20061421 Ver 1_Stormwater Info_20070727

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11010 Raven Ridge Road Raleigh, North Carolina 27614 Phone: [phone] Fax: [phone]
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We Transmit to you Herewith:
^ Drawings
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^ As per your request
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File:
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Remarks
If enclosures are not as listed as above, kindly notify us at once. ,"~ r, ;q-~ s~ • r... .,.,,
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Charlotte Office: Greensboro Office:
236 L.ePhillip Court, Suite C 3817-E Lawndale Drive
Concord, NC 28025 Greensboro, NC 27455
Phone: [phone] Phone:; [phone]
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July 25, 2007
S&EC Project No. 10409.D1
L~' /`fa/
Environmental Consultants, PA
:Road Raleigh, North Carolina 27614 Phone: [phone] • Fax: [phone]
www.SandEC.com
Ms. Cyndi Karoly and Ms. Annette Lucas
401 Oversight & Express Permits Unit
2321 Crabtree Boulevard
Raleigh, NC 27604
Re: Stormwater Management Plan -Retrofit
Middle Creek Commons Bioretention Area
Johnston County, North Carolina
Dear Ms. Karoly and Ms. Lucas:
Enclosed please fmd design documents for a single Bioretention area for a retrofit portion of the original
Stormwater Management Plan prepared by Chas H. Sells, Inc. of Cary, NC. The original DWQ Permit No.
06-1421 was approved on September 18, 2006. This retrofit design has also been forwarded to Ms.
Chandra Coats, P.E. of Johnston County. As a delegated Stormwater review program, we understand that
Johnston County approval is a requirement of the aforementioned DWQ permit.
The original plan called for all site Stormwater to be treated in a single extended detention stonnwater
wetland. A review by Johnston County of the asbuilt dimensions of the stonnwater wetland showed that it
was not sufficiently sized to treat the entire drainage area. The proposed retrofit consists of a single
Bioretention area and has been sized to treat 0.5 acres of impervious area which was inadvertently excluded
from the original calculations.
Included in the attached documents are the project design narrative and supporting calculations, DWQ
Stormwater Management Permit Application Fonn -Bioretention Basin Supplement Worksheet, and
preliminary Construction Drawings and Technical Specifications. We understand that Total Nitrogen (TN)
loading calculations and the associated offset payment are being calculated by Chas H. Sells, Inc. and will
be addressed in a separate correspondence.
If you have any questions or comments regarding these documents please do not hesitate to contact us.
Sincerely,
SO ENVIItO ENTAL CONSULTANTS, PA
. ~-
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Patric .Smith, P. .
Design Program Manager

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TECHNICAL SPECIFICATIONS
FOR
MIDDLE CREEK COMMONS
STORMWATER BIORETENTION AREA
JOHNSTON COUNTY, NORTH CAROLINA
S&EC Project No. I0409.DI
JULY 2007
PRELIMINARY
NOT FOR CONSTRUCTION
Rebecca S. Wargo, P.E.
NC License No. 31266
Soil & Environmental Consultants, PA
11010 Raven Ridge Road Raleigh, North Carolina 27614 Phone: [phone] Fax: [phone]
www.SandEC.com

TECHNICAL SPECIFICATIONS TABLE OF CONTENTS
' SECTION 1 -GENERAL REQUIREMENTS 1 4.2 MEASUREMENT AND PAYMENT 3
' 4
3 UTILITY LOCATION AND PROTECTION 3
1.1 SECTION INCLUDES 1 .
4
4 SEDIMENTATION AND EROSION CONTROL 3
1.2 SUMMARY OF WORK 1 .
1.3 WORKFORCE EXPERIENCE 1
4.5
CONSTRUCTION LAYOUT
3
t 4.6 AND STRIPPING
GRUBBING
CLEARING 3
1.4 MEASUREMENT AND PAYMENT 1 ,
,
SECTION 2 -TEMPORARY FACILITIES 1 4.7 DEWATER[NG 3
SECTION 5 -EXCAVATION 4
2.1 SECTION INCLUDES 1
i 2.2 MEASUREMENT AND PAYMENT 1 5.1 SECTION INCLUDES 4
' 2.3 TEMPORARY SANITARY FACILITIES 1 5.2 MEASUREMENT AND PAYMENT 4
2.4 TRAFFIC CONTROL 1 5.3 REFERENCES 4
' 2.5 STAGING AREA l 5.4 PREPARATION 4
' 2.6 COORDINATION WITH OWNER 1 5.5 EXCAVATING 4
2.7 PROTECTION OF EXISTING FACILITIES, 5.6 PLANTING PREPARATION 4
' STRUCTURES, AND SERVICES 2 5.7 TOLERANCES 4
2.8 PROTECTION OF INSTALLED WORK 2 SECTION 6 -FILLING, BACKF[LLING, AND COMPACTION 5
2.9 PROGRESS CLEANING AND WASTE REMOVAL 2
5
6.1 SECTION INCLUDES
2.10 FINAL CLEANING 2
6.2
MEASUREMENT AND PAYMENT
5
SECTION 3 -QUALITY CONTROL 2
' 6.3 REFERENCES 5
3.1 SECTION INCLUDES 2 6.4 FILL MATERIALS 5
3.2 MEASUREMENT AND PAYMENT 2 6.5 PREPARATION 5
' 3.3 REFERENCES 2 6.6 BACKFILLING, FILLING, AND SURFACE
3.4 CONSTRUCTION OBSERVATION 2 PREPARATION 5
3.5 PLANTING OBSERVATION 2 6.7 COMPACTION 5
' SECTION 4 -SITE PREPARATION 3 6.8 PROTECTION OF FINISHED WORK 5
6.9 TOLERANCES 5
4.1 SECTION INCLUDES 3

SECTION 7 -OUTLET CONTROL STRUCTURE 6 9.5 SEEDBED PREPARATION
7.1 SECTION INCLUDES 6 9.6 SEEDING
7.2 MEASUREMENT AND PAYMENT 6 9.7 SEEDING DATES
7.3 REFERENCES 6 9.8 SOIL AMENDMENTS
7.4 MATERIALS 6 9.9 MULCH
SECTION 10 -SEDIMENT AND EROSION CONTROL
7.5 PRECAST CONCRETE RISER 6
7.6 OUTLET BARREL 6 10.1 SECTION INCLUDES
7.7 UNDERDRAIN COLLECTION SYSTEM 7 10.2 MEASUREMENT AND PAYMENT
7.8 SUBMITTALS 8 10.3 REFERENCES
SECTION 8 - BIORETENTION AREA PLANTING 8 10.4 MATERIALS
8.1 SECTION INCLUDES 8 10.5 SILT FENCE
8.2 MEASUREMENT AND PAYMENT 8 10.6 INSTALLATION OF EROSION CONTROL
8.3 REFERENCES 8 MATTING
SECTION 11 -SITE MAINTENANCE
8.4 GENERAL 8
8.5 PLANT SUBSTITUTION g 11.1 SECTION INCLUDES
8.6 PLANTING PREPARATION 9 11.2 MEASUREMENT AND PAYMENT
8.7 CONTAINER GROWN PLANTS 9 11.3 EXECUTION
8.8 BALL & BURLAP PLANTS 9
8.9 PLANT INSTALLATION 9
8.10 PLANTING PERIODS 9
8.11 SUBMITTALS 9
SECTION 9 -PERMANENT SEEDING 10
9.1 SECTION INCLUDES 10
9.2 MEASUREMENT AND PAYMENT 10
9.3 REFERENCES 10
9.4 GENERAL 10
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SECTION 1 -GENERAL RE UIREMENTS
Q
' 1.1 SECTION INCLUDES
General requirements and information related to the work including,
summary of work, measurement and payment, and reference to
SPECIAL CONTRACT PROVISIONS (if applicable based on
contractual agreement(s) between Owner and Contractor).
1.2 SUMMARY OF WORK
The MIDDLE CREEK COMMONS STORMWATER
B[ORETENTION AREA project consists of the earthwork and
construction of a single stormwater bioretention area and planting of
this device. Refer to the Construction Drawings and to these
Specifications for project details.
1.3 WORKFORCE EXPERIENCE
The Contractor is required to have the appropriately experienced
personnel on site to operate equipment and insure that the construction
sequence and installation procedures are followed as determined by
the Engineer. Contractor personnel should be familiar with general
grading, pipe installation procedures, and landscape planting methods.
1.4 MEASUREMENT AND PAYMENT
All measurement and payment for services performed shall be as
indicated in the SPECIAL CONTRACT PROVISIONS if applicable.
As such, they are not defined in these Technical Specifications.
END OF SECTION
SECTION 2 -TEMPORARY FACILITIES
2.1 SECTION INCLUDES
Required temporary facilities including site access, temporary sanitary
facilities, barriers, traffic control, construction staging area, protection
of existing facilities and installed work, erosion control measures, and
general site cleaning.
2.2 MEASUREMENT AND PAYMENT
See SPECIAL CONTRACT PROVISIONS if applicable.
2.3 TEMPORARY SANITARY FACILITIES
Provide and maintain required sanitary facilities and enclosures. No
permanent sanitary facilities exist at the project site.
2.4 TRAFFIC CONTROL
Provide traffic control as required to protect the public safety.
Conform to all requirements of State, County, City, or local laws and
requirements for traffic control. Conformance with contract
documents does not relieve the Contractor from responsibility for
public safety.
2.5 STAGING AREA
Areas will be designated on the site for staging of Contractor's
equipment and construction materials for the duration of construction.
These areas shall be maintained so as to provide a sightly appearance
and a safe working environment. No other areas shall be used for this
purpose without the approval of the Owner and Engineer.
Storage of oil or fuel shall be confined to the construction staging
areas. Refueling of all vehicles and equipment shall occur only in the
staging areas. Refueling ofnon-mobile equipment located outside of
the staging areas will be allowed with Engineer approval. No
refueling shall occur within fifty feet of any excavation, the stream
channel or any other surface water or wetland. The Contractor shall
take appropriate measures to ensure safe fueling procedures are
followed.
Contractor shall provide appropriate spill prevention measures. The
Contractor shall provide a spill containment plan for both the staging
areas and the construction area. The plan shall include prevention,
containment, and control of fuel or oil spillage from equipment
storage, refueling, maintenance, and operation on site. The plan shall
address both mobile and non-mobile equipment used during
construction. Emergency spill cleanup equipment for oil and fuel
spills shall be stored on site. The Contractor shall notify the Owner
and all applicable agencies within 24 hours of any spill.
2.6 COORDINATION WITH OWNER
Perform coordination with Owner and schedule work to ensure limited
disruption of daily operations of Owner. Obtain approval from Owner
prior to the disruption of any access to site utilities, structures, or
locations. Coordinate the disruption of any utility services without
regard to duration. Provide continuous representation/point of contact
for Owner during all site activities. Coordinate for access to
construction site to reduce the potential for disruption to Owner.
Access to construction site shall be limited to the entrance designated
S&EC Project No. 10409.D1 Page 1
Middle Creek Commons Stormwater Bioretention Area
Technical Specifications
July 2007

by the Owner. Only access points approved by the Owner shall be
used during construction.
2.7 PROTECTION OF EXISTING FACILITIES, STRUCTURES,
AND SERVICES
The project vicinity to include existing access routes will continue to
be used for daily operations by Owner throughout the duration of
construction. The Contractor shall protect existing facilities,
structures, and services throughout the duration of construction and
provide special protection where specified in individual specification
sections. Provide temporary and removable protection for existing
structures and services where necessary.
Control activity in immediate vicinity of facilities, structures, and
services to prevent damage. Any facility, structure, or services
disturbed or damaged, either intentionally or unintentionally, shall be
removed and reinstalled or repaired to the Owner's satisfaction.
Repairs to or replacement of facilities, structures, or services shall be
performed at the expense of the Contractor. Repairs and/or
replacement shall occur without additional cost to the Owner.
2.8 PROTECTION OF INSTALLED WORK
Protect installed work and provide special protection where specified
in individual specification sections. Provide temporary and removable
protection for installed work and products. Control activity in
immediate work area to prevent damage. Any installed work disturbed
or damaged, shall be removed and reinstalled or repaired to the
Engineer's satisfaction. Repairs to or replacement of installed work
shall be performed at the expense of the Contractor. Repairs and
replacement shall occur without additional cost to the Owner.
2.9 PROGRESS CLEANING AND WASTE REMOVAL
Maintain areas free of waste materials, debris, and rubbish. Maintain
site in a clean and orderly condition. Collect and remove waste
materials, debris, and rubbish from site daily and dispose off site.
Remove temporary utilities, equipment, facilities, and materials prior
to Final Application for Payment inspection. Restore existing
facilities used during construction to original condition.
2.10 FINAL CLEANING
Execute final cleaning prior to final project walkthrough with
Agencies, Owner, and Engineer. Clean site and all installed work.
Remove waste and surplus construction materials, rubbish, temporary
sanitary, and construction facilities from the site.
END OF SECTION
SECTION 3 -QUALITY CONTROL
3.1 SECTION INCLUDES
Observation of construction and planting operations.
3.2 MEASUREMENT AND PAYMENT
See SPECIAL CONTRACT PROVISIONS if applicable.
3.3 REFERENCES
For products or workmanship specified by association, trade, or other '
consensus, comply with requirements of the standard, except when
more rigid requirements are specified herein or are required by
applicable codes.
Section 8 (Bioretention Area Planting) of these Specifications. ,
3.4 CONSTRUCTION OBSERVATION
The Owner has engaged the Engineer or his representative to
periodically observe construction operations as required in these
Specifications. Observation of construction operations does not
relieve Contractor of obligation to perform work to contract
requirements. The Contractor shall allow observation personnel
access to materials, and the construction site as required.
3.5 PLANTING OBSERVATION
The Owner has engaged the Engineer or his representative to observe
planting operations as required in these Specifications. Observation of
planting operations does not relieve Contractor of obligation to
perform work to contract requirements. The Contractor shall allow
observation personnel access to materials (see Section 8), and the
construction site as required.
END OF SECTION
S&EC Project No. 10409.D1 Page 2 Technical Specifications
Middle Creek Commons Stormwater Bioretention Area July 2007 '

' SECTION 4 -SITE PREPARATION
4.1 SECTION INCLUDES
Site preparation shall consist of utility location and protection,
' clearing, grubbing and stripping of the work area, and construction of
any required temporary construction access routes and temporary
sediment and erosion control measures.
4.2 MEASUREMENT AND PAYMENT
See SPECIAL CONTRACT PROVISIONS if applicable
4.3 UTILITY LOCATION AND PROTECTION
The Contractor shall locate or arrange for the location of all existing
utilities and mark for identification. Contractor shall provide means
for protecting utilities from any damage during site work. Repair of
damaged utilities shall be at Contractor's expense. Coordination
should be made with Owner to locate and mark site specific utilities.
NC ONE CALL (1-800-632-4949)
4.4 SEDIMENTATION AND EROSION CONTROL
The Engineer has assumed that land disturbance associated with this
project is included in the previously approved Erosion and Sediment
Control Plan prepared by others. The Contractor shall confirm this
assumption prior to construction. The site Contractor will be
responsible for the installation, inspection, repair, and supplementation
of all erosion control measures. Contractor shall be responsible for
preventing erosion on the site and sedimentation off the site. Methods
' shall be employed as recommended in the North Carolina Erosion and
Sediment Control Planning and Design Manual, latest edition.
t At a minimum, these temporary erosion and sediment control measures
as described in Section 10 (Sediment and Erosion Control) shall be
installed. The Contractor shall conform to all the rules, regulations,
laws, and ordinances of the State of North Carolina, and of all other
' authorities having jurisdiction.
4.5 CONSTRUCTION LAYOUT
The Contractor is responsible for the construction surveying and
layout. The maintenance and preservation of the construction stakes is
the responsibility of the Contractor. The replacement of damaged or
disturbed construction stakes or supplemental staking will be the
Contractor's responsibility. The Contractor is required to have a laser
level or other equivalent equipment available on site during the entire
period of construction to check grade/elevations as construction
progresses.
~ 4.6 CLEARING, GRUBBING, AND STRIPPING
Conform to applicable code for environmental requirements, disposal
of debris, and erosion and sedimentation control as described above.
Coordinate clearing work with utility Owners and operators as
described above. Establish a schedule for daily removal of debris from
the site. Debris may not be stockpiled on site. Clear areas required for
access to site and execution of work. Remove trees, stumps, other
wood, metal, or rubble debris within work areas.
' Remove stumps, main root ball, and all roots with a diameter greater
than 2 inches. Leave area in a clean and neat condition. Grade site
S&EC Project No. 10409.D1
' Middle Creek Commons Stormwater Bioretention Area
surface daily to control the direction of channelized flow and prevent
free standing surface water.
In areas where grading will be implemented, the existing top six inches
of soil should be removed and stockpiled prior to excavation or
construction efforts.
4.7 DEWATERING
Comply with all rules, regulations, laws, and ordinances of the State of
North Carolina, and of all other authorities having jurisdiction.
Provide without additional cost to the Owner all labor, materials,
equipment, and services necessary to make the work comply with such
requirements. Install all barriers, erosion and sedimentation control,
silt fences, turbidity curtains, and other measures as required to
prevent off-site sedimentation.
Under no circumstances shall fill or other construction materials be
placed in excavations containing standing water without approval of
the Engineer.
END OF SECTION
Page 3 Technical Specifications
July 2007

SECTION 5 -EXCAVATION
5.1 SECTION INCLUDES
Provide all necessary equipment and labor to excavate for construction
of stormwater bioretention area as shown on the Drawings without
damage or interruption of utility service.
5.2 MEASUREMENT AND PAYMENT
See SPECIAL CONTRACT PROVISIONS if applicable.
5.3 REFERENCES
Occupational Safety and Health Administration -Construction
Standards for Excavations, 29 CFR Part 1926.650-.652.
When the Specifications or Drawings differ from the requirements of
the above-referenced documents, the more stringent requirements shall
apply.
5.4 PREPARATION
Locate, identify, and protect utilities from damage as described in
Section 4.3. Notify utility companies and coordinate for and/or install
protection of utilities where necessary.
5.5 EXCAVATING
Protect all utilities and structures that may be damaged by excavating
work. In areas where grading will be implemented, the existing top six
inches of soil should be removed and stored prior to construction or
reconstruction efforts. Excavated areas shall be constructed to line,
slope, and dimension described in the Drawings. Boundaries of
graded areas will be graded such to form a smooth blended interface
with the surrounding ground surface.
Excavate subsoil to accommodate bioretention area, and other site
grading as shown on the Drawings. Perform Work in accordance with
Occupational Safety and Health Administration (OSHA) -
Construction Standards for Excavations, 29 CFR Part 1926.650-.652.
Provide trench and excavation protection as required. Slope banks
with machine to stable slope or flatter until shored. Grade top
perimeter of excavation to prevent surface water from draining into
excavation. Where required to protect utilities, perform excavation by
hand.
Remove cemented subsoil, boulders, and rock. Cemented subsoil,
boulders, and rock shall be defined as materials which can not be
readily broken down to less than 1/4 cu. yd. solid volume by
concentrated effort of atrack-mounted excavator, equivalent to a
Caterpillar 315, equipped with rock teeth. Notify Engineer if
subsurface conditions require excavation of larger cemented subsoil,
boulders, and rock, and discontinue work in affected area until notified
to resume work. If cemented subsoil, boulders, or rock greater than '/x
cu, yd. solid volume is encountered above required excavation,
Engineer may direct adjustment in construction elevations based on
site and sub-surface conditions encountered during construction.
Adjustment of elevations shall not be a basis for additional payment.
Correct areas over excavated in accordance with Section 6 (Filling,
Backfilling, and Compaction). Stockpile select excavated material on-
S&EC Project No. 10409.D1
Middle Creek Commons Stormwater Bioretention Area
site for re-use in backfill where appropriate. Stockpile location shall
be subject to Owner and Engineer approval. Excess material not
utilized during construction shall be removed from the site and
disposed of at the Contractor's expense. No additional payment will
be made for material haul and disposal.
5.6 PLANTING PREPARATION
Along the outside rim of the bioretention area, the stockpiled topsoil
should be redistributed as directed by the Engineer in preparation of
stabilization operations as described in SECTION 10 (Sediment &
Erosion Control) of these Specifications.
All areas where topsoil is distributed shall be disked or harrowed to
ensure soil aeration and to increase the surface roughness prior to
planting.
5.7 TOLERANCES
Top surface of graded areas (where applicable): Plus or minus two
inches from required elevation.
Top surface of fill, backfill, and topsoil: Plus or minus two inches
from required elevations.
END OF SECTION
Page 4 Technical Specifications
July 2007

SECTION 6 -FILLING, BACKFILLING, AND COMPACTION
6.1 SECTION INCLUDES
Provide all necessary equipment and labor to perform filling,
backfilling of bioretention area, and other site work as shown on the
Drawings without damage or interruption of utility service.
Replacement of removed topsoil shall be as described in SECTION 10
(Sediment & Erosion Control) of these Specifications.
6.2 MEASUREMENT AND PAYMENT
See SPECIAL CONTRACT PROVISIONS if applicable.
6.3 REFERENCES
ASTM D2487 -Classification of Soils for Engineering Purposes
(Unified Soils Classification System).
When the Specifications or Drawings differ from the requirements of
the above-referenced documents, the more stringent requirements shall
apply.
6.4 FILL MATERIALS
Soil excavated during construction and stockpiled may be re-used as
fill elsewhere on site if approved by the Owner.
Waste areas may be available in the immediate vicinity of the project
site. Coordination with the Owner for waste areas is the responsibility
of the Contractor. If soil excavated during cut operations is not re-
used and no waste areas are available on site, it shall be removed from
the site to an appropriate disposal facility at no additional charge to
Owner. The Contractor shall be responsible for the payment of all fees
associated with transportation and disposal of unusable materials.
Fill media for bioretention area shall be of the consistency and
specification shown on the Drawings. Fill media shall be tested at the
Contractors expense. Results of soils tests shall be provided to the
Engineer and Owner for review and approval. No variance from
specifications shall be allowed without the approval of the Engineer.
6.5 PREPARATION
' Within trenches excavated for outlet pipe or structure installation
compact subgrade to density requirements for subsequent backfill
materials. Cut out soft areas of subgrade not capable of compaction in
place. Backfill with ordinary fill material and compact to density
equal to or greater than requirements for subsequent fill material. No
other areas within the footprint of the bioretention area shall be
compacted
' 6.6 BACKFILLING, FILLING, AND SURFACE PREPARATION
Loose materials within excavated bioretention area shall be removed
by hand as necessary to reduce potential for compaction of in-situ
soils.
Bioretention media material shall be placed loosely in even lifts of no
' greater than 12 inches within excavated bioretention area. No
compaction effort shall be applied. Drop height of material shall not
exceed 2 feet. Care shall be taken not to disturb riser, barrel, or under-
drain system during backfilling operations.
For trenches excavated for pipe placement, backfill areas to contours
and elevations with unfrozen materials. For backfilling of trench
excavated for pipe installation and other low points, lift thickness shall
not exceed 12". Do not backfill over porous, frozen, or spongy
subgrade surfaces. Employ a placement method that does not disturb
or damage other work. Slope grade minimum 2 inches in 10 feet,
unless noted otherwise. Make gradual grade changes. Blend slope
into level areas. Place backfill and fill in loose level lifts not to exceed
six inches in thickness before compaction. Make gradual grade
changes. Blend slope into level areas.
Earth fill in slopes, channel plugs, and other structures designed to
restrain the movement of water shall be placed so as to meet the
following additional requirements:
a. The distribution of materials throughout each zone shall be
essentially uniform and the fill shall be free from lenses, pockets,
streaks, or layers of material differing substantially in texture or
gradation from the surrounding materials.
b. Backfill areas to contours and elevations with unfrozen materials.
Do not backfill over porous, frozen, or spongy subgrade surfaces.
Employ a placement method that does not disturb or damage
other work. Place backfill and fill in loose level lifts not to
exceed six inches in thickness before compaction. Make gradual
grade changes. Blend slope into level areas. Slope grade
minimum 2 inches in 10 feet, unless noted otherwise.
c. If the surface of any layer becomes too hard and smooth for
proper bond with the succeeding layer, it shall be scarified
parallel to the axis of the fill to a depth of not less than 2 inches
before the next layer is placed.
6.7 COMPACTION
No compaction effort shall be applied within the footprint of the
bioretention area or to the bioretention media.
Compaction above and beneath riser/barrel system shall be performed
using the appropriate equipment. Compacted areas shall be trafficked
with the equipment minimum of two passes in both directions for each
compacted soil lift.
6.8 PROTECTION OF FINISHED WORK
Protect finished work. Reshape and re-compact fills subjected to
vehicular traffic or damaged by erosion.
6.9 TOLERANCES
Top surface of graded bioretention area (where applicable): Plus or
minus two inches from required elevation.
Top surface of fill, backfill, and topsoil: Plus or minus two inches
from required elevations.
END OF SECTION
S&EC Project No. 10409.D1 Page 5
' Middle Creek Commons Stormwater Bioretention Area
Technical Specifications
July 2007

SECTION 7 -OUTLET CONTROL STRUCTURE
7.1 SECTION INCLUDES
This section consists of the general requirements for the construction
of all components of the all outlet control structures to include, but not
limited to the pre-cast concrete riser (RCP) structure pipe, the outlet
ban•el (CPP), and the underdrain collection system.
7.2 MEASUREMENT AND PAYMENT
See SPECIAL CONTRACT PROVISIONS
7.3 REFERENCES
The following Specifications and methods form a part of this
specification:
NCDOT -Standard Specifications for Roads and Structures
ASTM C478 -Standard Specification for Precast Reinforced Concrete
Manhole Sections
AASHTO M252 -Standard Specifications for Corrugated
Polyethylene Drainage Tubing
ASTM D2000- Standard Classification System for Rubber Products in
Automotive Applications
ASTM D2487 -Standard Classification of Soils for Engineering
Purposes (Unified Soils Classification System)
ASTM D3212 -Standard Specifications for Joints for Drain and Sewer
Plastic Pipes using Flexible Elastomeric Seals
ASTM D3776 -Standard Test Methods for Mass Per Unit Area
(Weight) of Woven Fabric
ASTM D4491 -Standard Test Methods for Water Permeability of
Geotextiles by Permittivity
ASTM D4632 -Standard Test Method for Grab Breaking Load and
Elongation of Geotextiles
ASTM D4833 -Standard Test Method for Index Puncture Resistance
of Geotextiles, Geomembranes, and Related Products
ASTM F477 -Standard Specifications for Elastomeric Seals (Gaskets)
for Joining Plastic Pipe
ANS[ B18.22.1-Current Edition
AWWA C501 -American Water Works Association
SECTION 5 (Excavation) of these Specifications
SECTION 6 (Filling, Backfilling, and Compaction) of these
Specifications
When the Specifications or Drawings differ from the requirements of
the above- referenced documents, the more stringent requirements
shall apply.
7.4 MATERIALS
Materials include those required for the construction of the Outlet
Control Structure (including the riser and barrel), and underdrain
collection system.
Precast concrete structure (Manhole structure): Shall be furnished,
fabricated and placed in conformity with the shape and dimensions
shown on the plans and as specified. Manhole sections shall be
precast concrete conforming to ASTM C478 of the size and depth
shown on the Drawings with rubber gasket joints. Lift holes shall not
be cast into units.
Drain Pipe and Fittings: Shall be AASHTO M252 Type S or SP
(Smooth Interior, Corrugated Exterior) with a nominal internal
diameter of 4 inches. Maximum 0.5 inch perforations.
Hypalon Bands: Shall have a minimum thickness of 36 mils. Band
shall be bonded to concrete with a 2-inch epoxy strip both top and
bottom. Apply epoxy to both surfaces. Bond Hypalon to itself in
accordance with manufacturer's recommendations. Only one splice
allowed per band.
Nonwoven Geotextile: Geotextile shall be a nonwoven fabric with a
minimum weight of 4 ounces per square yard (ASTM D3776), a
minimum grab strength in either direction of 180 pounds (ASTM
D4632), a minimum puncture resistance of (ASTM D4833) of 85
pounds, and permeability of (ASTM D4491) greater than 0.2 cm/sec.
Fabric meeting these Specifications shall still be subject to approval or
rejection by the Engineer. At the time of installation, the fabric will be
rejected if it has defects, rips, holes, flaws, deterioration, or damage
incurred during the manufacture, transportation, or storage.
NCDOT Coarse Aggregate Size #57: Shall conform to gradation
requirements of Table 1005-1, NCDOT Specifications.
7.5 PRECAST CONCRETE RISER
The Contractor shall furnish all labor, tools, equipment, materials,
supplies and other requirements necessary for the installation of the
riser as shown on the plans.
All joints on the riser shall be sealed with joint binder and wrapped
externally with a hypalon band.
Pumps shall be utilized to keep the excavation free of standing water
during construction. The Contractor may utilize a layer of crushed
stone in the excavation for leveling purposes. Stone thickness shall
not exceed 4 inches.
Materials shall not be unloaded by dropping, throwing or otherwise
carelessly removing from delivery vehicles in such a manner as to alter
the configuration or damage the materials. Damaged items shall be
replaced or repaired prior to erection.
7.6 OUTLET BARREL
The Contractor shall furnish all labor, tools, equipment, materials,
supplies and other requirements necessary for the installation of the
corrugated plastic pipe (CPP) outlet barrel as described herein and
shown on the Drawings.
Each joint shall be wrapped with nonwoven geotextile as specified
below. Joints shall be overlapped with nonwoven geotextile a
S&EC Project No. 10409.D1 Page 6
Middle Creek Commons Stormwater Bioretention Area
Technical Specifications
July 2007 '

minimum of 12" wide, centered on the joint. Geotextile wraps shall be
taped on both sides of joint to reduce the potential for movement
during backfill operations.
subgrade preparation for the pipe shall be performed immediately
prior to placement of pipe with required joint gaskets in the trench.
The trench shall be dug to the required alignment and depth as shown
on the Drawings or directed by the Engineer, and only so far in
advance of the pipe laying as the Engineer shall permit.
The width of the trench shall be kept at a minimum. Except where
improved bedding is required, mechanical excavation of trenches for
the pipe shall not extend lower than 1" above the finished subgrade
elevation. Correction of a subgrade that is too low shall be done only
by placing and compacting suitable material (approved by the
Engineer) over the entire width of trench and regrading.
If the trench bottom should be softened by flooding, rain or other
causes, the unsuitable material shall be removed and replaced with
suitable material properly shaped and tamped to grade.
Care shall be taken during loading, transportation, unloading, and
installation to prevent damage to the pipes or fittings. All pipe and
fittings shall be carefully examined before installing and no piece shall
be installed which does not conform to the appropriate ASTM
Specification. Any defective, damaged, or unsound material shall be
repaired or replaced as directed by the Engineer.
All pipe shall be laid by experienced workmen with straight lines, even
grades, and all joints shall be perfectly fitted. All pipe fittings and
accessories shall be carefully lowered into the trench with suitable
equipment in a manner that will prevent damage to pipe and fittings.
Under no circumstances shall pipe or accessories be dropped or
dumped into the trench. Pipes shall be laid to the required lines and
grades on prepared subgrade or improved bedding. Any bedding
disturbed during the installation of the pipe shall be repaired prior to
resuming the placement of the pipe and placement of the concrete
cradle. The pipe shall be installed with the bell ends in the direction
of laying. Pipeline for gravity means shall begin at the low end of the
run and all pipe shall be laid with the bells or socket uphill.
All foreign matter or dirt shall be removed from the interior and ends
of pipe and accessories before it is lowered into position in the trench.
When joined in the trench, the pipe shall form a smooth line and shall
be fitted together so that the alignment and scope are correct. Pipe
shall not be trimmed except for closure, and pipe not making a good fit
shall be removed. No pipe shall be laid until the preceding length has
been completely aligned and secured. Pipe shall be kept clean by
means approved by the Engineer, during and after laying.
If any defective pipe or fittings are discovered after installation, they
shall be removed and replaced with sound pipe and fittings or shall be
repaired by the Contractor in an approved manner and at his own
expense. The installed pipe shall not be disturbed in any manner and
its proper grade and alignment shall be maintained during pipe joining,
pipe embedment, and backfilling operation.
The interior surface of all pipes shall be cleaned when installed and
shall be kept clean until final acceptance. Temporary bulkheads shall
be placed in all open ends of pipelines when pipe laying is not actively
in progress. The bulkheads shall be designed to prevent the entrance
of dirt or debris and shall not be removed until pipe laying is resumed.
When danger of water entering the pipeline may exist, the bulkheads
shall be designed to prevent the entry of water. Adequate precaution
S&EC Project No. 10409.D1
Middle Creek Commons Stormwater Bioretention Area
shall be taken by the Contractor to prevent the flotation of pipes
during backfill operations or in the event of water entering the trench.
Embedment shall be defined as that portion of the trench from the
subgrade to an imaginary line drawn 18" above the top of the pipe.
Embedment materials shall be the excavated soil or borrow material,
subject to the Engineer's approval. Pipe embedment materials shall be
deposited by hand tools in layers not to exceed 6" in uncompacted
depth. Deposition and compaction shall be done simultaneously and
uniformly on both sides of the pipe so as to insure adequate lateral and
vertical stability of the installed pipe system during subsequent,
embedment and backfill operations. In no case will impact or
unbalanced deposits of materials be allowed.
Backfill for pipelines shall be defined as that portion of the trench
from an imaginary line drawn 18" above the top of the pipe to the
original ground surface. Backfilling in general will be done with
suitable excavated materials. Debris, material not given to adequate
compaction, and stone over 1" in diameter will not be allowed within
the trench limits. If material excavated is not suitable, special backfill
of local suitable soil shall be used.
7.7 UNDERDRAIN COLLECTION SYSTEM
The Contractor shall provide all labor, materials, equipment, and
services necessary for the proper completion of work and any
necessary fabrication work indicated on the Drawings and specified
herein. Contractor shall install the underdrain collection systems to
the sizes, shapes and profiles shown. Where items are shown on the
Drawings, but not specifically noted, they shall be of the size,
arrangement and quality for the proper completion of the work.
Underdrain collection systems shall be constructed in the presence of
the Engineer.
Trench excavated for the underdrain system shall be approved by the
Engineers prior to the placement of system materials. The trench shall
be dug to the required alignment and depth as shown on the Drawings
or as directed by the Engineer, and only so far in advance of the pipe
laying as the Engineer shall permit. The width of the trench shall be
kept to a minimum. Loose material shall be removed by hand.
Geotextile fabric shall be placed in the trench free of tears and folds.
Fabric shall be placed against trench walls to eliminate voids and
reduce the potential for tearing of fabric during backfill operations.
Aggregate shall be carefully placed in trench in lift thicknesses of not
more that 3 inches. Install drain pipes for discharge to the outlet
control structure as shown on the plans. Solid pipe segment 2 feet in
length shall be used to connect perforated pipe to riser structure.
Care shall be taken during loading, transportation, unloading, and
installation to prevent damage to the pipes or fittings. All pipe shall
be carefully examined before installing and no piece shall be installed
which does not conform to the appropriate ASTM Specification. Any
defective, damaged or unsound material shall be repaired or replaced
as directed by the Engineer.
Al] pipe shall be laid by experienced workmen with straight lines, even
grades, and all joints perfectly fitted. The pipe shall be installed with
the bell ends in the direction of laying. Drain pipes shall be installed
at a minimum slope of 0.5%. Perforated pipe shall be installed inside
the underdrain collection system with solid pipe installed at the
interface with the outlet structure.
The upstream end of each collection pipe shall be connected to a
vertical section ofnon-perforated pipe to allow for system flushing and
Page 7 Technical Specifications
July 2007

cleanout. The pipe shall be of sufficient length to extend a minimum
of 1.0 feet above the top of the mulch layer. The Contractor shall
secure the clean-out pipe in such a fashion that it remains in place
during backfill of planting media. The top of the clean-out pipe shall
be fitted with a removable but secure cap. All pipe joints and end caps
shall be securely taped in place to avoid separation during backfilling.
Care shall be taken to avoid damage to drain pipes, riser, or outlet
barrel during construction of underdrain collection system. All foreign
matter or dirt shall be removed from the interior and ends of the pipe
and accessories before it is placed into the trench. Backfilling of
aggregate around pipe shall be performed by hand in layers not to
exceed 3 inches. Aggregate shall be placed uniformly and
simultaneously on both sides of the pipe so as to insure adequate
lateral and vertical stability of the installed pipe during subsequent
embedment and backfill operations. In no case will impact or
unbalanced deposits of aggregate materials be allowed.
Upon completion of pipe installation and trench backfilling with
aggregate the fabric shall be tightly closed over the trench. Overlaps
shall be made along the top and ends of the trench such that at no
point along the underdrain collection system does aggregate come in
direct contact with the surrounding soils or the bioretention medium.
Additional fabric shall be used as necessary or as directed by the
Engineer.
In the event that pipe or other installed work is displaced or damaged
during the construction of the underdrain system, the materials shall be
removed and the pipe or work repositioned or replaced prior to
reconstruction. Reconstruction shall be performed at the Contractor's
expense.
7.8 SUBMITTALS
For review the Contractor shall submit data for the following items
specified in this Section if requested:
1. Trade names and manufacturer's data for proprietary items.
2. Certificates of conformance of all pre-cast concrete structures.
3. Certificates of conformance of corrugated plastic pipe.
SECTION 8 - BIORETENTION AREA PLANTING
8.1 SECTION INCLUDES
Provide all necessary equipment and labor to implement planting plan.
8.2 MEASUREMENT AND PAYMENT
See SPECIAL CONTRACT PROVISIONS if applicable.
8.3 REFERENCES
The following Specifications and methods form a part of this
specification:
NCDOT -Standard Specifications for Roads and Structures.
15 NCAC 2B.200 -Classification of Water Quality Standards
Applicable to Surface Waters & Wetlands of North Carolina
The Baily Hortorium (1976 MacMillan Publishing Co., Inc.)
American Standard for Nursery Stock, latest edition
NCDENR -Erosion and Sediment Control Planning and Design
Manual
When the Specifications or Drawings differ from the requirements of
the above-referenced documents, the more stringent requirements shall
apply.
8.4 GENERAL
All plants shall be as called for by theses Specifications. Botanical
names referred to in the plans are taken from "Hortus Third", the Baily
Hortorium (1976 MacMillan Publishing Co., Inc.). All plants
delivered shall be true to name. Each plant, or group of the same
species, variety, and size of plant, shall be legibly tagged with the
name and size of the plant. All plants shall be first-class
representatives of their species.
END OF SECTION All plants shall be free from plant diseases and insect pests. All
shipments of plants shall comply with all nursery inspection and plant
quarantine regulations of the states of origin and destination, as well as
with Federal regulations governing interstate movement of stock. If
stock from other states is used, the stock shall be accompanied by a tag
or certificate stating, in effect, that the stock has been inspected and
certified by an authorized official of the state of origin as apparently
free from injurious plant pests.
All plants shall be subject to inspection at any time by the Engineer.
Any such inspection before or during planting operations, however
shall not be construed as final acceptance of the plants involved.
8.5 PLANT SUBSTITUTION
No change in the specified plants (species, variety, size, caliper, etc.)
will be made without written approval of the Engineer. All requests
by the Contractor for substitutions shall be presented in writing and
shall include a listing of the sources which have been contacted in an
attempt to secure the specified plant material. Requests for
substitutions shall include botanical name, common name, size,
caliper, and furnish description of the proposed substitute. No
S&EC Project No. 10409.D1 Page 8 Technical Specifications
Middle Creek Commons Stormwater Bioretention Area July 2007 '

increase in compensation will be made to the Contractor as a result of
the use of the approved substitute plants.
8.6 PLANTING PREPARATION
Along the outside rim of the bioretention area, preparation for planting
operations shall be as described in SECTION 10 (Sediment & Erosion
Control) of these Specifications.
Where perimeter plants shall be planted through Slope Protection
Matting, holes shall be made by neatly punching a hole in the matting.
The dimensions of the hole shall not exceed more than 2" greater than
the pot or root ball diameter in any direction, taking care not to
damage the surrounding matting.
8.7 CONTAINER GROWN PLANTS
Container grown plants if desired for use by the Contractor shall be
healthy, vigorous, well-rooted, and shall have become established in
the container in which they are delivered. These plants shall have
been in the established container long enough for the fibrous roots to
have developed so that the root mass will retain its shape and hold
together when removed from the container. The container shall be of
the size shown on the Drawings or larger, suff ciently rigid to firmly
hold the soil protecting the root during transporting, handling, and
planting, and the soil shall not be allowed to become frozen.
8.8 BALL & BURLAP PLANTS
Contractor shall be responsible for furnishing, installing, and
maintaining ball and burlap (B&B) trees as shown on the plans and in
locations as directed by the Engineer. Work includes providing all
materials necessary to prepare plant bed and install B & B trees.
The planting stock for B & B trees should be grown by nurseries
within 200 miles of the project site. Plant stock may be obtained from
nurseries beyond the 200-mile limit with the approval of the Planting
Plan Designer. All B & B trees shall have a 2.5-inch minimum caliper
stem and show no signs of recent stress.
8.9 PLANT INSTALLATION
No planting shall be done when the temperature is below 32oF, when
soil to be excavated for the plant hole is frozen, when the sides or
bottom of the plant hole are frozen, or when the soil to be used for
backfilling is frozen or too wet. In digging, loading, transporting,
unloading, planting, or otherwise handling plants, the Contractor shall
exercise utmost care and use adequate precautions to prevent injury to
or drying out of the trunk, branches, or roots as well as prevent
freezing of the plant roots.
. The planting hole shall be deep and wide enough to permit roots to
spread out and down without J-rooting and be at least two times the
diameter of the rootball taking care not to plant the tree too deeply.
' The rootball shall be placed on solid soil and not loose backfill.
Planting medium shall be replaced around the tree and lightly tamped
to eliminate air pockets. The plant stem should be upright upon
completion of installation. Trees over five feet tall will require
staking.
8.10 PLANTING PERIODS
The installation of plant material shall be performed in mid to late fall,
between October 15 and March 15 (best planting period February 1 to
March 1) to allow plants to stabilize during the dormant period and set
root during the spring.
8.11 SUBMITTALS
Contractor shall submit purchase certificates including quantities, size,
species, supplier and supplier locale (or other proof') of all species
planted to the Engineer.
END OF SECTION
S&EC Project No. 10409.D1 Page 9 Technical Specifications
' Middle Creek Commons Stormwater Bioretention Area July 2007

SECTION 9 -PERMANENT SEEDING
9.1 SECTION INCLUDES
Permanent seeding for permanent site stabilization.
9.2 MEASUREMENT AND PAYMENT
See SPECIAL CONTRACT PROVISIONS if applicable.
9.3 REFERENCES
The following Specifications and methods form a part of this
specification:
NCDENR -Erosion and Sediment Control Planning and Design
Manual
When the Specifications or Drawings differ from the requirements of
the above-referenced documents, the more stringent requirements shall
apply.
9.4 GENERAL
Permanent seeding shall be executed in temporary lined areas and all
other areas which are disturbed during construction activities. In areas
where erosion control matting will be installed, seedbed preparation
and seeding shall be performed prior to the placement of erosion
control matting (See SECTION 10 -Sediment & Erosion Control).
9.5 SEEDBED PREPARATION
Complete grading before topsoiling or preparing seedbeds. Avoid
creating steep slopes. Excess stockpiled topsoil not used in
construction shall be redistributed across areas to be seeded. Where
topsoil is unavailable, seedbeds may be prepared directly on the
exposed finished grade or topsoil maybe imported. Topsoil shall not
be distributed over planting media or surface mulch layer.
If topsoil is used, it should be spread to a uniform depth of four to six
inches and bonded to the subsoil by loosening with a disc, harrow, or
chisel plow. Areas where seeding will occur on exposed finished
grade shall be disked or harrowed to ensure soil aeration and to
increase the surface roughness prior to planting.
Apply lime and fertilizer evenly across seedbed and work into the top
4-6 inches of soil by discing or other suitable means. Operate
machinery on the contour.
Rework the surface if soil becomes compacted or crusted prior to
seeding. Complete seedbed preparation by breaking up large clods
and raking into a smooth, uniform surface. Fill in or level depressions
that can collect water.
9.6 SEEDING
Apply permanent seeding to seedbed after preparation is complete.
Use certified seed for permanent seeding whenever possible. Certified
seed is inspected by the North Carolina Crop Improvement
Association. It meets published North Carolina Standards and should
bear an official "Certified Seed" label. Broadcast seed into a freshly
loosened seedbed that has not been settled by rainfall. Mulch must be
used on all exposed areas with special attention paid to slopes 4H:1 V
or steeper and in areas when concentrated water may flow. Anchor
mulch with netting in areas subject to concentrated flow.
9.7 SEEDING DATES
Seeding dates given in these seeding Specifications have the best
probability of success.
Best Possible
Late winter 15 Feb-15 Mar 1 Dec-15 Mar
Seeding shall be completed within the "possible" range of dates unless
otherwise approved by the Engineer. Approval of the application of
Permanent Seeding measures outside of the desired date does not
relieve the Contractor of responsibility for ensuring vigorous growth
as described in Section 11.
9.8 SOIL AMENDMENTS
Apply lime and fertilizer according to soil tests, or apply 1 tons/acre
(2,000 lb/acre) ground agricultural limestone and 750 lb/acre 10-10-10
fertilizer.
9.9 MULCH
Apply grain straw, or equivalent cover of another suitable mulching
material as described above and as approved by the Engineer. Anchor
mulch by roving or netting.
END OF SECTION
S&EC Project No. 10409.D1 Page 10 Technical Specifications
Middle Creek Commons Stormwater Bioretention Area July 2007 '

SECTION 10 -SEDIMENT AND EROSION CONTROL
10.1 SECTION INCLUDES
Installation of temporary sediment and erosion control measures to
include installation of silt fence, erosion control matting, and
temporary seeding measures. The Contractor shall maintain these
measures to ensure proper structure function and vigorous temporary
vegetative cover during construction.
10.2 MEASUREMENT AND PAYMENT
See SPECIAL CONTRACT PROVISIONS if applicable.
10.3 REFERENCES
The following Specifications and methods form a part of this
specification:
NCDOT -Standard Specifications for Roads and Structures
ASTM C88 -Standard Test Method for Soundness of Aggregates by
Use of Sodium Sulfate or Magnesium Sulfate
ASTM C 127 -Standard Test Method for Specific Gravity and
Absorption of Coarse Aggregate
ASTM D698-78 -Moisture Density Relationships of Soils
ASTM D3776 -Standard Test Methods for Mass Per Unit Area
(Weight) of Woven Fabric
ASTM D4355 -Standard Test Method for Deterioration of Geotextiles
from Exposure to Ultraviolet Light and Water (Xenon-Arc Type
Apparatus)
ASTM D4491 -Standard Test Methods for Water Permeability of
Geotextiles by Permittivity
ASTM D4632 -Standard Test Method for Grab Breaking Load and
Elongation of Geotextiles
ASTM D4751 -Standard Test Method for Determining Apparent
Opening Size of a Geotextile
ASTM D4833 -Standard Test Method for Index Puncture Resistance
of Geotextiles, Geomembranes, and Related Products
U.S. Federal Highway Administration (FHWA) and U.S. Bureau of
Reclamation (USBR) Report, FHW-RD-89-199, Hydraulic Stability of
Articulated Concrete Block Revetment Systems During Overtopping
Flow
NCDENR -Erosion and Sediment Control Planning and Design
Manual
When the Specifications or Drawings differ from the requirements of
the above-referenced documents, the more stringent requirements shall
apply.
10.4 MATERIALS
Materials include silt fence, excelsor netting, and wire staples.
Silt Fence: Silt fence shall have steel posts, woven wire fabric, and
filter fabric. The steel post shall have a minimum length of 5' and
minimum width of 1 '/<". The steel posts shall have projections for
fastening the wire to the fence. The woven wire fabric shall be at lest
32 inches high, and shall have at least 6 horizontal wires. Vertical
wires shall be spaced a maximum of 12 inches apart. The top and
bottom wires shall be at least 10 gauge. All other wires shall be at
least 12%: gauge. The silt fence filter fabric shall meet the following
minimum criteria:
Grab Tensile Strength 100 lbs.
Grab Tensile Elongation 15
UV Resistance 70
Apparent Opening Size (AOS) 20 (US Sieve)
Excelsior Matting: Matting for erosion control in areas other than
streambanks with slopes graded greater than or equal to 3H:1 V shall
be excelsior matting. Excelsior matting shall consist of a machine
produced mat of curled wood excelsior a minimum of 47 inches in
width. The mat shall weigh 0.975 pounds per square yard with a
tolerance of plus or minus I O percent. At least 80 percent of the
individual excelsior fibers shall be 6 inches or more in length. The
excelsior fibers shall be evenly distributed over the entire area of the
blanket. One side of the excelsior matting shall be covered with an
extruded plastic mesh. The mesh size for the plastic shall be a
maximum of 1" x 1"square. Matting for erosion control shall not be
dyed, bleached, or otherwise treated in a manner that will result in
toxicity to vegetation. Other acceptable material manufactured
especially for erosion control may be used when approved by the
Engineer in writing before being used.
Wire Staples: Shall be machine made of No. 11 gage (0.091 "
diameter) new carbon steel wire formed into a "U" shape. The size
when formed shall be 18" in length with a throat of not less than 1 " in
width.
10.5 S[LT FENCE
The Contractor shall provide all labor, materials, tools and other items
necessary to furnish and install the silt fence as required during
construction and specified herein. The silt fence shall be placed
following the contours as closely as possible. The ends of the silt
fence shall be turned uphill.
The posts shall not exceed a spacing of 8 feet. The posts shall be
driven into the ground and shall extend above ground as shown on the
plans. The filter fabric shall be stapled or wired to each post. The
filter fabric shall extend into the ground as shown in the plans.
If possible, the filter fabric shall be cut from a continuous roll to avoid
the use of joints. When joints are necessary, securely fasten the filter
cloth only at a support with an overlap of not less than 8 feet to the
next post.
Silt fences shall be inspected weekly and after each significant storm
(0.5 inch in 24 hrs.). Any required repairs shall be made immediately.
Sediment shall be removed when it reaches 1!3 height of the fence or 9
inches maximum. Dispose of the sediment in the designated disposal
area.
S&EC Project No. 10409.D1 Page 11
1 Middle Creek Commons Stormwater Bioretention Area
Technical Specifications
July 2007

10.6 INSTALLATION OF EROSION CONTROL MATTING
Erosion control matting shall be used or all slopes steeper than 3H:1 V
unless otherwise approved by the Engineer.
Grade area to be lined. Surface shall be free of obstructions, debris,
and pockets of soft or low density material.
Cover area with stockpiled topsoil to a depth of not less than 4 inches.
Final grade with topsoil shall be as shown on Drawings. Topsoil shall
be prepared with fertilizer and lime, and seeded as described in
Section 9 (Permanent Seeding) of these Specifications.
Install excelsior matting perpendicular to slope. Matting shall be
unrolled with netting material on top and blanket material in contact
with the soil. (Note: some excelsior matting has netting on both
sides.) The matting shall be laid smooth and free from tension, stress,
folds, wrinkles or creases. Horizontal overlaps shall be a minimum of
12 inches with the upper matting overlapping the lower matting.
Vertical overlaps in matting shall be a minimum of 12 inches.
The top and bottom edges of the matting shall be anchored in trench at
least 12 inches deep as shown on plans to prevent undercutting of the
matting. Matting trench and wire staples shall be constructed and
installed as shown on Drawings.
Wire staples shall be installed not more than 3 feet apart (3' on centers)
and staggered, with a minimum of 3 staples per square yard of matting
over the entire lined area. Staples shall be driven perpendicular to the
soil surface. Staples shall be driven flush with soil surface to reduce
potential for movement of the erosion control matting. Staples shall
be installed in parallel rows on 3' centers and in trenches at the top and
bottom of the slope as shown on Drawings.
Along all laps (both vertical and horizontal) in the matting, install a
common row of staples at the seam, installing staples on 1' (12")
centers. All staples shall be driven so that the throat of the staple is
perpendicular to the axis of the stream as shown in plans. Staples
shall be driven in with a wooden mallet. Care shall be taken to avoid
damage to matting material.
Contractor shall provide all labor, materials, tools and other items
necessary to furnish and install the excelsior matting as shown on the
Drawings and specified herein.
The matting shall be laid smooth and free from tension, stress, folds,
wrinkles or creases. When matting material is unrolled, netting
material should be on top with blanket material in contact with the
soil. (Note: Some excelsior matting has netting on both sides.)
Horizontal overlaps shall be a minimum of 12 inches with the upper
matting overlapping the lower matting. Vertical overlaps in matting
shall be a minimum of 12 inches with the upstream matting
overlapping the downstream matting.
In the event that the matting is displaced or damaged during
installation, the matting shall be repositioned or replaced. This will be
done at no additional cost to the Owner
10.7 TEMPORARY SEEDING
The Contractor shall provide all labor, materials, tools, and other items
necessary to provide temporary seeding in accordance with State and
local standards.
Areas where no substantial or significant progress is made for more
than 15 days shall be temporarily seeded as shown on the Drawings
and specified herein. All areas must be seeded, mulched, and
anchored unless written approval is granted by the Owner. Incidental
grading shall not constitute substantial or significant progress in
construction activity. Seeding and mulching shall be done
immediately following construction.
Grass seed shall be applied at the following rate:
Type Dates Possible Rate
German Millet May 1-Aug IS 401bs./ac.
Rye (Grain) Aug. 15 -May 1 601bs./ac.
Follow recommendations of soil tests or apply 2,000 lbs/acre ground
agricultural limestone and 750 lbs/acre 10-10-10 fertilizer. Straw
mulch shall be applied to all disturbed areas after seeding. Mulching
shall consist of small grain straw applied a rate of 70 pounds per 1000
square feet (701bs./1000sq.ft.).
If permanent and temporary seeding is performed at the same time,
only use soil amendments as described in Section 9 of these
Specifications.
END OF SECTION
S&EC Project No. 10409.D1 Page 12 Technical Specifications
Middle Creek Commons Stormwater Bioretention Area July 2007

SECTION 11 -SITE MAINTENANCE
11.1 SECTION INCLUDES
Site maintenance to ensure vigorous vegetative cover, stable slope
lining, general plant survivability and durability of the work.
11.2 MEASUREMENT AND PAYMENT
See SPECIAL CONTRACT PROVISIONS if applicable.
11.3 EXECUTION
Contractor shall revisit the site as required in the special contract
provisions to inspect the condition of the project site. Areas of
erosion, settlement, poor vegetative cover, and displaced excelsior
materials or structures, and dead or dying trees or shrubs shall be
repaired. Site visits shall be coordinated with Owner.
Eroded areas shall be filled and reseeded in accordance with Section 9
- Permanent Seeding. Areas of poor vegetative cover shall be reseeded
and refertilized only.
Displaced, damaged, or dead tree and shrub species shall be removed,
and replanted in accordance with Sections 8 -Bioretention Area
Planting.
END OF SECTION
S&EC Project No. 10409.D1 Page 13 Technical Specifications
Middle Creek Commons Stormwater Bioretention Area July 2007

F~ pl-/dal
DESIGN CALCULATIONS
MIDDLE CREEK COMMONS
BIORETENTION AREA
DESIGN
JOHNSTON COUNTY, NORTH CAROLINA
Prepared for:
MIDDLE CREEK COMMONS, LLC
Raleigh, NC 27605
JULY 2007
S&EC Project No. 10409.D1
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`:
ti~A`,-~~ Patrick K. Smith, .E.`~,~ ~ c3 0~:
_ _' ,'~,~~~ 3;~ ''~;:ajNC License No. 25525 8!A@8{008{{{000!
Soil & Environmental Consultants, PA
11010 Raven Ridge Road Raleigh, North Carolina 27614 Phone: [phone] Fax: [phone]
www.SandEC.com

Soil & Environmental Consultants, PA , S&EC Project No 10409.D1
Middle Creek Commons July 2007
' Project Location
' The project is located in Johnston County, NC. The property is owned by Middle Creek
Commons, LLC and consists of approximately 13.9 acres located at the southwest corner
of NC Highway 42 and NC Highway 50. See Figures 1 and 2.
' Stormwater Treatment
' Treatment of Stormwater runoff has been required by the Division of Water Quality
(DWQ) and Johnston County as part of the project's permitting requirements.
' The original Stormwater management plan for the development was designed by Chas H.
Sells, Inc. and called for all site stormwater to be treated in a single Extended Detention
Stormwater Wetland. However, it was determined after the construction of the
t Stormwater Wetland that portions of two outparcels had not been included in the design
calculations. The total acreage that was not accounted for in the original design was
' approximately 0.5 acres.
A review of the asbuilt dimension of the Stormwater wetland showed that it would not
sufficiently treat the additiona10.5 acres of impervious area. To rectify this, a single
' onsite Bioretention Area (BRA) is proposed. The proposed bioretention area has been
sized to treat 0.5 acres of impervious area m accordance with the 2007 DWQ Stormwater
' BMP Manual.
Total Suspended Solids (TSS) and Total Nitrogen (TN) Removal
' The BMP manual outlines design requirements necessary to meet the pollutant removal
design standard of 85 percent removal of Total Suspended Solids (TSS). Based on the
BMP manual, a bioretention area is assumed to have a TSS removal efficiency of 85
' percent. Sized appropriately, a bioretention area will meet the removal requirements for
the impervious areas not accounted for in the original Stormwater management plan.
' l
f
o
Constructed properly, bioretention areas also contribute significantly to the remova
Total Nitrogen (TN). According to the BMP Stormwater Manual from the N.C. Division
' of Water Quality (DWQ), dated July 2, 2007 bioretention areas are currently considered
to remove 35 percent of the TN from Stormwater inflow.
' Bioretention Area Planning & Design
Calculations for the sizing of the total footprint of the BRA were performed by Soil &
' Environmental Consultants, PA (S&EC). All necessary stormwater design calculations
and supporting documentation are attached.
' From available site topographic data and grading plans provided by Chas H. Sells, Inc.,
the BRA was sized to treat stormwater runoff from 0.5 acres of adjacent parking lot.

1 Using the methods described in the BMP Manual, we determined the required surface
' 1 of 3

Soil & Environmental Consultants, PA
Middle Creek Commons
S&EC Project No 10409.D1
July 2007
area for the BRA needed to treat this runoff. Design of the BRA included inflow
distribution, treatment soil characteristics, ponding depth, underdrain sizing and features,
and outlet structure sizing and features.

The total area draining to the BRA is approximately 0.5 acres (adjacent parking lot).
However, because there is a roadside swale immediately north of this BRA (situated
between NC Highway 42 and the BRA), and this Swale is at an elevation higher than the
BRA, the overflow weir has been sized to convey the drainage area to the roadside swale
(during a 100-year event) as well. With this additional impervious area (0.63 acres), the
total drainage area consists of approximately 1.13 acres. While this design approach is
conservative, we felt it was appropriate based on site conditions.
For the purpose of our design, we have assumed that the receiving storm sewer network
was sized to convey discharge from the entire site including the previously described 0.5
acres of parking lot. The outlet barrel of the BRA will be connected to the storm sewer at
anew junction box to be designed by others.
Proper planting of the BRA will allow this area to be integrated into the site landscaping
plan to provide the necessary treatment function and the desired appearance.
The following table provides a summary of our design results:
TotalImpervious Weighted Required Proposed
Area Rational Bioretention Area Bioretention Area
(sq.ft.) Coefficient (sq. ft.) (sq. ft.)
21,780 (0.5 ac) 0.95 1,914 2,325
Based on our previous discussions with the Division of Water Quality (DWQ), we
understand that once treated for TSS, stormwater from a bioretention area can be
discharged directly into the receiving watercourse. However, in this case, water will be
discharged through the riser/barrel system into an adjacent storm sewer.
2 of 3

Soil & Environmental Consultants, PA
Middle Creek Commons
List of Attachments and Figures
Attachments:
Bioretention Sizing Calculations
NCDENR Bioretention Basin Supplement Worksheet
Figures:
Figure 1 - USGS Map
Figure 2 -Soils Map
Plan Sheets:
Sheet 1 -Cover, Contents, & Vicinity Map
Sheet 2 -Overall Site Plan
Sheet 3 -Bioretention Cell Layout
Sheet 4 -Construction Sequence
Sheet 5 -Bioretention Cell Details I
Sheet 6 -Bioretention Cell Details II & Erosion Control Details
Sheet 7 -Bioretention Cell Planting Plan
Sheet 8 -Planting Schedule & Planting Details
S&EC Project No 10409.D1
July 2007
4 pages
4 pages
3 of 3

1
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1

MIDDLE CREEK COMMONS - BIORETENTION AREA SIZING CALCULATIONS
Project Number: 10409.D2
Rain Garden Sizing
1. Runoff Depth, D = [(P-0.2*S)z)/[(P+0.8*S)], in
P =Precipitation (usually 1 inch)
S = [1000/CN]-10
CN = 98
S = 0.2
P = 1 inch
D = 0.791 inch
2. Runoff Volume , VR = A*D, (ft3)
A =Impervious Area (ft2)
D =Runoff depth (in)
A = 21780 ftz sized to treat 0.5 acre (21780 ft2)
D = 0.791 in
VR = 1435.5 ft
3. Bioretention Surface Area , SA = VR/H, (ft2)
VR =Runoff volume (ft3)
H =Average depth of water, (optimal 6 inches)
VR = 1435.5 ft3
H = 9 in
SA = 1914.0 ftZ
Underdrain Sizing
1. Fill Soil Choice
Nitrogen Removal -Sandy Loam
K= 1 in/hr Soil Type: 12% Fines (Silt+Clay), 82-85% Sand, 3-6% Organic
Other Pollutant Removal -Loamy Sand
K= 2 in/hr Soil Type: 8% Fines (Silt+Clay), 86-90% Sand, 2-4% Organic
K= 1 in/hr
2. Minimum Flow, QM;~ = K " A"(1 /43200), (cfs)
Assumes ~H/L = 1.0
K =Fill soil choice (in/hr)
A =Bioretention surface area (ft2)
K = 1 in/hr
A = 1914.0 ft2
QMin = 0.0443 CfS
Page 1 of 4

' 3. Design Flow, QD - QMin * FS, (cfs)
QMin =Minimum flow, (cfs)
' FS =Factor of safety (range between 2 and 10)
QMin = 0.0443 CfS
' FS = 2
Qp = 0.0886 cfs
' 4. Pipe Diameter, d = 16"[(Qo*n)/so.s~~sia~ (in)
Qp =Design flow, (cfs)
' n = Manning's roughness coefficient
s =internal slope (recommended minumum 0.005 ft/ft)
' Qp = 0.0886 cfs
n = 0.011 for smooth wall
s = 0.005 ft/ft
d = 3.21 inches
use d = 4.0 inches
5. Number of Pipes
Equivalent Pipe Diameters
D (in) No. of 4" diam
' 5.13 2
5.95 3
6.66 4
' 7.22 5
7.75 6
8.2 7
' d = 4.00 inches
# of 4"diameter pipes = 2
' Equivalent Pipe Diameters
D (in) No of 6" diam
' 7.84 2
9.11 3
10.13 4
' # of 6" diameter pipes = N/A
Calculating Drawdown
1. Ponded Volume, VP =Runoff Volume, VR
' VP = 1435.5 ft
Page 2 of 4

2. Time to Drain Ponding Zone , Tp = Vp / QMim (hr)
Vp = Ponded volume, (ft3)
QMin =Minimum flow, (cfs)
3
Vp = 1435.5 ft
QMin = 0.0443 Cfs
Tp= 32400 seconds
1
1
1
1
1

Tp = 9.00 hours
3. Volume in Top 24", Surface Volume , Vs = SA*n*2 (ft3)
SA =Surface area, (ft2)
n =Soil drainable porosity (range between 0.25 and 0.50)
SA = 1914.0 ftZ
n = 0.45
Vs = 1722.6 ft3
4 Time to Drain Soil Zone , Ts = Vs /QMin (hr)
Vs =Volume in top 24", (ft3)
QMin =Minimum flow, (cfs)
3
Vs = 1722.6 ft
QMin = 0.0443 CfS
Ts = 38880 seconds
Ts = 10.80 hours
5. Total Drawdown Time , Ttotai = Tp + Ts, (hr)
Tp =Time to drain ponding zone, (hr)
Ts =Time to drain soil zone (hr)
Tp = 9.00 hours
Ts = 10.80 hours
Ttotai = 19.80 hours
Sizing Overflow Weir
1. 100-near flow, Q~oo = C"i~oo"A, (cfs)
C =Rational Coefficient (range between 0 and 1)
i~oo = 100-year intensity, from IDF table, (in/hr)
A =Drainage area, (ft2)
C = 0.950
itoo = 9.6 in/hr
A = 1.13 acres
Quo = 10.34 cfs
Page 3 of 4

1
1
1
1
1
1
1

1
1
1
1
2. Length of Weir, Lweir - Q100 / I~'W*H1.5]
Qioo = 100-year flow, (cfs)
Lweir =Weir coefficient
H =Height of water above weir, typically 2 (in) if parking lot median
Q~oo = 10.34 cfs
Lweir = 3 for sharp-crested
H = 6 in
Lweir = 9.74 feet
3. Outlet Size
1 side square outlet =Weir Length / 4
Lweir = 9.74 feet
Lweir = 116.93 inches
1 side = 29.23 inches
Square Dimensions:
29.23 x 29.23 inches
use 30 x 30 inches or larger
Sizing Outflow Pipe
1. Outflow Pipe Diameter, Dfuii = 16*[(Q~oo''n)/Js]~3~8~, (ft)
Qioo = 100-year flow, (cfs)
n = Manning's roughness coefficient
s =internal slope (recommended minumum 0.5%)
Q~oo = 10.34 cfs
n = 0.011 for smooth wall
s = 2.00%
Dfuu = 14.74 inches
use 18 inches
Page 4 of 4

' Permit No. O~0- ~ ~Z~
(to be provided by DWQ)
' State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
BIORETENTION BASIN SUPPLEMENT
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, a
bioretention area supplement for each proposed system, sealed design calculations, a detailed soils report and 2 sets
of plans and specifications showing all Stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name : 1`l1rc~~2. CV~~ Cdr'Y1~MG~` S~C~t~I.vCL~'~- ~,~C~-~.c~cri Pc(~et
Contact Person: 1~.bZCCR S• C_,~o~`r'aG . ~• ~ • Phone Number: (~~`i) ~4to °S°~ GC eX'c• Z~
For projects with multiple basins, specify which basin this worksheet applies to:
(must match the DA # on the application & plans)
II. DESIGN INFORMATION Attach supporting calculations/documentation. Provide a written soils report
based on actual field investigations conducted by a qualified individual. The soils report should include
informational references to the County soils maps when available. All elevations shall be in feet mean sea level
(fmsl).
Soils Report Summary
In-Situ Soil Type
In-Situ Soil Infiltration Rate
SHWT Elevation
Planting Soil Texture
Planting Soil Infiltration Rate
Basin Design Parameters
Drainage Area
Impervious Area
Design Storm
Design Volume
Inlet Velocity
Drawdown Time
^ Basin Elevations
Temporary Pool Elevation
' Planting Elevation
Bottom Elevation
' Basin Dimensions
Basin Size
Basin Volume Provided
SWU-108 4.07
I , ~ in./hr. (the most restrictive soil layer) sch~5~ ~~, ; A~`~ `~ °-°~'`~'"~'~ `~i
'-= ~ • ~! ft. (Seasonal High Water Table elevation) ++
SG ~~~! m ~ ~ (must be a sandy loam, loamy sand, or loam texture)
. 0 O.Y~n
r ,
~ CSC S~{}•rw'v'~~ s,,V G:.~E'_w' `1~~.~< -~ +: ^~ `<;~ ~ ` fa ~ 't:° `~..~ ~ ~~ ~'~e" a
a.„ F
2t~ `6th sq.ft. (on-site and off-site drainage to the basin) (`~`13~y ~~Z n~ v`=a~'- ~''
Z1~-~ c~ sq.ft. (on-site and off-site drainage to the basin) ~ St ve- C=e\tQ ~"•~-1 C~u'-1~}
I . (~ inch (I.S inch event for SA waters, 1 inch event for others)
1~ c.f. (storage volume reguirecl) F t' `t ` r z * `~' '~',
V
2,0 fps ~• ; .~ ... ' ~ : t~~ 'v. ~ ..~, ~~°t
~3 ~,~ .
la •`b hours AEI G `d ZO0%
`7Ci~:k' - e°d:~'I t'r; f 1r,?i1Li"1'~'
°~Ct7.'~-~ fmsl (elevation of the bypass/outlet structure) Q~FTi h ~~ ~ .t'? `, i"r"~'1~1'~ ;,? (if"tA~~ii-9
30~~ fmsl (elevation of the ground surface bottom)
30~ fmsl (elevation of the bottom of the planting media)
I~~ ft. x 15 ft. = Z~sq. ft. (surface area at basin bottom)
Page 1 of 4

Basin Plantings
' Number of plantings required
Total No. of plantings provided
1$ stems (400 stems per acre of bioretention area is required at a minimum)
1`~ =Trees fl + Shrubs IY; (at least 1 tree for every 3 shrubs)
This system (check one) does does not incorporate the use of an under-drain.
(Under-drains are not allowed for those projects that drain to class SA waters.)
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Stormwater Best Management Practice
Manual and Administrative Code Section: 15A NCAC 2H .1000. These requirements are subject to change in
accordance with the manual and rules.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach written justification. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and
approval of the project.
Applicant's Initials
/`s~ ~ a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
~~' ~
~,~) b. No vertical sand bed is proposed.
~ (.,
1~' I c. The bioretention area is at least 15 feet wide by 40 feet long.
~'~ _ ~
~~' d. A grass buffer strip and sheet flow conditions are provided at the inlet.
r ~
~~-/~ e. Seasonal High Water table depth is at least 2 feet below the planting elevation surface.
~~ ~ f. Ponding depth of 6-12" is provided.
~a! ~
~,
'~' g. In-situ soils have a minimum hydraulic conductivity of 0.52 inches per hour.
1 ~~~:] h. An in-depth soils report is provided. (report should include soil types, boring log, map,
suitability for placement of the control system, seasonal high water table, infiltration rate, etc.)
i. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour. The type and
~~
placement specifications of the planting media are noted on the plans.
,~~•it
~f-- I j. The planting soil meets minimum soil specifications per the latest version of the NCDENR
Stormwater Best Management Practices Manual, including a low phosphorus content to
promote phosphorus removal. (P-Index of 20 to 40 is optimal.) Include a soils test, indicating
P-Index, from a certified lab for those projects draining to Nutrient Sensitive Waters.
~, (` 1~1v~rE.: NC©WC~ 5-1-~~-~~vc~k-~'.+r ~~^,.~~ ~,rycti~-o~ac~..!~ , ~~~~ LGc'~ e~~res c~Ci~n~,,l
`~` ~t- i k. System is designed to draw down the design storage volume to the proposed bottom elevation
,±
under seasonal high water conditions within 24 hours. Draw down calculations are attached.
~~~g~~) 1. A detailed planting plan, prepared by a qualified individual, is provided on the plans. This, plan
shall indicate a variety of suitable species, location, spacing, soil preparation, fertilizer
requirements, installation procedures, construction schedule, etc..
SWU-108 4.07
' Page 2 of 4

~ ~. ~~
~' ~~-~ m. Type of mulch layer and depth is specified on the plans.
~' `'fry' t`.
' ~ ~~ n. Plan and section details for the bioretention area are provided. (including dimensions and
elevations)
r~
' ~ ~~~ o. Plan details for the inlet and outlet structures are provided. (including dimensions and
elevations)
4-~~ p. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
~"") ~ ~.,
~' ~~-' e q. A benchmark is provided to deterrrune the sediment accumulation m the basin area.
' n ~ r. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
length is 50 feet for SA waters, 30 feet for other waters).
r,; ~ , ~,` I~lc~' ®v}~4cUa cc~'n~CC~-e.~ -lro s-1-o~m d~~C'~0.~e. ~'yS-~t'~'i.
' ~' (~' ~~' s. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
~~~ t. Plans ensure that the installed system will meet design specifications (constructed or restored)
' upon initial operation once the project is complete and the entire drainage area is stabilized.
' IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Records of maintenance items to include dates, inspector's name, type of maintenance, etc. shall be kept and made
available to Division staff upon request. Maintenance activities shall be performed as follows:
1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after
every significant runoff producing rainfall event and at least monthly. Remove trash as needed.
2. Repair eroded areas immediately, re-seed, re-plant, and re-mulch as necessary to maintain good vegetative and
' mulch cover.
3. Remove accumulated sediment as needed to maintain good infiltration. When the filtering capacity diminishes
' substantially (e.g., when water ponds on the surface for more than 24 hours), the top few inches of material must
be removed and replaced with fresh planting soil material. Regardless of infiltration capacity, accumulated
sediment in the bioretention basin shall be removed when the depth is reduced to 75% of the original design
depth. The system shall be restored to the original design depth without over-excavating. Over-excavating may
cause the required water table separation to be reduced and may compromise the ability of the system to perform
as designed. 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 stormwater treatment device or stream,
etc.).
4. Replace, or add additional mulch as needed. Removal of the old mulch layer before applying the new layer is
' recommended every 2 to 3 years.
5. Prune trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in
height.
6. Treat all diseased trees and shrubs whenever needed. Remove and replace all dead and diseased vegetation
considered beyond treatment every 6 months.
7. Replace support stakes yearly (in the spring). Replace deficient stakes or wires whenever needed.
SWU-108 4.07
' Page 3 of 4

' $. Soil testanb shall be conducted annually to determine pH and any accumulation of toxins in the planting media.
Lime or other alkaline substances :;hall be applied as recommended per the soil test and toxic soils shall be
removed, disposed of properly and replaced with new planting media.
' 9. All components of the bioretention area system shall. be maintained in good working order.
10. If the; Division determines that the system is failing, the system will immediately be repaired to original design
' specifications. 1f the systerrt eann~~t be repaired to perform its design function, other stormwater control devices
as allowed by NCAC 2H .1000 nntist be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the ten 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: --~L~ /~ /Q/q IS
Title: /Z c7 TEG7 /~/aiY.9GFR
Address: o? 0 hk l GAS dF. ~ G~{~ /I/C' o?760s
Phone
Signa~
Date:
Note: The lep,ally responriblc partp should not be a homeowners association unless morn [hen 50% of the lots have been sold and ;i
resi~de1t of the subd/ivision has been named the president. ,~ l ,A /~
1, /'~ % r~ ~~ /`' ~~ ~ ~ , a Notary .Public for the State o'F /~/ ~ /~'/~ L1c /o ~%I~IG
County of (~Cc ~L+C , do hereby certify that /'~Sti Cr v/l S
personally appeared before me this ?S~day of ~~ ~J 2oo'I ,and acknowled~*e the
due execution of the forgoing bioretenti.on basin maintenance requirements. Witness my hand and official seal,
a< Y • 67
~~
~~~V
Nly commission expires
SWU-108 4.07
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Page 4 of 4

Report Number:
R07094-0021 A&L Eastern Laboratories, Inc.
Account Number: 7621 Whitepine Road Richmond, Virginia 23237 [phone]
45479 Fax No. [phone] Email: [e-mail]
Send To: SOIL & ENVIRONMENTAL Grower: WADE MOORE EQUIP CO INC
CONSULTANTS INC
11010 RAVEN RIDGE RD
RALEIGH, NC 27614
SOIL ANALYSIS REPORT
Page: 1 Date Received: 4/4/2007 Date of Analysis: 4/5/2007 Date of Report: 4/9/2007
Organic Matter Phosp horus Potassium Magnesium Calcium Sodium p H Acidity C.E,C.
Sample
Number Lab
Number
% ENR
Ibs/A Rate
Available
ppm Rafe
Reserve
ppm Rate
K
ppm Rate
MG
ppm Rate
CA
ppm Rat

e
NA
ppm Rate
Soii
pH
Buffer
Index
H
megNOOg

megtt00g
1 14867 4 VL
NC=3
2 14868 56 H
NC=47
3 ~' 14869 35 M
NC=29
:`

P ercent Base Saturation Nitrat e Sulfur Zinc Manganese from Copper Boron Soluble Chloride Aluminum
Sample
K
M
C
Na
H
N03-N
S04-S
ZN
MN
FE
CU
B Salts
CL
AL
Number % g
% a
% % % ppm Rate ppm Rate ppm Rate ppm Rate ppm Rate ppm Rate ppm Rate ms/cm Rate ppm Rate ppm Rate
1
2
3

Submitted By: NICOLE MACALUSO
Analytical Method(s):
- - ~ I his report applies to the sampietsf testes. samples are retained a
Values on this re ort re resent the lant available nutrients in the soil. Ex lanation of s mbols: % ercent , m arts er million , IbslA ounds er acre , maximum of thirty days after testing. Soil Analysis prepared by:
p p p P Y (P ) Pp (p p ) (p p ) A & L EASTERN LABORATORIES, INC.
Rating after each value: VL (Very Low), L (Low), M (Medium), H (High), VH (Very High). ms/cm (milli-mhos per centimeter), megl100g (milli-equivalent per 100 grams). ~ _
ENR -Estimated Nitrogen Release. C.E.C. -Cation Exchange Capacity. Conversions: ppm x 2 = IbsIA, Soluble Salts mslcm x 640 =ppm. by' ~ ~
Paul Chu, Ph.D.
r

Report Number:
R07094-0021 A&L Eastern Labortories, Inc.
Acount Number:
45479 7621 Whitepine Road Richmond, Virginia 23237 [phone]
Fax No. [phone] Email: [e-mail]
TO: SOIL & ENVIRONMENTAL
CONSULTANTS INC
11010 RAVEN RIDGE RD
RALEIGH, NC 27614
Date Received: 4/4/07 Date Reported: 04/09/2007
RE: WADE MOORE EQUIP CO INOVICOLE MACALUSO
REPORT OF ANALYSIS
Page: 1
LAB NO. SAMPLE ID
14867 1
14868 2
14869 3'
ANALYSIS RESULT UNIT METHOD
Organic Matter (LOI) 0.8 % AOAC (15th) 967.05
Sand 83 % Bouyoucos 1962
Silt 11 % Bouyoucos 1962
Clay 6 % Bouyoucos 1962
Soil Textural Class
_ Loamy Sand
_ __ Bouyoucus 1962
Organic Matter (LOI) 1.1 % AOAC (15th) 967.05
Sand 91 % Bouyoucos 1962
Silt 1 % Bouyoucos 1962
Clay 8 % Bouyoucos 1962
Soil Textural Class Sand Bouyoucus 1962
Organic Matter (LOI) 0.9 % AOAC (15th) 967.05
Sand 89 "` % Bouyoucos 1962
Silt 7 % Bouyoucos 1962
Clay 4 % Bouyoucos 1962
Soil Textural Class Sand Bouyoucus 1962
Our reports and letters are for the exclusive and confidential use of our clients, and may not be reproduced in whole or in part, nor may any reference be made ~ w~'t"~ 'a'~~
to the work, the results, or the company in any advertising, news release, or other public announcements without obtaining our prior written authorization.
Paul Chu, Ph.D.

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A
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7JNC.Highway X42;
Project Site o PaE
LO
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k IlkI
a_
McB
f
NoB
Soil types:
4 " Bb - Bibb sandy loam
GeD eIMcBt r McB - Marlboro -Cecil complex
}
m NoA Norfolk loamy sand
" ; .° NoB - Norfolk loamy sand
PaE - Pacolet loam
WaB - Wagram loamy sand
Project Number: Map Title:
' 10409. D
FI
Project Manager: Soil
2 - SOIIS Map ,
Soil & Environmental Consultants, PA
PK5 Middle Creek Commons 11010 Raven Ridge Rd.- Raleigh, NC 27614
' 46-9467
Scale: u — Johnston Count NC (We Page: w • .San EC.com
- 250' y� Web Page: www.SandEC.com
'Date: Source:
7/25/07 NCDOT � 55URGO

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