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City of San Leandro Sewer System Management Plan Volume I observations from CCTV inspections, root cutting is performed with chain flail attachments on the jetters or with mechanical cutters. Rehabilitation and Replacement Plan The City has taken a proactive approach in inspecting and evaluating the condition of the collection system and supporting facilities. Routine weekly inspections are conducted on all sewer lift stations for safety hazards and condition assessment. The City has an ongoing CCTV inspection program to identify issues in the tributary collection system areas and to provide cause analysis after SSO events. The City maintains an electronic database of scheduled cleaning work orders and past history for all sewer mains under the City's sanitary authority. CCTV Inspections The City maintains a comprehensive television inspection program. Sewer segments undergo detailed video inspection for both structural and condition damage. The program provides for televising the entire collection system every seven years. Critical defects are identified for spot repairs and deteriorated reaches for potential rehabilitation or replacement. A future cleaning frequency can be determined for each pipe reach based on the results of the inspections. In the future, some pipe reaches may need inspecting every 10 years. Each CCTV video is viewed by a lead Collections System Maintenance Worker, and the pipe is graded per standards outlined in the NASSCO Pipeline Assessment Certification Program (PACP). Using the PACP Code Matrix, each PACP defect code is assigned a condition grade from 1 to 5. Grades are assigned based on potential for further deterioration or pipe failure. Pipe failure is defined as when the pipe can no longer convey the pipe design capacity. Grades are assigned for two categories: Structural and O&M defects. Grades are as follows: 5 — Immediate Attention Defects requiring immediate attention 4 — Poor Severe defects that will become Grade 5 defects within the fore- seeable future 3 — Fair Moderate defects that will continue to deteriorate 2 — Good Defects that have not begun to deteriorate 1 — Excellent Minor defects The mechanisms and rates of pipeline deterioration are highly dependent on local conditions. However the following general guidelines are provided to estimate the amount of time before the Page 117