On-Call Leak Detection Services

Leak Detection Surveys 1. Firm shall provide water distribution system leak detection survey services on an on-call basis to the City of Salem. The Contract is for a one-year term, and is renewable for a second and third year at the City’s sole discretion. Prices proposed are fixed for three years. 2. The number and size of such surveys to be ordered during the term of this Agreement is at the discretion of the City of Salem. The City anticipates that the total miles of survey ordered during the first year of the Agreement will likely be at least 100 miles. The City intends to focus initially on distribution mains in or adjacent to roadways. The City, however, reserves the right to order any number or length of surveys including transmission and cross-country mains, or none. 3. Firm shall furnish all equipment, labor, materials, and transportation to conduct the leak detection surveys. 4. Firm shall conduct the leak detection surveys with minimal disruption to traffic. Firm personnel shall comply with all traffic regulations, follow City safety procedures, and provide their own safety equipment and materials as needed. Where necessary due to traffic or noise issues, Firm shall perform leak detection at nigh and/or weekends to obtain satisfactory ambient conditions. 5. Firm shall coordinate the surveys with the City Engineer or designee and conduct the surveys with minimal disruption to the operation of the water system. Firm shall not operate any valves, hydrants or cub stops; only staff designated by the City Engineer shall operate water system facilities. Each time the City orders surveys, the City will provide electronic copies and hard copies of GIS maps of the water system showing mains, valves, and hydrants. The maps will indicate the extent of the survey being ordered, and the estimated miles. 6. Firm shall keep the Engineering Division and Police Department informed via email on a daily basis of the planned areas of work. 7. The City anticipates that the surveys may be conducted with acoustic listening equipment, followed by the use of noise correlators for leak pinpointing; or by use of correlating sensors as primary mthod. However, the City welcomes and will review proposals for other means and methods, either instead of or in addition to acoustic/correlator techniques. 8. For acoustic (sonic) leak surveys, Firm will follow MWRA 360 CMR 12.00 guidance. All accessible direct points of contact for the distribution system shall be sounded including hydrants, valves, and selected sidewalk/service valves. In paved areas, a ground microphone shall be used to listen over the pipeline at intervals not to exceed 10-feet. Acoustic detection shall be followed by a correlator survey to pinpoint the leak. For correlator-based surveys, correlators will be utilized as primary method of leak detection through deployment of (2 to 10) correlation sensors on all accessible direct points for the distribution system shall be sounded including hydrants, valves, and selected sidewalk/service valves. 9. Firm shall report service leaks to the City via email on a daily basis. When a leak on a service line is reported to the City, the City will close the curb stop before Firm has demobilized from Salem, to allow the firm to re-survey the location to determine which side of the curb stop or gate valve the leak is located. There will be no additional compensation for returning to the location for this purpose. 10. Firm shall mark out location of pinpointed leak with marking paint (pink or blue) 11. Firm shall coordinate with the City Engineer or designee to repeat acoustic or correlated leak detection following service box or valve closure to confirm suspected location where feasible. 12. For any leaks identified by the Firm and repaired by the City before Firm demobilized from Salem, Firm shall re-survey the areas repaired to confirm leak has been repaired with no additional compensation for the survey

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Plumbing, Common Work Results for Plumbing.