About: http://webisa.webdatacommons.org/210169773

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	Floatable material such as oil and grease may be suspended in nitrogen foam at the water surface of wastewater collection wet well structures and, with interaction in air, may dry to a hardened surface material.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es