This long-term program is designed to assist the California Coastal Commission (CCC) in their efforts to ensure that the adverse effects to the marine environment caused by the sea water cooling system of the San Onofre Nuclear Generating Station (SONGS) are fully mitigated. Mitigation is in the form of: (1) the restoration of 150 acres of tidal wetlands in Del Mar, CA as out-of-kind mitigation to compensate for losses of nearshore fishes caused by the seawater intakes, and (2) the construction of a 373-acre artificial reef off the coast of San Clemente, CA as in-kind mitigation to compensate for the loss of kelp forest habitat caused by the seawater outfall. UCSB scientists work with the CCC and the owners of SONGS to design, monitor and evaluate the performance of the mitigation projects, determine the causes for any failures to meet the performance criteria, and recommend specific remedial actions aimed at ensuring the mitigation goals are met. Monitoring and evaluation of the two mitigation projects will continue until they meet the performance criteria for at least 32 years, which is the length of time that SONGS was operational and caused adverse impacts to the marine environment.