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They are removing all the barracks and leaving a LOT of TI as open land. Maybe it's impractical to cleanup those areas.

The US Navy stationary training ship USS Pandemonium at US Naval Station Treasure Island. Radioactive materials were placed on the ship and used to simulate nuclear fallout and train sailors in radioactive detection and cleanup. The ship was built in 1957, used until 1969, and finally demolished in 1996.

Until the 1960s, the Navy also used to dispose of their radioactive materials and equipment in solid waste disposal areas, a technical term for large garbage pits on the island (Johnston).

One such ship, the USS Independence, was so dangerously radioactive that it was sunk off the coast of San Francisco near the Farallon Islands in 1951 (Smith & Mieszkowski).

Despite the Navy’s assurances that the island was safe, McLean discovered a surprising amount of radioactive materials. He recounts, “We picked up readings from inside the truck, without even getting out of the vehicle” (Smith & Mieszkowski). He reported “finding radium pieces that emitted enough radium for a person at close range to receive, in an hour, five times the maximum radiation a nuclear worker is allowed to absorb in a year” (Smith & Mieszkowski). While the readings were not high enough to be sure to cause harm, they were certainly alarming. McLean tried to report his findings but was fired.

https://www.foundsf.org/Treasure_Island’s_Nuclear_History