The Occupational Safety and Health Administration (OSHA) define a hazardous chemical as any chemical which is a physical hazard or a health hazard. 

• Physical hazard means a chemical for which there is evidence that it is a combustible liquid,  a  compressed  gas,  explosive,  flammable,  an  organic  peroxide,  an  oxidizer,  pyrophoric, unstable (reactive), or water-reactive. 

• Health hazard means a chemical for which there is evidence that acute (immediate) or chronic (delayed)  health  effects  may  occur  in  over-exposed  people.   

RISPL provides environmental clearance consultancy services to all new isolated storage and handling of hazardous chemicals industrial projects (As per threshold  planning  quantity  indicated  in  column  3  of  schedule  2  &  3  of  MSIHC  Rules  1989 amended 2000) including expansion and modernization require prior environmental clearance.  All the projects are classified into Category B.

Note:  

• The recycling units registered under the Hazardous Substances Management Rules, are exempted from purview of notification. 
• Plants/units other than power plants (given against entry no. 1 (d) of the Notification schedule), based on municipal solid waste (non-hazardous) are exempted. (Municipal solid waste in the context of this specific sector refers to segregated organic portion of municipal solid waste excluding recyclables and converted to pellets for use as a fuel.)

Besides there are general conditions, when it applies, a Category B project will be treated as Category A project. 

In case of Expansion or Modernization of the developmental Activity:

Any  developmental  activity,  which  has  an  EIA  clearance  (existing  facility),  when  undergoes  expansion  or  modernization  (change  in  process  or  technology)  with  increase  in  handling  capacity  beyond  the  list  of  products  cleared  in  the  issued  clearance is required to submit new application for EIA clearance.