SW8920913_HISTORICAL FILE_20120501

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 012 O 9 13
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
fig HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
20120,501
YYYYMMDD

RCDETR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Charles Wakild, P E
Governor Director
May 1, 2012
Robert King, President
Bob King Buick-GMC, Inc
Post Office Box 3067
Wilmington, NC 28406
Subject. Approved Plan Revision
Bob King Mercedes Expansion
Stormwater Project No SW8 920913
New Hanover County
Dear Mr King
Dee Freeman
Secretary
On April 9, 2012, the Wilmington Regional Office received a plan revision for Stormwater
Management Permit Number SW8 920913 The revisions include the removal of parking area
to accommodate the new building expansion resulting in a net decrease of 50 square feet of
impervious surface It has been determined that a formal permit modification is not required for
the proposed changes We are forwarding you an approved copy of the revised plans for your
files Please replace the old approved plan sheets with the new ones
Please be aware that all terms and conditions of the permit renewed on March 2, 2011,
remain in full force and effect Please also understand that the approval of this revision to the
approved plans for the subject State Stormwater Permit is done on a case -by -case basis
Any other changes to this project must be submitted to and approved through the Division of
Water Quality prior to construction The issuance of this plan revision does not preclude the
permittee from complying with all other applicable statutes, rules, regulations or ordinances
which may have jurisdiction over the proposed activity, and obtaining a permit or approval
prior to construction
If you have any questions concerning this matter, please do not hesitate to call me at (910) 796-
7215
Sincerely,
3
Chris Baker
Environmental Engineer II
GDS\csb S \WQS\StormWater\Permits & Projects\1992\2012 05 permitter 920913
cc John Tunstall, P E , Norris & Tunstall Consulting Engineers, P C
New Hanover County Building Inspections
Wilmington Regional Office
Wilmington Regional Office
127 Cardinal Dme Extension, Wilmington North Carolina 28405
Phone [phone] FAX [phone]
Internet w ncwaternuality org
An Finial nnnnrtiimiv 1 ARrmahvp AMinn Fmninvpr
NorthCarohna
Nawra!!y

DWQ USE ONLY
Date Received
Fee Paid (express only)
Permit Number
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT PLAN REVISION APPLIC OFVE
This form may be photocopied for use as an original
I GENERAL INFORMATION APR 0 9 2011
1 Stormwater Management Permit Number SW8 920913 8y --
2 Project Name Bob King Mercedes Expansion
3 Permit Holder's name (speedy the name of the corporation, individual, etc)
4 Print Owner/Signing Official's name and title (person legally responsible for permit)
Robert S King, President
5 Mailing Address for person listed in item 2 above
City Wilmington State NC Zip 28406
Phone (910 ) 793-2464 Fax [phone]
Email bking@bobkmg com cc richardt@bobking com
II PLAN REVISION INFORMATION
1 Summarize the pla� revision pr�posed (attach additional pages if
c- ._ _ . -
III 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 DWQ Office that issued the permit
1 Please indicate that you have provided the following required information by initialing in the space provided
next to each item
Initials
• Original £d 1 copy of the Plan Revision Application Form
• Two (2) copies of revised plans (must be revisions of original approved plan sheet(s))
If applyingin Express review (omit available 20 coastal counties) Application
t , I
• Application fee of $500 00 (mode payable to NCDENR)
VI APPLICANT'S CERTIFICATION
I, (print or hype name of person listed in General Information, item 3) Robert S King, Press dent
certify that 1 have authorized these plan revisions and that the information included on this plan revision
application is, to the st of my kn Ie correct and complete q
Signature Date O d I
Plan Revision Form Rev 13Ju1y2010 (/ Page 1 of I

Date
Project None
Project No—,.--' 1�y� County
The Wilmington Regional Office of the Division of Waty��yaht�recerved
Your Stormwater Permit Plan Revision request on M, �Q—
YourProject will be reviewed within 75 days of receipt 6 you will be notified
if additional information is needed
If you have any questions, please contact any member of the Stormwater
review staff in the Wilmington Regional Office at [phone]
Jo Casmer
Administrative Assistant

CaWleteness Review Checklist
Project Name i�C7 Nk2C[--x_-' Received Date q ( Z
Project Location IU1{ Accepted Date sN
Rule(s) 1:12008 Coastal F-11995 Coastal Phase 11 (WIRO) Universal [E1988 Coastal�t'�'p
Type of Permit New or Mod r PR Existing Permit # (Mod P) gaoq 1'Z, nPE Cert on File?
Density HD or LD Type Commercial or Residential �NCG
. . . 0(%OK?) Stream Class MSA Map [—]Offsite to SW8
Subdivided') Subdivision or Single Lot JMORWMap nExempt
Paperwork Emailed Engineer on
7Supplement(s) (1 original per BMP) BMP Type(s)
70&M with correct/original signatures (1 original per BMP except LS/VFS and swoles)
on with correct/original signatures
or LLC Sig Auth per SoS or letter Note to Reviewer:
(within 6mo)
Soils Report with SHWT
Calculations (signed/sealed)
ElNoobvious errors
)Density includes common areas, etc
Deed Restrictions, if subdivided
& Notarized
Plans
F-12 Sets
Details (roads, cul-de-sacs, curbs, sidewalks, BMPs, Buildings, etc)
Grading
Wetlands Delineated
or No Wetlands
MVicmity Map
Layout (proposed BUA dimensions)
Legend
�DA Maps
Project Boundaries
Infiltration
Wet Pond
Offsite
Soils Report
Soils Report
MPE Cert for Master Lot #
SHWT
El Deed Rest for Master FlLot # Matches Master
Bottom
�SHWT
PP
BUA Permitted (Master) sf
Visited
BUA Proposed (Offsite) sf
Additional Information
Permitted
Proposed
Pr000sed Pr000sed
BUA (sf)
DA (sf)
PP (el)
SHWT (el)
Depth (ft)
SA (sf)

1127 Floral Parkway
Suite 400
Wilmington, NC 28403
[phone]
[phone] Fax
John S Tunstall, PE
April 9, 2012
Norris & Tunstall
Consulting Engineers, P.C.
Ms Jo Casmer
NC DENR / Division of Water Quality
Water Quality Section
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
Re State Stormwater Permit Revision Submittal
Revision to State Stormwater Permit No SW8 920913
Bob King Mercedes Expansion
5115 New Centre Drive
Wilmington, NC
N&T Project No 11104
Dear Ms Casmer
1429 Ash -Little River Road
Ash, NC 28420
[phone]
[phone] Fax
J Phillip Norris, PE
WC",O
Enclosed are two (2) sets of revised plans for the above referenced project, one (1) copy of the
Stormwater Narrative and the original Division of Water Quality Stormwater Management Permit
Revision application for your review and approval
On June 20, 2008, we submitted a plan revision for the Bob King Mercedes Expansion and
received approval from NC DENR on June 20, 2008 The project did not move forward at that
time Please void the previous approval that stated the impervious area was reduced by 20 SF
We have revised the project and are resubmitting for a plan revision
This project consists of removing parking lot area to make room for the building expansion This
site was previously permitted under State Stormwater Permit No SW8 920913 on November 1,
2005 and a State Stormwater Plan Revision was issued on June 20, 2008 No impervious area is
being added as part of this plan In fact, the impervious area is decreasing by approximately 50
square feet
Please feel free to contact us with any questions or comments you may have Thank you for your
assistance on this project
Sincerely,
NORRIS & TUNSTALL
CONSULTING ENGINEERS, P C
S'la"aa�Joh S Tunstall, PE
JST/asn 11104 04-09-12-s-sw-revision-Itr
cc Richard Trask / Bob King Mercedes
1 APR 9 8 Roil
E
By
NCBELS License C-3641

N
STORMWATER SYSTEM & EROSION CONTROL NARRATIVE
BOB KING MERCEDES EXPANSION
5115 New Centre Drive
Wilmington, North Carolina
For
Bob King Buick-GMC, Inc
P O Box 3067
Wilmington, NC 28406
[phone]
Fe a 'Syp
n ` >-Z
C�7
P '/VEER
April 2012
Prepared by
ECEOVE
APR 0 9 2012
BY
NORRIS & TUNSTALL CONSULTING ENGINEERS, P C.
1127 Floral Parkway, Suite 400
Wilmington, North Carolina 28403
[phone]
[phone] (Fax)
License # C-3641
N&T Project No

NARRATIVE
DESCRIPTION
The original project was previously approved under State Stormwater Permit No
SW8 920913 on June 20, 2008 The project did not move forward at that time The
project has been slightly revised as shown on the revised plans The site is a 2 021
acre tract located at 5115 New Centre Drive in Wilmington, NC The soils of the site
consist of silty sands with grades from 0% to 5% Approximately 0 29 acres will be
graded to allow construction of the Bob King Mercedes Expansion project with paved
parking and paved access The budding expansion is located over existing impervious
area The building expansion decreases the impervious area onsite by 50 square feet
The runoff from the site is estimated using the rational method 10-year design storm
and rainfall data for the area Construction is scheduled to begin as soon as all permits
and approvals are obtained
EROSION CONTROL MEASURES
The attached plans and specifications outline the requirements for erosion
control measures Silt fencing will be provided where stormwater would be expected to
sheet flow from disturbed areas directly to adjacent property Gravel check dams will
not be provided unless the Contractor has to temporarily discharge into an open ditch
instead of the proposed storm drain outfall Silt barriers are called for where runoff will
leave the site in swales Maintenance will be provided by the grading contractor
STORMWATER MANAGEMENT MEASURES
The project site is located in New Hanover County Land disturbing on the site
will exceed one acre, which requires the site to comply with both City and State
Regulations The stormwater runoff from the development will be directed to the
existing stormwater detention pond
CONSTRUCTION SEQUENCE
The Contractor will install the silt fence prior to beginning any clearing and
grading operations Additional silt fence will be installed when and if conditions warrant
during construction The silt basins will be constructed immediately after that portion of
the site is cleared, and outlet structure with protection will be installed Disturbed areas
will be landscaped or seeded upon completion

EROSION CONTROL NOTES AND MAINTENANCE PLAN
1 All erosion and sediment control measures will be checked for stability and
operation following every runoff -producing rainfall, but in no case, less than once
every week and within 24 hours of every half -inch rainfall
2 All points of egress will have construction entrances that will be periodically top -
dressed with an additional 2 inches of #4 stone to maintain proper depth They
will be maintained in a condition to prevent mud or sediment from leaving the
site Immediately remove objectionable material spilled washed or tracked onto
the construction entrance or roadways
3 Sediment will be removed from hardware cloth and gravel inlet protection, block
and gravel inlet protection, rock doughnut inlet protection and rock pipe inlet
protection when the designed storage capacity has been half filled with sediment
Rock will be cleaned or replaced when the sediment pool no longer drains as
designed Debris will be removed from the rock and hardware cloth to allow
proper drainage Silt sacks will be emptied once a week and after every rain
event Sediment will be removed from around beaver dams, dandy sacks and
socks once a week and after every ram event
4 Diversion ditches will be cleaned out immediately to remove sediment or
obstructions from the flow area The diversion ridges will also be repaired
Swales must be temporarily stabilized within 21 calendar days of cease of any
phase of activity associated with a swale
5 Sediment will be removed from behind the sediment fence when it becomes half
filled The sediment fence will be repaired as necessary to maintain a barrier
Stakes must be steel Stake spacing will be 6 feet max with the use of extra
strength fabric, without wire backing Stake spacing will be 8 feet max when
standard strength fabric and wire backing are used If rock filters are designed at
low points in the sediment fence, the rock will be repaired or replaced if it
becomes half -full of sediment, no longer drains as designed or is damaged
6 Sediment will be removed from sediment traps when the designed storage
capacity has been half filled with sediment The rock will be cleaned or replaced
when the sediment pool no longer drains or when the rock is dislodged Baffles
will be repaired or replaced if they collapse, tear, decompose or become
ineffective They will be replaced promptly Sediment will be removed when
deposits reach half the height of the 15t baffle Floating skimmers will be
inspected and kept clean weekly
7 Sediment will be removed from the sediment basin when the design storage
capacity has been half filled with sediment Rock will be cleaned or replaced
when the sediment pool no longer drams or if the rock is dislodged Baffles will
be repaired or replaced if they collapse, tear, decompose or become ineffective
They will be replaced promptly Sediment will be removed from baffles when

deposits reach half the height of the 1st baffle Floating skimmers will be
inspected weekly and will be kept clean
Land Quality Requires
8 All seeded areas will be fertilized, reseeded as necessary and mulched
according to specifications in the vegetative plan to maintain a vigorous, dense
vegetative cover All slopes will be stabilized within 21 calendar days All other
areas will be stabilized within 15 working days
Water Quality Requires
9 All seeded areas will be fertilized, reseeded as necessary and mulched
according to specifications in the vegetative plan to maintain a vigorous, dense
vegetative cover All perimeter dikes, swales, ditches, perimeter slopes, all
slopes steeper than 3' horizontal to 1' vertical (3 1) and all high quality water
(HQW) zones shall be provided temporary or permanent stabilization with ground
cover as soon as practicable but in any event within seven (7) calendar days
from the last land -disturbing activity All other disturbed areas shall be provided
temporary or permanent stabilization with ground cover as soon as practicable
but in any event within fourteen (14) calendar days from the last land -disturbing
activity
10 Flocculants will be used to address turbidity issues The pumps, tanks, hoses
and inject systems will be checked for problems or turbid discharges daily
11 Refer to new NPDES rules regarding basin outlet structures and skimmers shall
withdraw water from the surface

SECTION 02920
SOIL EROSION AND SEDIMENTATION CONTROL
1 GENERAL
1 1 Contractor shall take every reasonable precaution throughout construction to
prevent the erosion of soil and the sedimentation of streams, lakes, reservoirs,
other water impoundments, ground surfaces, or other property as required by State
and Local regulations
12 The Contractor shall install all required silt fences, and construction entrances at
the initiation of work, and have these measures reviewed and approved by the local
permit authority prior to clearing and grading operations
1 3 The Contractor shall, within 21 days of suspension or completion of land disturbing
activities, provide permanent protective covering for disturbed areas Temporary
and permanent erosion control measures shall be coordinated to assure
economical, effective, and continuous erosion and siltation control throughout the
construction and post -construction period Use the specified seed for both
temporary and permanent seeding
2 PRODUCTS
21 Asphalt for anchoring mulch shall be Type SS-1 Emulsion
22 Fertilizer shall be 10-10-10 grade or equivalent
23 Lime shall be dolomitic agricultural ground limestone containing not less than 10
percent magnesium oxide
24 Mulch shall be small grain straw, hay, wood chips, asphalt emulsion, jute or other
suitable material free of undesirable weed seed
25 Phosphate shall be 20 percent superphosphate or equivalent
26 Seed shall be 20% carpet grass, 24% Bermuda, 20% turf Fescue, 10% Creeping
Red Fescue, and 24% Annual Rye grain Bermuda seed shall be hulled for warm
weather planting and unhulled for cool weather planting Purity of seed shall be a
minimum of 98 percent and germination shall be a minimum of 85 percent
27 Silt fence shall consist of NCDOT Class A fabric supported by metal posts spaced
not more than 6 feet on center The bottom of the fabric shall be buried a minimum
of 6 inches
28 Gravel for check dams shall be #57 washed stone
29 Aggregate for construction entrance shall be #4 washed stone

210 Stone rip rap for check dams and erosion control shall be NCDOT Class A or B as
shown
3 EXECUTION
31 General Take every practicable measure during construction or suspension to
work to minimize erosion and siltation Measures should include good construction
practices, temporary physical barriers to sediment travel, settling basins for new
ditches, and establishment of vegetative cover
32 Construction Practices
3 2 1 Avoid dumping sod or sediment into any wetland or watercourse
322 Maintain an undisturbed vegetative buffer where possible between a natural
watercourse and trenching and grading operations
323 Avoid equipment crossings of streams, creeks, and ditches where practicable
324 Grade all cut, fill and ditch slopes to minimum slope of 3 1, unless otherwise shown
or directed
33 Temporary Physical Barriers are required where sedimentation on offsite property
or excessive erosion is a problem
3 3 1 Mulch shall be used for temporary stabilization of areas subject to excessive
erosion and for protection of seedbeds after planting where required
1 Apply grain straw and hay at a rate of 75 to 100 pounds per 1,000 square feet
and wood chips at a rate of 500 pounds per 1,000 square feet Jute and mesh
should be installed as per manufacturer's instructions
2 Asphalt emulsion for slope stabilization should be applied at a rate of 1,000
gallons per acre Asphalt emulsion used for anchoring straw should be applied
at a rate of 150 gallons per ton of straw
3 3 2 Silt Fences shall be used at the base of slopes to restrict movement of sediment
from the site Clean silt fence of accumulated sediment after each rainfall event
or when it exceeds a depth of 0 5 feet above natural grade
3 3 3 Stone Check Dams, placed at the discharges of creeks, ditches, and swales, shall
consist of Class A or Class B erosion control stone at minimum two feet high and
three feet thick across the watercourse, with a one foot thick layer of gravel on
upstream side Remove sediment if accumulated to a depth of 1 0 feet at upstream
face
34 Vegetative Cover Establish and maintain permanent vegetative cover on all
unpaved areas disturbed by the work

3 4 1 Preparation of Seedbed Areas to be seeded shall be scarified to a depth of 4
inches and until a firm, well pulverized, uniform seedbed is prepared Lime,
phosphorous and fertilizer shall be applied during the scarification process in
accordance with the following rates
Lime 45 pounds per 1000 square feet
Phosphorous 20 pounds per 1,000 square feet
Fertilizer 17 pounds per 1000 square feet
342 Seeding Disturbed areas shall be seeded with 2 to 3 pounds per 1000 square feet
of the specified seed mixture Seed shall be worked into the bed to a depth of 1/4
inch Regrade and seed eroded areas immediately
3 4 3 Mulch all areas immediately after seeding Mulch shall be applied and anchored as
specified hereinbefore Reapply as necessary to retain cover until grass is
established
35 Construction Entrance Provide an aggregate drive, 20 feet wide by 50 feet long by
6 inches thick at each entrance to the site used by construction vehicles, until such
time as the permanent roadway is constructed Remove sod if accumulated to a
depth greater than 0 5 inches
36 Maintenance The Owner and Contractor shall be responsible for maintaining all
temporary and permanent erosion control measures Temporary structures shall
be maintained until such time as vegetation is firmly established in the area
protected by the structure Permanent streambank protection and grassed areas
shall be maintained until completion of the project Areas that fad to show a
suitable stand of grass or which are damaged by erosion shall be immediately
repaired
END OF SECTION