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並前往https://gis.dot.nh.gov/bridge_plan/154-123-Concord.1974-02.pdf

154-123-Concord.1974-02.pdf - NH.gov

B.F.B. = Bottom of Abut. ... B.F.B.. Abutment B Borings. 18. Ground El.223.0. Fine Sand ... 226 #9 AF2 (Spaced @ 9" between piles) (113 topt 113 bottom).

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