In re Hanna, 168 B.R. 386, (9th Cir. B.A.P. 1994)
          Clean-up costs arising solely from pre-petition releases of petrol products were not entitled to administrative expense

In re Dant & Russell, 951 F.2d 246 (9th Cir. 1991)
          Apportionment of CERCLA clean-up costs

In re Jensen, 127 B.R. 27 (9th Cir. B.A.P. 1991) aff’d. 995 F.2d 925 (9th Cir. 1993)
          Environmental claims arise upon debtor's conduct

In re Bergsoe Metal Corp., 910 F.2d 668 (9th Cir. 1990)
          Secured party that does not participate in mgmt of debtor is not an 'owner'

Louisiana-Pacific v. ASARCO, 909 F.2d 1260 (9th Cir. 1990)
          Traditional rules of states re: successor liability apply