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<http://webisa.webdatacommons.org/prov/478034979>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/90508221> .
<http://webisa.webdatacommons.org/90508221>	<http://www.w3.org/ns/prov#value>	"9 Groundwater contamination is a problem." .
<http://webisa.webdatacommons.org/90508221>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<ca.gov> .