During the sheet pile driving last week, we encountered a concrete foundation 4 feet under the lake bed that we were not expecting and caused the work to come to a stop. This morning we did more exploring and discovered a foundation wall as depicted in image below. This was likely installed prior to the dam, possibly as a temporary embankment of the wetland.
We will be removing the angled sections so we can install the steel pile wall as designed. This week, V3 will be prepping the entire stretch so the sheet pile driving can resume next week, hopefully unencumbered.
In order to remove the concrete, we need to lower the lake an additional 2′ for several days. We will keep this lowered level as short as possible.