This Manual of Practice provides detailed, accessible coverage of the assessment and repair of pipeline infrastructure. Its contents are relevant for a broad range of positions within the water quality industry, including municipal managers, contractors, consultants, consulting engineers, and municipal staff engineers. The information and techniques addressed here have become increasingly important as the enormous network of underground pipelines in the United States ages--educational materials and up-to-date information are critical as we are faced with the tasks of renewing and replacing that system.