<http://webisa.webdatacommons.org/prov/65551142>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/121393326> .
<http://webisa.webdatacommons.org/121393326>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<usgs.gov> .
<http://webisa.webdatacommons.org/121393326>	<http://www.w3.org/ns/prov#value>	"Groundwater and wells are vulnerable to naturally occurring contaminants such as radon, uranium and arsenic as well as commonly used manmade compounds, including fertilizers, septic-tank leachate, solvents and gasoline hydrocarbons." .
<http://webisa.webdatacommons.org/prov/65909195>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/121393326> .
<http://webisa.webdatacommons.org/121393326>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .