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Board approves change orders for Spring Street interceptor and wastewater plant repairs
Summary
The board approved change orders after contractors encountered an unknown obstruction under the railroad during the Spring Street sewer project and after wind damage exposed micro-fractures on the wastewater plant's secondary-digester roof; the interceptor work may add about $110,000 and digester replacement about $135,000, staff said.
The Board of Public Works on May 12 approved two construction change orders related to sewer and wastewater work.
For the Spring Street sanitary sewer interceptor, the contractor encountered an unexpected obstruction when boring beneath the railroad and later had to hand-mine the area; railroad inspectors halted the operation. Staff reported roughly $110,000 in contractor work that must be repeated under the new alignment and recommended approval of a change order to address the extra work. Staff said contingency carried into the year should cover the cost and that the project remains under budget overall.
At the wastewater treatment plant, staff said the membrane roof support for a secondary anaerobic digester sustained wind damage during a period when the unit was taken out of service; an engineering evaluation found micro-fractures in structural steel and recommended full replacement of the structure. The estimated cost for that work is about $135,000, and lead times put installation into October, extending project completion. Staff sought and the board approved a change order so material can be ordered and work scheduled. Staff said insurance has been queried but that age and condition make a full insurance recovery unlikely.
Both change orders were moved and approved by voice vote; staff explained funding will come from project contingencies and plant-service accounts and noted the city remains near its budget projections for the larger projects.
