SW8940120_HISTORICAL FILE_19990125

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 q4olm
DOC TYPE
El CURRENT PERMIT
El APPROVED PLANS
[X HISTORICAL FILE
El COMPLIANCE EVALUATION INSPECTION
DOC DATE
lqljok,��
YYYYMMDD

State of North Carolina
Department of Environment
and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Division of Water Quality
January 25, 1999
Mr. Jerry Porter, Owner
Jerry Porter Lincoln, Mercury, Isuzu
5501 Market Street
Wilmington,NC 28403
A 4 0
IT
4
NCDENR
Nc� CAROLINA DMPA�MEN­r OF
ENVIRONMEN-r AND N�R4L ReSOURCES
Subject: Permit No. SW8 940120 Modification
Jerry Porter Parking Lot Expansion
High Density Stormwater Project
New Hanover County
Dear Mr. Porter:
The Wilmington Regional Office received a modification to the Stormwater Management Permit Application for Jerry Porter
Parking Lot Expansion on September 24, 1998, with final information on November 24, 1998. Staff review of the plans and
specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Title
15ANCAC2H.1000. We are forwarding Permit No. SW8 940120 Modification dated January 25, 1999, for the construction
of Jerry Porter Parking Lot Expansion.
This permit shall be effective from the date of issuance until January 25, 2009, 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 He ' arings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this permit shall
be final and binding.
If you have any questions, or need additional information concerning this matter, please contact Linda Lewis, or me at (910)
395-3900.
Sincerely,
Rick Shiver
Water Quality Regional Supervisor
RSS/arl: S:\WQS\STORMWAT\PERMIT�940120.JAN
cc: Phil Tripp, P.E.
Tony Roberts, New Hanover County Inspections
Beth Easley, New Hanover County Engineering
Linda Lewis
Wilmington Regional Office
Central Files
127 Cardinal Dr. Ext., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/] 0% post -consumer paper

State Stormwater Management Systems
1!eEmit No. SW8 940120 Modification
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
IHGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other
applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
Jerry Porter, Owner
Jerry Porter Lincoln, Mercury, Isuzu Parking Lot Expansion
New Hanover County
FORTHE
construction, operation and maintenance of a detention pond in compliance with the provisions of 15A NCAC 2H . 1000
(hereafter referred to as the "stormwater rules') and the approved stonnwater 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 January 25, 2009 and shall be subject to the following specified
conditions and limitations:
1. DESIGN STANDARDS
This permit is effective only with respect to the nature and volume of stormwater described in the application and
other supporting data.
2. This stormwater system has been approved for the management of stormwater runoff as described on page 3 of this
permit� the Project Data Sheet. The stormwater control has been designed to handle the runoff from 94,360 square
feet of impervious area.
Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the
permit.
4. The tract will be limited to the amount of built -upon area indicated on page 3 of this permit, and per approved plans.

State Stormwater Management Systems
Permit No. SW8 940120 Modification
DIVISION OF WATER QUALITY
PROJECT DESIGN DATA SHEET
Project Name:
Jerry Porter Parking Lot Expansion
Permit Number:
SW8 940120 Modification
Location:
New Hanover County
Applicant:
Mr. Jerry Porter, Owner
Mailing Address:
Jerry Porter Lincoln, Mercury, Isuzu
5501 Market Street
Wilmington,NC 28403
Application Date:
September 24, 1998
Water Body Receiving Stormwater Runoff:
Spring Branch (CF 18-74-63- 1)
Classification of Water Body:
11C Sw"
If Class SA, chloride sampling results:
n/a
Pond Depth, feet:
6.5
Permanent Pool Elevation, FMSL:
36
Total Impervious Surfaces, ft':
94,360
Offsite Area entering Pond, 112:
none, per Engineer
Required Surface Area, ft':
4,749
Provided Surface Area, f12:
4,077
Required Storage Volume, ft':
7,552
Provided Storage Volume, ft3:
8,478
Temporary Storage Elevation, FM[SL:
37.5
Controlling Orifice:
I " + pipe

State Stormwater Management Systems
Permit No. SW8 94012Q Modification
H. SCHEDULE OF COMPLL4,NCE
Tile stormwater management system shall be constructed in it's entirety, vegetated and operational for its intended
use prior to the construction of any built -upon surface except roads.
2. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired
immediately.
3. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater
system functions at optimum efficiency. The approved Operation and Maintenance Plan must be followed in its
entirety and maintenance must occur at the scheduled intervals including, but not limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and revegetation of 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.
9. Access to the outlet structure must be available at all times.
4� Records of maintenance activities must be kept and made available upon request to authorized personnel of DWQ.
The records will indicate the date, activity, name of person performing the work and what actions were taken.
5. Decorative spray fountains will not be allowed in the ponds.
6. The facilities shall be constructed as shown on the approved plans. This permit shall become voidable unless the
facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and
other supporting data.
7. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this
permitted facility, a certification must be received from an appropriate designer for the system installed certifying
that the permitted facility has been installed in accordance with this permit, the approved plans and specifications,
and other supporting documentation. Any deviations from the approved plans and specifications must be noted on
the Certification.
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. Prior to the sale of any portion of the property, an access/maintenance easement to the stormwater facilities shall be
granted in favor of the permittee if access to the stormwater facilities will be restricted by the sale of any portion of
the property.
10. The permittee is responsible for verifying that the proposed built -upon area does not exceed the allowable built -upon
area.
11. The runoff from all built -upon area on the project must be directed into the permitted stormwater control system.
12. 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.
S

State StOrrnwater Management Systems
EeEiiiit No. SW8 94012Q Modification
13. The following items will require a modification to the permit:
a. Any revision to the approved plans, regardless of size.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area.
e. Further subdivision of the project area.
f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan.
In addition, 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.
HL 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 �ermittee, 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.
The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules,
regulations, or ordinances which may be imposed by other government agencies (local, state, and federal) which have
jurisdiction.
4. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the
Permittee shall take immediate corrective action, including those as may be required by this Division, such as the
construction of additional or replacement stormwater management systems.
5. The permittee grants DENR Staff permission to enter the property for the purpose of inspecting all components of
the permitted stormwater management facility.
6. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit
modification, revocation and reissuance or termination does not stay any permit condition.
Perin it issued this the 25th day of January, 1999.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Lal A A A
A. Preston Howard, Jr., P.E., Director
IZ91-1 Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number SW8 940120 Modification

State Stormwater Management Systems
Rermit No. SW8 940120 Modification
Jerry Porter Parking Lot Expansion
Stormwater Perin it No. SW8 940120 Modification
New Hanover County
Engineer's Certification
1, , as a duly registered Professional Engineer in the State of North Carolina,
having been authorized to observe (periodically/weekly/full time) the construction of the 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 specification:
Signature
Registration Number
Date
SEAL
R

State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
Thisform may be photocopiedfor use as an original
1. GENERAL INFORMATION
Applicants name (specify the name of the corporation, individual, etc. who owns the project):
2. Print Owner/Signing Official's name and title (the person who is legally responsible for the facility and
its compliance):
Jera Port r, Owner
3. Mailing Address for person listed in item 2 above:
City: State: NC Zip: 28403
Tcicphone Number: [phone]
4. Project Name (subdivision, facility, or establishment name — should be consistent. with project name on
plans, specifications, letters, operation and maintenance agreements, etc.):
Jerry Porter Lincoln, Mercury, Isuzu Parking Expansion
5. Location of Facility (street address):
5501 Market St.
City: Wilmington County: New Hanover —
6. Directions to facility (from nearest major intersection):
approx. 500 If East from the intersection of U.S./ HM 17 and NC HyW 132
7. Latitude :
Longitude:
Contact person who can answer questions about the facility:
Name: Tripp Engineering, P.0 — Telephone Number:
11. PERMIT INFORMATION:
of facility
Specify whether project is (check one): — New Renewal X— Modification
If this application is being submitted as the result of a renewal or modification to an existing permit, list
The existing permit number SW8 940120 and its issue date (if known)
Form SWU-101 January 1998 Page I of 4

Specify the type of project (check one):
—LowDensity __X_HighDensity _Redevelop _GeneralPermit Other
4. Additional Project Requirements (check applicable blanks):
CAMA Major X Sedimentation/Erosion Control 404 Pennit
Ill. PROJECT INFORMATION
1. Ill tile space provided below, summarize how stormwater will be treated. Also attach a det0ed
narrative (one to two pages) describing stormwater management for the project.
Stormwater detention pond
2. Stormwater runoff from this project drains to the Carie Fear River basin.
3. Total Project Area: 2.62 — acres 4. Project Built Upon Area: 83
5. How many drainage basins does the project have? 1
6. Complete the following information for each drainage basin. If there are more than two drainage basins
in the project, attach an additional sheet with the information for each basin provided in the same format
as below.
�B�Ji&lhfdi aticinq"N—
, a' ft'�ffi
ama g
Receiving Stream Name
Smith Creek
Receiving Stream Class
C SW
Drainage Basin Area
114,127 sf
Existing Impervious * Area
83,832 sf
Proposed Impervious * Area
10,528 sf
% Impervious* Area (total)
83%
On -site Buildings
N/A
On -site Streets
N/A
On -site Parking
10,528 sf
On -site Sidewalks
N/A
Other on -site existing
83,832 sf
Off -site
N/A
Total:
, E=94,360 sf
J:=
* Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking
areas sidewalks, gravel areas, etc.
How was the off -site impervious area listed above derived?
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
Deed restrictions and protective covenants are required to be recorded for all low density projects and all
subdivisions prior to the sale of any lot. Please see Attachment A for the specific items that must be recorded.
Form SWU-101 January 1998 Page 2 of 4

By your signature below, you certify that the recorded deed restrictions and protective covenants for this project
shall include all die items required by the permit, 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. AGENT AUTHORIZATION
If you wish to designate submittal authority to another individual or firm so that they may provide information
on your behalf, please complete this section:
Designated agent (individual or firm): Tripp Engineering, P.C.
Mailing Address: 507 Chestnut Street
City: State: NC Zip: 28401
Phone: [phone] Fax: [phone]
V11. SUBMITTAL REQUIREMENTS
This application package will not be accepted by the Division of Water Quality unless all of the applicable
items are included with the submittal.
I Please indicate that you have provided the following required information by signing your initials in the
space provided next to each item.
• Original and one copy of the Stormwater Management Permit Application Form Ap i LiVs Initiahs
• One copy of the applicable Supplement Form(s) for each BMP (see Attachment A)
• Permit application processing fee (see Attachment A)
• 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 and date
- Mean high water line
- Dimensioned property/project boundary
- Location map with named streets or NCSR numbers
- Original contours, proposed contours, spot elevations
- Details of roads, parking, cul-de-sacs, sidewalks, and curb and gutter
- Wetlands delineated, or a note on plans that none exist
- Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations
- Drainage basins delineated
- Vegetated buffers (where required)
V1. APPLICANT'S CERTIFICATION
1, (print or type name ofperson listed in General Information, item 2) Jer -v Porter , certify
that the information included on this permit application form is correct, that the project will be constructed in
conformance with the approved plans, that the deed restrictions in accordance with Attachment A of this form
will be recorded with all required permit conditions, and that to the best of my knowledge, the proposed project
complies with the requirements of 15A NCAC 2H , 1000.
Signature:
Title:
Form SWU-101 January 1998
Page 3 of 4
Date:

ATTACHMENT A
1. Deed Restriction Language
The following statement must be recorded for all low density projects and for all projects that involve the
subdivision and selling of lots or outparcels:
Nomorethan—NIA square feet of any lot, including that portion of the right-of-way between the
edge ofpavement and thefront lot line, shall be covered by impervious structures including asphalt,
gravel, concrete, brick, stone, slate or similar material but not including wood decking or the
surface ofswimming pools. This covenant is intended to insure continued compliance with the
stormwater permit issued by the State ofNorth Carolina The covenant may not be changed or
deleted without the consent of the State.
2. No one mayfill in, pipe, or alter any roadside swale except as necessary to provide a minimum
driveway crossing.
NOTE: If lot sizes vary significantly, the owner/developer must provide an attachment listing each lot
number, size and the allowable built upon area for each lot.
For commercial projects that have outparcels or future development, the following statements must also be
recorded:
3. The connectionftom the outparcel orfuture area into the stormwater system must be made into the
forebay such that short-circuiting of thesystem does not occur.
4. All buill-upon areafrom the oulparcel orfuture development must be directed into the permitted
stormwater control system.
5. Built -upon area in excess of the permitted amount will require a permit modification prior to
construction.
For curb outlet systems, the following statement in addition to items I and 2 above must be recorded:
6. No one may pipe, fill in or alter any designated I 00foot long grassed swale used to meet the
requirements ofNCAC 211. 1008(g).
2. Supplement Forms
The applicable supplement form(s) listed below must be submitted for each BMP specified for this project:
Form SWU- 102
Wet Detention Basin Supplement
Form SWU- 103
Infiltration Basin Supplement
Form SWU- 104
Low Density Supplement
Form SWU-105
Curb Outlet System Supplement
Form SWU- 106
Off -Site System Supplement
Form SWU- 107
Underground Infiltration Trench Supplement
Form SWU-108
Neuse R�iver Basin Nutrient Management Strategy Supplement
3. Permit Application Fees (check made payable to NCDENR and submitted to the appropriate
Regional Office)
Type of Permit
Low Density
High Density
Other
Director's Certification
General Permit
New, Modification, or
Late Renewal
$225
$385
$225
$350
$ 50
Form S \VU - 10 1 January 1998 Page 4 of 4
Timely Renewal Without
Modification
n/a
$225
n/a
n/a
n/a

Permit No. _5U)9'?4-0i20 it,(013
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
Thisform may be photocopiedfor use as an original
DWQ Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a wet detention basin supplement for each basin,
design calculations, plans and specifications showing all basin and outlet structure details, and a signed and
notarized operation and maintenance agreement.
1. PROJECT INFORMATION (please complete the following information):
Project Name: Jerry Porter Lincoln, Mercury, Isuzu Parking Expansion
Contact Person: Phillip G. Tripp PhoneNumber: [phone]
For projects with multiple basins, specify which basin this workshect applies to:
Basin Bottom Elevation (-2. 9�5) N. 5
Permanent Pool Elevation �.o ft.
Temporary Pool Elevation 37.50 ft.
Permanent Pool Surface Area 4,977 sq.ft
Drainage Area
2.62
sq,ft.
Impervious Area
2.166
ac.
Permanent Pool Volume
16,175
cu. ft.
Temporary Pool Volume
8,478
cu.11.
Forebay Volume
N/A
cu.11.
SAIDA I used 0.0424
Diameter of Orifice 1.0 in.
Design TSS Removal go %
H. REQUIRED ITEMS CHECKLIST
(average elevation of the floor of the basin)
(elevation of the orifice)
(elevation of the discharge structure overflow)
(water surface area at the orifice elevation)
(on -site and off -site drainage to the basin)
(on -site and off -site drainage to the basin)
(combined volume of main basin and forebay)
(volume detained above the permanent pool)
(surface area to drainage area ratio)
(85% TSS removal required, see item k below)
The following checklist outlines design requirements per the Stormwater Best Management Practices manual
(N.C. Department of Environment, Health and Natural Resources, November 1995) and Administrative Code
Section: 15 A NCAC 2H . 1008.
Initial in the space provided to indicate the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below. If a requirement has not been met, attachJustification.
Forin S\VU-102 Rev I/August 1998 Page I of 3

-A7pplitants Initials
C L2C, a.
The temporary pool controls runoff from the I inch storm event.
t4_,& b.
The basin length to width ratio is greater than 3: 1.
c.
The basin side slopes above the permanent pool are no steeper than 3: 1.
d.
A submerged and vegetated perimeter shelf at less than 6:1 is provided (show detail).
e.
Vegetation above the permanent pool elevation is specified.
�JA f.
An emergency drain is provided to empty the basin.
g.
The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet),
h.
The temporary pool draws down in 2 to 5 days.
CCX- i.
A trash rack is provided for both the overflow and orifice.
NA j.
The forebay volume is approximately equal to 20% of the total basin volume.
C� k.
Sediment storage is provided in the permanent pool.
NJ,&
1.
A 30-foot vegetative filter is provided at the outlet2 (include erosive flow calculations).
A m.
Recorded drainage easement for each basin including access to nearest right-of-way.
Coe,, n.
A site specific operation and maintenance (0 & M) plan is provided.
J "2a o.
A vegetation managementhnowing schedule is provided in the 0 & M plan.
(22 p.
Semi-annual inspections are specified in the 0 & M plan.
C: QC q.
A debris check to be performed after every storm event is specified in the 0 & M plan.
cc�_ r.
Specific clean -out benchmarks are specified in the 0 & M plan (elevation or depth).
Ca s.
A legally responsible party is designated in the 0 & M plan3 (include name and title).
CG_r, t.
If the basin is used for sediment and erosion control during construction, clean out of the
basin is specified to be performed prior to use as a wet detention basin.
Footnotes:
I When using the Division SAIDA tables, the correct SAIDA ratio for pennanent pool sizing should be computed based upon the
actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for non-
standard table entries.
2 The requirement for a vegetative filter may be waived if the wet detention basin is designed to meet 90% TSS removal.
3 The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a
resident of the subdivision has been named the president.
Ill. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
The wet detention system is defined as the wet detention basin, forebay, non-integrated pretreatment
Systems (pretreatment other than forebays), and the vegetated filter if one is provided.
This system (check one) 0 does ddoes not incorporate a vegetated filter.
This system (check one) 0 does Pr'd&es not incorporate non-integrated pretreatment.
Maintenance activities shall be performed as follows:
I . After every significant runoff producing rainfall event and at least monthly:
Forni SWU-102 Rev I/August 1998 Page 2 of 3

a. Inspect the wet detention system for sediment accumulation, erosion, trash accumulation, grass
cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days.
2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative
Cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain
proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
reduced to 75% of the original design depth. Removed sediment shall be disposed of in an appropriate
manner and shall not be handled in a manner that will adversely impact water quality (i.e. stockpiling near a
wet detention basin or stream, etc.)
The original design depth is: 6.501
The sediment removal benchmark depth is: 4.881
5. Remove cattails and other indigenous wetland plants when they cover 75% of the basin surface. These
plants shall be encouraged top grow along the basin perimeter.
6. if the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through
the emergency drain shall be minimized to the maximum extent possible.
7. All components of the wet detention basin system shall be maintained in good working order.
I acknowledge and agree by my signature below that I am responsible for the performance of the above
maintenance procedures. I agree to notify DWQ of any problems with the system or changes in the name of the
project, responsible party, or address.
Print name: Jerry Porter
Addr(
Phon(
Title:
Signa
Date:
L'�_ C,, a Notary Public for the State of
County of do hereby certify that L,_� -
personally appeared before me this d-7 day_of /f/c/,L) 19 �10 and acknowledge the
due execution of the forgoing infiltratiopy6e, di , menance requirements. Witness my hand and official seal,
SEAL
M I is expires
ForinSWU-102 Revl/AtigustI998 Page 3 of 3

State of North Carolina
Department of Environment
and Natural Resources
'Wilmington Regional Office
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Division of Water Quality
November 14, 1998
Mr. Phil Tripp, P.E.
Tripp Engineering
507 Chestnut Street
Wilmington, NC 28401
ffTQ8?WFJ
Tor
nz� A ;
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NArURAL REsounces
Subject: ACKNOWLEDGEMENT OF RECEIPT AND
REQUEST FOR ADDITIONAL INFORMATION
Storrawater Project No. SW8 940120 Modification
Jerry Porter Lincoln Mercury Expansion
New Hanover County
Dear Mr. Tripp:
The Wilmington Regional Office received a modification to the Stormwater Management Permit
Application for Jerry Porter Lincoln Mercury Expansion on September 24, 1998. A preliminary review of
that information has determined that, the application is not complete. The following information is needed
to continue the stormwater review:
I The calculations indicate a depth of 6' below normal pool, and the pond details show the
bottom elevation at 30, but the supplement form indicates a new bottom at 29.5. Please revise
the details and calculations to indicate a 6.5' depth.
2. Since the revised plans submitted will replace those currently permitted, please place all
dimensions for the asphalt and gravel parking areas and the permanent pool on the plans.
3. Please sign a new Operation and Maintenance Plan with the new benchmark cleanout
elevations noted.
4. Delineate all wetlands on site, or note on the plans that none exist.
5. Please provide the Engineer's Certification for the pond.
127 Cardinal Dr. Ext., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An Equal opportunity Affirmative Action Employer 50% recycled/10% post -consumer paper

Mr. Tripp
November 14, 1998
Stormwater Project No. SW8 940120 Modification
Please note that this request for additional information is in response to a preliminary review. The
requested information should be received by this Office prior to December 14, 1998, or the application will
be returned as incomplete. The return of a project will necessitate resubnuttal of all required items, including
the application fee. The Division is allowed 90 days from the receipt of a completed application to issue the
permit.
If you have any questions concerning this matter please feel free to call me at [phone].
Sincerely,
Ms. Linda Lewis
Environmental Engineer
RSS/arl: S: \WQS\STORMWAT\ADDINFO\940120. NOV bs'
cc: Linda Lewis
Jerry Porter
Central Files

TRIPP ENGINEERING, P.C*
507 Chestnut Street
Wilmington, North Carolina 28401
Phone: [phone] Fax: [phone]
November 23, 1998
NCDENR
Division of Environmental Management
Water Quality Section
127 Cardinal Drive
Wilmington, NC 28405-3845
Attn: Ms. Linda Lewis
Ile: Jerry Porter Lincoln, Mercury Isuzu Parking Expansion
SW8 940120 Modification
New Hanover County, NC
TE 98065
Dear Linda:
NOV 2 4 19%
In response to your correspondence dated November 14, 1998, we offer the
following:
I , Calculations and detail have been adjusted to correlate with plan.
2. Dimensioning for existing areas has been provided.
3. A new 0 & M with clean out benchmarks has been provided.
4. No wetlands are located on this site.
5. An engineering certification has been provided.
Please review for approval and contact us with questions or comments, or if you
require additional information. Thank you.
Sincerely,
Tripp Engineering, P.C.
Charles D. Cazier, E.I.
CDC:jss
Enc.

11/18198
CDC
Total rainageArea
sq. ft. acres
114,127 1 2.62
Impervious Ar
Land Use
sq,ft.
acres
buildings
0
0.00
parking/asphak and stone
94,360
2.17
concrete
0
C.C�A
2.1'7
Slormwater Calculations;
Time of Concentration
Hydraulic Length (L) = 748 ft.
change in Height (H) =
Tc (L' /H) ' / 128
1 10.68 min.
Flow for 2 year, 6 hour Storm (00
OPRE PPRE) X (110) X (Area)
3.31 cf
Q�ow (Cposr) x 01�
11.00 ct
Soil Storage Capacity for 2 year Ste":
CN (98)(% imp.) + (60)(1-% imp
92
P 3.30 in. for2yr, 6 hr storm
S- I 0001CN - 10
0.87
Depth (D)= jP-(0.2)(S)]2j [p+(o 8)(S)]
2.45 in.
Time to Peak Flm
Tp : [(43.255)(+D)(Area
1 33 min Q2 POS
Detention Pond Design:
P�.d Al'..
Elevation
SurfMace Are
(sq. ft+)
Normal Pool
36.DO
4,977
Flood Pool
37.50
6,327
Top of Bank
38.00
6,775
Bottom of Pool
29.50
0
Provided Storage Volume:
Vol. [(Normal pool SA + Flood Pool SA) / 21
x (F.P. elov. - N.P� olov.)
1 8,478 cu. ft.
JERRY PORTER
POND ADDITIONS
Stormwater Calculations
% impervious = 0.827
= 82.7%
ay 1
CPRE o 0.25
C�- I% imp.)(.95)+(I-% imp.)(.25)
0.83
1, = 5.06 in/hr
Ila - 6.30 n1hr
Flowfor 10year, 6 hour Storm (010)
OPRE (CPRE) X (125) x (Area)
4.13 cfs
OPOST (CPOST) X (125)
13.70 cfs
CN (98)(% imp.) + (60)(1 -% imp.)
92
P 4.82 in. for 10 yr, 6 hr storm
S 1000/CN - 10
0.87
Depth (D)= [P-(0-2)(S)121 jp�(o 8)(S)]
� 3.91 in.
Time to Peak Flow:
T 1(43.5)(D)(Area)] I Q10 po,,
I : 32.56 min.
State Surface Area Requirement at normal pool:
Pond side slopes = 3 :1
Depth belm N.P. = 6+5 ft.
SAJDA = 0.0424
(Chart for 90% TSS Removal for Wet Detention
Pond without Vegetative Filter)
Required SA (SAJDA) x (Taal Dminage Area)
4,839 sq. ft.
State Volume Required for Stomao of first l' of runoff
Vol.= [(1/12)x(DA)x(%inrp.)j+
((1/12)x(DA)x(l-%imp.)xC]
C - 0.2
8.193 cu+ ft.
98065
� IN wp I I
E C E I V E
NOV 2 4 1998
PROJ If AMjzamon
98065POND.xis 1 of 2

11/18/98 JERRY PORTER
CDC POND ADDITIONS
Stormwater Calculations
Pond Volume:
Norm'"o A 97.300 sq. ft.
.01P.mol :A 4,977 sq. ft.
Vol. = [(N.P. SA + Bottom SP.) 121 x (N.P. el. - Bottom a[.)
= 332,400 cu. ft.
Forebay;
Required Volume
1 Vol. 2096 of storage volume
66,480 cu. ft.
-Pond was designed before forebays were required.
Ourtlet Structure Design:
Flovv for 2-day drawdown:
for Ist 1* of stormwater,
0 Provided Vol. / 172,800 sec. (2-days)
0.049 cfs
Required Area of Pipe for 2-day drowdov;n:
A- 0/[CdxSQRT(2xgxh))
Coll 0.6
9 a2.2 11.1s 2
h (F.P. elev, N.P. elov.) 12
0.75 ft.
A 0:0118 sq. ft.
Diameter of Pipe for 2-day drawdown:
DIA. SORT((A x 4)1 pi]
0.1224 ft.
1.47 in.
Outlet Structure Check�
Usmg a 6 x 6' Basin,
Perimeter (L) = 24 ft.
0 CIA
C (96 imp)(.95) + (1 -% imp.)(.25)
0.113
1 6.30 in. for a 25 yr. Storm
A 2.62 Acres
13.70 eta
0 = Cw x L x H' 5
H = [Q / (Cw x Qj�
Cw- 3
0.33 ft.
Peak elevation flood pool elevation + H
37.83 ft.
Provided Volume
Bottom SA =
0 sq. ft,
Normal Pool SA =
0 sq. ft.
Vol. -
[(N.P. SA + Bottom SA) / 21 x (N.P. el. - Bottom el.)
0 cu. ft.
depth
0 ft.
Fim for 5-day drawdmn:
for Ist I" of stormwater,
Q Provided Vol. / 432,000 sec. (5-days)
0.020 eta
Required Area of Pipe for 5-day drawdown:
A 0 / [Cal x SORT(2 x g x h)]
Cd - 0.6
9. 32+2 Us 2
h - (F.P. elov. - N.P. elev.) / 2
0.75 ft.
A 0.0047 sq. ft.
Diameter of Pipe for 5-day drawdown
Olk SORT[(A x 4) 1 pi]
0,0774 ft.
1 0.93 in.
98065
98065POND.xls 2 of 2

11/18t9a
CDC
JERRY PORTER- 10 Year Storm Pipe Calculations
98065
LOCATION
AREA
RUNOFF
COEFF.
C
RAIN
INT.
I
(In1hr)
FLOW
PIPE DATA
FROM
TO
SUB
TOTAL
(Acr
TOTAL
(Acre)
Q-CIA
(C.F-S.
REO'D)
TYPE
LENGTH
In)
S%
SIZE
in
VEL.
(FULL)
(fps)
0
AVAIL.
(cft)
HI
INV.
LOW
INV.
ELEV.
HEAD
(ft)
kN
h12
Drop Inlet #1
SDMH 91
0.34
0.84
6.30
1.79
RCP
0.012
80
0.31%
12
2.3
2.16
35.50
35.25
0.25
SOMH 01
SDMH#2
0.34
0.84
6.30
1.79
RCP
0.012
30
0.33%
A 12
A 2
2.3
2.23
35.25
35.15
0.10
SDMH#2
FES
0.34
0.84
6.30
1.79
RCP
0.012
20
0.25%
2.3
1.94
35.15
35.10
0.05

0 TRipp ENGINEERING, P.C.
507 Chestnut Street
Wilmington, North Carolina 28401
Phone: [phone] - Fax: [phone]
September 23, 1998 SEP 2 4 1998
NCDENR
Division of Environmental Management
Water Quality Section
127 Cardinal Drive
Wilmington, NC 28405-3845
Attn: Ms. Linda Lewis
Re: Jerry Porter Lincoln, Mercury, Isuzu Parking Expansion
New Hanover County, NC
SW8 940120
TE No. 98065
Dear Linda:
S�o-g(�q�-)jzo
Enclosed please find two (2) sets of plans, one (1) signed original and one (1)
copy of the application form, two (2) sets of sealed calculations, and one (1) check to
cover the application fee. We are applying for a modification to an existing permit as
referenced above.
you.
M
Please review for approval and contact us with any questions or comments. Thank
Sincerely,
T.* p En P C
gi
A . I; :* '
Phillip G. Tripp, P.E.
PG,r.iss
Enc.