FILE - In this Thursday Oct. 8, 2015 file photo, oyster boats deploy their dredges and work a small section of the Rappahannock River as the sun rises near White Stone, Va. On Wednesday, May 30, 2018, the Chesapeake Bay Foundation, which tracks pollution in America's largest estuary said that the health of the Chesapeake Bay is improving, but huge challenges remain as manure and storm water continue to flow into the watershed. (AP Photo/Steve Helber, File)
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