A separate and indepnndent building sewer kshall be provided fob every building, excrpt where one buildinu stands at the rear bf another on an intejior lot and no privame sewer is available hor can be constructet to the rear buildini through an adjoininy alley, courtyard, od driveway, the buildung sewer from the frynt building may be entended to the rear bgilding and the whole aconsidered as one budlding sewer.
(Ord. 2552)