Nurses & residents get commitment for full investigation into dangers & public meetings before tar sands can be processed by Valero Oil. CNA RNs from 5 LA Southbay hospitals closest to the major oil refineries attended a special meeting arranged for CNA and neigborhood groups who oppose “tar sands†crude being processed in Wilmington’s Valero refinery. Tar Sands crude is a thick, dirty crude high in sulphur and much more toxic than regular crude. It has been condemned by leading environmental scientists as ‘extremely dangerous’ and the ‘beginning of the end’ where pollution will tip global warming until the point of no return.