The purchasing agent at his or her option, is authorized to establish a purchasing revolving account. The purchasing fund shall be in an amount fixed by the city council from time to time by resolution and shall initially be five hundred dollars. All purchases for the central stores shall be charged to and paid from the fund, and all requisitions from departments drawn on central stores shall be charged to the appropriate budgets of the department using the specified supplies. The purchasing revolving fund shall be replenished to that amount by transfers from the budgets of such departments. (Ord. 429 §1 (Exh. 1), 1999).