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Staged Reconstruction Of A Major Interceptor Without Service Interruption
Rehabilitation Of The Oakland Macomb Interceptor Drain
EDITOR’S NOTE: This is the second installment of a two-part series. Part 1 was published in the October edition of Underground Construction.
Following a major collapse of a section of the Oakland Macomb Interceptor System in 2004, the Detroit Water and Sewerage Department performed an extensive inspection of the 42-mile system, and began a major program of rehabilitation of various distressed areas. The inspection revealed significant and widespread deterioration, hydrogen sulfide attack and loss of ground through cracks in the monolithic concrete sewer liner. Much of the sewer had deteriorated to a PACP rating of four and 5, necessitating immediate attention.
By 2009, most of the eastern half of the system (consisting of the Romeo and Macomb arm) had been completed. At that time, some remedial repairs had been performed in the western half of the system (designated as the Oakland and Avon Arms), although there were significant repairs yet to be made when it was transferred to the newly formed “Oakland Macomb Interceptor Drain Drainage District” (OMIDDD) in fall 2009.
The OMIDDD is currently in the process of making these major repairs. The repairs to this are being conducted to minimize risk of future collapses and prepare the interceptor for many more years of service to the community. Flow control structure construction is nearly finished and the first of several sewer repair contracts were bid in July 2011. Total repair costs were estimated to be in the range of $160 million and will require approximately five years to complete.