A new complex of condominiums on a hill in Daly City, Calif., would increase sewage flows and overwhelm the 800-foot-long, 8-inch vitreous clay trunk line.Tom Piccolotti, city water and wastewater manager, asked John Rafferty, field director for TRIC Tools Inc., to burst and upsize the sewer by four inches. During the walk around, Rafferty saw utility-locating marks everywhere and the hill’s severe grade.“It made no sense to burst the entire line with its numerous service connections and adjacent utilities,” he says. “Only 160 feet at the flat foot of the hill was a candidate because the sewer crossed beneath a
