1. American Society of Civil Engineers, 1994. Existing Sewer Evaluation and Rehabilitation, ASCE, New York, NY
2. Bellows, P., 2000. Vice President, Brown and Caldwell, Pleasant Hill, CA, Interview
3. E.P.A., 1999. Handbook: Sewer System Infrastructure Analysis and Rehabilitation. United States Environmental Protection Agency, Office of Research and Development, Center for Environmental Research Information, Cincinnati, Ohio
4. Hunaidi, O., Giamou, P., 1998. Ground-Penetrating Radar for Detection of Leaks in Buried Plastic Water Distribution Pipes. Seventh International Conference on Ground-Penetrating Radar, Lawrence, Kansas, USA, May 27–30, 1998
5. Isaac, B.R., 2000. Senior Facilities Inspector, King County Department of Natural Resources, Seattle, WA, Personal Interviews