Wastewater System Capacity Improvements Basins 4 & 6

The project consists of construction of new sanitary sewer pipe or sanitary sewer pipe replacement in Basins 4 and 6 in St. Helens, Oregon. The lengths of new sewer pipe are 33 feet of 10-inch PVC, 3,098 feet of 12-inch PVC, 1,340 feet of 15-inch PVC, 1,822 feet of 18-inch PVC, 1,443 feet of 24-inch PVC, 2,629 feet of 27-inch PVC, and 2,084 feet of 28-inch HDPE Pipe. The 24-inch PVC pipe and 1,564 feet of the 28-inch HDPE sewer pipe will be completed using a trenchless method. This includes one boring under a railroad. Associated work includes rechanneling 18 existing manholes and installing 49 new manholes, 150 feet of water line relocation, 383 feet of storm pipe replacement, backfill and asphalt paving of trenches, sewer testing, and restoration of landscaping and structures within the sewer improvement area. Work includes new sewer pipe within Highway 30 right-of-way requiring coordination and inspection with Oregon Department of Transportation (ODOT).