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r F = Storm frequency C = Weighted average runoff coefficient This project is relying on a storm sewer system carrying the runoff to the existing 30" outfall pipe. Miami -Dade County requires a 150% retention volume before discharging to the Bay area. The drainage system will be capable of providing 150% of the volume required for water quality. The drainage area within the right of way, from sidewalk to sidewalk, is 1.28 acres. The table below presumes the 150% required retention: The proposed outfall line will provide about 9,900 CF, which is greater than the 9,821.2 CF required. Schedule of Design Services: In addition to the drainage design services outlined above, the following services are anticipated as part of this j contract: Roadway Improvements: Installation of the proposed drainage system will require trenching in the northernmost westbound travel lane of NE 174th Street. The new pavement section to be placed after trenching activities will be designed to meet current standards. There are existing roadway feature deficiencies that will be corrected as part of this project. The existing roadway surface has extensive cracking and will require overlay. There are segments of valley gutter and curb and gutter that are cracked or subsided and will require replacement. Damaged sidewalk exists in several locations and a 50' segment of sidewalk on the north side of the roadway is marked with etchings; these areas will be replaced with new sidewalk. Survey: A topographic survey will be conducted near the onset of the project in order to create the DTM from which the design will be based. Our survey crews are experienced working in the City of Sunny Isles Beach and have completed boundary surveys and legal descriptions for similar outfall projects in the vicinity. Early gathering of survey data will ensure that the project schedule advances efficiently. (j Utility Coordination: Call Sunshine design ticket No. 334101781 reveals a number of utilities within the project area. Utility owners within the project area include: Miami -Dade County Public Works (Water and Sewer), Florida Power & Light, Atlantic Communications, Hotwire Communications, City of North Miami Beach, TECO Peoples Gas, and AT &T. Early contact will be made with utility owners and all available utility as -built plans will be collected. Coordination will be on -going throughout the project duration. Subsurface Utility Engineering (SUE): Miller Legg will conduct subsurface utility engineering activities so that actual utility conditions in the field are identified. The design team will identify critical utility locations for pipe depths and coordinates that are crucial for avoiding potential conflicts. Miller Legg's field crews will obtain "pothole" information to provide existing utility data. Signing and Striping: New signing and striping will be designed in accordance with the latest FDOT, Miami Dade County and MUTCD design standards. Consideration will be made for the existing bus stops, bus pullout and accompanying signage. Maintenance of Traffic: BHA will develop a traffic control plan that carefully addresses any impact from the proposed construction to the adjacent property owners, residents and the traveling public. Maintaining continuous access to the condominium towers located within the project limits will be a top priority when designing the drainage improvements and maintenance of traffic. Providing a safe work zone and a safe environment for pedestrians will be of the utmost importance. Landscape Architecture: Miller Legg has provided numerous South Florida municipalities with Landscape Architecture services for site and master planning, grant applications, streetscape design, greenway and trail design, irrigation design, management plan development, environmental and tree permitting, construction services, code review and development, and plan review services. Our design goal is to maintain existing landscape features to the extent possible. We will implement design of any additional landscape features that the City may request. BHA Request for Oualifications " City of Sunny Isles Beach RFO 11 -11 -02 Beiswenger Hoch b A,< cu es Civil Engineering Services To Design Street and Drainage Improvements