This handbook provides guidance for inspection and maintenance of cathodic protection (CP) systems. It should be used by field personnel to perform scheduled inspections and preventive maintenance, and to troubleshoot and repair defects. Information on non-routine field measurements is also included to enable technical assistance personnel to troubleshoot problems beyond the capability of field personnel to isolate or correct. For Army facilities use Public Works Bulletin 420-49-29. Operation and Maintenance of Cathodic Protection Systems, 2 December 1999.