A company ran a hazardous waste disposal and recycling operation. Several companies sent their hazardous wastes to the site. The facility was improperly managed: waste was dumped on the ground, chemicals were mixed, and records were not kept about what was there. The EPA cleaned up the site under Superfund and sued the companies that sent their waste to the site because the owners of the site could not pay the bill. The companies responded that they were not liable under CERCLA because there was no evidence that the particular waste they sent had been improperly disposed of. Were they right?