Lake Placid Dam February Project Summary

Date of Report: February 11, 2024

Recent Activities:

Waler obstruction removal was completed in Bay 1. The water has been lowered in Bay 1 to a level at which Sundt can begin working on the next obstacle, which is part of the existing concrete dam. Dam armoring excavation, filling, and concrete placement is ongoing (currently on the northeast side of the dam). Electrical duct bank installation and concrete placement has started.

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 recent 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 discussing possible workarounds/solutions.

[NOTE: Information in the Change Orders section is unchanged from the January 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 continue to cause 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 back by next month’s (March) construction meeting.

Upcoming:

In the next several weeks, we expect (1) work to adjust and secure the waler system in Bay 1 (this is the structural support of the sheet piling that is needed when Bay 1 is completely dewatered); (2) preparation of access for soil anchor installation in Bay 1; (3) installation of soil anchors in the north upstream retaining wall; (4) removal of the existing top part of the gate in Bay 1; and (5) continued dam armoring - earthwork and concrete placements.

Updated Substantial Completion Date: May 14, 2025

Recent Photographs of Construction Activity/Progress —