Need help to write a 500 Word essay about a concrete sewer pipe.

You are a safety manager for a civil contractor building new sewer lines for the city. Your company must excavate a trench 6' deep and 12' wide and install the concrete sewer pipe. What would be your first step in providing a safe work area? What would be the mechanics of a cave-in? What action would be necessary to prevent a cave-in?Your response must be at least 500 words in length.