202008_MCD Virtual Industry Day Slides.pptx

Moose Creek Dam Safety Modification Chena river Lakes Flood Control project Alaska District - CEPOA

Virtual Industry Day

Alaska District 17 August 2020

“The views, opinions and findings contained in this report are those of the authors(s) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by other official documentation.”

Agenda

Contracting

Small Business

Project Overview (Project Manager/Lead Engineer)

Closing

Contracting Points of Contact Contract Specialists

Contracting Officer Theresa Afrank (Theresa.M.Afrank@usace.army.mil)

Mailing Address

DISCLAIMERS

Questions regarding the August 2020 industry day or any material presented shall be submitted through ProjNet (See next slide for instructions)

The information being presented today is draft/preliminary information for the Moose Creek Dam Safety Modification and is subject to change. No offers or proposals will be accepted at this time.

Once the formal solicitation is issued, the solicitation shall be reviewed in its entirety as changes may/will occur from the information presented today till the formal solicitation is released.

Any information presented today does not commit the Government to any particular Contracting means/methods as formal reviews and approvals will direct the acquisition.

Contracting

Instruction for contractor that already have an office and a vendor ID will go to:

https://www.projnet.org/projnet/binKornHome/index.cfm?StrKornCob=HomePagePublic Click register Fill out appropriate information (will need vendor ID which is obtainable from the ProjNet POC for that Contractor) Sign in Search for project: (name, P2 number, title) for this project it is Moose Creek Dam Modification (may have to click unpinned if nothing is showing up) Add project Click on project Click key access and enter: SSX5V3-3JIR8C From there a new menu will pop up and allow them to enter comments

If they do not have an office on ProjNet. Email Deandra.L.Wood@usace.army.mil with a good POC to get in touch with so USACE-POA can create a new office in ProjNet, which the users will then be able to register under and follow steps above.

PROJNET INSTRUCTIONS

Contracting All information regarding this acquisition will be posted to https://beta.sam.gov (formally known as www.fbo.gov) once it is available for release.

Solicitation Number is W911KB21R0001 – FAR Part 15 Contracting by Negotiation

- Anticipating Best Value Tradeoff Source Selection

NAICS is 237990 Other Heavy and Civil Engineering Construction

- Small Business Size Standard $39.5 Million

Anticipated contract is FFP

Project Magnitude is between $100,000,000 and $250,000,000

Approved by SBA as Unrestricted Acquisition

Schedule Physical site visit is schedule for 20 August 2020 as stated in beta.sam.gov posting.

One-on-One briefing schedule is in works, once finished, WebEx notices will be sent out.

Tentative Schedule (Calendar Year)

No further industry day’s are scheduled. If a site visit is held as part of the solicitation, the details for that site visit will be published in the solicitation.

Solicitation and all amendments must be signed/acknowledged Contractors must have an active registration in https://beta.sam.gov and must not be debarred and/or suspended to be considered for award.

Site Visit 20 August 2020 Meeting Point has moved from Project Office parking lot to location identified below.

Hard Hat, Steel Toe Boots/Shoes, Reflective Vest, Hearing Protection, Safety Glasses are required. Active construction is going on near dam control works.

USACE-CEPOA Small Business Professional

Alaska Procurement Technical Assistance Center https://ptacalaska.org/

Small Business Contacts/Helpful links Procurement Center Representative (Alaska)

System for Award Management https://beta.sam.gov/

Small Business Administration www.sba.gov

Moose Creek Dam Safety Modification Chena river Lakes Flood Control project Steve Howard Project Manager

Coleman Chalup P.E.

Lead Engineer Dam Safety Program Manager

Robert Tedrick P.E.

Design Manager

Alaska District 17 August 2020

“The views, opinions and findings contained in this report are those of the authors(s) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by other official documentation.”

All information is subject to change once the project is out for bid.

This information represents a 65% design

Project Location

OPERATIONAL SCHEMATIC

Population at risk Operational schematic

Reaches

Project Office Reach 1 Reach 2 Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 Reach 9 Control Works/Chena River

FLOODWAY AND DAM

Control Works (1992 Pool of Record)

NEED TO UPDATE

Geology

Foundation is gravelly sand/sandy gravel that likely exceeds 1000 ft in thickness with a surficial blanket of silt.

The transition from sand and gravel to silt includes layers of sand and silty sand, including fine sand with Cu<3.

The sand and gravel includes gap graded and open work gravel lenses.

Sloughs from meanders and braids, as well as permafrost, complicate the near surface geology.

Chena River Tanana River

600 ft

MCD

SLOUGHS AND PERMAFROST LOCATIONS

Mapped Sloughs Mapped Permafrost

Capacitive-Coupled Resistivity (CCR) - 50 foot depth

Electrical Resistivity Tomography (ERT) - 300 foot depth

Ground Penetrating Radar (GPR) - 50 foot depth

Embankment Design

Rock Fill

Geotechnical Investigation – USACE-CEPOA Centerline Boreholes

R3 R4 R5 R7 R6 R8 R9

89 borings for embankment and potential borrow sources 6,140 feet drilled Borings ranging from 15 to 130 feet deep Results Encountered permafrost Mix Design samples Better understanding of foundation conditions Encountered zones with cobbles Identified soil in potential borrow sources

Potential Failure modes

24 ft 40 to 80 ft

Silt Layer Coarse Sand and Gravel Layer

Pooling and Floodway from Chena River Stability Berm Upstream Water Stage <= 525 feet NAVD 88 Continuous Silty sand/fine sand Layer

Boils Boils Downstream – City of North Pole

Impervious silt blanket Moose Creek Dam During periods of high water stages in the Chena River, due to the silty sand and fine sand layer under the silt layer, three modes of failure can occur under the Moose Creek Dam: 1. backwards erosion and piping (horizontal exits), 2. backwards erosion and piping (vertical exits) and 3. contact erosion. These three modes of failure could act independently or together, eventually causing a failure in the dam, leading to flooding and potential risk of loss of life and damage to the cities of North Pole and Fairbanks, and other adjacent communities.

Horizontal Exit Vertical Exit Allowable Seepage Backwards erosion Potential Failure point Contact Erosion Piping

LEGEND

Potential Failure in Dam Fairbanks City of North Pole Backward Erosion and Piping with Vertical Exit Backward Erosion and Piping with Horizontal Exit Contract Erosion

PLAN (BARRIER WALL)

Geotechnical Investigation – USACE-CEPOA Centerline Boreholes with Barrier Wall Extents

R3 R4 R5 R7 R6 R8 R9

Existing Crest

ALLOWABLE CREST HEIGHT REDUCTION

No side casting of material to the upstream or downstream

North Abutment

Station 457+00 to 479+70

Looking South Looking North

Station 434+29 to 457+00

Station 411+59 to 434+29 control works tie-in

Barrier Wall (Control Works tie-in)

Barrier wall tied into sloped concrete wall Sheet pile Jet Grouting Mix-in-Place

Station 388+90 to 411+59

Station 366+19 to 388+90

Station 343+49 to 366+19

Low Point Drain

Station 320+79 to 343+49

Station 298+09 to 320+79

Station 252+70 to 275+39

Station 230+00 to 252+70

Powerline decommission

Looking West Looking East

Mix-in-place waste material placement

Improve East Cutoff Dike Access Road Improve Tree Laydown Area Surface

Proposed North Borrow Source

Proposed Peninsula Borrow Source & staging/laydown area

Proposed South Borrow Source

Haul Roads

Mix Design Findings To Date Bureau of Reclamation Design Standards No. 13: Embankment Design (Table 16.7.11-1)

FHWA Design Manual: Deep Mixing For Embankment and Foundation Support (Bench Scale Testing)

Bureau of Reclamation Used for comparison of Mix Design

FHWA

Used Bench Scale Testing to conduct Mix Design

Contractor will be required to perform their own Mix Designs after award of the contract.

Allowable Technology for Barrier Wall construction at moose creek dam Mix in place methods shall be utilized to mix the embankment and foundation materials with Bentonite and Portland Cement in order to construct a Barrier Wall through Moose Creek Dam.

Any methods that utilize a bentonite slurry trench to support the embankment while excavation of the barrier wall takes place will NOT be utilized at Moose Creek Dam. The potential loss of slurry could result in failure of the embankment into the excavation during construction due to highly pervious foundation materials.

8/14/2020

Proposed Construction Criteria/Constraints

Closing Comments Questions should be submitted via ProjNet

These slides are posted to the industry day notification.

Questions/answers will be posted once all answers are consolidated.

Reminder: The Government reserves the right to not answer questions should they chose to do so.

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