929.07 DETERMINATION OF COSTS.

   The determination of the estimated cost of any proposed extension of a sewer or sewers shall include all items of materials and labor, including any extraordinary costs occasioned by the opening of pavements, or street surfacing, rock digging, and frost, together with allowances thereon for engineering and general office expense pertaining to the purchase, storage, delivery and installation of all materials and equipment necessary to construct an extension; except that the costs so determined will not include charges occasioned by a sewer larger than would be necessary to meet the customer's estimated normal requirements, but in no case will computations of costs be based on a sewer of less than six inches inside diameter.

(1979 Code 51.07)