Lake Placid Dam April Project Summary

Date of Report: April 20, 2024

Recent Activities:

The Bay 1 cofferdam excavation was completed and the concrete seal slab was placed on top of the excavation’s base. The first lift of concrete in Bay 1 was completed. This is the first structural concrete pour of the project. Bay 1 foundation reinforcement steel is ongoing for subsequent concrete lifts/pours. Existing structural concrete demolition is ongoing. Dam armoring is ongoing.

Change Orders (pending):

1. Pending: Steel was previously ordered for the gantry crane bridge which will ultimately be installed over the top of the dam to set and remove stop logs. Upon field verification, it was discovered the steel that was ordered was too short and needs to be bent in a different configuration. This survey alignment adjustment and associated subsequences are being discussed by Black and Veatch (engineers), GBRA, Sundt, and Seguin Fabricators.
2. Pending: During the excavation of Bay 1, more debris and obstructions were discovered. Bay 1 has the original bypass gates that were used when the dam was originally built (circa 1927). Part of the concrete in the original bypass gates is obstructing the placement of the waler system. Black and Veatch, Sundt, Sundt's structural engineers, and GBRA are currently negotiating this change order.
3. Pending: The January 2024 flood event costs and time are being negotiated by GBRA, Black and Veatch and Sundt.
4. GBRA has asked Sundt for pricing to include a gantry crane to the Lake Placid project which will be used to install stop logs when a gate may require maintenance.

[NOTE: Information in Items 1 and 3 of the Change Orders section is unchanged from the March 2024 Project Summary.]

Schedule:

1. Sundt is continuing to evaluate ways to regain time lost from dealing with unanticipated debris discovered upstream of Bay 1.
2. Difficulties and obstructions on the existing dam in Bay 1 have caused issues with completely dewatering Bay 1. Sundt, Black and Veatch, and GBRA are working toward a solution(s) to these issues and should be reporting a proposal in the next couple of months.

Other Items of Interest:

1. Steel Fab gate manufacturing is on schedule. Steel Fab is the company building the new steel gates. (See pictures included with this report, below.) Note: The pictures show the top and bottom of a gate; they are fabricated in pieces and assembled on site because they are too large to ship and install as a single unit.
2. The steel gates are scheduled to be delivered at the end of 2024 or the beginning of 2025.
3. The Hydraulic Pressure Unit (HPU) is scheduled for testing in late April/early May 2024.
4. Steel gate fabrication and assembly/testing of the HPU is inspected/overseen by GBRA, Black and Veatch, and Sundt.

Upcoming:

In the next several weeks, we expect (1) installation of dowels and rebar, and placement and curing of the concrete foundation for the second lift of concrete in Bay 1; (2) completion of existing structural concrete demolition in Bay 1; (3) installation of dowels and rebar, and work for the Bay 1 slab foundation; and (4) continued dam armoring.

Updated Substantial Completion Date: May 14, 2025

Recent Photographs of Construction Activity/Progress —