EMPLOYEES PERFORMING DEMOLITION TO DISMANTLE AN IDLE PLANT, WHICH WAS PRESENTED TO US AS THOROUGHLY FLUSHED AND DRAINED NUMEROUS TIMES, WERE SPRAYED WITH CONCENTRATED CAUSTIC SODA SOLUTION WHE N THEY BROKE INTO A LINE THAT HAD NEVER BEEN FLUSHED. EMPLOYEES RECEIVED CHEMICAL BURNS TO FACE AND NECK AND TORSO AS A RESULT OF THE INCIDENT.PLANT CONFIRMS SOME LINES WEREN'T FLUSHED.