All money derived from the sale of bonds pursuant to section 650.408 except such portion as is required to be reserved pursuant to subsections 7 and 8 of section 650.408, all money collected on any tax authorized according to section 650.399 and all interest that may accrue on moneys so derived while deposited with any county depositary and not required to be used in paying such bonds or interest thereon, shall be used, and warrants drawn on the treasurer therefor, to pay:

(1) The cost and expenses incurred by the county maintaining any real or personal property used in the operation of the emergency communications system; and

(2) Such working, administrative and incidental expenses, not otherwise provided by law, as may be incurred in operating such emergency communications system.