Thursday, March 21, 2013

First Day of Spring at Calaveras Dam

John Rocca, our Field Operations Manager for the Calaveras Dam Replacement Project, stands on the second bench of the existing Calaveras Dam.  Behind John is the where the replacement dam is currently being constructed with targeted completion at the end of 2017.

The left side of the photo shows the stilling basin cut, part of the left abutment of the dam where we are excavating and reinforcing the slope. Shown on the right center of the photo, this hill is referred to as the right abutment where excavations are largely complete. Crews are working on treating the foundation of the future dam.

For more project info, contact or call our 24-hour answer line at 866-973-1476.

Photo courtesy of Robin Scheswohl, SFPUC Photographer

Wednesday, March 6, 2013

Local Cavers and the New Irvington Tunnel

They kindly attended one of our meetings, and we, in turn, attended their’ s. We were delighted to meet members of the National Speleological Society’s San Francisco Bay Chapter (SFBC) at one of our quarterly coffees in Fremont a while back.  Much to our surprise, they saw our New Irvington Tunnel (NIT) blog and became interested in the project. They invited us to speak at one of their future meetings about our man-made ‘cave’. Last week Project Manager David Tsztoo and Geologist Rebecca Fusee made a presentation at the SFBC general meeting and  ‘rocked out’ as it were by talking about the NIT Project and the complex geology it passes through.
The members of the SFBC Grotto sure know a thing or two about cave exploration, geology, conservation and organizing caving trips with fellow cavers. It was a great experience for our team to have the opportunity to share knowledge about tunneling with this group. Beautiful photos and rock samples were shown of the geologic features from the tunnel excavation, consisting of primarily sandstone, siltstone, shale, and chert ranging from Miocene to Cretaceous age (dated at 5 to 144 million years old).  Action photos of our road header equipment used in tunneling were featured during the presentation.  We look forward to more talks about rocks with the SFBC!
To learn more about the National Speleological Society San Francisco Bay Chapter, visit their website at
For more information on the New Irvington Tunnel Project, subscribe to our blog, or call our 24 hour answer line at 866-973-1476 or email
New Irvington Tunnel Project Geologist Rebecca Fusee
shares some rock samples from the tunnel with attendees

L to R: John Tinsley, Tom Mathey, NIT Project Geologist Rebecca Fusee, NIT Project Manager David Tsztoo, Alan Chern, Matt Bowers