The main purpose of this legislation is to empower the Secretary of the Army to manage water development projects that deal with contaminated sediments. This is done through a collaborative remediation plan that involves both federal and non-federal parties, and it must be approved by the Environmental Protection Agency (EPA). The goal is to ensure that these projects effectively protect human health and the environment. Key provisions of the legislation include the establishment of a joint remediation plan that outlines the necessary actions to address contaminated sediments.