The construction of a 20-km tunnel that travels some 6,900-ft below ground has finally restarted after being broken down for several months after being damaged by a rock burst. The Los Olmos tunneling project will bring rain forest water to thirsty coastal Peruvian residents by means of a water supply tunnel under the Andes Mountains. I first posted about the project in 2008, but it was about 4-months ago that ENR reported that the TBM was seriously damaged by rock bursts and the parts were not available to fix it. The rock bursts continue, and now it appears that the project is over 2-years behind the original schedule, breaking through in Spring of 2012 with tunnel completion following 6-months behind. [Source: ENR: Engineering News Record. Image: Odebrecht]
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12 Miles of Tunnels for D.C. Sewer
In Washington D.C., the D.C. Water and Sewer Authority (D.C. WASA) finalized a lont-term plan in 2002 aimed at reducing combined sewer outfalls into the Potomac River and its tributary, the Anacostia River. A major portion of this plan is a $2.2 Billion (US) deep tunnel program to handle excess stormwater flows and prevent the combined sewage from being discharged into the environment. Read on for a map and more info. (Photo of Anacostia River, by D.C. WASA)