A Spreckels Park business park that includes a dance studio and an engineering firm yielded an $8.4 million pot bust.The warehouse marijuana plantation uncovered Wednesday by Manteca Police officers led by Sgt. Chris Mraz led to connections in South San Francisco where officers served a second search warrant.Police were tipped off through an anonymous source. The marijuana could be smelled outside the warehouse loading dock even after police had confiscated the 584 mature plants weighing 2,029 pounds.Detectives met and later arrested Lan Dinh Vuu, 34, of Stockton, as he approached the door of the commercial warehouse at 1320 Dupont Court. They presented him with a search warrant for his leased location in the industrial area east of Spreckels Avenue facing the transition ramp to the 120 Bypass.