HomeMy WebLinkAboutSW7070411_CURRENT PERMIT_20070618STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
DOC TYPE
CURRENT PERMIT
APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYM M D D
ViDIP16.
h6ichwl F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleen H. Sullins, Director
Division of Water Quality
June 18, 2007
Ms. Barbara Hill, Chair of Board
Knotts Island Volunteer Fire Department, Inc.
P.O. Box 115
Knotts Island, NC 27950
Subject: Permit No. SW7070411
Knotts Island Volunteer Fire Department
High Density Stormwater Project
Currituck County
Dear Ms. Hill:
The Washington Regional Office received a completed Stormwater Application for the subject project on
June 14, 2007. 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. SW7070411
dated June 18, 2007 to the Knotts Island Volunteer Fire Department, Inc. for the construction and operation of a wet
detention pond to serve the proposed Knotts Island Volunteer Fire Department located at the intersection of NC Hwy
615 and Bufflehead Court in Knotts Island, NC.
This permit shall be effective from the date of issuance until June 18, 2017 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 forth of a written petition, conforming to Chapter 150E of the North Carolina General Statutes,
and filed with the Office of Administrative Hearings, 6714 Mail Service Center, Raleigh, NC 27699-6714. 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 me at (252) 946-6481.
incerely
AI Hodge, egR final Supervisor
Surface Water Protection Section
Washington Regional Office
cc: Hyman & Robey, PC
Currituck County Inspections
,k ashington Regional Office
Central Files
North Carolina Division of Water Quality Internet: www.ncwmeraualitv,ore
943 Washington Square Mall Phone (252) 946-6481
Washington, NC 27889 Far (252) 946-9215
Nne
orthCarolma
Naturally
An Equal OpportunitylAFirmative Action Employer - 50% Recyded110% Post Consumer Paper
State Stormwater Management Systems
Permit No. SW7070411
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
Knotts Island Volunteer Fire Department, Inc.
Currituck 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 a wet detention pond to serve the proposed Knotts Island Volunteer
Fire Department located at the intersection of NC Hwy 615 and Buf lehead Court in Knotts Island, NC.
This permit shall be effective from the date of issuance until June 18, 2017 and shall be subject to the following
specified conditions and limitations:
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
2 of this permit, the Project Data Sheet.
3. A maximum of 68,729 square feet of built upon area is allowed on this 9.72 acre site.
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 approved plans.
5. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of
the permit.
DIVISION OF WATER QUALITY
PROJECT DATA
Project Name:
Knotts Island Volunteer Fire Department
Permit Number:
SW7070411
Location:
Currituck County
Applicant:
Knotts Island Volunteer Fire Department, Inc.
Mailing Address:
P.O. Box 115
Knotts Island, NC 27950
Application Date:
4/17/2007 (original)
Receiving Stream:
UT to North Landing River
Classification of Water Body:
C-SWP
Total Site Area:
9.72 ac
Drainage Area to Basin:
3.58 ac
Total Impervious:
1.57 ac
Pond Depth:
5.0 feet
Required Storage Volume:
5,784 cf
Provided Storage Volume:
7,442 cf
Required Surface Area:
4,132 sf
Provided Surface Area:
9,925 sf
Controlling Orifice:
1.5 in @ elev. 7.5 ft
6. 'No homeownergot 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.
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
a., 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.
8. 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:
a. Semiannual 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, theapproved 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.
A copy of the approved plans and specifications shall be maintained on file by the Permittee for the fife of the
project.
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.
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. The Permittee, at least six (6) months prior to the expiration of this permit, shall submit in writing a request for
an extension along with appropriate application fee.
Permit issued this the 18 th day of June, 2007.
ENVIRONMENTAL MANAGEMENT COMMISSION
.* Coleen H. Sullins Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number SW7070411
Knotts Island Volunteer Fire Department - Currituck County
Stormwater Permit No. SW7070411
Designer's Certification
1, 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,
(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.
Signature
Registration Number
Date
Certification Requirements:
_1. The drainage area to the system contains approximately the permitted acreage.
_2. The drainage area to the system contains no more than the permitted amount of built -upon area.
3. All the built -upon area associated with the project is graded such that the runoff drains to the
system.
_4. All roof drains are located such that the runoff is directed into the system.
_5. The outlet/bypass structure elevations are per the approved plan.
6. The outlet structure is located per the approved plans.
7. Trash rack is provided on the outlet/bypass structure.
B. All slopes are grassed with permanent vegetation and are no steeper than 3:1.
9. The inlets are located per the approved plans and do not cause short-circuiting of the system.
_10. The permitted amounts of surface area and/or volume have been provided.
11. All required design depths are provided.
_12. Required drawdown devices are correctly sized per the approved plans.
_13. All required parts of the system are provided, such as a vegetated shelf, forebay and vegetated
.filter if required.
_14. The required system dimensions are provided per the approved plans.
I
Slate of North Carolina 5 "v /�-F" yrr7r v7
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FO ECEIVE®
This form may be photocopied for use as an original t�
GENERAL INFORMATION JUN 1!4 20Jl
I. Applicants name (specify the name of the corporation, individual, etc. who owns the prcject):DWQ-WAR®
I
Knotts Island Vo1n tPPr Fira._i2epartment_,_�nc _.
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Barbara Hill, Chair of the Board Knotts Island Fire Depar -n-t nc,
3. Mailing Address for person listed in item 2 above:
P.O. Box 115
Knotts Island State: NC
phone Number: ( 75.7) 202-9703
i
9. Project Name (subdivision, facility, or establishment name - should be consistent wide project name on �p1m IS,
specifications, letters, operation and maintenance agreements, etc.):
Knotts Island Fire Station
5. Location of Project (su'ecl address):
Corner of NC 615 and Bufflehead Court
City: Knotts Island County: Currituck
6. Directions to project (from ncarest major intersection):
Project is-10catP sb-u- h of the—rnteeseetic
NC,615 and SR 1255 on NC 615
7. Latitude: 750 55' Longitude: 360 30' of project
8. Contact person who can answer questions about the project
Name: Kim Hamby Telephone Number: ( 252 ) 335-188
II. PERMIT INFORMATION:
1. Specify whether project is (check one): XX New Renewal Modification
FormSWU-101 Version3.99. Page Iof4
2. If this applicaLiun Is being submitted; s the result of rencwol ur iuudil Ito to:in existlnt; pull iit, IIs( the
eXistinf; permit number —_---------_ __-- end tS issue ([Zile (if
3. Specify Ow type of project (clicck one):
_Lew Density _ XX hligh Density _—___I2udevcloll ______Ccncril Permit ____Other
4. Additional Project Rcquire.mcnts (cltecle applicable blanks):
_GAMA Major XXSeciiinentation/Frusion Conlrul _404/401 Permit _NPDI:S SlurnlwaLel
Infuiutn(iun on rc:rluired Sl:tte permits can be ublaiimd by contacting du: Custoumr Sci vice Center nt
1-877-62.3-674 S.
Ill. PROJFCT INFORMATION
I. In the space provided below, Swiuuarirc haw scorn nvatcr will be Ucatcd. Also attach it detailed narrdive
(una to two pal;as) ,Icseribiul; stunnnev:d cr iiiniial,gnic lit far the Ill ojccl .
Stormwater will sheet flow to grass lined swa3es, and an underground_
drainage system that are rerouted to a wet detention basin desi_gnedfor
------..._...I--- _._....__.._ .. — _ ....
90% TSS removal.
2. Sturniwater runoff from this projccl drains Iv llu; Pasquo tank River basin.
3. 'I'oiul I'injecl Arco: 9. 72na cs 4. Piojccl 13toll Upon Arca:_.1.6_...3_7 'X
5. How i,,;illy (Irainage areas dues (be, projccl Iervr,72 _
G. Complete Uic following information fur each dralnagc area. If shoe at "um: than Iwo (11tin:lgc areas ill the
project, attach an adclilional Sheet will Iho infor"mLion fur each area provided in the S:mic format as below.
Basin Intbrtuation
Drainage At I
Draioagu Area 2
ReceivingSlreamNatnc
North Landing River
North landingl31_v_or
Receiving Stream Class
CSW
CSW
Drainage At
3.58 AC
_6 _1 4
FXisting Impervious' Arca
0
0 --
Pioposallu,pcivious'Aica
1.57 AC
0
Yv Impei vioris' Arca (total)
44%
Lnpei viuus' Sol facc Area
Drainage At I
Ui itin,il;o Area 2
— -- - —
On-s-situ Buildiol;s --
On -site Sit COS
--
On-SItePilIki"g
1.18AC 51,45 sF)
On-siLc Sidewalks
0.02 AC (1 , 051SF)
_
Ot""""Le dumpster
0.02 AC_(_� 7 3S.E)
_
CMk*1Y,X and tank
TutaC 1.57 AC (68,729
jTl":
Impel vious area is defined as (he built upon area including, but uo( limited to, buildings, roads, ptulting at eas.
sidc;r:illts, gravel aloes, etc.
Perm SWU-101 Vcrsioa 3.99 P;Ij'C 2 W'I
7. How was the off -site impervious area listed above derived? ���p p��,3 p Big
1V. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
The following italicized deed restrictions and protective covenants are required to be recorded for all
subdivisions, outpaicels and future development prior to [lie sale of any lot. if lot sizes vaiy significantly, a table
listing each lot number, size and the allowable built -upon area fur each lot must be provided as an attachment.
1. The following covenants are intended to ensm e ongoing compliance will, slate slot nnveler management permit number
as issued by [he Division of 11'aler Quality. 7,11lse c'ovenanls may no[ be
changed or deleted without the consent of file Slate.
2. No moc than square feel of any lot shall be covered by sir uclures or impervious nreter'ials.
Impervious materials![)elude asphalt, grrwel, ele, Inif:k, static, ,slurp of simil;n lowelial burl do no inrlmde wood
decking or We water surface ofswinmning pools.
3. Swales shall no[ be filled in, piped, or filleted except as necessmy to provide driveway crossings.
4. Built -upon area in excess of [lie peimilled amount requires a slate slor'nlwa[er management pernnit modification prior to
construction.
5. All permitted runoff hom oulparcels or future development shall be directed into the permittedslorunvatercontrol
System. These connections to life storm water coftrul system shall be per'fonned in a mannerthat maintains the integrity
and performance of the .system as pei nd f led.
13y your signature below, you certify that die recorded deed restrictions zinc] protective covenants for this project
shall include all the applicable i[ems required above, that the covenants will be binding on all parties and persons
claiming under them, that they will run with Lim land, that life required covenants cannot be changed or deleted
Without concurrence G'our [he Statc, and that they will be recorded pr for to the sale of any lot.
V. SUPPLEMENT FORMS
-file applicable state stornnvatcr management permit supplement forin(s) listed below [)rust be submitted for each
BMP specified for this project. Contact file Slorinwatei and General Permits Unit at (919) 733-5083 for the status
and availability of these forms.
Form SWU-102
Wet Dclenllon Basin Supplement
Form SWU-103
Iufll Lratiun Basin Supplement
Pori[) SWU-104
Low Density Suppleuimrt
Form SWU-105
Curb Outlet System Supplement
Forrn SWU-Ioc
Off-Si[e System Supplement
Form SWU-107
Underground IfIflllrallorl Tl'@nch Supplement
Form SWU-108
Neuse River Basin Supplement
Form SWU-109
hmovative Best Management Practice Supplement
Form SWU-101 Version 3.99 Page 3 u f 4
VI. SUBMI'I-I'Al. RGQUIRBrv4LN'I'S
Only complete applic:niun packages will be accepted and reviewed by the Division or Water Quality (DWQ).
A corplete package includes all of the items listed below. 'file complete application package should be
submitted to the appropriate DWQ Regional Office.
Please indicate that you have provided the t,oilowing requil ccl Inforruation by initialing In the space provided
next to each item.
Initials
• Original and one copy of [lie Slormwater Management Permit Application Form
• One copy of the applicable Supplement Form(s) for each BMP
• Permit application processing fee of $420 (payable to NCDENR) _
• Detailed narrative description of stormwater beatnient/management _
• Two copies of plans and specifications, including:
Devclopmcin/hoject name
- Eligincer and I-irm
Legend
- North arrow
- Scale
- Revision number & date
- Mean high water line
- Diurensiuued properly/project houudmy
- Location rump with named streets or NCSR numbers
- Original contours, proposed contours, spot cicvakons, finished (loot elevations
- Dctails ohoads, drainage features, collection systems, and sLorrnwater control measures
- Wetlands delineated, or a note on plans that none exist
- Existing drainage (including oft -site), drainage easements, pipe sizes, runoff calculations
- Drainage areas delineated
- Vegetated buffers (where required)
VIL AGEN'TAUCI-IORIZATION
If you wish to designate authority to another individual or firm so that they may provide information on your
behalf, please complete this section.
Designated agent (individual or firm): Hyman & Robey, r PC
Mailing Address: P.O. Box 339
City: Camden
Phony ( 252 ) 335-1888
VIII. APPLICANT'S CERTIFICATION
State: NC
27921
Pax: ( 2 5 2)3 5552 _
1,(pint a' type nameofpcisonlistedioGeneral lnforutation,Rent 2) Barbara Hill
certify that the infol nation included on this permit application form is, to the best of my knowledge, correct and
that the project will be constucLed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, an I that tyro proposed project complies with the requirements of I5A
NCAC 21-I .1000. n
Date:D /U
Point SWU-101 Version 3.99 Page of 4
Permit No.
(to be provided by DFVO_)
Stale of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original
DWO Stormwater Management Plan Review:
A complete stormwater management plan submittal includes an application form, a wet detention basin
supplement for each basin, design calculations, and plans and specifications showing all basin and outlet
structure details.
1. PROJECT INFORMATION
Project Name: Knotts Island Fire Station
Contact Person: Barbara Hill Phone Number: 757) 202-9703
For projects with multiple basins, specify which basin this worksheet applies to:
elevations
Basin Bottom Elevation 2 50 R.
Permanent Pool Elevation 7 . 50 R.
Temporary Pool Elevation 8.20 ft.
areas
Permanent Pool Surface Area 9 , 925 sq. ft.
Drainage Area 3.58 ac.
Impervious Area
volumes
Permanent Pool Volume
Temporary Pool Volume
Forebay Volume
Other parameters
SA/DAI
Diameter of Orifice
Design Rainfall
Design TSS Removal 2
Form SWU-102 Rev 3.99
1.57 ac.
(flow of the basin)
(elevation of the orifice)
(elevation of the discharge structure overflow)
(water surface area cu the oryiee elevation)
(on -.site and off -site drainage to the basin)
(on -site and off -site drainage to the basin)
21,641 cu. ft. (combined volume of main basin and forebay)
7,442 Cu. ft. (Folrune detained above the permanent pool)
4,572 cu. ft. (approximately 20% of total volume)
3.2 (surface area to drainage area ratio from DWQ table)
1.5 in. (2 to S clay temporary pool draw -down required)
1 In (10 yr. storm)
90 % (miniunon 85010 required)
Page 1 of 4
Footnotes:
When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon the
actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for non-
standard table entries.
2 In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide
9o%TSS removal. The NCDENR BNIP manual provides design tables for both 85%TSS removal and 90%TSS removal.
11. 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 1999) and Administrative Code
Section: 15 A NCAC 2H .1008.
Initial in the space provided to indicate 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. If a requirement has not been met, attach justification.
Applicants Initials
a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
b. The forebay volume is approximately equal to 20% of the basin volume.
c. The temporary pool controls runoff from the design storm event.
d. The temporary pool draws down in 2 to 5 days.
XXXXXXXXXX e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow
calculations)
f. The basin length to width ratio is greater than 3:1.
g. The basin side slopes above the permanent pool are no steeper than 3:1.
h. A submerged and vegetated perinlctm' shelf with a slope of 6:1 or less (show detail).
i. Vegetative cover above the permanent pool elevation is specified.
j. A trash rack or similar device is provided for both the overflow and orifice.
XXXXXXXXXX k. A recorded drainage easement is provided for each basin including access to nearest right-
of-way.
I. If the basin is used for sediment and erosion control during construction, clean out of the
basin is specified prior to use as a wet detention basin.
in. A mechanism is specified which will drain the basin for maintenance or an emergency.
(pump)
III. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the
vegetated filter if one is provided.
This system (check one) 0 does Xtkdoes not incorporate a vegetated filter at the outlet.
This system (check one)XQ does 0 does not incorporate pretreatment other than a forebay.
Fonn SWU-102 Rev 3.99 Page 2 of4
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative
cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swalcs, riprap, etc.) quarterly to maintain
proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of
in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e.
stockpiling near a wet detention basin or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads 3 . 75 feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads 2 . 25 feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
Ull in the blonks)
Permanent Pool Elevation 7.50
Sediment Ren oval El. 5 . 2 5 75 a
----------�/-- % Sediment Removal Elevation 3. 75 75%
Bottom El c •anon 4 . 50 ---------------------------------
-------------
13onom Elevation 2.50 - 25% /
FOREBAY MAIN POND
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through
the emergency drain shall be minimized to the maximum extent practical.
Fonu SWU-102 Rev 3.99 Page 3 of 4
All components of the wet detention basin 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 seven
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any
changes to the system or responsible party.
Printname:_ Ra Yhara Rill
Title: Chair of the Board
Address: P 0 Box 115 Knotts Island, NC 27950
Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a
resident of the subdivision has been named the president.
1, / i lG ru al I hair—+ , a Notary Public for the State of NO r4-k Caral n
County of de-n do hereby certify that &Lc / _ R • 14,11
personally appeared before me this � day ofrt ,g Q0 %, and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal,
yy(-""3 A A��
SEAL
My commission expires /oy
Form SWU-102 Rev 3.99 Page 4 of 4