2021-2024 Leak Detection Services

1. Work in safe and orderly manner 2. All field staff will wear observable identification badge while in the field. 3. Use all the equipment listed in the Equipment Used, section 4. Initially listen to all fire hydrants, all accessible main line valves, and when necessary, selected service connections in the entire distribution system by making physical contact with the valve, hydrant, pipe, or B-box. (Listening points that are not accessible will be given to the Utility and when corrected they will be listened to.) 5. Listening points of contact will be valves, hydrants, service valves or meter settings. The preference of listening points in order as follows; direct contact with the pipe, main line valves, hydrant valves, hydrants, then service valves or meter settings. 6. Specific listening distances will be determined by pipe material. Metallic type pipes; no greater than 500’ between listening points. Non-Metallic AC/Concrete type pipes; no greater than 300’ between listening points. Non-Metallic PVC/HDPE type pipes; no greater than 150’ between listening points. 7. A “suspected leak” log shall be maintained indicating all areas where suspected leak noise was heard. 8. When leak noise has been detected and or suspected, the will verify the suspected area a second time to confirm the noise. At least four hours will pass between the initial listening of the area before a second listen and confirmation is attempted. 9. Contractor/ will line locate the water main and service lines in the immediate area so the correct pipe distances can be input into the leak correlator and also so that the Water Utility will have an idea of where the water main is located prior to excavation. 10. The leak location will be marked in the field (on the surface) using environmentally formulated Precautionary Blue paint. 11. Contractor will use “State of the Art” Electronic Leak Correlators to determine if a leak is present and use the same equipment to pinpoint the leak. 12. Contractor will document all leak locations with a diagram indicating the location of the leak. Other information related to that correlation will be included as part of the field sheet such as the filters used for the correlation, line locations, distances between sensors, etc

Division 33 -

Utilities, Instrumentation and Control for Utilities, Water Utilities, Water Utility Distribution Piping, Water Utility Distribution Equipment, Disinfecting of Water Utility Distribution, Water Utility Storage Tanks.