Friday, March 16, 2012

Download the 2012 New Irvington Tunnel Fact Sheet

We have updated our project fact sheet as we move into Year 2 of the New Irvington Tunnel Project. The fact sheet highlights our progress during the first year of construction and provides an overview of our work in 2012.


Click here to download the 2012 New Irvington Tunnel Fact Sheet!

Tuesday, March 13, 2012

Boom Goes the Dynamite!


Well, technically the “Boom” is not as loud as one would imagine. The Calaveras Dam Replacement Project has begun controlled detonation activity to produce the hard rock required for construction of the dam. Due to the existing conditions of the rock, we must use controlled detonation to break down the surface. Prior to each blast, numerous steps are taken for safety and extensive watering of the blast area is done to ensure dust emissions are kept to a minimum. Pre-construction surveys are also performed prior to each blast for removal of any special species.

For the first initial blast, it took four days to drill 76 holes to place the explosives. Over 10 tons of explosives were used, blasting a total of 16,000 cubic yards of material, to be used for dam construction.

Controlled detonations only occur at the Calaveras Dam project site within SFPUC property. Detonations will continue intermittently through the end of the project in early 2015, only during daytime hours, Monday through Friday.

For more project info, contact us at our 24 hour answer line at (866) 973-1476 or email mle@sfwater.org

Wednesday, March 7, 2012

Spring Forward, Fall Back


With Daylight Savings around the corner don’t forget to change your clocks before you go to sleep on Saturday March 10. The phrase “Spring forward, fall back” is good way to remember which way to set the time.


Miners at the New Irvington Tunnel Project have taken this phrase to heart- at least the Spring forward part. As shown in the above chart, work crews broke or tied the previous daily project record of tunneling, 70 feet, with 70, 87 and 98 foot days! Miners have been averaging 45 feet of excavation per day but ideal ground conditions allowed crews to advance rapidly. All told 378 feet was excavated for the week recently also shattering the previous weekly record of 253 feet.

Some say the extra sunlight gained from Daylight Savings increases worker production. Underground, the sun isn’t a factor but that doesn’t mean the miners can’t join in on the fun!