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Underground Utility Colour Codes Explained
Underground utility colour codes are used to differentiate and identify underground utilities to protect it from damage during excavation. There are different types of utilities and in order to tell them apart coloured lines, flags or sometimes both are used. They help mark the location and indicate the type of utility that is buried underground.


I had no idea! (via Tony Finch)
utilities  power  underground  excavation  digging  repair  urban 
11 days ago by jm
Forensic Topology
The sounds were not, however, caused by ghosts but by a group of three or four men at least to some degree professionally trained, the FBI now believes, in tunneling: a close-knit and highly disciplined team, perhaps from the construction industry, perhaps even a disgruntled public works crew who decided to put their knowledge of the city’s underside to more lucrative work. After all, Rehder explained, their route into the bank was as much brute-force excavation as it was a retracing of the region’s buried waterways, accessing the neighborhood by way of the city’s complicated storm-sewer network, itself built along old creek beds that no longer appear on city maps. As LAPD lieutenant Doug Collisson, one of the men present on the day of the tunnel’s discovery, explained to the Los Angeles Times back in 1987, the crew behind the burglary “would have had to require some knowledge of soil composition and technical engineering. … The way the shaft itself was constructed, it was obviously well-researched and extremely sophisticated.” Rehder actually goes further, remarking that when Detective Dennis Pagenkopp “showed crime scene photos of the core bit holes” produced by the burglars’ boring upward into the vault “to guys who were in the concrete-coring business, they whistled with professional admiration.”
cities  crime  architecture  digging  tunnels  subterranean  la  lapd  banks  via:bldgblog  sewers 
october 2013 by jm

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