Funding. Effective the first full pay period following ratification, $15.50 per calendar week per full time equivalent shall be paid to the Mass Public Employees Health and Welfare Fund. The amount of contributions for each year shall be based on the number of full-time equivalent employees as of the October payroll period during such fiscal year; or as of the last payroll period in the month of October for those on a weekly payroll. The contributions made by the Employer to the Health and Welfare Fund shall not be used for any purpose other than to provide health and welfare benefits and to pay the operating and administrative expenses of the fund. The contributions shall be made by the Employer in an aggregate sum within forty-five (45) days following the end of the calendar month during which contributions were collected.