25A - SEWER VIDEO INSPCETION SERVICES

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Work Plan meter readings indicating safe removal of manhole lids. Once the location is deemed safe, the manhole lid is removed. The operator enters necessary line identification information including, manhole number, line ID number, and pipe material & size into data base. The camera is then placed on the ground next to the open manhole. Using the camera view, the operator records the visual inspection ofthe rungs, the cone and shat}, in-coming and out going lines to assess condition. The operator lowers the camera into the channel to record and view the invert of the pipe. Once the invert view is recorded, the video equipmern is set-up for inspection of the line. The operator's voice is recorded reading the video overlay. The operator cornrols the / camera in the line to video aU views and is responsible for proper camera height and / lighting. Pipe defects such as, breaks, cracks, off-set joims, roots, grease, infiltration and ex-filtration are noted in audio and through data entry. Defects are archived as Jpeg files. Other observations such as service connections, break-in connections and protruding taps are also noted. This process is repeated f°r each line segment. Quality ControllData Conversion All recordings are stored on a removable, digital hard drive which consists of videos, / Jpegs and a Microsoft Access database for the inspected work and are delivered to the V Houston & Harris Quality Control Departrnent daily. Every line inspected is checked for quality, accuracy and confirms all contract requiremerns are met. Data inserted in the database is checked for accuracy, compared to the City's Map ands an Excel Spreadsheet, supplied by the City, which includes all line segments for the entire sewer system. During this process we check the wash logs. ensuring they match thq~ sewer lines inspected that particular day. Once all data is verified to be correct the QC // process begins. Our QC tech views each video in its entirety first checking for proper lighting and centering of the camera. The video must have a clear picture, free of any kind of distortion or interferences and the audio must be clear and concise. Every Iine must als~ begin with a view of the open manhole proceeding uninterrupted in the downstream direction with the insertion of the camera into the manhole. All sewer lines are inspected using NASSCO's standard coding system. During the QC process all Iines are checked for the proper logging of each defect. All defects must be accurately coded using the proper NASSCO code, o-clock position(s) .and footage. The inspection shat] include location of all laterals filtration and other conditions pertaining to the sewer line. If durin thenfiltration, ex, g QC process the 10 25A-12