SW8990719_Historical File_19990816

c,
Sfaie of 1�o>4h Carolina
Department of Environment
and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Division of Water Quality
Mr. B. Edward Hill
NorthChase Auto -Shine, L.L.0
807 Wood Cove Road
Wilmington, NC 28409
Dear Mr. Hill: `
NCDENii
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL. RESOURCES
August 16, 1999
Subject: Permit No. SW8 990719
NorthChase Auto -Shine
Offsite Stormwater Project
New Hanover County
The Wilmington Regional Office received a complete Stormwater Management Permit Application for NorthChase Auto -
Shine on July 19, 1999. Staff review of the plans and specifications has determined that the project, as proposed, will comply
with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000. We are forwarding Permit No. SW8 990719, dated
August 16, 1999, for the construction of NorthChase Auto -Shine.
This permit shall be effective from the date of issuance until rescinded and shall be subject to the conditions and limitations
as spccified therein.
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 Noelle Lutheran, or me at
[phone].
Sincerely,
t-a-'t- C_"
Rick Shiver
Water Quality Regional Supervisor
RSS/nml: S:1WQSISTORMWATIPERMIT1990719.AUG
cc: John Kevin Klein, P.E.
Tony Roberts, New Hanover County Inspections
Mr. Charles W. Smith, Owner
Beth Easley, New Hanover County Engineering
Noelle Lutheran
Wilmington Regional Office
Central Files
127 Cardinal Dr. Ext., Wilmington, North Carolina 28405 Telephone [phone]o0 FAX [phone]
An Equal Opportunity Affirmative Action Employer 1 50% recycled/10% post -consumer paper

State Stormwater Management Systems
Permit No. SW8 990719
STA1 E OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT.
SERVED BY AN OFF -SITE STORMWATER CONTROL
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
NorthChaseAuto-Shine, L.L.C.
NorthChase Auto -Shine
New Hanover County
FOR THE
construction of impervious areas to be treated in an off -site permitted stormwater facility, in compliance with the provisions
of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules,) and the approved stormwater management plans
and specifications and other supporting data as attached and on file with and approved by the Division of Water Quality and
considered a part of this permit. The stormwater runoff from the site will be routed to a a wet detention pond operated and
maintained by Mr. Charles W. Smith, Owner under the terms and conditions set forth in Permit No. SW8 961104.
This permit shall be effective from the date of issuance until rescinded, and shall be subject to the following specified
conditions and limitations:
L DESIGN STANDARDS
This permit is effective.pnly with respect to the nature and volume of stormwater described in the application and
other supporting data.
2. This stormwater system has been approved for the management of stormwater runoff as described on page 3 of this
permit, the Project Data Sheet. The built -upon area allotted to this development by Stormwater Management Permit
#SW8 SW8 961104 is 52,272 square feet square feet. The project proposes 52,272 square feet.
3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the
permit.
2

State Stormwater Management systems
Permit No. SW8 990719
DIVISION OF WATER QUALITY
PROJECT DATA SHEET
Project Name: NorthChase Apartr��eats and Lot P
Permit Number: 961104
Location: New Hanover County
Applicant: Mr. Charles W. Smith
Mailing Address: 115 Hinton Avenue
Wilmington, North Carolina 28403
Application Date: November 12, 1996
Water Body Receiving Stormwater Runoff: Smith Creek
Classification of Water Body: "C Sw"
If Class SA, chloride sampling results:
N/A
Pond Depth:
5.5 feet
Permanent Pool Elevation:
31.5 MSL
Total Impervious Surfaces Allowed:
257,395 square feet
Lot P @80%
113,256 square feet
Offsite Area entering Pond:
None, per Engineer
Green Area entering Pond:
243,545 square feet
Required Surface Area:
16,083 square feet
Provided Surface Area:
16,457 square feet
Required Storage Volume:
21,392 cubic feet
Provided Storage Volume:
28,887 cubic feet
Temporary Storage Elevation:
33 MSL
Controlling Orifice:
2.5" pipe
3

State Stormwater Management Systems
Permit No. SW8 990719
II.. SCHEDULE OF COMPLIANCE
The stormwater manag„m-ent system shall be co usiructed in it's entirety, vegetated and operational for its intended
use prior to the construction of any built -upon surface except roads.
2. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired
immediately.
3. Mr. Charles W. Smith, Owner shall at all times provide the operation and maintenance necessary to assure the
permitted stormwater system functions at optimum efficiency. The approved Operation and Maintenance Plan must
be followed in its entirety and maintenance must occur at the scheduled intervals including, but not limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and revegetation of side slopes.
d. Immediate repair of eroded areas.
e. Maintenance of side slopes in accordance with approved plans and specifications.
f. Debris removal and unclogging of outlet structure, orifice device and catch basins and piping.
g. Access to the outlet structure must be available at all times.
4. The permittee is responsible for keeping the collection system on the lot clear of debris.
5. Mr. Charles W. Smith, Owner must keep records of maintenance activities make them available upon request to
authorized personnel of DWQ. The records will indicate the date, activity, name of person performing the work and
what actions were taken.
6. This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this
permit, the approved plans and specifications, and other supporting data.
7. Mr. Charles W. Smith, Owner is responsible for providing, prior to issuance of a Certificate of Occupancy, and prior
to operation of this permitted facility, a certification from an appropriate designer for the system installed, certifying
that the permitted facility has been installed in accordance with Stormwater Permit #SW8 961104, the approved plans
and specifications, and other supporting doculnentation. Any deviations from the approved plans and specifications
must be noted on -the Certification.
8. 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.
9. This lot is Iimited to the amount of built -upon area indicated in the'supporting calculations and per approved plans.
The project must have a built -upon area less than or equal to the amount permitted under Stormwater Permit #SW8
961104. Additional built -upon area will require a modification to the overall Permit.
10. Mr. Charles W. Smith, Owner is responsible for verifying that the proposed built -upon area does not exceed the
allowable built -upon area. Oncc the lot transfer is complete, the built -upon area may not be revised without approval
from the permittee, and responsibility for meeting the built -upon area limit is transferred to the individual property
owner.
11. No property owner/developer shall fill in, alter, or pipe any drainage feature (such as swales) shown on the approved
plans as part of the stormwater management system without submitting a revision to the permit and receiving
approval from the Division.
4

State Stormwater Management Systems
Permit No. SW8 990719
12: The following items will require a modification to the permit:
a. Any revision to the approved plans, regardless cif size.
b.. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area.
e. Further subdivision, acquisition or selling of the project area.
f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan.
13. The Director may determine that other revisions to the project should require a modification to the permit
14. The Director may notify the permittee when the permitted site does not meet one or more of the minimum
requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time
schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies
of revised plans and certification in writing to the Director that the changes have been made.
M. GENERAL CONDITIONS
This permit is not transferable. In the event there is a desire for the facilities to change ownership, or there is a name
change of the Permittee, a formal permit request must be submitted to the Division of Water Quality accompanied
by an application fee, documentation from the parties involved, and other supporting materials as may be appropriate.
The approval of this request will be considered on its merits and may or may not be approved.
2. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to enforcement
action by the Division of Water Quality, in accordance with North Carolina General Statute 143-215.6A to 143-
215.6C.
3. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules,
regulations, or ordinances which may be imposed by other government agencies (local, state, and federal) which have
jurisdiction. .
4. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, Mr. Charles
W. Smith, Owner shall take immediate corrective action, including those as may be required by this Division, such
as the construction of additional or replacement stormwater management systems.
5. The permittee grants permission for DENR Staff to enter the property for the purpose of inspecting all components
of the permitted stormwater management facility.
6. The permit may be modified, revoked and= reissued or terminated for cause. The filing of a request for a permit
modification, revocation and reissuance or termination does not stay any permit condition.
Permit issued this -the 16th day of August, 1999.
NORTH CAROLINA ENVIRONMENTAL. MANAGEWNT COMMISSION
Kerr T. Stevens, Director .
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number SW8 990719

State Stormwater Management Systems
Permit No. SW8 990719
NorthChase Auto -Shine
Stormwater Permit No. SW8 990719
New Hanover County
Designer's Certification
I, , as a duly registered in the
State of North Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the project,
(Project)
for (Project Owner) hereby state that, to the best of my abilities, due care and
diligence was used in the observation of the project construction such that the construction was observed to be built within
substantial compliance and intent of the approved plans and specifications.
Noted deviations from approved plans and specifications:
Signature
Registration Number
Date
SEAL
6

State Stormwater Management Systems
Permit No. SW8 990719
Certification Requirements:
1. The drainage area to the system contains approximately the permitted acreage.
2. The drainage area to the system contains no more than the permitted amount of built -upon area.
3 All the built -upon area associated with the project is graded such that the runoff drains to the system.
.4. The outlet/bypass structure elevations are per the approved plan.
5. The outlet structure is located per the approved plans.
6. Trash rack is provided on the outlet/bypass structure.
7. All slopes are grassed with permanent vegetation.
8. Vegetated slopes are no steeper than 3:1.
9. The inlets are located per the approved plans and do not cause short-circuiting of the system.
10. The permitted amounts of surface area and/or volume have been provided.
11. Required drawdown devices are correctly sized per the approved plans.
12. All required design depths are provided.
13. All required parts of the system are provided, such as a vegetated shelf, and a
forebay.
14. The overall dimensions of the system, as shown on the approved plans, are provided.
cc: NCDENR-DWQ Regional Office
Tony Roberts, New Hanover County Building Inspector
7

Mow -
Date Received
Fee Paid
Permit Number
- 9-
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
I. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
-- I�+b�LT�KJaS6 AJTO — �4►l ` L•.L, C
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Dwm-1t, lV.w t'MA-r,.%N(, MX-M
3. Mailing Address for person listed in item 2 above:
80'1 W60b CW6 QOAO
City W �uNt�at�ToN State:_ 11x Zip: Z84c�q
Telephone Number: (_ 9I0 ) '-191 _ Z�
4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on
plans, specifications, letters, operation and maintenance agreements, etc.):
{�10�4 C��s� �vtc -Se+►� *i6
5. Location of Project (street address):
- m's"A.ex, i�+e ��� , 1�1�•c CN�c6 �a+�x. aF Co•� w�g�zci
City W art �N ��-o a County: sew V� 4wloyew-
6. Directions to project (from nearest major intersection):
lac mow, W��KaN�.torJ c9� 1JG ! `i 132. %Co��6GE (IZty4t,� MAkE
Q\6t"T oona R. Ay- OF Cn~wLim tea or-) 9\&%i+T
7. Latitude: 34�, \8l Longitude: `l'Z a�2' of project
8. Contact person who can answer questions about the project:
Name: t!�) - Zb WA" 1-4+u- Telephone Number: ( 9 tO ) `7q 1- 2f,L(o
H. PERMIT INFORMATION:
1. Specify whether project is (check one): New Renewal ✓ Modification
Form SWU-101 Version 3.99 Page 1 of 4

2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the r..�
existing permit number SW 8 To 1104 and its issue date (if known) 1l-ZS- NP v'
3. Specify the type of project (check one):
Low Density High Density Redevelop General Permit Other
4. Additional Project Requirements (check applicable blanks):
_CAMA Major -'Sedimentation/Erosion Control _404/401 Permit _NPDES Stormwater
Information on required state permits can be obtained by contacting the Customer Service Center at
1-877-623-6748.
III. PROJECT INFORMATION
1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative
(one to two pages) describing stormwater management for the project .
�OL1,rc��m,J «zo n1C,0AAW-b'F WrTo DwQ
�t�Ju�rJIN(�. T`2ACT - P cW%JEGT .4,-SA %S Q M UaT
2. Stormwater runoff from this project drains to the Crtssy. River basin.
3. Total Project Area: 11 - SO acres
5. How many drainage areas does the project have? J
4. Project Built Upon Area: Sl •4 %
6. Complete the following information for each drainage area. If there are more than two drainage areas in the
project, attach an additional sheet with the information for each area provided in the same format as below.
TcSTA L PeGJECT OUR. 'S 1- E
Receiving Stream Name
,tom GQEek
Receiving Stream Class
G-5•..�
Drainage Area
1,
1 • SO 14 e-
Existing Impervious* Area
Proposed bn ervious*Area
S .
1, ZO Py-
% Impervious* Area (total)
51 . 4' a
to 41(.
On -site Buildings
t , Zp �� .
p . 0G Ate -
On -site Streets
-
—
On -site Parking l,�EwAV�S
l G
O At AG
On -site Sidewalks
_
Other on -site -OT• 4
, (.kc-
-N%m 0.7
Off -site
Total: S, 1
Total: ZO Ac.
" Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
Form SWU-101 Version 3.99 Page 2 of 4

7. How was the off -site impervious area listed above derived? NaaE 1+Erew�.� t gyp -t-p
cxrh,a lt-rto M2o1VCV
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
The following italicized deed restrictions and protective covenants are required to be retarded 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.
I. The following covenants are intended to ensure ongoing compliance with state stormwater management permit
number 5WA 9(a1104 as issued by the Division of Water Quality. These covenants may
not be changed or deleted without the consent of the State.
2. No more than 5Z , 7.1 square feet of any lot shall be covered by structures or impervious materials.
Impervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but do not include wood
decking or the water surface of swimming pools.
3. Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings.
4. Built -upon area in excess of the permitted amount requires a state stormwater management permit modification prior to
construction.
5- All permitted runoff from outparcels or future development shall be directed into the permitted stormwater control
system. These connections to the stormwater control system shall he performed in a manner that maintains the
integrity and performance of the system as permitted.
By your signature below, you certify that the recorded deed restrictions and protective covenants for this project
shall include all the applicable items required above, that the covenants will be binding on all parties and
persons claiming under them, that they will run with the land, that the required covenants cannot be changed or
deleted without concurrence from the State, and that they will be recorded prior to the sale of an lot
Y
V. SUPPLEMENT FORMS
The applicable state stormwater management permit supplement form(s) listed below must be submitted for
each BUT specified for this project. Contact the Stormwater and General Permits Unit at (919) 733-5M for the
status and availability of these forms.
Form SWU-102
Wet Detention Basin Supplement
Form SWU-103
Infiltration Basin Supplement
Form SWU-104
Low Density Supplement
Form SWU-105
Curb Outlet System Supplement
Form SWU-106
Off -Site System Supplement
Form SWU-107
Underground Infiltration Trench Supplement
Form ShcrU-108
Neuse River Basin Supplement
Form SWU-109
Innovative Best Management Practice Supplement
Form SWU-101 Version 3.99
Page 3 of 4

VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the 'Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the appropriate DWQ Regional Office.
Please indicate that you have provided the following required information by initialing in the space
provided next to each item.
• Original and one copy of the Stormwater Management Permit Application Form
• One copy of the applicable Supplement Form(s) for each BMP
• Permit application processing fee of $420 (payable to NCDENR)
• Detailed narrative description of stormwater treatment/management
• Two copies of plans and specifications, including-
- Development/Project name
- Engineer and firm
-Legend
North arrow
- Scale
- Revision number & date
- Mean high water line
- Dimensioned property/project boundary
- Location map with named streets or NCSR numbers
- Original contours, proposed contours, spot elevations, finished floor elevations
- Details of roads, drainage features, collection systems, and stormwater control measures
- Wetlands delineated, or a note on plans that none exist
- Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations
- Drainage areas delineated
- Vegetated buffers (where required)
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.
Designated agent (individual or firm): �4�s�O R06tassWntata A Jr:, Asscra 4TtkS
Mailing Address: 34\o LIE
City: State: 0 C Zip: 28 463
Phone: ( 9 % 0 ) '199-7q(0'7 Fax: Jq�—OSgq
VIIL APPLICANT'S CERTIFICATION
I, (print or type name of person listed in General Information, item 2) % • 'Et,wA42'b 4kU-
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A
NCAC 2H .1000.
SiQnatur��
I Date: �� 2
Form SWU-101 Version 3.99 Page 4 of 4

Permit No-5212
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
OFF -SITE SYSTEM SUPPLEMENT
FOR DEVELOPMENT DRAINING TO PERMITTED OFF -SITE TREATMENT SYSTEMS
This form may be photocopied for use as an original
DWQ Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a stormwater management permit application, an
off -site system supplement for each off -site stormwater treatment system, appropriate supplement forms for
any on -site stormwater treatment systems, and plans and specifications showing all stormwater conveyances
and drainage details for the project.
I. PROJECT INFORMATION
Project Name : — I-)e�e-r�sG�,y��
Contact Person: J4%%.t. Phone Number: (Otto l "Iac1-
Is all drainage from the project directed to the off -site system? (circle one): Yes No
U. OFF -SITE SYSTEM INFORMATION (please complete the following information for the off -site
system that will treat runoff from your project):
Permit No. SW €3 SGWA
Project Name: tl10Wr%6KAIM AP,40vrtA%r rM A"h U-r 1�
Type of System (wet pond, infiltration basin, etc.): Way- T>ewt_,
Lot No. (if part of a subdivision): Lcr*r p
How much built upon area draining to the permitted treatment system has been allocated to this
project? gel., � 5z . Z`l1 sF�
III. REQUIRED ITEMS CHECKLIST
—nor to issuing an off -site permit, verification of the following information must be provided. initial in the
space provided to indicate that the following requirements have been met and supporting documentation is
attached. If the applicant has designated an agent in the Stormwater Management Permit Application Form,
the agent may initial below. If a requirement has not been met, attach justification.
Form SWU-106 Ver 3.99 Page 1 of 2

i
Applicants Initials
'jr a. Deed restrictions limiting the built -upon area on the site have been rec'ded.
a� b. Engineers certification for the existing off -site system has been submitted to DWQ.
c. There are no outstanding Notices of Violation for the off -site system.
d. Off -site system is in compliance with the issued permit.
IV. STORMWATER COLLECTION SYSTEM MAINTENANCE REQUIREMENTS
1. Mowing will be accomplished as needed according to the season. Grass height will not exceed six inches
at any time.
2. Accumulated sediment and trash will be removed from the collection system as necessary. Swales and
ditches will be reseeded or sodded following sediment removal.
3. Eroded areas of swales and ditches will be repaired and reseeded. Swales and ditches will be revegetated
as needed based on monthly inspections.
4. The collection system, including catch basins, curb cuts, velocity reduction devices, and piping, will be
inspected monthly or after every significant runoff producing rainfall event. Trash and debris will be
cleared away from grates, curb cuts, velocity reduction devices, and piping.
5. The collection system may not be altered in any way without prior approval from NCDENR Division of
Water Quality.
I acknowledge and agree by my signature below that I am responsible for maintaining the stormwater
collection system in accordance with the five maintenance procedures listed above. I agree to notify DWQ of
any problems with the system or prior to any changes to the system or responsible party.
Print Name and Title: % EP>w Ax's 14'
Address: Soly.A a oil NC 2-$401S
Phone: (C \o1 -191- Z.(o(o _ ate:
Note: The legally responsible parry should not be a homeowners association unless more than 50% of the lots have been sold and
a resident of the subdivision has been named the president.
1Kay E. Seeger , a Notary Public for the State of North Carolina , County of
New Hanover , do hereby certify that B . Edward Hill personally appeared before me this
28th
day of June, 1999 , and acknowledge the due execution of the forgoing infiltration
basin maintenance requirements. Witness my hand and official seal,
V
Notary ublic
SEAL
My commission expires - / Y_ o) dlo
Form SWU-106 Rev 3.99 Page 2 of 2

KLEIN ENGINEERI
AND ASSOCIATES
T,;ly 121 QQQ
Af. T ;-A- T o
1V1J. L111UCL LV VV lj
NCDENR
DIY J1V11 of A tei Q-1; -
127 Cardinal Drive Extension
Ti7.-1111gton, NY- 2QTv�5=3S45
V -1410 Wrightsville Avenue
JUL 19 1999 Wilmington, NC 28403
[phone]
FAX [phone]
File ATo.: 99001
Re: RTnrfl�f`haea� Aiitn_C�'hina tnii+norrral nfNTnr+hr"laaa Apartments), Nev�'Hanover C�^.unt`y'
.v.....�.....wv . i�aw v `....,.at..s. vv. ...i rllvi....av i
Request for Modification to Permit
DWQ Pcrmit No.: SW8 961104
Dear Ms. Lewis:
On behalf of NorthChase Auto -Shine, LLC, please find enclosed submittal for revisions to the
NorthChase Apartment project. This submittal includes design of a portion of the outparcel
designated as Lot `'P" on the original Drawings. Enclosed for your review are the following items:
Original plus one (1) copy of the Stormwater Management Permit Application form
One (1) copy of applicable Supplement form
Permit application process fee in amount of $420
Two (2) copies of the Drawings
Two (2) copies of the Narrative Package which include Calculations
Should there be any questions concerning the enclosed information or additional copies desired,
please feel free to contact our office.
Sincerely,
KLEIN ENGINEERING AND ASSOCIATES
2HNK. KLEIN, PE
enclosures
cc: Mr. Ed Hill

996 71 j
FINAL DESIGN - NOT RELEASED FOR CONSTRUCTION
STORM DRAINAGE CALCULATIONS
for
NorthChase Auto -Shine
TRADEMARK DRIVE
NorthChase Park of Commerce
New Hanover County, North Carolina
PREPARED FOR
NorthChase Auto -Shine, L.L.C.
807 Wood Cove Road
Wilmington, NC 28409
[phone]
April 1999
FILE NO.: 99001
,���it /p lop#*4
.•`4�t1 GAR0z '•.
�4E�1Qa''y'A •yep
s AL
r
r
141. •
IN
'a ITVIN
PREPARED BY
KLEIN : �NGPIVEERING AND ASSOCIATES
3410 Wrightsville Avenue
Wilmington, NC 28403
[phone]

DESIGN NARRATIVE
1. GENERAL:
The purpose of this submittal is to present design data used for the stormwater management measures for the
site. Included within this submittal are the Drawings and Storm Drainage Calculations. All items are part of
the overall plan and included by reference.
The project involves design of a self-service car wash with one (1) automatic bay and five (5) self-service bays.
The project is located on Trademark Drive within the NorthChase Park of Commerce. As of the application
date, the NCDOT has not taken over ownership of the roadway corridor; however, the NorthChase developer
has made application and transfer of ownership is forthcoming. Under common ownership is the lot adjacent
the project site to the east located along the comer of Trademark Drive and Enterprise Drive; however, no plans
for development have been finalized.
The site is part of a larger drainage collection area which is designed to be treated in the DWQ stormwater pond
directly to the south and constructed as part of the NorthChase Apartments development.
2. EXISTING SITE:
The project site has been heavily disturbed as part of prior activity for the adjoining apartment site. Remaining
vegetation consist of low ground cover sporadically across the site. Drainage is typically to a north and eastward
direction with ultimate discharge into the roadway culvert along Enterprise Drive south of the project site.
3. PROPOSED IMPROVEMENTS:
The proposed improvements consist of the car wash and surrounding paved areas as well as the storm drainage
piping for the site. As part of the drainage system, an assumption that the tract to the east would eventually tie
into the line to Auto -Shrine piping was made. Although the actual tie-in may be down -stream of the site, this
assumption would yield the greatest impact to the hydraulic grade line. Furthermore, estimates of runoff from
the Trademark lots to the west and east were made based on the DWQ built -upon allowance of 80% built -upon.
Roadway culvert design was based on routing the drainage flow from ditch which follows the right-of-way lines
beginning at the church site to the south, running northward to Trademark Drive, then turning east as it passes
the project site. Drainage area is relatively small and consists of minor lawn collection areas along the College
Road right-of-way. The predominant runoff pattern of sites to the south are for collection and discharge into
onsite detention ponds located along Enterprise Drive to the east.

Page Two
Design Narrative
Auto -Shine Car Wash
4. STORM DRAINAGE DESIGN METHODOLOGY:
Storm drainage calculations were aimed at directing all site runoff into the DWQ pond immediately south of
the project site. To achieve this, the original design file for the NorthChase Apartments was amended to include
the proposed collection system. This enabled both design of the new system as well as reviewing the effect of
adding the additional flow had on the existing network. The design tool used to assist this evaluation was the
StormCAD program developed by Haestad Methods, Inc. Results of this evaluation are included in this
submittal.
Additional design was made on the roadway culvert based on the estimated travel time and drainage basin size.
Parameters input into the design as well as any assumptions used are provided in the attached Calculations. To
assist in this review, the software program Hydraflow by Intelisolve was used Detailed results of this evaluation
are included in this submittal.
5. RESULTS
Review of the results indicate that the additional flow into the existing piping network had minimal impact on
the hydraulic grade line. This may be due to the fact that the entry point of the additional flow is at the lowest
junction prior to the pond and impacts a short segment of pipe. Furthermore, the piping at the lower end of the
existing system is larger and the additional flow can be added to the existing flow with minimal impact on the
hydraulic grade.
Culvert design yields favorable results with the culvert hydraulic profile located well below pavement grades.
Surcharge conditions are minimal and resulting velocity is nominal. (See rip -rap calculations included)

DRAINAGE ALCUVATIONS
REVISED PIPING NETWORK
ROADWAY CULVERT DESIGN

Project Title: NorthChase Apartments Project Engineer: Klein Engineering and Associates
d:1..199tiles\99001-hill car wasMeombined strn Klein Engineering and Assoc StormCAD v1.0
0323199 10:40:19 AM 0 Haested Methods, Inc. 37 Brookside Road Waterbury, CT 06708 USA [phone] Page 1 of 1

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KLEIN ENGINEERING AND ASSOCIATES
PROJECT: Auto -Shine Car Wash
CLIENT: NorthChase Auto -Shine, LLC
LOCATION: New Hanover County, NC
SUBJECT: Design of Roadway Culvert
GIVEN:
PROJECT NO.: 99001
DATE: April1999
PREPARED BY: JKK
1. Runoff Coefficients used for Design:
The predominant area consists of grassed areas along the property line. Adjoining
tracts collect all runoff into detention ponds located along Enterprise Drive.
Use: C = 0.30
2. Estimate of Time of Concentration:
using Kirpach Method (City of Wilmington formula)
Longest Travel Length = 2190 LF
Slope of Ditch = 0.11 %
Elevation Change to Culvert = 2.4 VF
T = (L^3/H)^.385 / 128
where: L = 2190 LF
H =change in height = 2.4 FT
Therefore, T = 40 minutes
Use: City of Wilmington Charts
3. Parameter used for Flow Estimate: use Rational Method
Area (A) = 4.44 Acres
C = 0.30
Tc = 40 min
4. Pipe Design: refer to attached caics for piping design
5. Pipe Rip -rap stabilization:
Velocity = 4.0 fps see caics
Dia = 15 -inch
From Figure 8.06.b.1, falls within Zone: 1.
From Figure 8.06.b.2, use:
inlet = 3 x Do = 3.75 LF
outlet = 4 x Do = 5 LF
99001- NorthChase Auto -Shine

CL
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Hydraflow Summary Report
Page 1
Line
•
Line ID
Flow
rate
(cfs)
Line
size
(in)
Line
length
fQ
Invert
EL Dn
(R)
Invert
EL Up
lfQ
Line
slope
N
HGL
down
(Q
HGL
Up
tfQ
Mirror
loss
(M
Dns
line
No.
i
I
L I
Culvert
4.90
I
15 c
136.0
I
I
31.06
3120
0.103
32.31*
33.W
0.25
End
I
Project File: New.STM
I-D-F File: Wiim.IDF
Total No. Lines: 1
Run Date: 04-14-1999
NOTES: c - circular; e = eliptical; b = box; Rehm period = 10 Yrs.; * Indicates surcharge condition.

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FJTIMA71ON OF STONE SIM, AND DIMENSIONS FOR
CUI.VF.RT APROM
Sfcp 1) Com" flow vcbcily Vo at c:ulvM or pavod chawd ou t t.
Step 2) For pipo culmU Ds is dbnr., r.
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7 SPECIAL SY14 OR �RWW ERGY 01S1PATORS� $TILLNGIRSIZE �
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