Under the general supervision of the Supervising Environmental Technician or other supervisory official in the Department of Environmental Protection, plans and supervises the work of subordinates in the performance of technical, semi-skilled and other field and office work in connection with a phase of environmental engineering, sanitation, or environmental investigations and inspections pertaining to water resources, Supervises staff and work activities; prepares and signs official performance evaluations for subordinate staff; does other related duties. Additional duties include knowing the concepts of and the legal requirements and procedures for collecting samples, specimens, proper storage, and transporting methods; using maps, charts, and navigational equipment, as well as meters and other testing devices; managing the purchasing and maintenance of assigned vessels, vehicles, and equipment; conducting investigations; and maintaining records.