19F - RECEIVE AND FILE SEWER SYSTEM

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FOG Control Program Manual 2.4 Overview of FOG Control Program The FOG Control Program is based on the City's FOG Characterization Study activities and the requirements of the WDR. This program integrates various elements into the program to accomplish the goal of preventing SSOs. These key elements of the program are: sewer line maintenance activities associated with the FOG -related enhanced maintenance locations; a FOG Control Ordinance and inspection process to minimize the discharge of FOG from FSEs; an educational outreach program to minimize the discharge of FOG from multi -family housing and single family homes; and the Orange County Sanitation District's (OCSD) Waste Discharge Pretreatment and Source Control Program for discharge of FOG from industry. 3.0 SEWER LINE - ENHANCED MAINTENANCE LOCATION PREVENTATIVE MAINTENANCE 3.1 Overview of Sewage Collection System and Mapping The City's sewage collection system consists of a network of sewer mains, manholes, and lift stations, which conveys approximately 36 million gallons per day of sewage generated within the City's service area to the Orange County Sanitation District's (OCSD) trunk sewers for treatment at OCSD's Water Treatment Plants. The City's system consists of approximately 400 miles of collection system mainline piping ranging in size from 6 inches to 24 inches. The system includes 2 sewage lift stations, 8,200 manholes and approximately 45,000 individual service connections. The City is responsible for repairs to the sewer laterals from the public sewer main to the property line in the public right of way. Historically the collection system was documented with 186 hand -drawn, atlas sheets, which included property and right of way boundaries, sewer mains, manholes and service laterals. Subsequently, the City transferred all of the information contained in the hand -drawn sheets to a single CAD (computer aided design) based map, and then to a Geographic Information System (GIS) based mapping system that can be accessed by maintenance staff and FOG inspectors in the field to evaluate an FSEs proximity to an enhanced maintenance location or recent SSO or FOG blockage. 3.2 Routine Sewer Line Cleaning and CCTV The entire collection system is cleaned in accordance with the cycle established in the SSMP. The line cleaning operation is accomplished utilizing hydro -combination units, each operated by a crew of two trained operators. The general process consists of hydrojetting the sewer line and vacuuming excessive debris from downstream manholes. The program is typically performed in a progressive manner (i.e., the system is cleaned from manhole to manhole continuing on each successive day at the manhole following the manhole last completed on the previous day). If significant FOG is 19F-185 4