The Navy provided a map of sites and trenches handled by Tetra Tech. It is unclear if the map represents the entire scope of Tetra Tech's work, which spans more than a decade.

"Future property transfer will only be allowed after areas previously tested by Tetra Tech EC have been retested and appropriately cleared of radiological contamination," Navy program manager Derek Robinson said.

The Navy also provided maps of regions where other contractors potentially scanned buildings and soil, but did not provide a map of specific buildings or sites.

Tetra Tech said in a statement that it stands by its work at the shipyard and says it offered to pay for an independent contractor to test the work.