An underwater inspection was performed determining that a sill plate was deteriorated beyond repair and then confirmed by engineering review. Using hydraulic underwater cutting equipment the old sill plate and concrete was carefully removed.

Concrete forms were fabricated and installed underwater allowing UCC to place new concrete. Installation consisted of rigging the new stainless steel sill plate into position within tolerances of 1/4” or less using a floating work platform. The sill plate was anchored to the structure and welded to the vertical seals after correct positioning was confirmed. Upon completion the gate was cycled several times, confirming a good seal with no measurable leakage.