SW8000720_CURRENT PERMIT_20000921

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. I
DOC TYPE n CURRENT PERMIT
APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYM M D D

State of North Carolina
Department of Environment
and Natural Resources
\Vilmincton Regional Office
.lames B. Hunt, Jr., Governor
Bill Holman, Secretary
Division of Water Qualiry
September 21, 2000
Pastor 1onathan Blackburn
Cornerstone Baptist Church
2.730 NorthChase Parkway, SE
WilIII iil(MOn, NC 28405
Subject: Permit No. SV18 000720
Cornerstone Baptist Church
High Density Storinwater Project
New Hanover County
Dear Pastor Blackburn:
The Wilniin4,tonRe ionalOfi=icereceivedacompleteSton-nwaterManagementPermitApplicationforCornerstone
13�iptist Church on September 20. 2000. Staff review of the plans and specifications has determined that the project;
as proposed. will comply- with the Storn-twater Regulations set forth in Title 15A NCAC 2H.1000. We are
forwarding Permit No. SW8 000720 dated September 21. 2000_ for the construction of Cornerstone Baptist Church.
This permit shall be effective from the date of issuance until September 21, 2010, and shall be subject to the
conditions and lunitations 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
nianaocment system will result in future compliance problems.
If any pans; requirements, or limitations contained in this permit are unacceptable, you have the right to request an
adj udicatory hearing upon written request within thirty (30) days fo] lowing receipt ofthis 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 I-learings, P.O. Drawer 27447, R ilei(-,h, NC 2761 1-7447. Unless such demands
are made this permit shall be final and bindin�l..
If you have any questions, or need additional information concerning this matter, please contact Scott Vinson, or
me at (910) 39-5-3900.
Sincerely,
1 �•
Rick Shiver
% ater Quality Regional Supervisor
16/sav: S:1WQSISTORMWATIPERMIT1000720.SEP
cc: ,IoeSinith. P.E.
Tonv Roberts. New Hanover County Inspections
Beth Easiev. New Hanover County Enaineerim-,
Scott Vinson r v
Wilmincton ReLional Office
Central Files v
127 Cardinal Dr. Ext., Wilmington, north Carolina 28405 I'del►hone 910-39S-3900 FAX [phone]
An rclua) Opportunit.• Affirmative Action Linnlover fl;'„ recvcledli0°S, nost-consumer uane.•

State Stormwater Management Systems
Permit No. SW8 000720
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
Cornerstone Baptist Church
Cornerstone Baptist Church
New Hanover County
FOR THE
construction, operation and maintenance of a wet detention pond in compliance with the provisions of 1 SA NCAC
2H .1000 (hereafter referred to as the "stormwater rifles) 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 Qualitv
and considered a part of this permit.
This permit shall be effective from the date of issuance until September 21, 2010 and shall be subject to the
following specified conditions and limitations:
1. 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 tine rnanatiement of stormwater runoff as described on page
of this permit, the Project Data Sheet. The stormwater control has been designed to handle the runoff from
54,130 square feet of impervious area.
3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts
of the permit.
4. The tract will be limited to the amount of built -upon area indicated on page 3 of this permit, and per
approved plans. 4

State Stormwater Management Systems
Permit No. Su78 000720
DIVISION OF WATER QUALITY
PROJECT DESIGN DATA SHEET
P1ect Name: Cornerstone Baptist Church
Permit Number: SW8 000720
Loclation: New Hanover County
Applicant: Pastor Jonathan Blackburn
N,lailing Address: Cornerstone Baptist Church
2730 NorthChase Parkway, SE
Wilmington, NC 28405
Application Date: September 20, 2000
Name of Receiving Stream/Index 4: Smith Creek / 18-74-63
Classification of Water Body: "C Sw"
If Class SA, chloride sampling results: n/a
Pond Depth, feet: 4.10
Permanent Pool Elevation, FMSL:f 46.90
Drat I ge Area, acres: 3.00
Total Impervious Surfaces, ft': 54,130
Buildings, ft2: 10,790
Parking; ftz: 41,340
Sidewalks, ft2: 2,000
Offsite Area entering Pond, ftz: none, per Engineer
Required Surface Area. ft2: 4,613
Provided Surface Area; ft'-: 4,620
RecluuIed Storage Volume, fl3: 4.604
Provided Storage Volume, ft3: 57662
Temporary Storage Elevation, FMSL: 48.00
Controlling Orifice: 1.00" (� pipe

State Stormwater Management Systems
Permit No. SW8 000720
11, SCHEDULE OF COMPLIANCE
The stormwater management system shall be constructed in it's entirety, vegetated and operational for its
intended use prior to the construction of any built -upon surface.
?. During construction. erosion shall be kept to a minimum and any eroded areas of the system will be repaired
immediately.
3. 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 flan 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 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.
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 DWG). The records will indicate the date, activity, name of person performing the work and what actions
were taken.
Decorative spray fountains will not be allowed in the stormwater treatment system.
6. The facilities shall be constructed as shown on the approved plans. 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.
7. 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
spec if ions must be noted on the Certification.
1 f the stornwater 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.
9. 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.
C. Further subdivision, acquisition, or sale of the project area. The project area is defined as all property
owned by the permittee, for which Sedimentation and Erosion Control Plan approval was sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan.
10. The Director may determine that other revisions to the project should require a modification to the permit.
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.
2

State Stormwater Management Systems
Permit No. SW8 000720
12. Prior to the sale of any. portion of the property, an access/maintenance easement to the stormwater facilities
shall be granted in favor of the permitiee if access to the stormwater facilities will be restricted by the sale
of any portion of the property.
13. The permittee is responsible for verifying that the proposed built -upon area does not exceed the allowable
built -upon area.
14. The runoff from all built -upon area on the project must be directed into the permitted stormwater control
system.
15. The Director may notify the permittee when the permitted site does not meet one or more of the minimum
requirements ofthe permit. '\Nlithin 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 chances have been made.
16. The permittee shall notify the Division of any mailing address changes within 30 days.
lll. GENERAL CONDITIONS
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 max, 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
143-215.6A to 143-215.6C.
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.
The permittee grants DENR Staff permission to enter the property 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.
7. 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 Desig,n Manual.
Permit issued this the 21 st day of September, 2000.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
f
Kerr T. Stevens. Director '
i Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number SW8 000720
5

State Storm�vater Management Systems
Permit No. S'W8 000720
Cornerstone Baptist Church
Stormwater Permit No. SWS 000720
New Hanover County
Designer's Certification
Page 1 of 2
as a duly registered in
the State of North Carolina, having been authorized to observe (periodically/weekly/full time) the construction of
the project,
(Pre j ect)
for (Project Owner) hereby statethat, 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.
The checklist of items on page 2 of this form is included in the Certification.
Noted deviations from approved plans and specification:
Signature
Registration Number
Date
SEAL
,n

Cornerstone Baptist Church
Stormwater Permit No, SW8 000720
New Hanover County
Certification Requirements:
State Stormwater Management Systems
Permit No. SW8 000720
Page 2 of 2
l . 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. The outlet/bypass structure elevations are per the approved plan.
5. The outlet structure is located per the approved plans.
6. Trash rack is provided on the outlet/bypass structure.
7. All slopes are grassed with permanent vegetation.
8. Vegetated slopes 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.
H . Required drawdown devices are correctly sized per the approved plans.
12. All required design depths are provided.
13. All required parts of the system are provided, such as a vegetated shelf, and a forebay.
14. The overall dimensions of the system, as shown on the approved plans, are provided.
cc: NCDENR-DWQ Regional Office
Tony Roberts, New Hanover County Building Inspector
7

.'_' , :QIICE::iTSE;ONC Y yr Fap
" ,; 'f ` 'ar
Date Received
Fee Paid
Permit Number
icy
pp
.Z
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
Cornerstone Baptist Church
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Jon Blackburn
3. Mailing Address for person listed in item 2 above:
City: Wilmington State: NC Zip: 28405
Telephone Number: f 910 1 343-9552
4.
Project Name (subdivision, facility, or establishment name - should be consistent with project name on
plans, specifications, letters, operation and maintenance agreements, etc.):
Cornerstone Ba ti_ isL Church
5. Location of Project (street address):
2730 Northchase Pkwy SE
City: Wilmington County: New Hanover
6. Directions to project (from nearest major intersection):
Approximately 1 mile north of the Murryville intersection.
7. Latitude: 340 18' Longitude: 770 52 ' of project
8. Contact person who can answer questions about the project:
Name: Jon Blackburn Telephone Number: (910 ) 343-9552
II. PERMIT INFORMATION:
1. Specify whether project is (check one): X New Renewal Modification
Form 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 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 NPDES Stormwater
Information on required state permits can be obtained by contacting the Customer Service Center at
1-877-623-674&
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 will be treated by routing it through a wet detention pond.
North East
2. Stormwater runoff from this project drains to the Cape Fear River basin.
3. - Total Project Area: 3.0 acres 4. Project Built Upon Area: 41 %
5. How many drainage areas does the project have? 1
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.
{ _ _ - f
Basin Information `
F;x.• •�; ^atw;:t+.a.,: a __ms, «'�
., ^C Ta S �Akk a�i 3 G
' Drainage Area;{1 �:
.. xxss:,.,cc�. :.i 3srrotta^nr'u<ar o-:kr
\ 1 yfk P A y
Draina Axea
a ,;, E.»xk�Cw
Receiving Stream Name
Smith Creek
Receiving Stream Class
Drainage Area
3.0
Existing Impervious* Area
35,390 s.f.
Pro osed Irn ervious}Area
18,740 s. f .
% Impervious* Area (total)
41 %
�' y $tr t * z ss^.:r: k)k S-: - x
rrtcvious SurfaceAxea ��Drainage
r 3 .w�, xwcRar�. Y r '�`
Area 1 £
z c 3 "�% x '?
#, <, Drainage Area{2
<. w .
On -site Buildings
10,790 s. f.
On -site Streets
On -site Parking
41,340 s. f .
On -site Sidewalks
2,000 s. f .
Other on -site
Off -site
Total: 54,130 s. f .
Total:
Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
Form SWIG-101 Version 3.99 Page 2 of 4

7. How was the off -site impervious area listed above derived? N/A
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.
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.
4. 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.
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 4

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 initialing in the space
provided next to each item.
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 processing 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 areas delineated
- Vegetated buffers (where required)
VI1. AGENT AUTHORIZATION
If you wish to designate authority to another individual or firm so that they may provide information on your
behalf, please complete this section.
r • • • . • • ��ii� i/ naia�'_ �� ► ��� (.. ���.l1fJ/a/7E%i�1
Mailing f �
Address:
� Zip/
VII1. APPLICANT'S CERTIFICATION
I, (print or type name of person listed in General Information, item 2) -0
certify that the information included on this permit application f 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 recorded, and that the proposed project complies with the requirements of 15A
NCAC 2H .1000__--7 /1 . /%
Signatun
Date:
Form SWU-101 Version 3.99 Page 4 of 4

Pen -nit No.
(to be provided by DWQ)
State 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
DWQ 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.
I. PROJECT INFORMATION
Project Name: Cornerstone Rapt-i st Churrb_
Contact Person: Tnn Blackburn Phone Number: ( q1 n ) 343_asK-)
For projects with multiple basins, specify which basin this worksheet applies to:
elevations
Basin Bottom Elevation ft.
Permanent Pool Elevation 46.9 ft.
Temporary Pool Elevation 48.0 ft.
areas
Permanent Pool Surface Area— F 620 sq. ft.
Drainage Area 3.00 ac.
Impervious Area
volumes
Permanent Pool Volume
Temporary Pool Volume
Forebay Volume
Other parameters
SA/DA 1
Diameter of Orifice
Design Rainfall
Design TSS Removal 2
1 _ 24ac.
(floor of the basin)
(elevation of the orifice)
(elevation of the discharge structure overflow)
(water surface area at the orifice elevation)
(on -site and off -site drainage to the basin)
(on -site and off -site drainage to the basin)
6,950 cu. ft. (combined volume of main basin and forebay)
5,724 cu. ft. (volume detained above the permanent pool)
2. SO[1 cu. ft. (approximately 20% of total volume)
3.53
1 in
in.
90 %
(surface area to drainage area ratio from DWQ table)
(2 to S day temporary pool draw -down required)
(minimum 85% required)
1 orm SWU-102 12ev 3.99 Page 1 of 4

Footnotes:
When using the Division SAMA tables, the correct SAIDA 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.
In the 20 coastal counties, the requirement for a vegetative Filter may be waived if the wet detention basin is.designed to provide
90% TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal.
II. 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.
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 perimeter 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.
k. A recorded drainage easement is provided for each basin including access to nearest right-
of-way.
1. 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.
m. A mechanism is specified which will drain the basin for maintenance or an emergency.
11I. 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 Rdoes not incorporate a vegetated filter at the outlet.
This system (check one) 0 does Kdoes not incorporate pretreatment other than a forebay.
Form SWU-IO2 Rev 3.99 Paoe 2 of 4

Footnotes:
I When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing shou ld-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
90% TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal.
II. 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.
0
c
The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
The forebay volume is approximately equal to 20% of the basin volume.
The temporary pool controls runoff from the design storm event.
d. The temporary pool draws down in 2 to 5 days.
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 perimeter shelf with a slope of 6:1 or less (show detail).
i. Vegetative cover above the permanent pool elevation is specified.
J.
K.
A trash rack or similar device is provided for both the overflow and orifice.
A recorded drainage easement is provided for each basin including access to nearest right-
of-way.
1. 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.
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 Akdoes not incorporate a vegetated filter at the outlet.
This system (check one) ID does 0 does not incorporate pretreatment other than a forebay.
Form SWU-102 Rev 3.99 Page 2 of 4

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, swales, 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 feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads 3 feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
{fill in the blanks}
Permanent Pool Elevation 46.9
Sediment Re oval El. 43,E 75 0
------- - Sediment Removal Elevation 43.9 75%
Bottom Ele ation 42.9 qo---- -Sediment
Bottom Elevation 42.9 . ___--1-25%
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.
Form SWU-102 Rev 3.99 Page 3 of 4

7. All components of the wet detention basin system shall be maintained in good working order.
I acknowledge and agree by my signature below that l am responsible for the performance of the seven
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any
changes to the system or responsible party.
Print name: tiro r, a iiA Z( n -81 C k h L
Title: P_ fY7iytyj"� ��a.ca ��ft��
Address:
Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and
a resident of the subdivision has been named the president.
I, Alg /) 0- y _k /D u1 i etZ—_ —,a Notary Public for the State of
County of IVet.t1 ] o ✓9A-1 , do hereby certify that _o n s'm o n
personally appeared before me this -1 day of 000 , and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal,
p�lF�
* �10TliP►,•
aC —O-4 U
m� PUBLI
SEAL
My commission expires D 5/04102- '
Form S W U-102 Rev 3.99 Page 4 of 4