<http://webisa.webdatacommons.org/prov/501007848>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/251009857> .
<http://webisa.webdatacommons.org/251009857>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<epa.gov> .
<http://webisa.webdatacommons.org/251009857>	<http://www.w3.org/ns/prov#value>	"contaminants, particularly metals, and their concentrations." .
<http://webisa.webdatacommons.org/251009857>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .