It’s hard enough maintaining an aging sewer system under the best of conditions. It’s harder still when the terrain is challenging and the earth itself regularly moves.Stege Sanitary District, in California’s San Francisco Bay area, must cope with a geologically active area over a part of the San Andreas Fault, source of several major earthquakes and frequent tremors. The terrain is also hilly, and access to lines for cleaning and inspection is not always easy.Still, the district has steadily reduced stoppages and overflows on its 150 miles of mains and has created a system that can withstand seismic punishment. In
