In addition to the aforesaid entry fees, in the event the City supplies any labor, material, or equipment for making a connection to the water system, the property owner or his agent shall pay the following charges to the Utilities Department within days after receipt of the bill for the charges:
(a) Labor at City cost plus 25%;
(b) Material at City cost plus 15%;
(c) City equipment as determined by the Director of Public Works;
(d) Rental equipment at City cost, including operator, if any, plus 15%.
(1993 Code 53.16)