e rate for overtime worked immediately preceding or immediately following those normal workdays, in which instance said employee shall receive shift differentials at two (2) times the normal shift differential as set forth in the first two paragraphs of this note. NOTE 3. REMOTE WORK LOCATION BONUS. Employees of the Power Operating and Maintenance Division in the classes Chief Electric Plant Operator, Code 5237, and Principal Clerk Power, Code 1211, whose permanent reporting location is the Castaic Power Plant, shall receive additional compensation of $10 per day for each day worked at that location. NOTE 4. CALL BACK When an employee is notified while off duty to report for work at a time which is outside of the employee’s normal work schedule, and the employee is released in less than two (2) hours (including time allowed for travel), the employee shall be credited with a minimum of two (2) hour of work. Employees who are compensated for overtime in accordance with Section 4.908 who are notified between 12 Midnight and 6:00 a.m. and directed to report immediately for work (other than for scheduled overtime) shall receive a minimum of two (2) hours at the double time rate. Additional calls received within the two-hour minimum period shall not establish an additional minimum period of double time. Hours worked after the two-hour minimum shall continue to be paid at the double-time rate until the start of the employee’s regularly scheduled hour. Should the two-hour minimum overlap into an employee’ regularly scheduled work hours, the straight-time pay for the regularly schedule hours shall commence after the close of the two- hour minimum period. NOTE 5. WATER MICROBIOLOGIST One person in the class of Water Microbiologist, Code 7857, assigned to DDR No. 52-78149, when regularly assigned to present testimony on water quality issues before Congressional and Legislative Committees and Regulatory Bodies; when serving as Department representative and liaison to National, State and local groups, task forces and inter-agency water quality committees; and when functioning as Department spokesperson to the news media, environmental groups and the public on water quality issues, shall receive salary at the fourth premium level rate above the appropriate step rate in the salary range prescribed for the class. NOTE 6. EXECUTIVE ASSISTANT TO GENERAL MANAGER DWP II.