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) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) Request for Qualifications Civil Engineering Services to Design Street and Drainage Improvements RFQ#11-11-02 OF sut! will discharge into the adjacent canal that is directly connected to the Intracoastal Waterway. The proposed drainage well structures will also have double chamber and a baffle to comply with the 90 second retention time required by the Florida Department Environmental Protection (FDEP). The construction implications of this alternative will be the maintenance of traffic, drilling the wells in a residential neighborhood, protecting the existing landscaping, conflicts with the existing utilities and the need for an easement to install the new outfall. Additional permits will be required as well for the new outfall from the US Army Corp of Engineers. The disadvantage of this alternative is the need for an easement to construct the mentioned outfall. .. "~I'").)JE:& / Co-JlN'Y;[XA . / ,~sun \',fH ORAl( .' .' 4)\I["....DI. CHr , . " \vru. ~:;:J~:TDj;~; "" ",. '. ,L!.~:~ _ ~i-.J-Co ,.. ,....::J '''UtI (" ~,..'" Sf.,llA'\l(TYPI /' I"P~ I flUJ,ll. 0\ CC\"[R''''I).A .. GRe.'/ITY WEt l MANUOlE Detail 3 - Gravity Well Manhole Alternative 4: New Drainage System based on Exfiltration System: As in the previous alternatives, the proposed drainage system will replace all the existing catch basins, install new drainage pipes (15/1 minimum diameter) and construct section of exfiltration systems between the new catch basins (See Detail 4). The proposed drainage structures that are directly connected to the exfiltration systems will be provided with retardant pollution baffles and 3.5' sumps as required by Miami-Dade County. Data of percolation tests collected in this area indicates poor percolation rates (10'5 gpm/ft), which - .-- PlASTIC filTER FAQRIC .. O'iCRlAP l' Mltl I ..1"....'......../--......,....,...... ..._h....1 1 "1 ' ..",ew, i . I -,.:~Jt~lI~~~~ !I!! P1f>EII~~~~._..-i:\ t ~201lNGW ~j~Q '! '''eA!.LAST i!\ ..,t;.8 80TTOMElfV'~\~ ROCK'\\:I \"PlASTlCfILTln !~gj "'!!!"!~L'V.~~;;;:':~h .f.AB'~u....mj. l':~~~E~~E _~C!~9_~ EXFltTRATIQN TRENCH DETAil _~_~~.~~_~.._.,_ww._._ gives us an indication that a drainage system based on exfiltration system is not Detail 4 - Exfiltration Trench recommended for this area of Sunny Isles Beach. The construction implications of this alternative will be the } maintenance of traffic, constructing the exfiltration system (15 feet deep) next to the adjacent buildings, protecting the existing landscaping and conflicts with the existing utilities. The disadvantage of this alternative is that the proposed drainage system will rely only on the capacity of the exfiltration system, which is not good in this area. Recommended Alternative: Based on the description of the above alternatives and our experience of this type of project, we strongly recommend Alternative 3 for this project due to the following reasons: . New catch basins and pipe will increase the collection capacity of the drainage system . Well infiltration rates in this area are very good . A new outfall will bring a safety factor to the system and more protection against flooding to 174th ST If the process of obtaining an easement becomes too expensive, the second best alternative would be Alternative 1. Roadway Improvements: After the new drainage is installed, milling and resurfacing of the existing pavement will be required. Special consideration should be given to the preparation of the Pavement Design Package. Signing and pavement marking plans will be also be part of this project. The proposed improvements will be coordinated with the local residential/business community in order to maintain or improve access to their properties. Permits Requirements: A Class II Permit from Miami-Dade Permitting, Environment and Regulatory Affairs (PERA) will be required if discharge into the adjacent canals is proposed. A Permit from the U.S. Army Corp of Engineers (USCOE) A&P CONSULTING TRANSPORTATION ENGINEERS, CORP. 24