Why not install the Wildcat Pipeline (El Cerrito) and the Central Pressure Zone Pipeline (El Cerrito/Richmond) in a single pipeline or a single trench?

The Wildcat Pipeline (El Cerrito) and the Central Pressure Zone Pipeline (El Cerrito/Richmond) serve customers at different elevations, so the water in each pipe is at a different pressure and the two pipelines cannot be combined into a single pipeline. Regarding a single common trench, the two pipelines connect into existing transmission mains at different points, so placing the Wildcat Pipeline (El Cerrito) in San Pablo Avenue would require constructing a longer pipeline. Similarly attempting to place the Central Pressure Zone Pipeline (El Cerrito/Richmond) in Richmond Street would require constructing a longer pipeline.