There is a project upcoming for a 20' deep sanitary sewer main to be installed in an area known to be sandy and with a high ground water table. We think the water table could be 10 or 15' deep. There is about 1,000 feet of main to be installed. What kind of dewatering system should I anticipate needing in a worst case scenario? How will the dewatering process be executed as the pipe crew makes their way down the line?