W9127824B0001 Pre-Bid Meeting MFR 2024.02.29.pdf

CESAM-PM-CM 28 Feb 2024

MEMORANDUM FOR RECORD

SUBJECT: Notes of the Mobile Harbor Phase 6 Pre-Bid Meeting held 27 Feb 2024 (SOLICITATION NO:

W9127824B0001)

Participants: See sign-in sheet (attached)

1. Presented slides to the participants are attached and were provided on CT along with this MFR.

2. Summary of General Discussions.

• Participants were reminded all discussion is considered for informational purposes. Official communication shall follow the RFI process per the solicitation documents.

• Engineering clarified the volumes for cut layers assumed vertical side slopes.

• The remaining phases for Mobile Harbor Deepening and Widening are scheduled for completion March 2025.

• The sand layers can be placed in the Deer River and/or the Dauphin Island Causeway sand berm.

• The order of work provided in the specifications is for basis of bid. Specifications allow the contractor to develop an alternate plan for approval.

• The USACE team places significance on the Deposition Plan for coordination with the contractor.

• The Government will complete surveys within the channels. The contractor will complete surveys at the placement sites.

• The Contractor is responsible for developing an Acceptance Plan for the placement sites.

• Contractors are to be aware the Phase 5 construction is ongoing. Weeks Marine is the contractor. Phase 5 has adjacent dredging in the channel to Phase 6 and also uses the Relic Shell. Coordination with the Phase 5 contractor for dredging and pipeline corridors should be anticipated.

• A stockpile can be used at Deer River and Dauphin Island Causeway upon approval by the COR as needed.

• Stockpile volumes should not affect the construction of the other site.

3. An optional site visits to the Deer River Beneficial Use Site was conducted at 1300 CST via a USACE vessel.

4. An optional site visits to the Dauphin Island Causeway Beneficial Use Site was conducted at 1500 CST. The site was viewed from land.

/s/ Mary E. Sullivan Project Manager Programs and Project Management Division

2/27/2024

Mobile Harbor Phase 6 Prebid Meeting

27 FEBRUARY 2024

PREBID MEETING GUIDELINES

• Information shared herein is considered informal and does not supercede the plans and specifications.

• Discussion is encouraged but all formal questions must be submitted through the RFI process.

Channel Deepening: 50 feet Bay/ 52 feet Bar Channel Widening: 3 mi. long, 100 ft wide*

Turning Basin Modification Bar Channel Bend Easing

A

B

C

B

CONSTRUCTION PHASING

Hopper/ Pipeline

1.6MCY

Phase 1: Bar Channel Deepening (Complete)

Hopper 7.1MCY Phase 2a and 2b: Bar Channel & Bend Easings to 52' plus Widener

Hopper 6.1MCY Phase 3: Deepening Lower Bay Channel (Complete)

Hopper 6.1MCY

Phase 4: Deepening remainder of Lower Bay Channel and portion of Upper Bay Channel (Complete)

Pipeline 4.6MCY Phase 5: Deepen Upper Bay Channel (Relic Shell) (Ongoing)

Bucket and Scow

2.1MCY Phase 6: Turning Basin

TARGET CONSTRUCTION SCHEDULE

6‐9 month effort FY20 (Sep 2020) Phase 1

8‐9 month effort FY24 (2nd quarter)Phase 2a

8‐9 month effort FY24 (2nd quarter)Phase 2b

12‐18 month effort FY21 (Apr 2021) Phase 3

15 month effortFY22 (July 2022) Phase 4

10‐12 month effort FY24 (1st quarter)Phase 5

8‐10 month effort FY24 (2nd quarter)Phase 6

CONSTRUCTION STATUS

•Project Partnership Agreement (PPA): 17 Jun 2020 •First Contract (Phase 1) Awarded: 28 Sep 2020 ‐ Complete •Second Contract (Phase 3) Awarded: 21 Apr 2021‐ Complete •Third Contract (Phase 4) Awarded: 11 July 2022 ‐ Complete •Fourth Contract (Phase 5) Awarded: 31 Jan 2024

B

A

C

Phase 1

Phase 2

Phase 3

Phase 5 Phase 6

Phase 4

Mobile Harbor Project Plan

Mobile Harbor Phase 6 Construction Proposal Schedule

Advertisement: 16 Feb 2024 Pre-bid Meeting: 27 Feb 2024 (alt weather date of 05 Mar) RFI Period Closes: 04 Mar 2024 Bid Opening: 19 Mar 2024

Pipeline Dredge

Bucket and Scow

Hopper

D e c

M a r

Ju n

S e p

D e c

M a r

Ju n

S e p

D e c

M a r

Ju n

S e p

Phase 1

DURATION

P H

A S

E

Phase 3

Phase 5

Phase 6

Hopper/Pipeline

Hopper

Hopper

D e c

M a r

Ju n

Phase 4

S e p

D e c

Phase 2a

M a r

Complete

Complete

Complete

Phase 2b

Pipeline Dredge

Mobile Harbor Target Construction Schedule

Ongoing

ORDER OF WORK

3.2 DREDGING

3.2.1 Order of Work

• The Contractor shall submit a Order of Work Plan describing all methods, materials, equipment, and personnel to be utilized during dredge and placement operations including submerged pipelines and pipeline routes and staging and access areas. The order of dredging will be dependent on the placement features to be created with the dredge material.

• Dredging of the Mobile Harbor Federal Navigation Channel Improvements for this contract has generally been divided into 7 separate horizontal (A-G) and 13 vertical cuts based on material types for best matching with the placement. The associated placement location of each cut is provided in table 1. The contractor shall make their own determination of the existing conditions and propose the dredge cuts and placement feature order of construction within the work plan to be approved by the Contract Officer. The Government reserves the right to change the order of work at any time.

• The preferred dredged material placement order of work is to fill the Deer River and Dauphin Island Causeway North dredge material placement sites to the specified lines, grades and elevations prior to placement in Dauphin Island Causeway South dredge material placement site.

• Dredged material placement in the Dauphin Island Causeway North and South dredge material placement sites shall be performed in a continuous and consecutive manner. Placement of material will generally proceed where the coarser sandier material is used to construct sand berm features first to help contain the finer silts and clay material placed behind in the marsh creation areas.

• For the Dauphin Island Causeway North and South Sand Berm the preferred placement is from south to north. The Contractor may elect to construct the sand berms beginning at the approach channels/pipeline corridor landing areas and advancing towards the south and north;however, the portion from the landing area to the southern end must be completed before advancing northward from the landing area. If the Contractor elects to begin material placement at the landing area proceeding southward at the Dauphin Island Causeway South Sand Berm, then the sand berm must tie-in to the existing shoreline with an internal containment berm between station 64+00 and 74+00 to create a partially filled area behind the completed berm sections to receive fill for the marsh creation.

ORDER OF WORK

DEPOSITION PLAN

3.2.1.1 Work Plan

A Work Plan is to be submitted by the Contractor for review and approval by the Contracting Officer. The work plan is to cover all aspects of dredging, transport, and placement operations and shall include, but not be limited to, the following:

a. Deposition Plan: A Deposition Plan is to be submitted by the Contractor to the Contracting Officer for approval prior to placement of any dredged material under this contract. The Contractor's Deposition Plan is to be completely explanatory and include all assumptions, statements of fact, computations and a narrative to fully explain the procedures that the Contractor will follow during the contract. The Contractor's Deposition Plan will address each different placement situation, including but not limited to:

• contingencies to correct any excess displacement of in-situ water bottoms,

• non-compliant turbidity

• placement of varying material types, and/or slope failures that may occur during placement of material.

• weir structures (if needed)

• the means and methods for surveying and monitoring the placement of fill to meet required slopes and grades, i.e.

grade stakes, settlement plates, topographic surveys, etc.

SURVEYS

• Channel BD and AD surveys will be performed by the Government

• All BD and AD disposal site surveys will be performed by the contractor.

• Marsh creation sites shall be surveyed using RTK. Lidar is recommended but not required.

• The use of drones and lidar have specific permits and requirements that must be followed.

BID SCHEDULE

SPECIAL NOTES:

• The contractor shall submit their own dredge cuts in the workplan, similar to Table 1 in section 35 20 23, which may be used for acceptance purposes in lieu of acceptance sections by channel stationing,

• Bid Item No. 2: Payment will be based on the volume of material dredged within the limits shown in the contract drawings and the transportation of the dredged material to the Deer River and Dauphin Island Causeway Beneficial Use sites.

• As the contractor progresses, after-dredge surveys used to calculate partial payments will also serve as the before-dredge surveys for subsequent partial payments.

• Bid Items 3, 4 and 5: The government reserves the right to accept a template below the tolerances shown in the drawings if the contractor encounters in-situ water bottoms in the placement site that are unsuitable for efficient fill operations.

Mobile Harbor Phase 6 Beneficial Use: Relic Shell Mined Areas

Placement Areas

Relic Shell Placement:

5 placement areas (used for Phase 5 and Phase 6) Water depths shallow ( ~ 9 to 14 ft deep) Target lift thickness 1.5ft (not to exceed 3ft) Material from Upper Bay Channel:

Primarily poorly graded fine to coarse sands with varying amounts of silt, clay, and gravel (SP, SW, SM, SC) with occasional clay lenses

Area (acres) Estimated

Site Placement Capacity (CY)

Estimated New Work Dredged

Volume (CY)

Approximate Distance (ft)

From Channel

Mobile Harbor Phase 6 Beneficial Use: Deer River Project

Mobile Harbor Phase 6 Beneficial Use: Deer River Project

Deer River (Phase 6):

1 placement site approximate 20 acres Submerged Aquatic Vegetation (SAV) nearby Water depths shallow ( ~ 2 to 10 ft deep) Distance from turning basin down the channel ~ 15 miles Theodore Ship Channel ~5 miles

Material from Turning Basin:

Historical predominantly sandy/coarse grained materials (SP, SW, SP-SM, SM)

Environmental:

Pre/Post Surveys Turbidity Monitoring

Project Proponent:

Mobile Bay National Estuary Program

Designer: Thompson

Mobile Harbor Phase 6 Beneficial Use: Deer River Project

Project Proponent:

Mobile Bay National Estuary Program

Designer: Thompson

Deer River (Phase 6):

Containment berm constructed by others Approximately 210,000 yd3 from turning basin Material above approximately -30 feet in the turning basin expansion +/- 1.5 foot tolerance

DEER RIVER MARSH CREATION AREA

3.3.6.1 Deer River Marsh Creation Area

• An estimated 165,000 cubic yards of inplaced predominately sandy material, dredged from the COR approved dredge cuts, shall be used to fill the Deer River Marsh Creation site to the lines, grades and elevations shown on the Contract drawings.

• Approximately 82,360 square yards of material shall be placed within this placement site. Discharge of dredge material slurry will only be allowed within the existing containment berm shown on the contract drawings.

• The target fill elevation range is +2.5’ to +3.5’ NAVD 88.

• Should the estimated 165,000 cubic yards of inplaced dredge material exceed the site capacity as determined by the maximum target fill elevation, Contractor may delinate a stockpile area furtherest from the weir locations for COR approval.

Mobile Harbor Phase 6 Beneficial Use: Deer River Project

Optional Site Visit Today:

13:00 CST

Meet at 7560 Deer River Road, Theodore, Alabama 36582 View site via vessel

Mobile Harbor Phase 6 Beneficial Use: Dauphin Island Causeway Project

Mobile Harbor Phase 6 Beneficial Use: Dauphin Island Causeway Project

Dauphin Island Causeway (Phase 6):

Material from Turning Basin:

Historical predominantly sandy/coarse grained materials (SP, SW, SP-SM, SM)

2 placement areas Oyster Habitat nearby Water depths shallow ( ~ 2 to 10 ft deep)

Pump out area -10 to -12 ft elevation Distance from turning basin down the channel ~ 25 miles Channel to the placement areas ~6 miles

Environmental:

Pre/Post Surveys Turbidity Monitoring

Project Proponent:

Mobile County

Designer:

Moffatt & Nichol

South

North

DAUPHIN ISLAND CAUSEWAY NORTH

DAUPHIN ISLAND CAUSEWAY NORTH SAND BERM

3.3.6.2 Dauphin Island Causeway North Sand Berm

• An estimated 109,000 cy of inplaced predominately sandy coarser material from the COR approved dredge cuts shall be used to fill the sand berm fill to the lines, grades, and elevations indicated in the Contract documents. Approximately 5,947 linear feet of sand berm shall be placed within this placement site. Discharge of dredge material slurry will only be allowed within sand berm fill area shown on the contract drawings.

• Additonally the dredge discharge must always be located at least 25 feet away from the existing shoreline. To the extent practical, the fill placement must be uniform with minimal ridges, humps and depressions. The Contractor may construct interal training dikes, at their own discretion, at locations within the sand berm fill area. Spreader and pocket pipe or other measures may be used as necesssary to prevent gullying and erosion.

• The target constructed sand berm elevation is +3.5’ NAVD 88. The vertical fill tolerance is ±0.5’. The sand berm target fill elevation range is therefore +3.0’ to +4.0’ NAVD 88. The sand berm crest shall have a maximum width of 15' and a minimum width of 5'. The sand berm landward slope shall have a grade no shallower than 30:1 (H:V) with no limits on the maximum grade (i.e. maximum steepness) of the slope. The Contractor is encouraged to minimize the volume of sand material placed in the sand berm section within the defined template to maximize the length of sand berm that can be constructed with available sandy fill material and to ensure that sufficient length of sand berm is constructed prior to the placement of the marsh creation fill areas. On portions of the sand berm landward slope below Mean Low Water (MLW), the Contractor may place material to the natural angle of repose if different from the design slope of the placement section.

• The Contractor shall ensure that there are no undrained areas or abrupt mounds within the completed segments. The Contractor is not required to perform grading on portions of the sand berm landward slope below MLW. Should the estimated 109,000 cys of inplaced dredge material exceed the sand berm capacity as determined by the target fill crest width and elevation the Contractor with COR approval may place excess material within the north marsh creation fill area.

DAUPHIN ISLAND CAUSEWAY NORTH MARSH

CREATION FILL

3.3.6.3 Dauphin Island Causeway North Marsh Creation Fill

• An estimated 167,000 cy of inplaced predominately finer sands, silts and clay materials from the COR approved dredge cuts shall be used to fill the marsh creation fill to the lines, grades, and elevations indicated in the Contract documents. Approximately 288,282 square yards of marsh area shall be placed within this placement site. Discharge of dredge material slurry will only be allowed within marsh creation fill area shown on the contract drawings.

• Additonally the dredge discharge must always be located at least 25 feet away from the existing shoreline. To the extent practical, the fill placement must be uniform with minimal ridges, humbs and depressions. The Contractor may construct interal training dikes, at their own discretion, at locations within the sand berm fill area.

• Spreader and pocket pipe or other measures may be used as necesssary to prevent gullying and erosion. At no point shall fill be placed on the existing wetlands or within the Dauphin Island Parkway Right of Way. Fill shall be placed in such a way so as to not erode or damage the existing shoreline including any natural or armored shorelines.

• The target constructed Dauphin Island Causeway marsh creation elevation is +2' NAVD88. The vertical fill tolerance is +/- 0.5'. The marsh creation fill elevation range is therefore +1.5' to +2.5' NAVD88.

• Should the estimated 167,000???? cys of inplaced dredge material exceed the marsh fill capacity as determined by the maximum fill tolerance elevation the COR may make adjustments to the marsh creation fill elevation or direct the contractor to place excess within the Dauphin Island Causeway South Marsh.

DAUPHIN ISLAND CAUSEWAY SOUTH

DAUPHIN ISLAND CAUSEWAY SOUTH SAND BERM

3.3.6.4 Dauphin Island Causeway South Sand Berm

• An estimated 77,569 cy of inplaced predominately sandy coarser material from the COR approved dredge cuts shall be used to fill the sand berm fill to the lines, grades, and elevations indicated in the Contract documents. Approximately 3,363 linear feet of sand berm shall be placed within this placement site. Discharge of dredge material slurry will only be allowed within sand berm fill area shown on the contract drawings.

• Additonally the dredge discharge must always be located at least 25 feet away from the existing shoreline. To the extent practical, the fill placement must be uniform with minimal ridges, humbs and depressions. The Contractor may construct interal training dikes, at their own discretion, at locations within the sand berm fill area. Spreader and pocket pipe or other measures may be used as necesssary to prevent gullying and erosion.

• The target constructed sand berm elevation is +3.5’ NAVD 88. The vertical fill tolerance is ±0.5’. The sand berm target fill elevation range is therefore +3.0’ to +4.0’ NAVD 88. The sand berm crest shall have a maximum width of 15' and a minimum width of 5'. The sand berm landward slope shall have a grade no shallower than 30:1 (H:V) with no limits on the maximum grade (i.e. maximum steepness) of the slope.

• The Contractor is encouraged to minimize the volume of sand material placed in the sand berm section within the defined template to maximize the length of sand berm that can be constructed with available sandy fill material and to ensure that sufficient length of sand berm is constructed prior to the placement of the marsh creation fill areas.

• On portions of the sand berm landward slope below Mean Low Water (MLW), the Contractor may place material to the natural angle of repose if different from the design slope of the placement section. The Contractor shall ensure that there are no undrained areas or abrupt mounds within the completed segments. The Contractor is not required to perform grading on portions of the sand berm landward slope below MLW.

• Should the estimated 77,569 cy of dredge material exceed the sand berm capacity as determined by the target fill crest width and elevation between station 64+00 and 97+62.82 the Contractor may elect with COR approval to place excess material within the South marsh creation fill area and/or within additional South Sand berm to the north of station 64+00.

DAUPHIN ISLAND CAUSEWAY SOUTH MARSH

CREATION FILL

3.3.6.5 Dauphin Island Causeway South Marsh Creation Fill

• An estimated 43,000 cy of inplaced predominately finer sands, silts and clay materials from the COR approved dredge cuts shall be used to fill the marsh creation fill to the lines, grades, and elevations indicated in the Contract documents.

• Approximately 57,588 square yards of marsh area shall be placed within this placement site. Discharge of dredge material slurry will only be allowed within marsh creation fill area shown on the contract drawings.

• Additionally the dredge discharge must always be located at least 25 feet away from the existing shoreline.

• To the extent practical, the fill placement must be uniform with minimal ridges, humbs and depressions. The Contractor may construct interal training dikes, at their own discretion, at locations within the sand berm fill area. Spreader and pocket pipe or other measures may be used as necesssary to prevent gullying and erosion.

• The target constructed Dauphin Island Causeway marsh creation elevation is +2.5' NAVD88. The vertical fill tolerance is +/- 0.5'.

The marsh creation fill elevation range is therefore +2' to +3' NAVD88.

• Should the estimated 43,000 cys of inplaced dredge material exceed the marsh fill capacity as determined by the maximum fill tolerance elevation the COR may make adjustments to the marsh creation fill elevation or direct the contractor to place excess within additional South Sand berm to the north.

Mobile Harbor Phase 6 Beneficial Use: Dauphin Island Causeway Project

Optional Site Visit Today:

15:00 CST

Meet at 16871 Dauphin Island

Parkway, Coden, Alabama 36523 (Jemison’s Bait & Tackle)

View the site from land.