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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 , , ) ) Geotechnical Engineering The basis for any proposed stormwater management design is subject to the substrata of the in- situ soil conditions. Any subsequent drainage design would be limited by these conditions. There are several key components in establishing an effective stormwater management system and the substrata conditions will have a significant role in determining the methodology used in designing an efficient hydrologic and hydraulic stormwater management system. These factors include exfiltration and infiltration rates, soil permeability, and elevated groundwater table. The culmination of these factors will limit the type of stormwater management facility necessary to provide adequate flood and pollution control. There are a variety of methods used in obtaining substrata conditions. Our sub-consultant, Jaffer Well Drilling, Inc., is well versed in the latest methods to accurately determine ambient soil conditions Drainaee & Permittine The initial process in developing a viable stormwater master plan is to initialize a topographic survey to verify pertinent elevations of the existing storm water management system. This work will include field reconnaissance and coordination with the City of Sunny Isles Beach. If necessary, the information gathered can be stored and implemented into a Geographic Information System (GIS). Our GIS specialist can assist verifying existing stormwater system infrastructure data, thereby creating a reliable benchmark inventory. Moreover, our subconsultant, Video Industrial Services, Inc., will also examine the existing conditions of stormwater facilities to determine the degradation of the existing storm sewer lines and discharge structures. This will identify potential flood hazards due to sedimentation of fines in sewer pipes and antiquated outfalls. The drainage design for the project will consist of the following major components: roadway surface and bridge hydraulics, storm water runoff conveyance, and attenuation and treatment. The hydro graph generated by the roadway typical section is the most critical element with regards to storm water attenuation and treatment. This is due to geometric constraints and water quality compliance. The Dumfounding Bay has been designated as an Outstanding Florida Waters and it is subject to austere criteria with respect to pollution abatement. Furthermore, the basis for any proposed stormwater management design is limited by tidal elevations and the substrata of the in-situ soil conditions. Any subsequent drainage design would be limited by these conditions. There are several key components in establishing an effective stormwater management system for the City of Sunny Isles Beach and the substrata conditions will have a significant role in determining the methodology used. These factors include exfiltration and infiltration rates, soil permeability, and elevated groundwater table. The geotechnical report within the proposed project location indicate that the exfiltration rates are generally in the magnitude of 10-5 cfs/sf-ft of head, which indicates low soil percolation and would not provide a viable solution in regards to stormwater attenuation and pollution abatement. C H Perez & Associates