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<br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br /> <br />Request for Qualifications <br />Civil Engineering Services to Design Street and Drainage Improvements RFQ#11-11-02 <br /> <br /> <br />Approach to the Proiect <br />As mentioned before, our Team performed a research of the existing conditions along 174th Street and studied the <br />constructability challenges of this project in order to propose feasible and practical solutions to the problems. Below is <br />a summary of the proposed roadway and drainage improvements as requested by the City in this RFQ. <br /> <br />Proposed Drainage Improvements: <br />Based on our analysis of the existing drainage conditions and in our experience in Miami Beach, we believe that the <br />proposed drainage system should be based on increasing the capacity of existing drainage infrastructures. New catch <br />basins, drainage wells, pipe upsizing and outfalls were considered in different alternative solutions for this project. <br />APCTE has designed several roadway and drainage improvements projects in Miami Beach with the same <br />characteristics of this project. Below is a summary of the alternative solutions that we have developed for 174th Street, <br />the construction implications of every alternative and our final recommendation to the City of Sunny Isles Beach: <br /> <br />Alternative 1: New Drainage System based on Gravitv Wells: <br />The proposed drainage system will replace all the existing catch basins, install <br />new drainage pipes (15" minimum diameter) and construct 4 to 5 drainage <br />wells with minimum separation of 100 feet. The proposed drainage well <br />structures will have double chambers and a baffle to comply with the 90 <br />second retention time required by the Florida Department Environmental <br />Protection (FDEP) (See Detail 1). Data regarding well capacity collected in the <br /> <br />'(WEU.... "IHlETTOP <br /> <br /> <br />~_PE_GIAl.s_TR4pTl.I~_E: <br />!:Q~g_~~(TX.~~h~ <br /> <br />Detail 1- Gravity Well Inlet <br />area indicates that the new wells will achieve a capacity between 800 gpm/ft of head and 1000 gpm/ft of head; which <br />is extremely good for a drainage system. The construction implications of this alternative will be the maintenance of <br />traffic, drilling the wells in a residential neighborhood, protecting the existing landscaping and conflicts with the <br />existing utilities. The only disadvantage of this alternative is that the proposed drainage system will rely only on the <br />capacity of the drainage wells without any overflow into an outfall. <br /> <br />~ <br /> <br />Alternative 2: New Drainage System based on a New Outfall: <br />As Alternative 1, the proposed drainage system will replace all the existing catch <br />basins, install new drainage pipes (15" minimum diameter) and construct a new <br />outfall (See Detail 2) that will discharge into the adjacent canal that is directly <br />connected to the Intracoastal Waterway. The construction implications of this <br />alternative will be the maintenance of traffic, protecting the existing <br />landscaping, conflicts with the existing utilities and the need for an easement to <br /> <br /> <br />I <br />I ,. ,... <br />If..J....'... <br />I' "ANATEE EXClUS'ON GIlAT. "", ( : \'\ <br />. \ f. ;,; - --. - ----OUTFAlL <br />\.l,,": . <br />/,',' ' --.,.,....,....,.,........,.,.,..,---..,1:,., <br />L__.~:~..~~.~~~..~..J _h <br /> <br />,;'. PROPOSED OUTFALL <br />.;~":' .. --1C-'.5 - <br /> <br />Detail 2 - Outfall wI Manatee Grate <br />install the new outfall. Additional permits will be required as well from the US Army Corp of Engineers for the new <br />outfall. The disadvantage of this alternative is the need for an easement to construct the mentioned outfall. <br /> <br />Alternative 3: New Drainage System based on Gravitv Wells and New Outfall: <br />The proposed drainage system will also replace all the existing catch basins, install new drainage pipes (15" minimum <br />diameter) and construct 4 to 5 drainage wells (See Detail 3) with minimum separation of 100 feet and new outfall hat <br /> <br />A&P CONSULTING TRANSPORTATION ENGINEERS, CORP. <br /> <br />23 <br />