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michelle Bourke
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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
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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 (reportedly in 1975), and if so, by whom?I've seen many…Continue

Started this discussion. Last reply by Mark Drury Apr 14, 2010.


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At 1:42pm on April 11, 2010, Mark Drury said…
Welcome to the NWPRR Network, Michelle! Please take a look around and let me know if you have any questions or comments. I'm adding content daily and am actively recruiting new members -- please feel free to invite your own friends if you think they may be interested. Regards,

Mark Drury

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