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combined sheets and will be prepared to scale at 1-inch equals 20-feet to show major construction features and alignment data superimposed on a screened background of existing topography and utilities. The construction features shown on these plans will become the base for the other disciplines, such as storm drainage, composite utility, stage construction, pavement delineation, lighting and signals. Demolition of curbs, gutters, and asphalt pavement will also be shown. The profile portion will be shown on the lower half of the combined sheet, and will show the existing ground line and proposed centerline grade, and existing underground utilities at the centerline. The profiles will be prepared at 1-inch equals 20-feet horizontal and f- inch equals 2-feet vertical. 8. Drainage Plans and Profiles Contractor will prepare improvement plans for new storm drainage facilities for the widened Marina Boulevard. The drawings will be in a plan and profile sheet format providing information on size, material, locations, and length of storm drain mains and laterals. Known existing utilities will be included as reference to the plans. The sizing of all the storm drain mains and laterals will be in accordance with City of San Leandro standards and design parameters for the project. Drainage profiles will be prepared showing the entire length of each drainage system. The existing ground line above each system will be shown so that the excavation and hackfill can be determined. Each drainage profile shall contain information describing the construction features and elevations for each drainage system. The drainage systems will be identified by drainage system numbering consistent with the drainage plan. Hydrology/Hydraulics Report A memorandum will be prepared summarizing the recommended drainage modifications for the project. The memorandum will identify the drainage improvements within the right-of-way lines for Marina Boulevard between Alvarado Street and San Leandro Boulevard. The full memorandum will be submitted to the City and Alameda County Flood Control District (ACFCD) for review and comment. Drainage calculations prepared as a part of the hydrology/hydraulics study will be included as an appendix. Assumptions: • No new storm drain design or facilities will be required outside of the right-of-way limits for this project. • City of San Leandro and ACFCD's drainage criteria will be used in calculating runoff and pipe sizes. The Rational Method will be used to calculate run-off using with proposed criteria. Calculations such as unit hydrographs will not be performed. • Notice of Intent (NOI) and Storm Water Pollution Prevention Plans (SWPPP) will be prepared by the construction Contractor. Specifications will be prepared identifying the Contractor's responsibilities. • No Discharge of Storm Water Permit is required. • Outfall locations and storm drain tie-ins, including capacities, will be provided by the City within a 1S0-foot strip along the realigned roadway centerline. • No coordination or permitting effort will be required with the Regional Water Quality Control Board Exhibit A Page 9 of 13 STIP Marina Widening