W912P818B0040_AM00001.pdf

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER (Type or print)

30-105-04EXCEPTION TO SF 30

APPROVED BY OIRM 11-84

STANDARD FORM 30 (Rev. 10-83) Prescribed by GSA

FAR (48 CFR) 53.243

The above numbered solicitation for Mississippi River, Baton Rouge to the Gulf, Head of Passes, Hopper Dredge Disposal Area Project (#18-1), Plaquemines Parish, Louisiana ED18-017 is hereby amended to provide responses to a request for information and make changes as shown on the following pages. The bid opening date and time will remain unchanged by this amendment. There are no other changes.

1. CONTRACT ID CODE PAGE OF PAGES

J 1 4

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

16C. DATE SIGNED

BY

16B. UNITED STATES OF AMERICA15C. DATE SIGNED15B. CONTRACTOR/OFFEROR

(Signature of Contracting Officer)(Signature of person authorized to sign)

8. NAME AND ADDRESS OF CONTRACTOR (No., Street, County, State and Zip Code) X W912P818B0040

X 9B. DATED (SEE ITEM 11)

06-Aug-2018

10B. DATED (SEE ITEM 13)

9A. AMENDMENT OF SOLICITATION NO.

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

X The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offer is extended, X is not extended.

Offer must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended by one of the following methods:

(a) By completing Items 8 and 15, and returning 1 copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN

REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE

CONTRACT ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(B).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

E. IMPORTANT: Contractor is not, is required to sign this document and return copies to the issuing office.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

10A. MOD. OF CONTRACT/ORDER NO.

2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO.(If applicable)

6. ISSUED BY

3. EFFECTIVE DATE

23-Aug-2018

CODE

USACE, CONTRACTING DIVISION

ATTN: CEMVN-CT, ROOM 172

7400 LEAKE AVE.

NEW ORLEANS LA 70118-3651

W912P8 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODECODE

EMAIL:TEL:

AM0001 CHANGES

CONTRACTOR REQUEST FOR INFORMATION RESPONSE

Q : Can you please provide the latest survey data (xyz) for the following areas?

1. HDDA Borrow Site

2. West Bay Marsh Creation Site (AD for recent dredge discharge event?)

3. Sawdust Bend Disposal Site (AD for recent dredge discharge event?)

A : See attached surveys data. Note : Both current and historical survey data have been provided for the HDDA Borrow Site.

SECTION 01100

1. Page 16, paragraph 21. Change the last line of this paragraph to read: See “Comprehensive Evaluation of Project Datums (CEPD) Final Report - Appendix, 1 Mississippi River Ship Channel, Gulf to Baton Rouge at end of this section.

2. Add the attached “Comprehensive Evaluation of Project Datums (CEPD) Final Report – Appendix 1, Mississippi River Ship Channel, Gulf to Baton Rouge” to the end of this Section.

3. Delete pages 17, 18, 1nd 19 in their entirety and substitute the revised attached pages 17, 18, and 19 therefore:

SECTION 02 21 10.00 12

Page 11, paragraph 3.1.7.2. Delete this paragraph in its entirety and substitute the following therefore: “3.1.7.2 Reserved”.

SECTION 35 20 23.00 12

1. Page 3, paragraph 1.1. Delete this paragraph in its entirety and substitute the following therefore:

“1.1 SCOPE

a) The work provided for herein consists of furnishing all plant, labor, materials, and equipment and performing all operations necessary for the removal of all materials to the required dimensions as shown on the contract drawings, satisfactory disposal thereof, and all operations incidental thereto. Under this contract, the Contractor may use either the wetland creation area within the Pass A Loutre Wildlife Refuge or within the New West Bay marsh creation area, or a combination of both. The Delta Wildlife Refuge Disposal Areas are no longer available for usage under this solicitation.

b) If the Contractor elects to dispose of material dredged from the Hopper Dredge Disposal Area (HDDA) site via a temporary pipeline under and across the Mississippi River, then the pipeline must be installed and removed in accordance with the guidelines specified herein and assure that the channel is open at all times for safe navigation. The only exception will be the times that the Contractor will be allowed to work within the navigation channel in order to install and remove the dredge pipeline within the allowable navigation channel limits. This will also require close coordination with the Corps of Engineers, US Coast Guard, River Pilots, and VTS in order to assure safe operations and minimal impacts to navigation.”

2. Page 13, paragraph 3.1.3.2. Delete this paragraph in its entirety and substitute the following therefore: “3.1.3.2 Reserved”.

3. Page 20, paragraph 3.3.1. Delete this paragraph in its entirety and substitute the following therefore:

“3.3.1 General

Material dredged from the HDDA shall be deposited within the Wetland Creation Areas as shown on the contract drawings. Material shall be deposited in such a manner as to create marsh and peninsulas as shown on the contract drawings. Under this contract, the Contractor may use either (1) the West Bay disposal area for marsh creation, or (2) the marsh creation areas within the Pass A Loutre Wildlife Management Area (PALWMA) along South Pass, or some combination thereof. The Contractor shall establish and maintain staff gages throughout the disposal area(s) as needed in order to monitor the elevation of the material for compliance with the plans and specifications. The staff gages shall be marked at one-half foot intervals, extending from water's surface to at least 1-foot above the maximum allowable disposal elevations. The Contractor shall retain earth moving equipment (marsh buggy) within the currently used disposal area for movement of pipeline and construction of retention/deflection dikes as require.

The Contractor shall submit, to the Contracting Officer for review and approval, a plan for the placement of dredged material within the Wetland Creation Areas. This plan shall be submitted a minimum of seven (7) days prior to the commencement of work. This plan shall include placement locations, access locations, and plans for retention of dredged material and for the protection of existing structures and utilities.

In general, areas of existing vegetation and bird nesting colonies shall be excluded from disposal activities, except as otherwise noted on the contract drawings. The Contracting

Officer's Representative reserves the right to adjust the placement of the dredged material to best fit the work.”

4. Page 20, paragraph 3.3.2. Delete this paragraph in its entirety and substitute the following therefore: “3.3.2 Reserved”.

5. Page 21, paragraph 3.3.3. Delete this paragraph in its entirety and substitute the following therefore:

“3..3.3 West Bay Marsh Creation Area

If the Contractor elects to use the West Bay Marsh Creation Disposal site, several requirements as outlined below must be adhered to before, during, and after the dredging operation. If the West Bay Marsh Creation Area is used for disposal, the Contractor shall first utilize the portion of the disposal area south of the BUDMAT Island. With approval of the Contracting Officers Representative that capacity of the southern disposal region has been exhausted, the Contractor may revert disposal operations north of the BUDMAT Island.”

6. Page 27, paragraph 3.3.5. Delete this paragraph in its entirety and substitute the following therefore:

“3.3.5 Flotation Access Dredging for Accessing South Pass Disposal Areas

The Contractor will be allowed to excavate flotation channel access to disposal sites as shown on the contract drawings. Material from the flotation channel dredging shall be stockpiled in shallow open water adjacent to the flotation access channels and used to backfill the flotation access channel prior to final demobilization from the work site. The Contractor may excavate as required for equipment access, but shall not exceed the maximum allowable dimensions.

Maximum dimensions for the flotation access channels shall be -11.5 feet MLLW by 150 foot bottom width.”

DRAWINGS

SHEET IDENTIFICATION (SID) Nos. G-03, C-01, C-03, and C-04. Delete these drawings in their entirety and substitute revised attached drawings SHEET IDENTIFICATION Nos. G-03, C-01, and C-03 therefore (SID C-04 remains deleted).

01100-17 ED 18-017

23. REGULATORY REQUIREMENTS

In addition to the detailed requirements included in the provisions of this contract and the requirements as defined within USACE EM 385-1-1, the Contractor shall comply with all pertinent federal, state, and local laws, ordinances, criteria, rules, and regulations. Submit matters of interpretation of standards to the appropriate administrative agency for resolution before starting work. Where the requirements of this specification, applicable laws, criteria, ordinances, regulations and referenced documents vary, the most stringent requirements shall apply.

24. PERMIT CONDITIONS

South Pass Disposal Areas - Pass A Loutre Wildlife Management Area (PALWLMA).

A Right-of-Entry (ROE) has been obtained from the Louisiana Department of Wildlife and Fisheries (LDWF) for ingress and egress, as well as to perform maintenance dredging, disposal and related activities within the Pass A Loutre Wildlife Management Area (PALWLMA). Compliance with the following conditions will be required:

(1) If the Contractor should elect to use disposal sites on the PALWLMA, the COR shall provide the LDWF with a detailed plan outlining dredging schedules, disposal sites proposed to be used, types of equipment needed, schedules of equipment use, and schedules of project implementation at least two weeks in advance of any activities on PALWMA. In addition, USACE shall provide the LDWF with copies of all pre-project and post project data (elevation/bathymetry information, acreage of marsh created, cut/fill material quantities, etc.). All correspondence shall be sent to Vaughan McDonald at vmcdonald@wlf.la.gov and Todd Baker at todd.baker@la.gov.

(2) Following the above mentioned two week notification period, a preconstruction meeting shall be held with LDWF and include the USACE project inspector (COR), the dredging contractor, and any other USACE decision makers for this project. Meeting coordination shall be through LDWF contact Vaughan McDonald at vmcdonald@wlf.la.gov or Todd Baker at todd.baker@la.gov.

(3) Any and all construction activities on PALWMA including but not limited to dredging areas, access corridors, flotation channel excavations, pipeline corridors, dike construction, buffer areas, fill elevations, etc. shall be performed as depicted on the contract drawings. If any activities extend beyond or outside the locations depicted in the drawings, the USACE shall immediately notify LDWF via email to Vaughan McDonald at vmcdonald@wlf.la.gov. LDWF and USACE will then meet to discuss how to address the work that is outside of the scope of work detailed in the drawings. Any additional work proposed on PALWMA must be approved by LDWF.

01100-18 ED 18-017

(4) LDWF prefers not to restrict public access on PALWMA. Therefore, the LDWF must approve any requests for closures of waterways in writing. A request for closures of waterways shall be submitted to LDWF staff at least two weeks in advance of the need of the closure(s).

(5) The USACE, its contractors, agents, employees and representatives must follow the rules and regulations of PALWMA. These regulations prohibit the use airboats at any time and mud-boat use after 2:00 pm from September 1 through January 31. LDWF will issue separate conditional permits upon request to allow the use of airboats and/or mud-boats in direct support of this project. LDWF will condition these permits to limit disturbance to waterfowl and to recreational users of the PALWMA during peak periods, particularly during the months of September, November, December, and January. A request for an airboat/mudboat permit should be made at least one week prior to the need of the vessel, but should be made with as much advanced notice as possible to allow adequate time for permit processing. Requests should be made via e-mail to Vaughan McDonald at vaughan.mcdonald@la.gov.

(6) USACE must coordinate with LDWF regarding the overnight mooring of quarter barges, equipment barges, tugboats, crewboats, etc. and the staging of floating discharge pipe on PALWMA. LDWF reserves the reasonable right to select the locations for mooring and staging of this type of equipment. LDWF also requires all floating structures to be illuminated with flashing hazard lights during night time hours. All submerged pipelines and emergent pipelines in open water must also be marked with lighting to alert boaters of the potential hazards.

(7) Colonial nesting seabirds and wading birds (including, but not limited to, terns, gulls, black skimmers, egrets, herons, and pelicans) should be avoided to reduce the risk of injuring birds. The nesting activity period generally extends from February 15 through September 15. A visual inspection of the project area for nesting birds will be made prior to startup of work by qualified personnel from the USACE and LDWF. Presence of nesting wading birds and/or seabirds must be immediately reported to LDWF by the project inspector. This action will trigger an additional coordination between LDWF and USACE to perform such activities necessary to identify the nesting birds and initiate any necessary project modification(s) that would avoid disturbance to these birds and their nests. If nests of these birds are present on the work area, a “no-work” distance restriction of 650 feet for terns, gulls, and black skimmers, 1,000 feet for colonial nesting and wading birds, and 2,000 feet for brown pelicans must be implemented.

Further coordination by USACE with the U.S. Fish and Wildlife Service may result in a further reduction of “no-work distance restrictions” depending on the species of birds found nesting at the work site.

(8) A copy of these Right of Entry conditions shall be kept on the job site at all times during this project.

01100-19 ED 18-017

(9) Regular progress meetings between USACE and LDWF staff will be held on site during construction of the project. Additional meetings may be required by LDWF if problems arise.

(10) All equipment used in connection with the project must be removed upon project completion.

(11) Upon completion of the project, a final inspection and/or post-project meeting may be required by LDWF. The meeting would be comprised of PALWMA staff, the contractor, and a representative from USACE to ensure that all stipulations have been adhered to.

(12) In the event the above stipulations are not met, LDWF shall notify the USACE in writing of the infraction. The USACE will have two weeks to rectify the infraction or develop a mitigation plan suitable to LDWF. If no resolution is reached LDWF may cancel this Right of Entry.

(13) The USACE Contractor shall use reasonable care to avoid damage to PALWMA while conducting maintenance dredging operations. The United States has waived sovereign immunity for negligence in the Federal Tort Claims Act, 28 U.S.C. 1346, 2671-2680, and the Department of the Army acknowledges that in the event its employees are negligent, liability may attach for such negligence under the Federal Tort Claims Act. At LDWF’s discretion, the USACE and its Contractor may be asked to repair, or restore to the pre-project condition, any canals, ditches, levees, signs, pilings, or other structures on the PALWMA which are damaged due to the negligence of USACE or its contractors during dredging activities. USACE may be asked to have dredged to their pre-project condition, any waterways (bayous, passes, cuts, canals, trenasses, etc.) that are filled in as a result of the negligence of USACE or its Contractors in the dredging operations. USACE reserves the right to either undertake the performance of any repairs, restoration, or dredging requested by LDWF; or to dispute USACE’s liability for any alleged damages to PALWMA; or to enter into a settlement agreement with LDWF. In no event shall the costs of the repairs, restoration, or dredging, or the financial amount of the settlement, exceed the fair market value of the fee title to the damaged real property at the time immediately preceding the damage. USACE’s liability under this paragraph is subject to availability of appropriations to make any such repairs, restoration, dredging, or payment, and nothing contained in this agreement shall be construed to imply that Congress will appropriate sufficient funds to meet any deficiencies at a later date.

Comprehensive Evaluation of Project Datums (CEPD) Final Report - Appendix 1

Mississippi River Ship Channel, Gulf to Baton Rouge

Date: 18 December 2013

Updated: 10 July 2015

CEMVN-ED-SS

Mississippi River Ship Channel, Gulf to Baton Rouge

Project Map (1 of 2)

Mississippi River Ship Channel, Gulf to Baton Rouge

Project Map (2 of 2)

Section 1: Purpose:

This CEPD effort was originally done in order to bring the Mississippi River Ship Channel, Gulf to Baton Rouge, project into compliance with the requirements outlined in EM 1110-2-6056, Standards and Procedures for Referencing Project Elevation Grades to Nationwide Vertical Datums. This engineering manual was released in response to the study performed by the “Interagency Performance Evaluation Taskforce” (IPET) and the resulting Lessons Learned, in order to address datum and project control issues.

This report was updated in 2015 in order to update the datum relationships in the Southwest Pass project area, incorporating published updates to the geodetic and tidal datums. This is described in more detail in Section 2.

As a result of this effort there are several project benchmarks that have been identified as project control, and the appropriate tidal / hydraulic references have been updated. This effort was comprised of several Survey Section (ED-SS) jobs, as referenced below:

Survey Job No Job Title 10-009S Mississippi River Area 1 – survey 10-042S Mississippi River Area 2 – survey 10-043C Mississippi River Area 3/4 – survey 10-133C CEPD Tidal Calculations 10-170S Survey of Mean Low Gulf staff gages 13-083C Mississippi River Gages, CEPD 14-035G CEPD Control Update

Section 2: Tidal / Hydraulic Datum Summary

Each USACE gage listed on Tables 1-3 were surveyed from an existing or newly established benchmark that is included in the National Spatial Reference System (NSRS) database. Gage corrections were determined that can be applied to the raw gage readings to adjust to the North American Vertical Datum of 1988 (NAVD88). Two additional benchmarks were also included in the gage surveys, in order to have three benchmarks associated with every gage. Future gage inspections will use all three benchmarks in order to verify the primary gage benchmark has not been disturbed.

Mean Lower Low Water (MLLW) – NAVD88 relationships have been determined at two tide stations published by the National Oceanic and Atmospheric Administration (NOAA):

Pilottown (Station 8760721), and Pilots Station East (Station 8760922). These stations are located near USACE gages 01525 and 01670, respectively, so these relationships will be referenced at the USACE gages. These MLLW – NAVD88 relationships are referenced to the 2007-2011 modified tidal datum epoch.

The Mean Low Gulf (MLG) – NAVD88 relationships have been determined based on surveys of staff gages that were previously set to MLG. Documentation of the MLG determinations can be found with ED-SS job 14-035G.

Due to regional subsidence and global sea-level rise, the elevations of the referenced benchmarks and the tidal datum values at the referenced gages (as well as the datum relationships) are time-dependant and subject to change. Therefore, the information contained in this report shall be updated on a regular basis and/or as new information becomes available.

Table 1 provides the datum relationships at the gages that are currently used by Operations Division to maintain the SOUTHWEST PASS project area. All gages were set to NAVD88 (2009.55) in 2015, except for USACE gage 01625 which is referenced to NAVD88 (OPUS 2014) using GEOID12A.

TABLE 1

Datum Relationships for Southwest Pass Gages

Gage ID Gage Name Datum Relationship

01480 Mississippi River at Venice 0' NAVD88 = (-) 0.30' MLLW = 3.20' MLG 01525 Mississippi River at Pilottown 0' NAVD88 = (-) 0.30' MLLW = 3.20' MLG 01545 Mississippi River at Head of Passes 0' NAVD88 = (-) 0.18' MLLW = 3.32' MLG 01575 Southwest Pass at Mile 7.5 0' NAVD88 = 0.17' MLLW = 3.67' MLG 01625 Southwest Pass at Light 14 0' NAVD88 = 0.39' MLLW = 3.89' MLG 01670 Southwest Pass at East Jetty 0' NAVD88 = 0.68' MLLW = 4.18' MLG

NOTES:

MLLW is referenced to the 2007-2011 modified tidal datum epoch.

NAVD88 is referenced to NAVD88 (2009.55) at all locations, except for USACE gage 01625 which is referenced to NAVD88 (OPUS 2014) using GEOID12A.

Table 2 provides the gage corrections for the gages currently used by Operations Division to maintain the SOUTHWEST PASS project area. All gage readings are referenced to NAVD88, but the corrections provided in this table can be used to adjust these gage readings to MLG or

MLLW (2007-2011).

TABLE 2

Gage Corrections for Southwest Pass Gages

Gage Corrections

Gage

ID

Gage Name Gage

Datum

/ MLG

Gage Datum

/ MLLW

Latitude Longitude

01480 Mississippi River at Venice 3.20 -0.30 29 16 19.7 89 21 07.6 01525 Mississippi River at Pilottown 3.20 -0.30 29 10 42.9 89 15 31.8 01545 Mississippi River at Head of Passes 3.32 -0.18 29 08 37.0 89 15 07.0 01575 Southwest Pass at Mile 7.5 3.67 0.17 29 03 41.5 89 18 39.4 01625 Southwest Pass at Light 14 3.89 0.39 29 00 08.0 89 21 04.9 01670 Southwest Pass at East Jetty 4.18 0.68 28 55 56.4 89 24 26.2

Figures shown on page 7-8 show the datum relationships that were determined for USACE gages 01480 and 01670. These values are valid as of the date of this report. Refer to Section 4 to see the results of the surveys and datum analysis.

FIGURE 1

Datum Relationships for USACE Gage 01480

(applied to depths)

FIGURE 2

Datum Relationships for USACE Gage 01480

(applied to a water surface reading)

FIGURE 3

Datum Relationships for USACE Gage 01670

(applied to depths)

FIGURE 4

Datum Relationships for USACE Gage 01670

(applied to a water surface reading)

Section 3: Project Benchmarks

The project benchmarks referenced below have been incorporated into the National Spatial Reference System database and are designated for use for this project:

DESIGNATION: ABLMS 434

PID: DH3192

STATE/COUNTY: LA/WEST BATON ROUGE

LAT/LON: N 30 25 46.08538 W 091 12 25.67566 NAD83 (2011)

NORTH/EAST: N 701,701.84 E 3,320,608.02 SPC LA S (US feet) ELEVATION: 49.44 feet NAVD88 (2004.65) ELEVATION: 49.21 feet NAVD88 (2006.81) ELEVATION: 49.04 feet NAVD88 (OPUS 2010 / GEOID12A)

MARKER: SURVEY DISK

STAMPING: ABLMS 434

DESCRIPTION: THE STATION IS LOCATED IN WEST BATON ROUGE PARISH, PORT ALLEN,

ABOUT 4.0 MILES SOUTH WEST OF BATON ROUGE AND 9.8 MILES NORTH NORTHEAST OF

PLAQUEMINES. TO REACH THE STATION FROM THE INSIDE OF THE PORT ALLEN LOCKS, GET KEY

FROM LOCK MASTER AND GO OUT TO HWY 1 AND CROSS OVER BRIDGE (HWY1) AND GO TO

SOUTH SIDE OF LOCKS AND GO TO GATE ON SOUTHSIDE OF LOCKS AND PROCEED TO TOP OF

LEVEE AND MARK ON TOP OF CENTERLINE OF LEVEE. THE STATION IS A 3.5" COE BRASS CAP SET

IN CONCRETE, 0.3' RECESSED BELOW GROUND SURFACE, 7' SOUTHWEST OF END OF CONCRETE

ABUTMENT ON TOP OF CENTERLINE OF LEVEE. NOTE--NOTIFY CORPS OF ENGINEERS AT ONE OF

THE FOLLOWING NUMBERS FOR ACCESS--(225)-343-3752 OR (225)-344-8272.

DESIGNATION: G 95

PID: BJ0710

STATE/COUNTY: LA/ST CHARLES

LAT/LON: N 30 00 02.35273 W 090 25 44.92641 NAD83 (2011)

NORTH/EAST: N 546,859.22 E 3,567,032.55 SPC LA S (US feet) ELEVATION: 27.13 feet NAVD88 (2004.65) ELEVATION: 27.10 feet NAVD88 (2006.81) ELEVATION: 27.23 feet NAVD88 (2009.55)

MARKER: BENCH MARK DISK

STAMPING: G 95 1938

DESCRIPTION: THE STATION IS LOCATED ABOUT 1.0 MILE WEST OF NORCO AT THE EAST END

OF THE BONNET CARRE SPILLWAY WEIR. OWNERSHIP--THE US ARMY CORPS OF ENGINEERS.

PHONE NUMBER IS (985) 264-7484. TO REACH THE STATION FROM THE INTERSECTION OF US

HIGHWAY 61 AND STATE HIGHWAY 48 IN NORCO GO SOUTH FOR 1.3 MI ON THE STATE HIGHWAY TO THE INTERSECTION OF PARISH HIGHWAY 12, TURN RIGHT AND GO WESTERLY ON THE PARISH

HIGHWAY FOR 1.0 MI TO THE BONNET CARRE SPILLWAY WEIR ON THE LEFT AND THE STATION

ON THE LEFT SET IN TOP OF AN NEAR THE CENTER OF THE EAST CONCRETE ABUTMENT OF THE WEIR. THE STATION IS LOCATED 32.6 M WEST OF THE CENTER OF THE HIGHWAY, 4.0 M NORTH

FROM THE SOUTH END OF THE ABUTMENT, 2.4 M SOUTHWEST OF A DEPARTMENT OF INTERIOR

HISTORICAL MARKER, 0.8 M SOUTH-SOUTHEAST OF THE CENTER ONE OF THREE GATE POSTS, 0.2

M EAST FROM A LARGE METAL GATE, AND 0.1 M BELOW THE LEVEL OF THE CONCRETE DRIVE

LEADING TO THE WEIR. NOTE--A KEY TO THE LARGE METAL GATE NEXT TO STATION CAN BE

AQUIRED FROM THE USCE OFFICE LOCATED ACROSS THE STREET FROM THE STATION, THE

GATE SHOULD BE COMPLETLY OPENED DURING DATA COLLECTION TO MINIMIZE GPS SIGNAL

MULTIPATH.

DESIGNATION: V 375

PID: AT0760

STATE/COUNTY: LA/ORLEANS

LAT/LON: N 29 55 01.55056 W 089 58 18.04217 NAD83 (2011)

NORTH/EAST: N 517,907.01 E 3,712,188.66 SPC LA S (US feet) ELEVATION: 2.33 feet NAVD88 (2004.65) ELEVATION: 2.23 feet NAVD88 (2006.81) ELEVATION: 2.23 feet NAVD88 (2009.55)

MARKER: FLANGE-ENCASED ROD

STAMPING: V 375 1985

DESCRIPTION: THE STATION IS LOCATED IN NEW ORLEANS, ON WEST BANK, 4.5 MILES

NORTH OF BELLE CHASE FERRY, 5.5 MILES SOUTHEAST OF GREATER NEW ORLEANS BRIDGE,

OVER MISSISSIPPI RIVER, 0.5 MILES SOUTH OF CHALMETTE FERRY. OWNERSHIP- CORPS OF

ENGINEERS. TO REACH THE STATION FROM THE INTERSECTION OF GENERAL DE GAULLE

AVENUE AND SULLEN ROAD, NEAR THE BRIDGE OVER INTERCOASTAL WATERWAY, GO NORTH

ON SULLEN ROAD TO PATTERSON DRIVE (LEVEE ROAD), TURN RIGHT ON PATTERSON DRIVE AND

PROCEED EAST ON PATTERSON FOR 0.9 MILES TO BLYTHE ROAD, TURN RIGHT ON BLYTHE AND

GO TO GATE ENTRANCE TO LOCKS, PASSING THROUGH GATE AND MARK ON LEFT NEAR GATE.

THE STATION IS 22.6 FEET EAST OF CENTERLINE OF ENTRANCE ROAD TO LOCKS, 18.3 FEET

SOUTHEAST OF THE EAST GATE POST FOR GATE, 107 FEET SOUTH OF A LIGHT POLE, 10 FEET SOUTH OF A WITNESS SIGN. STATION IS A STAINLESS ROD DRIVEN 25.6 METERS AND STAMPED V 375.

DESIGNATION: C 195

PID: AT0458

STATE/COUNTY: LA/PLAQUEMINES

LAT/LON: N 29 32 12.40316 W 089 45 47.15540 NAD83 (2011)

NORTH/EAST: N 380,461.97 E 3,780,155.38 SPC LA S (US feet) ELEVATION: 1.57 feet NAVD88 (2004.65) ELEVATION: 1.38 feet NAVD88 (2006.81) ELEVATION: 1.25 feet NAVD88 (2009.55)

MARKER: SURVEY DISK

STAMPING: C 195 1964

DESCRIPTION: MARK IS ABOUT 0.85 MILES SE OF ST JUDE CHURCH, SET IN TOP OF SE END OF

NW CONCRETE HEAD WALL OF AN 18 INCH PIPE CULVERT WITH WING WALLS UNDER A

DRIVEWAY TO VACANT LOT, 24.3 FT SW OF CENTER OF THE HIGHWAY, 68 FT NW OF A FIRE

HYDRANT, 44 FT SE OF CENTER OF A SMALL GATE, 9 FT NW OF CENTER OF A DRIVEWAY AND

ABOUT LEVEL WITH THE HIGHWAY, AND 1 FT NE OF A METAL WITNESS POST.

DESIGNATION: 876 0849 A TIDAL

PID: AT1390

STATE/COUNTY: LA/PLAQUEMINES

LAT/LON: N 29 16 00.52795 W 089 21 10.35484 NAD83 (2011)

NORTH/EAST: N 284,325.15 E 3,912,287.82 SPC LA S (US feet) ELEVATION: 2.82 feet NAVD88 (2004.65) ELEVATION: 2.60 feet NAVD88 (2006.81) ELEVATION: 1.53 feet NAVD88 (2009.55)

MARKER: BENCH MARK DISK

STAMPING: 0849 A 1985

DESCRIPTION: THE STATION IS LOCATED IN VENICE, 8 MILES SOUTH SOUTHEAST OF BURAS,

AT THE END OF HWY. 23 ON A GRAVEL ROAD LEADING TO NEW CONSTRUCTION AT THE TIME OF RECON AND A RED AND WHITE TOWER. (LOCATION OF NEW BUILDING WILL BE A WILDLIFE AND

FISHERIES HEADQUARTER). OWNERSHIP- PLAQUEMINES PARISH. TO REACH THE STATION FROM

THE INTERSECTION OF THE POST OFFICE AND HWY. 23 GO SOUTHEAST ON HWY. 23 FOR .9 MILES

TO A CURVE TO THE RIGHT, GO AROUND CURVE TO A CROSS ROAD ( JUMP BASIN RD.), TURN

LEFT FOR .05 MILES TO A SHELL ROAS TO RIGHT (OFFSHORE SHIPYARD RD.) TURN RIGHT AND GO

SOUTHEAST FOR .15 MILES TO A MARK ON THE LEFT ALONG A FENCE LINE JUST BEFORE

ENTERING INTO A GATE. 23.7 M NORTH FROM THE NORTH 1 OF 2 YELLOW KEYPAD SUPPORT

POSTS, 13.7 M EAST FROM A RED FIRE HYDRANT, 8.0 M NORTHEAST FROM THE CENTER OF A

GRAVEL ROAD, 1.0 M NORTHEAST FROM A METAL POST WITH WITNESS SIGN ATTACHED, 0.5 M

FROM A CARSONITE WITNESS POST, AND 0.3 M BELOW THE LEVEL OF THE GROUND.

DESIGNATION: TBM HEAD A

PID: BBCB54

STATE/COUNTY: LA/PLAQUEMINES

LAT/LON: N 29 08 01.11401 W 089 14 48.33284 NAD83 (2011)

NORTH/EAST: N 236,505.77 E 3,947,000.68 SPC LA S (US feet) ELEVATION: 3.83 feet NAVD88 (2004.65) ELEVATION: 2.53 feet NAVD88 (2009.55)

MARKER: SURVEY DISK

STAMPING: TBM HEAD A 10-043C

DESCRIPTION: TO REACH THE STATION FROM THE INT THE JUMP AT MISS RIVER IN VENICE,

LA, TRAVEL S ALONG MISS RIVER FOR 10.30 MILES TO THE HEAD OF PASSES INT AT MI 0 NEAR LIGHT 15, THEN TAKE SOUTH PASS FOR 1.0 MILE SE TO STATION ON THE RIGHT BANK NEAR GAGE SITE CODE 01545. THE MONUMENT IS A ALUMINUM CAP, SET IN A PVC PIPE AND CONCRETE 0.5 FT ABOVE GROUND AND STAMPED "TBM HEAD A 2010 10-043C". THE STATION IS 14 FEET W OF THE TOP BANK, 8 FEET S OF A 8 INCH TALLOW TREE AND 1 FOOT NE OF AN ORANGE WITNESS POST.

DESIGNATION: TBM JETTY

PID: BBCB62

STATE/COUNTY: LA/PLAQUEMINES

LAT/LON: N 28 55 55.11556 W 089 24 21.60758 NAD83 (2011)

NORTH/EAST: N 162,287.74 E 3,897,398.62 SPC LA S (US feet) ELEVATION: 3.81 feet NAVD88 (2004.65) ELEVATION: 2.17 feet NAVD88 (2009.55)

MARKER: SURVEY DISK

STAMPING: TBM JETTY 2010 10-043C

DESCRIPTION: TO REACH THE STATION FROM THE INTERSECTION OF THE JUMP AND THE

MISSISSIPPI RIVER IN VENICE, LA, PROCEED DOWNSTREAM FOR 10.3 MILES TO THE HEAD OF PASSES, THEN TAKE THE SOUTHWEST PASS FOR 17.6 MILES TO THE STATION ON THE LEFT BANK.

THE MONUMENT IS A COE ALUMINUM CAP, SET AT THE END OF A WOODEN WALKWAY LEADING

TO THE PILOT STATION HOUSE AND IS STAMPED "TBM JETTY 2010 10-043C". THE STATION IS 10

FEET EAST OF THE TOP OF ROCKS, 41 FEET NORTHEAST OF A WOODEN WALKWAY AND 2 FEET

EAST OF THE TOP OF BANK.

Use of the above benchmarks for all USACE MVN funded survey field work and in all plans and specifications shall be in accordance with: USACE MVN Engineering Division Datum Policy Memo #3, “Requirements for Use of Benchmarks for USACE Projects,” dated March 23, 2009;

the USACE New Orleans District Guide for Minimum Survey Standards for performing Topographic, Hydrographic, and Static GPS Control Surveys, Edition 2, dated September 2009 (ref: http://www.mvn.usace.army.mil/ed/edss/surveyingguidelines.asp); and a Survey Plan approved by the MVN District Datum Coordinator.

Section 4: Summary of Findings and Recommendations

This CEPD effort was performed in order to bring the “Mississippi River Ship Channel, Gulf to Baton Rouge” project into compliance with the requirements outlined in EM 1110-2-6065, Standards and Procedures for Referencing Project Elevation Grades to Nationwide Vertical Datums. This engineering manual requires that “coastal navigation project depths are defined relative to Mean Lower Low Water (MLLW) datum, and are being maintained to this datum and the latest tidal epoch as defined by the Department of Commerce.” The datum relationships defined in this report must be used to relate the currently maintained / reported Mean Low Gulf (MLG) depths to MLLW depths. This is only applicable south of river mile zero (Head of Passes), where the project is considered tidally influenced. The Low Water Reference Plane (LWRP 2007) shall be referenced above Head of Passes.

All project documents should be updated to show these datum relationships in order to relate MLG to MLLW, and measures should be taken in the future to start directly reporting with respect to MLLW. Providing this datum relationship will allow users to relate this data to the NOAA charts.

For the SW Pass portion of this project a MLLW-MLG calibration value has been defined as:

0.0’ MLLW = 3.5’ MLG

This calibration value will be considered absolute, and will not be redefined for SW Pass. Use of this relationship will be a no-impact change to dredging practices, as this has been determined using the current relationship to MLG. However, the relationship between MLLW and NAVD88 will need to be periodically updated to incorporate the future sea level rise and local subsidence, and the MLG gage correction values will be updated accordingly using this calibration value.

Dredging design templates and other associated project documents should be updated to include the datum relationships, and the MLLW depth can then be referenced on all future work.

Referring back to Figure 1 (page 7), if the project is currently maintained to a depth of 45’ MLG this would now be described as 48.5’ MLLW. Project documents that must be updated to reflect the MLLW values are:

Dredging templates Plans and specifications Operations and Maintenance manuals Channel Condition survey data posted on web page

The currently used MLG values can be referenced (as a legacy datum) during the period of transition, and can be phased out once the reported MLLW values are properly utilized.

The MLLW / NAVD88 datum relationships defined in this report are time dependant and will have to be regularly verified / updated. The CEPD Guidance indicates that the periodic reassessments of controlling elevations and datum relationships should be performed at least every five years. In order to accomplish this, the budgets for FY19 and FY20 must include funding for this effort. These reassessments will not change the MLLW / MLG calibration value, only the MLLW / NAVD88 relationships that will be used to define MLLW along Southwest Pass.

Any questions/comments relating to this material should be directed to Josh Hardy, MVN District Datum Coordinator (Joshua.T.Hardy@usace.army.mil, 504-862-1852).