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  To establish a prima facie case of liability in a CERCLA cost recovery action, a plaintiff must prove: (1) that the site in question is a 'facility' as defined in § 9601(9); (2) that the defendant is a responsible person under § 9607(a); (3) that a release or a threatened release of a hazardous substance has occurred; and (4) that the release or threatened release has caused the plaintiff to incur response costs. See, e.g., Ascon Properties, Inc. v. Mobil Oil Co., 866 F.2d 1149, 1152-53 (9th Cir. 1989); Southland Corp. v. Ashland Oil, Inc., 696 F. Supp. 994, 999 ...