A&P Consulting - Laserfiche WebLink

Home Browse Search

A&P CONSULTING TRANSPORTATION ENGINEERS, CORP. GOLDEN SHORES PUMP STATION REHABILITATION (CCNA) RFQ 18-11-01 6 UNDERSTANDING OF SCOPE OF SERVICES The City of Sunny Isles Beach sits along the Atlantic Ocean threatened by rising seas and major tropical storms. The sea level around the City has risen steadily in recent decades and flooding in the streets has become more frequent and severe. Most of the City sits just four to five feet above sea level, and on a foundation of porous limestone, making it especially susceptible to tidal flooding and surging oceans. In order to mitigate these nuisances, the City is taking positive and unprecedented steps to protect itself from sea level rise. The Golden Shores Neighborhood is located on the northwest corner of the City of Sunny Isles Beach, bounded by the William Lehman Causeway on the north; 185th St on the south; Collins Ave on the east; and the Intracoastal Waterways on the west. This neighborhood is mainly residential and cover an area of approximately 70 acres. The existing drainage system is based on swales with catch basins located at several locations that collects runoff generated by roads and adjacent properties. It is observed that some of the existing inlets were recently replaced and upsized. These drainage structures are connected to a storm sewer transmission system, which ultimately discharges into the existing Stormwater Pumping Station. The existing Station is located at the northwest corner of this neighborhood and could be accessed thru N. Bay Road. Existing Golden Shores Pump Station: The existing Pump Station has the following components: Trash Rack Structure: This structure collects the stormwater from the Golden Shore drainage system and discharges into the station wet well. It has a steel trash rack that trap any floating debris carried carried by the water. Trash rack has visible corrosion issues. Wet Well Structure: Wet well has two chambers; the bottom chamber includes all the influent and effluent pipes as well as pump intakes, while the top chamber includes pump motors, controls, electrical connections, etc. The two chambers are divided by a steel grate. Access to the wet well is from the top of the building thru a hatch. The top of the wet well is metallic and has leakage. There is an emergency by-pass sluice gate that discharges into the downstream structure; which is also leaking. Pumps: The existing 2 pumps are axial pumps manufactured by Couch Pump Company. There are two sizes of pumps within the wet well. The larger pump is Model NW 320 x 20 with a nominal capacity of 12000 gpm. Pumps are installed in a steel casing that connects into the control structure via two check valves. According to the City’s staff, the existing pumps were recently refurbished. Control Structure: This structure receives the storm water from the pumps and discharges by gravity in two drainage wells, one located at the bottom of the structure and the second located 200 feet from the pump station. The existing control structure has a weir that overflows into the Intracoastal Waterways via an outfall pipe. Back flows are prevented with a Tideflex valve. Generator Room: This part of the building is also accessible from the top, thru a hatch. The existing generator is outdated and has a capacity of 252 KW. The City expressed its desire to move the generator outside the building. Most of the electrical control panels are inside the generator room. Issues of accessibility, safety and ventilation should be addressed. Level Gauge: Located at the trash rack, records the water level upstream of the existing pump station. SECTION D - PROJECT APPROACH AND UNDERSTANDING