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Consulting Services Agreement between City of San Leandro and August 3, 2023 Schaaf and Wheeler for Storm Drain Master Plan Exhibit A – Page 1 of 3 EXHIBIT A SCOPE OF SERVICES Project Understanding The City of San Leandro seeks an SDMP document that provides a comprehensive analysis of their existing system and serves as a basis for improvement recommendations for overall flood protection while synchronizing with the City’s infrastructure management initiatives. Approach Our staff’s extensive experience in completing SDMPs around the Bay Area has helped us devise an effective approach to completing these projects on-time and within the proposed budget. Our focused and qualified team is well-equipped to provide streamlined analysis, comprehensible results, and an SDMP document that will meet the City’s goals and needs. Schaaf & Wheeler has created an adaptable approach to developing an SDMP document. Many factors can influence the development and prioritization of improvements throughout the process, including interaction with creeks, conflicts with other utilities, and feasibility of meeting certain design criteria. Our experience in completing SDMPs has given us the knowledge and flexibility necessary to work around such factors and communicate effectively to create a feasible SDMP strategy for the City. We believe the scope provided by the City clearly lays out what the City expects to gain from completion of the SDMP update. Aside from completing Draft and Final report documents, we will communicate openly with the City and provide other deliverables documenting progress in a timely manner, which will allow the City to offer feedback during the development of the SDMP. Task 1: Data Collection Compiling Information from Previous Studies There may be previous hydrologic and hydraulic (H&H) studies of the San Leandro watersheds. We will utilize readily available information in these previous documents as a basis for updated watershed delineation to verify GIS data. Data Collection and GIS Databases Research and collection of background data are prerequisite to forming an SDMP document. GIS databases will be compiled and reviewed using ArcGIS. The software will be continuously used to update GIS data throughout the development of the SDMP document. In surcharged storm drain conditions typical during a 10-year design event, flow capacity is largely determined by the limiting hydraulic gradients established by ground elevations. The City’s up-to-date storm drain GIS database will be primarily used to build the study. Using the topography data, we can rapidly verify City storm drain node (manhole, catch basin, etc.) elevations on a consistent datum and approximate elevations that may be missing from City pipe system databases. Land use and zoning data necessary for estimating hydrologic parameters will be collected from the 2011 USGS National Land Cover Database, existing City Planning Division Zoning data, or Alameda County land use GIS databases. Prior to use in developing the hydrologic models, the land use GIS database will be checked against recent aerial imagery to ensure that it is generally representative of existing conditions. Soils data, also necessary for estimating hydrologic parameters, will be retrieved from the Soil Survey Geographic Database (SSURGO). DocuSign Envelope ID: 8107D769-50CA-440D-916A-9BD656730E41