Assertion: metal's use | /r/CapableOf | retain high lead concentrations
Facets:
value: before this time
type: TEMPORAL
Source sentences:
text: Although the use of leaded gasoline was largely phased out in North America by 1996, soils next to roads built before this time retain high lead concentrations.
text: Although the use of leaded gasoline was largely phased out in North America by 1996, soils next to roads built before this time retain high lead concentrations.