My original plan for riding up the Quimby route would be to still start at the school on Kirk Ave with the entire group at 10:30am. Only head back down Alum Rock to South White Road and take that down to Quimby and head back east. It all depends on what tempo everyone is riding to see about rejoining Pete's group at the entrance to Joseph Grant Park where the lone water spigot and restrooms are.
Steve E. - The route I normally take when riding there is Homestead all the way to the end at Lafayette. Left at Market, The Alameda or Park Ave (The Alameda has freeway ramps) and left at Heading. Heading all the way east over the freeway which then becomes Berryessa. Past the Flea Market then right on Capital ave which eventually becomes Expressway. Pass the small airport and Eastridge mall and left on Quimby. Some of the neighborhoods and road conditions are not the greatest but not downright awful either. Perhaps others that live in or know the area can offer a better route.