After nearly two decades of planning, the Georgia Ports Authority (GPA) this month has begun a $706- million deepening of the Port of Savannah harbor by 5 ft. It formally signed a Project Partnership Agreement (PPA) Oct. 8 with the Army Corps of Engineers. The Corps expects bids on Oct. 29 for a dredging contract for 19 of 40 miles of entrance channel, estimated at $100 million. Another estimated $75-million contract to build dissolved oxygen injection systems should receive bids Oct. 31, says James McCurry, GPA senior director of government affairs.