Depending on the size of the spills, they can be cleaned up via first responders using spill kits or Incident Commanders and external spill cleanup providers using larger spill cleanup resources.
Wear proper PPE when cleaning up spills.  Remove or turn off any ignition sources near the spill to minimize any additional impact.  Close drains that may lead to storm/city sewers.  Depending on the type of chemical spill, compatible neutralizing chemicals and absorbents must be used for cleanup of chemical.  Follow directions for cleanup and disposal of spill material in accordance with the safety data sheet (SDS) for the material.