20170230 Ver 1_401 Application_20170217

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COMf IANC£ INTEGRITY M.M1N EMEN
February 22, 2017
NC DWQ, WBSCP Unit
512 North Salisbury Street
Raleigh, NC 27604
Re: Pipeline Maintenance Project No. 8912
Mecklenburg County, North Carolina
Tributary to Mallard Creek
To Whom It May Concern:
Piedmont Natural Gas Company, Inc. (Piedmont) is proposing to perform maintenance on a 16"
pipeline for erosion protection. The pipeline has become exposed at a tributary to the Mallard Creek,
located in Mecklenburg County, North Carolina. The site is on the "Harrisburg, North Carolina"
USGS Quadrangle sheet. GPS Coordinates are 35.348435 N, 80.697769 W. Piedmont proposes to
re-establish cover over the exposed pipeline and armor the prepared areas with a 42' wide x 50' long
System 21TM Articulating Grout Mat as shown in the drawings. Please find enclosed information
package and application form on this project. A copy of the application package is also submitted to
U.S. Army Corps of Engineers.
This project involves the repair to a previously authorized, currently serviceable structure and fill.
The structure will not to be put to uses differing from those uses contemplated for it in the original
permit. Piedmont proposes to restore pipeline protection and the adjacent stream bank in such a
manner that all adverse environmental effects are minimal. This project was designed with the
minimum materials necessary to protect the structure and to ensure the safety of the pipeline while
preventing future erosion and exposure. Minor deviations in the structure's filled area include those
due to changes in materials, construction techniques, and current construction codes for safety
standards that are necessary to make the rehabilitation. Any stream channel modification will be
limited to the minimum necessary for protecting the integrity of the pipeline.
Should you require any additional information or have any questions regarding this project, please
do not hesitate to contact Sandra Endlich at [phone] or via [e-mail].
Sincerely,
Sandra Endlich
Sr. Envionmental and Regulatory Specialist
Ecodyne LLC
Ecodyne LLC • 7201 Fairbanks N. Houston Rd • Houston, Texas 77040 • [phone] • Fax [phone]

E c Ol dyne
404�
COMPLIANCE INTEGRITY MANAGEMENI
Piedmont Natural Gas Company, Inc
4720 Piedmont Row Dr
Charlotte, North Carolina 28210
Piedmont Projects 8909, 8910 and 8912 located in Mecklenburg County, North Carolina
In accordance with our proposal for the installation of an erosion control system at the referenced location,
Ecodyne LLC is prepared to act as Agent for your Company in processing the required application for
permits from various agencies.
Your designation of Ecodyne LLC to act as Agent should be acknowledged by the appropriate
signature below. This designation includes your agreement to furnish, upon request by the
agencies, any supplemental information in support of the application. This document in no way
commits or obligates Piedmont Natural Gas Company, Inc
in any way to proceed with actual construction.
Thank you for your cooperation.
Respectfully,
Sandra Endlich
Sr. Environmental and Regulatory Specialist
Ecodyne LLC
Ecodyne LLC in hereby designated as Authorized Agent to process applications and is
authorized to sign on our behalf for permits concerning the above referenced project location.
thomas.morris Ie Digitaned by
[e-mail]
DN: cn=[e-mail]
dmontng.com Date: 2017.02.2113:15:17-05'00'
Piedmont Natural Gas Company, Inc Date

C, `Y
Office Use Only:
Corps action ID no.
DWQ project no.
Form Version 1.4 January 2009
Page 1 of 10
PCN Form — Version 1.4 January 2009
Pre -Construction Notification (PCN) Form
A.
Applicant Information
1.
Processing
1 a.
Type(s) of approval sought from the Corps:
❑X Section 404 Permit ❑ Section 10 Permit
1 b.
Specify Nationwide Permit (NWP) number: 3 or General Permit (GP) number:
1c.
Has the NWP or GP number been verified by the Corps?
❑ Yes ❑X No
1 d.
Type(s) of approval sought from the DWQ (check all that apply):
❑X 401 Water Quality Certification — Regular ❑ Non -404 Jurisdictional General Permit
❑ 401 Water Quality Certification — Express ❑ Riparian Buffer Authorization
1 e.
Is this notification solely for the record
because written approval is not required?
For the record only for DWQ
401 Certification:
❑ Yes X❑ No
For the record only for Corps Permit:
❑ Yes ❑X No
1f.
Is payment into a mitigation bank or in -lieu fee program proposed for
mitigation of impacts? If so, attach the acceptance letter from mitigation bank
or in -lieu fee program.
❑ Yes ❑X No
1 g.
Is the project located in any of NC's twenty coastal counties. If yes, answer 1 h
below.
❑ Yes ❑X No
1 h.
Is the project located within a NC DCM Area of Environmental Concern (AEC)?
❑ Yes ❑X No
2.
Project Information
2a.
Name of project:
8912 — Trib to Mallard Creek/Hwy29 Speedway (IR#2151445)
2b.
County:
Mecklenburg
2c.
Nearest municipality / town:
Charlotte
2d.
Subdivision name:
NA
2e.
NCDOT only, T.I.P. or state project no:
NA
3.
Owner Information
3a.
Name(s) on Recorded Deed:
Plase Maxwell Christenbury, Jr and Henrietta C. Christenbury
3b.
Deed Book and Page No.
29504, Page 617
3c.
Responsible Party (for LLC if
applicable):
Christenbury Family, LLC
3d.
Street address:
673 Grandview Dr NE
3e.
City, state, zip:
Concord, NC 28025-3156
3f.
Telephone no.:
704.305.0226
3g.
Fax no.:
NA
3h.
Email address:
NA
Page 1 of 10
PCN Form — Version 1.4 January 2009

4.
Applicant Information (if different from owner)
4a.
Applicant is:
❑ Agent ❑X Other, specify: Easement holder and pipeline owner
4b.
Name:
Tom Morris
4c.
Business name
(if applicable):
Piedmont Natural Gas Company, Inc
4d.
Street address:
4720 Piedmont Row Drive
4e.
City, state, zip:
Charlotte, North Carolina 28210
4f.
Telephone no.:
704-731-4245
4g.
Fax no.:
N/A
4h.
Email address:
[e-mail]
5.
Agent/Consultant Information (if applicable)
5a.
Name:
Sandra Endlich
5b.
Business name
(if applicable):
Ecodyne LLC
5c.
Street address:
7201 Fairbanks N Houston Rd
5d.
City, state, zip:
Houston, TX 77040
5e.
Telephone no.:
713-460-4601
5f.
Fax no.:
N/A
5g.
Email address:
[e-mail]
Page 2 of 10

B.
Project Information and Prior Project History
1.
Property Identification
1a.
Property identification no. (tax PIN or parcel ID):
Parcel ID: 02954104
1 b.
Site coordinates (in decimal degrees):
Latitude: 35.348435 Longitude: -80.697769
1 c.
Property size:
14.53 acres
2.
Surface Waters
2a.
Name of nearest body of water to proposed project:
Tributary to Mallard Creek
2b.
Water Quality Classification of nearest receiving water:
Mallard Creek - C
2c.
River basin:
Yadkin Pee -Dee
3.
Project Description
3a. Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this
application:
The project site is located within a maintained pipeline right-of-way surrounded by open space and residential area.
3b.
List the total estimated acreage of all existing wetlands on the property: 0
3c.
List the total estimated linear feet of all existing streams (intermittent and perennial) on the property: 140
3d. Explain the purpose of the proposed project:
The purpose of the proposed project is to re-establish cover over existing pipeline that has become exposed and armor the adjacent areas.
3e. Describe the overall project in detail, including the type of equipment to be used:
See information package, Scope of Work.
4.
Jurisdictional Determinations
4a.
Have jurisdictional wetland or stream determinations by the
Corps or State been requested or obtained for this property /
project (includingall prior phases in the past?
❑ Yes ❑X No ❑ Unknown
Comments:
4b.
If the Corps made the jurisdictional determination, what type
of determination was made?
❑ Preliminary ❑ Final
4c.
If yes, who delineated the jurisdictional areas?
Name (if known):
Agency/Consultant Company:
Other:
4d.
If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
5.
Project History
5a.
Have permits or certifications been requested or obtained for
this project (including all prior phases) in the past?
❑ Yes ❑X No ❑ Unknown
5b.
If yes, explain in detail according to "help file" instructions.
6.
Future Project Plans
6a.
Is this a phased project?
❑ Yes ❑X No
6b.
If yes, explain.
Page 3 of 10
PCN Form — Version 1.4 January 2009

C. Proposed Impacts Inventory
1. Impacts Summary
1 a. Which sections were completed below for your project (check all that apply):
❑ Wetlands ❑X Streams — tributaries ❑ Buffers ❑ Open Waters ❑ Pond Construction
2. Wetland Impacts
If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted.
2a.
Wetland impact
number
Permanent (P) or
Temporary T
2b.
Type of impact
2c.
Type of wetland
2d.
Forested
2e.
Type of jurisdiction
Corps (404,10) or
DWQ (401, other)
2f.
Area of
impact
(acres)
W1 -
Choose one
Choose one
Yes/No
-
W2 -
Choose one
Choose one
Yes/No
W3 -
Choose one
Choose one
Yes/No
W4 -
Choose one
Choose one
Yes/No
W5 -
Choose one
Choose one
Yes/No
W6 -
Choose one
Choose one
Yes/No
2g. Total Wetland Impacts:
2h. Comments:
3. Stream Impacts
If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site, then complete this
question for all stream sites impacted.
3a.
Stream impact
number
Permanent (P) or
Temporary (T)
3b.
Type of impact
3c.
Stream name
3d.
Perennial (PER) or
intermittent (INT)?
3e.
Type of
jurisdiction
3f.
Average
stream
width
(feet)
3g.
Impact
length
(linear
feet)
S1 P
Fill
Trib. to Mallard Creek
INT
Corps
10
50
S2 T
Fill
Trib. to Mallard Creek
INT
Corps
10
90
S3 -
Choose one
S4 -
Choose one
S5 -
Choose one
-
S6 -
Choose one
3h. Total stream and tributary impacts
140
3i. Comments:
Page 4 of 10
PCN Form — Version 1.4 January 2009

4. Open Water Impacts
If there are proposed impacts to lakes, ponds, estuaries, tributaries, sounds, the Atlantic Ocean, or any other open water of
the U.S. then indivi ually list all open water impacts below.
4a.
Open water
impact number
Permanent (P) or
Temporary T
4b.
Name of waterbody
(if applicable)
4c.
Type of impact
4d.
Waterbody
type
4e.
Area of impact (acres)
01 -
Choose one
Choose
02 -
Choose one
Choose
03 -
Choose one
Choose
04 -
Choose one
Choose
4f. Total open water impacts
4g. Comments:
5. Pond or Lake Construction
If pond or lake construction proposed, the complete the chart below.
5a.
Pond ID number
5b.
Proposed use or
purpose of pond
5c.
Wetland Impacts (acres)
5d.
Stream Impacts (feet)
5e.
Upland
(acres)
Flooded
Filled
Excavated
Flooded
Filled
Excavated
P1
Choose one
P2
Choose one
5f. Total:
5g. Comments:
5h. Is a dam high hazard permit required?
❑ Yes ❑ No If yes, permit ID no:
5i. Expected pond surface area (acres):
5j. Size of pond watershed (acres):
5k. Method of construction:
6. Buffer Impacts (for DWQ)
If project will impact a protected riparian buffer, then complete the chart below. If yes, then individually list all buffer impacts
below. If any impacts require mitigation, then you MUST fill out Section D of this form.
6a. Project is in which protected basin?
❑ Neuse ❑ Tar -Pamlico ❑ Catawba ❑ Randleman ❑ Other:
6b.
Buffer Impact
number —
Permanent (P) or
Temporary (T)
6c.
Reason for impact
6d.
Stream name
6e.
Buffer
mitigation
required?
6f.
Zone 1
impact
(square
feet)
6g.
Zone 2
impact
(square
feet
B1
Yes/No
B2 -
Yes/No
B3 -
Yes/No
B4 -
Yes/No
B5 -
Yes/No
B6 -
Yes/No
6h. Total Buffer Impacts:
6i. Comments:
Page 5 of 10

D.
Impact Justification and Mitigation
1.
Avoidance and Minimization
1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
The project is designed in the way that the impact area will be minimized.
1 b.
Erosion
Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
and sediment control measures will be taken. All temporary disturbed area will be stabilized with native seed mix.
2.
Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a.
Does the project require Compensatory Mitigation for
impacts to Waters of the U.S. or Waters of the State?
❑ Yes ❑X No
2b.
If yes, mitigation is required by (check all that apply):
❑ DWQ ❑ Corps
2c.
If yes, which mitigation option will be used for this
project?
❑ Mitigation bank
El Payment to in -lieu fee program
❑ Permittee Responsible Mitigation
3.
Complete if Using a Mitigation Bank
3a.
Name of Mitigation Bank:
3b.
Credits Purchased (attach receipt and letter)
Type: Choose one
Type: Choose one
Type: Choose one
Quantity:
Quantity:
Quantity:
3c. Comments:
4.
Complete if Making a Payment to In -lieu Fee Program
4a.
Approval letter from in -lieu fee program is attached.
❑ Yes
4b.
Stream mitigation requested:
linear feet
4c.
If using stream mitigation, stream temperature:
Choose one
4d. Buffer mitigation requested (DWQ only):
square feet
4e. Riparian wetland mitigation requested:
acres
4f.
Non -riparian wetland mitigation requested:
acres
4g.
Coastal (tidal) wetland mitigation requested:
acres
4h.
Comments:
5.
Complete if Using a Permittee Responsible Mitigation Plan
5a.
If using a permittee responsible mitigation plan, provide a description of the proposed mitigation plan.
Page 6 of 10
PCN Form — Version 1.4 January 2009

6. Buffer Mitigation (State Regulated Riparian Buffer Rules) — required by DWQ
6a. Will the project result in an impact within a protected riparian buffer that requires
❑ Yes ❑ No
buffer mitigation?
6b. If yes, then identify the square feet of impact to each zone of the riparian buffer that requires mitigation. Calculate the
amount of mitigation required.
6c.
6d.
6e.
Zone
Reason for impact
Total impact
Multiplier
Required mitigation
(square feet)
(square feet)
Zone 1
3 (2 for Catawba)
Zone 2
1.5
6f. Total buffer mitigation required:
6g. If buffer mitigation is required, discuss what type of mitigation is proposed (e.g., payment to private mitigation bank,
permittee responsible riparian buffer restoration, payment into an approved in -lieu fee fund).
6h. Comments:
Page 7 of 10

E.
Stormwater Management and Diffuse Flow Plan (required by DWQ)
1.
Diffuse Flow Plan
1a.
Does the project include or is it adjacent to protected riparian buffers identified
❑ Yes 0 No
within one of the NC Riparian Buffer Protection Rules?
1 b.
If yes, then is a diffuse flow plan included? If no, explain why.
❑ Yes ❑ No
2.
Stormwater Management Plan
2a.
What is the overall percent imperviousness of this project?
90
2b.
Does this project require a Stormwater Management Plan?
❑ Yes 0 No
2c.
If this project DOES NOT require a Stormwater Management Plan, explain why:
This
project does not require a Non -404 Jurisdictional General Permit or is subject to a General Certification 3704 or 3705.
2d.
If this project DOES require a Stormwater Management Plan, then provide a brief, narrative
description of the plan:
N/A
2e.
Who will be responsible for the review of the Stormwater Management Plan?
N/A
3.
Certified Local Government Stormwater Review
3a.
In which localgovernment's jurisdiction is thisproject?
N/A
❑ Phase II
❑ NSW
3b.
Which of the following locally -implemented stormwater management programs
❑ USMP
apply (check all that apply):
❑ Water Supply Watershed
❑ Other:
3c.
Has the approved Stormwater Management Plan with proof of approval been
❑ Yes ❑ No
attached?
4.
DWQ Stormwater Program Review
❑Coastal counties
❑HQW
4a.
Which of the following state -implemented stormwater management programs apply
❑ORW
(check all that apply):
❑Session Law 2006-246
❑ Other:
4b.
Has the approved Stormwater Management Plan with proof of approval been
❑ Yes ❑ No
attached?
5.
DWQ 401 Unit Stormwater Review
5a.
Does the Stormwater Management Plan meet the appropriate requirements?
❑ Yes ❑ No
5b.
Have all of the 401 Unit submittal requirements been met?
❑ Yes ❑ No
Page 8 of 10
PCN Form — Version 1.4 January 2009

F.
Supplementary Information
1.
Environmental Documentation (DWQ Requirement)
1 a.
Does the project involve an expenditure of public (federal/state/local) funds or the
❑ Yes ❑X No
use of public (federal/state) land?
1 b.
If you answered "yes" to the above, does the project require preparation of an
environmental document pursuant to the requirements of the National or State
❑ Yes ❑ No
(North Carolina) Environmental Policy Act (NEPA/SEPA)?
1 c.
If you answered "yes" to the above, has the document review been finalized by the
State Clearing House? (If so, attach a copy of the NEPA or SEPA final approval
❑ Yes ❑ No
letter.)
Comments:
2.
Violations (DWQ Requirement)
2a.
Is the site in violation of DWQ Wetland Rules (15A NCAC 2H .0500), Isolated
Wetland Rules (15A NCAC 2H .1300), DWQ Surface Water or Wetland Standards,
❑ Yes ❑X No
or Riparian Buffer Rules (15A NCAC 2B .0200)?
2b.
Is this an after -the -fact permit application?
❑Yes ❑X No
2c.
If you answered "yes" to one or both of the above questions, provide an explanation of the violation(s):
3.
Cumulative Impacts (DWQ Requirement)
3a.
Will this project (based on past and reasonably anticipated future impacts) result in
❑Yes ❑X No
additional development, which could impact nearby downstream water quality?
3b.
If you answered "yes" to the above, submit a qualitative or quantitative cumulative impact analysis in accordance with the
most recent DWQ policy. If you answered "no," provide a short narrative description.
4.
Sewage Disposal (DWQ Requirement)
4a.
Clearly detail the ultimate treatment methods and disposition (non -discharge or discharge) of wastewater generated from
the proposed project, or available capacity of the subject facility.
No
wastewater will be discharged on-site.
Page 9 of 10
PCN Form — Version 1.4 January 2009

5. Endangered Species and Designated Critical Habitat (Corps Requirement)
5a. Will this project occur in or near an area with federally protected species or
habitat?
❑ Yes X❑ No
5b. Have you checked with the USFWS concerning Endangered Species Act
impacts?
0 Yes ❑ No
5c. If yes, indicate the USFWS Field Office you have contacted.
Asheville
5d. What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical
Habitat?
https://ecos.fws.gov/ipac/
6. Essential Fish Habitat (Corps Requirement)
6a. Will this project occur in or near an area designated as essential fish habitat?
❑ Yes ❑X No
6b. What data sources did you use to determine whether your site would impact Essential Fish Habitat?
NOAA EFH Mapper, http://wvvw.habitat.noaa.gov/protection/efh/efhmapper/index.html
7. Historic or Prehistoric Cultural Resources (Corps Requirement)
7a. Will this project occur in or near an area that the state, federal or tribal
governments have designated as having historic or cultural preservation
status (e.g., National Historic Trust designation or properties significant in
North Carolina history and archaeology)?
❑ Yes ❑X No
7b. What data sources did you use to determine whether your site would impact historic or archeological resources?
http://gis.ncdcr.gov/hpoweb/
8. Flood Zone Designation (Corps Requirement)
8a. Will this project occur in a FEMA -designated 100 -year floodplain?
❑ Yes ❑X No
8b. If yes, explain how project meets FEMA requirements:
8c. What source(s) did you use to make the floodplain determination?
FEMA flood insurance risk maps (FIRMs)
Applicant/Agent's Printed Name
Date
Applicant/Agent's Signature
(Agent's signature is valid only if an authorization
letter from the applicant is provided.
Page 10 of 10

PIEDMONT NATURAL GAS COMPANY, INC.
ECODYNE LLC PROJECT 8912
MECKLENBURG COUNTY, NORTH CAROLINA
TRIBUTARY TO MALLARD CREEK
Ecodyne
Cs) L—CE INTEGWY MANA,EMENT
PROJECT INFORMATION PACKAGE
Enclosures Page No.
AerialImage.................................................................. 2
TopographicMap.................................................................. 2
VicinityMaps.................................................................. 3
HydrographyMap.................................................................. 4
FloodMap.................................................................. 4
WetlandMap.................................................................. 5
Scopeof Work.................................................................. 6
SitePhotographs.................................................................. 8
Project Drawings.................................................................. 10
Prepared On Behalf Of:
Piedmont Natural Gas Company, Inc
Tom Morris
4720 Piedmont Row Drive
Charlotte, North Carolina 28210
[phone]
[e-mail]
Prepared By:
Ecodyne LLC
Sandra Endlich
7201 Fairbanks N. Houston Rd.
Houston, TX 77040
[phone]
[e-mail]

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SCOPE OF WORK
I. INTRODUCTION
Piedmont Natural Gas Company, Inc. (Piedmont) is proposing to perform maintenance on a 16"
pipeline for erosion protection. The pipeline has become exposed at a tributary to the Mallard
Creek. The site has been visited and surveyed on January 25, 2017, and waters were delineated.
No wetlands were found within the project site.
II. SITE DESCRIPTION
The site consists of an exposed 16" pipeline and a 30" pipeline without exposure crossing a
tributary to Mallard Creek, located in Mecklenburg County, North Carolina. The site is on the
"Harrisburg, North Carolina" USGS Quadrangle sheet. GPS Coordinates are 35.348435 N,
80.697769 W. Piedmont proposes to re-establish cover over the exposed pipeline and armor the
prepared areas with a 42' wide x 50' long System 21TM Articulating Grout Mat as shown in the
drawings.
III. CONSTRUCTION SEQUENCE
1. Prepare the site for construction activities and conduct tailgate safety meeting.
2. Install all required soil erosion and sediment control best management practices (BMP's),
pumps, and dewatering barriers (sand bags, bladder bags, etc.).
3. Prepare area for placement of Articulating Grout Mat, including shaping, grading, fill,
and bed/bank preparation, as shown on the drawings.
4. Install Articulating Grout Mat and secure the fabric grout mattress over the pipelines and
prepare area as shown on the drawings.
5. Inflate the fabric form with a structural sand cement mix (grout).
6. Seed disturbed areas within the work site with appropriate mix ratios.
7. The site will be cleaned up to the satisfaction of the respective landowners, according to
conditions agreed upon prior to the commencement of the work.
IV. MATERIAL
System 21 ErcoformTM/ Eco-F1exTM Mat
The System 21 Articulating Block Mat (ABM) is formed with a double layer woven fabric,
joined together into a matrix of rectangular compartments each separated by a narrow perimeter
of interwoven fabric and containing interconnecting high strength revetment cables. Articulating
Page 6

Block Mat forms are positioned on the area to be protected, where they are filled with pumpable
fine aggregate concrete (structural grout) to form a mattress of individual blocks in a bonded
block pattern. The high strength revetment cables become embedded in the blocks to tie the
blocks together and enable the revetment to resist tension in all directions. Patented separate
cable duct design assures that the revetment cables will be positioned securely in the center of
each block. Relief of hydrostatic uplift pressure, caused by entrapped and ground water is
provided through the narrow perimeter of interwoven fabric after the grout has hardened.
Articulating Block Mat (ABM) is custom fabricated into multiple mill width panels, designed to
fit actual site. The System 21 mat is designed for complete pipeline coverage within the creek
bed, while promoting growth of local riparian vegetation within the mat along the creek banks.
This is accomplished by a two phase mat where an ErcoformTM E-60 solid mat and an Eco-
FlexTM open cell mat are combined during manufacturing and pumped on site.
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COR— GROUT SECTION "A—A"
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FLEXIBLE GROL
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Sand/Cement Grout
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Filter Fabric
Nicolon 40/30A or equal
Sand/Cement Grout
4 to 1 sand/cement mix
Filter Fabric
Nicolon 40/30A or equal
Page 7

SITE PHOTOGRAPHS
Page 8

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TRIBUTARY TO MALLARD CREEK
DESIGN PLANS FOR
BANK PROTECTION AND STABILIZATION
PIEDMONT NATURAL GAS
16" LINE
MECKLENBURG COUNTY, NORTH CAROLINA
GRAPHIC SCALE IN FEET
0 200 400 800
Know what's below.
Call before you dig
GRAPHIC SCALE IN FEET
0 150 300 600
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Er -Con
ERCOFORM T'r 8 ECG -FLEX" MAT SPECIFICATION
1.0 GENERAL
1.1 Erouforn ra Mats form cable -reinforced concrete block mattresses that resist
erosive forces. The fabric form consists of a double layer woven fabric; joined
together into a matrix of rectangular compartments, each separated by a narrow
Perimeter of interwoven fabric and containing interconnecting high strength
polyester tendons. The fabric forms are positioned on the area to be protected,
and then filled with a structural grout to form a mattress of individual pillow
shaped. rectangular, blocks In a bonded block pattem. The polyester tendons
become embedded in the cured grout to tie the blocks together and enable the
mat to resist separation in both directions, as well as provide a hinge point for
articulation. Patented separate cable duct design assures that the revetment
cables will be positioned securely in the center of each block. Relief of
hydrostatic uplift pressure, ceused by entrapped and ground water Is provided
through the narrow perimeter of Interwoven fabric after the rout has hardened.
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Articulating
rticulatio Block Mat ABM is custom fabricated Into multiple mill width nets
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designed to fit actual site.
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1.2 Eco -Flex - mats are identical to Erwform ^', but include open cells to provide
environmentally ccmPatible, protection against periodic high flows. After
installation, till material and vegetation can be tented within the cps structure
9 P P
of the mat Eco -Flex ^" mats are comprised of concrete -filled elements and
unfilled areas that allow for the establishment of vegetation. Once the concrete
sets, the defined, unfilled and interwoven areas (approximately 25% of the
pumped area) are opened and filled with topsoil and seeded. Within a growing
season a vegetated cover will normally extend over the lining, resulting in an
erosion control system with the hydraulic, ecological and aesthetic features
desired.
1.3 The System 21ru mat is designed for complete pipeline coverage within the
creek bed utilizing Erooforrn TM. while promoting growth of local riparian
vegetation within the mat along the creek banks, utilizing Eco -Flex 'v. This is
accomplished by a two phase mat were an ErcoformTM solid mat and an Eco-
Flex'open cell mat are combined during manufacturing and pumped on site.
MAT CLASS 1Jr20x14
Average Thirtlgleas, in)
Nominal Block Dim., (in) WeightiBlock (Ibs) Welght/Unit Arm(IW Concrete Coverage (llzlcy) Shear Resistance(Ib/il�
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2.0 FABRIC
2.1 Ercoform ry material shall consist of double -layer woven fabric joined together by
spacer cords into a matrix of rectangular compartments, each separated by a
narrow perimeter of interwoven fabric. Spacer cords shall connect two layers of
fabric atthe center of each compartment to control maximum thickness
uniformly. Fabric formed compartments shall be offset one- half a block length,
in the mill width direction, W provide an interlocking block pattern. Compartments
shall have two grout/cable ducts at the top, two at the bottom and one on each
side of each compartment, to allow for insertion of polyester tendons between
compartments, as well as flow, of gut between compartments.
Physical:
Weight (Double -Layer)
ortyd
6377679
13
Thickness
mile
D7777-75
25
Mill Width
In
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70
Mechanical:
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Grab Tensile Strength
Iia
D4632
Warp -300
FIII - 300
Grab Tensile Elongation
%
D4632
Wap -25
FIII - 65
Mullen Burst Strength
psi
D3786 -80A
525
Trapezoidal Tear Strength
III
D4533
Warp -250
Fill -275
Puncture Strength
Its;
D4833
66
Hydraulic:
Water Flow Rate
gpwd
D4491
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Coefficient of Permeability
cMsec
D4491
0.08
Perm"
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DW
0.97
3.0 POLYESTER TENDONS
3.1 w Polyester tendons shall be constructed of loelongation, continuous
flament fibers. The cable shall have a core construction comprised of parallel
fibers contained within an outer jacket cover. The strength and weight of the
polyester tendons shall be as follows:
E-60/Eco-Flex 20 mm 2.70 3,700
E-80 27mm 4.40 G.
E-100 1 30 mm 5.50 10,000
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4.0 MAT FABRICATION
4.1 The mill width rolls shall be cut to the length required and the two layers of fabric
separately joined bottom edge to bottom edge, and top edge to top edge by
means of a "J" seam using a sewing machine to form multiple mill width panels.
Multiple mill width panels of fabric shall be sewn at the manufacturers fabrication
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facility. The, grab tensile strength of all sewn seams shall be not less than 100
pounds par Inch, when tested in accordance with the requirements of ASTM
D1692.
4.2 Grout stops may be provided as required to control the flow of grout.
4.3 The fabric layers along the top and bottom length of each panel shall be sewn
together to prevent leakage during grout injection.
4.4 Adjacent panels may be field connected by the use of field sewing, zippers or
overlapping, depending on the specific application.
4.5 Polyester tendons shall be installed between the two layers of fabric and through
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the compartment o a manner winch provides for longitudinal and lateral binding
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of the finished Ercofortn TM mat
4.6 The longitudinal polyester tendons shall be placed approximately 11 inches on
center.
4.7 Treraw me cables shall be installed parallel to the block width on centers
approximately equal to the finished block length.
5.0 FINE AGGREGATE CONCRETE
5.1 Fine aggregate concrete consists of a mixture of Portland cement, fine aggregate
(sand) and water, so proportioned and mixed as to provide a pumpable fine
aggregate concrete. Fine aggregate concrete has a typical mix water/cement
ratio of0.65 to 0.75. The pumping of fine aggregate concrete into the fabric forms
a reduction in the water content by fiftering excess mixing water through
the permeable fabric. The reduction of mixing water substantially improves the
water/cement ratio of the in-place fine aggregate concrete thereby Increasing its
strength and durability. With a typical loss of approximately 15% of the total
mixing water, 27 ft' of pumpable fine aggregate concrete will reduce to
approximately 25 113 of hardened concrete. The mixing water reduction will also
result in an increase of approximately 8% in the sand and cement per cubic yard
of concrete. The range of fine aggregate concrete mix proportions provided in
table below has been developed under a variety of field conditions and is suitable
for either on land or underwater.
5.2 Air Entrainment
Mixes designed with 5% to 8% air content will improve the pumpability of the fine
aggregate concrete and the freeze -thaw, resistance of the hardened concrete.
oM�a{:m Taeodogo, LLC
5.3 Admixtures
Pozzolan grade fly ash may be substituted for up to 35% of the cement as an aid
to pumpability. (The pumpability of fine aggregate concrete mixes containing
course sand is improved by the addition of fly ash.) Grout fluldther, water
reducing or set time controlling agents may be used as recommended by their
manufacturers to Improve the pumpability and set time of the fine aggregate
concrete.
5.4 Ready -Mix
Fine aggregate concrete should be pre -mixed at a concrete batch plant and
delivered by ready -mix trucks to the job site. If a continuous supply of concrete
cannot be assured a reserve of concrete should be maintained In a holding
hopper equipped with an agitator. The consistency of the Me aggregate concrete
delivered to the job site should be maintained in the 9-11 second range when
passed through the 0.75 inch orifice of the standard flow cone, that is described
In ASTM D 6449 (Fig. 1). Tests Utilizing a concrete slump cone are not
appropriate.
5.5 Components
Portland cement should conform to ASTM C 150, Type I or II.
Fine aggregate should conform to ASTM C 33, except as to grading. Aggregate
grading should be reasonably consistent and should not exceed the maximum
size which can be conveniently handled with available pumping equipment.
Water for mixing should be dean and free from injurious amounts of oil, alkali,
organic matter or other deleterious substances.
Pozzolan, H used should conform to ASTM C 618, Class C. F or N.
Plasticizing and air entraining admixtures, if used, should conform to ASTM C
494 and ASTM C 260, respectively.
6.0 ENVIRONMENTAL COMPATIBILITY
When fine a re ate cote Is um into the fabric forms an average of 0.25% of
the OR
cncref0
content (with a maxim of 0.5%) is lost through the fabric farms, or the
equivalent of approximately 2000 g of cement to a cubic yard of conorem pumped. The
addition of 40 g of cement to a cubic yard of water will raise the pH value of water
approximately 1.0. This should fall well within the nominal pH range (7.O to 9.5) of
potable water. The following procedures, should assure that the has in pH during fine
aggregate concrete pumping of fabric formed linings, mats or armor units will not exceed
1.0:
• In stagnant water, the total volume of water must be at least 50 times the
volume of fine aggregate concrete pumped.
• In flowing water, the rale of water flow in cubic yards per minute must exceed
the rote of tine aggregate concrete pumped in cubic yards per hour.
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7.0 INSTALLATION
7.1 Site Preparation
Slope grading equipment Is used to excavate to required depths, contour the
Slopes to the s ifled slope ratio and form the anchor, toe and terminal trenches
P Pec
round theperipheryof the installation. The area to be protected must be tree of
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rock, brush, Dols r large soil clods. Ercoform TM should be placed on a
compacted sub -grade and stable slope. The fabric forms am usually anchored
into a trench 3 to 5 feet deep, by 3 feet wide, at the top of the slope.
7.2 Panel Placement and Field Assembly
Once the slope and other related excavation conforms to finished grade and
elevation specifications, Installation of the filler fabric and the Ercoforn - fabric
forms may begin. Atter a site specific fitter fabric has been Installed, the custom
sized Erooform ,M panels are rolled down the slope and positioned for unfolding.
The panels are positioned according to prepared drawings where each panel is
identified for placement. The anal is Nen unfolded b a work crew and pulled
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into position. The Ercotorm panels should be positioned loosely along the
slope. Once positioned, the upper ed of the panel is folded into the anchor
P Pos extra
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wench oto the slope. The extra fabric provided for contraction duan pumping
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should be accumulated and held at the top of the slope and gradually released
as the panel is filled. If field modifications are required, adjacent panels are
joined by field sewing or zippering the double layer fabric forms, bottom layer to
bottom layer, and top layer to top layer. During field modifications/additions,
transverse revelment cables should be spliced together prior to joining of the top
layers of fabric.
7.3 Inspection Before Filling
When Inspecting the panels prior to pumping, wrinkles and loose fabric should be
expected as they are necessary to compensate for form contraction. As much as
10% contraction in each direction may be expected during the filling process. All
field sewn seams. zipper connections and lap joints must be carefully inspected
to assure that no holes in the forms are present. Colored thread Is advised for all
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field sewseams to facilitate inspection.
7.4 Structural Grout Pumping
The upper edge of the Emoform r' panel that has been placed into the anchor
trench should be weighted down with sandbags to prevent the panel from sliding
down the slope as it is pumped with grout. Grout should then be injected into the
lower mat area first, proceeding gradually up the slope and into the upper anchor
trench until the entire panel has been filled. Structural grout is injected into the
Ercofonn TM panels by inserting a 3- diameter grout hose through a small slit cut
in the upper layer of fabric near the top of the slope. A grout tight seal is formed
by wrapping the injection hose with burlap, or similar material, while the grout is
being injected. When the hose is withdrawn, the burlap is stuffed into the hole
where it remains until the grout is no longer fluid. The burlap is then removed and
the concrete surface at the hole is smoothed by hand.
III
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