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City of San Leandro <br />Sewer System Management Plan <br />Volume I <br />P a g e | 17 <br />observations from CCTV inspections, root cutting is performed with chain flail attachments on <br />the jetters or with mechanical cutters. <br />Rehabilitation and Replacement Plan <br />The City has taken a proactive approach in inspecting and evaluating the condition of the <br />collection system and supporting facilities. Routine weekly inspections are conducted on all <br />sewer lift stations for safety hazards and condition assessment. The City has an ongoing CCTV <br />inspection program to identify issues in the tributary collection system areas and to provide cause <br />analysis after SSO events. The City maintains an electronic database of scheduled cleaning work <br />orders and past history for all sewer mains under the City’s sanitary authority. <br />CCTV Inspections <br />The City maintains a comprehensive television inspection program. Sewer segments undergo <br />detailed video inspection for both structural and condition damage. The program provides for <br />televising the entire collection system every seven years. Critical defects are identified for spot <br />repairs and deteriorated reaches for potential rehabilitation or replacement. A future cleaning <br />frequency can be determined for each pipe reach based on the results of the inspections. In the <br />future, some pipe reaches may need inspecting every 10 years. <br />Each CCTV video is viewed by a lead Collections System Maintenance Worker, and the pipe is <br />graded per standards outlined in the NASSCO Pipeline Assessment Certification Program <br />(PACP). Using the PACP Code Matrix, each PACP defect code is assigned a condition grade <br />from 1 to 5. Grades are assigned based on potential for further deterioration or pipe failure. Pipe <br />failure is defined as when the pipe can no longer convey the pipe design capacity. <br />Grades are assigned for two categories: Structural and O&M defects. Grades are as follows: <br />5 – Immediate Attention Defects requiring immediate attention <br />4 – Poor Severe defects that will become Grade 5 defects within the fore- <br />seeable future <br />3 – Fair Moderate defects that will continue to deteriorate <br />2 – Good Defects that have not begun to deteriorate <br />1 – Excellent Minor defects <br />The mechanisms and rates of pipeline deterioration are highly dependent on local conditions. <br />However the following general guidelines are provided to estimate the amount of time before the