About: http://webisa.webdatacommons.org/144837767

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Hence, most subways involve borings at intervals of 100???500 feet to observe the water table and to obtain undisturbed samples for testing strength, permeability, and other engineering properties of the soil.
http://www.w3.org/ns/prov#wasQuotedFrom	britannica.com