20021477 Ver 1_COMPLETE FILE_20020917

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Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
September 30, 2002
New Hanover County
DWQ Project #: 02-1477
APPROVAL OF 401Quality Certification with ADDITIONAL CONDITIONS
City of Wilmington
Attn: Jeff Nobles
Post Office Box 1810
Wilmington, NC 28402-1810
Dear Mr. Nobles:
You have our approval, in accordance with the attached conditions, to impact 514 feet of stream
for the purpose of bank stabilization at Marsden Branch drainage repair as you described in your
application dated September 3, 2002. After reviewing your application, we have decided that this fill is
covered by General Water Quality Certification Number 3353, which may be viewed on our website at
http://h2o.enr.state.nc.us/ncwetlands. This certification allows you to use General Permit Number 13
when the Corps of Engineers issues it. In addition, you should get any other federal, state or local
permits before you go ahead with your project including (but not limited to) Sediment and Erosion
Control, Coastal Stormwater, Non-Discharge and Water Supply Watershed regulations. This approval
will expire when the accompanying 404 or CAMA permit expires unless otherwise specified in the
General Certification.
This approval is only valid for the purpose and design that you described in your application
except as modified below. If you change your project, you must notify us and you may be required to
send us a new application. If the property is sold, the new owner must be given a copy of this
Certification and approval letter and is thereby responsible for complying with all conditions. If total
wetland fills for this project (now or in the future) exceed one acre, compensatory mitigation may be
required as described in 15A NCAC 211.0506 (h) (6) and (7). This approval shall expire when the
corresponding Nationwide Permit expires or as otherwise provided in the General Certification. For
this approval to be valid, you must follow the conditions listed in the attached certification and any
additional conditions listed below.
1. Upon completion of the project, the applicant shall complete and return the enclosed
"Certification of Completion Form" to notify DWQ that all the work included in the 401
Certification has been completed. The responsible party shall complete the attached form and
return it to the 401/Wetlands Unit of the Division of Water Quality.
If you do not accept any of the conditions of this certification, you may ask for an adjudicatory
hearing. You must act within 60 days of the date that you receive this letter. To ask for a hearing, send
a written petition, which conforms to Chapter 150B of the North Carolina General Statutes to the
Office of Administrative Hearings, P.O. Box 27447, Raleigh, N.C. 276 1 1-7447. This certification and
its conditions are final and binding unless you ask for a hearing.
N. C. Division of Water Quality, 401 Wetlands Certification Unit,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
[phone] (phone), 919-733-6893 (fax), (hftp://h2o.enr.state.nc.us/ncwetlands
This letter completes the review of the Division of Water Quality under Section 401 of the Clean
Water Act. If you have any questions, please telephone John Dorney at 919-733-1786 or Joanne
Steenhuis at our Wilmington Regional Office at 910-395-3900.
Sincerely,
Attachments
cc: Corps of Engineers Wilmington Field Office
Wilmington DVV'Q Regional Office
File copy
Central Files
3
City of
Wilmington
North Carolina
September 3, 2002
Mr. Todd St. John
Division of Water Quality-Wetlands Unit
1621 Mail Service Center
Raleigh, NC 27699-1621
Dear Mn St. John,
Development
Services
305 Chestnut Street
PO Box 1810
Wilmington, NC 28402-1810
r [phone] tdd
E - -_ 0214
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SEE ? 72002 ? 111? it
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ECl7CN
SUBJECT: MARSDEN BRANCH DRAINAGE REPAIR
Please find the enclosed plans, narrative, addendum, a check for $475.00 (application fee), and permit
application for the Marsden Branch Drainage Repair Project. This project is being implemented and funded
by the City of Wilmington.
As described in the narrative, disturbance of wetlands is less than 1 /10 of an acre, while impacting more than
150 linear feet of streams. We have submitted this project previously. The previous application has been
withdrawn. The project received a Nationwide Permit 13, Section 404, from the Army Corps of Engineers
for this project. The A.C.O.E. Action Id. was 200100384. The DWQ # is 010442. Per conversations with
DWQ staff, we have changed the lining of the proposed channel from a concrete block revetment system to a
turf reinforcement mat system. We are also resubmitting ari.application package to Angie Pennock of the
Army Corps of Engineers for processing. The intent of this pr'oject.is to repair and improve the drainage
way to a stable stream with consistent pattern and profile. If you have any. questions, do not hesitate to
contact me at [phone].
Sincerely,
k"A'6
Jeffrey Nobles, E.I.
Staff Engineer
Enclosures (7)
Community Development Planning Engineering Development Management
[phone] telephone [phone] telephone [phone] telephone [phone] telephone
[phone] facsimile [phone] facsimile [phone] facsimile [phone] facsimile

DWQ ID: - CORPS ACTION ID: -
SEP 172002
I .d._
NATIONWIDE PERMIT REQUESTED (PROVIDE NATIONWIDE PERMIT #) _'...? -
PRE-CONSTRUCTION NOTIFICATION APPLICATION 0 2 1 4 7 7
FOR NATIONWIDE PERMITS THAT REQUIRE:
1. NOTIFICATION TO THE CORPS OF ENGINEERS
2. APPLICATION FOR SECTION 401 CERTIFICATION
3. COORDINATION WITH THE NC DIVISION OF COASTAL MANAGEMENT
SEND THE ORIGINAL AND (1) COPY OF THIS COMPLETED FORM TO THE APPROPRIATE FIELD
OFFICE OF THE CORPS OF ENGINEERS (SEE AGENCY ADDRESSES SHEET). SEVEN (7)
COPIES MUST BE SENT TO THE NC DIVISION OF WATER QUALITY,
ATTN: JOHN DORNEY, 4401 REEDY CREEK ROAD, RALEIGH, NC
27607. PLEASE PRINT OR TYPE.
1. OWNER'S NAME: City of Wilmington (Ed Fare-Interim City Manager)
2. MAILING ADDRESS: P.O. Box 1810.305 Chestnut Street
SUBDIVISION NAME N/A
CITY: Wihnin on STATE: NC ZIP CODE: 28402-1810
PROJECT LOCATION ADDRESS, INCLUDING SUBDIVISION NAME (IF DIFFERENT FROM
MAILING ADDRESS ABOVE):
Rosemont Ave. / Anne McCrary Park
3. TELEPHONE NUMBER: (HOME) _ (WORK) [phone]
4. IF APPLICABLE: AGENT'S NAME OR RESPONSIBLE CORPORATE OFFICIAL, ADDRESS,
PHONE NUMBER:
Jeff Nobles. Engineering Dot.. P.O. Box 1810.305 Chestnut St.. Wilmington. NC 28402-1810
5. LOCATION OF WORK (PROVIDE A MAP, PREFERABLY A COPY OF USGS TOPOGRAPHIC MAP
OR AERIAL PHOTOGRAPHY WITH SCALE):
COUNTY: New Hanover - NEAREST TOWN: Wilmington
SPECIFIC LOCATION (INCLUDE ROAD NUMBERS, LANDMARKS, ECT.) Stream is located between
Rosemont Ave. and Ashley cir. (East of Rosemont). Project Starts at Winston Blvd., flows North, and ends
downstream at Randall Pond.
6. IMPACTED OR NEAREST STREAM/RIVER: Burnt Mill Creek RIVER BASIN: Cape Fear
7. (a) IS PROJECT LOCATED NEAR WATER CLASSIFIED AS TROUT, TIDAL SALTWATER, (SA),
HIGH QUALITY WATERS (HQW), OUTSTANDING RESOURCE WATERS (ORW), WATER
SUPPLY (WS-I OR WS-In? YES ? NO ® IF YES, EXPLAIN: _
(b) IS THE PROJECT LOCATED WITHIN A NORTH CAROLINA DIVISION OF COASTAL
MANAGEMENT AREA OF ENVIRONMENTAL CONCERN (AEC)? YES ? NO
(c) IF THE PROJECT IS LOCATED WITHIN A COASTAL COUNTY (SEE PAGE 7 FOR LIST OF
COASTAL -COUNTIES), WHAT IS THE LAND USE PLAN (LUP) DESIGNATION? evelo ed
8. (a) HAVE ANY SECTION 404 PERMITS BEEN PREVIOUSLY REQUESTED FOR USE ON THIS
PROJECT? YES ® NO ? IF YES, PROVIDE ACTION I.D. NUMBER OF PREVIOUS PERMIT AND
ANY ADDITIONAL INFORMATION (INCLUDE PHOTOCOPY OF 401 CERTIFICATION):
200100384 -Previous channel lining was rejected b DW . This application proposes a new lining for the
same channel cross-section
(b) ARE ADDITIONAL PERMIT REQUESTS EXPECTED FOR THIS PROPERTY IN THE FUTURE?
YES ? NO ® IF YES, DESCRIBE ANTICIPATED WORK:
(a) ESTIMATED TOTAL NUMBERS OF ACRES IN TRACT OF LAND: 0.50
(b) ESTIMATED TOTAL NUMBER OF ACRES OF WETLANDS LOCATED ON PROJECT SITE:
0.04
10. (a) NUMBER OF ACRES OF WETLANDS IMPACTED BY THE PROPOSED PROJECT BY:
FILLING:.014 EXCAVATION: 0.029
FLOODING: OTHER :
DRAINAGE_ _ TOTAL ACRES TO BE RAPACTED: 0.043 (assumed 3' wide bottom continuously
submerged for length of stream)
(b) (1) STREAM CHANNEL TO BE IMPACTED BY THE PROPOSED PROJECT (IF RELOCATED,
PROVIDE DISTANCE BOTH BEFORE AND AFTER RELOCATION:
LENGTH BEFORE: 514 FT AFTER: 403 FT
WIDTH BEFORE (based on normal high water contours): _ FT
AVERAGE DEPTH BEFORE: 3 FT AFTER: 5 FT
(b) (2) STREAM CHANNEL IMPACTS WILL, RESULT FROM: (CHECK ALL THAT APPLY)
OPEN CHANNEL RELOCATION: X PLACEMENT OF PIPE IN CHANNEL: X
CHANNEL EXCAVATION: X CONSTRUCTION OF A DAM/FLOODING: _
OTHER'
11. IF CONSTRUCTION OF A POND IS PROPOSED, WHAT IS THE SIZE OF THE WATERSHED
DRAINING TO THE POND? WHAT IS THE EXPECTED POND SURFACE AREA? .
12. DESCRIPTION OF PROPOSED WORK INCLUDING DISCUSSION OF TYPE OF MECHANICAL
EQUIPMENT TO BE USED? (ATTACH PLANS; 81/2 BY 11 DRAWINGS ONLY)
13. PURPOSE OF PROPOSED WORK: Repair of deteriorating stream caused by scour and erosion of
stream banks.
14. STATE REASONS WHY.IT IS BELIEVED THAT THIS ACTIVITY MUST BE CARRIED OUT IN
WETLANDS (INCLUDE ANY MEASURES TAKEN TO NIINIMIZE WETLAND IN[PACTS)
Deterioratin-a stream banks are in dangerous condition. In order to repair banks and allow for expected
flow, a chance in stream bottom grade is required.
15. YOU ARE REQUIRED TO CONTACT THE US FISH AND WILDLIFE SERVICE AND/OR
NATIONAL MARINE FISHERIES SERVICE REGARDING THE PRESENCE OF ANY FEDERALLY
LISTED OR PROPOSED FOR LISTING ENDANGERED OR THREATENED SPECIES OR CRITICAL
HABITAT IN THE PERMIT AREA THAT MAY BE AFFECTED BY THE PROPOSED PROJECT.
DATE CONTACTED:
16. YOU ARE REQUIRED TO CONTACT THE STATE HISTORIC PRESERVATION OFFICER
(SHPO) REGARDING THE PRESENCE OF HISTORIC PROPERTIES IN THE PERMIT AREAWHICH
MAY BE AFFECTED BY THE PROPOSED PROJECT. DATE CONTACTED 1/23/01.
17. DOES THE PROJECT INVOLVE AN EXPENDITURE OF PUBLIC FUNDS OR THE USE OF
PUBLIC (STATE) LAND? YES ® NO ? (IF NO, GO TO 16)
(a) IF YES, DOES THE PROJECT REQUIRE PREPARATION OF AN ENVIRONMENTAL
DOCUMENT PURSUANT TO THE REQUIREMENTS OF THE NORTH CAROLINA
ENVIRONMENTAL POLICY ACT? YES ? NO
(b) IF YES, HAS THE DOCUMENT BEEN REVIEWED THROUGH THE NORTH CAROLINA
DEPARTMENT OF ADMINISTRATION STATE CLEARINGHOUSE YES ? NO ?
IF ANSWER 17b IS YES, THEN SUBMIT APPROPRIATE DOCUMENTATION FROM THE STATE
CLEARINGHOUSE WITH THE NORTH CAROLINA ENVIRONMENTAL POLICY ACT.
QUESTIONS REGARDING THE STATE CLEARINGHOUSE REVIEW PROCESS SHOULD BE
DIRECTED TO MS. CHRYS BAGGETT, DIRECTOR STATE CLEARINGHOUSE, NORTH
CAROLINA DEPARTMENT OF ADMINISTRATION, 116 WEST JONES STREET, RALEIGH,
NORTH CAROLINA 27603-8003, TELEPHONE [phone].
18. THE FOLLOWING ITEMS SHOULD BE INCLUDED WITH THIS APPLICATION IF PROPOSED
ACTIVITY INVOLVES THE DISCHARGE OF EXCAVATED OF FILL MATERIAL INTO
WETLANDS:
(a) WETLAND DELINEATION MAP SHOWING ALL WETLANDS, STREAMS, LAKES, AND
PONDS ON THE PROPERTY (FOR NATIONWIDE PERMIT NUMBERS 14, 18, 21, 26, 29, AND 38).
ALL STREAM (INTERMITTENT AND PERMANENT) ON THE PROPERTY MUST BE SHOWN ON
THE MAP. MAP SCALES SHOULD BE 1 INCH EQUALS 50 FEET OR 1 INCH EQUALS 100 FEET
OF THEIR EQUIVALENT.
(b) IF AVAILABLE, REPRESENTATIVE PHOTOGRAPH OF WETLANDS TO BE IMPACTED BY
PRODUCT.
(c) IF DELINEATION WAS PERFORMED BY A CONSULTANT, INCLUDE ALL DATA SHEETS
RELEVANT TO THE PLACEMENT OF THE DELINEATION LINE.
(d) ATTACH A COPY OF THE STORMWATER MANAGEMENT PLAN IF REQUIRED.
(e) WHAT IS LAND USE OF SURROUNDING PROPERTY?
(fl IF APPLICABLE, WHAT IS PROPOSED METHOD OF SEWAGE DISPOSAL? _
SIGNED AND DATED AGENT AUTHORIZATION LETTER, IF APPLICABLE.
NOTE: WETLANDS OR WATERS OF THE US MAY NOT BE IMPACTED PRIOR TO:
1. ISSUANCE OF A SECTION 404 CORPS OF ENGINEERS PERMIT,
2. EITHER THE ISSUANCE OR WAIVER OF A 401 DIVISION OF WATER QUALITY
CERTIFICATION, AND
3. (IN THE TWENTY COASTAL COUNTIES ONLY), A LETTER FROM THE NORTH
CAROLINA DIVISION OF COASTAL MANAGEMENT STATING THE PROPOSED
ACTIVITY IS CfJNS?THE NORTH CAROLINA COASTAL MANAGEMENT
PROGRAM,/
OWNER'S/AGENTS SIGNATURE DATE
(AGENT'S SIGNATURE VALID ONLY
IF AUTHORIZATION LETTER FROM
THE OWNER IS .PROVIDED).
3
MARSDEN BRANCH DRAINAGE IMPROVEMENT PROJECT
NARRATIVE
Proiect Location:
The project is located between Rosemont Avenue and Ashley Circle. The project starts
at Winston Blvd. and continues to near the outfall at Randall Pond.
Proiect Description:
Extreme flow velocities caused by an undersized pipe culvert at Winston Blvd. is
believed to have started: the scour of the stream banks of Marsden Branch. Several
decades of high velocity flow during large storm events has continued to severely erode
the banks to dangerous conditions. Roots of many trees have been exposed or undercut
due to this problem. Several buildings are also in danger of being undercut. One
building, near the Station 5+50, has already had its foundation undercut.
The stream drains a 42-acre watershed comprised of single family residential, multi-
family residential, and commercial land uses. In addition, the new Independence Blvd.
extension is expected to substantially increase storm runoff when it is complete. The
existing stream cross section is not large enough to allow uniform flow during large
storm events. The smaller wetted perimeter tends to lead to higher than normal
velocities, which leads to more erosion of the stream banks. As a result, the stream banks
along a large portion of the run are extremely steep and unstable. Because of the steep
banks and undercutting caused by scouring, the stream is dangerous for the property
owners adjacent to it.
In an effort to prevent future problems and repair existing problems, the City of
Wilmington proposes the following improvements. Single family residences are located
on both sides of the stream for the entire length. These tight working conditions and an
uneven terrain have limited the options for repair of the existing channel. The existing
36-inch storm drain pipe under Winston Blvd. will be replaced with a 48-inch reinforeced
concrete pipe to allow for larger flow. volumes. This pipe will be extended approximately
75' past the existing outfall to accommodate terrain restrictions. The invert of the pipe is
too deep to achieve the side slope needed to carry the expected flow. The 48-inch RCP
will outfall into a trapezoidal channel: 5' wide, 5' deep, with 1 %i H:1 V side slopes. The
channel will be lined using a high performance turf reinforcement mat which will allow
regrowth of riparian vegetation while also preventing future erosion. Please see
Addendumn "A" for an example of this system. The matting system will allow grass and
other vegetation to grow through just as any typical turf reinforcement mat. The
installation involves unrolling the mats longitudinally down the channel. A termination
trench at the top of each bank will help to anchor the matting in place. Please see the
Typical Channel Section, Sheet 1 in Addendum "A". A series of check slots will be
located every thirty feet along with metal geotextile pins will also aid in the anchoring of
-a
the matting. The details for anchoring the turf reinforcement matting are included in
Addendum "A". Once the matting is installed, sod will be laid in place across the
channel cross section. The new channel run will be 403 feet long, draining from the outlet
endwall at Sta. 1+17 into the inlet of the eighty foot long section of 60-inch reinforeced
concrete pipe at Sta. 5+20. This pipe also is necessary because of terrain restrictions.
The pipe then empties into the existing fiber form lined channel, leading to the existing
sediment basin.
Proposed Sediment Controls:
As stated previously, Marsden Branch empties into an existing sediment basin.
Therefore, sediment and debris are removed from the storm water prior to entering Burnt
Mill Creek. During construction water will be by-pass pumped from the Winston Blvd.
end to the sediment pond. A pump will also be in use in the active construction area to
divert flow around the open soil directly to the pond.
The contractor will be limited to 200 linear feet of the channel corridor fully excavated
and exposed at a time. Once the channel has been lined with the high performance turf
reinforcement matting and the exposed areas have been seeded and either mulched or
covered with biodegradable erosion control blankets, the contractor can expose and
excavate further down the channel. All areas disturbed outside of the proposed channel
will be seeded and mulched for stabilization. The areas to lined with the turf
reinforcement matting will have sod installed within the channel banks.
Vegetation will be replaced to the extent possible. Two trees will be planted at or near
the easement line of each individual property to allow access to the channel for
maintenance. Plantings will follow the stabilization activities listed above.
Wetlands:
This project will have minimal wetlands impact. Wetlands are located only at the bottom
of the existing stream. Less than one tenth of an acre will be affected.

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DATE: 8/28/02
PROJECT NO. DM-iH-0902 MARS D EN BRANCH DRAWN BY J. NOBLES
DRAINAGE REPAIR PROJECT
CHECKED BY J. NOBLES
SHEET 2
SCALE WS
z 44.
WATER FLOW
12 in
NOTES:
1. BOTTOM OF ANCHOR TRENCH SHALL EXTEND AT LEAST 1 ft BELOW
INVERT OF PIPE.
2. SECURE AT l ft INTERVALS, BACKFILL AND COMPACT SOIL
TERMINAL ANCHOR TRENCH DETAIL
NTS
DATE: 8/28/02
PROJECT NO. DRA-1H-0902
DRAWN BY J. NOBLES
CHECKED BY J. NOBLES
SCALE
NTS
MARSDEN BRANCH
DRAINAGE REPAIR PROJECT
SHEET 3
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18 in.
18 in.
3ft

A 3ft

NOTES:
1. ANCHOR PATTERN 2.5 ANCHO RS / (2 ANCHORS / Yd"2) (FOR:
2H:1V<SLOPES<1 H:1V AND CHANNELS)
2. 18" LONG METAL GEOTEXTILE PINS ARE TO BE USED TO ANCHOR TRMs TO THE
GROUND SURFACE. U-SHAPED WIRE STAPLES OR TRIANGULAR WOODEN OR PLASTIC
STAKES SHALL NOT BE PERMITTED.
ANCHOR PATTERN DETAIL
NTS
DATE: 8/28/02
MAR S D E N BRANCH
`
PROJECT NO. DM-IH-0902 "?
~
DRAINAGE REPAIR PROJECT ?
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DRAWN BY J. NOBLES
CHECKED BY J. NOBLES

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SCALE NTS

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6 in
6 in
NOTES:
1. SECURE AT 30 cm (1 ft) INTERVALS, BACKFILL AND COMPACT SOIL
INTERMITTENT CHECK SLOT DETAIL
NTS
DATE: 8/28/02
MAR S D E N BRANCH
PROJECT NO. DRA-IH-0902
DRAWN BY J. NOBLES DRAINAGE REPAIR PROJECT - °y
CHECKED BY J. NOBLES y ---

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THE PICTURE IS THE STORAGE BUILDING SHOWN ON DRAWING SHEET 2
NEAR STATION 5+50.
SHEET 6
PHOTOS TAKEN FROM THE
WINSTON BLVD. CULVERT
LOOKING DOWNSTREAM.
SHEET 7
Sheet 8
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Earthstopping Solutions.
High Performance
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The Fom-th Dimension in Soft Armor
A Streambank and Shoreline Stabilization
''A Landfill Slopes and Channels
Wrapped-Face Slopes
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46.7 kN/m
(3200 Ib/fl)
1 Minimum average roll values; wide width tensile test per ASTM D-4595
2 Manufacturer only publishes typical values
AASHTO is an acronym for the American Association of State Highway Transportation Officials
Nylon TRM' Poyolefln THM Type II AASHTO M288-99 PYRAMAT'
Biaxial Geogrld Class 1 High Performance
Stabilization THM
Geotextile
- v
The erosion and sediment control industry has rapidly
evolved into a diverse hierarchy of cost-effective
methods and techniques. The adjacent Performance
Pyramid highlights the four primary divisions of
vegetated erosion control techniques.
In order of increasing functionality and
performance are:
A Basic Mulching Techniques a
A Advanced Mulching Techniques
? Turf Reinforcement Mats
6`.
A High Performance ? "
Turf Reinforcement Mats „
Superior tensile properties combined with rugged
construction, durability, proven performance and
unsurpassed functional longevity clearly separate the
high survivability Pyramato from existing TRMs.
Geosynthetic erosion control materials
have risen to a new level.
5

Funcfou Longevity f the Ages
Reinforcement matrices must provide long-term perfor-
mance under adverse conditions. In and to semi-arid
regions or sites where establishment of vegetation is slow,
inadequately stabilized TRMs may undergo significant UV
degradation prior to performing their primary function.
The durable Pyramato erosion matrix is designed to
withstand prolonged exposure in the challenging conditions
of demanding jobsites or inhospitable climates. Ultraviolet
stabilizers assure functional longevity when vegetative
establishment is delayed or the matrix is otherwise exposed
to extended periods of sunlight.
Pyramat's polypropylene yarns are resistant to biodegrada-
tion and unaffected by chemicals normally found in soils.
Some polymers, such as moisture absorbing polyamides
(nylon), may be subject to temporary and permanent loss of
strength from both chemical and hydrolytic attack. Because
polyolefins (polypropylene) absorb negligible amounts of
water, Pyramat will maintain its tensile properties under
saturated conditions with no long-term loss of strength via
hydrolysis.
This corrosion resistant matrix will endure as a key compo-
nent of a shoreline protection system, even in brackish or salt
water conditions. Careful polymer selection, high strength,
resiliency, abrasion and puncture resistance, and unsurpassed
dimensional stability ensure these pyramids will also stand the
test of time.
Pyramat® high performance TRM provides "rebar for root systems."
Pe Performance
Performance of Pyramat® erosion matrix has been
extensively evaluated at two renowned hydraulics
testing laboratories in the western United States.
Establishing a flow rate versus time continuum,
performance (see graph below) has been quantified
using vegetated and non-vegetated mattings versus
nonreinforced vegetation and bare soil. These
studies identify the design window which provides
performance guidelines from time of installation,
transitioning to a mature vegetated condition for
the long-term design life of the project.
Maximum recommended permissible velocities and
shear stresses for Pyramat are presented in the table
above. Vegetated, Pyramat will resist flow velocities
of up to 7.6 m/sec (25 ft/sec) at shear stresses up to
48.9 kgW (10 lb/O.
Additionally, the resistance of unvegetated Pyramat
to directly applied shear stresses was measured using a
specially designed flume. The Pyramat three-dimen-
sional structure resisted the maximum shear developed
at full-flume capacity with no deformation whatsoever.
Maximum shear stress developed was approximately
39.2 kg/m2 (8 lb/ft2) at a velocity of 6.1 m/sec
(20 ft/sec).
The graph below illustrates the enhanced performance
of Pyramat high performance turf reinforcement mat
above that of conventional Biotechnical Composites® and
natural vegetation.
r=
z
H
W

0
a
c7
W
Pyramat® high
performance TRM
(HP-TRM) takes tun`
reinforcement to
unprecedented levels.
ROW DURATION (hours)
•Baseduponlonp-term50hour)flowdata.
'• Indudeserosioncont da*A,fberrovingsystems,hydradkhtrawmulches,etc.
PYRAMAT® MAXIMUM PERMISSIBLE DESIGN VALUES
High velocity hydraulic flume testing.
LONG-TERM PERFORMANCE GUIDELINES*
PYRAMA1' Applications
i yramaO handles a broad range of discriminating
biotechnical applications requiring vegetated soil reinforce-
ment and stabilization including:
1 Stormwater/Drainage High Flow Channels
1 Landfill Caps, Slopes & Diversion Structures
• Dam, Dike & Levee Protection
A Bank & Shoreline Stabilization
A Geosynthetic Reinforced Earth Structures
,A Vegetated Geotextile Slope Facings
,A Veneer Cover Soil Stabilization
PYRAMAT' stallatio
The rugged Pyramat matrix will also absorb considerable
installation stress permitting the use of mechanical equip-
ment. The matrix will perform best when installed beneath
the soil surface.
A When used as a vegetative reinforcement matrix,
the product should be installed first, seeded, then
a'/z'- L" veneer of soil placed and compacted
into the "pyra-cells."
A Light weight wheeled equipment or vibratory
tampers may be carefully utilized to facilitate
compaction.
A Refer to the Synthetic Industries Pyramat
Installation instructions as a soil-filled matrix.
A Inlet/Outlet Protection A For other installation requirements, please
contact SI® Geosolutions for prompt
Other potential applications include: recommendations and on-site construction
assistance at [phone] or toll free in
Grassed Access Roads/Temporary Parking Areas
the USA at (800) FIX-SOIL.
A Pre-grown Reinforced Vegetated Carpets
® Rini-nvinPPred "Cienlnac"
Steep slope stabilization.
8
46 Engineering Specifications
The HIGH PERFORMANCE TURF REINFORCEMENT
MAT shall be a three-dimensional, lofty, woven polypropylene
geotextile specially designed for erosion control applications
on steep slopes, water containment structures and vegetated
waterways. The matrix shall be composed of polypropylene
monofilament yarns woven into a uniform, dimensionally
stable configuration of resilient pyramid-like projections. The
material shall exhibit very high interlock and reinforcement
capacity with both soil and root systems and demonstrate high
tensile modulus. The high performance TRM shall conform to
the property values listed below under dry or saturated
conditions.
,
M tfVf AVERAGE ROLL VALUES fY?iV
S+i ( )
MI A?g ' W ' i L lei I ? pFs ., ?.
MECHANICAL
ASTM D-4595 3,200 X 2,200 Ib/ft 46.7 X 32.1 kN/m
Tensile Strength2
ASTM D-5035 3,100 X 2,000 lb/ft 45.2 X 29.2 kN/m
ASTM D-4595 80% (max) 80% (max)
Tensile Elongation2
ASTM D-5035 55% (max) 55% (max)
ENDURANCE
UV Resistance @ 1000 hours ASTM D-4355 80% 80%
PHYSICAL.
Thickness ASTM D-1777 0.5 in 12.7 mm
Resiliency' ASTM D-1777 80% 80%
Mass Per Unit Area ASTM D-5621 14 oI 475 g/m2
Ground Cover Factor4 Light Projection Analysis 75% 75%
PERFOR NCE
Velocity Short-Term (1h hr) Long-Term (50 hrs)
Vegetated 25 ft/sec 7.6 m/sec 14 ft/sec 4.3 m/sec
Unvegetated 20 ft/sec 6.1 m/sec 10 ft/sec 3.0 m/sec
Shear Stress
Vegetated 10 Ib/ft2 48.9 kg/m2 6 Ib/ft2 29.3 kg/m2
Unvegetated 8 Ib/ft2 39.2 kg/m2 3 lb/ft2 14.7 kg/m2

NOTES. STANDARD ROLL SIZE INFORMATION
I All published values are Minimum Average Roll Values (MARY) unless
otherwise Indicated, yielding a 95% confidence level. Additional property 2.59 m x 27.4 m = 71 m2
values available upon request. _--
2 Values for both machine and cross machine directions under dry or 8.5 ft x 90 ft = 765 ft2 = 85 yd2
saturated conditions.
3 Resiliency defined as percent of original thickness retained after3 cycles of
a 100 psi load (690 kPa) for 60 seconds without load... thickness measured
30 minutes after load removed In accordance with ASTM D-1777.
4 Ground Cover factor represents "% shade" from Lumite4° Light Projection Test
5 Values obtained at an Independent hydraulics testing laboratory.
GCS
EC-DESIGN® 2000, SI's newest erosion control computer software,
lets users select the most appropriate erosion control product for a
variety of channel and slope applications. The calculations follow
state-of-the-practice U.S. Federal Highway Administration
(FHWA) and Department of Agriculture (USDA) procedures,
including maximum velocity and shear stress analyses, integration
of compound channels, soil loss estimations and pull-down
window screens. Once the most appropriate product is selected,
the results, specifications and CAD drawings are printed or can
be saved electronically.
EC-DESIGN 2000 offers these important features:
? Channel lining design
A Slope protection design analysis
Maximum permissible velocity and shear stress approaches
A Integration of compound flexible channel lining systems
? Interactive cost analysis for channels and slopes
Specify the best with total confidence.
SMART SOLUT t NS?
Analyzing and solving civil and environmental problems is our
focus. We want to work with you on your next project.
FOR ADDITIONAL INFORMATION, PLEASE CALL:
SIS Geosolutions
6025 Lee Highway, Suite 435
Chattanooga, TN 37421 USA
Toll free in the USA: (800) FIX-SOIL or [phone]
Office: [phone] Fax: [phone]
Internet: wwwfixsoil.com
Membership Affiliations Include:
GEOSYNTHETIC RESEARCH INSTITUTE
INTERNATIONAL w. 'e
EROSION CONTROL ASSOOATION .1p0 coyr
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Construction and Civil Engineering Solutions
• GEOTEXS woven and nonwoven geotextiles
• GEOTEXS structural soil reinforcement geotextiles and
geotextile tubes
• PAVE-DRYS asphalt overlay fabrics
• LANDLOKS turf reinforcement mats, erosion control blankets
and fiber roving systems
• LANDLOKS natural erosion control blankets
• PYRAMATS high performance turf reinforcement mat
• GEOFIBERSS 3-dimensional soil reinforcement fibers
• FIBERMESHS synthetic fibers for concrete reinforcement
• NOVOCONS steel fibers for concrete reinforcement
Call us or one of our many distributors today.
Distributed by.
SI' Geosolutions
Seller makes no warranty, express or Implied, concerning the product furnished hereunder other than at the time of delivery it shall be of the quality and specification stated herein.
Any implied warranty of fitness for a particular purpose Is expressly excluded, and, to the extent that it Is contrary to the foregoing sentence, any Implied warranty of merchantability
Is expressly excluded. Any recommendations made by Seiler concerning the uses or applications of said product are believed reliable and Seller makes no warranty of results to be
obtained. If the product does not meet SI• Corporation's current published specifications, and the customer gives notice to SI Corporation before Installing the product, then SI
Corporation will replace the product without charge or refund the purchase price.
Pyramat• high performance turf reinforcement mat is covered by U.S. Patents 95,567,087 and 5,616,399. Pyramat is a registered trademark of SI' Corporation.
® 2000 SI• Corporation Printed in USA
GPD-PM-100 11/00.15M
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Product Data Sheet
r
PYRAMATO
PYRAMAT is manufactured at one of SI Corporation facilities that has achieved ISO-9002 certification for its
systematic approach to quality. PYRAMAT high performance turf reinforcement mat is a three-dimensional, lofty,
woven polypropylene geotextile specially designed for erosion control applications on steep slopes and vegetated
waterways. The matrix is composed of polypropylene monofilament yams woven into a uniform configuration of
resilient pyramid-like projections. The material exhibits very high interlock and reinforcement capacity with both
soil and root systems and demonstrates high tensile modulus. The TRM conforms to the property values listed
below', which have been derived from quality control testing performed by one of SI Corporations GAI-LAP
accredited laboratories:
MARV2
PROPERTY TEST METHOD ENGLISH METRIC
Physical
Mass/Unit Area ASTM D5261 14 oz/yd2 475 g/m2
Thicknese ASTM D1777 0.5 in 12.7 mm
Resiliency s ASTM D1777 80% 80%
Ground Cover Factors Light Proj. Analysis 75% 75%
Mechanical
Grab Tensile Strength ASTM D50353 3,100 x 2,000 lb/ft 45.2 x 29.2 kN/m
Grab Elongation ASTM D50353 55% (max) 55% (max)
Grab Tensile Strength ASTM D4595 3,200 x 2,200 lbht 46.7 x 32.1 kN/m
Grab Tensile Elongation ASTM D4595 65% (max) 65% (max)
Secant Modulus @ 10%
Elongation ASTM D4595 7,500 x 6,700 lb/ft 109.5 x 98.5 kN/m
Endurance
UV Resistance @ 3000 hrs ASTM D4355 80% 80%

Roll Sizes 8.5 ft x 90 ft 2.59 m x 27A m
NOTES:
I The property values listed above are effective 9/6/2000 and are subject to change without notice.
'- Values for maclvne and cross machine directions, respectively, under dry or saturated conditions. Minimum average roll values are calculated as the
typical minus two standard deviations. Statistically, it yields a 97.7% degree of confidence that any samples taken from quality assurance testing will
exceed the value reported. Typical indicates mean or average of all test data.
3 Formerly test method ASTM D1682.
4 Modified ASTM D1777 using 6" Pressure Plate and 0.2 kPA
5 Resilient defined as of original thickness retained after 3 cycles of a 100
Resiliency percent psi load for 60 seconds followed by 60 seconds without
load...thiclness measured 30 measured after load removed by ASTM Di 777.
6 Ground Cover Factor represents "% shade"- from Lumite Light Projection Test.
Maximum permissible design values listed are based on short-term 0.50 hrs), - --
( vegetated data obtained at an independent hydraulics testing facility.
SELLER MACES NO WARRANTY,EXPRESS OR IMPLIED, CONCERNING THE PRODUCT FURNISHED HEREUNDER OTHER THAN AT THE TIME OF DELIVERY IT SWILL BE OF THE OUALrrY AND SPECIFIdAT10N
STATED HEREIN. ANY IMPLIED WARRANTY OF FITNESS FOR A PARTICUAR PURPOSE IS EXPRESSLY EXCLUDED, AND, TO THE EXTENT THAT IT IS CONTRARY TO THE FOREGOING SENTENCE, ANY
IMPLIED WARRANTYOF MERCHANTABILITY IS EXPRESSLY EXCLUDED. ANY RECOMMENDATIONS MADE BY SELLER CONCERNING THE USES OR APPLICATIONS OF SAID PRODUCT ARE BELIEVED
RELIABLE AND SELLER MAKES NO WARRANTY OF RESULTS TO BE OBTAINED. IF THE PRODUCT DOES NOT MEET SYNTHETIC INDUSTRIES CURRENT PUBLISHED SPECIFICATIONS, AND THE CUSTOMER
GIVES NOTICE TO SYNTHETIC INDUSTRIES BEFORE INSTALLING THE PRODUCT, THEN SYNTHETIC INDUSTRIES WILL REPLACE THE PRODUCT WITHOUT CHARGE OR REFUND THE PURCHASE PRICE
6025 Lee Highway, Suite 435 • Chattanooga, Tennessee USA - [phone] or [phone] • FAX [phone] - www.fixsoil.com
CITY OF WILMINGTON • PO BOX 1810 • WILMINGTON, NC 28402-1810 CHECK NO. 137550
DATE r lll4s.? 1 C p P ROi .:'r.H)t; R P I_ Cliw AMOUNT
J 3c? ' P,qy?'?^ -„711:,x; MIN! i:iRANCH ?`?1rI.(7F: 4?CC
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