Special conditions in some Corps permits require compensatory mitigation in order to minimize impacts to waters of the U.S. Monitoring reports are the permittee's report to the Corps on the status of aquatic resource compensation projects: how they are progressing towards meeting their performance standards, problems encountered and how they were addressed, etc. They are generally required to be submitted annually for at least five years. At the end of the monitoring period an "assessment report" is submitted which provides lessons learned, the actual amount of compensation provided compared to what had been designed based on a wetland delineation, etc. The assessment reports are included with monitoring reports.