An investigation found that an independent waste hauler had previously taken drums of toxic liquid from one of the companies and deposited them at a former chicken farm, sometimes pouring out the contents.
Lähemal uurimisel selgus, et üks transpordiettevõte oli vedanud ühe keemiafirma konteinereid, mis sisaldasid mürgiseid vedelikke, endisesse kanafarmi ning osa vedelikest maha valanud.