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City of San Leandro 2023-2031 Housing Element Update 3-48 to create such capacity has been secured. If there is a lack of capacity, this could decrease the financial feasibility of a housing development. City of San Leandro System Wastewater is delivered to the plant via a collection system comprised of 13 sewage lift stations and 130 miles of sanitary sewers ranging in diameter from 4 to 33 inches. It treats about 5 million gallons per day, with peak flows up to 23 million gallons per day during wet weather flow. Maximum dry weather flow is 7.6 million gallons per day. The oldest sewers are located in the northeastern portion of the city from the Oakland city limits to Castro Street roughly between the Southern Pacific Railroad and MacArthur Boulevard. This portion includes the downtown area and the oldest residential areas of the city. Development in these areas would likely require sewer line improvements.44 The City regularly replaces aging components of its wastewater collection and transmission system. The City capital improvement program (CIP) process includes a system for evaluating the City’s collection system. The CIP process requires continuing improvements including collection system capacity upgrades, correcting structural problems, and modifications to pump/lift stations and the treatment plant. A major rehabilitation of the plant was initiated in 2011. Replacement of many components has taken place to meet health and environmental goals, avoid future costly emergency repairs, improve operations, and add redundancy to improve safety and reliability. The City has also worked to improve the sewage collection system by replacing aging pipes, which expanded operational options and improved efficiency and reliability and capacity. The City is currently designing a multi- benefit treatment wetland to treat 10-20 percent of the City’s treated effluent, projected to begin development in 2022.45 Oro Loma Sanitary District The Oro Loma Sanitary District provides wastewater collection and treatment services for a 13- square-mile service area. Approximately 20 percent of the Oro Loma Sanitary District’s customers are located within the City. The Oro Loma Sanitary District/Castro Valley Sanitary District Water Pollution Control Plant, just south of the San Leandro city limits, is jointly owned by the Oro Loma and Castro Valley Sanitary Districts. It has an average dry weather flow of 12.2 million gallons per day, with a design flow of 20 million gallons per day. Wet weather flows may occasionally exceed design capacity due to infiltration and inflow along the collection system. In the past 20 years, there have been no stoppages or overflows caused by system deterioration or pipe collapse on the gravity system. The district’s Pipeline Program is aligned to adapt to climate change, which estimates lower overall precipitation but more intense periods of rainfall. Developers are required to hire independent engineers to conduct hydraulic capacity studies for residential developments of 10 units or more. This requirement adds cost to housing development but is necessary to ensure wastewater system capacity.46 44 City of San Leandro. 2016. San Leandro Environmental Hazards Element https://www.sanleandro.org/civicax/filebank/blobdload.aspx?blobid=26256 45 City of San Leandro. 2021. https://www.sanleandro.org/depts/pw/wpcp/projects/treatment_wetland.asp 46 Oro Loma Sanitary District. 2019. Sewer System Management Program. https://oroloma.org/wp-content/uploads/SSMP-Final-.pdf