Plot: The final episode on the San Francisco project begins with a visit to the Marin County Civic Center, Frank Lloyd Wright's only government building. At the site, Richard joins our master carpenter to do a little gardening in the ten square feet of soil in front of the church, then Richard gets the rundown on homeowner Mark Dvorak's new front-loading washing machine, which saves 60% of the electricity and 40% of the water used by conventional top-loaders