Specifications include, but are not limited to: The consultant will occasionally be required to perform multi-beam, side-scan, magnetometer, and sub-bottom hydrographic surveys at specific sites around the state. The majority of the surveys will require the consultant to perform conventional single beam hydrographic surveying for our bridge scour program along designated bridges using standard survey methods and best surveying practices for data acquisition. The survey shall consist of running range lines at predetermined stations over the water and on the banks. The occurrence of each survey of each bridge will be determined by DOTD schedule and will commence within a time period of fifteen (15) days before or after the scheduled date. The survey will use predetermined horizontal points or positions along a range line. The consultant will use the latest DOTD hydrographic survey to recover or reestablish base lines and bench marks. The consultant will be responsible for using and maintaining existing base lines and ranges.