AgdaPkt 2018-03-26 Joint SA PFA - Laserfiche WebLink

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City of Redwood City Page 33 Sewer System Management Plan, March 2018 Element IV The City’s sewer pipeline CCTV contractor inspects sewer manholes as part of the same inspection contract. The inspection contractor performs a visual inspection of the manhole structure and documents the manhole inspection using a Sewer Manhole Inspection Form included in Appendix IV-8. The annual results of CCTV inspections for the past eight fiscal years are contained in Table IV-3 below. Table IV-3 : Historical Results of Closed Circuit Television Calendar Year CCTV Performance linear feet CCTV Performance, Miles Percent of the System 2007/2008 32,800 6.21 4.20% 2008/2009 108,315 20.51 13.87% 2009/2010 65,902 12.48 8.44% 2010/2011 68,905 13.05 8.82% 2011/2012 65,336 12.37 8.37% 2012/2013 106,370 20.15 13.62% 2013/2014 104,618 19.81 13.40% 2014/2015 105,378 19.96 13.49% 2015/2016 123,383 23.37 15.8% Total 781,007 147.91 100.00 Average 86,778 16.44 100.00 The wastewater collection system staff maintains a list of known structural deficiencies determined from the PACP priority ranking system and the manhole inspection reports. This list is maintained in priority order from the field observations or repairs are made depending upon the nature of the deficiency. IV-8.2 Sewer Pipeline and Manhole Condition Assessment, Rehabilitation Planning, and Prioritization The City’s Community Development Department, Engineering and Transportation Division is responsible for performing sewer and manhole condition assessment and sewer rehabilitation planning. The City has developed an internal inspection data review process for performing sewer condition assessments. Inspection and video data are linked using the City’s geographical information system (GIS) to pipeline segments on the City map. The map color codes sewer pipeline defect locations. The reviewer can select a specific pipeline for review and view inspection and video data for selected segments. A City staff engineer will perform evaluation and video review of all pipeline segments within a sewer basin and will document the City’s decision to perform rehabilitation or replacement of pipeline segments within the meter basin. Once all of the pipeline segments within a sewer basin are evaluated, the City will develop sewer rehabilitation and replacement projects to address all segments selected for rehabilitation and replacement within a sewer basin. Rehabilitation and replacement projects generally follow the prioritization of sewer basins based on I/I factors listed and the PACP condition ratings. In some cases, the schedule for larger rehabilitation and replacement projects are shifted based on available funding. Rehabilitation and replacement of sewer manholes is performed separately from sewer pipeline rehabilitation and replacement. City staff perform a secondary inspection on all sewer manholes 6.2.A. - Page 41