SW8970531_Historical File_20060922

STORMWATER SYSTEM & EROSION CONTROL NARRATIVE
DEAN HARDWOODS @ LELAND
LELAND, NORTH CAROLINA
For
Dean Hardwoods, Inc.
P.O. Box 1595
Wilmington, NC 28402-1595
[phone]
RECEIVED
SEP 2 2 2006
PROJ # ,� r`' S3(/
Revised September 21, 2006
May 2006
Prepared by:
NORRIS, KUSKE & TUNSTALL CONSULTING ENGINEERS, INC.
902 Market Street
Wilmington, North Carolina 28401
[phone]
[phone] (Fax)
E-mail: [e-mail]
NKT Project No. 06066

NARRATIVE
DESCRIPTION:
The project site is an existing developed 11 acre tract located in the Leland
Industrial Park. The soils of the site consist of lightly vegetated sandy clay topsoil and
grades ranging from 0.5% to 2.0%. Approximately 3 acres will be graded to allow
construction of additional buildings on the site with paved parking and paved access.
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:
This project was permitted on December 20, 1999 for 5 acres of land
disturbance. However, the work was not done and a new plan has been developed.
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. A gravel construction entrance will be constructed
at the only entrance. Maintenance will be provided by the grading contractor and
developer.
STORMWATER MANAGEMENT MEASURES:
. The project site is located in Brunswick County. The site was permitted on
March 2, 2000 as a low -density project with 3.24 acres of allowable impervious area.
The new improvements require a high -density solution. As such, a retention pond was
being proposed. We submitted a revised development plan to modify the existing
permit on June 21, 2006. This modification was approved on July 24, 2006. The
Owner has made some revisions to the site plan that changes some building and
parking configurations. These proposed changes do increase the amount of
impervious coverage beyond the permitted amount of 138,740 SF. We are now
requesting a new modification.
CONSTRUCTION SEQUENCE:
The Contractor will install the gravel construction entrance and silt fence prior to
beginning any clearing and grading operations. Additional silt fence will be installed

when and if conditions warrant during construction. Disturbed areas will be landscaped
or seeded upon completion.

EROSION CONTROL NOTES AND MAINTENANCE PLAN
1. Install erosion control measures before beginning construction or as soon
thereafter as possible. All erosion and sediment control practices will be
checked for stability and operation following every runoff -producing rainfall but in
no case less than once every week. Any needed repairs will be made
immediately to maintain all practices as designed.
2. Maintain the gravel construction entrances in a condition to prevent mud or
sediment from leaving the construction site. The contractor shall inspect the
construction entrances on a daily basis. This will require periodic top dressing
with additional No. 4 stone. Any objectionable materials spilled, washed, or
tracked onto public roadways shall be removed immediately.
3. Install erosion control measures around the drop inlets as shown on the plans to
trap silt during construction. Inspect the erosion control around the inlets after
each rain and make repairs immediately. Remove sediment when it becomes
0.50 deep to provide adequate storage volume for subsequent rains. When the
contributing drainage area has been adequately stabilized, remove all materials
and any unstable soil and either salvage or dispose of it properly. Bring the
disturbed area to proper grade and appropriately stabilize all bare areas around
the drop inlets.
4. Sediment will be removed from behind the silt fence when it becomes 0.5 feet
deep at the fence. The sediment fence will be repaired as necessary to maintain
a barrier. Silt fence stakes shall be spaced 6 feet apart unless a wire backing is
used with 8 foot stake spacing.
5. Inspect temporary sediment traps / check dams, if required for this project, after
each period of significant rainfall. Remove sediment and restore the trap to its
original dimensions when the sediment has accumulated to one-half the design
depth of the trap. Place the sediment that is removed in the designated disposal
area and replace the contaminated part of the gravel facing. Check the structure
for damage from erosion or piping. Periodically check the depth of the spillway
to ensure it is a minimum of 1.5 ft below the low point of the embankment.
Immediately fill any settlement of the embankment to slightly above design
grade. Any riprap displaced from the spillway must be replaced immediately.
After all sediment -producing areas have been permanently stabilized, remove
the structure and all unstable sediment. Smooth the area to blend with the
adjoining areas and stabilize properly
6. The angle for graded slopes and fills shall be no greater than the angle that can
be retained by vegetative cover or other adequate erosion -control devices or
structures. In any event, slopes left exposed will, within 21 calendar days of
completion of any phase of grading, be planted or otherwise provided with

temporary or permanent ground cover, devices, or structures sufficient to restrain
erosion.
7. All disturbed areas shall be seeded within 15 days of disturbance. All seeded
areas will be fertilized, reseeded as FtecessaFy and mulched according to
specifications in the vegetative plan to maintain a vigorous, dense vegetative
cover.
8. More stringent measures shall be used to halt erosion if those shown on this plan
are not effective.
9. All erosion shall be controlled including side slopes before the project is
completed.
10. Remove temporary measures upon completion of project. All permanent
measures will be well established before project closeout.

SECTION 02920
SOIL EROSION AND SEDIMENTATION CONTROL
1. GENE-RAL
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.
1.2 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 15 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
2.1 Asphalt for anchoring mulch shall be Type SS-1 Emulsion.
2.2 Fertilizer shall be 10-10-10 grade or equivalent.
2.3 Lime shall be dolomitic agricultural ground limestone containing not less than 10
percent magnesium oxide.
2.4 Mulch shall be small grain straw, hay, wood chips, asphalt emulsion, jute or other
suitable material free of undesirable weed seed.
2.5 Phusphate shall be 20 percent superphosphate or equivalent.
2.6 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.
2.7 Silt fence shall consist of NCDOT Class A fabric supported by wood or metal
posts spaced not more than 6 feet on center. The bottom of the fabric shall be buried a
minimum of 6 inches.
2.8 Gravel for check dams shall be #57 washed stone.

2.9 Aggregate for construction entrance shall be #4 washed stone.
2.10 Stone rip rap for check dams and erosion control shall be NCDOT Class A or B
as shown.
3. EXECUTION
3.1 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.
3.2 Construction Practices
3.2.1 Avoid dumping soil or sediment into any wetland or watercourse.
3.2.2 Maintain an undisturbed vegetative buffer where possible between a natural
watercourse and trenching and grading operations.
3.2.3 Avoid equipment crossings of streams, creeks, and ditches where practicable.
3.2.4 Grade all cut, fill and ditch slopes to minimum slope of 3:1, unless otherwise
shown or directed.
3.3 Temporary Physical Barriers are required where sedimentation on off site
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 1000 square feet
and wood chips at a rate of 500 pounds per 1000 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.
3.4 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 1000 square feet
Fertilizer: 17 pounds per 1000 square feet
3.4.2 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.
3.5 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 soil if accumulated to a depth
greater than 0.5 inches.
3.6 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 fail to show a suitable stand of
grass or which are damaged by erosion shall be immediately repaired.
END OF SECTION

J. Phillip Norris, P.E.
NORRIS, KUSKE &TU NSTALL John A. Kuske, III, P.E.
John S. Tunstall, P.E.
CONSULTING ENGINEERS, INC. J.A.Kuske,RE. ofCounsel
September 21, 2006
Ms. Linda Lewis
NC DENR / Division of Water Quality
Water Quality Section
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
Re: State Stormwater Permit Modification Submittal
Dean Hardwoods @ Leland
Leland, NC
NKT Project No. 06066
Dear Ms. Lewis:
�q4 A,531Mc� �.
Enclosed are two (2) sets of plans for the subject project, one (1) drainage area plan,
one (1) set of calculations, one (1) copy of the stormwater narrative, the original
Division of Water Quality Stormwater Management Permit application, the original
SWU-102 supplement form and a $420.00 check for the permit review fee.
Please review this information for approval and contact us with any questions or
comments you may have. Thank you for your assistance on this project.
Sincerely,
NORRIS, KUSKE & TUNSTALL
CONSULTING ENGINEERS, INC.
J. illip Norris, P.E.
JPN/asn
06066 09-21-06-s-sw mod -Rr
Enclosures
cc: Charles Dean, Jr. (w/ Copy of Paperwork)
902 Market Street - Wilmington, NC 28401-4733 - Phone: 910,343.9653 - Fax: [phone]

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Project No. SW8 O� of WATF9
Project Name- moo`' 4�
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County: PAL
Dear -
The Wilmington Regional Office of the Division of Water Quality received
your stormwater application and $420.00 fee on 41 -,-Z 2 996,
Your project will be reviewed within 75 days of receipt, and you will be
notified if additional information is needed. Please be advised that the
construction of built -upon area may not commence until the stormwater
permit is issued.
if you have any questions, please contact any member of the stormwater
review staff in the Wilmington Regional Office at [phone].
Date Sent: �� �' Patricia Collins