Lake Placid Dam January Project Summary

Date of Report: January 12, 2024

Recent Activities:

Bay 1 was partially dewatered to demo existing bypass gates. Wildlife relocation was completed upon the partial dewatering of Bay 1. Dam armoring excavation, filling, and concrete placement is ongoing (currently on the northeast side of the dam). Electrical demolition is ongoing. Seguin Fabricators has nearly completed the miscellaneous steel it was contracted to provide.

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.

Schedule:

1. Sundt is continuing to evaluate ways to regain time lost from dealing with unanticipated debris discovered upstream of Bay 1.
2. Pending change orders will include additional time to be added to the Contract; however, the amount of effort cannot be quantified at this time, because Sundt is still addressing the issues identified in the pending change orders (described above).

Upcoming:

In the next several weeks, we expect (1) work to secure the waler system (this is the structural support of the sheet piling that is needed when Bay 1 is completely dewatered); (2) to fill in the bypass gates with concrete in order to place the waler at the proper elevation; (3) continued Bay 1 cofferdam excavation work; (4) continued work to install soil anchors in the north upstream abutment wall; (5) continued dam armoring - earthwork and concrete placements; and (6) continued electrical demolition work.

Updated Substantial Completion Date: May 14, 2025

Recent Photographs of Construction Activity/Progress —