25B - AGMT - CLOSED CIRCUIT TV INSPECTION OF SEWER

Home Browse Search

i) NASSCO rating scores including as a minimum: Quick Structural Rating (QSR), Quick Maintenance Rating (QMR), Structural Pipe Rating (SPR), Maintenance Pipe Rating (MPR) and Overall Pipe Rating (OPR). j) Observations, comments, recommendations, laterals referenced to footage counter and video clock (tape counter). IS. All digital reports for sewer manholes shall contain as a minimum the contained information on the Level I of the MACP by NASSCO guidelines and all items listed on item 14 listed above as applied to sewer manholes. 16. At all points within the sewer showing defects, laterals and sewer appurtenances, the Contractor shall stop the camera, rotate (up to 360 degrees) and/or tilt the camera lens to ensure adequate video coverage. All defects shall be rated/scored and logged in accordance with NASSCO guidelines. 17. Each database shall have runs numbered in sequential order starting with one (1). The operator shall proceed to the next run number whenever the camera is withdrawn regardless of the reason, encounters the next manhole, next cleanout or when a run is terminated. Digital video files (one for each run) shall conform to the indexing system with each file being designated by concatenating the database number with the run number (i.e.: 1179-0 LWMV would designate the first run on database number 1179). If such naming by the contractor is found to be technically unfeasible, the contractor shall deliver the files, along with any tabular information that would be necessary for the City to automate the file naming process. Any file naming convention that does not conform to the aforementioned requirements is subject to prior approval of the City. 18. Prior to the commencement of work, the contractor shall demonstrate to the City the procedures that shall be used for the inputting of City manhole numbers, run numbers, street names, or any other data that is encoded in the video database and how the quality and uniformity of that data will be guaranteed. 19. The camera shall be stopped and/or backed up to view and analyze conditions that appear unusual or uncommon to a sewer main in good condition. There shall be no loss of video quality at any time. 20. As the video is produced, the technician shall provide an audio narration of the inspection to include identification of the sewer main location, by street intersection location or street address as well as by City manhole number, inspection direction (upstream/downstream) and complete descriptions of the line conditions as they are encountered. The audio portion of the video recording shall be free from electrical interference, feedback, hum, and background noise. 21. If the camera cannot pass the entire sewer reach from its point of insertion, the reach shall be inspected from both directions. The inspection logs for the reach shall include an identification of the nature and location of the blockage. The contractor shall notify the City immediately of any such obstruction so that it may be repaired or mitigated by the City and/or the contractor so that work may proceed. 22. Video runs showing condensation or submersion of the lens, poor or out-of-focus images, poor audio, or otherwise poor image quality shall be cause for rejection and may necessitate re-inspecting at the contractor's expense if the City determines the video run is not of acceptable quality. 23. In special cases, when directed by the City, the contractor shall be responsible for plugging manhole outlets during CCTV inspection. The sewer lines will be in service at the time of inspection. 24. Television inspection of sewer mains with high volumes of flow (pipe running 1/3 full or more) will be done at night between the hours of 10 p.m. and 5 a.m. unless otherwise 12 25B-14