Site Visit Presentation.pdf
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- Solicitation number
- W912PM26RA04
About this file
This is a site visit presentation document for the Philpott Dam Anchors & Stability Project scheduled for May 5, 2026, in the Wilmington District of the U.S. Army Corps of Engineers.
The project addresses alkali-silica reaction (ASR) damage to the concrete dam constructed in 1952 using aggregate susceptible to ASR. The dam, located on the Smith River, is 892 feet long with a 220-foot maximum height and a 120-foot spillway crest. Historical analysis reveals that 1969 spillway anchors are stressed at approximately 92 percent of gross ultimate tensile strength due to ASR on unbonded lift joints, with potential for eventual rupture. The upper portions of Monoliths 9 and 13 are expanding toward the spillway. The FY26 construction scope includes installing 12 new re-stressable spillway anchors with load sensors, installing inclinometers in Monoliths 9 and 13, and automating crack gauge and piezometer monitoring. The Government will execute this acquisition through a negotiated FAR Part 15 procurement using Request for Proposals (RFPs), awarding a firm-fixed-price contract to the responsible offeror whose proposal provides the best overall value. Evaluation criteria include Technical Approach, Key Personnel, Past Performance, and Small Business Participation Plan. Bidders must submit questions via ProjNet before close of business May 29, 2026, using Bidder Inquiry key 3359F6-8VVZJS. Primary points of contact include James Duke (Project Manager), Troy D. Small (Contracting Officer), and Jenifer Garland (Contract Specialist).
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Philpott Dam: Anchors & Stability Project Site Visit
05 MAY 2026
Discussion Agenda
• Presentation – 0800-0915
• Project Orientation & History
• Proposed Project Overview
• Spillway Anchoring
• Instrumentation
• Post Presentation Tour – 0930-1200
• Safety Review
• Piezometers @ Powerhouse
• Anchors @ Top of the Dam
* Times are approximate, and may shorten or events occur earlier depending on progress
Wilmington District POCs
• James Duke, Project Manager
• James.H.Duke@usace.army.mil.
• Walt Haven, ETL
• Walter.T.Haven@usace.army.mil.
• Richard Beckwith, ProjNet Manager
• Richard.E.Beckwith@usace.army.mil.
• Scott Surratt, ProjNet Manager
• Scott.Surratt@usace.army.mil
• George Clark, AE Contract Management
• George.E.Clark@usace.army.mil.
• Troy D. Small, Contracting Officer
• Troy.D.Small@usace.army.mil.
• Jenifer Garland, Contract Specialist
• Jenifer.M.Garland@usace.army.mil.
Bidder Inquiry Process
• Submit questions via ProjNet before COB 29 MAY 2026.
• ProjNet website: https://www.projnet.org.
• Use the Bidder Inquiry key 3359F6-8VVZJS.
Project Location
District Boundary
Philpott Dam
SAW Office
Dam Characteristics
1015.33 Ō, NAVD88 Top of Dam EL.
892 Ō. Length of Dam
984.33 ft., NAVD88 Spillway Crest EL.
120 Ō. Spillway Crest Length
31 Ō Spillway Crest Width
220 ft. Maximum Height
Spillway
Tailrace Stilling Basin
Powerhouse
CUI
Spillway Cross-Section:
Sluice to Stilling Basin
Cross-Section:
Penstock to Powerhouse
Head Gate Bay
Gate & Penstock Flow to Turbine
Philpott Dam: Upstream, Right Side
Spillway Headgate Bay Area
Monolith 9 Monolith 8
Spillway
Monolith 13
Philpott Dam: Upstream, Left Side
General Historical Timeline
Construction Completed
Aggregate and concrete mixtures used with ASR susceptibility.
Crack observations and measurements begin
Spillway Anchor Installations
1980s 1993
Subsequent Crack Mapping
Efforts
PI No.2
Recommendation:
Spillway Remediation (Anchors)
Alkali-Aggregate Reaction (AAR)
• Alkali-Silica Reaction (ASR) Amorphous or microcrystalline silica aggregate (common in stream beds) Strained quartz-bearing aggregate Amphibolite aggregate
• Philpott Dam aggregate: locally sourced braided stream bars
Philpott Spillway Tendon Installation in 1969.
BUILDING STRONG®
1969 Spillway Repair
(IAW PI #2 (OCT 1968))
Philpott Spillway Tendon Installation in 1969.
BUILDING STRONG®
Philpott Dam – 1969 Spillway Repair
Spillway Anchors (1969)
General Historical Timeline (continued)
20092004 2010
ERDC (USACE)
Crack mapping completed for:
-Interior and DS face of the dam
-Headgate bay area
Other Specifics:
-Six cores drilled
-Pulse velocity testing
-Compressive strength
-Petrographic exam
Robin Charlwood, Ph.D.
Completed an independent technical review of concrete cracking at the dam.
Findings:
− ASR Cracking
− Potential anchor failure & spillway crest separation
− Headgate Bay cracking
Recommendations:
− Headgate Bay Structural Analysis
− Finite Element Analysis of Spillway
HDR
Crack mapping completed:
- Interior of the dam
- Headgate bay area
Also completed:
3D Finite ElementAnalysis of Spillway Monoliths
Structural Analysis of headgate bay area
Proposals/Cost estimates for recommended repairs
Recommended more thorough 3D Finite Element Analysis and bonding of lifts
SEAMAR
Crack mapping of US and DS faces of the dam, below the waterline to EL 835-ft NGVD29.
Army Dive Team Crack mapping completed for:
-Monoliths 8 and 9 from below water surface to invert of penstock intake, in each gate slot.
-Concrete entrances to each of three sluice gates.
NAP (USACE)
Crack mapping completed for:
-Complete DS face of the dam.
-US face of the dam to water surface.
MVK (USACE)
Investigated Face Drains in Monoliths 8 and 9 to determine where water is entering the drains.
Video inspected and pressure-jet cleaned all Joint Drains, and Foundation Drains.
Sufficient data gathered and investigations completed to pursue repair options.
$930k in FY15 Increment 4 Funds available for Headgate Bay Area Repair
General Historical Timeline (continued)
General Historical Timeline (continued)
Saw Cuts (TVA)
Vertical relief slots for M6-7 and M14-15
Headgate Bay Crack Mitigation (TVA)
Installation of six horizontal anchors through Monolith 8
Receipt of IIJA Funding
$3.3M for…
• Comprehensive Structural Analysis
• Geotechnical Investigation
• Spillway Anchor Installation
$400K for…
• Monoliths 1 and 2 Anchors
• Plans and Specs for Anchors
Report Findings and Outcomes
• ASR growth contributed to cracking but should slow in the future.
• 1969 Spillway anchors STRESSED ≈ 92% GROSS ULTIMATE TENSILE STRENGTH from ASR on unbonded/poorly prepared lift joints. Eventual anchor rupture is possible.
• Upper portions of M9 and M13 are expanding toward the spillway.
AE Design (Based on AE Recommendations from Stability Analysis)
Scope for FY26 Construction:
Install 12 spillway anchors with re-stressable anchors Install anchor load sensors.
Install inclinometers in M-9 and M-13.
Crack gauge and piezometer automation.
M-13
M-9
Spillway Anchors Concept
Instrumentation Concepts
Acquisition
• The Government is soliciting for Request for Proposals (RFPs) and will execute this acquisition through a negotiated procurement under FAR Part 15.
• The Government will evaluate the proposals in accordance with the following evaluation criteria: Technical Approach, Key Personnel, Past Performance, Small Business Participation Plan.
• The Government will award a firm-fixed-price contract to the responsible offeror whose proposal conforms with all the terms and conditions of the solicitation and whose proposal is determined to represent the overall best value to the Government, all factors considered.
Wilmington District POCs
• James Duke, Project Manager
• James.H.Duke@usace.army.mil.
• Walt Haven, ETL
• Walter.T.Haven@usace.army.mil.
• Richard Beckwith, ProjNet Manager
• Richard.E.Beckwith@usace.army.mil.
• Scott Surratt, ProjNet Manager
• Scott.Surratt@usace.army.mil
• George Clark, AE Contract Management
• George.E.Clark@usace.army.mil.
• Troy D. Small, Contracting Officer
• Troy.D.Small@usace.army.mil.
• Jenifer Garland, Contract Specialist
• Jenifer.M.Garland@usace.army.mil.
Bidder Inquiry Process
• Submit questions via ProjNet before COB 29 MAY 2026.
• ProjNet website: https://www.projnet.org.
• Use the Bidder Inquiry key 3359F6-8VVZJS.
Discussion & AHA Review
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