Regulations Respecting the Employment of Persons for One or More Specified Periods of Less Than Three Months Totalling Less Than Six Months in the Aggregate During any Consecutive 12-Month Period in the Department of Forestry in the Clerical and Regulatory Group and the Secretarial, Stenographic, Typing Group of the Administrative Support Category, in the Engineering and Scientific Support Group and the Social Science Support Group of the Technical Category, in the Heating, Power and Stationary Plant Operation Group, in the General Labour and Trades Group and the General Services Group of the Operational Category During the Period Beginning on March 1, 1993 and Ending on December 31, 1993