A sinkhole that formed in January behind Bertha’s cutting face led independent experts to emphasize stricter protocols before contractors continue the Highway 99 tunnel dig under Seattle’s Alaskan Way Viaduct.
from
http://www.seattletimes.com/seattle-news/transportation/sinkhole-led-to-big-worries-over-berthas-tunnel-digging-work/?utm_source=RSS&utm_medium=Referral&%23038;utm_campaign=RSS_seattle-news
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