Follow us:

The Today File

Your guide to the latest news from around the Northwest

April 8, 2014 at 3:31 PM

A noise wall for work on tunnel machine Bertha

Workers at the Highway 99 tunnel site are building a plywood noise wall this week, so Seattle Tunnel Partners can get permission from the city to work at night.

STP will dig an 83-foot diameter, 120-foot deep circular pit to perform front-end repairs on the drill called Bertha, which has advanced only four feet since Dec. 6.  The job will include full replacement of the main bearing, not just repair, according to Todd Trepanier, Highway 99 program administrator for the state Department of Transportation.  Sand has penetrated past several rubber seals, and likely contributed to rapid overheating on Dec. 6-7 and Jan 28-29.

The wall will be half the height of the Alaskan Way Viaduct, and is being attached to Viaduct beams, from approximately South Jackson Street to South Main Street.  It is meant to block noise from reaching Pioneer Square buildings, including low-income apartments next to the Viaduct.

Chris Dixon, STP’s project director, has previously said he would aim for a Sept. 1 restart, to continue drilling under the Viaduct toward South Lake Union.  However, machine-builder Hitachi has yet to release its full repair plan, something state DOT said was expected by late March. In fact, Hitachi and STP held an initial high-level meeting just last week, so it’s reasonable to suspect that Dixon’s Sept. 1 goal will slip. Trepanier told reporters he hasn’t been notified of any change to the restart date.

Comments | More in General news, Traffic & Transit | Topics: bertha, Highway 99 tunnel, Pioneer Square

COMMENTS

No personal attacks or insults, no hate speech, no profanity. Please keep the conversation civil and help us moderate this thread by reporting any abuse. See our Commenting FAQ.



The opinions expressed in reader comments are those of the author only, and do not reflect the opinions of The Seattle Times.


Advertising
The Seattle Times

The door is closed, but it's not locked.

Take a minute to subscribe and continue to enjoy The Seattle Times for as little as 99 cents a week.

Subscription options ►

Already a subscriber?

We've got good news for you. Unlimited seattletimes.com content access is included with most subscriptions.

Subscriber login ►
The Seattle Times

To keep reading, you need a subscription upgrade.

We hope you have enjoyed your complimentary access. For unlimited seattletimes.com access, please upgrade your digital subscription.

Call customer service at 1.800.542.0820 for assistance with your upgrade or questions about your subscriber status.

The Seattle Times

To keep reading, you need a subscription.

We hope you have enjoyed your complimentary access. Subscribe now for unlimited access!

Subscription options ►

Already a subscriber?

We've got good news for you. Unlimited seattletimes.com content access is included with most subscriptions.

Activate Subscriber Account ►