<http://webisa.webdatacommons.org/prov/298848672>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/66531275> .
<http://webisa.webdatacommons.org/66531275>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/66531275>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<state.or.us> .
<http://webisa.webdatacommons.org/prov/285223108>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/66531275> .
<http://webisa.webdatacommons.org/66531275>	<http://www.w3.org/ns/prov#value>	"meeting the specifications in OAR 340-073-0041. (i) The top of the sand filter area must be backfilled with a soil cover free of rock, vegetation, wood waste, and other materials that may harm the filter." .