POLICE have confirmed the factory involved in Thursday's chemical spill is the Environmental Treatment Solutions facility in Marshalls Lane, Blayney.
The spill has now been contained and the 500-metre exclusion zone lifted.
At this stage the EPA are assisting Fire and Rescue NSW in their clean up operation.
A SPOKESPERSON for Fire and Rescue NSW has confirmed crews were called to the factory at around 11.46am after reports emerged that workers had been complaining of fumes inside the facility.
Three crews were dispatched to the scene, one from Blayney and two from Bathurst.
One of the crews from Bathurst were specialists in hazardous materials.
They arrived to find there had been a chemical spill, measuring around 25 metres.
The 500-metre exclusion zone was enacted as crews used other chemicals to neutralise the spill while wearing fully encapsulated suites.
TWO buses have been employed to evacuate students from St Joseph's Catholic School after this morning's chemical spill.
The students are being taken to Centrepoint Sport and Leisure Centre under direction from the police, who have established a command post at the corner of Marshalls Lane and Gerty Street to deal with the emergency, which started at 11.40am today.
The four affected people taken to Orange Hospital for treatment are in a stable condition.
A further eight people were treated for exposure to chemical fumes at the scene, five of whom were transported to Bathurst Hospital.
Those five are also in a stable condition.
A CHEMICAL spill at a Blayney factory has forced the evacuation of nearby factories.
According to Fire and Rescue NSW eight people have been "affected" by the spill, though the extent of their injuries is unknown at this point.
Fire and Rescue NSW are also tweeting nearby factories are being evacuated and a 500-metre exclusion zone is in place.
A command centre has been established, while at least four of the affected people being taken to Orange Hospital for treatment.