Northwestern Pacific Railroad Network

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michelle Bourke's Discussions (1)

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Alto Tunnel 1975 lean concrete fill near North Portal - Jacobs Assoc. report indicates no proof exists that this was ever done

Can anyone tell me how to verify that a lean concrete plug was in fact poured near the north portal of the alto tunnel in corte madera (rep…

Started by michelle Bourke in General

2 Apr 14, 2010
Reply by Mark Drury


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