ALBANY, N.Y. (AP) — General Electric Co. said Monday it will study the possibility of expanding dredging in a contaminated portion of the upper Hudson River after a request by New York state Comptroller Thomas DiNapoli.

GE, which released poly-chlorinated biphenyls, or PCBs, into the river decades ago, is preparing to begin a fourth season of dredging as part of a federal Superfund project that is expected to cost more than $1 billion.