HomeMy WebLinkAboutSW8021029_CURRENT PERMIT_20030205STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW�/yJt�"/
DOC TYPE
� CURRENT PERMIT
APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
Wilmington Regional Office
February 5, 2003
Mr. Michael A. Kahn, Manager
Makwen Development Company, LLC
5417 Wyoming Drive
Charlotte, NC 28273
Subject: Permit No. SW8 021029
Empire Distributors Site
High Density Stonnwater Project
New Hanover County
Dear Mr. Kahn:
The Wilmington Regional Office received a complete Stormwater Management Permit
Application for Empire Distributors Site on January 29, 2003. - Staff review of the plans and
specifications has determined that the project, as proposed, will comply with the Stormwater
Regulations set forth in Title 15A NCAC 2H.1000. We are forwarding Permit No. SW8 021029
dated February 5, 2003, for the construction of Empire Distributors Site.
This permit shall be effective from the date of issuance until February 5, 2013, and shall be
subject to the conditions and limitations as specified therein. Please pay special attention to the
Operation and Maintenance requirements in this permit. Failure to establish an adequate system
for operation and maintenance of the stormwater management system will result in future
compliance problems.
If any parts, requirements, or limitations contained in this permit are unacceptable, you have the
right to request an adjudicatory hearing upon written request within thirty (30) days following
receipt of this permit. This request must be in the form of a written petition, conforming to
Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative
Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this
permit shall be final and binding..
If you have any questions, or need additional information concerning this matter, please contact
Linda Lewis, or me at (910) 395-3900.
Sincerely,
f Rick Shiver
Water Quality Regional Supervisor
RSS/arl: S:1WQSISTORM WATV3ERMIT1021029.FEB03
CC'. Phil Norris, P.E.
Tony Roberts, New Hanover County Building Inspections
Beth E. Wetherill, New Hanover County Engineering
Linda Lewis
Wilmington Regional Office
Central files
\ 1( _L.FC�IR
N.C. Division of Water Quality 127 Cardinal Drive Extension Wilmington, N.C. 28405 (910) 395-3900 Fax (910) 350-2004 Customer Service
800-623-7748
State Stormwater Management Systems
Permit No. S W8 021029
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
Mr. 1Llichael A. Khan
Empire Distributors Site
New Hanover County
FOR THE
construction, operation and maintenance of a wet detention pond 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 February 5, 2013, 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 3 of this permit, the Project Data Sheet. The stormwater control has
been designed to handle the runoff from 35,050 square feet of impervious area.
3. The tract will be limited to the amount of built -upon area indicated on page 3 of this
permit, and per approved plans. The built -upon area for the future development is limited
to 8,018 ft2.
4. All stormwater collection and treatment systems must be located in either dedicated
cornmon 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. A permit modification must be
submitted and approved prior to the construction of additional built -upon area from
outside of the approved drainage area.
2
State Stormwater Management Systems
Permit No. SW8 021029
DIVISION OF WATER QUALITY
PROJECT DESIGN DATA SHEET
Project Name:
Permit Number:
Location:
Applicant:
Mailing Address:
Application Date:
Receiving Stream/River Basin/Index #
CPF23 18-74-(47.5)
Classification of Water Body:
Drainage Area, acres:
Onsite, ft2:
Offsite, ft2:
Total Impervious Surfaces, ftz:
Building, W:
Parking, ft2:
Sidewalks, ft2:
Future Parking, ft2:
Pond Depth, feet:
TSS removal efficiency:
*Permanent Pool Elevation:
Permitted Surface Area, ft2:
Permitted Storage Volume, ft3:
*Temporary Storage Elevation:
Controlling Orifice:
Permitted Forebay Volume, ft3:
Empire Distributors Site
SW8 021029
New Hanover County
Mr. Michael A. Kahn, Manager
Makwen Development Company, LLC
5417 Wyoming Drive
Charlotte, NC 28273
January 29, 2003
Cape Fear / UT NE Cape Fear River 1
"B Sw"
1.24
1.24
0
35,050
9,600
17,047
385
8,018
4.5'
90% (no filter is required)
96.6
2,996 @Permanent Pool
3,330
97.6
1.0"cp pipe (drawdown in 2-5 days)
1,127
*An assumed elevation of 100 has been assigned to a Sanitary Sewer manhole top at the
intersection of Barbados Boulevard and the 60' public easement. All permit elevations are
referenced from the assumed elevation.
3
State Stormwater Management Systems
Permit No. S W 8 021029
II. 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 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, orifice device, 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.
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 specifications
must be noted on.the Certification. A modification may be required for those deviations.
8. 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.
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, 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 or a CAMA Major permit was sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the approved
plan.
4
State Stormwater Management Systems
Permit No. SWS 021029
10. The permittee shall submit final site layout and grading plans for any permitted future
development areas shown on the approved plans, prior to construction. If the proposed
BUA exceeds the amount permitted under this permit, a modification to the permit must
be submitted and approved prior to construction.
H. 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. Prior to the sale or lease of any portion of the property, the pennittee shall notify DWQ
and provide the name, mailing address and phone number of the purchaser or leasee. An
access/maintenance easement to the stormwater facilities shall be granted in favor of the
permittee if access to the stormwater facilities will be restricted by the sale or lease of any
portion of the property.
13. The permittee must maintain compliance with the proposed built -upon area and ensure
that the runoff from all the built -upon is directed into the penmitted system.
14. 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.
15. The permittee must maintain the current permitted drainage area. No additional runoff
from outside of the permitted drainage area boundary may enter the permitted stormwater
facilities without first applying for and receiving a pen -nit modification.
III. 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 transfer 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. The permittee is responsible for compliance with all pen -nit 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.
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 pcnnittee grants DENR Staff permission to enter the property during normal business
hours for the purpose of inspecting all components of the permitted stor nwater
management facility.
6. The permit may be modified, revoked and reissued or terminated for cause. The filing of
a request for a pennit modification, revocation and reissuance or termination does not
stay any permit condition.
5
I
State Stormwater Management Systems
Permit No. SWS 021029
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 Design Manual.
S. 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 5th day of February, 2003.
NORT CAROLFN E 1RONMENTAL MANAGEMENT COMMISSION
404,
A an W. Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission
C1
State Stormwater Management Systems
Permit No. SW8 021029
Empire Distributors Site
Stonnwater Permit No. SW8 021029
New Hanover 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.
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
7
State Stormwater Management Systems
Permit No. SW8 021029
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. The outlet/bypass structure elevations are per the approved plan.
S. The outlet structure is located per the approved plans.
b. 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.
I0. The permitted amounts of surface area and/or volume have been provided.
11. 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 Inspections
:,
A&K #02216
i i►
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied far use as an original
I. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
Makwen Development Company, LLC
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Michael A. Kahn, Manager
3. Mailing Address for person listed in item 2 above:
5417 Wyoming Drive _
City: Charlotte T State: NC Zip: 28273
Telephone Number: (704) 588-9463
4. Project Name (subdivision, facility, or establishment name -- should be consistent with project name on
plans, specifications, letters, operation and maintenance agreements, etc.):
Empire Distributors Building
5. Location of Project (street address):
At northwest corner of Barbados Blvd. and Los Tortugas Drive
City: Castle Hayne County: New Hanover
6. Directions to project (from nearest major intersection):
Exit off 1-40 at Holly Shelter Rd. Travel east on Holly Shelter Rd. to Barbados Blvd. Site is on
comer of Barbados Blvd. and Los Tortugas Dr.
7. Latitude: 340 20' 56"
Longitude: 770 52' 53"
of project
8. Contact person who can answer questions about the project:
Name: J. Phillip Norris, P.E. Telephone Number: (910) 343-9653
IL PERMIT INFORMATION
Specify whether project is (check one):
X New
Form SWU-101 Version 3.99 Page 1 of 4
Renewal Modification
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) NIA
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
1-877-623-6748.
Ill. PROJECT INFORMATION
In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative
1' (one to two pages) describing stormwater management for the project.
Retention Pond
2. Stormwater runoff from this project drains to the Cape Fear River Basin.
3. Total Project Area: 1.24 AC 4. Project Built Upon Area: 65 OX
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.
Basin Information
Drainage Area I
Drainage Area 2
Receiving Stream Name
UT Northeast Cape Fear River
Receiving Stream Class
91
Drainage Area
53,923 SF 1 1.24 AC
Existing Impervious * Area
0
Proposed Impervious* Area
35,050 SF 10.80 AC
% Impervious* Area (total)
65%
Impervious* Surface Area
Drainage Area t
Drainage Area 2
On -site Buildings
9,600 SF 10.22 AC
On -site Streets
0
On -site Parking..17,047
SF 10.39 AC
On -site Sidewalks
385 SF 10.0088 AC
Other on -site F= k Yc
8,018 SF / 0.184 AC
Off -site
0
Total: 35,050 SF 10.80 AC
Total:
* Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas
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?
NIA
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 he changed or deleted without the consent of the State.
2. No more than 35,050 square feet ofany lot shall he 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 ofswimming pools.
Swales shall not he filled in, piped, or altered except as necessary to provide driveway crossings.
Built -upon area in excess of the permitted amount requires a state stormwater management permit modification
prior to construction.
All permitted runojffrom outparcels or future development shall be directed into the permitted storm water control
system. These connections to the stormwater control system shall he 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 (919) 733-5083 for
the status and availability of these forms.
Form SWU-102
Form SWU-103
Form S W U-104
Form SWU-105
Form SWU-106
Form S W U-107
Form SWU-108
Form SWU-109
Wet Detention Basin Supplement
Infiltration Basin Supplement
Low Density Supplement
Curb Outlet System Supplement
Off -Site System Supplement
Underground Infiltration Trench Supplement
Neuse River Basin Supplement
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.
Initial
• 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
Wetlands delineated, or a note on plans that none exist
- Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations
Drainage areas delineated
Vegetated buffers (where required)
VII. AGENT AUTHORIZATION
If you wish to designate authority to another individual or firm so that they may provide information on your
behalf, please complete this section.
J. Phillip Norris, P.E.
Designated agent (individual or firm): Andrew & Kuske Consulting Engineers, Inc.
Mailing Address: 902 Market Street
City: Wilmington State: NC Zip: 28401
Phone: (910) 343-9653
Vlll. APPLICANT'S C1RTIFICATION
Fax: (910) 343-9604
I, (print or type name ofperson listed in General Information, item 2) Michael A. Kahn ,
Certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions and
protective covenants will be recorded, and that the proposed project complies with the requirements of 15A NCAC
2H.1000,
Signature:
Form SWU-101 Version 3.99 Page 4 of 4
Date: It) -I 1. D 2—
A&K #02216
Permit No.. Q80 ataa�
State of North Carolina (to be provided by DWQ)
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This farm 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: Empire Distributors Build
Contact Person: Michael A. Kahn Phone Number:
For projects with multiple basins, specify which basin this worksheet applies to:
elevations
Basin Bottom Elevation 92.10 ft.
Permanent Pool Elevation 96.60 ft.
Temporary Pool Elevation 9T60 ft.
areas
(704) 588-9463
NIA
(floor of the basin)
(elevation of the orifices)
(elevation of the discharge structure overflow)
Permanent Pool Surface Area
2,996
sq. ft.
(water surface area at the orifice elevation)
Drainage Area
1.24
ac.
(on -,site and off -site drainage to the bavin)
Impervious Area
0.80
ac.
(on -site and off -site drainage to the basin)
volumes
Permanent Pool Volume
4,799
cu. ft.
(combined volume of main basin and forebay)
Temporary Pool Volume
3,330
cu. ft.
(volume detained above the permanent pool)
I+orebay Volume
1,127
cu. ft.
(approximately 20% of total volume)
Other parameters
SAIDA' 0.0515 (surface area to drainage area ratio from DWQ table)
Diameter of Orifice 1.0 in. (2 to 5 day temporary pool draw -down required)
Design Rainfall 1.0 in.
Design TSS Removal 2 90 % (minimum 85% required)
Form SWU-102 Version 3.99 Page 1 of 4
Footnotes:
When using the Division SAIDA tables, the correct SAIDA ratio for permanent pool siting should be computed based upon the
actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the connect 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 909/6TSS 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 211 .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.
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.
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. 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.
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) ❑ does
This system (check one) ❑ does
® does not incorporate a vegetated filter at the outlet.
® does not incorporate pretreatment other than a forebay.
Form SWU-102 Version 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 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 3.37 feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads 2.32 feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 96.60
Sediment Rekioval El. 94.28
_____________ ____ Sediment Removal Elevation 93.23 75%
Bottom E`Ivati.n 93.5 5%-------------------------------------- ---
Bottom Elevation 92.90 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.
C. 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 Version 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 I am responsible for the performance of the seven
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any
changes to the system or responsible party.
Print name: Michael A. Kahn
Title: M A Iq
Address: 5417 Wyoming Drive Charlotte, NC 28273
Phone: 704-588-9463
Signature:L���
Date: % b . k k • o
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, -n ne- , a Notary Public for the State of �0&774 &40(INA
County of NE-ckl-LL AI By Ze , do hereby certify that ( C (-j R EL j4 l�I'-t7 dAj
T11
Personally appeared before me this f l z day of To13 e7Z ., ,Z00,7_ , and acknowledge the due
Execution of the foregoing wet detention basin maintenance requirements. Witness my hand and official seal.
Form SWU-102 Version 3.99 Page 4 of 4
State Stormwater Management Systems
Permit No SW8 021029
TO: Linda Lewis, Environmental Engineer
NC DENR/Division of Environmental Management
Water Quality Section
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
RE: Empire Distributors Site
New Hanover County, NC
A & K Project No. 02216
Engineer's Certification
1, J. Phillip Norris, P.E. , as a duly registered Professional Engineer in the State of
North Carolina, having been authorized to observe (periodically, weekly, full 6me) the construction of the project,
Distributors Site
(Project)
for Makwen Development Company, LLC (Project Owner) hereby state that, to the best of my abilities, due
care and diligence were 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.
Required items to be checked for this certification to be considered complete are on page 2 of this form.
Noted deviations from approved plans and specifications:
JPNlasn
02216 09-17-03-s-sw-=rt.
Signature
ff
Registration No. 11966
Date ( / September 17, 2003
CC' Tony Roberts, New Hanover County Building Inspector
Michael Kahn 1 Makwen Development Company, LLC
_-_-- CONSULTING ENGINEERS, INC.
902 Market Street Wilmington, NC 28401-4733
910-343-9653 Phone 910-343-9604 Fax
www.andrewandkuske.com
S EAL
o $ �
11966 SlAir
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Certification Requirements:
f
(,_... 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.
L
All the built -upon area associated with the project is graded such that the runoff drains to the
system.
The outlet/bypass structure elevations are per the approved plan.
The outlet structure is located per the approved plans.
Trash rack is provided on the outlet/bypass structure.
L
All slopes are grassed with permanent vegetation.
Vegetated slopes are no steeper than 3:1.
The inlets are located per the approved plans and do not cause short-circuiting of the system.
The permitted amounts of surface area and/or volume have been provided.
. Required drawdown devices are correctly sized per the approved plans.
1 All required design depths are provided.
.4�.3 `All required parts of the system are provided, such as vegetated shelf, and a forebay.
/4o The overall dimensions of the system, as shown on the approved plans, are provided.
cc: Tony Roberts, New Hanover County Building Inspector
Michael Kahn / Makwen Development Company, LLC
CONSULTING ENGINEERS, INC.
902 Market Street Wilmington, NC 28401-4733
910-343-9653 Phone 910-343-9604 Fax
www.andrewandkuske.com