Replace approximately 2,000 linear feet of 24, 30, and 36-inch diameter storm sewer pipe with approximately 650- feet of 66-inch diameter steel storm sewer mainline using pipe ramming and open cut methods, pipe abandonment, and structure abandonment. Construct a concrete outfall structure at the Columbia River and a concrete headwall structure at inlet of 66-inch diameter storm mainline. Install approximately 125 linear feet of new 12-inch diameter storm sewer main line, 50 linear feet of new 24-inch diameter storm sewer main line, 44 linear feet of new 6-inch diameter sanitary sewer main line, connections to existing structures, furnish and install approximately two 96-inch storm manholes. Excavate approximately 50 CY of rock and restore ravine vegetation with native trees and shrubs.
