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Home My WebLink AboutSite Utility Study• • Infinity Site Utility Study Infinity MAJOR USE SPECIAL PERMIT SITE UTILITY STUDY PREPARED FOR Colonial Development Group, L.L.C. by: KIMLEY-HORN AND ASSOCIATES, INC. 420 LINCOLN ROAD, SUITE 353 MIAMI BEACH, FL 33139 NOVEMBER 2003 Page 1 • • • Infinity Site Utility Study Introduction The Infinity Building is a proposed 52 story mixed -use high rise building to be located on an approximate 1.0 +I- acre property located on the south side of Southwest 13th Street between Southwest 1st Avenue and South Miami Ave, in the City of Miami, Miami -Dade County, Florida (see site location map -Fig 1). The development consist of a total of 433 residential apartments units (408,180 sf), 42,120 sf of office spaces, 8,999 sf of storage space, 6,346 sf of retail/cafe, and approximately 600 parking spaces. Table 1, below depicts the phase details of the proposed project. Table 1: Project Summary esdettal Reria1 ifce, 1/ca1e f ur age St 1<'arng 433 408,180 42,120 6,346 8,999 600 Infinity Site Utility Study Page 2 • Infinity Site Utility Study Figurel: Site Location Map Page 3 • • • I. Drainage Existing Drainage Presently, the site is completely vacant. There is no existing drainage system on -site. Proposed Drainage System The drainage system for the development will consist of a series of drainage wells. This will allow the storm runoff to be fully contained and disposed of on site. The project will be designed consistent with a 5-year design storm event, in accordance with Section D-4, "Water Control", of Part 2 of the Miami -Dade County Public Works Manual. It is anticipated that five (5) 24" drainage wells will provide sufficient capacity to dispose of the design storm runoff contributed the proposed development. Preliminary drainage computations for the project areas are provided in Tables 2, which includes the basis for design. The final drainage design for the project should be in conformance with the requirements of the Miami -Dade County DERM Water Control Section, Florida Department of Environmental protection, and other local, State and federal regulatory agencies having jurisdiction over the project. Runoff Generation Infinity Site Utility Study Table 2: Drainage Calculations Total Net Site Area 1.00 Acres Impervious Area 0.41 Acres Roof Area 0.46 Acres Exterior Wall Area (1/3 NE corner wall areas) 135,446*1/3 +47,743*1/3 = 61,060 sf = 1.40 Acres Page 4 • • • Total Impervious Area 2.27 Acres Pervious Area (green areas) 0.13 Acres Total Contributing Drainage Area 2.40 Acres Table 2 (Cont'd): Phase I Drainage Calculations Average Runoff Coefficient (C) Impervious Site Area = 2.27 x (0.90) Pervious Site Area = 0.13 x (0.30) = 2.04 = 0.04 Average Runoff Coefficient (C) = (2.04 + 0.04) /2.40= 0.87 Design Stoiui 5 Year Return Frequency Time of Concentration 10 min. Rainfall Intensity (I) 6.10 in/hr Peak Runoff (Q) = CIA = (0.87) (6.10) (2.40) = 12.74 cfs Assume each 24" diameter well flows at 760gpm / per ft of head = 12.67 gps = 1.69cfs Peak Runoff / Flow per Well = 12.74cfs / (Ave. 1.5 ft of head x 1.69 cfs) = 5.03 wells Provide 5 - 24" Diameter Wells Detention Tank Design Criteria: 1.5 minute (90 sec) detention time per detention structure Volume of Tank required for (12.74cfs x 90 sec.) / 8 = 143.33 cubic ft / tank Interior Tank Dimensions: h' (width) x 3' (height) x 10' (length) = 143.33 cubic feet each h=4.78 Provide 1 tank for each well, of 143.33 c.f. volume each Infmity Site Utility Study Page 5 • • • II. Water Distribution System The water mains owned and operated by the Miami -Dade Water and Sewer Department (MDWASD) in the vicinity of the project is shown in the Table 3. Table 3: Existing Water Mains S.W. 13` ST.�.. _..... S. Miami Ave. and S.W. lst Ave. 4" D.I. S.W. 14th ST. S. Miami Ave. and S.W. ls` Ave. 6" D.I. In accordance with County criteria, MDWASD will most likely require the installation of a new 12-inch ductile iron (D.L) water main on SW 13th Street and a 12" water main on 14th Street along the property frontage. Currently there are plans for a 12" water main extension on SW 13th from S. Miami Ave. to the East property line of the subject property. The new 12" water main for this site will most likely be connected to the recently extended water main. The probable 12" water main extension along SW 14th Street will need to be extended along the frontage of the property and be connected to either the existing 12" along SW 1st Ave, or the existing 16" along S. Miami Ave. A request for a Water and Sewer Availability Letter should be submitted to MDWASD, to determine the specific points of connection and other requirements. A copy of the MDWASD water atlas sheet for the project area has been attached. Infinity Site Utility Study Page 6 • • ITT. Sanitary Sewer Collection System Table 4 depicts the sanitary sewer mains owned and operated by Miami -Dade Water and Sewer Department (MDWASD), within the vicinity of the project. Table 4: Existing Sanitary Sewer Mains ttaion v � p}� � 3M!* 4� \ C :' . tee. ._... � .,... ... ✓ r _�.... .......... ✓" .. .. SewervMa \$: \ ��. . _. S.W. 13th ST. S. Miami Ave. and S.W. 15L Ave. 20" Force Main 8" Gravity Main S.W. 14th ST 1st S. Miami Ave. and S.W. I Ave. 8" gravity main A copy of the MDWASD Sewer Atlas sheet has been attached. The proposed on -site sanitary sewer system for the property can possibly be connected to either or both of the existing public mains. There is a possibility that the existing sanitary sewer line does not have the capacity for the proposed project. A letter of availability and further coordination with MDWASD is recommended to verify proposed sanitary sewer service connection points and requirements for this project. The flows from the existing MDWASD sanitary sewage mains on South Miami Avenue and SW 13`t' and 14th Street are received by MDWASD Regional Pump Station 1, which is located at 390 NW North River Drive. Pump Station No. 1 is currently operating at an average yearly NAPOT of 4.67 hours/day, approximately 50% of the maximum allowed by EPA, and is presently not under any type of moratorium (see attached pump station report). It is not anticipated that any improvements to the regional pumping and/or transmission systems will be required to connect the proposed project. The additional flows created by these projects have been determined and are shown in Table 5. Infinity Site Utility Study Page 7 • • • Table 5: Water & Sewer Flow Generation Apartment Office Retail 433 units 200 gpd per unit 86,600 42,120 sf 6,346 sf 10 gpd per 100sf 5 gpd per 100sf 4,212 317 Total Anticipated Flow 91,129 gpd IV. Solid Waste Generation Solid waste generated by this project will be collected in standard on -site containers for refuse and recyclables. Regular pick-up service will be provided either by private hauling companies and/or by the City of Miami Solid Waste Department, who will transport the waste to Miami -Dade County's or private disposal and recycling facilities. The volumes of solid waste projected to be generated by the project are shown in Table 6. Table 6: Solid Waste Generation 2.;.v'9 "✓ ",,,'a'„v r c r t' '� ' ^ on Apai talent 433 units 51bs/unit/day 1.08 Office 42,120 sf 6lbs/1000 sf/day .13 Retail 6,346sf 6lbs/1000 sf/day .02 Total Anticipated Solid Waste Generated 1.23 Infinity Site Utility Study Page 8 • Attachment A Existing Utility Records • • SEwtn, trus H • scums DE ELE SCHOOL BRICKEL 219 2 UJLsTEfL iXTLE J 1\ • Attachment B Pump Station Monthly Information • • "'rump oration Monthly Information v: LL= �; '� „n Rev: Station..30 --0001 Atlas Pg..F14 Moratorium MIAMI DATJE WATER & SEWER DEPARTMENT Rddr..390 NW NORTH RIVER DR Sec -Township -Range. 1-54-41 Genr. ET clock.Y Telm.Y #Pumps. 8 Pump Type.A Stn Class.M Speed.2 Hrspwr.+ Res flow(gpd) Prof Mapot Plans.. 7,548,488 6.03 hrs Plats.. 0 4.67 hrs Extens. 0 4.57 hrs % Cap 50.30 46.70 46.70 Date Mo.NAPOT Avg Daily Flows 09/24/2003 08/25/2003 07/25/2003 06/25/2003 05/27/2003 04/25/2003 03/27/2003 Ready. • 6.09 42.61 0.00 4.87 34.10 0.00 5.01 35.04 0.00 5.95 41.63 0.00 5.24 36.66 0.00 4.19 29.31 0.00 4.63 32.41 0.00 Signature.. GARCIM Moratorium effective since / / Yearly HAPOT (hrs) 4 Stn Gross Capacitty(gpd)..221,760, Station Reduction Factor 0 Stn Net Cap Certif(gpd).. Stn Het Cepacity(gpd).....133,056, Indicated Flows(gpd) 25,890, Rgd # Fl g Pmp Y 8 Y Y 8 Y 8 Y 8 Y 8 Y 8 Comments Sign Date..08/11/2003 06:15:10.(