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Utility location is the process of identifying and labeling public utility mains that are underground. These mains may include lines for telecommunication , electricity distribution , natural gas , cable television , fiber optics , traffic lights , street lights , storm drains , water mains , and wastewater pipes.
Underground Service Alert (USA) is a non-profit mutual benefit organization that links the excavation community and the owners of underground lines. Underground Service Alert has two separate call centers for California : Underground Service Alert of Northern California (USA North) and Underground Service Alert of Southern California (USA South ...
Borehole radars utilizing GPR are used to map the structures from a borehole in underground mining applications. Modern directional borehole radar systems are able to produce three-dimensional images from measurements in a single borehole. [8] One of the other main applications for ground-penetrating radars is for locating underground utilities.
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United States Airforce Plant 42 in Palmdale is rumored to have an underground network of tunnels connecting to nearby defense plants including Lockheed's Skunk works. Ft. McArthur Tunnel Complex: an abandoned World War II network connecting fortifications in San Pedro, CA. [10]
After she freed herself from slavery, she helped other enslaved people reach freedom in Canada. The town was a final stop on the Underground Railroad for many people. [13] Sandwich First Baptist Church – Windsor. [1] The church was built just over the border from the United States in Windsor, Ontario by blacks who came to Canada to live free.
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