but not limited to, buildings, roads,
parking oreas, sidewalks, gravel areas, etc.
Form SWU-101 Version 3.99 Page 2 of 4

7. How was the off -site impervious area listed above derived? Topographic Survey and Site Visit
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
The following italicized deed restrictions 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.
1. 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 deleted without the consent of the State.
2. 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 necessary to provide driveway crossings.
9. Built -upon area in excess of the permitted amount requires a state stormwater management
permit modification prior to construction.
5. All permitted runoff from 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.
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 (919) 733-
5083 for the status and availability of these forms.
Form SWU-102 Wet Detention Basin Supplement
Norm 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 4

VI. SUBMITTAL REQUIREMENTS
The Division of Water Quality will not accept this application package unless all of the applicable items
are included with the submittal.
1. Please indicate that you have provided the following required information by signing your initials in
the space provided next to each item.
Applicant's Initials
• Original and one copy of the Stormwater Management Permit Application Form
• One copy of the applicable Supplement Form(s) for each BMP
• Permit application process fee of $420 (payable to NCDENR)
• Detailed narrative description of stormwater treatment/management
• Two copies of plans and specifications, including:
- Development/Project name
- Engineer 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 basins delineated
- Vegetated buffers (where required)
VIL A GENT A UTHORM TION
If you wish to designate submittal authority to another individual or firm so that they may provide
information on your behalf, please complete this section:
Designated agent (individual or firm): Jeff Thompson (with Hobbs, Upchurch & Associates, P.A.)
Mailing Address. 300 S.W. Broad Street, P.O. Box 1737
City: Southern Pines State: NC Zip: 28388
Phone: [phone] Fax: [phone]
VI1. APPLICANT'S CERTIFICATION
I, (print or type name of person listed in General Information, item 2) Rich Olson, certify that the
information included on this permit application form is correct, that the project will be constructed in
conformance with the approved plans, that the deed restrictions in accordance with Attachment A of this
form will be e rded all y0ired permit conditions, and that to the best of my knowledge the
proposed prof c ies ith tquirements of 15A 1`ICAC 2H .1000.
Signature: Date:
Form SWU-101 Version 3.99 Page 4 of4

Permit No.
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
(to be provided by DWQ)
STORMWATER MANAGEMENT PERMIT APPLICATION FORMRECEIVED
BIORETENTION AREA SUPPLEMENT MAY 2 5 2006
DWQ Stormwater Management Plan Review: DWO—WAR®
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 and system details.
1. PROJECT INFORMATION
Project Name: E i toa{oe +L. r i 4. 14"tAopt Oorn✓l _J2Ja&'Si0 ✓1
Contact Person: -$ "Thorn 0 'F Phone Number; 4 10 6 Q a -„ s 616
For projects with multiple basins, specify which basin this worksheet applies to:
II. 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).
Soils Report Summary rr
In -Situ Sol] Type
In -Situ Soil Infiltration Rate p, I�i in./hr. (the most restrictive soil layer)
SHWT Elevation, p ft. (Seasonal High Water Table elevation)
Planting Soil Texture -SLmp (must be a sandy loam, loamy sand, or loam texture)
Planting Soil Infiltration Rate � in./hr. (estimated)
Basin Design Parameters
Drainage Area
Impervious Area
Design Storm
Design Volume
Inlet Velocity
Inlet flow depth
Drawdown Time
Basin Dimensions
Basin Size
Basin Volume Provided
Basin Elevations
Temporary Pool Elevation
Planting Elevation
Bottom Elevation
92.013, sq.1t. (on -site and off -site drainage to the basin)
o(0 11 sq.1t. (on -site and off -,rite drainage to the basin)
1, O inch (1.5 inch event for SA waters, 1 inch event for others)
6 $ 3 q c.f. (storage volume required)
0.2a fps
0. -7T inch
/. S days
y 3 ft. x. oZ ft. _ CT 1 S I sq. ft. (surface area at basin bottom)
G86g c.f.
fo. oZ s fmsl (elevation of the bypass/outlet .structure)
.�• fmsl (elev(ition of the ground sulfrzce bottom)
.3. fmsl (elevation of the bottom of the planting media)
Page ] of 3

Ill. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach an 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
a. No vertical sand bed is proposed.
b. The bioretention area is at least 40 feet by 15 feet.
c. Sheet flow is provided at inlet.
d. A grass buffer strip is provided at the inlet of the bioretention area.
un,larit-oay, e. Seasonal High Water table depth is at least 2 feet from bottom of planting media.
—� f. Ponding depth of 6-9" is provided.
atA,✓► g. The in -situ soil infiltration rate is greater than 0.52 inihr.
h. The planting soil infiltration rate is greater than 0.52 in/hr.
i. The ponded area will draw down in less than 5 days. (calculations attached)
J. Planting soil meets minimum soil specifications (NCDENR Stormwater Best
Management Practices Manual, April 1999)
k. A planting schedule with species and densities is provided on plans.
0- 1. Mulch layer and depth is specified on plans.
m. Plan details for the bioretention area are provided. (including dimensions and elevations)
n. Plan details for the inlet and outlet are provided.
o.. An operation and maintenance agreement signed and notarized by the responsible party is provided.
This system (check one) Xdoes ❑ does not incorporate the use of an under -drain.
IV. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Maintenance activities shall be performed as follows:
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.
2. Repair eroded areas immediately, re -seed and re -mulch as necessary to maintain good vegetative and mulch cover.
3. Remove accumulated sediment and old mulch as needed to maintain good infiltration. Replace, or add additional
mulch as needed. Removal of the old mulch layer before applying the new layer is recommended every 2 to 3 years.
Page 2 of 3

4. Prune trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in height.
5. 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 of toxins in the planting media. Lime
or other alkaline substances shall be applied as recommended per the soil 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 signature below that I am responsible for the performance of the eight maintenance
procedures listed above. I agree to notify DWU of any problems with the system or prior to any changes to the system or
responsible party.
Print name
Title:
Address: _
Phone
Signa
Date:
' j OCc- -\
n
PD! 9.x i54) IP-A-4f,YYI r1It' '�, IUL 17907
Note: The legally responsible party should not be a homeowners association unless more than 50%of the lots have been sold and a resident of the
'V subdivision has beee—nn� mm�rxi die president.
Al
I, J / Q /7 �l1. li I 1 C a Notary Public fg he State of C- ,
County of t t7 tlf , do hereby certify th�t IC _ L � S
personally appeared efore me this day of AmIll_.;ZLDw_, and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official seal,
// , r74
A/X,
SEAL
My commission expires lt/ ��,(�'i "SAC 0(n'
Page 3 of 3

/0
,- r"n 0 f m 9 --N ( -_