We are now using the 6” P&S crane-controlled, or diver-controlled systems to move debris up to 5” diameter with no problems (that’s right… a 6” pump can pass a 5” rock). A few months ago, we were faced with the possibility of not being able to complete our project during this fish window, but I did some research online and found P&S. Our dredge permit only allows us to hydraulically dredge the material and so a clam bucket is not an option. The Toyo removes material smaller than 1 ¾” and leaves a pile of clean rock below the intake that it’s unable to pass. The project I’m currently on we brought a 6” Toyo pump because the seafloor was to be consisting of sand and silt, but it’s actually a mixture of sand, silt, and rocks up to 8” diameter. I’ve been in the marine construction industry for 26 years and have done my share of dredging using various sizes of submersible trash pumps.
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