EMPLOYEE WAS WORKING AT THE #1 PORTAL USING THE 1 1/2"" WASH DOWN WATER HOSE TO CLEAN OUT A DRAIN. ONCE THE DRAIN WAS CLEARED EE BEGAN PUTTING THE HOSE OVER HIS SHOULDER. AS HE PULLED THE HOSE THROUGH THE MUD, HE FELT PAIN IN HIS CHEST AND UPPER STOMACH. HE CEASED WORK IMMEDIATELY.