{"id":2516,"date":"2009-06-06T09:16:54","date_gmt":"2009-06-06T16:16:54","guid":{"rendered":"http:\/\/montaraventures.com\/blog\/?p=2516"},"modified":"2009-06-06T09:16:54","modified_gmt":"2009-06-06T16:16:54","slug":"halfway-to-pacifica","status":"publish","type":"post","link":"https:\/\/montaraventures.com\/blog\/2009\/06\/06\/halfway-to-pacifica\/","title":{"rendered":"Halfway to Pacifica"},"content":{"rendered":"<p><center>State as of June 1, 2009<br \/><img decoding=\"async\" src=\"https:\/\/montaraventures.com\/blog\/wp-content\/2009\/06\/tunnel-overviewjpg.jpg\" alt=\"Overview of Devil's Slide tunnel as of 6\/1\/2009\" \/><\/center><br \/>\n<br \/>\nFor those of you who do not live on the San Mateo Coastside, you may not be tracking the $300M project that has been underway for a few years now to dig two tunnels through San Pedro Mountain between Montara and Pacifica by passing the always treacherous Devil&#8217;s Slide portion of Highway 1. This project was contemplated for decades with many options presented, finally, in 1995 the residents of San Mateo voted on Measure T giving the project a kick start. Active construction got under way in fall of 2007 and should be completed by 2011.<br \/>\n<br \/>\nThus far, two, 1,000 foot bridges and the tunnel maintenance facility have been completed and as you can see from the image above (courtesy of <a href=\"https:\/\/www.dot.ca.gov\/dist4\/\" target=\"_blank\" >Caltrans<\/a>) the tunneling is now at the halfway point. Rather than using one of the large tunnel boring machines, the team opted for the New Austrian tunneling method which consists of removing material (scraping, digging, and blasting as conditions dictate) and then immediately erecting a set of steel arches which are covered in concrete so that only the active digging area is the only spot unsupported at any given time.<br \/>\n<br \/>\nI&#8217;ve posted some photos of the project below, enjoy!<br \/>\n<br \/>\n<center><small><br \/>\nTunnel Entrances at the south side of San Pedro Mountain<br \/>\n<img decoding=\"async\" src=\"https:\/\/montaraventures.com\/blog\/wp-content\/2009\/06\/tunnelentrances.gif\" alt=\"Tunnel entrances to Devil's Slide tunnel\" \/><br \/>\nA view of the tunnel interior<br \/>\n<img decoding=\"async\" src=\"https:\/\/montaraventures.com\/blog\/wp-content\/2009\/06\/tunnel-interior.gif\" alt=\"Devil's Slide tunnel interior\" \/><br \/>\nAnother view of the tunnel interior<br \/>\n<img decoding=\"async\" src=\"https:\/\/montaraventures.com\/blog\/wp-content\/2009\/06\/ti-lighted.gif\" alt=\"Lighted Devil's Slide tunnel interior\" \/><br \/>\nA view out of the tunnel looking south toward Montara<br \/>\n<img decoding=\"async\" src=\"https:\/\/montaraventures.com\/blog\/wp-content\/2009\/06\/viewoutoftunnel.gif\" alt=\"A view out the tunnel to the south\" \/><br \/>\nArray of equipment being used close to the working face<br \/>\n<img decoding=\"async\" src=\"https:\/\/montaraventures.com\/blog\/wp-content\/2009\/06\/equipment.gif\" alt=\"Digging equipment in Devil's Slide tunnel\" \/><br \/>\nContinuous digging machine, the head breaks up the rock at the working face and arms collect the scree onto a conveyor belt which loads into a truck to send to the fill pit<br \/>\n<img decoding=\"async\" src=\"https:\/\/montaraventures.com\/blog\/wp-content\/2009\/06\/continuousdiggingmachine.gif\" alt=\"Continuous digging machine at Devil's Slide tunnel\" \/><br \/>\nWorking on the arch, drainage, and concrete cover used in the New Austrian tunnel method<br \/>\n<img decoding=\"async\" src=\"https:\/\/montaraventures.com\/blog\/wp-content\/2009\/06\/archesandconcrete.gif\" alt=\"Arches and Concrete in Devil's Slide Tunnel\" \/><br \/>\nDigging with an excavator at the working face<br \/>\n<img decoding=\"async\" src=\"https:\/\/montaraventures.com\/blog\/wp-content\/2009\/06\/workingattheface.gif\" alt=\"The working face of the Devil's Slide tunnel\" \/><br \/>\n<\/small><\/center><br \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>State as of June 1, 2009 For those of you who do not live on the San Mateo Coastside, you may not be tracking the $300M project that has been underway for a few years now to dig two tunnels through San Pedro Mountain between Montara and Pacifica by passing the always treacherous Devil&#8217;s Slide [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,3],"tags":[863,865,866,864,862],"_links":{"self":[{"href":"https:\/\/montaraventures.com\/blog\/wp-json\/wp\/v2\/posts\/2516"}],"collection":[{"href":"https:\/\/montaraventures.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/montaraventures.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/montaraventures.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/montaraventures.com\/blog\/wp-json\/wp\/v2\/comments?post=2516"}],"version-history":[{"count":4,"href":"https:\/\/montaraventures.com\/blog\/wp-json\/wp\/v2\/posts\/2516\/revisions"}],"predecessor-version":[{"id":2529,"href":"https:\/\/montaraventures.com\/blog\/wp-json\/wp\/v2\/posts\/2516\/revisions\/2529"}],"wp:attachment":[{"href":"https:\/\/montaraventures.com\/blog\/wp-json\/wp\/v2\/media?parent=2516"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/montaraventures.com\/blog\/wp-json\/wp\/v2\/categories?post=2516"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/montaraventures.com\/blog\/wp-json\/wp\/v2\/tags?post=2516"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}