5 – 9. Identification of additional Testing Designated Positions Procedures for requesting additional positions which commanders want to designate as a TDP are provided in DA Pam 600 – 85. 5 – 10. Testing Designated Positions within the US. Army Corps of Engineers The approved TDP positions specific to the US. Army Corps of Engineers areas follows a. Positions that require the incumbent to operate any surface vessel, whether powered or not, including dredging equipment, in which the duties include operating, navigating, steering, directing, or sailing the vessel, operating the engines of a vessel while underway, or operating the spuds) (anchors) on a dredge. b. Positions that require the incumbent to operate navigational locks for passage of marine surface traffic or that involve dispatching and clearing marine surface traffic in and out of narrow ship canals, to include marine traffic controllers. c. Positions that require the incumbent to operate flood control gates to control water levels on waterways, to include dam operators. d. Positions that require the incumbent to operate a water treatment plant to produce potable water for community and government use in which the duties include laboratory testing of water samples or the introduction of potentially hazardous chemicals and compounds into the water in the course of treatment. e. US Army Corps of Engineers activity must be prepared to coordinate to test for reasonable suspicion, to conduct followup testing, and test volunteers. (1) Designation of the activity DTC, by name, title series, grade/rank, and telephone number must be appointed. (2) A verified TDP list must contain the name, EDI – PI, gender, position title, series, pay plan (for example, GS) and supervisor. f. Ensure to all employees the availability of a certified employee assistance professional (CEAP) emphasizing employee education, counseling, and referral to rehabilitation/treatment services. g. Provide a safe harbor for any employee who voluntarily admits his or her drug use.