SW8080744_HISTORICAL FILE_20091015

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 O$07,414
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
200 C>110 15
YYYYMMDD

NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Colleen H. Sullins
Governor Director
October 15, 2009
Mr. Thomas B. Morris, Senior Vice President
First Citizens Bank and Trust Company
P.O. Box 27131
Raleigh, NC 27611
Subject: State Stormwater Management Permit No. SW8 080744 MOD
First Citizens Bank
High Density Commercial Infiltration Trench Project
Brunswick County
Dear Mr. Morris:
Dee Freeman
Secretary
The Wilmington Regional Office received a complete, modified State Stormwater
Management Permit Application for First Citizens Bank on September 24, 2009. Staff
review of the plans and specifications has determined that the project, as proposed, will
comply with the Stormwater Regulations set forth in Session Law 2006-246 and Title
15A NCAC 21-1.1000. We are forwarding Permit No. SW8 080744 dated October 15,
2009, for the construction of the subject project.
This permit shall be effective from the date of issuance until August 21, 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 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 Christine Nelson, or me at [phone].
Sincerely,
�0'E��
Georgettn
Stormwater Supervisor
Division of Water Quality
GDS/can: S:\WQS\STORMWATER\PERMIT\080744MOD.oct09
cc: Peter A. Bishop, Kimley- Horn and Associates, Inc
Brunswick County Building Inspections
Jeff Phillips, Brunswick County Engineering
Christine Nelson
LiWilmington Regional -Office , Central Files
Wilminglon Regional Office
127 Cardinal Drive Extension, Wilmington, North Carolina 28405 One 1
Phone: [phone] FAX: [phone] Customer Service: 1-877-623-6748 Norte t-. l Cdioll na,
Internet: www.nmaterquality.org a atUA7//I,
An Equal Opportunity \ Affirmative Action Employer �/ V `(i/U

State Stormwater Management Systems
Permit No. SW8 080744 MOD
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY COMMERCIAL 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
Thomas B. Morris & First Citizens Bank and Trust Company
First Citizens Bank
8900 East Oak Island Drive, Oak Island, Brunswick County
FOR THE
construction, operation and maintenance of an underground infiltration trench in
compliance with the provisions of Session Law 2006-246 and 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 August 21, 2018, 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.
This stormwater system has been approved for the management of stormwater
runoff as described in Section 1.8 on page 3 of this permit. The stormwater
control has been designed to handle the runoff from 30,928 square feet of
impervious area.
A vegetated filter has been waived for this system.
4. The tract will be limited to the amount of built -upon area indicated in Section 1.8
on page 3 of this permit, and per approved plans. This permit does not provide
any allocation of built -upon area for future development.
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.
Page 2 of 8

State Stormwater Management Systems
Permit No. SW8 080744 MOD
6.
7.
8.
The runoff from all built -upon area within the permitted drainage area of this
project must be directed into the permitted stormwater control system.
The built -upon areas associated with this project shall be located at least 30 feet
landward of all perennial and intermittent streams.
The following design criteria have been provided in the infiltration trench and
must be maintained at design condition:
ffl
01
n.
o.
P.
q
r.
S.
t.
Drainage Area, acres:
Onsite, ft`:
Offsite, ft`:
Total Impervious Surfaces, ft`:
Onsite, ft`:
Offsite, ft`:
Design Storm, inches:
Trench Length, ft:
Trench Width, ft:
Trench Height, ft:
Number of Stormtech Chambers:
Chamber volume, ft':
Bottom Elevation, FMSL:
Bypass Weir Elevation, FMSL:
Permitted Storage Volume, ft':
Predevelopment 1 year 24 hour
peak flow rate, cfs:
Post development 1 yr 24 hour
peak flow rate, cfs:
Type of Soil:
Expected Infiltration Rate, in/hr:
SHWT, FMSL:
Time to Draw Down, days:
Receiving Stream/River Basin:
Stream Index Number:
Classification of Water Body:
II. SCHEDULE OF COMPLIANCE
1.32
57,500
0
30,928
30,928
0
4.06 (1yr-24 hr rainfall depth)
74.27
30
3.5
51
45.9
13.5
17.0
4,525 (pre/post difference)
0.63
1.96
Kureb Fine Sand
10.0
11.5
0.56
UT to Elizabeth River
18-88-9-2-(1)
SA/HQW
1. 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 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.
4. 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.
Page 3 of 8

State Stormwater Management Systems
Permit No. SW8 080744 MOD
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. Mowin.9 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 bypass structure, filter media, flow
spreader, catch basins, piping and vegetated filter.
g. A clear access path to the bypass structure must be available at all times.
Records of maintenance activities must be kept for each permitted BMP. The
records will indicate the date, activity, name of person performing the work and
what actions were taken.
The permittee shall submit to the Division of Water Quality an annual summary
report of the maintenance and inspection records for each BMP. The report shall
summarize the inspection dates, results of the inspections, and the maintenance
work performed at each inspection.
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.
Access to the stormwater facilities shall be maintained via appropriate
easements at all times.
10. 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.
11. The permittee shall submit final site layout and grading plans for any permitted
future areas shown on the approved plans, prior to construction.
12. 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.
Page 4 of 8

State Stormwater Management Systems
Permit No. SW8 080744 MOD
13. 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 to any person or entity except after notice to and
approval by the Director. At least 30 days prior to making a change of ownership,
or a name change of the owner or project, or a mailing address change, the
permittee must submit a completed and signed Name/Ownership Change form tc
the Division of Water Quality, accompanied by the supporting documentation as
listed on the form. 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.
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 reissuance 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 21-1.1000, and NCGS 143-215.1 et.al.
Page 5 of 8

State Stormwater Management Systems
Permit No. SW8 080744 MOD
11. The permittee shall submit a permit renewal application at least 180 days prior to
the expiration date of this permit. The renewal request must include the
appropriate documentation and the processing fee.
Permit issued this the 15`h day of October, 2009.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
ror coieenjp. 5uurns, Director
Division of Water Quality
By Authority of the Environmental Management Commission
Page 6 of 8

State Stormwater Management Systems
Permit No. SW8 080744 MOD
First Citizens Bank
Stormwater Permit No. SW8 080744 MOD
Brunswick 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
Page 7 of 8

State Stormwater Management Systems
Permit No. SW8 080744 MOD
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 bypass structure elevations are per the approved plan.
6. The bypass structure is located per the approved plans.
7. A 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. All required design depths are provided.
13. All required parts of the system are provided.
14. The required system dimensions are provided per the approved plans.
cc: NCDENR-DWQ Regional Office
Brunswick County Building Inspections
Page 8 of 8

DWQ USE ONLY
Defile Received
Pee Paid
Permit Number
O10 "7/y'/9
S100&7A4 7
State of North Carolina
Department of Environment and Natural Resource, mxvzj3
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORIVI1 9 2009
This frw may be photocopied for use as an original
BY:
I. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
First Citizens Bank and Trust Company
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
'FVtornas
Phrxms 13. Morris, Senior Vice President
3. Mailing Address for person listed in item 2 above:
State:NC Zip:27611
Phone: (919 . ) 716-8239 Fax: (919 ) 716-8840
EmaiLthomes.morris «firstcitizens.com
4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
5. Location of Project (sh"cet address):
8900 last Oak Island Drive
Cily:Oak Island County:13runswick Zip:28465
6. Directions to project (from nearest major intersection):
Project is located in the North East corner of the intersection of East Onk Island Drive and McGlamery Street
in the town of Oak Island, North Carolina
7, Latitude:33° 54' 31.81" N Longitude:78' 04' 30.55" W of project
8. Contact person who can answer questions about the project:
NameTeter A. Bishop, P.E. 'telephone Number: (919 ) 677-2164
[e-mail]
H. PERMIT INFORMATION:
I. Specify whether project is (check one)
❑New
❑Renewal ®Modification
Form SWU-101 Version 03.27.08
Page I ol'4

2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit numberSWB 080744 and its issue date (if known)08/2"1 /2008
3. Specify the type of project (check one):
❑Low Density ®High Density ❑Redevelop ❑General Permit ❑Universal SMP ❑Other
Additional Project Requirements (check applicable blanks; information on required state permits can be
obtained by contacting the Customer Service Center at 1-877-623-6748):
❑CAMA Major ®Sedimentation/Eros ion Control ❑404/401 Permit ❑NPDESStormwater
Ill. PROJLCI• 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 routed from impervious areas via curb and gutter to an underground Stormtech infiltration
system Stormwater is stored within the infiltration system utilizing a control structure Stormtech utilizes a
system of perforated molded plastic chambers and a stone foundation for infiltration. Stormwater overflows
outfall to an existing NCDOT drainage sytem that drains to unamed tributary and eventually into the Elizabeth
River. The Elizabeth River is classified as an SA/FIQW water body.
2. Stormwater runoff from this project drains to the Cave Fear River basin.
3. 'Total Property Area: 1.32 acres 4. Total Wetlands Area: 0 acres
5. 100' Wide Strip of Wetland Area: N/A awes (not applicable if no wetlands exist on site)
6. Total Project Area**:1.16 acres 7. Project I3uilt Upon Area:53.8 qo
8. I -low many drainage areas does the project have?]
9. 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.
For hieh density proiects, complete the table with one drainage area for each engineered stormwater device.
Basin Information
Drainage Area 1
Drainage Area 2
Receiving Stream Name
Unnamed Tributary to Elizabeth
River
Stream Class & Index No.
SA / HQW; '18-88-9-2-(1)
Total Drainage Area (sf)
57500 ( 1.3au
On -site Drainage Area (so
57500
Off -site Drainage Area (so
0
Existing Impervious* Area (so
16,839
Proposed Impervious*Area (sf)
30,928
%, lmpervious* Area (total)
53.8
Impervious Surface Area
Drainage Area 1
g
Drainage Area 2
On -site Buildings (sf)
4835
On -site Streets (so
0
On -site Parking (sf)
24,602
Ou-site Sidewalks (so
1,491
Other on -site (so
0
Off -site (s1)
0
'rota) (so:
30,928
Form SWU-101 Version 03.27.09 Page 2 of

Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sideroalks, gravel areas, etc.
"Total project area shall be calculated based on the current policy regarding inclusion Of Wetlands in the built upon area
percentage calculation. This is the area used to calculate percent project built upon area (BLIA).
10. How was the off -site impervious area listed above derived?
IV. DEI?D RESTRICTIONS AND PROTECTIVE COVENANTS
One of the following 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. Forms can be
downloaded from htto'//h2o ear state nc.us/su/bap forms htm - deed restrictions.
Form DRPC-I High Density Commercial Subdivisions
Form DRPC-2 High Density Developments with Outparcels
Form DRPC-3 High Density Residential Subdivisions
Form DRPC-4 Low Density Commercial Subdivisions
Form DRPC-5 Low Density Residential Subdivisions
Form DRPC-6 Low Density Residential Subdivisions with Curb Outlets
By your signature below, you certify that the recorded deed restrictions and protective covenants for this
project shall include all the applicable items required in the above form, 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 slate stornnvater management permit supplement form(s) listed below must be submitted for each
BMP specified for this project. Contact the Slormwater and General Permits Unit at [phone] for the status
and availability of these forms. Forms can be downloaded from lilt[,//li2o.enr.state.nC.us/su/bap forms.htm.
Form SW401-1,ow Density
Norm SW401-Curb Outlet System
Norm SW401-Off-Site System
Norm SW40"1-Wet Detention Basin
Form SW401-Infiltration Basin
Norm SW401-Infiltration Trench
Form SW401-13ioretention Cell
Norm SW40"t-Level Spreader
Norm SW40"1-Wetland
Form SW401-Grassed Swale
Norm SW401-Sand Filter
Form SW401-Permeable Pavement
Low Density Supplement
Curb Outlet System Supplement
Off -Site System Supplement
Wet Detention Basin Supplement
Infiltration Basin Supplement
Underground Infiltration "french Supplement
Bioretention Cell Supplement
Level Spreader/Filter Strip/Restored Riparian Buffer Supplement
Constructed Wetland Supplement
Grassed Swale Supplement
Sand Filler Supplement
Permeable Pavement Supplement
Norm SWU-101 Version 03.27.08 Page 3 of

• V1. SUBMI'17AL 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 Office. (Appropriate office may be found by locating project on the
interactive online map at htto://112o.enr.state nc.us/su/msi maps.hurn)
Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
Initials
• Originnl and ooe copy of the Stormwater Management Permit Application Form f
• Original and one copy of the Deed Restrictions & Protective Covenants Form (if NIA
required as per Part IV above)
• Original of the applicable SupplementForm(s) and O&M agreement(s) for each BMP 16'
• Permit application processing fee of $505 (Express: $4,000 for I -ID, $2,000 for LD)
payable to NCDENR 4
• Calculations & detailed narrative description of stonnwater treatment/management AR
• Copy of any applicable soils report AV
• Two copies of plans and specifications (sealed, signed & dated), including:
- Development/Project name
- Engineer and firm
- Legend
- North arrow
Scale
Revision number & dale
- 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 casements, 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. (ex. designing engineer or firm)
Designated agent (individual or firm):Kimley-Horn and Associates, Inc. - Peter A. Bishop, P.E.
Mailing Address:3001 Westton Parkway
Statc:NC Zip:27513
Phone: (919 ) 677-2000 Pax: (919 ) 677-2050
Email:Peter Bishoprr kimley-horn com
VIIL APPLICANT'S CERTIFICATION
I, (Print or type nnrme of person listed in General Information, itent 2) Thonms B. Morris
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 cov will be recorded, and that the proposed project complies with the requirements of "15A
NCAC 2I-I .1000.A A c
v
Signature: Date:
Form SWU-101 Version 03.27.08 Page 4 of

i
Nelson, Christine
From: John. [e-mail]
Sent: Thursday, September 24, 2009 3:42 PM
To: [e-mail]
Cc: [e-mail]; Peter. [e-mail]
Subject: First Citizens Bank Oak Island - Stormwater project No. SW8080744
Attachments: Infiltration Trench revised-9-24-09.pdf; Master Summary-9-24-09.pdf; ST-Stage
Storage-9-24-09.pdf; 37152_SWM BASE -POST Feb REV 1 092409 P1.pdf
Ms. Nelson,
Please find attached requested supporting information which demonstrates the previously approved Stormtech System
will provide the required volume without the additional three (3) installed chambers. We have attached the revised
infiltration trench supplement, Stormtech Stage Storage Worksheet, revised Pond Pack Flow summaries and revised
post -development exhibit for your review.
You will find that when considering the additional storage provided by the perimeter stone, the result is there will be
approximately 500 cubic feet of additional storage beyond the minimum requirement. The pond pack results clearly
show the provided volume will allow the runoff from the 1 year storm to fully infiltrate. It is also important to note the
10"/hour infiltration rate used in the calculations is very conservative as the geotechnical boring taken directly under the
proposed system was 27.8"/hour. The 10"/hour was used at the direction of the on -site DWQ inspector who observed
the soil borings.
We would request the installed system which was previously approved under the original permit be considered
adequate based on the supporting calculations. We would also request that the outstanding comments with regard to
the additional three (3) chambers be retracted since we have demonstrated the previously approved system is
adequate on its own to meet parking plan modification. Feel free to contact us with questions. Thanks.
John Kuzenski, P.E.
Kimley-Horn & Associates, Inc.
333 Fayetteville Street
Suite 600
Raleigh, NC 27601
Main: 919-835-1494
Direct: 919-653-2990
Fax: [phone]
From: Nelson, Christine[mailto:[e-mail]]
Sent: Wednesday, September 23, 2009 3:58 PM
To: Dan Trask
Subject: RE: First Citizens Bank Oak Island - Stormwater project No. SW8080744
Dan,
If the original system can be shown to provide the required volume without the additional chambers, then the engineer
needs to provide the supporting documentation along with any updated forms when he submits the additional
information.
Christine
Christine Nelson
Environmental Engineer

NC D WQ - Stormwater Program
Wilmington Regional Office
910-796-7323
E-mail correspondence to and from this address may be subject to the North
Carolina Public Records Law and may be disclosed to third parties.
From: Dan Trask [mailto:[e-mail]]
Sent: Tuesday, September 22, 2009 4:11 PM
To: [e-mail]
Subject: First Citizens Bank Oak Island - Stormwater project No. SW8080744
Hello Christine,
Just wanted to get you some additional information that I did not send you yet pertaining to the StormTech Detention
System and permit for the above project.
I understand that the original permit application had been approved using the 51 StormTech Chambers with appropriate
manifold connections. The problem in permitting arose when the additional 3 chambers were added because those
chambers were not attached to the manifold.
John Kuzenski of Kimley-Horn had added those additional 3 chambers to add additional volume to the system because
the impervious area had increased. I have just discussed with John that the addition of those 3 additional chambers is
actually unnecessary because we have additional volume we can take credit for with the approved version of 51
chambers.
The entire bed of the StormTech System uses a one foot perimeter stone for safety factor. If the additional stone void for
the one foot perimeter is included with the volume of the originally approved system of 51 chambers, then this adjusted
volume would put us over and above the required volume without having to take credit for the additional 3 chambers that
were installed without being attached to the manifold. We could just disregard that those additional chambers are part of
the system, because the required storage volume is already available in the original 51 chambers, and in the stone voids
both above the chambers, below the chambers, in between the rows of chambers, and also in the one foot perimeter
stone around the chamber bed.
Please see the attached incremental storage sheet which illustrates that the required volume is contained in the original
51 chamber design, and it is not necessary to credit the additional 3 chamber with any storage volume. The volume
available for storage in the 51 chamber layout including all available stone void is 4,525.30 Cubic Feet which exceeds the
requirement for this project.
Thank you very much and please let me know your thoughts on this information
Sincerely,
Dan Trask
Regional Product Manager
d tras k(cDsto rmtec h.c o m
StormTech
Phone: [phone]
Fax: [phone]
www.stormtech.com

NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
September 1, 2009
Mr. Thomas B. Morris, Senior Vice President
First Citizens Bank and Trust Company
PO Box 27131
Raleigh, NC 27611
Subject: Request for Additional Information
Stormwater Project No. SW8 080744
First Citizens Bank
Brunswick County
Dear Mr. Morris:
Dee Freeman
Secretary
The Wilmington Regional Office received a modified State Stormwater Management
Permit Application for the First Citizens Bank on February 19, 2009 with additional
information received on April 28, 2009 and July 15, 2009. A preliminary review of that
information has determined that the application is not complete. The following
information is needed to continue the stormwater review:
Since the installed system appears to have a unique operation and maintenance
requirement, the current operation and maintenance agreement (0&M) needs to
be updated to include those practices that are specific to the "isolator" row. The
O&M must clearly describe and demonstrate how the system will be cleaned as
well as how often the system will be cleaned. This O&M must also address, but
not be limited to, the issues identified in the generic O&M signed in July 2008.
The modified O&M must be signed and notarized.
2. Please be advised that because the installed system does not meet the
requirements of the Division, quarterly monitoring of the system must be
conducted on both influent and any excess runoff that is not infiltrated. A
monitoring plan will need to be submitted to the Division for approval within 60
days from date the permit modification has been issued and must be based on
the conditions that will be outlined in the permit.
3. Please be advised that the permit will also require the system to be repaired or
replaced if it is determined that the system is not functioning properly.
Please note that this request for additional information is in response to a preliminary
review. The requested information should be received in this Office prior to October 2,
2009, or the application will be returned as incomplete. The return of a project will
necessitate resubmittal of all required items, including the application fee.
If you need additional time to submit the information, please mail, email or fax your
request for a time extension to the Division at the address and fax number at the bottom
of this letter. The request must indicate the date by which you expect to submit the
required information. The Division is allowed 90 days from the receipt of a completed
application to issue the permit.
Wilmington Regional Office
127 Cardinal Drive Extension, Wilmington, North Carolina 28405 one
Phone: [phone] FAX: [phone] Customer Service: 1-877-623-6748 North Carolina
Internet:w .ncvvaterquality org Nn//�
An Equal Opportunity l Affirmative Action Employer (/{� a'�atu!al

Thomas B. Morris
September 1, 2009
Stormwater Application No SW8 080744
The construction of any impervious surfaces, other than a construction entrance under
an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and
is subject to enforcement action pursuant to NCGS 143-215.6A.
Please reference the State assigned project number on all correspondence. If you have
any questions concerning this matter please feel free to call me at [phone] or
email me at [e-mail].
Sincerely,
Christine Nelson
Environmental Engineer
GDS/can: S:\WQS\STORMWATERWDDINFO\2009\080744.sep09
cc: Peter A Bishop, Kimley — Horn and Associates, Inc.
Christine Nelson
Wilmington Regional Office
Page 2 of 2

Kimley-Horn
®® and Associates, Inc.
July 14, 2009
Ms. Christine Nelson
North Carolina Dept. of Environment and Natural Resources
Division of Water Quality
127 Cardinal Drive Ext.
Wilmington, NC 28405
Re: First Citizens Bank
Stormwater Project No. SW8080744
Dear Ms. Nelson:
r2ECFyV�r�
5 2009
BY:
In response to your comments issued on 6/29/09, KHA has provided the
following information.
1. A letter from Stormtech explaining maintenance guidelines of
the system with manufacturer's product specifications.
Based on the supporting information provided by Stormtech, the system was
installed per manufacturer's specifications and does not require modification. If
you need any additional information or have any questions or comments, feel
free to contact me directly at 919-653-2990. Mr. Trask from Stormtech has also
offered to meet with you in person to review the Stormtech product design and
maintenance guidelines.
Very truly yours,
KIMLEY-HORN AND ASSOCIATES, INC.
John D. Kuzenski, P.E.
Enclosures: One (1) Stormtech Letter
One (1) Isolator Row O&M Manual
Cc: Tom Morris, FCB
Dan Trask, Stormtech
File
13
TEL [phone]
FAX [phone]
■
Suite 600
333 Fayetteville Street
Raleigh, North Carolina
27601

StormTech-
EnNomxeasoub bswn»Je MMQQm '
Ms. Christine Nelson
North Carolina Dept. of Environment and Natural Resources
Division of Water Quality
127 Cardinal Drive Ext.
Wilmington, NC 28405
Re: First Citizens Bank Stormwater Project No SW8080744
Dear Ms. Nelson:
REC1F'TVF;"
n n 15 2009
BY:
I have been in contact with John Kuzenski of Kimley-Hom regarding the resolution of the matter
concerning the installation of the StormTech Stornwater System for the above referenced project.
It is my understanding after reviewing your letter dated June 29, 2009 that the three additional
StormTech Chambers that were added to the system after the original design were installed without
being connected to the inlet manifold. According to this letter it is required that a manifold connection
be provided to this row of three chambers to provide maintenance and accessibility.
I understand the concerns and requirements that the stomrwater system be accessible and
maintained. StormTech strongly encourages project owners to provide access for maintenance for all
sormwater systems. The StormTech Systems are equipped with a feature called the Isolator Row,
which is designed to capture the overwhelming majority of the runoff (that which is most heavily laden
with sediment), before the stornwater is allowed to enter any of the adjacent non -Isolator Rows. This
is accomplished usually with a bypass structure / weir wall apparatus diverting these flows into the
Isolator Row. Access to these Isolator Rows is required to perform a jet -vac procedure down the entire
run to flush out any debris and sediment that comes to accumulate in these rows over the course of
the year.
These Isolator Rows are the only rows of chambers that are recommended to have this jet -vac
procedure performed upon. The jet -vac equipment is not recommended to be placed in non -Isolator
Rows due to potential scour damage this apparatus could cause to the stone backfill. It is therefore
common practice to design these StormTech Systems to have rows of chambers that are not
necessarily connected to inlet manifolds. The sormwater conveyance is provided to these non -
connected rows through the perforations in the sides of the chambers, and through the voids in the
stone backfill.
Through monitoring of existing installed projects, and numerous water quality field test studies, it has
been confirmed that these Isolator Rows do function as intended to capture the sediment coming into
the system. I am attaching the StormTech Isolator Row Operation and Maintenance Manual, which
illustrates how these Isolator Rows are assembled and cleaned.
I hope this information is helpful. Please feel free to contact me if there are any additional questions or
concerns.
Thank you very much.
Sincerely,, /
Dan Trask
Regional Product Manager
StormTech
[phone]

'i OelentionRelenliaifleclurpe
Subsurface Stormwater Management"
Dan Trask
Regional Product Manager
Main Office
20 Beaver Road, Suite 104 3708 Monique Lane
Wethersfield, CT 06109 Charlotte, INC 28210
888-892-2694 • Fax: [phone] • Fax: [phone]
www.stormtech.com [e-mail]

StormTech-
STORMTECH ISOLATOR" ROW - STEP-BY-STEP MAINTENANCE PROCEDURES
Step 1) Inspect Isolator Row for sediment
A) Inspection ports (if present)
i. Remove lid from floor box frame
ii. Remove cap from inspection riser
iii. Using a flashlight and stadia rod, measure depth of sediment
iv. If sediment is at, or above, 3' (76 mm) depth proceed to Step 2. If not proceed to step 3.
B) All Isolator Rows
i. Remove cover from manhole at upstream end of Isolator Row
ii. Using a flashlight, inspect down Isolator Row through outlet pipe
1. Mirrors on poles or cameras may be used to avoid a confined space entry
2. Follow OSHA regulations for confined space entry if entering manhole
iii. If sediment is at or above the lower row of sidewall holes [approximately 3' (76 mm)] proceed to Step 2. If
not proceed to Step 3.
Step 2) Clean out Isolator Row using the JetVac process
A) A fixed culvert cleaning nozzle with rear facing nozzle spread of 45" (1140 mm) or more is preferable
B) Apply multiple passes of JetVac until backflush water is clean
C) Vacuum manhole surnp as required
Step 3) Replace all caps, lids and covers
Step 4) Inspect and clean catch basins and manholes upstream of the StormTech system following the procedures for
Classic Manifold Inlet System
Figure 19
StormTech Isolator Row (not to scale)
Call StormTech at 860.529.8188 or 888.892.2694 or visit our website at www.stormteeh.com for technical and product information. 23

n
Stormwater Analysis
]First Citizens Bank
8900 .East Oak Island Drive
OakIsland, NC
Prepared for:
First Citizens Bank
©Kimley-Horn and Associates, Inc., 2008
July 9, 2008
®Of7C1 Kimley-Horn
0�—y and Associates, Inc.

Type.... Unit Hyd. (HYG output) Page 7.04
Name.... POST Tag: 1 Event: 1 yr
File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
Storm... Type ill 24hr Tag: 1
SCS UNIT HYDROGRAPH METHOD
STORM EVENT: 1
year storm
Duration
min Rain Depth
= 4.0600 in
Rain Dir
- K:\RAL_LDEV\00FCB\011737152\09_Desi.gn
Calculations\PondPack\
Rain File -ID
= - TypeIII 24hr
Unit Hyd Type
= Default Curvilinear
HYG Dir
- K:\RAL LDEV\OOFCB\011737152\09_Design
Calculations\PondPack\
IIYG File - 10
- - PRE
Tc
= 5.00 min
Drainage Area
= 1.318 acres Runoff CN=
56
Calc.lncrement=
.667 Out.Incr.-
1.00 min
HYG Volume
= 2064 cu.ft
HYDROGRAPH
ORDINATES (cfs)
Time I
Output
Time increment a.1.00
min
min I
.-------I--------------------------------------------------------------
Time on left
represents time for first
value in each
row.
711.00 1
.00
.00 .01
.01
.03
716.00 1
.05
.10 .15
.20
.26
721.00 1
.32
,37 .43
.49
.54
726.00 1
.59
.63 .63
.59
.54
731.00
.50
.48 .47
.46
.44
736.00
.42
.42 .41
.41
.40
741.00 I
.38
.36 .35
.34
.33
746.00 I
.32
.29 .27
.25
.24
751.00 1
.23
.22 .21
.19
.18
756.00 1
.17
.17 .17
.16
.16
761.00 1
.16
:16 .15
.15
.15
766.00 1
.15
.15 .15
,14
.14
771.00 1
.14
.14 .14
.13
.13
776.00 1
.13
.13 .13
.12
.12
781.00 I
.12
.12 .12
.12
.12
786.00
.11
.11 .11
.11
.11
791.00
.11
.11 .11
.11
.11.
796.00 I
.11
.11 .11
.11
.11
001.00 I
.11
.11 .11
.11
.11
806.00
.11
.11 .10
.10
.10
U11.00 1
.10
.10 .10
.10
.10
816.00 I
.10
.10 .10
.10
.10
821.00
.10
.10 .10
.10
.10
026.00 1
.10
.10 .10
.10
.09
631.00 1
.09
.09 .09
.09
.09
836.00 1
.09
.09 .09
.09
.09
041.00
.09
.09 .09
.09
.09
046.00 I
.09
.09 .09
.09
.09
851.00 1
.08
.08 .08
.08
.08
056.00 1
.08
.08 .08
.08
.08
.SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 3:19 PM 7/23/2008

7 ZO 09
Type.... Runoff CN-Area
Name.... PRE
Page 6.02
Fi.le.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
SCS UNIT HYDROGRAPH METHOD
STORM EVENT ClVear sto
Duration - T440.00 min Rain Depth - 4.0600 in
Rain Dir - K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\
Rain File -ID = - TypeIII 24hr
Unit Hyd Type - Default Curvilinear
HYG Dir - K:\RAL LDEV\00FCB\0ll737152\09_Design Calculations\PondPack\
HYG File - ID - - OST
Tc = 5.00 min
Drainage Area = 1.318 acres Runoff CN= 70
Calc.Increment= .667 min Out.Incr.= 1.00 min
HYG Volume t 6554 cu.f.t
HYDROGRAPH ORDINATES (cfs)
Time I
Output Time
increment
= 1.00 min
min
______________________________________________________________
Time on
left represents
time for
first value in
each row.
629.00
.00
.00
.00
.00
.00
634.00
.00
.00
.00
.01
.01
639.00
.01
.01
.01
.01
.01
644.00 1
.01
.01
.01
.01
.01
649.00 1
.01
.02
.02
.02
.02
654.00 1
.02
.02
.02
.02
.02
659.00 1
.02
.02
.02
.03
.03
664.00 1
.03
.03
.03
.03
.03
669.00 1
.04
.04
.04
.04
.04
674.00 1
.04
.05
.05
.05
.05
679.00
.05
.06
.06
.06
.06
684.00 1
.07
.07
.07
.07
.08
689.00 1
.08
.08
.09
.09
.10
694.00 1
.11
.12
.13
.14
.15
699.00 1
.18
.20
.22
.24
.25
704.00 1
.27
.31
.34
.37
.39
709.00 1
.41
.44
.49
.53
.57
714.00 1
.60
.65
.76
.93
1.12
71.9.00 1
1.28
1.40
1.50
1.5B
1.66
724.00 I
1.72
1.79
1.84
1.86
1.79
729.00 I
1.61
1.43
1.29
1.21
1.16
734.00 I
1.11
1.05
1.00
.96
.94
739.00 I
.92
.89
.84
.79
.75
744.00 I
.73
.71
.68
.62
.57
749.00 1
.53
.50
.48
.46
.42
754.00 1
.39
.37
.35
.34
.34
759.00 1
.33
.32
.32
.31
.31
764.00 1
.31
.30
.29
.29
.29
769.00 1
.29
.28
.28
.27
.27
774.00 1
.26
.26
.26
.25
.25
SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 3:19 PM 7/23/2008

First Citizens Bank
8900 Gast Oak Island Drive
Oak Island, NC
STORMWATFR ANALYSIS
Prepared for:
First Citizens Bank
Prepared by:
KIM LEY -HORN AND ASSOCIATES, INC.
3001 WESTON PARKWAY
CARY, NORI'H CAROLINA 2750
July 9, 2008
KHA Project 4011737152
This document, together with the concepts and designs presented herein, as an instrument of service, is intended
only for the specific purpose and client for which it was prepared. Reuse of and improper reliance on this document
without written authorization and adaptation by Kimley-Horn and Associates, Inc. shall be without liability .to
Kimley-I torn and Associates, Inc. .

'TABLE OF CONTENTS
OVERVIEW
APPENDIX A: SITE INFORMATION
USGS QUADRANGLE MAP
USDA SOIL SURVEY MAP
FIMA MAI'
APPENDIX 13: DRAINAGE MAPS
PRI DEVELOPMENT' DRAINAGE AREA MAI'
POST -DEVELOPMENT DRAINAGE AREA MAP
APPENDIX C: PRE & POST DEVELOPMENT SUAIMARY
PRE -DEVELOPMENT VS. POST -DEVELOPMENT PEAK DISCHARGES
APPENDIX D: WATER QUANTITY UNDERGROUND STORAGE CALCULATIONS
UNDERGROUND PIPE STORAGE ROUTING CALCULATIONS
STORMTECH STAGE STORAGE WORKSHEET
APPENDIX E: WATER QUALITY CALCULATIONS
TOWN OF OAK ISLAND STORMWATER MANAGEMENT PLAN FOR COMMERCIAL
DEVELOPMENT SUPPLEMENTAL FORM
PRE -DEVELOPMENT POLLUTANT EXPORT CALCULATIONS
POST -DEVELOPMENT POLLUTANT EXPORT CALCULATIONS
STORMTECH WATER QUALITY CALCULATIONS
APPENDIX F: STORM DRAINAGE SYSTEM DETAILS
OUTLET CONTROL STRUCTURE
STORMCAD PIPE PROFILES
APPENDIX G: STORMTECH DETAILS
STORMTECH DETAILS/SPECIFICATIONS
APPENDIX li: INPUT DATA
CN VALUE TABLE
PRECIPITATION TABLES
HYDROLOGIC SOIL GROUPS

r,
t
APPENDIX A•'
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3.0 Isolator Ro r Stf pr ail Stellf ��fntE n�.rncr° Proccrliu -17
Step 1) Inspect Isolator Row for sediment
A) Inspection ports (if present)
i. Remove lid from floor box frame
ii. Remove cap from inspection riser
iii. Using a flashlight and stadia rod,
measure depth of sediment and
record results on maintenance log.
iv. If sediment is at, or above, 3 inch
depth proceed to Step 2. If not
proceed to step 3.
B) All Isolator Rows
i. Remove cover from manhole at
upstream end of Isolator now
Using a flashlight, inspect down Isolator Row through outlet pipe
1. Mirrors on poles or cameras may be used to avoid a confined space entry
2. Follow OSHA regulations for confined space entry if entering manhole
If sediment is at or above the lower row of sidewall holes (approximately 3 inches) proceed to Step 2.
If not proceed to Step 3.
StormTech Isolator Row (not to scale)
Step 2) Clean out Isolator Row using the JetVac process
A) A fixed culvert cleaning nozzle with rear facing nozzle spread of 45 inches or more is preferable
B) Apply multiple passes of JetVac until backflush water is clean
C) Vacuum manhole sump as required
Step 3) Replace all caps, lids and covers, record observations and actions
Step 4) Inspect & clean catch basins and manholes upstream of the StormTech system
Sample Maintenance Log
'W[JWLL•1J
rim
"Klno2S�
t
W
W
1
3/15/01
6.3 ft.
none
New Inetallation. Fixed point le Cl frame at grade
djm
9/24/01
6.2
0.1 ft.
5ome grit felt
sm
6/20/03
5.8
0.5 ft,
Mui feel, debris visible in manhole and in
ry
Isolator now, maintenance due
777/03
6.3 ft.
1 0
1 5y6tem jetted and vacuumed
djm
6
StormTech®
Detention • Retention • Recharge
Subsurface Stormwater Management'"
20 Beaver Road, Suite 104 Wethersfield I Connecticut 106109
860.529.8188 1888.892.2694 tax 866.328.84011 www.stormtech.com
StormTech products are covered by one or more of the following patents: U.S. Patents: 5,401,459; 5,511,903; 5,716,163; 5,588,778:5,839,844;
Canadian Patents: 2,158,418 Other U.S. and Foreign Patents Pending Printed in U.S.A.
© Copyright. All rights reserved StormTech U-C, 2004 S090104-1

2.0 IsolatorGIS°I;':', rl)(''. c#Clld M ailEatf'C1 •)n 6. e StormTdch-
2.1 INSPECTION
The frequency of Inspection and Maintenance varies
by location. A routine inspection schedule needs to be
established for each individual location based upon site
specific variables. The type of land use (i.e. industrial,
commercial residential), anticipated pollutant load, per-
cent imperviousness, climate, etc. all play a critical role
in determining the actual frequency of inspection and
maintenance practices.
At a minimum, StormTech recommends annual inspec-
tions. Initially, the Isolator Row should be inspected every
6 months for the first year of operation. For subsequent
years, the inspection should be adjusted based upon
previous observation of sediment deposition.
The Isolator Row incorporates a combination of standard
manhole(s) and strategically located inspection ports
(as needed). The inspection ports allow for easy access
to the system from the surface, eliminating the need to
perform a confined space entry for inspection purposes.
If upon visual inspection it is found that sediment has
accumulated, a stadia rod should be Inserted to deter-
mine the depth of sediment. When the average depth
of sediment exceeds 3 inches throughout the length of
the Isolator Row, clean -out should be performed.
2.2 MAINTENANCE
The Isolator Row was designed to reduce the cost of
periodic maintenance. By "isolating" sediments to just
one row, costs are dramatically reduced by eliminating
the need to clean out each row of the entire storage
bed. If inspection indicates the potential need for main-
tenance, access is provided via a manhole(s) located
on the end(s) of the row for cleanout. If entry into the
manhole is required, please follow local and OSHA rules
for a confined space entries.
StormTech Isolator Row (not to scale)
CATCH
BASIN
OR
INSPECTION PORT
LOCATION PER ENS
DRAWING
Examples of culvert cleaning nozzles appropriate for Isolator Row
maintenance. (These are not StormTech products.)
Maintenance is accomplished with the JetVac process.
The JetVac process utilizes a high pressure water noz-
zle to propel itself down the Isolator Row while scouring
and suspending sediments. As the nozzle is retrieved,
the captured pollutants are flushed back into the man-
hole for vacuuming. Most sewer and pipe maintenance
companies have vacuum/JetVac combination vehicles.
Selection of an appropriate JetVac nozzle will improve
maintenance efficiency. Fixed nozzles designed for cul-
verts or large diameter pipe cleaning are preferable.
Rear facing jets with an effective spread of at least 45"
are best. Most JetVac reels have 400 feet of hose allow-
ing maintenance of an Isolator Row up to 50 chambers
long. The JetVac process shall only be performed on
StormTech Isolator Rows that have AASHTO class 1
woven geotextile (as specified by StormTech) over
their angular base stone.
COVER ENTIRE ROW WITH AASHTO M288�
CLASS 2 NONWOVEN GEOTEXTILE
SC-740- 8'(2.4 m) WIDE STRIP rSTORMTI
SO310- 5')1.5 m) WIDE STRIP I ENDCAP
SC-740-24"PIPE ` WOVEN GEOTEXTILE THAT MEETS AASHTO M288 CLASS
SC-310-12"PIPE BETWEEN STONE BASE AND CHAMBERS
SC-740-5H 5 m) WIDE STRIP
SC-310-4' (1.2 m) WIDE STRIP
Call StormTech at 888.892.2694 or visit our website at www.stormtech.com for technical and product information. 3

� \jT�j" i ► (ii w� �
1I' • h
`r �• I
Detention •Retention • Recharge
Subsurface Stormwater Management"
IsolatorTMHow OW Manual
StormTech® Chamber System for Stormwater Management

1.0 'The I:��I�ator R���r
1.1 INTRODUCTION
An important component of any Stormwater Pollution
Prevention Plan is inspection and maintenance. The
StormTech Isolator Row is a patent pending technique
to inexpensively enhance Total Suspended Solids (TSS)
removal and provide easy access for inspection and
maintenance.
Looking down the Isolator Row from the manhole opening, woven
geotextile is shown between the chamber and stone base.
1.2 THE ISOLATOR" ROW
The Isolator Row is a row of StormTech chambers, either
SC-740 or SC-310 models, that Is surrounded with filter
fabric and connected to a closely located manhole for
easy access. The fabric -wrapped chambers provide for
settling and filtration of sediment as storm water rises in
the Isolator Row and ultimately passes through the filter
fabric. The open bottom chambers and perforated side -
walls allow storm water to flow both vertically and horizon-
tally out of the chambers. Sediments are captured In the
Isolator Row protecting the storage areas of the adja-
cent stone and chambers from sediment accumulation.
Two different fabrics are used for the Isolator Row. A
woven geotextile fabric is placed between the stone
and the Isolator Row chambers. The tough geotextile
provides a media for storm water filtration and provides
a durable surface for maintenance operations. It is also
designed to prevent scour of the underlying stone and
remain intact during high pressure jetting. A non -woven
fabric is placed over the chambers to provide a filter
media for flows passing through the perforations in the
sidewall of the chamber.
The Isolator Row is typically designed to capture the
'first flush" and offers the versatility to be sized on a vol-
ume basis or flow rate basis. An upstream manhole not
only provides access to the Isolator Row but typically
includes a high flow weir such that storm water flowrates
or volumes that exceed the capacity of the Isolator Row
overtop the over flow weir and discharge through a
manifold to the other chambers.
The Isolator Row may also be part of a treatment train.
By treating storm water prior to entry into the chamber
system, the service life can be extended and pollutants
such as hydrocarbons can be captured. Pre-treatment
best management practices can be as simple as deep
sump catch basins, oil -water separators or can be inno-
vative storm water treatment devices. The design of
the treatment train and selection of pretreatment devices
by the design engineer is often driven by regulatory
requirements. Whether pretreatment is used or not, the
Isolator Row is recommended by StormTech as an
effective means to minimize maintenance requirements
and maintenance costs.
Note: See the StormTech Design Manual for detailed
information on designing inlets for a StormTech system,
including the Isolator Row.
StormTech Isolator Row with Overflow Spillway
(not to scale)
OPTIONAL
PRE-TREATMENT
STORMTECH
ISOLATOR ROW
MANHOLE
WITH
OVERFLOW
WEIR
ECCENTRIC
HEADER
OPTIONAL —C_
ACCESS \ / STORMTECH CHAMBERS
2 Call StormTech at 888.892.2694 or visit our website at www.stormtech.com for technical and product information,

Soil Map —Brunswick County, North Carolina
MAP LEGEND
MAP INFORMATION
Area of Interest (AOI)
Very Stony Spot
Original soil survey map sheets were prepared at publication scale.
0it
Area of Interest (AOI)
Wet Spot
Viewing scale and printing scale, however, may vary from the
original. Please rely on the bar scale on each map sheet for proper
Soils
A
Other
map measurements.
Q
Soil Map Units
Spacial
Line Features
Source of Map: Natural Resources Conservation Service
Special
Point Features
Gully
Web Soil Survey URL: http://websoilsuNey.nrce.usda.gov
v
Blowout
Coordinate System: UTM Zone 17N
®
Borrow Pic
Short Steep Slope
This product is generated from the USDA-NRCS certified data as of
;..
Other
the version date(s) listed below.
X
Clay Spot
Political Features
Soil Survey Area: Brunswick County, North Carolina
♦
Closed Depression
Municipalities
Survey Area Data: Version 12, Feb 27, 2008
X
Gravel Pit
p
Cities
Date(s) aerial images were photographed: 3/1/1999
Gravelly Spot
Q
Urban Areas
The orthophoto or other base map on which the soil lines were
®
Landfill
water Features
compiled and digitized probably differs from the background
Oceans
imagery displayed on these maps. As a result, some minor shifting
A
Lava Flow
of map unit boundaries may be evident.
J,
Marsh
Streams and Canals
R
Mine or Quarry
Transportation
...
Rails
Oo
Miscellaneous Water
Roads
p.
Perennial Water
�y
Interstate Highways
.�
Rock Outcrop
N
US Routes
}
Saline Spot
State Highways
Sandy Spot
N
Loral Roads
Severely Eroded Spot
Other Roads
C
Sinkhole
Slide or Slip
p
Sodic Spot
a
Spoil Area
Q
Stony Spot
USDA Natural Resources Web Soil Survey 2.0 5/5/2008
21111111111 Conservation Service National Cooperative Soil Survey Page 2 of 3

Soil Map -Brunswick County, North Carolina -
Map Unit Legend
Brunswick County, North Carolina (NC019)
Map Unit Symbol
Map Unit Name
Acres in AOI
Percent of AOI
KrB
Kureb fine sand, 1 to 8 percent
slopes
2.2
100.0%
Totals for Area of Interest (AOI) 2.21 100.0
Natural Resources Web Soil Survey 2.0 5/5/2008
Conservation Service National Cooperative Soil Survey Page 3 of 3

LEGEND
z�,,,. SPECIAL FLOOD HAZARD AREAS (SFHAs) SUBJECT TO
INUNDATION BY THE 1 % ANNUAL CHANCE FLOOD
The 1 % annual chance flood (100-year flood), also known as the base flood, is the flood
that has a 1 % chance of being equaled or exceeded in any given year. The Special
Flood Hazard Area is the area subject to flooding by the 1% annual chance flood. Areas
of Special Flood Hazard include Zones A, AE, AH, AO, AR, A99, V, and VE. The Base
Flood Elevation is the water -surface elevation of the 1% annual chance flood.
ZONE A No Base Flood Elevations determined.
ZONE AE Base Flood Elevations determined.
ZONE AN Flood depths of 1 to 3 feet (usually areas of ponding); Base Flood
Elevations determined.
ZONE AO Flood depths of 1 to 3 feet (usually sheet flow on sloping terrain);
average depths determined. For areas of alluvial fan flooding, velocities
also determined.
ZONE AR Special Flood Hazard Area formerly protected from the 1% annual
chance flood by a flood control system that was subsequently
decertified. Zone AR indicates that the former flood control system is
being restored to provide protection from the 1% annual chance or
greater flood.
ZONE A99 Area to be protected from 1 % annual chance flood by a Federal
flood protection system under construction; no Base Flood Elevations
determined.
ZONE VE Coastal flood zone with velocity hazard (wave action); Base Flood Elevations
determined.
FLOODWAY AREAS IN ZONE AE
The floodway is the channel of a stream plus any adjacent floodplain areas that must be
kept free of encroachment so that the 1% annual chance flood can be carried without
substantial increases in flood heights.
OTHER FLOOD AREAS
ZONE X Areas of 0.2% annual chance flood; areas of 1% annual chance flood
with average depths of less than 1 foot or with drainage areas less than
1 square mile; and areas protected by levees from 1 % annual chance
flood.
OTHER AREAS
ZONE X Areas determined to be outside the 0.2% annual chance floodplain.
ZONE D Areas in which flood hazards are undetermined, but possible.
COASTAL BARRIER RESOURCES SYSTEM (CBRS) AREAS
\\ \ OTHERWISE PROTECIED AREAS (OPAs)
CBRS areas and OPAs are normally located within or adjacent to Special Flood Hazard Areas.
1% annual chance floodplain boundary
Z&
GRID NORTH
SCALE 10 = 500' (1 : 6,000)
0 Soo 1000
FEET
D
PANEL 2088J
FIRM
FLOOD INSURANCE RATE MAP
NORTH CAROLINA
m
ip
PANEL 2085
(SEE LOUTOB DIAGflMn OR M4P INOF.% FOR FlPM
ParEL uraun
COMNNS
WWJMry ao W. PMEt s FM
nau
rasxiL aFwcN. To OF a�
Isaa.Tooa or ass ,
I I
to
CD
rm. o roo— Tr ro
.w� t •s ore..: n. e,<r"
HE
mm
EFFECTIVE DATE MAP NUMBER
TUNE 2, 2006
�33720200\208500J
State of North Carolina
Federal Emergency Management Agency
tm ted u copy M a Op n m me amap does ncea Poop map. P
ores amendments
u I h may hme, . This map bsea not rto th changes
or a tiock. or he at may have teen made subsequent to the rate on ant
the
tine hlxk. For the latest product iMA Flood
about ore at l Floor Insurance
Program flood meta check the FEMA Floor Map Store m ww.v.msafama.grn

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APPENDIX 6
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®IMKimley-Horn
® _ ._, and Associates, Inc.
PEAK DISCHARGE ANALYSIS FOR
1 & 10 YEAR 24-HOUR STORM EVENTS
Project Information
Project Name: First Citizens Bank - 8900 E. Oak Island Dr., Oak Island, NC
KHA Project #: 011737152
Designed by: JDK Date: 5/9/2007
Revised by: KMV Date: 7/9/2007
Checked by: Date:
On -site Runoff
Drainage Area Impervious Area Weighted CN
(acres) (acres)
Pre -Development 1.32 0.387 56
Post Development 1.32 0.684 70
Volumes Provided
Routed Flows
Water Surface
Storage
Storm Event
(cfs)'
Elevation
Provided (cf)
1-year
0
14.64
1292
10-year
2.62
16.04
3080
1-Year Peak Discharge (cfs)
0.63
0.00'
10-Year Peak
Discharge (cfs)
3.60
2.62"
' Post development peak discharges are shown after being routed through underground storage system

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Job File: K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\STORMTECH DESIGN-7-3
Rain Dir: K:\RAL LDEV\OOFCB\011737152\09 Design Calculations\PondPack\
JOB TITLE
Project Date: 7/7/2008
Project Engineer: John Kuzenski
Project Title: FCB-Oak Island, NC
Project Comments:
Stormtech Design
SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Job File: K:\RAL_LDEV\OOFCB\011737152\09 Design Calculations\PondPack\STORMTECH DESIGN-7-3
Rain Dir: K:\PAL—LDEV\OOFCB\011737152\09—Design Calculations\PondPack\
WARNING MSG
WARNING......... WARNING MESSAGES ................... 1.01
MASTER SUMMARY ....*'
Watershed....... Master Network Summary ............. 2.01
****+********** NETWORK SUMMARIES (DETAILED) ***************
Watershed....... 1
Executive Summary (Nodes) .......... 3.01
Watershed....... 10
Executive Summary (Nodes) .......... 3.02
+++a+++aaa+a++++++ DESIGN STORMS SUMMARY *+*xxx++xx++++++x+a
Oak Island...... Design Storms ...................... 4.01
Oak Island...... 1
Design Storms ...................... 4.02
+++++a++++++++++++++++ TC CALCULATIONS
POST............ It Calcs ........................... 5.01
PRE ............. Tc Calcs ........................... 5.03
SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Table of Contents
i
++++a++++++++++++++x++ CN CALCULATIONS +++++++++x+++++++++++
POST............ Runoff CN-Area ..................... 6.01
PRE ............. Runoff CN-Area ..................... 6.02
++++++++++++++++++++x++ POND VOLUMES ***++++++++++++++++++a+
STORMTECH........ Vol: Elev-Volume ................... 7.01
******************** OUTLET STRUCTURES *******++++++a+++++++
Outlet 1........ Outlet Input Data .................. 8.01
+x++++aa+++a++++++a+++x POND ROUTING *****+++x+a++++a++a++++
STORMTECH....... Pond Infiltration Calcs ............ 9.01
STORMTECH INF 1
Pond Infiltration HYG .............. 9.02
STORMTECH INF 10
Pond Infiltration HYG .............. 9.07
SIN: DAYXYWJJ6M83
Bentley PondPack (10.00.023.00)
4:03 PM
Bentley Systems, Inc.
7/7/2008

Table of Contents
ii
WARNING: Kr (Reverse Flow Entrance Loss Coefficient)
Kr was set to same value as Ke= .2
Check data for..... Type: Outlet Input Data Name:
SIN: DAYXYWJJ6M83
Bentley PondPack (10.00.023.00)
4:03 PM
was not specified.
Outlet 1
Bentley Systems, Inc.
7/7/2008

Type.... WARNING MESSAGES
Name.... WARNING
Page 1.01
File.... K:\RAL-LDEV\OCFCB\011737152\09-Design Calculations\PondPack\Stormtech Design-7-3-
MASTER DESIGN STORM SUMMARY
Network Storm Collection: Oak Island
Total
Depth Rainfall
Return Event in Type RNF ID
____________ ______ ---------------- ----------------
1 4.0600 Synthetic Curve TypeIII 24hr
10 7.6400 Synthetic Curve TypeIII 24hr
MASTER NETWORK SUMMARY
SCS Unit Hydrograph Method
(`Node=Outfall; +Node=Diversion;)
(Trun= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left6Rt)
Max
Return
HYG Vol
Qpeak
Qpeak
Max WSEL
Pond Storage
Node ID
Type
Event
cu.ft Trun
min
cfs
It
cu.ft
___-_
_______
POST
__
AREA
------
1
- __
6554
727.00
________
1.86
POST
AREA
10
19867
726.00
5.69
"POST OUT
JCT
1
0
1.00
.00
'POST OUT
JCT
10
4763
730.00
2.62
PRE
AREA
1
2864
727.00
.63
PRE
AREA
10
12653
727.00
3.60
"PRE OUT
JCT
1
2864
727.00
.63
"PRE OUT
JCT
10
12653
727.00
3.60
STORMTECH
IN
POND
1
6554
727.00
1.86
STORMTECH
IN
POND
10
19B87
726.00
5.69
STORMTECH
OUT
POND
1
0
630.00
.00
14.64
1292
STORMTECH
OUT
POND
10
4763
730.00
2.62
16.04
3080
SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Type.... Master Network Summary Page 2.01
Name.... Watershed
File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
C
NETWORK SUMMARY -- NODES
(Trun.= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left 6 Rt)
DEFAULT Design Storm File,ID = Oak Island
Storm Tag Name
= 1
Data Type, File, ID
= Synthetic
_
Storm
___ - ------------
TypeIII 29hr
Storm Frequency
= 1 yr
Total Rainfall Depth=
4.0600
in
Duration Multiplier
= 1
Resulting Duration
= 1990.00
min
Resulting Start Time= .00 min
Step= 6.00
min End=
1990.00 min
HYG Vol
Qpeak
Qpeak Max WSEL
Node ID
Type
cu.ft Trun. min
cfs ft
POST
AREA
6554
727.00
1.86
Outfall POST OUT
JOT
0
1.00
.00
PRE
AREA
2869
727.00
.63
Outfall PRE OUT
JCT
2869
727.00
.63
STORMTECH IN
POND
6559
727.00
1.86
STORMTECH OUT
POND
0
630.00
.00 14.64
SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Type.... Executive Summary (Nodes) Page 3.01
Name.... Watershed Event: 1 yr
File.... K:\RAL_LDEV\00FCS\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
Storm... TypeIII 24hr Tag: 1
NETWORK SUMMARY -- NODES
(Trun.= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left 6 Rt)
DEFAULT Design Storm File,ID = Oak Island
Storm Tag Name
= 10
--------------------------------------------------------------------
Data Type, File, ID
= Synthetic
Storm
TypeIII 24hr
Storm Frequency
= 10 yr
Total Rainfall Depth=
7.6400
in
Duration Multiplier
= 1
Resulting Duration
- 1440.00
min
Resulting Start Time- .00 min
Step= 6.00
min
End=
1440.00,
min
HYG Vol
Qpeak
Qpeak
Max WSEL
Node ID
Type
cu.ft Trun.
min
cfs
ft
POST
AREA
19887
726.00
5.69
Outfall POST OUT
JCT
4763
730.00
2.62
PRE
AREA
12653
727.00
3.60
Outfall PRE OUT
JCT
12653
727.00
3.60
STORMTECH IN
POND
19887
726.00
5.69
STORMTECH OUT
POND
4763
730.00
2.62
16.04
SIN: DAYXYWJJ6M83
Bentley PondPack (10.00.023.00)
4:03 PM
Bentley Systems, Inc.
7/7/2008

Type.... Executive Summary (Nodes) Page 3.02
Name.... Watershed Event: 10 yr
File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
Storm... TypeIII 29hr Tag: 10
Title... Project Date: 7/7/2008
Project Engineer: John Kuzenski
Project Title: FCB-Oak Island, NC
Project Comments:
Stormtech Design
DESIGN STORMS SUMMARY
Design Storm File,ID =
Oak Island
Storm Tag Name = 1
______________________________________________________________________
Data Type, File, ID = Synthetic Storm TypeIII 29hr
Storm Frequency = 1 yr
Total Rainfall Depth= 4.0600 in
Duration Multiplier = 1
Resulting Duration = 1440.00 min
Resulting Start Time= .00 min Step= 6.00 min End= 1440.00 min
Storm Tag Name = 10
______________________________________-----_____-_-__
Data Type, File, ID = Synthetic Storm TypeIII 29hr
Storm Frequency = 10 yr
Total Rainfall Depth= 7.6400 in
Duration Multiplier = 1
Resulting Duration = 1990.00 min
Resulting Start Time= .00 min Step= 6.00 min End= 1990.00 min
SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Type.... Design Storms
Name.... Oak Island
Page 4.01
File.... K:\RAL-LDEV\OOFCB\011737152\09-Design Calculations\PondPack\Stormtech Design-7-3-
DESIGN STORMS SUMMARY
Design Storm File,ID = Oak Island
Storm Tag Name = 1
Data Type, File, ID = Synthetic Storm TypeIII 24hr
Storm Frequency = 1 yr
Total Rainfall Depth= 4.0600 in
Duration Multiplier = 1
Resulting Duration = 1440.00 min
Resulting Start Time= .00 min Step= 6.00 min End- 1440.00 min
Storm Tag Name = 10
---------------------------------------------------------------
Data Type, File, ID = Synthetic Storm TypeIII 24hr
Storm Frequency = 10 yr
Total Rainfall Depth= 7.6400 in
Duration Multiplier = 1
Resulting Duration = 1440.00 min
Resulting Start Time= .00 min Step= 6.00 min End= 1440.00 min
SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2006

Type.... Design Storms Page 4.02
Name.... Oak Island Event: .1 yr
File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
Storm... TypeIII 24hr Tag: 1
TIME OF CONCENTRATION CALCULATOR
................................
................................
-------------------------------
Segment 01: Tc: User Defined
S/N: DAYXYWJJ6M83
Bentley PondPack (10.00.023.00)
Segment R1 Time: 5.00 min
-------------------------------
Total Tc: 5.00 min
-------------------------
-------------------------
4:03 PM
Bentley Systems, Inc.
7/7/2008

Type.... Tc Calcs
Name.... POST
Page 5.01
File.... K:\RAL—LDEV\OOFCB\011737152\09—Design Calculations\PondPack\Stormtech Design-7-3-
---------------------------------------
Tc Equations used...
---------------------------------------
User Def.i.ned
Tc = Value entered by user
Where: Tc = Time of concentration
SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Type.... Tc Calcs Page 5.02
Name.... POST
File.... K:\PAL—LDEV\OOFCB\011737152\09—Design Calculations\PondPack\Stormtech Design-7-3-
TIME OF CONCENTRATION CALCULATOR
Segment #1: Tc: User Defined
---------------------------------
Segment #1 Time: 5.00 min
-------------------------------
Total Tc: 5.00 min
SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2006

Type.... Tc Calcs
Name.... PRE
Page 5.03
File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
Tc Equations used...
________________________________
==== User Defined
Tc = Value entered by user
Where: Tc = Time of concentration
SIN: DAYXYWJJ6M83
Bentley PondPack (10.00.023.00)
4:03 PM
Bentley Systems, Inc.
7/7/2008

Type.... Tc Calcs
Name.... PRE
Page 5.04
File.... K:\PAL—LDEV\OOFCB\011737152\09—DesigR Calculations\PondPack\Stormtech Design-7-3-
RUNOFF CURVE NUMBER DATA
..........................................................................
..........................................................................
--------------------------------------------------------------------------
Impervious
Area Adjustment Adjusted
Soil/Surface Description CN acres %C 9UC CN
Open space (Lawns,parks etc.) - Goo 39 .634 39.00
Impervious Areas - Paved parking to 98 .684 98.00
COMPOSITE AREA 6 WEIGHTED CN ---> 1.318 69.62 (70)
...........................................................................
...........................................................................
SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Type.... Runoff CN-Area
Name.... POST
Page 6.01
File.... K:\PAL-LDEV\OOFCB\011737152\09-Design Calculations\PondPack\Stormtech Design-7-3-
RUNOFF CURVE NUMBER DATA
..........................................................................
..........................................................................
Impervious
Area Adjustment Adjusted
Soil/Surface Description CN acres 8C %UC CN
-------------------------------- ------------- ----- ----- ------
Open space (Lawns,parks etc.) - Goo 39 .931 39.00
Impervious Areas - Paved parking to 98 .387 98.00
COMPOSITE AREA s WEIGHTED CN ---> 1.316 - 56.32 (56)
...........................................................................
...........................................................................
SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Type.... Runoff CN-Area
Name.... PRE
Page 6.02
File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
USER DEFINED VOLUME RATING TABLE
Elevation Volume
(ft) (cu.ft)
13.50
0
].A.
00
345
14.50
1087
15.00
1797
15.50
2458
16.00
3043
16.50
3475
17.00
3820
SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Type.... Vol: Elev-Volume
Name.... STORMTECH
Page 7.01
File.... K:\RAL-LDEV\OOFCB\011737152\09-Design Calculations\PondPack\Stormtech Design-7-3-
REQUESTED POND WS ELEVATIONS:
Min. Elev.= 13.50 ft
Increment = .10 ft
Max. Elev.= 17.00 ft
OUTLET CONNECTIVITY
---> Forward Flow Only (UpStream to DnStream)
<--- Reverse Flow Only (DnStream to UpStream)
< --- > Forward and Reverse Both Allowed
Structure
No.
Outfall
El,
ft
E2,
--------
ft
-----------------
Weir-Rectangular
----
WO
--->
-------
Cl
---------
16.100
17.000
Inlet Box
RO
--->
Cl
17.000
17.000
Orifice -Area
00
--->
cl
14.700
17.000
Culvert -Circular
Cl
--->
TW
13.500
17.000
TW SETUP, US Channel
SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Type.... Outlet Input Data
Name.... Outlet 1
Page 8.01
File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\Pond Pack\Stormtech Design-7-3-
OUTLET STRUCTURE INPUT DATA
Structure ID = WO
Structure Type = Weir -Rectangular
------------------------------------
# of Openings = 1
Crest Elev. = 16.7.0 ft
Weir Length = 4.00 ft
Weir Coeff. = 3.200000
Weir TW effects (Use adjustment equation)
Structure ID
= RO
Structure Type
= Inlet Box
------------------------------------
# of Openings
= 1
Invert Elev.
= 17.00 ft
Orifice Area
= 16.0000 sq.ft
Orifice Coeff.
_ .600
Weir Length
= 16.00 ft
Weir Coeff.
= 3.200
K, Reverse
= 1.000
Mannings n
= .0000
Kev,Charged Riser
= .000
Weir Submergence
= No
SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Type.... Outlet Input Data
Name.... Outlet 1
Page 8.02
File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
OUTLET STRUCTURE INPUT DATA
Structure ID
Structure Type
-----------------
II of Openings
Invert Elev.
Area
Top of Orifice
Datum Elev.
Orifice Coeff.
= 00
= Orifice -Area
------------------
= 1
= 14.70 ft
.4700 sq.ft
15.00 ft
14.70 ft
.600
SIN: DAYXYWJJ6MB3 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Type.... Outlet Input Data
Name.... Outlet 1
Page 8.03
OUTLET STRUCTURE INPUT DATA
Structure iD
= Cl
Structure Type
= Culvert -Circular
------------------------------------
No Barrels
= ].
Barrel Diameter
= 1.2500
ft
Upstream Invert
= 13.50
ft
Dnstream Invert
= 12.30
ft
Horiz. Length
= 55.00.ft
Barrel Length
= 55.01
ft
Barrel Slope
_ .02182
ft/ft
OUTLET CONTROL DATA...
Mannings n =
.0130
Ke =
.2000
Kb =
.023225
Kr =
.2000
HW Convergence =
.001
INLET CONTROL DATA...
Equation form =
1
Inlet Control K =
.0045
Inlet Control M =
2.0000
Inlet Control c =
.03170
Inlet Control Y =
.6900
T1 ratio (HW/D) _
.000
T2 ratio (HW/D) =
1.186
Slope Factor =
-.500
Calc inlet only =
Yes
(forward entrance loss)
(per ft of full flow)
(reverse entrance loss)
+/- ft
Use unsubmerged inlet control Form 1 equ. below T1 elev.
Use submerged inlet control Form 1 equ. above T2 elev.
In transition zone
between
unsubmerged
and submerged inlet control,
interpolate between
flows
at T1 a T2...
At T1 Elev = 13.50
ft
---> Flow =
4.80 cfs
At T2 Elev = 14.98
ft
---> Flow =
5.49 cfs
Structure ID = TW
Structure Type = TW SETUP, US Channel
------------------------------------
FREE OUTFALL CONDITIONS SPECIFIED
CONVERGENCE TOLERANCES...
Maximum Iterations= 40
Min.
TW
tolerance =
.01
ft
Max.
TW
tolerance =
.01
ft
Min.
HW
tolerance =
.01
ft
Max.
HW
tolerance =
.01
ft
Min.
Q
tolerance =
.00
cfs
Max.
Q
tolerance =
.00
cfs
SIN: DAYXYWJJ6M83
Bentley PondPack (10,00.023.00)
4:03 PM
Bentley Systems, Inc.
7/7/2008

Type.... Outlet Input Data
Name.... Outlet 1
Page 8.04
File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
INFILTRATION RATING TABLE CALCULATIONS
Infilt.(cfs) _ (10.0000 (in/hr) * Area) k Ku
Where: Ku = units conversion factor
W.S.Elev Total Area Infilt.
ft acres cf.s
No storage at this elevation... infiltration set to zero.
13.50 .0000 .00
13. 60 .0019 .02
13.70 .0076 .08
13.80 .0171 .17
13.90 .0304 .31
14.00 .0475 .48
14.10 .0522 .53
14.20 .0570 .57
14.30 .0621 .63
14.40 .0674 .68
14.50 .0729 .73
14.60 .0771 .78
14.70 .0814 .B2
14.80 .0858 .87
14.90 .0903 .91
15.00 .0950 .96
15.10 .0999 1.01
15.20 .1050 1.06
15.30 .1102 1.11
15.40 .1155 1.16
15.50 .1209 1.22
15.60 .1245 1.26
15.70 .1281 1.29
15.80 .1317 1.33
15.90 .1354 1.36
16.00 .1391 1.40
16.10 .1447 1.46
16.20 .1505 1.52
16.30 .1564 1.58
16.40 .1624 1.64
16.50 .1685 1.70
16.60 .1723 1.74
16.70 .1762 1.78
16.BO .1802 1.82
16.90 .1842 1.86
17.00 .1882 1.90
S/N: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2006

Type....
Name....
File....
Pond Infiltration Calcs
Page 9.01
STORMTECH
K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
HYG file
HYG ID - STORMTECH
INF
HYG Tag = 1
-----------------------------------
Peak Discharge =
.80
cfs
Time to Peak =
741.00
min
HYG Volume =
-----------------------------------
6543
cu.ft
HYDROGRAPH ORDINATES
(cfs)
Time
Output
Time increment
= 1.00 min
min
Time on left represents time for
first value in
each row.
---------I-------------------------------------------------------------
629.00
1 .00
.00
.00
.00
.00
634.00
1 .00
.00
.00
.00
.00
639.00
1 .00
.00
.00
.00
.00
699.00
I .00
.00
.00
.00
.00
649.00
.00
.00
.00
.00
.00
654.00
I .00
.00
.00
.00
.00
659.00
1 .00
.00
.01
.01
.01
664.00
I .01
.01
.01
.01
.01
669.00
I .01
.01
.01
.01
.01
674.00
.01
.01
.01
.01
.01
679.00
I .01
.01
.02
.02
.02
684.00
.02
.02
.02
.02
.02
689.00
1 .03
.03
.03
.04
.04
694.00
I .04
.05
.05
.05
.06
699.00
I .06
.07
.08
.09
.10
704.00
.11
.13
.14
.16
.18
709.00
I .20
.23
.25
.28
.31
714.00
.35
.39
.43
.48
.49
719.00
.50
.52
.54
.56
.58
724.00
I .60
.62
.65
.68
.70
729.00
.72
.74
.75
.76
.77
734.00
I .77
.78
.78
.79
.79
739.00
.79
.79
.80
.80
.80
799.00
I .80
.79
.79
.79
.79
749.00
1 .78
.78
.77
.77
.76
754.00
1 .75
.75
.74
.73
.72
759.00
1 .72
.71
.70
.69
.68
764.00
i .67
.67
.66
.65
.64
769.00
.64
.63
.62
.61
.61
774.00
I .60
.59
.59
.58
.57
779.00
1 .57
.56
.55
.55
.54
S/N: DAYXYWJJ6M83
Bentley PondPack (10.00.023.00)
4:03 PM
Bentley Systems, Inc.
7/7/2008

Type.... Pond Infiltration HYG Page 9.02
Name.... STORMTECH INF Tag: 1 Event: 1 yr
File.... K:\RAL_LDEV\CDFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
Storm... TypeIII 24hr Tag: 1
HYDROGRAPH
ORDINATES
(cfs)
Time
Output Time
increment
= 1.00 min
min
Time on left represents
time for
first value in
each row.
---------
784.00
I --------------------
.53
.53
----------------------------------
.52
.52
.51
789.00
.51
.50
.50
.49
.48
794.00
1
.4B
.44
.41
.38
.36
799.00
1
.31
.32
.30
.29
.28
804.00
1
.27
.27
.26
.25
.25
809.00
1
.24
.24
.23
.23
.22
814.00
.22
.22
.21
.21
.21
819.00
.21
.20
.20
.20
.20
824.00
1
.20
.19
.19
.19
.19
829.00
1
.19
.19
.18
.18
.18
834.00
1
.18
.18
.18
.18
.17
839.00
1
.17
.17
.17
.17
.17
844.00
1
.17
.17
.17
.17
.17
849.00
1
.16
.16
.16
.16
.16
854.00
1
.16
.16
.16
.16
.16
859.00
1
.16
.16
.16
.16
.15
864.00
1
.15
.15
.15
.15
.15
869.00
1
.15
.15
.15
.15
.15
874.00
1
.15
.15
.15
.15
.15
879.00
1
.15
.14
.14
.14
.14
884.00
1
.14
.14
.14
.14
.14
889.00
1
.14
.14
.14
.14
.14
894.00
1
.14
.14
.14
.13
.13
899.00
.13
.13
.13
.13
.13
904.00
.13
.13
.13
.13
.13
909.00
1
.13
.13
.13
.13
.13
914.00
1
.13
.12
.12
.12
.12
919.00
1
.12
.12
.12
.12
.12
924.00
1
.12
.12
.12
.12
.12
929.00
1
.12
.12
.12
.11
.11
934.00
1
.11
.11
.11
.11
.11
939.00
1
.11
.11
.11
.11
.11
944.00
1
.11
.11
.11
.11
.11
949.00
1
.10
.10
.10
.10
.10
954.00
1
.10
.10
.10
.10
.10
959.00
1
.10
.10
.10
.10
.10
964.00
1
.10
.09
.09
.09
.09
969.00
1
.09
.09
.09
.09
.09
974.00
1
.09
.09
.09
.09
.09
979.00
1
.09
.09
.09
.09
.09
984.00
1
.09
.09
.09
.09
.09
989.00
1
.09
.08
.08
.08
.08
994.00
1
.08
.08
.08
.08
.08
999.00
1
.08
.08
.08
.08
.08
1004.00
1
.08
.08
.08
.08
.09
SIN: DAYXYWJJ6MB3 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Type.... Pond Infiltration HYG Page 9.03
Name.... STORMTECH INF Tag: 1 Event: 1 yr
File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
Storm... TypeIII 24hr Tag: 1
HYDROGRAPH
ORDINATES
(cfs)
Time
Output Time
increment
= 1.00 min
min
I
Time on
left represents
time for
first value in
each row.
--------
1009.00
I ----------------------------------------
1
.08
.08
.08
------------
.08
.08
1014.00
1
.08
.08
.08
.08
.08
1.019.00
1
.08
.08
.08
.08
.08
1.024.00
1
.08
.08
.08
.08
.08
1029.00
1
.07
.07
.07
.07
.07
1.034.00
1
.07
.07
.07
.07
.07
1039.00
1
.07
.07
.07
.07
.07
1044.00
1
.07
.07
.07
.07
.07
1049.00
1
.07
.07
.07
.07
.07
1054.00
1
.07
.07
.07
.07
.07
1059.00
1
.07
.07
.07
.07
.07
1064.00
1
.07
.07
.07
.07
.07
1069.00
1
.07
.06
.06
.06
.06
1074.00
1
.06
.06
.06
.06
.06
1079.00
1
.06
.06
.06
.06
.06
1084.00
.06
.06
.06
.06
.06
1089.00
.06
.06
.06
.06
.06
1094.00
.06
.06
.06
.06
.06
1099.00
1
.06
.06
.06
.06
.06
1104.00
1
.06
.06
.06
.06
.06
1109.00
1
.06
.06
.06
.06
.06
1114.00
1
.06
.06
.06
.06
.06
1119.00
1
.06
.06
.05
.05
.05
1124.00
1
.05
.05
.05
.05
.05
1129.00
1
.05
.05
.05
.05
.05
1134.00
1
.05
.05
.05
.05
.05
1139.00
1
.05
.05
.05
.05
.05
1144.00
1
.05
.05
.05
.05
.05
1149.00
1
.05
.05
.05
.05
.05
1154.00
1
.05
.05
.05
.05
.05
1159.00
1
.05
.05
.05
.05
.05
1164.00
1
.05
.05
.05
.05
.05
1169.00
1
.05
.05
.05
.05
.05
1174.00
1
.05
.05
.05
.05
.05
1179.00
1
.05
.05
.05
.05
.05
1184.00
1
.05
.05
.05
.05
.05
1189.00
1
.05
.05
.05
.05
.05
1194.00
.05
.05
.05
.05
.05
1199.00
.05
.05
.05
.05
.05
1204.00
.05
.05
.05
.05
.05
1209.00
.05
.05
.05
.05
.05
1214.00
.05
.05
.05
.05
.05
1219.00
1
.05
.05
.05
.05
.05
1224.00
1
.05
.05
.05
.05
.05
1229.00
1
.05
.05
.05
.05
.05
SIN: DAYXYWJJ6M83
Bentley Systems, Inc.
Bentley PondPack (10.00.023.00)
4:03 PM
7/7/2008

Type.... Pond Infiltration HYG Page 9.04
Name.... STORMTECH INF Tag: 1 Event: 1 yr
File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
Storm... TypeIII 24hr Tag: 1
HYDROGRAPH
ORDINATES (cfs)
Time
I
Output Time
increment = 1.00
min
min
I
Time on left represents
time for first
value in
each row.
---------
1234.00
I--------------------------------------------------------------
1
.05
.05
.05
.05
.05
1239.00
1
.05
.05
.05
.05
.04
1244.00
.04
.04
.04
.04
.04
1249.00
.04
.04
.04
.04
.04
1254.00
1
.04
.04
.04
.04
.04
1259.00
1
.04
.04
.04
.04
.04
1264.00
.04
.04
.04
.04
.04
1269.00
.04
.04
.04
.04
.04
1274.00
1
.04
.04
.04
.04
.04
1279.00
1
.04
.04
.04
.04
.04
1284.00
1
.04
.04
.04
.04
.04
1289.00
1
.04
.04
.04
.04
.04
1294.00
1
.04
.04
.04
.04
.04
1299.00
1
.04
.04
.04
.04
.04
1304.00
1
.04
.04
.04
.04
.04
1309.00
1
.04
.04
.04
.04
.04
1314.00
1
.04
.04
.04
.04
.04
1319.00
1
.04
.04
.04
.04
.04
1324.00
1
.04
.04
.04
.04
.04
1329.00
1
.04
.04
.04
.04
.04
1334.00
1
.04
.04
.04
.04
.04
1339.00
1
.04
.04
.04
.04
.04
1344.00
1
.04
.04
.04
.04
.04
1349.00
1
.04
.04
.04
.04
.04
1354.00
1
.04
.04
.04
.04
.04
1359.00
1
.04
.04
.04
.04
.04
1364.00
1
.04
.04
.04
.04
.04
1369.00
1
.04
.04
.04
.04
.04
1374.00
1
.04
.04
.04
.04
.04
1379.00
1
.04
.04
.04
.04
.04
1384.00
1
.04
.04
.04
.04
.04
1389.00
1
.04
.04
.04
.04
.04
1394.00
I
.04
.04
.04
.04
..04
1399.00
1
.04
.03
.03
.03
.03
1404.00
1
.03
.03
.03
.03
.03
1409.00
1
.03
.03
.03
.03
.03
1414.00
1
.03
.03
.03
.03
.03
1419.00
1
.03
.03
.03
.03
.03
1424.00
1
.03
.03
.03
.03
.03
1429.00
1
.03
.03
.03
.03
.03
1434.00
1
.03
.03
.03
.03
.03
1439.00
1
.03
.03
.03
.03
.03
1444.00
1
.03
.03
.03
.03
.03
1449.00
1
.03
.02
.02
.02
.02
1454.00
1
.02
.02
.02
.02
.02
SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Type.... Pond Infiltration HYG Page 9.05
Name.... STORMTECH INF Tag: 1 Event: 1 yr
File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
Storm... TypeIII 24hr Tag: 1
HYDROGRAPH
ORDINATES
(cfs)
Time
Output Time
increment
= 1.00 min
min
Time on left represents
time for
first value in
each row.
---------
1459.00
I--------------------------------------------------------------
1
.02
.02
.02
.02
.02
1464.00
(
.02
.02
.02
.02
.02
1469.00
I
.02
.01
.01
.01
.01
1474.00
.01
.01
.01
.01
.01
1479.00
.01
.01
.01
.01
.01
1484.00
.01
.01
.01
.01
.01
1489.00
1
.01
.01
.01
.01
.01
1494.00
1
.01
.01
.01
.01
.01
1499.00
1
.01
.01
.01
.01
.01
1504.00
1
.01
.01
.01
.01
.01
1509.00
I
.01
.01
.01
.01
.01
1514.00
I
.01
.01
.01
.01
.01
1519.00
1
.01
.01
.01
.01
.01
1524.00
1
.01
.01
.01
.01
.01
1529.00
1
.01
.01
.01
.01
.01
1534.00
.01
.01
.00
.00
.00
1539.00
.00
.00
.00
.00
.00
1544.00
1
.00
.00
.00
.00
.00
1549.00
1
.00
.00
.00
.00
.00
1554.00
1
.00
.00
.00
.00
.00
1559.00
1
.00
.00
.00
.00
.00
1564.00
1
.00
.00
.00
SIN: DAYXYWJJ6M83
Bentley PondPack (10.00.023.00)
4:03 PM
Bentley Systems, Inc.
7/7/2008

Type.... Pond Infiltration HYG Page 9.06
Name.... STORMTECH INF Tag: 1 Event: 1 yr
File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
Storm... TypeIII 24hr Tag: 1
HYG file
HYG ID = STORMTECH
INF
HYG Tag = 10
-----------------------------------
Peak Discharge =
1.43
cfs
Time to Peak =
730.00
min
HYG Volume =
-----------------------------------
15113
cu.ft
HYDROGRAPH ORDINATES
(cfs)
Time
Output
Time increment
= 1.00 min
min
Time on left represents time for
first value in
each row.
---------I-------------------------------------------------------------
481.00
.00
.00
.00
.00
.00
486.00
1 .00
.00
.00
.00
.00
491.00
.00
.00
.00
.00
.00
496.00
.00
.00
.00
.00
.00
501.00
.00
.00
.00
.00
.00
506.00
1 .00
.00
.00
.00
.00
511-
00
1 .00
.00
.00
.00
.00
516.00
1 .00
.00
.00
.01
.01
521.00
1 .01
.01
.01
.01
.01
526.00
1 .01
.01
.01
.01
.01
531.00
1 .01
.01
.01
.01
.01
536.00
1 .01
.01
.01
.01
.01
541.00
1 .01
.01
.01
.01
.01
546.00
1 .02
.02
.02
.02
.02
551.00
1 .02
.02
.02
.02
.02
556.00
1 .02
.02
.03
.03
.03
561.00
1 .03
.03
.03
.03
.04
566.00
1 .04
.04
.04
.04
.04
571.00
1 .04
.05
.05
.05
.05
576.00
1 .05
.05
.05
.05
.06
581.00
I .06
.06
.06
.06
.06
586.00
.06
.06
.07
.07
.07
591.00
1 .07
.07
.07
.07
.07
596.00
1 .08
.08
.08
.08
.08
601.00
1 .09
.09
.09
.09
.09
606.00
I .09
.10
.10
.10
.10
611.00
I .10
.11
.11
.11
.11
616.00
1 .11
.12
.12
.12
.12
621.00
1 .12
.13
.13
.13
.13
626.00
1 .13
.14
.14
.14
.14
631.00
1 .14
.15
.15
.15
.15
SIN: DAYXYWJJ6MB3 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Type.... Pond Infiltration HYG Page 9.07
Name.... STORMTECH INF Tag: 10 Event: 10 yr
File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\Pond Pack\Stormtech Design-7-3-
Storm... TypeIII 24hr Tag: 10
HYDROGRAPH ORDINATES (cfs)
Time
Output
Time
increment
= 1.00 min
min
Time on
left represents
time for
first value in
each
row.
---------I--------------------------------------------------------------
636.00
.16
.16
.16
.16
.17
641.00
.17
.17
.17
.1.8
.18
646.00
.18
.19
.19
.19
.20
651.00
.20
.20
.20
.21
.21
656.00
1
.21
.22
.22
.22
.23
661.00
.23
.23
.24
.24
.24
666.00
.25
.25
.25
.26
.26
671.00
.27
.26
.28
.29
.29
676.00
.30
.31
.32
.33
.33
681.00
1
.34
.35
.36
.37
.38
686.00
.39
.40
.41
.41
.42
691.00
.43
.45
.46
.46
.48
696.00
1
.49
.49
.50
.50
.51
701.00
.52
.53
.55
.56
.57
706.00
.59
.61.
.63
.66
.68
711.00
.71
.74
.76
.79
.82
716.00
.85
.89
.92
.97
1.02
721.00
1.08
1.13
1.19
1.24
1.27
726.00
1
1.31
1.35
1.38
1.41
1.43
731.00
1.43
1.41.
1.40
1.38
1.37
736.00
1.35
1.33
1.31
1.29
1.26
741.00
1.26
1.24
1.21
1.19
1.16
746.00
1.13
1.10
1.08
1.05
1.02
751.00
1
1.00
.97
.95
.93
.92
756.00
1
.90
.89
.88
.87
.86
761.00
1
.85
.85
.84
.84
.84
766.00
1
.83
.83
.83
.83
.82
771.00
1
.62
.82
.82
.82
.81
776.00
1
.Bl
.81
.81
.80
.80
781.00
1
.80
.79
.79
.79
.78
786.00
1
.78
.77
.77
.77
.76
791.00
.76
.76
.75
.75
.75
796.00
.74
.74
.74
.73
.73
801.00
.72
.72
.71
.71
.71
806.00
.70
.70
.69
.69
.68
811.00
1
.68
.66
.67
.67
.67
816.00
1
.66
.66
.65
.65
.65
821.
00 1
.64
.64
.64
.63
.63
826.00
.62
.62
.62
.61
.61
831.00
.61
.60
.60
.60
.39
836.00
1
.59
.59
.58
.58
.58
841.00
1
.57
.57
.57
.56
.56
846.00
1
.56
.55
.55
.55
.54
851.00
1
.54
.54
.54
.53
.53
856.00
1
.53
.52
.52
.52
.52
S/N: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Type.... Pond Infiltration HYG
Page 9.08
Name.... STORMTECH INF Tag: 10 Event: 10 yr
File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
Storm... TypeIII 24hr Tag: 10
HYDROGRAPH ORDINATES (cfs)
Time I
Output Time
increment
= 1.00 min
min
Time on left represents
time for
first value in
each row.
---------I----------------------------------------------------------
861.00
1
.51.
.51
.51
.51
.50
866.00
.50
.50
.50
.49
.49
871.00
.49
.49
.48
.48
.47
876.00
1
.45
.44
.43
.42
.41
881.00
1
.40
.39
.38
.38
.37
886.00
1
.37
.36
.36
.36
.35
691.00
1
.35
.35
.34
.34
.34
896.00
1
.34
.33
.33
.33
.33
901.00
1
.33
.33
.32
.32
.32
906.00
1
.32
.32
.31
.31
.31
911.00
1
.31
.31
.31
.31
.30
916.00
1
.30
.30
.30
.30
.30
921.00
1
.30
.29
.29
.29
.29
926.00
1
.29
.29
.29
.28
.28
931.00
1
.28
.28
.28
.28
.28
936.00
1
.27
.27
.27
.27
.27
941.00
1
.27
.26
.26
.26
.26
946.00
1
.26
.26
.26
.25
.25
951.00
1
.25
.25
.25
.25
.24
956.00
1
.24
.24
.24
.24
.24
961.00
1
.24
.23
.23
.23
.23
966.00
1
.23
.23
.23
.22
.22
971.00
.22
.22
.22
.22
.22
976.00
.22
.22
.22
.21
.21
981.00
1
.21
.21
.21
.21
.21
986.00
1
.21
.21
.21
.21
.21
991.00
1
.21
.20
.20
.20
.20
996.00
1
.20
.20
.20
.20
.20
1001.00
1
.20
.20
.20
.20
.20
1006.00
.20
.19
.19
.19
.19
1011.00
.19
.19
.19
.19
.19
1016.00
.19
.19
.19
.19
.19
1021.00
.18
.18
.18
.18
.18
1026.00
1
.18
.18
.18
.18
.18
1031.00
1
.18
.18
.18
.18
.18
1036.00
1
.17
.17
.17
.17
.17
1041.00
1
.17
.17
.17
.17
.17
1046.00
1
.17
.17
.17
.17
.17
1051.00
1
.17
.17
.16
.16
.16
1056.00
1
.16
.16
.16
.16
.16
1061.00
1
.16
.16
.16
.16
.16
1066.00
1
.16
.16
.15
.15
.15
1071.00
.15
.15
.15
.15
.15
1076.00
.15
.15
.15
.15
.15
1081.00
1
.15
.15
.14
.14
.14
SIN: DAYXYWJJ6M83
Bentley PondPack (10.00.023.00)
4:03 PM
Bentley Systems, Inc.
7/7/2008

Type.... Pond Infiltration HYG
Name.... STORMTECH INF Tag: 10
Page 9.09
Event: 10 yr
File.... K:\RAL-LDEV\OOFCB\011737152\09-Desi.gn Calculations \Pond Pack\Stormtech Design-7-3-
Storm... TypeIII 24hr Tag: 10
HYDROGRAPH
ORDINATES
(cfs)
Time
I
Output Time
increment
= 1.00 min
min
Time on
left represents
time for
first value in
each row.
---------I-------------------
1086.00
1
.14
-----------------------------------------
.14
.14
.14
.14
1091.00
1
.14
.14
.14
.14
.14
1096.00
1
.14
.14
.14
.14
.14
1101.00
1
.14
.14
.14
.13
.13
1106.00
1
.13
.13
.13
.13
.13
..11,11.00
1
.13
.13
.13
.13
.13
1116.00
.13
.13
.13
.13
.13
1121.00
.13
.13
.13
.13
.13
1126.00
1
.13
.13
.13
.13
.13
1131.00
i
.13
.13
.13
.13
.13
1136.00
1
.13
.13
.13
.13
.13
11.41.00
1
.13
.13
.13
.13
.13
1146.00
1
.13
.13
.12
.12
.12
1151.00
.12
.12
.12
.12
.12
1156.00
.12
.12
.12
.12
.12
1161.00
.12
.12
.12
.12
.12
1166.00
1
.12
.12
.12
.12
.12
1171.00
.12
.12
.12
.12
.12
1176.00
.12
.12
.12
.12
.12
1181.00
.12
.12
.12
.12
.12
1186.00
.12
.12
.12
.12
.12
1191.00
.12
.12
.12
.12
.12
1196.00
.12
.11
.11
.11
.11
1201.00
.11
.11
.11
.11
.11
1206.00
.11
.11
.11
.11
.11
1211.00
1
.11
.11
.11
.11
.11
1216.00
1
.11
.11
.11
.11
.11
1221.00
1
.11
.11
.11
.11
.11
1226.00
1
.11
.11
.11
.11
.11
1231.00
1
.11
.11
.11
.11
.11
1236.00
1
.11
.11
.11
.11
.11
1241.00
.11
.11
.11
.11
.11
1246.00
.11
.11
.11
.11
.11
1251.00
.11
.11
.11
.11
.10
1256.00
.10
.10
.10
.10
.10
1261.00
.10
.10
.10
.10
.10
1266.00
.10
.10
.10
.10
.10
1271.00
.10
.10
.10
.10
.10
1276.00
.10
.10
.10
.10
.10
1291.00
.10
.10
.10
.10
.10
1286.00
I
.10
.10
.10
.10
.10
1291.00
.10
.10
.10
.10
.10
1296.00
I
.10
.10
.10
.10
.10
1301.00
I
.10
.10
.10
.10
.10
1306.00
.10
.10
.10
.10
.10
SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Type.... Pond Infiltration HYG Page 9.10
Name.... STORMTECH INF Tag: 10 Event: 10 yr
File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\Pond Pack\Stormtech Design-7-3-
Storm... TypeIII 24hr Tag: 10
HYDROGRAPH
ORDINATES
(cfs)
Time
I
Output Time
increment
= 1.00 min
min I
Time on
left represents
time for
first value in each
row.
---------
1311.00
I______________________________________________________________
1
.10
.10
.10
.10
.10
1316.00
1
.10
.10
.10
.1.0
.09
1321.00
1
.09
.09
.09
.09
.09
1326.00
1
.09
.09
.09
.09
.09
1331.00
.09
.09
.09
.09
.09
1336.00
.09
.09
.09
.09
.09
1341.00
.09
.09
.09
.09
.09
1346.00
1
.09
.09
.09
.09
.09
1351.00
1
.09
.09
.09
.09
.09
1356.00
1
.09
.09
.09
.09
.09
1361.00
.09
.09
.09
.09
.09
1366.00
.09
.09
.09
.09
.09
1371.00
1
.09
.09
.09
.09
.09
1376.00
1
.09
.09
.09
.09
.09
1381.00
1
.09
.09
.08
.08
.08
1386.00
1
.08
.08
.08
.08
.08
1391-
00 1
.08
.08
.08
.08
.08
1396.00
1
.08
.08
.08
.08
.08
1401..00
.08
.08
.08
.08
.08
1406.00
.08
.08
.08
.08
.08
1411.00
.08
.08
.08
.08
.08
1416.00
.08
.08
.08
.08
.08
1421.00
1
.08
.08
.08
.08
.08
1426.00
1
.08
.08
.08
.08
.08
1431.00
1
.08
.08
.08
.08
.08
1436.00
1
.08
.06
.08
.08
.08
1441.00
1
.08
.08
.07
.07
.07
1446.00
.07
.06
.06
.06
.06
1451.00
.05
.05
.05
.05
.04
1456.00
1
.04
.04
.04
.04
.03
1461.00
.03
.03
.03
.03
.03
1466.00
.03
.02
.02
.02
.02
1471.00
.02
.02
.02
.02
.02
1476.00
1
.02
.02
.02
.02
.02
1481.00
1
.02
.02
.02
.02
.02
1486.00
1
.02
.01
.01
.01
.01
1491.00
1
.01
.01
.01
.01
.01
1496.00
1
.01
.01
.01
.01
.01
1501.00
1
.01
.01
.01
.01
.01
1506.00
1
.01
.01
.01
.01
.01
1511.00
1
.01
.01
.01
.01
.01
1516.00
1
.01
.01
.01
.01
.01
1521.00
1
.01
.01
.01
.01
.01
1526.00
.01
.01
.01
.01
.01
1531.00
I
.01
.01
.01
.01
.01
S/N: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Type.... Pond Infiltration HYG Page 9.11
Name.... STORMTECH INF Tag: 10 Event: 10 yr
File.... K:\PAL-LDEV\OOFCB\011737152\09-Design Calculations\PondPack\Stormtech Design-7-3-
HYDROGRAPH ORDINATES
(cfs)
Time I
Output Time
increment
= 1.00 min
min
I
Time on left represents
time for
first value in
each row.
--------
1536.00
I-------------------------------------------------------------
1
.01
.01
.01
.01
.01
1541.00
1
.01
_01
.01
.01
.01
1546.00
1
.01
.01
.0"L
.01
.01
1551.00
1
.01
.01
.00
.00
.00
1556.00
1
.00
.00
.00
.00
.00
1561.00
1
.00
.00
.00
.00
.00
1566.00
1
.00
.00
.00
.00
.00
1571.00
1
.00
.00
.00
.00
.00
1576.00
1
.00
.00
.00
.00
.00
1581.00
1
.00
.00
.00
SIN: DAYXYWJJ6M83 Bentley Systems, Inc.
Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008

Type.... Pond Infiltration HYG Page 9.12
Name.... STORMTECH INF Tag: 10 Event: 10 yr
File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3-
---- 0 -----
Oak Island... 4.01, 4.02
Outlet 1... 8.01
P -----
POST ... 5.01, 6.01
PRE... 5.03, 6.02
----- S -----
STORMTECH... 7.01, 9.01
STORMTECH INF 1... 9.02, 9.07
----- W -----
WARNING... 1.01
Watershed... 2.01, 3.01, 3.02
S/N: DAYXYWJJ6M83
Bentley PondPack (10.00.023.00)
4:03 PM
Bentley Systems, Inc.
7/7/2008

Number of chambers - 51
Voids in the stone (porosity) - 0.40
Base of Stone Elevation - .13.50,
StormTech SC 740 Incremental Storage Volumes
StormTech-
oater Management'
ent
Subsurface Stormwater Management`
Height of
System (in)
Incremental
Chamber (fta)
Incremental
Stone (fta)
Incremental
Ch & St (ft3)
Cumulative
Chamber (fta)
Cumulative
System (ft)
Elevation
42
0
1.13
1.13
74.90
3820
17.00
41
0
1.13
1.13
73.77
3762
16.92
40
0
1.13
1.13
72.64
3705
16.83
39
0
1.13
1.13
71.52
3647
16.75
38
0
1.13
1.13
70.39
3590
16.67
37
0
1.13
1.13
69.26
3532
16.58
36
0.05
1.10
1.16
68.14
3475
16.50
35
0.16
1.06
1.22
66.98
3416
16.42
34
0.28
1.01
1.30
65.75
3353
16.33
33
0.60
0.89
1.49
64.46
3287
16.25
32
0.80
0.81
1.61
62.97
3211
16.17
31
0.95
0.75
1.70
61.36
3129
16.08
30
1.07
0.70
1.77
59.66
3043
16.00
29
1.18
0.65
1.84
57.89
2952
15.92
28
1.27
0.62
1.89
56.05
2859
15.83
27
1.36
0.58
1.94
54.17
2763
15.75
26
1.45
0.55
2.00
52.23
2664
15.67
25
1.52
0.52
2.04
50.23
2562
15.58
24
1.58
0.49
2.08
48.19
2458
15.50
23
1.64
0.47
2.11
46.11
2352
15.42
22
1.70
0.45
2.15
44.00
2244
15.33
21
1.75
0.43
2.18
41.85
2134
15.25
20
1.80
0.41
2.21
39.67
2023
15.17
19
1.85
0.38
2.24
37.47
1911
15.08
18
1.89
0.37
2.26
35.23
1797
15.00
17
1.93
0.35
2.29
32.96
1681
14.92
16
1.97
0.34
2.31
30.6E
1564
14.83
15
2.01
0.32
2.33
28.36
1447
14.75
14
2.04
0.31
2.35
26.03
1328
14.67
13
2.07
0.30
2.37
23.68
1208
14.58
12
2.10
0.28
2.39
21.31
1087
14.50
11
2.13
0.27
2.41
18.92
965
14.42
10
2.15
0.27
2.42
16.51
842
14.33
9
2.18
0.26
2.43
14.09
719
14.25
8
2.20
0.25
2.45
11.66
595
14.17
7
2.21
0.24
2.45
9.21
470
14.08
6
0
1.13
1.13
6.76
345
14.00
5
0
1.13
1.13
5.63
287
13.92
4
0
1.13
1.13
4.51
230
13.83
3
0
1.13
1.13
3.38
172
13.75
2
0
1.13
1.13
2.25
115
13.67
1
0
1.13
1 1.13
1 1.13
57
13.58
Total Chamber Storage = 45.9 ft'
Corporate Office
20 Beaver Road Wethersfield, CT 06109 (888)-892-2694 Fax [phone]

{
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•
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K •.

Town of Oak Island
Stormwater Management Plan for Commercial Development
Supplemental Form
Name of Owner (Applicant): jiytS,Y Ckl'I-LENS 1 NOK
Name of Contact Person: M i r dq C t_ p g21<C to Telephone: (A&I 1- 4 03 p
Name of Development: _rj9,5 cgT -Lco5 T5 "r —,
LOCalion/ParcelID: 8gw3 cps-T oqk tSW,-1D vk%vE
Refer to Code of Ordinances, Town of Oak Island, North Carolina, Chapter 18, Article V
for required contents of stormwater management plans for commercial development..
Refer to the Brunswick County Stormwater Management Manual
(http://www.brunswickcountync.gov/Portals/O/bcfiles/Storm_ Water _Manual.pdo for
guidance and specifications for preparing a stormwater management plan. For design
and engineering specifications not currently addressed in the Brunswick County Manual,
refer to the State BMP Manual (http://h2o.enr.state.nc.us/su/bmp_manual.htm).
• The first 1.5 inches of runoff from impervious surfaces shall be retained on the site of the
development. Describe stormwater system to meet this requirement.
Volume of 1.5 inches runoff: 3'1 41 CF STo7-MTgGy DES1(�tJ = 38zo cF
Calculate Pre- and Post -Development Peak Runoff for Design Storms
Pre -development peak runoff O. b 3 cfs (1-year, 24-hour storm)
Post -development peak runoff_ 0.00 _ cfs (I -year, 24-hour storm)
If post -development peak flow exceeds predevelopment peak flow, describe proposed flow
control BMP.
Pre -development peak runoff 3 . tov _ cfs (10-year, 24-hour storm)
Post -development peak runoff_ 2.62 _ cfs (10-year, 24-hour storm)
If post -development peak flow exceeds predevelopment peak flow, describe proposed flow
control BMP.

Brunswick County, North Carolina
Pollutant Export Calculations
Pre -Development Conditions Form (5w-004)
Step 1: Determine appropriate codes for each type of lend use and management from Table 6.1 and enter in Column 1.
Step 2: Determine the area for each type of land use and management and enter in Column 2.
Step 3: Enter the pollutant export coefficients from Table 6.1 for each land use type in columns 3, 5, 7, and 9.
Step 4. Multiply each area in Column 2 by the export coefficients and enter in columns 4, 6, 8, and 10.
Step 5. Sum columns 4, 6, 8, and 10.
II currently a residential development enter average lot size:
TP Ex

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Brunswick County, North Carolina
Pollutant Export Calculations
Post -Development Condltlons Form (SW-005)
Step 1: Determine appropriate codes for each type of land use and management from Table 6.1 and enter In Column 1.
Step 2: Determine the area for each type of land use and management and enter in Column 2.
Step 3: Enter the pollutant export coefficients from Table 6.1 for each land use type in columns 3, 5, 7, and 9.
Step 4. Multiply each area in Column 2 by the export coefficients and enter in columns 4, 6, 8, and 10.
Step 5. Sum columns 4, 6, 8, and 10,
- i1 residential develooment enter average lot size: -71
tc�
a[w OW=
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&MP ExPp�T ROIAUIOQ FAcToR5 LITILI2ED PER TABS[ 8,a.b
(TN-aolb, l`-50%, i55-8070, CDLIFORM-`{Dgo)

P11111111M Kimley-Horn
and Associates, Inc.
Project Information
Stormtech Water Quality Calculations
Project Name: First Citizens Bank
KHA Project #: 011737152
Designed by: JDK Date: 5/92008
Revised by: MCP Date: 7/3/2008
Checked by: PAB Date: 5/912008
Design Resource: NCDENR - Slormwater Best Management Practices (April 1999)
NCDENR - Updated Draft Manual of Slormwater Best Management Practices ( July 2005)
Site Information
Sub Area Location:
Site
Drainage Area (DA) =
1.32
Acres
Impervious Area (IA) =
0.69
Acres
Percent Impervious (1) =
52.3
%
Required Storage Volume (Water Quality):
Design Storm =
1.5
inch
Determine Rv Value =
0.05 +.009 (1) = 0.52 inAn
Storage Volume Required =
3,741
cf
Summary of Proposed BMP
Base of Stone Elevation =
13.50
it
Base of Chamber Elevation =
14.00
it
Top of Chamber Elevation =
16.50
it
Top of Stone Elevation =
17.00
Volume of Individual Chamber =
74.90
—it
cf
Number of Chambers =
51
cf
Provided Water Quality Volume
3,820
cf (Required Volume = 3741 )

C = " ICwiry Na
raGAssmialea.lm
Proposed RETENTION Volumes
Water Quality Volume
Water Quality Volume for 1.5' Rainfall required = 3,741
Incremental Accumulated
Elevation Volume Volume, S Stage, Z
cu It cu ft ft
13.50
0
0
0.00
14.00
345
345
0.50
14.50
742
1,087
1.00
15.00
710
1,797
1.50
15.50
661
2,458
2.00
16.00
585
3,043
2.50
16.50
432
3,475
3.00
17.00
345
3,820
3.50
7/7/2008 Stonntech-WQ 03 July 08.xlsx 1 of 1

APPENDIX
;s
r�
o :y.
.ls
1
• 1 .. ) .\�
.ice_

Profile
Scenario: Base
Profile: Profile - 1
Scenario: Base
mCo
M
+
E
o o.
Sm>E
20.00
0+00
18.00
16.00 Elevation (ft)
14.00
1200.
0+50
Station (ft)
Title: First Citizens Bank Project Engineer: John Kuzenski
k:\._\09_design calculations12008-7-15.stm StormCAD v5.6 (05.06.012.001
07/15/08 05:10:28 PM 0 Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA -1-203-755-1666 Page 1 of 1

Profile
Scenario: Base
Profile: Profile - 2
Scenario: Base
t�.Q_ �­E
i o E(n c¢va
l
I
I
__—
—16512
—.— 15v
4200h
15 ch
COuve
@S=0.�2424
Wh
I
Concrete
=0.002381 W1t
t
!
0,00 0.25 0,50 0.75 1-00 1-25 1.50
Swim ihi
1,75 2.00
20.110
18.00
16.00 Elevakn(h)
t4.00
12,00
2-25
Title: First Citizens Bank Project Engineer: John Kuzenski
kA—\09_design calculalions\2008-7-15.stm StormCAD v5.6 [05.06.012.001
07/15/08 05: 14:47 PM 0 Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA [phone] Page 1 of 1

a
1
i
3

THE INSTALLED CHAMBER SYSTEM SHALL PROVIDE
THE LOAD FACTORS SPECIFIED IN THE AASHTO LRFD
BRIDGE DESIGN SPECIFICATIONS SECTION 12.12 FOR
EARTH AND LIVE LOADS, WITH CONSIDERATION FOR
IMPACT AND MULTIPLE VEHICLE PRESENCES.
SC-740 CHAMBER
'i. - 2 INCH CLEAN,
CRUSHED. ANGULAR STONE
ADS 601 GEOTEXTILE OR EQUAL
DESIGN ENGINEER IS RESPONSIBLE FOR
ENSURING THE REQUIRED BEARING
CAPACITY OF SUBGRADE SOILS'
CHAMBERS SHALL MEET ASTM F 2418-05 "STANDARD
SPECIFICATION FOR POLYPROPYLENE (PP) CORRUGATED
WALL STORMWATER COLLECTION CHAMBERS".
GRANULAR WELL GRADED SOILl.AGGREGATE MIXTURES.
<35% FINES. COMPACT IN 6 IN LIFTS TO 95% PROCTOR DENSITY.
SEE THE TABLE OF ACCEPTABLE FILL MATERIALS.
SC-740 END CAP
PAVEMENT
UNPAVED INSTALLATION WHERE
"ING FROM VEHICLES MAY OCCUR,
EASE COVER TO 2x INCHES
MIN.
THIS CROSS SECTION DETAILS THE REQUIREMENTS
NECESSARY TO SATISFY THE LOAD FACTORS SPECIFIED IN THE
AASHTO LRFD BRIDGE DESIGN SPECIFICATIONS SECTION 12.12
FOR EARTH AND LIVE LOADS USING STORMTECH CHAMBERS
THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE A BED
LAYOUT THAT WILL HANDLE THE DESIGN VOLUME LISTED ABOVE. THE SIZING. FIT AND
APPLICABILITY OF THE STORMTECH CHAMBER SYSTEM FOR THIS SPECIFIC PROJECT HAS
NOT BEEN DETERMINED. IT IS THE ULTIMATE RESPONSIBILITY OF THE DESIGN ENGINEER TO
FOR STORMTECH INFORMATION
ASSURE THAT THE STORM WATER SYSTEM DESIGN IS IN FULL COMPLIANCE WITH ALL
APPLICABLE LAWS AND REGULATIONS. STORMTECH PRODUCTS MUST BE DESIGNED AND
CALL 1-888-892-2694
INSTALLED IN ACCORDANCE WITH STORMTECHS MINIMUM REQUIREMENTS. STORMTECH LLC
DOES NOT APPROVE PLANS. SIZING, OR SYSTEM DESIGNS. THE DESIGN ENGINEER IS
RESPONSIBLE FOR ALL DESIGN DECISIONS.
'SEE STORMTECH DESIGN MANUAL
6" MIN.
DEPTH OF STONE
_TO BE DETERMINED
BY DESIGN ENGINEER
6" MIN.'
12" MIN. TYP.
NOTE: CHAMBER SYSTEM DESIGN MUST BE IN
ACCORDANCE WITH STORMTECH DESIGN MANI
,�A 20 Beaver Road. Suite 104
�:(t�i, Wethersfield. CT 06109
892-2694
�m��• Phone: 28-8401
Fax: [phone]
sUb,,xt.c< sI,xTv Pi¢l MOIgQ¢m¢Ill' vvY Stornnteah.aom
STORMTECH SC-740 CROSS SECTION
SCALE: NITS CHECKED
DATE: 11/01/2005 "CAD No.
DRAWN BY: SHEET

INSPECTION PORT
BY DESIGN ENGINEER
1 WOVEN GEOTEXTILE OR EQUAL,
)N STONE AND CHAMBERS
SC-740--5'-6' WIDE STRIP
SC-310-4' WIDE STRIP
STORMTECH LLC CONCEPTUAL PLAN DISCLAIMER
THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE
A BED LAYOUT THAT WILL HANDLE THE DESIGN VOLUME LISTED ABOVE. THE
SIZING, FIT AND APPLICABILITY OF THE STORMTECH CHAMBER SYSTEM FOR THIS
SPECIFIC PROJECT HAS NOT BEEN DETERMINED, IT IS THE ULTIMATE
RESPONSIBILITY OF THE DESIGN ENGINEER TO ASSURE THAT THE STORMWATER
SYSTEM DESIGN IS IN FULL COMPLIANCE WITH ALL APPLICABLE LAWS AND
REGULATIONS. STORMTECH PRODUCTS MUST BE DESIGNED AND INSTALLED IN
ACCORDANCE WITH STORMTECH'S MINIMUM REQUIREMENTS. STORMTECH LLC
DOES NOT APPROVE PLANS, SIZING, OR SYSTEM DESIGNS. THE DESIGN ENGINEER
IS RESPONSIBLE FOR ALL DESIGN DECISIONS,
COVER ENTIRE ROW WITH
AASHTO M288 CLASS 2 NON -WOVEN
GEOTEXTILE OR EQUAL
SC-740--8' WIDE STRIP
SC-310--5' WIDE STRIP
STORMTECH ENDCAP
FOR STORMTECH INFORMATION
CALL 1-888-892-2694
NOTE: CHAMBER SYSTEM DESIGN MUST BE IN
ACCORDANCE WITH STORMTECH DESIGN MANUAL
20 Beaver Road, Suite 104
Wethersfield, CT 06109
St0rmTUb1T
Phone: [phone]
Fax: [phone]
me�ro�e s:wm..c:er Mcfweamem'
WWW.stornntech.conn
ISOLATOR ROW
PROFILE VIEW
SCALE: NTS
CHECKED
DATE: 1110112005
ACAD N0.
DRAWN DY: I
SHEET OF

FOR STORMTECH INFORMATION
CALL 1-888-892-2694
PERFORATED
UNDERDRAIN PIPE
STORMTECH CHAMBER
FOUNDATION STONE
BENEATH CHAMBER
ADS 601 GEOTEXTILE
OR EQUAL
4x PIPE 0 MIN
crnolviTECH CHAMBER
OUNDATION STONE
3ENEATH CHAMBER
GEOTEXTILE
OR EQUAL
x PIPE 0 MIN
DING UNDER
DRAINAGE PIPE (PER DESIGN)
SECTION A_A
STONE BEDDING UNDER
DRAINAGE PIPE (PER DESIGN)
TO OUTLET CONTROL
STRUCTURE
SECTION B_B
STORMTECH LLC CONCEPTUAL PLAN DISCLAIMER
THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE
A BED LAYOUT THAT WILL HANDLE THE DESIGN VOLUME LISTED ABOVE. THE
SIZING, FIT AND APPLICABILITY OF THE STORMTECH CHAMBER SYSTEM FOR THIS
SPECIFIC PROJECT HAS NOT BEEN DETERMINED. IT IS THE ULTIMATE
RESPONSIBILITY OF THE DESIGN ENGINEER TO ASSURE THAT THE STORMWATER
SYSTEM DESIGN IS IN FULL COMPLIANCE WITH ALL APPLICABLE LAWS AND
REGULATIONS. STORMTECH PRODUCTS MUST BE DESIGNED AND INSTALLED IN
ACCORDANCE WITH STORMTECHS MINIMUM REQUIREMENTS. STORMTECH LLC
DOES NOT APPROVE PLANS. SIZING, OR SYSTEM DESIGNS. THE DESIGN ENGINEER
IS RESPONSIBLE FOR ALL DESIGN DECISIONS.
PERFORATED
UNDERDRAIN PIPE
' NOTE: CHAMBER SYSTEM DESIGN MUST BE IN
ACCORDANCE WITH STORMTECH DESIGN MANUAL
AAA 20 Beaver Road. Suite 104
�y,,�+ E`,�t3�71 Wethersfield. CT 06109
�7{.onli r�• Phone: 88S-892-2694
Fax: [phone]
5Vb,u CCe SIG.. Fll w .slormtech.Cam
UNDERDRAIN DETAIL
SCALE: NTS CHECK
Date: 11/01/2005 ACAD
DRAWN GY: SHEET

PAVEMENT
4" PVC RISER
SC-740 CHAM
AASHTO M288 CLASS 2
NON -WOVEN GEOTEXTILE
FOR STORMTECH INFORMATION
CALL 1-888-892-2694
FLOOR BOX FRAME AND LID W/S.S.
CAP SCREW LID CLOSURE
INSPECTION PORT WITH SCREW -IN CAP
CLASS "C" CONCRETE
AASHTO M288 CLASS 2
FNON-WOVEN GEOTEXTILE
MIN. MAX.
14,4 ; INSPECTION PORT TO BE
ATTACHED THROUGH
rrrKNOCK-OUT LOCATED
AT CENTER OF CHAMBER
STORMTECH LLC CONCEPTUAL PLAN DISCLAIMER
THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE
A BED LAYOUT THAT WILL HANDLE THE DESIGN VOLUME LISTED ABOVE. THE
SIZING, FIT AND APPLICABILITY OF THE STORMTECH CHAMBER SYSTEM FOR THIS
SPECIFIC PROJECT HAS NOT BEEN DETERMINED. IT IS THE ULTIMATE
RESPONSIBILITY OF THE DESIGN ENGINEER TO ASSURE THAT THE STORMWATER
SYSTEM DESIGN ISIN'FULL COMPLIANCE WITH ALL APPLICABLE LAWS AND
REGULATIONS. STORMTECH PRODUCTS MUST BE DESIGNED AND INSTALLED IN
ACCORDANCE WITH STORMTECH'S MINIMUM REQUIREMENTS. STORMTECH LLC
DOES NOT APPROVE PLANS, SIZING, OR SYSTEM DESIGNS. THE DESIGN ENGINEER
IS RESPONSIBLE FOR ALL DESIGN DECISIONS.
NOTE: CHAMBER SYSTEM DESIGN MUST BE IN
ACCORDANCE WITH STORMTECH DESIGN MANUAL
A41 20 Beaver Road, Suite 104
Wethersfield, CT 06109
�•'h. Phone: [phone]
Fax: [phone]
seaxmc=s:am.d«Marocemenr wvw.stormtech.com
SC-7LO INSPECTION PORT DETAIL
SCALE: NTS I CHECKED
E Y:
OF

ACCEPTABLE FILL MATERIALS
STORMTECH SC-310 AND SC-740 CHAMBER SYSTEMS
a - _.-
'MATERIAL`LOCATiON -
DESCRIPTION -
AASHTO M43
".AASHiO.M745
COMPACTION/DENSITY -
:.•;,
DESIGNATION
DESIGNATION.
REQUIREMENT
QD FILL MATERIAL FROM 18"
ANY SOIL/ROCK MATERIALS, NATIVE
N/A
NIA
PREPARE PER ENGINEER'S PLANS. PAVED
TO GRADE ABOVE CHAMBERS
SOILS OR PER ENGINEER'S PLANS.
INSTALLATIONS MAY HAVE STRINGENT MATERIAL
CHECK PLANS FOR PAVEMENT
AND PREPARATION REQUIREMENTS.
SUBGRADE REQUIREMENTS.
© FILL MATERIAL FOR 6' TO 18"
GRANULAR WELL -GRADED
3, 357, 4, 467,
A-1
COMPACT IN 6" LIFTS TO A MINIMUM 95%
ELEVATION ABOVE CHAMBERS
SOIL/AGGREGATE MIXTURES,
5, 56. 57, 6,
A-2
STANDARD PROCTOR DENSITY. ROLLER GROSS
(24' FOR UNPAVED INSTALLATIONS)
<35% FINES.
67.68.7.78,
A-3
VEHICLE WEIGHT NOT TO EXCEED 12.000 LBS.
8, 89.9. 10
DYNAMIC FORCE NOT TO EXCEED 20,000 LBS.
BO EMBEDMENT STONE SURROUNDING
CLEAN ANGULAR STONE WITH THE
3, 357, 4, 4fi7, 5,
N/A
NO COMPACTION REQUIRED
AND TO A 6' ELEVATION ABOVE
MAJORITY OF PARTICLES BETWEEN
56. 57
CHAMBERS
%- 2 INCH
OA FOUNDATION STONE BELOW
CLEAN ANGULAR STONE WITH THE
3, 357. 4, 4fi7,
N/A
PLATE COMPACT OR ROLL TO ACHIEVE A
CHAMBERS
MAJORITY OF PARTICLES BETWEEN
5. 56, 57
95% STANDARD PROCTOR DENSI T Y
%- 2INCH
PLEASE NOTE: THE LISTED AASHTO DESIGNATIONS ARE FOR GRADATIONS ONLY. THE STONE MUST ALSO BE CLEAN
CRUSHED ANGULAR. FOR EXAMPLE, THE STONE MUST BE SPECIFIED AS CLEAN, CRUSHED, ANGULAR NO.4 STONE.
AASHTO M286 CLASS 2
NON -WOVEN GEOTEXTILE
ALL AROUND ANGULAR STONE
_ MAX.
,jG•,C �h 18 MIN.
I 6" MIN.
O c
DEPTH OF STONE
A TO BE DETERMINED
BY DESIGN ENGINEER
B" MiN
STORMTECH LLC CONCEPTUAL PLAN DISCLAIMER
THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE
A BED LAYOUT THAT WILL HANDLE THE DESIGN VOLUME LISTED ABOVE. THE
SIZING, FIT AND APPLICABILITY OF THE STORMTECH CHAMBER SYSTEM FOR THIS
SPECIFIC PROJECT HAS NOT BEEN DETERMINED. IT IS THE ULTIMATE
RESPONSIBILITY OF THE DESIGN ENGINEER TO ASSURE THAT THE STORM WATER
SYSTEM DESIGN IS IN FULL COMPLIANCE WITH ALL APPLICABLE LAWS AND
REGULATIONS. STORMTECH PRODUCTS MUST BE DESIGNED AND INSTALLED IN
ACCORDANCE WITH STORMTECH'S MINIMUM REQUIREMENTS. STORMTECH LLC
DOES NOT APPROVE PLANS. SIZING. OR SYSTEM DESIGNS. THE DESIGN ENGINEER
IS RESPONSIBLE FOR ALL DESIGN DECISIONS.
NOTE: CHAMBER SYSTEM DESIGN MUST BE IN
ACCORDANCE WITH STORMTECH DESIGN MANUAL
.sA 20 Beaver Road, Suite 104
Wethersfield, CT06109 r
�mTd&T Phone: [phone]
„.... Fox: 866-328-8401
Sobsmlace Srormwoier mcnapemenf" wv^vstormte Ch.COm
;TORMTECH ACCEPTABLE FILL MATERIALS
SCALE: NT$ CHECKED
DATE, 11/01/2005 ACAD No.
DRAWN BY: I SHEET OF

STORMTECH GENERAL NOTES
1. STORMTECH LLC (-STORMTECH-) REQUIRES INSTALLING
CONTRACTORS TO USE AND UNDERSTAND STORMTECH'S
LATEST INSTALLATION INSTRUCTIONS PRIOR TO BEGINNING
SYSTEM INSTALLATION.
2. OUR TECHNICAL SERVICES DEPARTMENT OFFERS
INSTALLATION CONSULTATIONS TO INSTALLING
CONTRACTORS. CONTACT OUR TECHNICAL SERVICES
REPRESENTATIVE AT LEAST 30 DAYS PRIOR TO SYSTEM
INSTALLATION TO ARRANGE A PRE -INSTALLATION
CONSULTATION. OUR REPRESENTATIVES CAN THEN
ANSWER QUESTIONS OR ADDRESS COMMENTS ON THE
STORMTECH CHAMBER SYSTEM AND INFORM THE
INSTALLING CONTRACTOR OF THE MINIMUM INSTALLATION
REQUIREMENTS BEFORE BEGINNING THE SYSTEM'S
CONSTRUCTION. CALL 1-888-892-2694 TO SPEAK TO A
TECHNICAL SERVICE REPRESENTATIVE OR VISIT
WWW.STORMTECH.COM TO RECEIVE A COPY OF OUR
INSTALLATION INSTRUCTIONS.
3. STORMTECH'S REQUIREMENTS FOR SYSTEMS WITH
PAVEMENT DESIGN (ASPHALT, CONCRETE PAVERS, ETC.):
MINIMUM COVER IS 18 INCHES NOT INCLUDING PAVEMENT;
MAXIMUM COVER IS 96 INCHES INCLUDING PAVEMENT. FOR
INSTALLATIONS THAT DO NOT INCLUDE PAVEMENT, WHERE
RUTTING FROM VEHICLES MAY OCCUR, MINIMUM REQUIRED
COVER IS 24 INCHES, MAXIMUM COVER IS 96 INCHES.
4. THE CONTRACTOR MUST REPORT ANY DISCREPANCIES
WITH CHAMBER FOUNDATION MATERIALS BEARING
CAPACITIES TO THE DESIGN ENGINEER.
5. AASHTO M288 CLASS 2 NON -WOVEN GEOTEXTILE (FILTER
FABRIC) MUST BE USED AS INDICATED IN THE PROJECT
PLANS.
6. STONE PLACEMENT BETWEEN CHAMBERS ROWS AND
AROUND PERIMETER MUST FOLLOW INSTRUCTIONS AS
INDICATED IN THE MOST CURRENT VERSION OF
STORMTECH'S INSTALLATION INSTRUCTIONS.
7. BACKFILLING OVER THE CHAMBERS MUST FOLLOW
REQUIREMENTS AS INDICATED IN THE MOST CURRENT
VERSION OF STORMTECH'S INSTALLATION INSTRUCTIONS.
8. THE CONTRACTOR MUST REFER TO STORMTECH'S
INSTALLATION INSTRUCTIONS FOR A TABLE OF
ACCEPTABLE VEHICLE LOADS AT VARIOUS DEPTHS OF
COVER. THIS INFORMATION IS ALSO AVAILABLE AT
STORMTECH'S WEBSITE: WWW.STORMTECH.COM. THE
CONTRACTOR IS RESPONSIBLE FOR PREVENTING
VEHICLES THAT EXCEED STORMTECH'S REQUIREMENTS
FROM TRAVELING ACROSS OR PARKING OVER THE
STORMWATER SYSTEM. TEMPORARY FENCING, WARNING
TAPE AND APPROPRIATELY LOCATED SIGNS ARE
COMMONLY USED TO PREVENT UNAUTHORIZED VEHICLES
FROM ENTERING SENSITIVE CONSTRUCTION AREAS.
9. THE CONTRACTOR MUST APPLY EROSION AND SEDIMENT
CONTROL MEASURES TO PROTECT THE STORMWATER
SYSTEM DURING ALL PHASES OF SITE CONSTRUCTION PER
LOCAL CODES AND DESIGN ENGINEER'S SPECIFICATIONS.
10. STORMTECH PRODUCT WARRANTY IS LIMITED. SEE
CURRENT PRODUCT WARRANTY FOR DETAILS. TO
ACQUIRE A COPY CALL STORMTECH AT 1-888-892-2694 OR
VISIT WWW.STORMTECH.COM.
STORMTECH LLC CONCEPTUAL PLAN DISCLAIMER
THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE
A BED LAYOUT THAT WILL HANDLE THE DESIGN VOLUME LISTED ABOVE. THE
SIZING, FIT AND APPLICABILITY OF THE STORMTECH CHAMBER SYSTEM FOR THIS
SPECIFIC PROJECT HAS NOT BEEN DETERMINED. IT IS THE ULTIMATE
RESPONSIBILITY OF THE DESIGN ENGINEER TO ASSURE THAT THE STORMWATER
SYSTEM DESIGN IS IN FULL COMPLIANCE WITH ALL APPLICABLE LAWS AND
REGULATIONS. STORMTECH PRODUCTS MUST BE DESIGNED AND INSTALLED IN
ACCORDANCE WITH STORMTECH'S MINIMUM REQUIREMENTS- STORMTECH LLC
DOES NOT APPROVE PLANS, SIZING. OR SYSTEM DESIGNS. THE DESIGN ENGINEER
IS RESPONSIBLE FOR ALL DESIGN DECISIONS.
. NOTE: CHAMBER SYSTEM DESIGN MUST BE IN
ACCORDANCE WITH STORMTECH DESIGN MANUAL
�4� 20 Beaver Road, Suite 104
888-892-2694
�'�p,�.�� �5��7. Wethersfield, CT06109
��• Phax:866-328-8401
a„ ....e..A.,. Fax: [phone]
Svosurlcce Sturm weer momgemenl- v.WW.st OrrTlieCh.0001
S T OP.MTECH GENERAL NOTES
SOLE: NT$ CHECKED
DATE: H/WT2SO05 ACAD No.
6Y

STORMTECH PRODUCT SPECIFICATIONS
1.0 GENERAL
4.1 STORMTECH CHAMBERS ARE DESIGNED TO CONTROL
STORMWATER RUNOFF. AS A SUBSURFACE RETENTION
SYSTEM, STORMTECH CHAMBERS RETAIN AND ALLOW
EFFECTIVE INFILTRATION OF WATER INTO THE SOIL. AS
A SUBSURFACE DETENTION SYSTEM, STORMTECH
CHAMBERS DETAIN AND ALLOW FOR THE METERED
FLOW OF WATER TO AN OU FFALL.
2.0 CHAMBER PARAMETERS
2.1 1 HE CIIAMBER SHALL BE INJECTION MOLDED OF
POLYPROPYLENE RESIN TO BE INHERENTLY RESISTANT
TO ENVIRONMENTAL STRESS CRACKING (ESCR), AND TO
MAINTAIN ADEQUATE STIFFNESS THROUGH HIGHER
TEMPERATURES EXPERIENCED DURING INSTALLATION
AND SERVICE.
2.2 THE NOMINAL CHAMBER DIMENSIONS OF THE
STORMTECH SC-740 SHALL BE 30.0 INCHES TALL, 51.0
INCHES WIDE AND 90.7 INCHES LONG. THE NOMINAL
CHAMBER DIMENSIONS OF THE STORMTECH SC-310
SHALL BE 16.0 INCHES TALL, 34.0 INCHES WIDE AND 90.7
INCHES LONG, THE INSTALLED LENGTH OF A JOINED
CHAMBER SHALL BE 85.4 INCHES.
2.3 THE CHAMBER SHALL HAVE A CONTINUOUSLY CURVED
SECTION PROFILE.
2.4 THE CHAMBER SHALL BE OPEN -BOTTOMED.
2.5 THE CHAMBER SHALL INCORPORATE AN OVERLAPPING
CORRUGATION JOINT SYSTEM TO ALLOW CHAMBER
ROWS OF ALMOST ANY LENGTH TO BE CREATED. THE
OVERLAPPING CORRUGATION JOINT SYSTEM SHALL BE
EFFECTIVE WI TILE ALLOWING A CHAMBER TO BE
TRIMMED TO SHORTEN ITS OVERALL LENGTH.
2.6 THE NOMINAL STORAGE VOLUME OF A JOINED
STORMTECH SC-740 CHAMBER SHALL BE 74.9 CUBIC
FEET PER CHAMBER WHEN INSTALLED PER
STORMTECH'S TYPICAL DETAILS (INCLUDES THE
VOLUME OF CRUSHED ANGULAR STONE WITH AN
ASSUMED 40% POROSITY). THIS EQUATES TO 2.2 CUBIC
FEET OF STORAGE/SQUARE FOOT OF BED. THE
NOMINAL STORAGE VOLUME OF AN INSTALLED
STORMTECH SC-310 CHAMBER SHALL BE 31.0 CUBIC
FEET PER CHAMBER WHEN INSTALLED PER
STORMTECH'S TYPICAL DETAILS (INCLUDES THE
VOLUME OF CRUSHED ANGULAR STONE WITH AN
ASSUMED 40% POROSITY). THIS EQUATES TO 1.3 CUBIC
FEET OF STORAGE/SQUARE FOOT OF BED.
2.7 THE CHAMBER SHALL HAVE FORTY-EIGHT ORIFICES
PENETRATING THE SIDEWALLS TO ALLOW FOR LATERAL
CONVEYANCE OF WATER.
2.8 THE CHAMBER SHALL HAVE TWO ORIFICES NEAR ITS
TOP TO ALLOW FOR EQUALIZATION OF AIR PRESSURE
BETWEEN ITS INTERIOR AND EXTERIOR.
2.9 TFIE CHAMBER SHALL IiAVE BOTH OF ITS ENDS OPEN TO
ALLOW FOR UNIMPEDED HYDRAULIC FLOWS AND
VISUAL INSPECTIONS DOWN A ROWS ENTIRE LENGTH.
2.10 THE CHAMBER SHALL HAVE 14 CORRUGATIONS.
2.11 THE CHAMBER SHALL HAVE A CIRCULAR, INDENTED,
FLAT SURFACE ON THE TOP OF THE CHAMBER FOR AN
OPTIONAL 4-INCH INSPECTION PORT,
2.12 THE CHAMBER SHALL BE ANALYZED AND DESIGNED
USING AASHTO METHODS FOR THERMOPLASTIC
CULVERTS CONTAINED IN THE LRFD BRIDGE DESIGN
SPECIFICATIONS, 2ND EDITION, INCLUDING INTERIM
SPECIFICATIONS THROUGH 2O01. DESIGN LIVE LOAD
SHALL BE THE AASHTO HS20 TRUCK. DESIGN SHALL
CONSIDER EARTH AND LIVE LOADS AS APPROPRIATE
FOR THE MINIMUM TO MAXIMUM SPECIFIED DEPTH OF
FILL.
2.13 THE CHAMBER SHALL BE MANUFACTURED IN AN ISO
9001:2000 CERTIFIED FACILITY.
3.0 END CAP PARAMETERS
3.1 END CAPS WITH PREFABRICATED PIPE CONNECTIONS
SHALL BE INJECTION MOLDED FROM POLYETHYLENE
RESIN.
3.2 THE END CAP SHALL BE DESIGNED TO FIT INTO ANY
CORRUGATION OF A CHAMBER, WHICH ALLOWS:
CAPPING A CHAMBER THAT HAS ITS LENGTH TRIMMED;
SEGMENTING ROWS INTO STORAGE BASINS OF
VARIOUS LENGTHS.
3.3 THE END CAP SHALL HAVE SAW GUIDES TO ALLOW EASY
CUTTING FOR VARIOUS DIAMETERS OF PIPE THAT MAY
BE USED TO INLET THE SYSTEM.
3.4 THE END CAP SHALL HAVE EXCESS STRUCTURAL
ADEQUACIES TO ALLOW CUTTING AN ORIFICE OF ANY
SIZE AT ANY INVERT ELEVATION.
3.5 THE PRIMARY FACE OF AN END CAP SHALL BE CURVED
OUTWARD TO RESIST HORIZONTAL LOADS GENERATED
NEAR THE EDGES OF BEDS.
3.6 THE END CAP SHALL BE MANUFACTURED IN AN ISO
9001:2000 CERTIFIED FACILITY.
STORMTECH LLC CONCEPTUAL PLAN DISCLAIMER
THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE A BED LAYW T THAT
WILL IIANGLE THE DESIGN VOLUME LISTED ABOVE, THE SIZING. FIT ANDAPPLICMILITY OF THE
STORMTECH CHAMBER SYSTEM FOR THIS SPECIFIC PROJECT HAS NOT BEEN DETERMINED. R IS THE
OLT IMQE RE SPONSIBII ITY OF THE DESIGN ENGINEER TO ASSURE THAT THE STCRMWATER SYSTEM
DESIGN MIN FULL COMPLIANCE WITH ALL APPLICABLE LAWS AND REGULATIONS. STORMTECH PRODUCTS
MUST BE DESIGNED AND INSTALLED IN ACCORDANCE WITH STORMTECH'S MINIMUM REQUIREMENTS.
STORM TECH LLC DOES NOT APPROVE ELMS, SIZING, OR SYSTEM DESIGNS. THE DESIGN ENGINEER IS
RESPONSIBLE FOR ALL DESIGN DECISIONS.
NOTE: CHAMBER SYSTEM DESIGN MUST BE IN
ACCORDANCE WITH STORMTECH DESIGN MANUAL
��� 20 Beaver Rood, Suite 104
r 6w�`i�, Wethersfield, CT 06109
�7LM ,'�'1TC{r7r Phone: [phone]
Fox: 866-328-8401
SubwHoce slo,m^ l&W .stormtech.com
STORMTECH PRODUCT SPECIFICATIONS
CHECKED
ACAD No.
OF

D
it
4' SCH 40 PIPE
=CTION PORT
NOMINAL CHAMBER SPECIFICATIONS
SIZE (W x H x INSTALLED LENGTH) -
CHAMBER STORAGE -
MINIMUM INSTALLED STORAGE -
WEIGHT -
STUBS AT TOP OF END
CAP FOR PARTS NUMBERS
ENDING WITH'F'
51.0' x 30.0`x 85.4'
45.9 CUBIC FEET
74.9 CUBIC FEET
75 CBS.
STUBS AT BOTTOM OF END
CAP FOR PARTS NUMBERS
ENDING WITH'B'
PART#
CHAMBER
PIPE SIZE
A
B
C
SC740EPE06T
SC-740
6 in (150 mm)
10.90 in (277 mm)
18,50 in (470 mm)
N/A
SC740EPE06B
SC-740
6 in It 50 mm)
10.90 in (277 mm)
N/A
0.50 in (13 mm)
SC740EPEOBT
SC-740
8 in (200 mm)
12.20 in (310 mm)
17.50 in (445 mm)
N/A
SC740EPE08B
SC-740
8 in (2DO mm)
12.20 in (310 mm)
NIA
0.6D in (15 mm)
SC740EPEIOT
SC-740
10 in (250 mm)
13.40 in (340 HIM)
15.50 In (394 mm)
N/A
SC740EPEIOB
SC-740
/0 in (250 mm)
13.40 in (340 mm)
N/A
0.70 in (18 DDI
SC740EPE12T
SC-740
12 in (300 Tim)
14.70 in (373 mm)
12.50 in (318 Him)
N/A
SC74DEPE128
SC-740
12 in (300 mm)
14,70 in (373 mm)
N/A
1.20 in (30 mm)
SC740EPE15T
SC-740
15 in (375 mm)
18.40 in (467 mm)
9.00 in (229 mm)
NIA
SC740EPE15B
SC-740
15 in (375 mm)
18,40 in (467 mm)
N/A
1.30 in (33 mm)
SC74DEPE18T
SC-740
18 in (450 mm)
1910 in (5DO mm)
5.00 in (127 mm)
N/A
SC740EPE18B
SC-740
18 in (450 mm)
19.70 in (500 mm)
NIA
1.60 in (41 mm)
SC740EPE24B
SC-740
24 in (600 mm)
18.50 in (470 mm)
NIA
0.10 in (3 mm)
NOTEALL DIMENSIONS ARE NOMINAL
ALL STUBS, EXCEPT FOR THE SC740EPE24B
ARE PLACED AT BOTTOM OF END CAP SUCH
I THAT THE OUTSIDE DIAMETER OF THE STUB IS
FLUSH WITH THE BOTTOM OF THE END CAP.
FOR ADDITIONAL INFORMATION CONTACT
STORMTECH AT 1-888-892-2694.
* FOR THE SC740EPE24B THE 24-
em-
STUB LIES BELOW THE BOTTOM OF THE
END CAP APPROXIMATELY 1.75'.
BACKFILL MATERIAL SHOULD BE
REMOVED FROM BELOW THE N-12 STUB
SO THAT THE FITTING SETS LEVEL.
' NOTE: CHAMBER SYSTEM
DESIGN MUST BE IN
ACCORDANCE WITH STORMTECH
DESIGN MANUAL
20 Beaver Road, Suite 104
Effi'3�7,
Wethersfield, CT 06109
�y,�r
Phone: [phone]
,�.....,�..,.,,
5ubwrmce Slormwler Mona I
Fax: [phone]
I 1 h
STORMTECH LLC CONCEPTUAL PLAN DISCLAIMER
9
V✓W V.5 arm eC .com
THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE ABED LAYOUT THAT
WILL HANDLE THE DESIGN VOLUME LISTED ABOVE, THE SIZING, FIT AHD APPLICABILITY OF THE
SC-740 TECHNICAL
SPECIFICATIONS
I STORMTECHCHAMBER SYSTEM FOR THIS SPECIFIC PROJECT HAS NOT BEEN DETERMINED. It IS THE
ULTIMATE RESPONSIBILITY OF THE DESIGN ENGINEER TO ASSURE THAT THE STORM WATER SYSTEM
DESIGN IS IN FULL COMPLIANCE WITH ALL APPLICABLE LAWS AND REGULATIONS. STORMTECHPRODUCTS
SCALE: NTS
CHECKED
MUST BE DESIGNED AND INSTALLED IN ACCORDANCE WITH STORMTECHS MINIMUM REOUIREMENTS.
STORMTECH LLC DOES NOT APPROVE PLANS SONG, OR SYSTEM DESIGNS. THE DESIGN ENGINEER IS
DATE' B/15720D6
ACAD No.
RESPONSIBLE FOR ALL DESIGN DECISIONS,
DRAWN BY:
SHEET OF

STORMWATER CHAMBER SPECIFICATIONS
1. Chambers shall be StormTech SC-740, SC-310 or approved equal.
2. Chambers shall conform to the requirements of ASTM F2418-05, "Standard
Specification for Polypropylene (PP) Corrugated Wall Stormwater
Collection Chambers". -
3. Chamber rows shall provide continuous, unobstructed internal space with
no internal support panels.
'4. The structural design of the chambers, the structural backfill and the
installation requirements shall ensure that the load factors specified in the
AASHTO LRFD Bridge Design Specifications, Section 12.12 are met for: 1)
long -duration dead loads and 2) short -duration live loads, based on the
AASHTO Design Truck with consideration for impact and multiple vehicle
presences.
5. Only chambers that are approved by the engineer will be allowed. The
contractor shall submit (3 sets) of the following to the engineer for approval
before delivering chambers to the project site:
a. A structural evaluation by a registered structural engineer that
demonstrates that the load factors specified in the AASHTO LRFD
Bridge Design Specifications, Section 12.12 are met. The 50-year
creep modulus data specified in ASTM 2418-05 must be used as part
of the AASHTO structural evaluation to verify long-term performance.
b. A certification by the manufacturer that the chambers are in
accordance with ASTM F2418-05.
6. Chambers shall be produced at an ISO 9001 certified manufacturing
facility.
7. All design specifications for chambers shall be in accordance with the
manufacturer's latest design manual.
8. The installation of chambers shall be in accordance with the manufacturer's
latest installation instructions.
STORMTECH LLC CONCEPTUAL PLAN DISCLAIMER
THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE A BED LAYOUT THAT
WUL HANDLE THE DESIGN VOLUME LISTED ABOVE, THE SIZING, FIT AND APPLICABILITY OF THE
STORMTECH CHAMBER SYSTEM FOR TwS SPECIFIC PROJECT HAS NUT BEEN DETERMINED. 7 5 TIE
ULTIMATE RESPONSIBILITY OF THE DESIGN ENGINEER TO ASSURE THAT THE STORMWATER SYSTEM
DESIGN IS IN FULL COMPLIANCE WITH ALL APPLICABLE DAWS AND REGULATIONS. STORMTECH PROpKTS
MUST BE DESIGNED AND INSTALLED IN ACCORDANCE WITH STORMTECHS MINIMUM REQUIREMENTS.
STORMTECH LLC DOES NOT APPROVE PLANS. SIZING. OR SYSTEM DESIGNS. THE DESIGN ENGINEER IS
RESPONSIBLE FOR ALL DESIGN DECISIONS.
NOTE: CHAMBER SYSTEM DESIGN MUST BE IN
ACCORDANCE WITH STORMTECH DESIGN MANUAL
A!�,, 20 Beaver Road, Suite 104
Wethersfield, CT 06109
S,tlonnTecht Phone: [phone]
...... Fax: [phone]
Submnace smrmwnle...... mem- vvvnv.stormfech.conT
STORMWATER CHAMBER SPECIFICATIONS
DATE: 11/14/2005 1 ACAD No.
DRAWN BY: SHEET

APPENDIX It"
.
�".•rye
�
r
9�
�
a

Chapter 2 Estimating Runoff Technical Release 55
Urban Hydrolugy for Small Watersheds
Table 2-2c Runofl' curve numbers for other a ricultnial lands it
Curve numbers for
-- Cover description ---- — --- hydrologic soil group—
Hydiologic
Cover type condition A U C D
Pasture, grassland, or range —continuous
forage for grazing. Z'
Meadow —continuous grass, protected from
grazing and generally mowed for hay.
13r sl —brush-weer)-grass mixture with brush
the nnior element. al
Woods —gnus combination (orchard
or tree I'arni). N
Woods. 5'
Poor
68
79
86
89
Fair
49
69
79
84
Good
39
61
74
80
—
30
58
71
78
Poor
48
67
77
&3
Fair
35
56
70
77
Good
30.y
48
65
73
Pool'
57
73
82
86
Fair
43
65
76
82
Good
32
58
72
79
Poor
45
66
77
83
Fair
36
60
73
79
Good
30.11
55
70
77
Farmsteads —buildings, lanes, driveways, — 59 74 82 86
and surrounding lots.
I Average rmroff condition, and f„ = 0.2S.
x Pau': <5096) ground cover or heavily grazed with no mulch.
Fair: 50 to 75%ground cover and not heavily grazed.
Cool., > 75%ground cover and lightly or only occasionally grazed.
a Poor. <50% ground cover.
Fair: 50 to 75%ground cover.
Cood: >75% ground cover.
.t Actual curve number is less than 30; use CN = 30 for runoff computations.
5 ON's shown were computed for areas with 50% woods ;in(] rW grass (pasture) cover. Other conibinat ions of conditions may be computed
from the CN's for woods and pasture.
Q Poore Forest litter, small trees, and blush are destroyed by heavy grazing or regular horning.
Fair. Woods are grazed but notburned, and some forest litter rovers the, soil.
Coo& Woods are protected from grazing, and litter and brash adequately cover We soil.
(210-VI TR-65, Second Ed.,June 1986) 2-7

Precipitation Frequency Data Server
Page 1 of 4
POINT PRECIPITATION
FREQUENCY ESTIMATES _
FROM NOAA ATLAS 14
North Carolina 33.909 N 78.075 W 0 feel
from "Precipitation -Frequency Atlas of the Untied Stales" NOAA Atlas 14, Vol nine 2, Version 3
G.M. Rennin, D. Manin, B. Lin, 1'. Parzybok, M.Yelaa, and D. Riley
NOAA, National Weather Service, Silver Spring, Maryland, 2004
Extracted: Mon Mary 5 2008
Confidence Limits
Seasonality
I Location Maps I
Other Info.
GIS data
Maps I
Help
Precipitation Frequency Estimates (inches)
0mm
m
(12
4d
daX
3a.07y
d086108
cl4a5y
rl6a0y
=00
A8
4
4
5
57
4
.20
869
7
13.35
16.30
0.64
1.03
1.29
1.78
2.23
2.70
2.87
3.62
4.24
4.92
5.C,4
6.17
6.96
7.76
10.36
12.80
15.79
19.20
0.74
1.19
1.50
2.14
2.74
3.39
3.63
4.58
5.41
6.38
7.23
f81
8.75
9.61
12.62
15.36
18 70
22.46
IO
0.83
1.33
L68
2A3
3.17
4.00
432
SA6
6.49
7.64
8.61
9.21
10.24
I LI5
14.48
17.42
21.04
25.03
25
0.93
L49
1.89
2.80
3.72
4.83
5.29
6.71
8.03
9.58
10.70
11.29
12.4I
13.37
17.12
20.26
24.26
28A8
5(1
1.02
1.62
2.05
3.09
4.19
5.56
6.15
7.82
9A2
11.30
12.54
13. 88
14.23
15.23
19.29
22.54
26.81
31.14
I(10
I.10
1.75
2.21
3.38
4.66
632
7.08 I
9.04
10.95
13.25
F14.61
I5.05
16.21
E23
E57
24.88
29.41
33.80
2t10
I,IS
1.87
2.36
3.68
5.16
7.16
8.11
10.39
12.C,8
15.47
1694
I7.23
18.37
19.38
23.99
27.30
3208
36.47
5(10
1.29
2A4
2.57
4.(19
5__
8.37
9.64
12.44
15.30
18.91
20.50
20.G5
21.50
22.50
2f43
30.64
35.72
40.01
1000
1.38
2.18
2.73
4�12
6.46
9.43
II.01
14.27
17.G9
2 L95
23.62
23.85
24.15
25.09
30.24
33.27
38.58
42.72
*These precipitation frequency estimates are based on a partial duration series, ARI is the Average Recurrence Interval.
Please refer to the documentation for more information. NOTE: Formatting forces estimates near zero to appear as zero.
G
* Upper bound of the 90% confidence interval
Precipitation Frequency Estimates (inches)
ARI*"
(yea rs)
5
min
Ill
min
IS
min
311
min
6(1
min
1211
min
3
hr
6
lu•
12
hr
24
hr
48
hr
4
d:iy
7
clay
I11
day
20
day
311
day
4�
da}'
611
day
=I
0.58
0.93
1.16
1.59
1.99
2.41
2.59
3.27
3.88
4.47
5.1 I
5.57
6.22
6.96
9.31
11.47
14.18
17.23
�2
0.69
I.I I
1.39
L93
2.42
2.94
3.16
4.00
4.73
5.43
6.19
6.72
7.51
8.35
1 I.10
13.63
16.77
20.32
0
0.80
1.28
1.62
2.31
2.96
3.70
399
5.06
6.04
7.02
7.96
8.51
9.44
10.34
13.53
16.36
19.87
23.78
(19
4.36
44
62
A.47
10.030
.0
2155
152
8.5
.37
2910
6.4
25
1.00
1.60
2.03
3.01
4.00
5.26
5.80
7.38
8.92
10.53
11.78
12.30
13.39
14.40
18.33
21.57
25.81
30.16
511
1.09
1.74
2.21
3.32
4.50
6.05
6.74
8.60
10.45
12.43
13.85
14.27
15.38
16.43
20.68
24.05
28.55
33.03
I(10
1.18
1.88
2.38
3.64
5.01
6.88
7.75
9.93
12.14
14.60
16.18
16.46
17.57
18.63
23.23
26.62
31.39
35.93
200
1.27
2.02
2.55
3.96
5.56
7.79
8.87
11-
14.04
17.10
18.83
18.95
19.96
21.05
25.97
2933
34.36
38.89
1.39
2.20
2.77
4.41
6.33
9.13
IO.S7
13.69
1697
21.00
22.93
23.16
23.57
24.63
29.93
33.15
38.53
42.92
1000
L50
2.36
2.96
4.79
6.99
10.31
12.09
15.74
19.59
24.57
26.G1
26.88
27.15
27.67
33.20
36.19
41.88
46.08
I ne upper Donna of [no connaence Interval at w-/. conliaenca level is the value which a%of me simulated quaetAe values for a given frequency are greater than.
"These precipitation frequency estimates are based on a partial duration series. ARI is the Average Recurrence Interval.
Please refer to the documentation for more information. NOTE: Formatting prevents estimates near zero to appear as zero.
* Lower bound of the 90%) confidence interval
Precipitation Frequency Estimates (inches)
ARI 5 10 IS 30 60 120 3 6 12 24 48 4 7 10 20 30 4a 60
(years) min min min min min min hr hr hr hr hr day day day day day day day
littp:Hhdse. n ws.noaa. gov/cg i-bin/lidsc/bLIi Idout. pe rl'?type=p f& un i tS=us&series=pd&statena... 5/5/2008

Precipitalion Frequency Data Server
Page 2 of 4
0.50
0.80
I.00
1.38
1.72
2.04
2.17
2.72 3.16
3.72
4.30
4.73
5.38
6.06
8.16
10.16
12.61
15.45
0
0.60
0.95
1.2-
566
2.08
2.49
2.64
3.31
3.84
4.52
5.20
5.71
6.50
7.26
9.72
12.06
14.91
18?0
0.69
I.10
1.39
198
2.54
3.12
3.32
E]E
4.89
5.84
6.64
7.21
8.15
896
11.81
14.45
1262
21.25
Ill
0.77
1.23
I.55
2.25
2.92
3.67
3.94
4.96
5.83
6.97
7.87
8.46
9.49
10.37
I3.52
16.35
19.79
23.64
0863742742A
40
6
68
9
2
2
5
8.9
227
68025
5(1
0.93
ES
I.88
2.83
3.83
5.05
5.54
7.01
8.34
10.11
11.23
I1.82
13. 11
13.97
17.80
20.96
25.02
29.23
l0U
1.00
1.59
2.01
3.(I8
4.24
5.71
6.33
8.03
9.60
11.71
12.91
13.46
14.68
15.68
19.75
22.99
27.29
31.58
2011
1.07
1.69
2.14
3.33
4.67
6A2
Z 19
9.14
11.00
13.47
14.82
15.23
16.44
17.45
21.79
25.04
29.56
33.87
500
I.IS
1.82
2.30
3.65
5.24
7A2
8.44
10.79
13.08
I6.10
17.58
17.91
18.94
19.95
24.54
27.79
32.57
36.86
I(11111
1.23
L93
2 �12
392
5.72
8.30
9.53
I2.24
14.89
18.34
19.90
20.15
2095
21.95
26.72
29.91
3490
39.1 I
' the lower bound of toe confidence Interval at W%confidence level is the value which 59 of the simulated quanllle values for a given frequency are less than.
"These precipitation frequency estimates are based on a parralduration maxima series. ARI is the Average Recurrence Interval.
Please refer to the documentation for more information. NOTE: Formatting prevents estimates near zero to appear as zero.
rText version of tables _,
Partial duration based Point Precipitation Frequency Estimates - Version: 3
33.909 N 78.075 W 0 ft
44
42
40
38
36
34
32
30
r 28
i 26
a 24
0 22
20
v 18
a 16
14
i 12
10
8
6
4
2
0
1 2 3 4 5 6 7 8 910 20 30 40 50 80 100 140 200 300 500 700 1000
Averatte Recurrence Interval (years)
Pion Nay 05 09:03:29 2008
Duration
5-min - 48-hr -I!- 30-day i
10-min 4-day -+-
15-min7-day -x- 60-day -:�-
30-min a 12-hr 10-dsu -+-
60-min - - 24-hr -a- 20-dau -o-
http://hdse.iiws.iioaa.gov/cgi-bin/hdse/bui Idout.per]?type=pf&units=us&series=pd&stateiia... 5/5/2008

Precipitation Frequency Data Server
Page 3 of 4
I
Partial duration based Point Precipitation Frequency Estimates - Version: 3
33.909 N 78.075 11 0 ft
44
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
6
6
4
2
0
C
C C
C
C
C E
L L L L L i L
E
E E
E
E
£ 0
I I I I I 1 I I
I
I I
I
I
I N
CI a �O m N m a
-' •'
M
m
u.
Duration
Mon May
05 09:03:29
2008
Maps -
L L T n T 7' n
t L Q N N N N N N N -e N
I I a a a a a a s a a s
M V M V N (\ 0 N 0 0 Yl
Average Recurrence Interval
(years)
1 -R-
2 +- 100 —
10 -a 500 -+-
25 -i 1000 -a
These maps were produced using a direct map request from the
U.S. Census Bureau Mapping and Cartographic Resources
Tiger -Map Server.
liUp://hclsc.iiws.noaa.gov/cgi-bin/hdse/bui ldout.perl?type=pf&writs=us&series=pd&statena... 5/5/2008

Precipitation Frequency Data Server
Page 4 of 4
z Please read disclaimer for moo e lnfornmtion
z
c
LEGEND
— State
— Connector
— County
I7-1 Streato
Indian Resv
Military Area
Lake/Pond/Ocean
National Park
— Street
Other Park
— Expressway
0 City
— H ighway
�� C(�urtty 5 8
°; Scale 1:228583 2
r.
mi
11
8resol�ution
r-'taveraoe--true scale depends
on monitor
Other Maps/Photographs -
View_USCS digital orthophoto quadrangle (UOQ) covering this location 4om'I'erraServer; USGS Aerial Photograph
may also be available
from this site. A DOQ is a computer -generated image of an aerial photograph in which image displacement caused by terrain
relief and camera tilts has been removed. It combines the image characteristics of a photograph with the geometric qualities
of it map. Visit the USCS for more information.
Watershed/Stream Flow Information -
rind the Watershed for this location using the U.S. Environmental Protection Agency's site.
Climate Data Sources -
Precipitation fi•equencv results are based on data from a variety ofsources, but largely NCDC'. The following links provide
general information
about observing siles in the area, regardless of iij'their data was used in this study. For detailed information about the
stations used in this .study,
please refer to our documentation.
Using the National Climatic Data Center's (NCDC) station search engine, locate other climate stations within:
+/-30 minutes OR +j-1 degree of this location (33 909/-78.075). Digital ASCII data can be obtained
directly from NCDC.
lipirometcorological Design studies Center
DOC/NOAA/National Weather service
1325 East-West Ilighway
Silver spring, M1ln 20910
(3111) 713-1669
Questions?: HUSC.Quesfions a noua.gov
Disclaimer
http://hdsc.iiws.noaa.gov/cgi-bin/hdsc/bLliIdout. perl?type=pl &units=us&series=pd&statena... 5/5/2008

Precipitation Frequency Data Server
Pagel of4
POINT PRECIPITATION
FREQUENCY ESTIMATES_
FROM NOAA ATLAS 14
North Carolina 33.909 N 78.075 W 0 feet
from "Precipilalion-Frequency Atlas of the United Stales" NOAA Allus 14, Volume 2, Version 3
G.M. nonnin, O. Martin, B. Lin, T. Parzybok, M.Yekm, and D. Riley
NOAA, National Weather Service, Silver Spring, Maryland, 2004
Extracted: Tee Jul 15 2008
Confidence Limits
Location Maps
Other Info.
I GIS data
I Maps I
Help I
Doc;
U.S. Map
Precipitation Intensity Estimates (in/hr)
AEIx*
Q-in-
Y)
5 min
I11
min
I_5
min
311
min
6(I
min
120
mm
❑
3 Irr
6 hr
-
12
hr
24
Irr
4N
hr
4
do
������
Ud
10
da
20.
da ,
30
da
45
da
7.0E
5.67
4.75
3.28
2.06
1.24
0.88
0.56
0.32
0.19
O.I I
0.06
0.04
0.03
0.02
0.02
0.01
Eo
8.70
6.97
5.88
4.18
2.68
1.66
1.1E
0.75
0.44
0.2E
0.15
0.08
0.05
0.04
0.03
0.02
0.02
C
986
78
6.65
4.823
9
42
0
0
0
0
0
0
0
002
02Ill
Eo
25
11.16
8.90
7.52
5.57
3.71
2.41
1.75
1.12
0.66
0.40
0.22
0.12
0.07
0.06
0.04
0.03
0.02
Eo
511
12.1G
9.68
8.18
6.16
4.17
2.77
2.04
1.30
0.78
OA7
0.26
0.14
0.08
0-
0.04
0.03
0.02
Eo
I11(1
13.15
10.45
8.80
6.74
4.64
3.15
2.35
1.50
0.91
0.55
0.30
0.16
0.10
0.07
0.04
0.03
0.03
C
2110
14.13
11.20
9.42
7.33
5.14
3.5(,
2.69
1.73
I.OS
0.64
0.35
0.18
0.11
0.08
0.05
0.04
0.03
C
511(1
15.42
12.19
10.23
8.14
5.84
4.17
3.20
2.07
L27
0.78
0.43
0.21
0.13
0.09
0.0
00.04
0.03
10(10
16.52
13.01
10.88
8.81
6.43
4.70
3.C,5
2.37
1.46
0.91
0.49
0.25
0.14
0.10
0.06
0.05
0.04
These precipitation frequency estimates are based on an annual maxima series. AEP is the Annual Exceedance Probability.
Please refer to die documentation for more information. NOTE: Formatting forces estimates near zero to appear as zero.
* Upper bound of the 90%k confidence interval
Precipitation Intensity Estimates (in/hr)
5V) 10[nit. min min min min min hr hr hr hr hr clay clay day day clay day
7.66
6.12
5.13
3.55
2.22
136
097
0.61
0.36
0.21
0.12OF067
OF041
0.03
0.02
0.02
0.01 0
0
9 4
7.52
6.35
4.51
2.89
1.81
1.30
0.83
0.49
0.29
0.16
0.09
0.05
0.04
0.03
0.02
0.02 C
10
10.62
8.50
7.16
5.19
3.38
2.16
1.56
1.00
0.59
0.35
0.20
0.10
0.07
0.05
0.03
0.03
0.02 EO
25
12.01
9.57
8.09
5.99
3.99
2.62
1.92
1.23
0.74
0.44
0.24
0.13
0.08
0.06
0.04
0.03
0.02 C
511
13.08
10.41
8.79
Ej
4.48
EE
2.23
1.43
0.86
0.52
0.29
0.15
0.09
0.07
0.04
0.03
0.03 C
100
14.15
11.24
9.47
7.25
499
3.43
2.57
L65
I.00
0.61
0.34
0.17
0.10
0.08
0.05
0.04
0.03
200
15.21
12A7
10.15
7.90
5.54
3.88
294
I.90
I.I6
0.71
0.39
0.20
0.12
0.09
0.05
0.04
0.03
5(10
16.65
13.17
11. 55
8.7E
6.30
4.55
3.51
2.28
L
0.87
0.48
0.24
0.14
0.10
0.06
0.05
0.04 C
1000
17.88
14.08
11.78
9.54
6.96
5.14
4.01
2.62
LC>2
1.02
0.55
0.28
0.16
0.11
0.07
0.05
0.04
' The maser bound of the
confidence interval at 90%confidence
level is the value which 5%of
the simulated
ouantile values for a civen frenuency are areater than.
"These precipitation frequency estimates are based on an annual maxima series. AEP is the Amoral Exceedance Probability.
Please refer to the documentation for more information. NOTE: Fonnattlng prevents estimates near zero to appear as zero,
hffiri- brio nwc non7/1 C/7MR

Exhibit A: Hydrologic Soil Groups for the United Stales
KORNMAN.....................................
C
KOROBAGO..................................
C
KORONIS.....................................-
B
KORTTY.........................................
B
KOSETH.........................................
B
KOSMOS........................................
D
KOSSE...........................................
B
KOSSUTH..................................
BID
KOST............................ ............ ....
- A
KOTO.............................................
D
KOTZMAN......................................
B
KOUNTER............... --- ..... ..........
- D
KOURY...........................................
B
KOYNIK..........................................
D
KOYOKEE......................................
C
KOYUKTOLIK................................
D
KRACKLE.......................................
B
KRADE...........................................
B
KRAKON........................................
D
KRAKOW........................................
B
KRAM.............................................
D
KRANSKI........................................
B
KRANZBURG.................................
B
KRAUSE.........................................
B
KR EAM ER ......................................
C
KREBS...........................................
B
KREFT..........................................-C
KREM...................................... .....
-A
KRENKA.........................................
B
KR ESSON......................................
C
KREYENHAGEN ...........................
B
KREZA............................................
D
KRIER.............................................D
KRIEST...................... ...... - ........
.... B
KROME..........................................
A
KRON.............................................
D
KROTO...........................................
B
KRUBATE......................................
B
KRUEGER.................. ........... - ....
... C
KRUM.............................................
D
KRUTAR.........................................
B
KUBE................................ - ........
.... B
KUDLER.........................................
C
KUBLI................................... -........
D
KUCKUP.........................................
A
KUDLAC.........................................
C
KUKAIAU........................................
A
KUKAIAU, Bedrock Substratum
... B
KUKVEY.........................................
A
KULA..............................................
B
KULLIT............ ................ - ........ -...
B
KULSHAN........................... ...........
C
KUNAYOSH............. -....................
A
KUNCEIDER..................................
A
KUNIA.............................................
B
KUNUWEIA..... ......................... -
.... C
KUPREANOF.................................
B
KUPREANOF, Moderately Wet
.... C
KUR EB...........................................
A
KURK..............................................
C
KURO.............................................
D
KURSTAN......................................
B
KURTE N.........................................
D
KURTH...........................................
C
KU RTZ............................................
C
KUSAL............................................
C
KUSDRY.........................................
C
KUSHNEAHIN ..............................-
D
KUSKOK W IM.................................
D
KUSLINA........................................
D
KUSLINAD.....................................
D
KUSSHI..........................................
B
KUTLER.........................................0
KUVASZ........ .......... .......... ..........
...0
KUY................................................
A
KVICFIAK......... ..............................
B
KWAKINA.......................................
B
KWATAHEIN..................................
B
KWEO.............................................
A
KYBURZ.........................................
B
KYDAKA.........................................
D
KYGER...........................................
B
KYLE..............................................
D
KZIN................................................
D
LA FARGE......................................
B
LA GRANDE... ........ ...................
... C
LA POSTA......................................
B
LA ROSE ........................................
B
LABELLE........................................
D
LASETTE.......................................
C
LABKEY.........................................
B
LABLUE.......................... --............
D
LABORCITA...................................
B
LABOU............. ..... -.......................
D
LABRE............................................
B
LABSHAFT.....................................
D
LABU... ... ...... -- ..............................
D
LABYRINTH ...................................
A
LACERDA...........................
........... D
LACESCREEK.........................._...
B
LACKSCREEK ........ ....................
.. C
LACLEDE.......................................
B
LACONNER.... ............................
.. C
LACOOCHEE.................................
D
LACOSTE ._....................................
C
LACOTA.....................................
BID
LACRESCENT .................
B
LACROL.... .... - ...............................
D
LADERLY...... .................. ..............
C
LADNER.........................................
D
LADD..............................................
B
LADRON.........................................
B
LADUE............................................
B
LADYBIRD .....................................
B
LADYCOMB...................................
D
LADYSMITH...................................
D
LAFAYETTE.......... ..................
-..... B
LAFE...............................................
D
LAFOLLETTE.................................
B
LAGITOS........................................
C
LAGLORIA.....................................
B
LAGO..............................................
C
LAGONOT......................................
C
LAGRANGE...................................
D
LAGROSS......................................
A
LAGUN ITA.....................................
C
LAHAINA........................................
B
LAHOGUESS.................................
B
LAHOOD........................................
B
LAHRITY.... ..............................
...... C
LAHTIDA........................................
C
LAINAND........................................
B
LAIRDSVILLE ........- ......................
D
LAKASH.........................................
B
LAKASKIA......................................
D
LAKE..............................................
A
LAKE, Clayey Surface...................0
LAKE CHARLES ... ...................
...... D
LAKEBEDDER ...............................
B
LAKEFIELD....................................
B
LAKELAND....................................A
LAKEPARK................................
BID
LAKESHORE.................................
B
LAKESHORE.................................
D
LAKESOL.......................................
B
LAKETON.......................................
C
LAKEWOOD ...................................
A
LAKIN.............................................
A
LAKOMA.........................................
D
LAKOTA.............. ...................
-...... D
LAKRIDGE.......... ......... .................
C
LALAAU..........................................
A
LALINDA...-.... .... .......... -...............
B
LALOS............................................
B
LAM................................................
D
LAMA..............................................
C
LAMADRE......................................
B
LAMANGA......................................
C
LAMAR...........................................
B
LAMARSH......................................
C
LAMARTIN E...................................
C
LAMATH.........................................
D
LAMAWA........................................
B
LAMBERJACK ...... .............
--........ B
LAMBMAN.............................
- ...... C
LAMBRANCH......- .........................
D
LAMBUTTE....................................
B
LAMEDEER...................................
B
LAMESA.........................................
D
LAMESHUR...................................
A
LAMINE..........................................
D
LAMINGTON..................................
D
LAMKIN..........................................
B
LAMOILLE......................................
B
LAMOTTE......................................
B
LAMPASAS....................................
D
LANARK............... - ....... - ........
....... B
LANCASTER................. - ........
....... B
LANCE. .......... .......... .....................
B
LAND .................... - ....... -...........
BIC
LANDAVASO.................................
B
LAN DCO................ ......... -..............
C
LANDINGHAM ...............................
B
LANDMAN..................... .........
-...... B
LAN DO ...........................................
C
LANDUSKY....................................
A
LANEVILLE........... ...............
B
LANEXA....--...... ............. ..............D
LANEY............................................
B
LANFAIR........................................
B
LANGDON......................................
A
LANGELLAIN.........................
D
LANGER..............................-.........
A
LANGLADE....................................
B
LANDLESS ....................................
C
LANGLOIS.....................................
D
LANGOLA......................................
C
LANGSPRING................................
B
LANGSTON...................................
B
LANGWELL....................................
D
LANIER..........................................
A
LANIP.............................................
B
LANKBUSH....................................
B
LANOAK.........................................
B
LANONA............... ..... -- ....
......... ... B
LAN S DO W N E................................
C
LANTERN .......................................
8
LANTIS...........................................
B
LANTON, Low Rainfall..................0
LANTON.........................................
D
LANTONIA.....................................
B
LANTRY.........................................
B
LAN TZ......................... -.................
D
LANYON...............................
-.... CID
LAOLAO.........................................
B
LAONA................ ....... - .........
......... B
LAPARITA.................. ..........
......... .0
LAPHAM.........................................
A
LAPLATTA.....................................
C
LAPOINTE.............. .... - .......
.......... . C
LAPON............. - ........ ..............
..... . D
LAPPANS.....................................
- A
LAPWAI..........................................
B
LARA-............................................
C
LARCHMOUNT ..............................
B
LARCHPOINT................................
C
LARES............................................
C
LARIAT ...........................................
B
LARIC.............................................
D
LARIM.............................................
B
LARIMER.......................................8
LARIOSCAMP................................
D
LARMINE...........................
............ D
LAROOUE......................................
B
LAROSE.........................................
D
LAROSS.........................................
B
LARPENTEUR ...............................
B
LARRY........................................
CID
LARTON.........................................
A
LARUE............................................
A
LARUSH.........................................
B
LAR V I E..................... -- .......
........... D
LA R W 00 D.....................................
C
LAS FLORES .............. --..............
D
LAS LUCAS...................................
B
LAS VEGAS............... ............
..... ...D
LASAC............................................
A
LASALLE........................................
D
LASAUSES....................................
D
LASERE.........................................
C
LASH..............................................
B
LASKA............................................
B
LASSEL..........................................
C
LASSITER......................................
B
LASTANCE.........................
-......... B
LASVAR...-....................................
C
LATAH......-.... .... .......... ................
- D
LATAHCO......................................
D
LATANI ER ......................................
D
LATCH......- ....................................
A
LATES............................................0
LATEX.......................... ........
..... .... .0
LATHER .........................................
D
LATI ERRA......................................
B
LATIGO..........................................
B
LATI MER........................................
D
LATINA................................
......... - D
LATIUM..........................................
D
LATONIA........................................
B
LATOUCHE............................
.... _.. D
LATOUR.......................................-
B
LATOURELL..................................
B
LATRASS_.........- ..............
......... D
LATTAS............... ................
......... - D
LAUBY............................................
B
LAUDERDALE ...............................
D
LAUDERHILL .............................
BID
LAUER....... - ...............................
CID
LAUGENOUR.............. .........
..... ....0
LAURAMIE.....................................
B
LAUREL ...- ....................................
D
LAURELWOOD .......... ..........
- ... -... 8
LAUREN.............. ...............
--........ B
LAVALLEE.....................................
B
LAVEAGA.......................................
C
LAVELLGA.....................................
B
LAVENDER. - .................
- ..... .... B
LAVENTANA..................................
C
LAVEY............................................
D
LAVINA... ................... .........
- ... ....... D
LAVODNAS............... - ........
........... C
LAWAI............................................
B
LAWEN... ....................... ...............-B
LAWN DALE ...- ..............................
B
LAWNES........................................D
LAWNWOOD .............................
BID
LA W RENCE... .._....... .......
-........... C
LAWRENCEVILLE .........................
C
LAWSON........................................
C
LAWVER........................................
B
LAX.................................................
C
LAXTON.........................................
C
LAYCOCK......................................
B
LAYTON...-....................................
B
LAZAN............................................
D
LAZBUDDIE...................................
D
LEBAR ..... ........ ....... -- ....
- ... ..... -... B
LEA. ............. ............
........... C
LEADER.........................................
B
LEAOORE......................................
B
LEADPOINT...................................
C
LEADVALE.....................................
C
LEAF...............................................
D
LEAFLAKE.....................................
B
LEAGUE .........................................
D
LEAGUEVILLE ............. ....
- .... .. BID
LEAKEY.........................................
D
LEAKSVILLE............. ........
_-......... D
LEANDER......................................
B
LEANNA.........................................
D
LEATHAM......................................0
LEATHERBARK ...... ...........
.......... -C
LEATHERS ..............................
-.... 8
LEATHERWOOD ...........................
B
LEAVENWORTH ...............
............ C
LEBAM...........................................
B
LEBEAU....... ........... - ...........
.......... D
LEBEC............................................
B
LEBRON.........................................
D
LECKMAN......................................
B
LECOMA........................................
B
LECRAG.........................................
D
LEDFORD... ........... -......................
B
LEDGER ................... .........
- ........ ... D
LEDOW..........................................
B
LEDRU...........................................
D
LEDWITH............... - .........
......... BID
LEECREEK....................................
D
LEEDSVILLE.......... ..........
- .... .... .... B
LEEFIELD..................................
.... C
(210-VI-TR-55, Second Ed., June 1086) A-21

NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue
Governor
June 29, 2009
Coleen H. Sullins
Director
Mr. Thomas B. Morris, Senior Vice President
First Citizens Bank and Trust Company
PO Box 27131
Raleigh, NC 27611
Subject: Request for Additional Information
Stormwater Project No. SW8 080744
First Citizens Bank
Brunswick County
Dear Mr. Morris:
Dee Freeman
Secretary
The Wilmington Regional Office received a modified State Stormwater Management Permit
Application for the First Citizens Bank on February 19, 2009 with additional information received
on April 28, 2009. A preliminary review of that information has determined that the application is
not complete. The following information is needed to continue the stormwater review:
1. Plan sheets C5, and C10 illustrate that the three (3) additional Stormtech chambers
required to treat the additional BUA are not connected to the inlet manifold. A site
inspection on April 8, 2009 confirmed that these chambers have already been installed
without the prior approval of DWQ.
After reviewing the additional information received on April 28, 2009 and subsequent
discussions within DWQ, it was decided that this additional row of Stormtech chambers
is required to be connected to the manifold for maintenance and accessibility.
Please extend the manifold to connect these additional Stormtech Chambers to the rest
of the stormwater system. If the manifold is not extended to the additional row, a Notice
of Violation will be issued for modifying the permitted stormwater system without prior
approval.
The following is not a requirement for approving the proposed modification, but is strongly
recommended:
2. The site is draining to SA/HQW waters, an important resource to the coastal
communities. The stormwater system, as permitted, appears to be designed to act more
like an underground dry detention pond instead of an infiltration trench. This system
appears to have been approved with an outlet device (including an orifice) that will assist
in the draw down of the required storage volume. Infiltration systems should be
designed to store the required volume for infiltration into the soil with the only outlet
being an overflow weir to bypass the excess runoff.
The Division is asking you to consider helping in our mission to preserve, protect, and
enhance water quality by plugging the 3.5"x19" rectangular orifice in the outlet structure.
These actions will help to fully utilize the infiltration system as intended by infiltrating
stormwater runoff and reducing the runoff directly reaching surface waters. If these
actions are to be completed, please update the plans to reflect the changes (including
plan sheet C12).
Wilmington Regional Office
127 Cardinal Drive Extension, Wilmington, North Carolina 28405
Phone: [phone] FAX: [phone] Customer Service. 1-877-623-6748
Internet:v .ncwauuquality.org
NorthCarolina
Naturally
An Equal Opportunity 1 Affirmative Action Employer

L
Thomas B. Morris
June 29, 2009
Stormwater Application No. SW8 080744
Please note that this request for additional information is in response to a preliminary review.
The requested information should be received in this Office prior to July 30, 2009, or the
application will be returned as incomplete. The return of a project will necessitate resubmittal of
all required items, including the application fee.
If you need additional time to submit the information, please mail, email or fax your request for a
time extension to the Division at the address and fax number at the bottom of this letter. The
request must indicate the date by which you expect to submit the required information. The
Division is allowed 90 days from the receipt of a completed application to issue the permit.
The construction of any impervious surfaces, other than a construction entrance under an
approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject
to enforcement action pursuant to NCGS 143-215.6A.
Please reference the State assigned project number on all correspondence. Any original
documents that need to be revised have been sent to the engineer or agent. All original
documents must be returned or new originals must be provided. Copies are not acceptable. If
you have any questions concerning this matter please feel free to call me at [phone] or
email me at [e-mail].
Sincerely,
l� (y_
(W
Christine Nelson
Environmental Engineer
GDS/can: S:\WQS\STORMWATER\ADDINFO\2009\080744�09
cc: Peter A Bishop, Kimley — Horn and Associates, Inc.
Christine Nelson
Wilmington Regional Office
Page 2 of 2

Nelson, Christine
From: Patterson, Robert
Sent: Tuesday, June 23, 2009 8:36 AM
To: Nelson, Christine; Johnson, Kelly
Subject: RE: infiltration trench questions
Well, I guess if it's built like that already... we probably are not going to make them dig it up to connect it to the
manifold. I guess you could approve it as built, and note that it will not be allowed again. Or, if you feel like chasing it,
make him dig it up since they didn't get it approved before modifying the plans. I think it will fill up, but again, there is
no way to access those chambers. Could we enforce on them for not building it per the approved plans so that they
won't do this again?
Robert D. Patterson, PE
Environmental Engineer
NCDENR I DWQ I Stormwater Permitting
161.7 Mail Service Center, Raleigh, NC 27699-1617 (Mailing)
512 N. Salisbury St, Raleigh, NC 27604 (Location & Parcels)
[phone] Phone [phone] Fax
Email: robert.patterson(u,ncdenr.gov (NOTE NEW EMAIL ADDRESS)
Website: http:/Jh2o.etir.state.nc.us/su/stormwater.html
*Please consider the environment before printing this email'
?"r Genie.' c9191L3/M
��17\ \V\4A\ mc^�t0�k\
�r \x \h5vq_� G^ N04
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties.
From: Nelson, Christine
Sent: Tuesday, June 23, 2009 8:07 AM
To: Johnson, Kelly; Patterson, Robert
Subject: RE: infiltration trench questions
The problem is that he built the system with these extra three not connected to the manifold before seeking approval. I
forgot to add that. Sorry! I totally agree that he should connect them to the manifold, but he is fairly adamant that its
ok and that it's built per the specs of StormTech.
Unfortunately the underdrain was previously permitted, so I don't have much say in it
From: Johnson, Kelly
Sent: Tuesday, June 23, 2009 7:24 AM
To: Patterson, Robert; Nelson, Christine
Subject: RE: infiltration trench questions
Is there some good reason why he can't connect them? It doesn't look like it would be that difficult?
From: Patterson, Robert
Sent: Tuesday, June 23, 2009 7:03 AM
To: Nelson, Christine; Johnson, Kelly
Subject: RE: infiltration trench questions
I believe that those 3 chambers would fill up not being connected, but I think they should still connect to the manifold.
There's no "access" to those 3 chambers otherwise. Is it really that hard to extend the manifold a few feet? What's that
underdrain doing in an infiltration system?

Robert D. Patterson, PE
Environmental Engineer
NCDENR I DWQ I Stormwater Permitting
1617 Mail Service Center, Raleigh, NC 27699-1617 (Mailing)
512 N. Salisbury St, Raleigh, NC 27604 (Location & Parcels)
[phone] Phone [phone] Fax
Email: robert.patterson(lncderingov (NOTE NEW EMAIL ADDRESS)
Website: httn://h2o.enr.state.nc.us/su/stormwater.html
'Please consider the environment before printing this email'
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties
From: Nelson, Christine
Sent: Monday, June 22, 2009 4:15 PM
To: Patterson, Robert; Johnson, Kelly
Subject: infiltration trench questions
Robert & Kelly,
I have a consultant who's designed an infiltration trench system with the help of Stormtech. They are modifying a
previously permitted system to add 3 chambers. The problem is that this extra row of chambers does not include a
manifold to allow the stormwater to directly enter that row. (see the attached file StormTech3)
In my request for additional information, I asked them to extend the manifold to connect these additional chambers to
the rest of the system. They claim that the chambers will fill up on their own and do not need to be connected to the
manifold. They have submitted some paperwork to support this claim. (attached files: StormTechl and StormTect2) I'm
sorry for the quality of these files, our normal Admin Assistant is out today.
Have you seen this proposed before? Do you agree that it does not need to be connected to the manifold?
Any advice would be helpful!
Thanks,
Christine
Please note my e-mail address has changed to: [e-mail]
Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.

KimleyHorn
and Associates, Inc.
April 27, 2009
Ms. Christine Nelson
North Carolina Dept. of Environment and Natural Resources
Division of Water Quality
127 Cardinal Drive Ext.
Wilmington, NC 28405
Re: First Citizens Bauk
Stonnwater Project No. SW8080744
Dear Ms. Nelson:
In response to your comments issued on 4/16/09, KI IA has provided the
following information.
I. A letter from Slorratech with supporting calculalions that
illustrates how stormwater is conveyed through the open
graded stone into the respective chambers.
2. Sheet C12 has been revised to show Clue location of the
underdraias connecting the outlet control structure.
Ifyou need any additional information or have any questions or comments, feel
Free to coutactme directly at 919-653-2990.
Very truly yours,
KIMLL'Y-HORN AND ASSOCIATES, INC. C�
I/y D -V /+
John D. Kuzeuski, P.B.
Enclosures: Two (2) copies of revised sheet C 12
One (1) Slormtech Letter
Cc: Tom Morris, I'CI3
File
■
TEL [phone]
FAX [phone]
APR 2 8 2009
WA
■
P.O. Box 33068
Raleigh, North Carolina
276363068

APR 2 8 2009
BY:
Interoffice Memo
To: File
Cc:
6
St®rmTech-
0.: aw-Fwnlu,—RcA?rga
Subsurface Stormwater Managernenl"
Pages:1
From: David J. Mailhot, PE
Date: August 24, 2005
Subject:
Using the Darcy Equation to Estimate Flow Through Open Graded Stone
The Darcy Equation: Q = k i A
Where:
k = permeability coefficient
i = hydraulic gradient
A = flow area
"k" values
Where:
k = permeability of the media (stone)
AASHTO M43 Effective
Darcy "k"
values'
Stone Description
Size Number Channel dial
ft/day
ft/sec
1" to 1 '/2"
#3 0.2
140,000
1.6 ft/sec
/Z" to 1"
#357, 4, 467,5 0.11,
50,000
0.6 ft/sec
#4 to 3/8"
#56, 57 0.03"
8,000
0.1 ft/sec
"i" values: i = Oh / L
Where: Ah = head
L = flow length through media
For flow between chambers Lm;n=15". Measure "L" midway through flow area
assuming a gradual change in direction and use L=41"
"A" value:
Where: A is the area perpendicular to the flow direction. For flow under
chambers with 6" depth of bedding stone, use A = 0.5 ft2/ft x 7.12 ft/chamber.
Or A = 3.56 ft2 / chamber.
Flow estimate:
Qchamber direction =k A
•�
c ram �r
one
For k=0.6
.�� jifs- � � �
= 0.6 ft/sec (30in/41 in) 3.56 ft2
1.6 cfs / chamber (one direction)
30 max
If k=0.1 ft/sec Q=0.26 cfs
=1 41�
Velocity
estimate:
For k=0.6
-III III II'
II. III. I!I
n--Ill III III`—lll ilI-
a --I .IIt III -III III .III —1 III-1
� II IL _III —III III —III —II —III
-IIF I-
'I'�, 1 II. -III III, III—IIL,iII-1
- 15"-

Velocity (cant)
V = 0.6 ft/sec (30in/41 in)
V = 0.4 ft/sec
If k=0.1 V=0.07 ft/sec
Time Estimate
T = 41 in (1 ft/12in) / 0.4 ft/sec
T=9sec
If k=0.1 T=49 sec
Summary Points:
1. The maximum allowable head could be based on the top of stone over the
chamber since the chamber system design is generally based on the full
storage envelope. Hence the hydraulics associated with a maximum water
surface elevation at the top of stone is assumed to be acceptable.
2. Our calculations allow 6" of freeboard since we are calling the maximum head
at the top of the chamber, not top of stone.
3. Flow through the stone in one direction based on the minimum depth of stone
(6") will vary from 0.3 cfs to 4.2 cfs depending on the stone gradation.
4. These calculations support statements in the Section 6.7 of the StormTech
Design Manual for "at least 0.5 cfs through the surrounding stone" for a single
StormTech chamber.
5. For StormTech design purposes, 0.5 cfs/chamber will be held and the
following values used:
a. 0.5 cfs / chamber
b. 0.25 cfs in one direction
c. 3.56 sq ft flow area in one direction
d. travel distance between chambers 41"
e. Stone Gradation "k" Velocity Travel Time
# 3 1.6 ft/sec 1.2 ft/sec 3 sec
#357, 4, 467, 5 0.6 ft/sec 0.4 ft/sec 9 sec
#56, 57 0.1 ft/sec 0.07 ft/sec 49 sec
1. Seepage, Drainage and Flow Nets, by Harry R. Cedergren, 1989 John Wiley &
Sons.

NCDENR
North Carolina Department of Environment and Natural Resources
Beverly Eaves Perdue
Governor
April 16, 2009
Division of Water Quality
Colleen H. Sullins
Director
Mr. Thomas B. Morris, Senior Vice President
First Citizens Bank and Trust Company
PO Box 27131
Raleigh, NC 27611
Subject: Request for Additional Information
Stormwater Project No. Still 080744
First Citizens Bank
Brunswick County
Dear Mr. Morris:
Dee Freeman
Secretary
The Wilmington Regional Office received a modified State Stormwater Management Permit
Application for the First Citizens Bank on February 19, 2009. A preliminary review of that
information has determined that the application is not complete. The following information is
needed to continue the stormwater review:
1. The proposed three (3) additional Stormtech Chambers on plan sheets C5, and C10 are
not connected to the inlet manifold. Please extend the manifold to connect these
additional Stormtech Chambers.
2. Please include the underdrains on the outlet structure detail on plan sheet C12 to
demonstrate how these pipes outlet from the infiltration trench system.
The following is not a requirement for approving the proposed modification:
The site is draining to SA/HQW waters, an important resource to the coastal
communities. The stormwater system, as permitted, appears to be designed to act more
like an underground dry detention pond instead of an infiltration trench. This system
appears to have been approved with an outlet device (including underdrains and an
orifice) that will assist in the draw down of the required storage volume. Infiltration
systems should be designed to store the required volume for infiltration into the soil with
the only outlet being an overflow weir to bypass the excess runoff.
The Division is asking you to consider helping in our mission to preserve, protect, and
enhance water quality by:
a. plugging the orifice in the outlet structure.
b. capping the underdrains if they discharge to the outlet structure beyond the weir
wall. The capped underdrains can be utilized for future maintenance activities
(refer to Section 16.3.8 of the NC BMP manual).
These actions will help to fully utilize the infiltration system as intended by infiltrating
stormwater runoff and reducing the runoff directly reaching surface waters. If these
actions are to be completed, please update the plans to reflect the changes (including
plan sheet C12).
Please note that this request for additional information is in response to a preliminary review.
The requested information should be received in this Office prior to May 17, 2009, or the
application will be returned as incomplete. The return of a project will necessitate resubmittal of
all required items, including the application fee.
Wilmington Regional Office
121 Cardinal Drive Extension, Wilmington, North Carolina 28405 One
\ Phone: [phone] FAX: [phone] Customer Service:l-877-623-6748 - NOiftlCcir01111a
Internet: www ricivaterquality,org
Naturally
\ aabural y
An Equal OpportunitylAffirmative Action Employer

Thomas B. Morris
April 16, 2009
Stormwater Application No. SW8 080744
If you need additional time to submit the information, please mail, email or fax your request for a
time extension to the Division at the address and fax number at the bottom of this letter. The
request must indicate the date by which you expect to submit the required information. The
Division is allowed 90 days from the receipt of a completed application to issue the permit.
The construction of any impervious surfaces, other than a construction entrance under an
approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject
to enforcement action pursuant to NCGS 143-215.6A.
Please reference the State assigned project number on all correspondence. Any original
documents that need to be revised have been sent to the engineer or agent. All original
documents must be returned or new originals must be provided. Copies are not acceptable. If
you have any questions concerning this matter please feel free to call me at [phone] or
email me at [e-mail].
Sincerely,
C.�qwDe,
Christine Nelson
Environmental Engineer
GDS/can: S:\WQS\STORMWATER\ADDINFO\2009\080744.apr09
cc: Peter A Bishop, Kimley — Horn and Associates, Inc.
Christine Nelson
Wilmington Regional Office
Page 2 of 2

w
NCDENR
North Carolina Department of Environment and Natural Resources
Beverly Eaves Perdue
Governor
April 16, 2009
Division of Water Quality
Coleen H. Sullins
Director
Mr. Thomas B. Morris, Senior Vice President
First Citizens Bank and Trust Company
PO Box 27131
Raleigh, NC 27611
Subject: NOTICE OF INSPECTION
First Citizens Bank
Permit No. SW8 080744
Brunswick County
Dear Mr. Morris:
Dee Freeman
Secretary
On April 8, 2009, Christine Nelson of the Wilmington Regional Office of the Division of Water
Quality (DWQ) inspected the First Citizens Bank in Brunswick County to determine compliance
with Stormwater Management Permit Number SW8 080744 issued on August 21, 2008. DWQ
file review and site inspection revealed that the site is compliant with the terms and conditions of
this permit. Please find a copy of the completed form entitled "Compliance Inspection Report"
attached to this letter.
Please be advised that you are required to comply with the terms, conditions and limitations of
your Stormwater Management Permit under Title 15A North Carolina Administrative Code 2H
.1003 and North Carolina General Statute 143-214.7, including operation and maintenance of
your permitted stormwater system.
If the project has changed name, ownership or mailing address, a formal change of
name/ownership form must be submitted to DWQ within 30 calendar days detailing the change.
Please provide the name, mailing address and phone number of the person or entity that is now
responsible for this permit.
Please be advised that violations of your Stormwater Management Permit may be subject to the
assessment of civil penalties of up to $25,000 per day per violation. If you have any questions
please contact Christine Nelson at the Wilmington Regional Office, telephone number (910)-
796- 7215.
SincQereelly, ?
Christine Nelson
Environmental Engineer
Enclosure: Compliance Inspection Report
GDS\can: S:\WQS\STORMWATER\INSPECT\080744.apr09
cc: John Hennessy-NPS-ACOU
Christine Nelson WiRO Files
Wilmington Regional Office
127 Cardinal Drive Extension, Wilmington, North Carolina 28405 One
Phone: [phone] \ FAX: [phone] \ Customer Service: 1-877-623-6748 North Ca T oli na
Internet: www,ncwaterquality.org Naturally
An Equal Opponunity l Affirmative Action Employer

Compliance Inspection Report
Permit: SW8080744 Effective: 08/21/08 Expiration: 08/21/18 Owner: First Citizens Bank and Trust Company
Project: First Citizens Bank
County: Brunswick 8900 E Oak Is Dr
Region: Wilmington
Oak Island NC 28465
Contact Person: Thomas B Morris Title: Phone: [phone]
Directions to Project:
Project is located in the NE corner of the intersection of East Oak Island Dr. & McGlamery Street in the town of Oak Island.
Type of Project: State Slormwater - Infiltration System
Drain Areas: 1 -
On -Site Representative(s):
Related Permits:
Inspection Date: 04/0812009 Entry Time: 10:00 AM
Primary Inspector: Christine Nelson
Secondary Inspector(s):
Reason for Inspection: Other
Permit Inspection Type: State Stormwaler
Facility Status: ❑ Compliant ❑ Not Compliant
Question Areas:
® State Slormwater
(See attachment summary)
Exit Time: 10:30 AM
Phone:[phone]
Inspection Type: Stormwater
Page: 1

Permit: SW8080744 Owner - Project: First Citizens Bank and Trust Company
,
Inspection Date: 04/08/2009 Inspection Type: Stormwater Reason for Visit: Other
Inspection Summary:
Site is still under construction but the infiltration trench system has been installed. Construction superintendent did
indicate that the extra three (3) stormtech chambers proposed with the permit modification have already been installed.
File Revipw
Is the permit active?
Signed copy of the Engineers certification is in the file?
Signed copy of the Operation & Maintenance Agreement is in the file?
Copy of the recorded deed restrictions is in the file?
Comment: Site still under construction.
SW Measures
Are the SW measures constructed as per the approved plans?
Are the inlets located per the approved plans?
Are the outlet structures located per the approved plans?
Comment: Infiltration trench already constructed and under packed gravel.
Operation and Maintenance
Are the SW measures being maintained and operated as per the permit requirements?
Yes No NA NE
® ❑ ❑ ❑
nE00
Is❑❑❑
❑ ❑ ® ❑
Yes No NA NE
❑ ❑ ❑
®❑ ❑ ❑
® ❑ ❑ ❑
Yes No NA NE
®❑ ❑ ❑
Are the SW BMP inspection and maintenance records complete and available for review or provided to DWO ❑ ❑ ❑
upon request?
Comment:
Page: 2

RE: FW: status of construction for First Citizens Bank in Oak Island?
I .
Subject: RE,: FW: status of construction for First Citizens Bank in Oak Island?
From: <John.Kuzenski n kimley-horn.com>
Date: Mon, 6 Apr 2009 17:07:37 -0400
To: <Christine.Nelson a ncmail.net>
CC: <[e-mail]>
Christine,
The 14.70 elevation is the 1 year 24 hour storm water surface elevation. This
orifice will allow some runoff to leave the system during .larger rain events, but the
system is designed to not exceed pre -development flow rates for the 1 year and 10
year 24 hour storm events. The Town of Oak Island requires pre/post detention of the
1 year and 10 year 24 hour storm events. The outlet structure configuration was
designed to meet the detention requirements of the Town. This rationale is explained
in tabular format in Appendix C and Appendix E of the Stormwater Analysis report.
O
The Stormtech system is designed for both water quality and quantity and the
calculated size of the system is governed by the most restrictive requirement. In
this case, the required water quality volume exceeded the volume required for
detention; therefore the system was enlarged to accommodate the water quality
requirements while still meeting the required pre/post detention criteria. Hope this
explanation helps. Feel free to call with questions.
Thanks,
John Kuzenski, P.E.
Kimley-Horn & Associates, Inc.
3001 Weston Parkway
Cary, NC 27513
Phone: [phone]
Fax: [phone]
-----Original Message -----
From: Christine Nelson[mailto:[e-mail]]
Sent: Monday, April 06, 2009 4:20 PM
To: Kuzenski, John
Subject: Re: FW: status of construction for First Citizens Bank in Oak Island?
Thanks - I did miss type the location of the project.
One more question, why is there a rectangular orifice in the weir wall of the outlet
structure at 14.70 ft when the design storm is at 17 ft?
Christine
[e-mail] wrote:
tion from my previous email. Town of Oak Island.
Thanks,
John Kuzenski, P.E.
Kimley-Horn & Associates, Inc.
3001 Weston Parkway
Cary, NC 27513
Phone: [phone]
Fax: [phone]
I of 2 4/6/2009 5:14 I'M

FW: status of construction for First Citizens Bank in Ocean Isle?
C5k I5��
Subject:1,W: status of construction for First Citizens Bank irrerearr+,40
From: <[e-mail]>
Date: Mon, 6 Apr 2009 14:23:00 -0400
To: <Christine.Nelson cr ncmai1.net>
Correction from my previous email. Town of Oak Island.
Thanks,
John Kuzenski, P.E.
Kimley-Horn & Associates, Inc.
3001 Weston Parkway
Cary, NC 27513
Phone: [phone]
Fax: [phone]
-----Original Message -----
From: Kuzenski, John
Sent: Monday, April 06, 2009 2:19 PM
To: 'Christine Nelson' 1
Cc: Bishop, Peter ` c V's S1a^�\-
Subject: RE: status of construction for First Citizens Bank in Geeen is e?
Christine,
The Stormtech System has been installed per the plans. Just to clarify, the project
is within the Town of Oaks Island. Feel free to call with questions. Thanks.
John Kuzenski, P.E.
Kimley-Horn & Associates, Inc.
3001 Weston Parkway
Cary, NC 27513
Phone: [phone]
Fax: [phone]
-----Original Message -----
From: Christine Nelson[mailto:[e-mail]]
Sent: Monday, April 06, 2009 11:09 AM .0
To: Kuzenski, John
Subject: status of construction for First Citizens Bank ins
John,
Thank you for answering my questions regarding the proposed modification to First
Citizens Bank in �-.... Can you provide the status of construction for the
infiltration trench? Da4 5y�µ a
Thanks,
Christine
Email correspondence to and from this address may be subject to the North Carolina
Public Records Law and may be disclosed to third parties.
I of 1 4/6/2009 2:45 PM

First C;tizens Bank -Oak Island NC-NCDWQ Inquiry
Subject: First Citizens Bank -Oak Island NC-NCDWQ Inquiry
From: <[e-mail]>
Date: Fri, 27 Feb 2009 14:07:11 -0500
To: <[e-mail]>
CC: <[e-mail]>, <[e-mail]>
Christine,
Per our conversation this morning I am providing you with some additional information to assist you in finalizing
Your completeness review. The three items you requested are listed below:
Revised Narrative:
The owner requested that additional parking be added to the site plan adjacent to the proposed building for staff
parking. This revision has been approved by the Town of Oak Island and is shown on the current civil
construction plans. The net increase of impervious area added to the site was 0.04 acres. As a result, three
additional Stormtech Chambers were added to the existing system to meet the appropriate water quality and
quantity requirements for this project. These minor changes are addressed in this revision submittal to amend the
previously approved Stormwater Permit issued by NCDWQ on 8/21/09.
Status of Construction:
The latest available site visit report that describes the improvements already constructed on site have been
included in this report.
Drainage Area Calculation:
The pre and post development drainage areas are based on the area of the site parcel. The project was previously
approved by NCDWQ using this assumption.
John Kuzenski, P.E.
Kimley-Horn & Associates, Inc.
3001 Weston Parkway
Cary, NC 27513
Phone: [phone]
Fax: [phone]
Content -Description: Oak Island 12.30.08 Site Visit
Report.pdf
Oak Island 12.30.08 Site Visit Report.pdf Content -Type: application/pdf
Content -Encoding: base64
l of 1 2/27/2009 2:20 PM

SITE VISIT REPORT
December 30, 2008
First Citizens Bank — Oak Island
8900 E. Oak Island Drive
Oak Island, NC
Project #080657
Rain
Studi
Arehireemre ■ C:onstmedon Administration a
Lender Review Service
Time: 2:00 PM
Workmen: SUPERINTENDENT:
+ 1
Temperature: +600
GC
±1
Weather: Sunny
EC:
+ 2
PC:
+ 0
MC:
+ 0
UTILITY:
+3
Present:
Mike Hawley, Superintendent Denver Construction Company (DENVER)
Jim Rains, AIA Rains Studio, PA (RSPA)
The following items were observed and discussed:
SITE: Work In Proaress During Visit
1. Installation of underground electrical service to building and site lighting
2. Setting of electrical transformer
SITE: Work In Place or Previously Underway
1. Back filling of curb with topsoil
2. Underground rough in of utility services
BUILDING: Work in Proaress During Visit
1. Installation of anchor bolts at perimeter of stud walls
2. Slab preparation for future installation "of built on site vault"
Post Office Box 308
1510 Main Street, Suite D
Ramseur, NC 27316
Office: 336.824.8990
Fax: 336,824.8217
Mobile: [phone] (Jim)
Mobile: [phone] (Dennis)
w .rainsstudio.com
Page 1 of 2

BUILDING: Work In Place or Previously Underway
1. Installation of perimeter wall metal studs
2. Installation of roof trusses
3. Installation of roof sheathing
4. Installation of ice and water shields at roof sheathing
5. Installation of foil face batt insulation at the trusses
OBSERVATIONS:
1. The drive-thru roof trusses which had been previously installed have been removed and stored on
site (see photographs)
2. During the visit lengthy discussion was held with Mike Hawley, Superintendent, concerning the
future modifications to the exterior of the building. Mike is awaiting revised drawings to direct
further work and rework to the structure
3. The project schedule has been delayed due to building modifications taking place. It appears that
as much as a 30 day delay has occurred due to rework and lack of possible productive work while
design modifications are being considered
4. All work that is possible to be underway has been undertaken by Denver Construction where
possible. (For example installation of underground utilities, back filling of curb, etc.).
STORED MATERIAL ON SITE:
1.
Metal studs
2.
Framing lumber
3.
DensGlass sheathing
4.
Storm drainage piping
5.
Sheet rock
END OF REPORT
REPORT BY:
Jim Rains, AIA
ATTACHMENTS:
Photographs
Cc:
Wayne Raynor, First Citizens Bank
Michael Parker, AIA, First Citizens Bank
Faye Barwick, First Citizens Bank
Shane Webster, Small Kane Architects
Peter Bishop, Kimley-Horn and Associates
Chris Crow, Morrison Engineers
David Bell, Adcock Engineering
Hal Martin, Adcock Engineering
Kenneth Tucker, Denver Construction Company
Mark Elmore, Denver Construction Company
Mike Turner, BranchSery
John Whitaker, BranchSery
Damon Brock, Brock Contract Service
Wayne Burton, Burton Electric Signs
John Sartori, Diversified Systems
Ladd Nelson, Ladd Architectural Wall Systems
Randolph Ford, Pridgen Woodworks
David Wells, Security Erectors
Stan Sieder, Spaulding Craft
Rob Burlington, SteelFab of Virginia
Scott Arena, Stock Building Supply
Stuart Walston, Stuart Walston, Inc.
Dennis Brown, PE, Rains Studio
Jim Rains, AIA, Rains Studio
Page 2 of 2
Oak Island 12.30.08 SVR

Oak Island Oak Island 12.30.08 -Pictures'
> fifty(
01 Underground r A3 Metal $tuQ$
Q?L .Vault Slab
Electrical Installed i oa Metal Snuffs
Rework Installed
05 Exterior 06 Trusses Removed j 07 Topsoil/Curb
View From Drive-thru I Backfill 08 Drive-thru
_41 View
Al
09 Electrical
IO.Stured.Studs
Underground Ll Insulation/ -Foil-
On Site Face histallcd 12 Stored Shu.-t
s Rack
it Y L
' 'f i
13 Front Wevntion 14 "I'ransformcr — - --
Installation in Progress - ' 15 Rear Entry Road- I ti-Overall View
0 17 Utitity Vault-

i Project Name: /l5 i /:. > I Ramiewer: C_ A/ Date://1/o/0
ect Received Date: 2--
I Project Location: (iD. ' I Add info reouired(i6es/iiho). Date received: a/a7/b? I
Rule(s) Subject (check all that
Symbols for completing form: '✓'= Yes/OK ' x'= No/Deficient 'n/a' or T or'/'
app�ly)�•• /
El1995 Coastal L 2008 Coastal ur Phase II ❑ Universal
7 Check for $505 (must be no older than 6 months)
Application form with correct/original signatures (original plus 1 copy). If Corporation or LLC also:
o Print the info from the NCSOS
o Either, 1.) The applicant is listed on the NCSOS with his/her correct title or, 2.) A notarized letter of
\e`X�/ authorization has been provided: tt�
p supplements (1 original per BMP). BMP type(s): n3Ab," ijrh �fQv�('�
O&M with correct/original signatures (1 original per BMP, except level spreaders/filter strips and swales)
°'O�Deed restrictions (if outparcel or subdividing) (original plus 1 copy)
o Deed restriction template (signed and notarized) or
o Proposed Declaration of Covenants and Restrictions (signed and notarized)
Soils report identifying the SHWT
� upporting calculations, signed & sealed (if necessary)
Receiving stream classification: -'5q , If SA or ORW also:
o SA: USGS topo map with the site, the receiving waters and the''/2 mile radius shown to scale.
o ORW: 575 it of MHWL for Area of Environmental Concern and max BUA per rule.
N1Qy Modifications: 1.) If built: Designer's Cert., 2.) If partially built: Partial Cert., 3.) If not built: No Cert. needed.
Development Type (check all that apply):/
❑ Residential or ®commercial ❑ Deed restrictions match?
❑ Subdivision or Single Lot ❑ Deed restrictions match?
Ll✓High Density or ❑ Low Density / ❑ Deed restrictions match?
❑ Offsite project ❑ Redevelopment Q" Modification ❑ Exempt
❑ NCG02 (bulkhead) ❑ NCG03 (clear/grade) ❑ NCG04 (linear)
Densi :
BUA calculations include common areas, clubhouse, sidewalks, etc.
1PUA W ii3 Matches high/low density requirement for rule and receiving stream class.
1 No obvious math errors
CJ If High Density: Design storm correct for rule and receiving stream class.
Plans,ygned and sealed (2 sets):
U- Two sets received 4d' Layout (with proposed BUA dimensions)
Grading ❑ Drainage area map (all HD system�.& curb outlet swales) t7fY(11 0
c rQ�
E1" Vicinity map ZProject Boundaries Legend 1
❑ Wetlands:
0o Delineated on plans o "No wetlands onsite" on plans
•Details:
o Roads o Cul-de-sacs o Curbing o Sidewalk
o BMPs/ Level spreaders/ Filter strips/ Curb outlet swales o Buildings (Apts or Condos)
Off ite Projects:
❑ Designer's Certification has been submitted for the Offsite BMP receiving the runoff from the project.
❑ Deed restrictions have been recorded and a copy submitted for the Offsite BMP permit.
Lot size has not changed from what was approved under the Master Plan.
Correct lot number is referenced on the supplement form.
Offsite system is in compliance with its permit, if known.
Infiltrati9n Projects: �w (Q
�i Soils report: SHWT, soil type, and expected infiltration rate are provided. �,f k-JNw`'\")(
Ef DWQ has conducted a site visit? Date: U
Wet Ponds: Permanent Pool Meets One of the Following:
Is located no lower than 6" below the estimated SHWT.
Incoming groundwater is quantified and evaluated, AND Storage volume verified, AND Outlet evaluated for free
drainage to the receiving waters under SHWT conditions.
Decision (check one):
❑ Complete: Return file to admin (Jo Casmer) to log in. (Stamped in received date = BIMS date)
l Slightly incomplete: E-mail consultant, request information to be returned within one business day (24 hours after
request. Info requests on Friday, allow a return on the following business day). If info not returned, issue an
application return letter and give everything to admin. (Add info received date = BIMS date)
❑ Substantially incomplete: Issue an application return letter and give everything to admin.

X
3
we
L1
0
s
WKI
s
X
X
q5

®M" Kimley-Horn
® and Associates, Inc.
February 17, 2009
NCDENR
Division of Water Quality
Wilmington Regional Office
127 Cardinal Drive Extension
Wilmington, NC 28405
Subject: First Citizens Bank
8900 East Oak Island Drive �0
Oak Island, NC 28465
Our Ref. 011737152
Permit Reviewer:
Kimley-Horn and Associates is submitting a Stormmater Management permit
Application Modification package for your review. The following items have been
included in this submission:
■
P.O. Box 33068
Raleigh, North Carolina
2763036E
• One (1) original and one (1) copy of Stormwater Management Permit Application
Form.
• One (l) Infiltration "Drench Supplement.
• One (1) signed and notarized Operation and Maintenance Agreement.
*cope q% original provided — original on file as part oforiginal permit application
(no change to Operation and Maintenance Agreement)
• Two (2) sets of Construction Plans.
• Two (2) copies of Stormwater Analysis Report.
• One (1) copy of Gcotechnical Report by Soil & Environmental Consultants.
• One (1) copy of Geotechnical Report by Geo7-echnologies, Inc.
• One (1) check lot- Permit Review Fee (check 4002071449, $505.00)
If you need any additional information or have any questions or comments, feel free to
call me directly at 919-653-2990.
Very truly yours,
KIMLEY-I-TORN AND ASSOCIATES, INC.
.lobo Kuzcnski, P.E. FEB 1 9 2009
cc. — Tom Morris, FCB File BY.
0
TEL [phone]
FAX [phone]

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®O❑ FIRST CITIZENS BANK FIGURE
CONTROL STRUCTURE
Kimsey -Horn and Associates, Inc. OAK ISLAND, NC X1
THIS DOCUMENT, TOGETHER WITH THE CONCEPTS AND DESIGNS PRESENTED HEREIN, AS AN INSTRUMENT OF SERVICE, IS INTENDED ONLY FOR THE PURPOSE AND CLIENT FOR WHICH IT WAS PREPARED. REUSE
OF AND IMPROPER RELIANCE ON THIS DOCUMENT WITHOUT WRITTEN AUTHORIZATION AND ADAPTATION BY KIMLEY-HORN AND ASSOCIATES, INC. SHALL BE WITHOUT LIABILITY TO KIMLEY-HORN AND ASSOCIATES, INC.

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DRAINAGE AREA: 1.32 ACRES
IMPERVIOUS AREA: 0.38 ACRES
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SOIL TYPE: KUREB (KrB) TYPE 'A'
CURVE NUMBER: 56
TIME OF CONCENTRATION: 5 MIN.
PRELIMINARY
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NORTH CAROLINA

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t Scale: 1 inch equals 1333 feet Intersection of East Oak Island Drive and McGlamery Street

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