About: http://webisa.webdatacommons.org/221540541

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	Toe reflections may be observed up to 30 pile diameters in favourable conditions but defects such as cracks or splices prevent the low energy wave detecting deeper defects.
http://www.w3.org/ns/prov#wasQuotedFrom	testpile.com