Res 1996-129 - Laserfiche WebLink

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6zI( 1. Flow isolation shall consist of isolating -a designated reach of sewer during the early morning hours (midnight to 6:00 a.m.) by measuring in the sewer as necessary to determine infiltration rates. 2. Where practical, weirs shall be installed to measure the flows. Where a weir is not practical, the flow shall be measured by dipstick and velocity measurements. 3. For each location where flow isolation is performed, a flow isolation report shall ,-, be completed. F. Dyed Water Flooding Dye testing will be performed on questionable or suspected infiltration/inflow or exfiltration sources in order that positive identification and quantifications can be made. The test results will be documented and photographed or videotaped. Both public and private sector dye water tests may be necessary. Prior notification and approval by residents will be required. The dye used during this test will be environmentally safe, biodegradable, and pose no hazard to receiving streams. G. Cleaning and Internal Television Inspection . Prior to any televising and cleaning activities ADS will review the City's existing TV tapes and maintenance records. All pertinent information will be utilized where possible and included in the final report. ADS will provide internal color T.V. inspection to be conducted on sewer mains specified and approved by the CITY. A closed circuit color inspection camera will be used. Sewer lines will be cleaned prior to video inspection. Three passes will be made with the jet rodder prior to cctv. Videotapes of the entire line along with written inspection logs will be provided. Videotapes will include a voice narrative of observations and show the footage counter of the camera position from the reference manhole. The television inspection log shall be a comprehensive record and will clearly describe the location of each defect in relation to an adjacent manhole. Other points of significance such as locations of service line taps, unusual condition, roots, storm sewer connections, broken pipe, presence of corrosion, observed infiltration/inflow and other discernible features will be noted. Information on line size, depth, type of pipe, etc. will be included on the log. Should the camera not be able to pass due to an obstruction (i.e., protruding services, dropped joint, etc.) then ADS will attempt to enter from the opposite manhole (reverse setup) and attempt to T. V. the line up to the original obstruction. Payment will be made for manhole to manhole footage. G :\DALLAS\CO NTRA CT\SANMAR C .DOC June 25, 1996