The tax collector may, in his discretion, issue separate bills for such sewer service charges and separate receipts for collection on account of such charges. The County shall be compensated for services rendered in connection with the levy, collection and enforcement of such charges for the District in an amount to be fixed by agreement between the Board of Supervisors and the Board of Directors of the District. The compensation shall not exceed one percent of all money collected. The compensation shall be paid into the County salary fund. (Ord. 4 §4.15, 1973)