EE WAS WORKING WITH TWO OTHER EMPLOYEES TO TROUBLE SHOOT & REPAIR A 2"" SUBMERSIBLE PUMP AT THE BOTTOM OF THE ""EVENT"" SOLUTION POND. HE WALKED THE HDPE LINED SLOPE OF THE POND (3-1 POND) A COUP LE OF TIMES WHILE TROUBLE SHOOTING THE PUMP. WHEN FINISHED HE REPORTED A ""TINGLING"" SENSATION IN HIS LEFT HEEL. STRAINED ACHILLES TENDON.