If, after lay-offs have occurred and for a period of one calendar year after the 30th day of September following the date of lay-off, positions become available, teachers who have been laid off and have given written notice that they wish to be recalled shall be offered positions, providing such teachers have the necessary training, qualifications, ability and experience for the position(s) available. Seniority with the Division will be used to determine the order in which laid off teachers are offered the available positions provided that the said teachers have the necessary training, qualifications and experience.