WBUR: Morning light on stream
WBUR: Cold morning in Chelsea
WBUR: Water sampling near train tracks
WBUR: Scientist tests water sample
WBUR: Scientist records data
WBUR: Pulling trash from stream
WBUR: Muddy flats in Chelsea
WBUR: Scientist Patrick Herron
WBUR: Polluted grounds near creek
WBUR: Traffic stops for drawbridge
WBUR: Outbound from Chelsea Creek
WBUR: Zao Express tanker enters harbor
WBUR: Tanker clears drawbridge
WBUR: Noontime on McArdle Bridge
WBUR: Tanker just off McArdle Bridge
WBUR: Fuel barge on Chelsea Creek
WBUR: Busy navigation channel
WBUR: Brownfield along creek
WBUR: Condor Street Urban Wild
WBUR: Polluted creek banks
WBUR: Brownfield on the Chelsea Creel
WBUR: Chassis sunk in creek mud
WBUR: Activist John Walkey
WBUR: Smokestacks & tankers
WBUR: 3 tankers under the Tobin
WBUR: Fuel tanker heads for Everett
WBUR: Outbound Tanker