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Salt Water Sill in Saint Charles Parish, Louisiana
NAME OF APPLICANT: Saint Charles Parish Government ℅ Moffatt Nicol,
Attn: Chris Williams, 301 Main Street, Suite 800, Baton Rouge, Louisiana, 70825.
LOCATION OF WORK: Beneath the Interstate 10 (I-10) bridge at the convergence of the I-10 spoil canal and Duncan Canal, near Kenner, Louisiana, in Saint Charles Parish, as shown on the enclosed drawings.
Hydrologic Unit Code: 08090301 - Eastern Central Louisiana Coastal
Latitude: 30.0066, Longitude: -90.28027
CHARACTER OF WORK: The applicant proposes to install Envirotubes filled with 465 cubic yards of sand material of varying circumferences (6 inches to 30 inches) across the I-10 spoil canal to serve as a salt water sill. The salt water sill would be constructed to an elevation of +2.75 feet (NAVD 88) and restrict salt water from entering into the LaBranche Wetlands via the I-10 borrow canal. The Envirotubes will be placed on top of the existing rock rip rap sill, which was installed in 1987, and has since subsided to the point where it is no longer functioning as intended.
Envirotubes are a geotextile tubular fabric used for water management activities. A barge mounted hopper would be utilized for installation at the site. No wetland impacts are anticipated with the placement of the Envirotubes; thus, no compensatory mitigation measures are proposed at this time.
JOINT PUBLIC NOTICE
June 8, 2015
United States Army
Corps of Engineers
New Orleans District
Regulatory Branch
Post Office Box 60267
New Orleans, Louisiana 70160-0267
State of Louisiana
Department of Environmental Quality
ATTN: Water Quality Certifications
Post Office Box 4313
Baton Rouge, Louisiana 70821-4313
(504) 862-2225
Brad.LaBorde@usace.army.mil
Project Manager
Brad LaBorde
Permit Application Number
MVN 2015-0893 EOO
(225) 219-3225
Project Manager
Elizabeth Johnson
WQC Application Number
WQC 150603-02
Interested parties are hereby notified that a permit application has been received by the New
Orleans District of the U.S. Army Corps of Engineers pursuant to: [X] Section 10 of the Rivers and
Harbors Act of March 3, 1899 (30 Stat. 1151; 33 USC 403); and/or [X] Section 404 of the Clean
Water Act (86 Stat. 816; 33 USC 1344).
Application has also been made to the Louisiana Department of Environmental Quality, Water
Quality Certifications, for a Water Quality Certification (WQC) in accordance with statutory authority
contained in LRS30:2047 A(3), and provisions of Section 401 of the Clean Water Act (P.L.95-17).
Salt Water Sill in Saint Charles Parish, Louisiana
NAME OF APPLICANT: Saint Charles Parish Government Moffatt Nicol,
Attn: Chris Williams, 301 Main Street, Suite 800, Baton Rouge, Louisiana, 70825.
LOCATION OF WORK: Beneath the Interstate 10 (I-10) bridge at the convergence of the I-10 spoil
canal and Duncan Canal, near Kenner, Louisiana, in Saint Charles Parish, as shown on the enclosed
drawings.
Hydrologic Unit Code: 08090301 - Eastern Central Louisiana Coastal
Latitude: 30.0066, Longitude: -90.28027
CHARACTER OF WORK: The applicant proposes to install Envirotubes filled with 465 cubic yards of
sand material of varying circumferences (6 inches to 30 inches) across the I-10 spoil canal to serve
as a salt water sill. The salt water sill would be constructed to an elevation of +2.75 feet (NAVD 88)
and restrict salt water from entering into the LaBranche Wetlands via the I-10 borrow canal. The
Envirotubes will be placed on top of the existing rock rip rap sill, which was installed in 1987, and has
since subsided to the point where it is no longer functioning as intended.
Envirotubes are a geotextile tubular fabric used for water management activities. A barge mounted
hopper would be utilized for installation at the site. No wetland impacts are anticipated with the
placement of the Envirotubes; thus, no compensatory mitigation measures are proposed at this time.
-2The comment period for the Department of the Army Permit and the Louisiana Department of
Environmental Quality WQC will close 20 days from the date of this joint public notice. Written
comments, including suggestions for modifications or objections to the proposed work, stating
reasons thereof, are being solicited from anyone having interest in this permit and/or this WQC
request and must be mailed so as to be received before or by the last day of the comment period.
Letters concerning the Corps of Engineers permit application must reference the applicant's name
and the Permit Application Number, and be mailed to the Corps of Engineers at the address above,
ATTENTION: REGULATORY BRANCH. Individuals or parties may request an extension of time
in which to comment on the proposed work by writing or e-mailing the Corps of Engineers
Project Manager listed above. Any request must be specific and substantively supportive of
the requested extension, and received by this office prior to the end of the initial comment
period. The Section Chief will review the request and the requestor will be promptly notified of
the decision to grant or deny the request. If granted, the time extension will be continuous to
the initial comment period and, inclusive of the initial comment period, will not exceed a total
of 30 calendar days.
The application for this proposed project is on file with the Louisiana Department of Environmental
Quality and may be examined during weekdays between 8:00 a.m. and 4:30 p.m. Copies may be
obtained upon payment of costs of reproduction.
Corps of Engineers Permit Criteria
The decision whether to issue a permit will be based on an evaluation of the probable impacts,
including cumulative impacts of the proposed activity on the public interest. That decision will reflect
the national concern for both protection and utilization of important resources. The benefit which
reasonably may be expected to accrue from the proposal must be balanced against its reasonably
foreseeable detriments. All factors which may be relevant to the proposal will be considered including
the cumulative effects thereof; among those are conservation, economics, aesthetics, general
environmental concerns, wetlands, historic properties, fish and wildlife values, flood hazards,
floodplain values, land use, navigation, shoreline erosion and accretion, recreation, water supply and
conservation, water quality, energy needs, safety, food and fiber production, mineral needs,
considerations of property ownership and, in general, the needs and welfare of the people.
The U.S. Army Corps of Engineers is soliciting comments from the public, federal, state, and local
agencies and officials, Indian Tribes, and other interested parties in order to consider and evaluate
the impacts of this proposed activity. Any comments received will be considered by the U.S. Army
Corps of Engineers to determine whether to make, modify, condition, or deny a permit for this
proposal. To make this decision, comments are used to assess impacts on endangered species,
historic properties, water quality, general environmental effects, and other public interest factors listed
above. Comments are used in the preparation of an Environmental Assessment and/or an
Environmental Impact Statement pursuant to the National Environmental Policy Act. Comments are
also used to determine the need for a public hearing and to determine the overall public interest of the
proposed activity.
The New Orleans District is unaware of properties listed on the National Register of Historic
Places near the proposed work. The possibility exists that the proposed work may damage or
destroy presently unknown archeological, scientific, prehistorical, historical sites, or data. Issuance of
this public notice solicits input from the State Archeologist and State Historic Preservation Officer
regarding potential impacts to cultural resources.
-3The New Orleans District has determined that the project footprint is located in waters known to
be utilized by the West Indian manatee (Trichechus manatus) and determined the activity is "not likely
to adversely affect" this species based on the Standard Local Operating Procedure for Endangered
Species in Louisiana (SLOPES), dated October 22, 2014, between the U.S. Army Corps of
Engineers, New Orleans and U.S. Fish and Wildlife Service, Ecological Services Office. If authorized,
"The Standard Manatee Conditions for In-Water Activities" will be made part of the permit's special
conditions.
Department of Interior. Our initial finding is that the proposed work is "not likely to adversely affect"
the West Indian manatee. Concurrence has been received from the U.S. Fish and Wildlife Service per
the Standard Local Operating Procedure for Endangered Species in Louisiana, dated
October 22, 2014.
This notice initiates the Essential Fish Habitat (EFH) consultation requirements of the MagnusonStevens Fishery Conservation and Management Act. The applicant's proposal would result in the
destruction or alteration of 0.1 acres of EFH utilized by various life stages of red drum and penaeid
shrimp. Our initial determination is that the proposed action would not have a substantial adverse
impact on EFH or federally managed fisheries in the Gulf of Mexico. Our final determination relative
to project impacts and the need for mitigation measures is subject to review by and coordination with
the National Marine Fisheries Service.
If the proposed work involves deposits of dredged or fill material into navigable waters, the
evaluation of the probable impacts will include the application of guidelines established by the
Administrator of the Environmental Protection Agency. Also, a certification that the proposed activity
will not violate applicable water quality standards will be required from the Department of
Environmental Quality, Water Quality Certifications, before a permit is issued.
Any person may request, in writing, within the comment period specified in this notice, that a
public hearing be held to consider this application. Requests for public hearings shall state, with
particularity, the reasons for holding a public hearing.
The applicant has certified that the proposed activity described in the application complies with
and will be conducted in a manner that is consistent with the Louisiana Coastal Resources Program.
The Department of the Army permit will not be issued unless the applicant received approval or a
waiver of the Coastal Use Permit by the Department of Natural Resources.
You are requested to communicate the information contained in this notice to any other parties
whom you deem likely to have interest in the matter.
Michael V. Farabee
Chief, Eastern Evaluation Section
Enclosure
PREPARED FOR:
ST CHARLES PARISH COALITION TO RESTORE COASTAL LOUISIANA
AND PONTCHARTRAIN LEVEE DISTRICT
LaBRANCHE SALINITY BARRIER
UP
LE PER
VE G
U
E
RO IDE
AD
SAINT CHARLES PARISH, LOUISIANA
LAKE PONTCHARTRAIN
LO
LE WE
VE R G
E
RO UID
AD E
WETLAND
WATCHERS
PARK
PROJECT ACCESS
SEE SHEET 7
STATE OF LOUISIANA
INSET MAP
LaBRANCHE WETLANDS
PROJECT LOCATION
LOUIS ARMSTRONG
NEW ORLEANS INT'L
AIRPORT
MIS
S
ISS
IPP
I RIV
ER
BY
DESCRIPTION
DATE
PREPARED FOR:
ST CHARLES PARISH
COALITION TO RESTORE COASTAL LOUISIANA
AND PONTCHARTRAIN LEVEE DISTRICT
LaBRANCHE
SALINITY BARRIER
TITLE SHEET
DATE: JANUARY, 2015
DRAWN BY: YC
DESIGNED BY: SA
APPROVED BY: XXXXXX
SHEET 1
OF
7
SURVEY NOTES:
INDEX TO DRAWINGS
1.
SHEET
No.
1.
2.
3.
4.
5.
6.
7.
SURVEY PERFORMED IN JUNE 2014 BY:
LIN FIELD, HUNTER AND JUNIUS, INC.
3608 18TH STREET, SUITE 200
METAIRIE, LA 70002
(504)833-5300
2.
SURVEY VERTICAL DATUM = NORTH AMERICAN VERTICAL DATUM OF
1988 (NAVD 88).
3.
SURVEY HORIZONTAL DATUM = STATE PLANE - NORTH AMERICAN
DATUM OF 1983 (NAD 83), LOUISIANA SOUTH ZONE, US SURVEY FEET.
4.
CONTOUR INTERVAL SHOWN IS 0.5 FEET.
5.
SURVEY CONTROL USED 2 COE IRON RODS THAT ARE THE 2 MAIN
CONTROL POINTS FOR THE LAKE PONCHARTRAIN REACH 2 BERM
PROJECT. THE HORIZONTAL COORDINATES ARE NAD 83 LOUISIANA
STATE PLANE SOUTH (1702), AND THE VERTICAL IS NAVD 88 (2004.65
EPOCH). THE POINTS ARE STILL EXISTING AND IN GOOD CONDITION:
IR NAME
07-050C-3
07-050C-4
NORTHING
558,504.625
560,958.700
DESCRIPTION
TITLE SHEET
NOTES AND INDEX OF DRAWINGS
EXISTING CONDITION
SALT BARRIER PLAN
SILL PROFILE
TYPICAL SECTIONS
DETAILS
GEOTECHNICAL CORES:
EASTING
3,633,632.769
3,624,963.652
ELEV
-5.640
-4.980
TWO
GEOTECHNICAL
CORES
WERE
COLLECTED. COORDINATES OF THE CORES
ARE PROVIDED IN THE TABLE BELOW. THE
LOCATIONS ARE SHOWN ON SHEET 3.
ID
NORTHING
EASTING
B-1
549,564.05
3,614,017.09
B-2
549,408.02
3,614,071.11
CONSTRUCTION NOTES:
BY
DESCRIPTION
1.
STRUCTURE LIMITS SHOWN ARE APPROXIMATE AND MAY BE ADJUSTED
TO MEET CURRENT FIELD CONDITION AND CONSTRUCTION
REQUIREMENTS.
2.
ESTIMATED AREA COVERED BY SILL IS 0.16 ACRE.
3.
ALL CONSTRUCTION ACTIVITIES SHALL BE PERFORMED FROM THE
WATER.
4.
QUANTITIES AND AREAS SHOWN ON THE PLANS ARE BASED ON
CONDITION SURVEYED.
5.
LOCATION OF SILL SHALL BE STAKED BY THE CONTRACTOR AND
APPROVED BY THE RESIDENT PROJECT REPRESENTATIVE.
DATE
PREPARED FOR:
ST CHARLES PARISH
COALITION TO RESTORE COASTAL LOUISIANA
AND PONTCHARTRAIN LEVEE DISTRICT
LaBRANCHE
SALINITY BARRIER
NOTES AND INDEX OF
DRAWINGS
DATE: JANUARY, 2015
DRAWN BY: YC
DESIGNED BY: SA
APPROVED BY: XXXXXX
SHEET 2
OF
7
LEGEND
EXISTING CONTOUR MAJOR
PARISH LINE
CANAL
LaBRANCHE WETLAND
EXISTING CONTOUR MINOR
PARISH BOUNDARY
EXISTING ROCK SILL
B-1
4+65
EXISTING SOIL BORINGS
(EUSTIS 2014)
NOTE:
BACKGROUND AERIAL IMAGE FROM
USGS - HIGH RESOLUTION
ORTHOIMAGERY, APRIL OF 2012
PARISH BOUNDARY
BASELINE WP# 2
N 549,675.12
E 3,614,080.35
4+00
APPROX. LOCATION
OF EXIST. ROCK SILL
B-1
ND
3+00
WEST BOU
B-2
2+00
ND
EAST BOU
1+00
BASELINE WP# 1
N 549,175.35
E 3,614,095.42
BASELINE
JEFFERSON PARISH
0+00
100'
ST. CHARLES PARISH
BY
DESCRIPTION
DATE
0'
100'
200'
PREPARED FOR:
ST CHARLES PARISH
COALITION TO RESTORE COASTAL LOUISIANA
AND PONTCHARTRAIN LEVEE DISTRICT
LaBRANCHE
SALINITY BARRIER
EXISTING CONDITION
DATE: JANUARY, 2015
DRAWN BY: YC
DESIGNED BY: SA
APPROVED BY: XXXXXX
SHEET 3
OF
7
END PROJECT
LEGEND
EXISTING CONTOUR MAJOR
LaBRANCHE WETLAND
PARISH LINE
CANAL
A
5
EXISTING CONTOUR MINOR
PARISH BOUNDARY
EXISTING ROCK SILL
PROPOSED
BARRIER
4+65
PROPOSED BARRIER
PARISH BOUNDARY
PROPOSED DREDGE AREA
4+00
WORKING POINT
NOTE:
BACKGROUND AERIAL IMAGE FROM
USGS - HIGH RESOLUTION
ORTHOIMAGERY, APRIL OF 2012
APPROX. LOCATION
OF EXIST. ROCK SILL
3+00
ND
WEST BOU
465'-0"
1
B
6
2+00
D
EAST BOUN
LIMIT OF ROCK
FOUNDATION
JEFFERSON PARISH
1+00
0+00
BEGIN
PROJECT
100'
ST. CHARLES PARISH
BY
DESCRIPTION
DATE
0'
100'
200'
PREPARED FOR:
ST CHARLES PARISH
COALITION TO RESTORE COASTAL LOUISIANA
AND PONTCHARTRAIN LEVEE DISTRICT
LaBRANCHE
SALINITY BARRIER
SALT BARRIER PLAN
DATE: JANUARY, 2015
DRAWN BY: YC
DESIGNED BY: SA
APPROVED BY: XXXXXX
SHEET 4
OF
7
LEGEND
EXISTING GRADE
FINISHED GRADE
REMAINS OF EXISTING SILL
SHORE LINK
EXISTING SILL ARTICULATED MAT
SHORE LINK OR APPROVED EQUAL (TYP.)
16
14
12
10
8
6
4
2
0
-2
-4
-6
-8
1+00
16
14
12
10
8
6
4
2
0
-2
-4
-6
-8
I-10
(WESTBOUND)
MHHW= 1.0'
MLLW= 0.55'
0+50
EXISTING GRADE (REMAINS
OF EXISTING SILL)
22.5' CIRCUMFERENCE ENVIROTUBE,
SEE CROSS SECTION 'B' ON SHT. 6
I-10
(EASTBOUND)
0+00
EXISTING SILL ARTICULATED MAT
EXISTING ROCK SILL
1+50
2+00
A
4
2+50
3+00
3+50
4+00
4+50
5+00
SILL PROFILE
12'
0'
12'
24'
60'
0'
60'
120'
VERT:
HOR:
BY
DESCRIPTION
DATE
PREPARED FOR:
ST CHARLES PARISH
COALITION TO RESTORE COASTAL LOUISIANA
AND PONTCHARTRAIN LEVEE DISTRICT
LaBRANCHE
SALINITY BARRIER
SILL PROFILE
DATE: JANUARY, 2015
DRAWN BY: YC
DESIGNED BY: SA
APPROVED BY: XXXXXX
SHEET 5
OF
7
CONTRACTOR SHALL SEW 22.5' CIR TUBE TO
GEOTEXTILE WHICH FORMS STABILIZATION TUBES.
CONTRACTOR TO PROVIDE SHOP DRAWINGS ON
HOW GEOTEXTILE TUBES WILL BE ASSEMBLED.
8' WIDE GREEN ARMOR SYSTEM
5
GEOTEXTILE
MLLW= +0.55'
0
MHHW= +1.0'
EL. +0.5'
0
EL. -1.0'
EXISTING GRADE
(EL. VARIES)
EXISTING SILL
9.0'
-5
-5
-8
-8
B
4
TYPICAL SECTION
ELEVATION (FEET NAVD 88)
8' WIDE GREEN ARMOR SYSTEM ENKAMAT
7020 OR APPROVED EQUAL CONTRACTOR
TO FILL VOIDS IN MAT WITH IN-SITU SOILS
SHORE LINK OR
APPROVED EQUAL
TO CLOSE OPENING
5
5
EL. +2.75'
MHHW= +1.0'
EXISTING BANK
MLLW= +0.55'
EXISTING
ARTICULATED
SILL MAT
0
EXISTING GRADE
-5
C
5
DESCRIPTION
0
30' CIRCUMFERENCE
ENVIROTUBE
-5
BY
5
EL. +2.75'
(2) 6' CIRCUMFERENCE ENVIROTUBES
45"
(APPROX.)
ELEVATION (FEET NAVD 88)
22.5' CIRCUMFERENCE ENVIROTUBE
DATE
END DETAIL
5'
0'
5'
10'
PREPARED FOR:
ST CHARLES PARISH
COALITION TO RESTORE COASTAL LOUISIANA
AND PONTCHARTRAIN LEVEE DISTRICT
LaBRANCHE
SALINITY BARRIER
TYPICAL SECTIONS
DATE: JANUARY, 2015
DRAWN BY: YC
DESIGNED BY: SA
APPROVED BY: XXXXXX
SHEET 6
OF
7
LAKE
PONCHARTRAIN
PROJECT LOCATION
5
5.5
5.5
6
7
6
8
8
9
9
10
10
PARISH LINE CANAL
#
BY
DESCRIPTION
- SOUNDING DEPTH
500'
DATE
0'
500'
1000'
PREPARED FOR:
ST CHARLES PARISH
COALITION TO RESTORE COASTAL LOUISIANA
AND PONTCHARTRAIN LEVEE DISTRICT
LaBRANCHE
SALINITY BARRIER
PROJECT ACCESS
DATE: JANUARY, 2015
DRAWN BY: YC
DESIGNED BY: SA
APPROVED BY: XXXXXX
SHEET 7
OF
7