55. (1) Every operator of a day nursery shall ensure that the children enrolled in each day nursery operated by the operator are placed in groups according to age as set out in Schedule 3 or 4, as the case may be, except where a Director approves otherwise in accordance with subsection (2).  R.R.O. 1990, Reg. 262, s. 55 (1). (2) A Director may approve the placement of children in one age group with children in another age group if, (a) the ratio of employees to children and the group size required for the younger age group are used for mixed age groups if more than 20 per cent of the children are from the younger age group; and (b) younger or older children are placed in not more than one group for each category as set out in Schedule 3 for each day nursery operated by the operator.  O. Reg. 50/91, s. 2. (3) The number of employees required for the care and guidance of the children enrolled in a day nursery when on the premises or during activities off the premises shall be determined by the operator of the day nursery in accordance with the ratios set out in Column 2 of Schedule 3 or 4, unless otherwise approved by a Director.  R.R.O. 1990, Reg. 262, s. 55 (3). (4) Every operator of an integrated day nursery or private-home day care agency shall employ one resource teacher to plan and direct the individual and small group training for every four handicapped children who are enrolled in the day nursery operated by the operator or location where private-home day care is provided by the operator and who are funded under the Act or under the Developmental Services Act, unless otherwise approved by a Director.  R.R.O. 1990, Reg. 262, s. 55 (4); O. Reg. 435/01, s. 5. (5) A resource teacher shall not be included when calculating the number of employees under subsection (3).  R.R.O. 1990, Reg. 262, s. 55 (5). (6) Despite subsection (1), except where the children enrolled are under eighteen months of age, during the periods of arrival and departure of children and during the rest period the ratio of employees to children may be reduced to less than that set out in Schedule 3 or 4, as the case may be, if the observed ratio is not less than two-thirds of the required ratio.  R.R.O. 1990, Reg. 262, s. 55 (6). (7) Where, (a) fewer than five full-time employees are required to meet the ratios as set out in Schedule 3 or 4, the supervisor may be counted as a full-time employee; (b) five or six full-time employees are required to meet the ratios as set out in Schedule 3 or 4, a full-time supervisor may be counted as a full-time employee for up to half the time a full-time employee is required to be on staff; and (c) seven or more full-time employees are required to meet the ratios as set out in Schedule 3 or 4, the supervisor shall not be counted as an employee.  R.R.O. 1990, Reg. 262, s. 55 (7). (8) Every operator of a day nursery shall ensure that where there are in attendance at a day nursery operated by the operator, (a) fewer than six children eighteen months of age or over, there is at least one adult in attendance; (b) six or more children eighteen months of age or over, there are at least two adults in attendance; (c) fewer than four children under eighteen months of age, there is at least one adult in attendance; and (d) four or more children under eighteen months of age, there are at least two adults in attendance.  R.R.O. 1990, Reg. 262, s. 55 (8).