*
accident/spill on a HWS
*
accident/spill during the treatment, storage, transportation or
disposal of HW
* persons knowingly or unknowingly
exposing themselves to HW without proper protection (children
playing in fenced off areas, adults trespassing, persons working
with HW without proper protection)
*
an uncontrolled, illegal or unwanted release of a hazardous substance
into the environment