HomeMy WebLinkAboutSW1080103_Cover Letter & Permit_20080605of wn rF9
O� DG Michael F. Easley, Governor
4
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
- Colcen H. Sullins, Director
Division of Water OuaGry
May 14, 2008
Mr. Bo Caldwell
Senior Director for Facilities of Henderson County Public Schools I HFJUN 2 0 2008
414 Fourth Avenue West
Hendersonville, NC 28739-4261
WATER QUALITY SECTION
Subject: NPDES Phase II Stormwater Permit No. SW1080103 ASHEVILLE REMCNAL o G
Henderson County Schools, Hillandale Elementary School
High Density Commercial Wet Pond Project
Henderson County
Dear Mr. Caldwell:
The Stormwater Permitting Unit received a complete Stormwater Management Permit
Application for Henderson County Schools — associated o
ed Parking Area and Stormwater Wet Pond Project nM Elementary 2, 2008. School anStaff review of the plans and specifications has determined that the pro1.ect, as proposed, will
comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000 and
Session Law 2006-246. We are forwarding Permit No. SW1080103, dated May 14,
2008, for the construction of the subject project.
This permit shall be effective from the date of issuance until May 14, 2018, 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 inspection and maintenance of the stormwater
management system will result in future compliance problems.
If any parts, requirements, or limitations contained in this permit are unacceptable, you
have the right to request an adjudicatory hearing upon written request within sixty (60)
days following receipt of this permit. This request must be in the form of a written
petition, conforming to Chapter 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.
This project will be kept on file at the Asheville Regional Office. If you have any
questions, or need additional information concerning this matter, please contact
Jennifer Jones at (919) 733-5083, extension 591; or jennifer.jones@ncmail.net.
Sincerely,
for oleen H. Sullins
cc: Douglas K. Draffen, PE,
Charlotte, NC 28227
Asheville Regional Office
Central Files
SPUII
McKim & Creed, 8020 Tower Point Drive,
I es ��tnCarolina
Attachments �valurallJ
North Carolina Division of Water Quality 1617 Mail Service Center
Internet www ncwatemualiry org Raleigh, NC 27699-1617 Phone (919) 733-5083 Customer Service
Location: 512 N. Salisbury St. Raleigh, NC 27604 Fax 919 733-9612 1_
( ) 877-623-6748
An Equal Opportunity/Affirmative Action Employer — 50% Recycled/10% Post Consumer Paper
Phase II Stormwater Permit
Permit No.SW1080103
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
NPDES PHASE II 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
Bo Caldwell / Henderson County Schools
Hillandale Elementary School —School, Parking Area, and Stormwater Wet Pond
191 Preston Lane, Hendersonville, Henderson County
FOR THE
construction, operation and maintenance of a wet detention pond in compliance with
the provisions of 15A NCAC 2H .1000 and S.L. 2006-246 (hereafter referred to as the
"stormwater rules') and the approved stormwater management plans and specifications
and other supporting data as attached and on file with and approved by the Division of
Water Quality and considered a part of this permit.
This permit shall be effective from the date of issuance until May 14, 2008, and shall be
subject to the following specified conditions and limitations:
I. DESIGN STANDARDS
1. This permit is effective only with respect to the nature and volume of stormwater
described in the application and other supporting data.
2. This stormwater system has been approved for the management of stormwater
runoff as described in Section 1.6 on page 3 of this permit. The stormwater
control has been designed to handle the runoff from 537,581 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.
4. All stormwater collection and treatment systems must be located in either
dedicated common areas or recorded easements. The final plats for the project
will be recorded showing all such required easements, in accordance with the
approved plans.
5. The runoff from all built -upon area within the permitted drainage area of this
project must be directed into the permitted stormwater control system.
Page 1 of 6
Phase II Stormwater Permit
Permit No.SW1080103
A
The following design criteria have been provided in the wet detention pond and
must be maintained at design condition:
a. Drainage Area, ayes:
Onsite, ft :
Offsite, ft2:
Q
C.
d.
e.
f.
9.
i.
J•
k.
I.
m
n.
o.
Total Impervioys Surfaces, ft2:
Buildings ft :
Roads/Parking, ft2:
Other, ft 2.
Offsite, ft2:
Pond Depth, feet:
TSS removal efficiency:
Design Storm:
Permanent Pool Elevation, FMSL�:
Permitted Surface Area @ PP, ft :
Permitted Storage Volume, ft3:
Storage Elevation, FMSL:
Controlling Orifice:
Permanent Pool Volume, ft3:
Forebay Volume, ft3:
Receiving Stream/River Basin:
Stream Index Number:
Classification of Water Body:
II. SCHEDULE OF COMPLIANCE
12.34
505,296
32,285
297,791
78,135
173,024
14,398 (sidewalks) .
32,234
3
85%
1.0 inch
2176.00
13,137.
24,413 at temporary pool
2177.64
2.5"0 pipe
40,975
7,65.1
UT to Bat Fork/ French Broad
6-55-8-1
„C„
The stormwater management system shall be constructed in its entirety,
vegetated and operational for its intended use prior to the construction of any
built -upon surface.
2. During construction, erosion shall be kept to a minimum and any eroded areas of
the system will be repaired immediately. .
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.
5. 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.
Page 2 of 6
Phase II Stormwater Permit
Permit No.SW 1080103
6. Upon completion of construction, prior to issuance of a Certificate of Occupancy,
and prior to operation of this permitted facility, a certification must be received
from an appropriate designer for the system installed certifying that the permitted
facility has been installed in accordance with this permit, the approved plans and
specifications, and other supporting documentation. Any deviations from the
approved plans and specifications must be noted on the Certification. A
modification may be required for those deviations.
7. If the stormwater system was used as an Erosion Control device, it must be
restored to design condition prior to operation as a stormwater treatment device,
and prior to occupancy of the facility.
8. Access to the stormwater facilities shall be maintained via appropriate
easements at all times.
The permittee shall submit to the Director and shall have received approval for
revised plans, specifications, and calculations prior to construction, for any
modification to the approved plans, including, but not limited to, those listed
below:
a. Any revision to any item shown on the approved plans, including the
stormwater management measures, built -upon area, details, etc.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area or to the
drainage area.
e. Further subdivision, acquisition, lease or sale of all or part of the project
area. The project area is defined as all property owned by the permittee,
for which Sedimentation and Erosion Control Plan approval or a CAMA
Major permit was sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the
approved plan.
10. The permittee shall submit final site layout and grading plans for any permitted
future areas shown on the approved plans, prior to construction.
11. A copy of the approved plans and specifications shall be maintained on file by
the Permittee for a minimum of ten years from the date of the completion of
construction.
12. The Director may notify the permittee when the permitted site does not meet one
or more of the minimum requirements of the permit. Within the time frame
specified in the notice, the permittee shall submit a written time schedule to the
Director for modifying the site to meet minimum requirements. The permittee
shall provide copies of revised plans and certification in writing to the Director
that the changes have been made.
III. GENERAL CONDITIONS
This permit is not transferable except after notice to and approval by the Director.
In the event of a change of ownership, or a name change, the permittee must
submit a completed Name/Ownership Change form, to the Division of Water
Quality, signed by both parties, and accompanied by supporting documentation
as listed on page 2 of the form. The project must be in good standing with the
Division. The approval of this request will be considered on its merits and may or
may not be approved.
2. The permittee is responsible for compliance with all permit conditions until such
time as the Division approves the transfer request.
Page 3 of 6
Phase II Stormwater Permit
Permit No.SW 1080103
3. 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.
4. The issuance of this permit does not preclude the Permittee from complying with
any and all statutes, rules, regulations, or ordinances, which may be imposed by
other government agencies (local, state, and federal) having jurisdiction.
5. 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.
6. The permittee grants DENR Staff permission to enter the property during normal
business hours for the purpose of inspecting all components of the permitted
stormwater management facility.
7. The permit issued shall continue in force and effect until revoked or terminated.
The permit may be modified, revoked and reissued or terminated for cause. The
filing of a request for a permit modification, revocation and re -issuance or
termination does not stay any permit condition.
8. 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.
9. Approved plans and specifications for this project are incorporated by reference
and are enforceable parts of the permit.
10. The issuance of this permit does not prohibit the Director from reopening and
modifying the permit, revoking and reissuing the permit, or terminating the permit
as allowed by the laws, rules and regulations contained in Session Law 2006-
246, Title 15A NCAC 2H.1000, and NCGS 143-215.1 et.al.
11. The permittee shall notify the Division of any name, ownership or mailing
address changes at least 30 days prior to making such changes.
Permit issued this the 14'h day of May, 2008.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Division of Water Quality
By Authority of the Environmental Management Commission
Page 4 of 6
Phase II Stormwater Permit
Permit No.SW1080103
Hillandale Elementary School —School, Parking Area, and Stormwater Wet Pond
Stormwater Permit No. SW1080103
Henderson County
Designer's Certification
1, , as a duly registered
in the State of North Carolina, having been authorized to observe (periodically/ weekly/
full time) the construction of the project,
Hillendale Elementary School — School, Parking Area and Stormwater Wet Pond
I U)tlla)
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
Page 5 of 6
Phase II Stormwater Permit
Permit No.SW 1080103
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.
8. All slopes are grassed with permanent vegetation.
9. Vegetated slopes are no steeper than 3:1.
10. The inlets are located per the approved plans and do not cause short-
circuiting of the system.
11. The permitted amounts of surface area and/or volume have been
provided'.
12. Required drawdown devices are correctly sized per the approved plans.
13. All required design depths are provided.
14. All required parts of the system are provided, such as a vegetated shelf,
and a forebay.
15. The required system dimensions are provided per the approved plans.
Please submit this Designer's Certification to: DENR Asheville Regional Office
Surface Water Protection
2090 US Highway 70
Swannanoa, NC 28778
Page 6 of 6