Reso 2009-115 - Laserfiche WebLink

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City of San Leandro Sewer System Management Plan Volume I forwarded to the City's Engineering staff where they are prioritized and scheduled into the capital improvement program. Approximately 5% of the system is included in the focused cleaning program, with cleaning on a 30, 60, or 90-day schedule. Cleaning frequency depends on the history and cause of stoppages or overflows on a line. Focused cleaning is performed primarily by jetting. Root Control The City has both a focused and cyclic root treatment program that covers approximately one- third of the system per year. Roots encroach upon the interior of sewer mains through structural cracks faulty pipe joints and defective laterals. Root intrusion is also a common problem in sewer laterals which are shallow and frequently not as well constructed as sewer mains. Consequently, root intrusion occurs most often on private property. If roots are observed to be an issue during routine cleaning, in response to complaints, or through observations from CCTV inspections, root cutting is performed with chain flail attachments on the fetters or with mechanical cutters. Grease Removal and Control The City includes grease cleaning as part of its focused maintenance programs. The City is expanding its grease control program to include inspections of grease interceptors every 12 months in areas with high grease accumulations in sewers. Grease generally enters the sewer system as a liquid and solidifies when cooled. Grease accumulation on pipe walls and conveyance to the treatment plant is a potential cause of SSOs. The City also requires food processing establishments to adopt best management practices to minimize grease discharges to the collection system. The City routinely cleans known grease hot spots and is actively working to mitigate the source control through our FOG programs. Scheduled Inspections and Condition Assessment 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 of the sewer mains within the City. The City of San Leandro is currently in the process of establishing the criticality of sewer segments to prioritize and schedule that problem area for replacement or repair based on criteria set by the City's Engineering and Maintenance staff. The complete history of maintenance operations and performance is housed in the ICOM3 data warehouse. Keeping the history current requires only that current routine maintenance activities findings and performance be timely uploaded to the program. Page ~ ~.