CSA RRM Memorial Park CSA 07122022

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Consulting Services Agreement between City of San Leandro and RRM Design for Memorial Park Improvements Exhibit A – Page 7 of 11 Grading, Drainage and Stormwater Plans The plans will show all vertical control of the project elements, contour grading, spot elevations, and cut and fill estimates within the project site. The plans will detail all drainage facilities within the site. This scope is limited to the project site only (approximately three acres) and assumes that the existing off-site upstream and downstream storm drain infrastructure has adequate capacity for the proposed site development, and analysis or upgrades to this infrastructure is not included. Stormwater evaluation to include the following: This project is assumed to create and/or replace between 10,000 square feet and 43,559 square feet (0.99 acre) of impervious surface and is a C.3 Regulated Project. CONSULTANT will design permanent stormwater treatment in accordance with the C.3 Stormwater Technical Guidance (C.3 Guide, February 2021). The design will utilize a combination of low impact development (e.g., interceptor tree credits, self-retaining areas, self-treating areas) and stormwater treatment measures (e.g., bioretention, pervious pavements). CONSULTANT will prepare a City of San Leandro Stormwater Requirements Checklist and C.3 sizing calculations CONSULTANT will perform ten-year storm drainage analyses (hydrology and hydraulic) for the project drainage and stormwater designs. The C.3 calculations and exhibits, storm drain hydrologic/hydraulic calculations and exhibits, reference documentation, and project narrative will be provided in a comprehensive drainage and stormwater control plan CONSULTANT will submit a draft version of the drainage and stormwater control plan and the City of San Leandro Stormwater Requirements Checklist with the 90% PS&E and the final version will be submitted with the 100% PS&E Stormwater Pollution Prevention Plan (SWPPP)_ A project SWPPP is required for this project (more than one acre of disturbed land). CONSULTANT will prepare plans for temporary erosion control facilities. Temporary facilities will be proposed for the protection of graded areas and drainage devices. Details and appropriate notes for construction best management practices (BMP) and guidelines for implementation are proposed to be in conformance with the State of California Water Resources Board requirements and the approved staff report, including sediment control recommendations. DocuSign Envelope ID: 73B64E61-9591-470B-9CFE-9E9CD49407D4