SLIDES - Guajataca Presentation slides.pdf

AGENDA

GUAJATACA DAM DISCUSSION

DAY 1

TitleTime Registration, Reserve a One-on-One Contractor Teams session & Networking08:00 AM - 09:00 AM

Welcome & Opening Remarks09:00 AM - 09:15 AM

Presentation detailing upcoming Guajataca Dam Project09:15 AM - 10:15 AM

Small Business Program Discussion10:15 AM - 10:45 AM Break10:45 AM - 11:00 AM

One-Hour Open Forum (Q&A)11:00 AM - 12:00 PM Lunch Break12:00 PM - 01:00 PM

Continued, IF NEEDED One-Hour Open Forum (Q&A)01:00 PM - 02:00 PM

Closing Remarks02:00 PM - 02:15 PM Event Adjourns2:15 PM

INDUSTRY OUTREACH

EVENT DAY

PUERTO RICO

GUAJATACA DAM

PERMANENT REPAIR

PROJECT DISCUSSION

USACE - Latin America & Caribbean District 28 July 2026 0800 - 1430

AGENDA - GUAJATACA DAM PERMANENT

REPAIR

DAY 1

DescriptionTitleTime

Sign-in for attendees, coffee, and informal networking. Schedule 1-hour private virtual meetings between industry representatives and USACE technical/contracting personnel over the course of 4-7 Aug.

Registration, Reserve a One-on-One Contractor Teams session & Networking

08:00 AM - 09:00 AM

Project Manager, Chief of Contracting Office and Contracting Officer

Welcome & Opening Remarks09:00 AM - 09:15 AM

Presentation detailing upcoming Guajataca Dam Permanent Repair Project

PowerPoint Presentation: Guajataca Dam Project and Upcoming Opportunities

09:15 AM - 10:15 AM

SBA Introduction and Discussion Small Business Association (SBA) and Puerto Rico Economic Development Introduction

10:15 AM - 10:25 AM

Office of Small Business Programs - How to effectively do business with USACE Caribbean District.

PowerPoint Presentation: Small Business Program Discussion

10:25 AM - 10:55 AM

Transition and coffee break.Break10:55 AM - 11:15 AM

Panel discussion featuring USACE Leadership, Program Managers, and Small Business Professionals. Contractors can ask questions regarding the presentations, measures presented & acquisition strategies.

One-Hour Open Forum (Q&A)11:15 AM - 12:15 PM

Attendees are dismissed for lunch.Lunch Break12:15 PM - 01:15 PM Panel discussion featuring USACE Leadership, Program Managers, and Small Business Professionals. Contractors can ask questions regarding the presentations, measures presented & acquisition strategies.

Continued, IF NEEDED One-Hour Open Forum (Q&A)01:15 PM - 02:15 PM

Final words of appreciation and next steps for DAY 2 event. Closing Remarks02:15PM - 02:30 PM

Day 1 Outreach Event Day concludes.Event Adjourns2:30 PM

AGENDA - GUAJATACA DAM PERMANENT

REPAIR DISCUSSION

DAY 2

DescriptionTitleTime

Contractors and USACE personnel gather at the initial meeting point for attendance, logistics, and a mandatory site safety briefing.

Gather & Safety Briefing08:00 - 08:30

Two-Hour transit to the project site location.Inbound Travel08:30 - 10:30

Guided walkthrough of the project location, discussing site conditions, technical requirements, and environmental considerations.

Project Site Tour & Briefing10:30 - 12:30

Lunch on-site (brown bag - depending on logistics). Informal networking.

Working Lunch12:30 - 13:30

Two-Hour Return Transit back to the initial meeting point.

Outbound Travel13:30 - 15:30

Wrap-up questions, final administrative notes, and official conclusion of Outreach Event Day.

Final Debrief & Dismissal15:30 - 16:00

GROUND RULES AND PROCEDURES

1. Mute/silence phone

2. No technical discussion will be held in this forum

3. No recordings (no photographs, video or audio) allowed

4. Avoid sidebar discussion (If you need us to slow down or to repeat anything, please let us know)

DISCLAIMER

Information Provided During Outreach Event Day

Any information contained in the slides, or remarks or explanations made by USACE personnel during the presentations are for general information and will not change the terms and conditions of any resultant solicitation or subsequent contract.

HOW TO SUBMIT QUESTIONS

28 July 2026 0830 – 1100

• Notecards are available at the registration table

• Write down your questions on the notecards and place them in the basket on the registration table

• Questions that can be answered during this event will be addressed during the Q&A session

• All questions and answers will be provided on SAM.gov

PROJECT OVERVIEW

GUAJATACA DAM OVERVIEW

Project Purposes:

• Flood Risk Management

• Water Supply

• Recreation Hazard Potential Classification: High

Guajataca Dam, Quebradillas, Puerto Rico

GUAJATACA DAM PROJECT FEATURES

Owner: Puerto Rico Electric Power Authority (PREPA)

Hydraulic Fill Embankment Dam

Water Supply is primary purpose

• Built in 1920 for the Isabela Irrigation District

• Reservoir Capacity - 34,276 acre-ft

• Population of ~350,000 served

• Primary Source for 4 Water Plants

• Irrigation Canal for Agricultural Purposes

• Rio Guajataca

• Risk Level Similar to DSAC 2 for USACE-

Owned Dams

Project Benefits

• Flood Risk Management

• Water Supply & Irrigation (~250,000 families)

• Recreation

Repairs are a priority for PREPA because water supply is critical. The most important water reservoir for the northwest of the island.

HURRICANE MARIA IMPACT AND SPILLWAY

DAMAGES

Damages Caused to Reservoir Features

• Flooding of the Outlet Tunnel

• Outlet Structure Outfall Completely Clogged

• Spillway Breach due to head cutting

• Spilling event over bare ground were destabilizing some of the embankment.

• Pressurize Water Connection of the 54-inch

Diameter Pipe for the Canal was severed

• Intake Stem guides for gate c were destroyed

• Hydraulic lines inside outlet tunnel were ripped out

Repairs are a priority for PREPA because water supply is critical. The most important water reservoir for the northwest of the island

Dam, Quebradillas, Puerto Rico

EMERGENCY FLOOD FIGHTING ACTIONS

The strategies to prevent the Dam’s collapse were divided into three phases for Stage I :

o Phase I - Placing of 502 concrete barriers in the undercut area for stabilization purposes. This would also help the runoff energy dissipation reducing the surrounding slope erosion effects.

DVG placed the concrete barriers at the crest of the Dam, once in place US Army and Navy aerial support dropped them in the areas designated by USACE field personnel. Aerial support was a key factor due to limited access.

o Phase II - Construction of two stone abutments, along with the placement of 1,318 Super Sandbags filled with crushed stones (“mogolla”) for the creation of a power-dissipating pool. All bare soil ground areas were covered with blue stone 18 to 24 inches in size. The bags were filled in Mayagüez and were placed in the area with Army Cargo Helicopters, beginning 4 OCT 2017.

o Phase III - Installation of a dewatering system consisting of one 12 inch, one 8 inch and ten 18-inch pumps. This system will help reduce the water level in the dam and at the same time provide water for irrigation and human consumption.

EMERGENCY FLOOD FIGHTING ACTIONS

INTERIM RISK REDUCTION MEASURES

Stage II - Interim Risk Reduction Measures

Slab anchoring of remaining spillway structure using soil nailing

Fill under slab voids with high strength flowable fill, bulkhead construction at the end of breached slab

Concrete modules and coarse aggregate mooring by filling voids with high strength flowable fill

Restoring the connection between the reservoir and the Irrigation Canal by reconnection of the existing structure and continuing water pumping operation

Outlet Works stem gate, guides and operator replacements

Reducing slope of actual spillway

Construction of an energy dissipation pool at the end of existing spillway chute

Repair access roadway and slope repair (#476)

Grout, anchor, and seal cracks in the damaged spillway to prevent additional erosion

Install soil nails and shotcrete facing for the slopes of the eroded spillway channel slopes

Re-establish the 54-inch diameter water supply conduit to provide a more economical and reliable source of water for the water supply canal

Rehabilitate the high-pressure control gates of the intake tower

Stabilize the eroding slopes of the reservoir rim adjacent to the intake tower

Spillway and Channel Reinforcement: backfill eroded spillway channel and install new spillway channel lining to restore interim spillway capacity

UNDER SLAB VOID FILLING AND SOIL NAILING

54-INCH WATER CONNECTION REESTABLISHMENT

ARMOR STONE AND FLOWABLE FILL PLACING

INTERIM RISK REDUCTION FINAL

UP COMING STAGE III FOR THE PERMANENT REPAIR

PRELIMINARY ASSESSMENTS FOR PERMANENT REPAIRS

PRIMARY RISK DRIVERS

20CUI

Downstream

Landslide Movements Below/Within Dam & Spillway

Seismic Instability of Very Soft Puddle Core

Cracking/Erosion of Embankment

Seismic Intake Tower Collapse

Embankment Failure During Earthquake

Upstream

Spillway Chute Overtopping Leads to Embankment Sliding

During high discharge (35k cfs): Spillway flows overtop chute walls and scour dam toe, destabilizing embankment along landslide plane.

Left Abut. Void

Karst Voids in Abutments

N N

N PFMs E-10 & E-23

PFM E-3 & E-22

PFM O-3

PFMs S-2B & S-7

PFMs E-17 & E-22

Contributes to several PFMs

CUI 20

HYDROLOGIC LOADING CURVE/HAZARD CURVE

Spillway activates frequently (~1/3 chance in any given year)

EMBANKMENT – ORIGINAL CONSTRUCTION 1928

• Crest Elevation: 202.5 m;

• Hydraulically sluiced, very soft clay puddle core up to El. 194 m;

• Roller compacted core from El. 194 m to 202.5 m;

• Concrete key wall at foundation contact extending into bedrock

Small Slide (Feb 15, 1927)

Pre-Dam Topography

Embankment

Ground cracking and embankment deformations (1927)

Emergency stabilization berm and drain tunnel

March 1927

Enclosed depressions

Irregular and hummocky slope morphology on left bank slope (enclosed depressions, convex areas, arcuate slope-breaks, mid-slope benches, variable slopes, disorganized drainage patterns, View looking down spillway

HOWEVER: deformations were slowed but continued creep and distress was expressed in the embankment and spillway in the decades following construction

Steep, uniform right bank slope

MOVEMENTS DURING AND AFTER

CONSTRUCTION: 1927-1954

• Cracking and downstream movements occurred in Feb 1927 while dam construction was at 194 m and reservoir was at

182.5 m.

• Vertical displacement: Max movement at top of dam was about 1.4 m (4.6 ft) downward.

• Horizontal displacement: 1 m (3.3 ft) of movement in the downstream direction at toe of dam. 1.8 m (5.9 ft) further downstream of dam toe.

• Response:

• Reservoir was drained.

• Draining of core attempted through use of ditches and tunnels.

• Remaining core up to 202.5m was constructed with horse-drawn roller compacted dry fill.

• Additional material placed downstream of dam toe to the river channel.

• Movements again observed in May 1927, but this time on the upstream face. Measured to be 35 cm (1.1 ft) in upstream direction.

• Response was to add additional material to upstream toe.

• From 1927-1929: Creep rates measured 0.35m (1.1 ft) per year.

• “Slight” movements reported in the wet years of 1930-31.

• Response in 1935 was to place additional downstream fill.

• From 1942-1951: Creep rates measured 10 mm (0.4 inch) per year.

• Crest raised in 1954 (porous, low-density material)

USBR DAM SAFETY MODIFICATION: 1971 - 1984

• 1971: PRWRA was concerned with the dam and requested the USBR to perform evaluation.

• 1977: Both agencies agreed to modifications, including:

• Rebuilding upper 3 m of the crest.

• Constructing stability berm on downstream slope

• Replacing upper portion of damaged spillway

• Grouting and improving outlet works tunnel

• 1981: Construction contract awarded

• 1982: Excavation near river channel triggered dam movements.

• Investigations indicated “green clay” layer was likely responsible.

• Response was to construct a downstream toe buttress and cease placement of downstream stability/filter berm at El. 191 m

(instead of designed El. 195 m).

USBR Report Excerpt

USBR DAM SAFETY MODIFICATION: 1971 - 1984

• Spillway modifications

• Crest reconstruction

• Outlet works changes

USBR DAM SAFETY MODIFICATION: 1971 - 1984

Berm constructed to El.

191 (down from planned El. 195 m) due to embankment movement during construction.

USBR DAM SAFETY MODIFICATION: 1971 – 1984 (TUNNEL)

Intake Tower Gate C Gate A closed / silted in Gate B missing • Outlet controls at uptake shaft control building

• Concrete bulkhead and two high-pressure gates constructed in 1980s.

• Release capacity ~500cfs

USBR DAM SAFETY MODIFICATION: 1971 – 1984 (TUNNEL)

File Name

River Outlet

54-in Canal Outlet

Canal Outlet Gate River Outlet Gate

HP gates are 4’x4’ cast steel

• Additional toe buttress material added as a result of movement

• River Channel backfilled and replaced with 96” Dia Pipe

New Spillway Crest

LANDSLIDE MOVEMENTS (1982-1992)

I-14

NOTE: Dam foundation continues to creep at rate of about 25 mm (1 inch) per year along “green clay” sliding plane.

PROPOSED RISK REDUCTION MEASURES

POTENTIAL RISK REDUCTION MEASURES

Average Life Loss

A n nu al

P ro ba b ili ty o f

F a ilu re

1E-06

1E-05

1E-04

1E-03

1E-02

10 100 1,000

1E-01

1E-07

0.1 10,000

1E-00

E-E-

E-E-

Risk-Driving Potential Failure Modes

• E-23: Stoping into the right abutment

• E-10: Stoping into the left abutment

E-10

E-23

Abutment Cutoffs and Grouting

E-3

Average Life Loss

A nn ua l P ro ba bi lit y o f F ai lu re

1E-06

1E-05

1E-04

1E-03

1E-02

10 100 1,000

1E-01

1E-07

0.1 10,000

1E-00

E-17 & E-22

E-17 & E-22

Buttress

E-3E-3

Risk-Driving Potential Failure Modes

• E-22: Transverse cracking due to seismic loading

• E-17: Seismic deformation and cyclic softening of the puddle core leads to crest lowering and overtopping

• E-3: CLE along embankment transverse crack caused by landslide movement

E-3 & E-

E-3 & E-

Core Stabilization Wall

E-17

E-22

Risk-Driving Potential Failure Modes

• O-3: Seismic failure of the control tower

Average Life Loss

A nn ua l P ro ba bi lit y of

F ai lu re

1E-06

1E-05

1E-04

1E-03

1E-02

10 100 1,000

1E-01

1E-07

0.1 10,000

1E-00

O-3

Siphon or Pumped Backup Water Supply System

Canal Supply

River Supply

Average Life Loss A n nu al P ro ba b ili ty o f F a ilu re

1E-06

1E-05

1E-04

1E-03

1E-02

10 100 1,000

1E-01

1E-07

0.1 10,000

1E-00

Actionable only under As-Low-As-Reasonably- Practicable (ALARP) – (2)

• S-7: Scour of the grouted riprap chute

• S-2B: Overtopping of the right side of the spillway causing embankment scour and stability failure

Concrete Overlay

S-7S-7

S-2BS-2B

S-7

S-2B

Chute Raise

38CUI

CUI

GUAJATACA DAM PERMANENT REPAIR

CHALLENGES

Constructability (Means and Methods):

• Limited Space:

• Water Diversion and Care:

• Material Availability, Hauling and Management:

• Traffic Control:

• Long Lead Items:

OVERVIEW OF ACQUISITION APPROACHES

40CUI

USACE ACQUISITION STRATEGIES

SMALL BUSINESS PROGRAM

OFFICE OF SMALL

BUSINESS

PROGRAMS

Mariano Torres Feliciano Chief, Office of Small Business Programs USACE, Latin America & Caribbean District

Date: July 2026

Working Today to Build a Better Tomorrow

43CUI

OFFICE OF SMALL BUSINESS PROGRAMS

MISSION: USACE Office of Small Business leads the organization to fully utilize small businesses, to deliver the USACE mission.

VISION: Expand the USACE Office of Small Business and community, Commit to add value to all projects and communicate outcomes & Maximize innovation to lead the small business program into the future.

44SMALL BUSINESS’ ROLES DURING THE

CONTRACTING PROCESS

Pre-Solicitation: Attend planning meeting as the requirement is developed. Once the projects is clearly defined, assist in market research to identify potential work for small businesses. After market research is completed, assist in developing the acquisition strategy.

Solicitation-Award: Asist in the development of the solicitation and source selection plan (if required).

Ensure the solicitation contains proper small business clauses required by the regulations and policies. During award, assist in evaluating bids or proposals and subcontracting plans. Also, take lead to resolve protests concerning small business related issues.

Post Award: Monitor the performance of small business contractors and evaluate how well large businesses comply with subcontracting requirements.

45SMALL BUSINESS GOALS

FY26

FY26 GOALSSOCIO ECONOMIC CATEGORY

69.24%SMALL BUSINESS

12.40%SMALL DISADBANTAGED BUSINESS (SDB)

INCLUDING 8(a) SB DEVELOPMENT PROGRAM

1.00%SERVICE DISABLE VETERAN OWNED SB

(SDVOSB)

0.57%WOMEN OWNED SB (WOSB) &

ECONOMICALLY DISADVANTAGED WOSB

64.85%HUBZONE SMALL BUSINESSES

46SMALL BUSINESS PROPOSED

SUB-CONTRACTING PERCENTAGES

FY26 SOCIO ECONOMIC CATEGORY

13.00% - 31.00%SMALL BUSINESS

5.00% - 25.37%SMALL DISADBANTAGED BUSINESS (SDB)

INCLUDING 8(a) SB DEVELOPMENT PROGRAM

0.50% - 2.59%SERVICE DISABLE VETERAN OWNED SB

(SDVOSB)

2.30% - 3.61%WOMEN OWNED SB (WOSB) &

ECONOMICALLY DISADVANTAGED WOSB

1.00% - 5.00%HUBZONE SMALL BUSINESSES

PROCUREMENT ASSISTANCE

SBA Resources

• Business Opportunity Specialist

• Procurement Center Representative

Marketing Resources

• Contract Opportunities on SAM.gov

• Contract Data on SAM.gov

• System for Award Management

• Dynamic Small Business Search System

• Subcontracting Networking System

(SubNet)

Other Resources

• USASpending

• GSA Subcontracting Directory

• DoD Prime Contracting Directory

48CONTACT INFORMATION

Mariano Torres-Feliciano Chief Small Business Programs

USACE, Latin America & Caribbean District Fundación Angel Ramos, Annex Building

2nd Floor, Suite 202 383 Franklin D. Roosevelt Ave.

San Juan, PR 00918 Mobile: 787-220-0225

SB Email: saa-sb@usace.army.mil

SUBMIT QUESTIONS AND Q&A

SAM.GOV

• Please visit SAM.gov after Industry Day.

• All presentations, questions and answers, and the attendance sheet will be posted.

• Answers provided in this session are preliminary and the official answers will be posted with questions on SAM.

Notice ID: W51DQV-GUAJATACADAM