Question: Brooklyn Community Board 1 is delimited by  3.5 mi long tributary containing an estimated how many USgal of spilled oil?

Context paragraphs:
Brooklyn Community Board 10: Brooklyn Community Board 10 is a New York City community board that encompasses the Brooklyn neighborhoods of Bay Ridge, Dyker Heights, and Fort Hamilton.  It is delimited by Upper New York Bay on the west, Bay Ridge R.R. Yards and Long Island Rail Road on the north, 14th Avenue and Bay 8th Street on the east, as well as by Lower New York Bay on the south.

Brooklyn Community Board 1: Brooklyn Community Board 1 is a New York City community board that encompasses the Brooklyn neighborhoods of Williamsburg and Greenpoint.  It is delimited by the Newtown Creek and Queens Borough line on the east, Flushing and Kent Avenue on the south, and by the East River on the west.

Newtown Creek: Newtown Creek, a 3.5 mi long tributary of the East River, is an estuary that forms part of the border between the boroughs of Brooklyn and Queens, in New York City.  Channelization made it one of the most heavily used bodies of water in the Port of New York and New Jersey and thus one of the most polluted industrial sites in the US, containing years of discarded toxins, an estimated 30000000 USgal of spilled oil, including the Greenpoint oil spill, raw sewage from New York City’s sewer system, and other accumulation from a total of 1,491 sites.

Brooklyn Community Board 2: Brooklyn Community Board 2 is a New York City community board that encompasses the Brooklyn neighborhoods of Downtown Brooklyn, Brooklyn Heights, DUMBO, Vinegar Hill, Fulton Mall, Boerum Hill, Fort Greene, Brooklyn Navy Yard, Fulton Ferry, and Clinton Hill.  It is delimited by East River on the west and the north, by Kent and Classon Avenues on the east, and by Atlantic Avenue, Pacific Street, Fourth Avenue, Warren and Court Streets on the south.

Brooklyn Community Board 16: Brooklyn Community Board 16 is a New York City community board that encompasses the Brooklyn neighborhoods of Brownsville and Ocean Hill.  It is delimited by East 98th street, East New York Avenue, Ralph Avenue, Atlantic Avenue and Saratoga Avenue on the west, Broadway on the north, Van Sinderen Avenue on the east, as well as by the Long Island Rail Road on the south.

Brooklyn Community Board 12: Brooklyn Community Board 12 is New York City community board that encompasses the Brooklyn neighborhoods of Borough Park, Kensington, Ocean Parkway, and Midwood.  It is delimited by 61st Street on the west, 8th Avenue, 37th Street and Caton Avenue on the north, Coney Island Avenue, 18th Street, MacDonald Avenue and Long Island Rail Road on the east, as well as by Avenue P on the south.

Brooklyn Community Board 18: Brooklyn Community Board 18 is a New York City community board that encompasses the Brooklyn neighborhoods of Canarsie, Bergen Beach, Mill Basin, Flatlands, Marine Park, Georgetown, and Mill Island.  It is delimited by Nostrand Avenue on the west, the Long Island Rail Road on the north, Van Sinderen Avenue and Louisiana Avenue on the east, as well as by Shore Parkway on the south.

Brooklyn Community Board 7: Brooklyn Community Board 7 is a New York City community board that encompasses the Brooklyn neighborhoods of Sunset Park, Windsor Terrace, Greenwood Heights and South Park Slope.  It is delimited by Gowanus Bay on the west; by 15th Street and Prospect Park South West on the north; and by Caton Avenue, Fort Hamilton Parkway, 37th Street and 8th Avenue on the east, as well as by the Long Island Rail Road and Bay Ridge R.R. Yards on the south.

Brooklyn Community Board 17: Brooklyn Community Board 17 is a New York City community board that encompasses the Brooklyn neighborhoods of East Flatbush, Remsen Village, Farragut, Rugby, Erasmus and Ditmas Village.  The District is delimited by East 32nd Street, Glenwood Avenue, Nostrand Avenue, Foster Avenue and Bedford Avenue on the west, Clarkson Avenue, Utica Avenue and East New York Avenue on the north, East 98th Street on the east, as well as by the Long Island Rail Road on the south.

Bedford–Stuyvesant, Brooklyn: Bedford–Stuyvesant ( ; colloquially known as Bed–Stuy and occasionally Stuyford) is a neighborhood of 153,000 inhabitants in the north central portion of the New York City borough of Brooklyn.  The neighborhood is part of Brooklyn Community Board 3, Brooklyn Community Board 8, and Brooklyn Community Board 16.  The neighborhood is patrolled by the NYPD's 79th and 81st precincts.  In the City Council, the district is represented by Robert Cornegy of the 36th Council District.

Supporting paragraphs: Brooklyn Community Board 1 Newtown Creek
Answer: 30000000