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) ) ) ) ) ) ) ) REQUEST FOR QUALIFICATIONS RFQ No.: 11-11-02 CITY OF SUNNY ISLES BEACH CIVIL ENGINEERING TO DESIGN STREET AND DRAINAGE IMPROVEMENTS Based on the geological conditions, high ground water levels with tidal influences and the condition of the existing sub-strata, deep/gravity wells would provide an adequate solution with regards to storm water attenuation and water quality treatment. A subsequent soil exploration analysis is needed to determine the hydraulic conductivity of the in-situ soil. Typically, sufficient hydraulic conductivity rates should range between 35-65 gallons per minute. In general, it is recommended that I deep well is sufficient for storm water attenuation and water quality treatment for 1-2 acres of contributing area. However, this should be verified with calculations. It should be noted due the salinity difference between fresh water and salt water, there is a 1.5 feet head loss associated with the employment of gravity wells and which would subsequently affect the hydraulic grade-line. Based on data obtained from National Oceanic and Atmospheric Administration (NOAA), the Mean High Water tidal elevation is approximately 1.65 feet and this should be used as the basis for establishing the ground water elevation of the drainage design. However due to the 1.5 feet head loss, the seasonal ground water elevation is approximately 3.2 feet and should be used for any routing calculations After examining the provided documentation, the preliminary drainage design would situate inlets at low points and areas identified as localized flooding zones. This information would be obtained by examining the updated survey and the maintenance records of the City of Sunny Isles Beach Public Works Department with input from the various Homeowner Associations to determine the severity and location of ponding. Once identified, the inlets shall be spaced according to FDOT spread criteria. The placement of all new structures and pipes will be coordinated with our Minority Business Enterprise subconsultant F.R. Aleman & Associates (F.R. Aleman). F.R. Aleman will field locate all possible utility conflicts that are identified during the design process in order to ensure that the proposed improvements will be able to be constructed. This will be a key design measure in allowing the contractor to not be delayed during construction. The principal permitting authorities in charge of controlling the permit criterion are: Department of Environmental Resources Management (DERM), South Florida Water Management District (SFWMD) Florida Department of Environmental Protection (FDEP), and the United States Army Corps of Engineers (USACE). The local regulatory agency DERM has indicated that the proposed project will require a Class I permit for construction in the tidal waters of Miami-Dade County. SFWMD has concluded that the proposed project will require an Environmental Resource Permit (ERP) and must meet the District's water quality and quantity criteria specified in its Basis of Review for Environmental Resource Permit Applications. If it is deemed necessary to replace or retrofit any of the antiquated outfalls, an USACE permit is necessary. Gravity wells are Class V wells, which are governed by the FDEP Injection Well Program and coordination for any permits must meet their approval. The proposed storm-water improvements are conditionally subject to the following permits. 1. Class I permit DERM USACEj 2. ERP SFWMDj 3. Class V Well Permit 62-528.630 F.A.C. 4. Nation Wide Permit USACE C H Perez & Associates