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Topic: boulder

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January 22, 2014 at 11:58 AM

Rock was just the right size to get stuck in Bertha

A rock or concrete piece that workers found lodged in the Highway 99 tunnel machine cutter head is about 3.5 feet wide, state transportation spokeswoman Laura Newborn said today. That measurement is meaningful for a few reasons. Tunnel machine Bertha is designed to digest boulders of up to 3 feet in diameter, by pulling them through the conveyor system….


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