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City of San Leandro 880 Doolittle Drive Industrial Project 2-14 Sanitary sewer service for the project would be provided by the City’s Sewer Department. Similar to the water line, a new sanitary sewer line would connect the proposed warehouse and an existing sanitary sewer main through the driveway on Doolittle Drive, as shown on Figure 2-7. Stormwater runoff would be treated on site to meet the current Alameda County C.3 stormwater regulations before being discharged to the existing storm drain system. On-site treatment would occur with a series of bioswales, as shown on Figure 2-7. The bioswales are designed to capture and slow/pool runoff from impervious surfaces, functioning as bioretention areas. The bioswales would include approximately 18 inches of biotreatment soils and an underlying approximately 12 inches of permeable gravels. The bioswales will be vegetated with a native bioretention grass. Runoff collects and infiltrates the biotreatment soil, reducing the volume of runoff discharged into the storm drain system. Slowing the velocity of runoff by directing it into bioswales also allows solids to settle out before the runoff is discharged into the storm drain system. After entering on-site bioswales, treated runoff that infiltrates the soil would enter storm drain inlets installed in each bioswale. As shown on Figure 2-7, the inlets would connect to a storm drain pipeline installed beneath new surface parking areas and connect to an existing storm drain through the Doolittle Drive driveway. Electricity and natural gas service at the project site would be provided by Pacific Gas & Electric, which provides services to the project area. 2.5.6 Construction and Grading The timing of project construction would be determined by market forces and other considerations, such as weather or availability of workforce. However, for purposes of this analysis it is anticipated that construction would begin in 2024 with demolition of existing vacant structures and related infrastructure, such as utilities and surface parking. Site grading would occur following demolition of the existing development on the project site, which totals approximately 212,000 square feet of structures. The site is relatively level, which minimizes the amount of grading included in the proposed project. Generally, grading would be designed to slope in a west-southwest direction across the site, which would allow stormwater runoff to flow into bioswale areas and then continue into the City’s storm drain system using gravity rather than mechanical forces. Elevations on the project site following grading would vary between approximately 10 feet and 17 feet above mean sea level. Preliminary grading design shows a balanced site The conceptual grading plan for the proposed project is shown on Figure 2-8. Project construction would commence following grading. Construction would include excavation and trenching to install buried utility connections, such as new water, sanitary sewer, and storm drain laterals. The foundation of the warehouse would be poured followed by framing and construction of the walls, interior spaces, and exterior. Paving of surface parking areas, driveways, and internal access roads would also occur during project construction, as well as construction of new sidewalk on site frontage along Hester Street. Additionally, repaving of a small off-site area between the existing off-site railroad tracks and the project site would be conducted. Following construction, new landscaping would be planted or installed. Assuming construction of the project is continuous, construction would occur over approximately 18 months, with 6 of those months being a period of inactivity following demolition that is associated with construction contracting. Construction staging would occur on-site. A variety of typical construction equipment would be used, such as backhoes, dump trucks, excavators, pavers, and dozers. A crawler crane with a boom height of up to approximately 161 feet would also be required. During construction, up to five existing trees just off the project site at the terminus of Hester Street would be removed.