A 6-inch sanitary sewer and 4-inch production line drain at the Ghirardelli Chocolate Factory in San Leandro, Calif., were backing up. Plant engineer Paul Gibula called Ben Patterson, a consultant with TRIC Tools Inc. in Alameda, for help.Patterson found water standing under the cleanout grilles. A thick, opaque soup of cocoa butter mixed with debris from the floors packed the pipes, rendering his camera useless. Patterson taped a Rycom sonde from South Coast Equipment to his 1/4-inch duct rodder from Condux International to locate the two lines.Since repairs had to be done without interrupting production, Patterson recommended pipe bursting to
