Project Highlights:
- Extracted 1200 cubic yards of sediment from 8'x10' submerged box conduit
- Extracted 200 cubic yards of submerged debris
- Designed, fabricated & installed water control bulkheads
- Diving operations required linear foot penetrations
Dewatering system for sediments extracted from submerged subterranean culvert.
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The J. F. White diving team was hired by the MWRA to perform outfall cleaning of its underground conduit and to design, fabricate and install water control bulkheads for the conduit MWRA Outfall 023 is a subterranean double-box conduit running 300 linear feet from the Charlesgate Gate House beneath Storrow Drive into the Charles River.
Upon inspection, the J. F. White dive team discovered that the 8 foot by 10 foot barrel of this submerged concrete structure was completely obstructed by sediment and debris. By far the most difficult aspect of this project was accessing the submerged structure and working in the zero-visibility conditions. the only access to the conduit was through a single 30 inch by 72 inch deck plate.
Once the obstructed conduit was accessed, J. F. white's divers extracted embedded debris from the compacted sediments by hand using a 6 inch hydraulic submersible pump. Extracted materials ranged from medical waste, including hypodermic needles, to a variety of razor sharp metals. The debris was then moved to the deck opening and winched topside for disposal. 1200 cubic yards of sediment and 200 cubic yards of debris were removed according to the strict environmental guidelines of the Boston Conservation Commission. The MWRA outfall cleaning project shows J. F. White's ability to complete hazardous tasks in an environmentally responsible manner. |