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Preventing Concrete from polluting waterways

Preventing Concrete from polluting waterways

(OP)
I am involved in fixing a concrete bulkhead wall that is along a tidal water channel.  The owner of the channel is sensitive to the construction.  Over the bulkhead wall is an abandoned set of railroad siding and proposed building setback about 90ft from the channel.  

The wall is in disrepair due to spalling.  There are holes and crevices scattered througout along the face of the wall.  As of now, the plan is to have these holes filled from a raft floating in the channel.  Does anyone know of a way (or system) of applying concrete/grout to the wall without some of it spilling into the waterway?

RE: Preventing Concrete from polluting waterways

If you want to have complete assurance you are not going to spill anything into the waterway, you are going to have to build a cofferdam.  This is an increadibly expensive solution, but the owner needs to be practical in their expectations.  

If the owner of the waterway is so concerned about concrete getting into the waterway, they should have kept the wall in better shape.  The slight chance of spilling a little bit of cement into the channel is probably lower than the chance of contamination from the boat in the water.

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