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'1 CIVIL ENGINEERING SERVICES TO DESIGN STREET AND DRAINAGE IMPROVEMIE, . ill BID NO. 11-11-02 rl , ] r I , 1 Highland Village Neighborhood Improvements North Miami Beach, Florida I . Highland Village is a residential mobile home park located in the City of North Miami Beach, Florida adjacent to the Biscayne Bay Aquatic Preserve with over six hundred low-income residents living in this community. The neighborhood was experiencing septic tank failures due to low site elevations and high groundwater levels resulting in human waste pollution of the adjacent wetlands. C3TS conducted preliminary environmental and hydrological studies, planning, and final design of wastewater and stormwater management systems. A multi-phase construction approach allows Federal funds to assist in funding the construction of wastewater collection and transmission system to replace septic tanks, and an area-wide stormwater management plan that includes overflows to wetlands and excess runoff pumping into surface aquifer wells. C3TS prepared a NEPA Environmental Information Document to substantiate the need and specify the use of these funds. The first phase of the stormwater management component includes the installation of 4,500 LF of drainage pipes, three stormwater treatment units for separation of solids, a below ground stormwater pump station using electrical submersible -verfiCafmiXed-ftow pumps' (2'}00 gpm capacity at 18-feet TDH, 30 HP, and abrasion resistant impeller) using 30-inch diameter tube, discharging to a 24-inch diameter x 200-foot deep well. Stormwater pretreatment consists of solids and sediments separation accomplished by a 6-foot diameter x 16-foot deep stormwater treatment structure that uses gravity, centrifugal force, and separation screens. Oil and grease are also separated hydraulically prior to entering the pump station. The pump station is controlled via adjustable floats, an automatic controller with stand-by generator connection capability, and telemetry, which is connected to the City's system. The City operates a stormwater utility, which is outfitted with portable electrical generators. The pump station can also be by-passed and portable pumps installed to pump directly into the open well pipe, which is connected to an overflow that limits the head of water that can be placed upon the well. The design allows for each pump station to be connected to up to 3 wells via a manifolded pipe, allowing each well to be valved off and to either work in parallel or independently from the others. Phase 1 construction, however, limited the work to a single pump station and a single drainage well. In addition to the new Pump Station and drainage well, four existing outfalls located at the east limits of the project and discharging to Oleta River State Park were retrofitted with Pollution Prevention CDS structures that are operated and maintained by the City's stormwater utility avoiding any potential adverse impacts to the protected mangrove areas. t-, I . ~J III! 12