(a) Application for taps must be made 24 hours in advance of the time that such tap is required. The time that the excavation will be ready must be stated in the tap application.

(b) Taps in water mains within the city limits will be made at the real cost determined by the director. Taps in water mains outside the city limits will be made at twice the inside-city real cost determined by the director. At least once each year the director shall advise the water board as to the real cost of making various sizes of taps.

(c) All excavations made for the insertion of corporation stops in the water main must be large enough to permit proper operation of the tapping machine. The required size shall be determined by the director under whose direction the tap will be made.

(d) Upon request, the director shall furnish an estimate of the real cost of making a connection two inches in diameter or above to any of its mains. Such estimate shall include only those real costs which would be incurred by the water board.