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March 11, 2004



            Additional visual inspections yesterday (Wednesday, March 10) of the ruptured Sand Island wastewater force main detected holes in the pipe that apparently were caused by long-term corrosion.

Diver Greg West from Sea Engineering, Inc., discovered three holes approximately 5 inches wide in the last section of the 66-inch-diameter steel force main coming from under the harbor.  The three holes are very close to being directly underneath the ground surface sewage spill that began in the park last Thursday morning.  It appears that grit in the line wore away the internal epoxy coating and exposed the steel to long-term corrosion. 

 Fortunately, the holes that were found are in the center of the area that is being prepared for any excavation, if required.  A combination of steel sheet piles and jet grouting is being installed to stabilize the surrounding soil mass and to seal out the ground water so the soil can be removed from above the pipe with a minimal dewatering operation. The damaged pipes could then be removed and replaced with new pipes and connections, if this proves to be necessary. 

 West also found potential leak conditions at two joints in the 78-inch pipe on the Ewa side of the pressure manhole where he entered the pipe. 

 The City and its consultants and contractors are meeting today to determine the best corrective measures to be used to fix the problems discovered by the internal underwater inspections of the force main.

 .For more information, contact City Environmental Services Director Frank Doyle at 692-5159.




Thursday, March 11, 2004

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