A smoldering chemical reaction brewing deep inside the recently closed Chiquita Canyon Landfill in Castaic now threatens to consume an entire 160-acre canyon of buried waste, endangering a storage area for hazardous liquid waste, according to state officials. … State regulators worry that damage to the tank farm would cause chemical-laden leachate to spill onto the landfill’s surface and potentially into nearby sources of water. State agencies have ordered Waste Connections to relocate the tank farm to prevent hazardous chemicals from seeping into groundwater or spilling into storm drains that feed into the Santa Clara River.