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Home My WebLink AboutArticle 3 Tab 4 Site Utility Study� BRICKELL CITICENTRE • • South Miami Avenue and SE 8th Street Site Utility Study CTE Project No. 05-0210-40 Prepared by: CONSUL -TECH DEVELOPMENT SERVICES, INC. Florida Certificate of Authorization No. 9008 10570 N.W. 27th Street, Suite 101 Miami, Florida 33172 Tel. 305-599-3141 Fax. 305-599-3143 May, 2005 • • • I. INTRODUCTION The proposed project site is composed of two parcels bound by SE 7 ' and SE $' street and divided by South Miami Avenue. The proposed project will include three residential towers with parking garages, restaurants. office and retail spaces. The three towers will have a combined total of 2,424 condominium units. a 15.000 sq-ft restaurant, 130.823 sq-ft of office space, and 75.336 sq-ft of retail space. II. DRAINAGE SYSTEM For drainage design purposes, the site will be considered 100% impervious. Landscape and green areas are provided, but these areas will not be considered in the calculations in an effort to be conservative in the storm water management design. Storm water discharge will consist of runoff from rooftops, vertical building faces and pedestrian areas. Miami -Dade DERM requires that the proposed drainage system take into account 1/3 of the largest vertical building face for the DERM 5- year, 24-hour design storm only. The building faces exposed to the north will produce the largest amounts of runoff and will be accounted for in the calculations. The site land use can be summarized as follows: Total Net Impervious Vertical Total Lot Area Area Building Faces Drainage Area (Acres) (Acres) (33%) (Acres) (Acres) 5.55 5.55 3.40 8.95 The proposed drainage plan calls for all pavement runoff to be collected in catch basins capable of detaining the peak inflow from the Miami -Dade County DERM 5-year. 24-hour design storm for 90 seconds. These basins also contain baffles to prevent all oil, grease and foreign matter from flowing into the proposed system. The runoff will then flow into eight proposed drainage wells based on calculations found in Table 1. Runoff from building rooftops and vertical faces are uncontaminated by oil and grease and may be piped directly into to the drainage wells. The use of drainage wells is permitted by Dade County DERM in this area due to the high • • level of salinity found in the groundwater. Since the proposed system is using drainage wells to dispose of excess runoff, an exfiltration trench system will be designed to treat the larger of the first inch of runoff generated before disposing of any runoff. or 2.5 inches over the impervious area. The proposed well and exfiltration trench systems will keep the site dry during the DERM years - 24 hours storm, and keep the flooding below the site perimeter elevation during the SFWMD 25 years - 72 hours storm. The 100 years — 72 hours storm stage elevation should remain just below the building's Finished Floor Elevation. Both SW 7th and SW 8th Street are Florida Department of Transportation Right -of - Ways. According to Depai anent rules, additional calculations must be performed to prove to the Department that there will be no discharge into the State Right -of -Way. The drainage well system will be designed to retain the maximum storm stage of the 100-year, 1, 2. 4, 8, 24, 72. 168. and 240-hour storm events. IIh WATER DISTRIBUTION MASTER PLAN The Miami -Dade Water and Sewer Department (M-DWASD) provides the water service in this area. Currently, there is a 20-inch water main along SE g,h street. a 12-inch water main along South Miami Avenue. and a 6-inch and 8-inch water main along SE 7°' Street. Refer to the attached Water Atlas for additional information. According to the Miami -Dade Water and Sewer Rules and Regulations. at least two frontages of the property will have to be covered by a 12-inch water main. Therefore_ we estimate that the M- DWASD will not require the construction of any new water main for this project. Nevertheless, it will probably require the developer to make a contribution towards the construction of a new 12-inch water main along SE 7th Street for the entire frontage of the property. The anticipated average daily water consumption for the entire project is 535,049 GPD, and is calculated as shown in Table 2. • • I\'. SANITARY SEWER MASTER PLAN The Miami -Dade Water and Sewer Department (MD-WASD) also provides the sanitary sewer service in this area. There is an existing 8-inch gravity sanitary sewer main running along SE 8T. Street and a 10-inch along SE 7"' Street. It appears that the sanitary sewer services to the proposed development will be provided by sanitary laterals connected to the existing sewer main surrounding the property. Nevertheless. we are not sure if the existing sewer lines have adequate capacity for this project. This information will be available only after M-DWASD completes their modeling analysis. Depending on the outcome of the M-DWASD modeling, it is possible that new sanitary sewer main will be required for this project. This project is anticipated to generate an average daily sewage flow of 535,049 GPD, and is calculated as shown in Table 2. The wastewater produced by the site will travel via the existing sanitary sewer system to the MD-WASD Regional Pump Station No. 1. Pump station No. 1 is currently operating for 4.87 hours per day. According to DERM, the additional 535,049 GPD flow from this project together with reserved flows from other projects proposed in the area will put the pump station NAPOT at 6.07 hours per day. Thus, the pump station is deemed capable of handling the proposed flow from the project. Pump Station No. 1 transmits all flows directly to the MD -NASD treatment plant on Virginia Key for final treatment before discharge into the Atlantic Ocean. Refer to the attached Miami -Dade DERM projections for more information. • • • ' '. SOLID WASTE GENERATION Solid waste generated will be placed in standardized on -site containers for refuse and recvclables per the City of Miami Code, for regular pickup by private hauling companies and/or the City of Miami Solid Waste Depaitiiient. The solid waste will then be transported to Miami-Dade's Disposal Facilities. Actual waste pick-up locations will be shown in the architectural plans. This project is anticipated to generate an average daily solid waste volume of 8.889 Cu. Yd/month, and is calculated as shown in Table 3. Generation rates were determined from data provided by the Miami -Dade County Department of Solid Waste. • • • TABLE 1 BRICKELL CITICENTRE DRAINAGE CALCULATIONS Total Net Lot Area = 5.55 Acres Total Drainage Area = 8.95 Acres 1. Impervious = 100% or 8.95 Acres 2. Pervious = 0% or 0.00 Acres 2. Average Runoff Coefficient 3. SFWMD Design Storm Information 0.98 1. 5-Year 24-Hour Storm (Miami -Dade County W.C. 1.1) Rainfall Intensity = 6.10 inches per hour Purpose = Flood Protection Peak Runoff = CIA = (0.98)(6.10)(8.95) = 53.5 cfs 2. SFWMD 25 Year - 72 Hour Storm (Miami -Dade County W.C. 1.1) Rainfall Intensity = 7.30 inches per hour Purpose = Perimeter Berm Peak Runoff = CIA = (0.98)(7.30)(5.55) 39.7 cfs 3. SFWMD 100 Year - 72 Hour Storm (Miami -Dade County W.C. 1.1) Rainfall Intensity = 8.50 inches per hour Purpose = Finished Floor Elevation Peak Runoff = CIA = (0.98)(8.50)(5.55) = 46.2 cfs 4. FDOT 100 Year - 1 Hour Storm Rainfall Intensity = 5.00 inches per hour Purpose = Discharge to Biscayne Blvd. Peak Runoff = CIA = (0.98)(5.00)(5.55) = 27.2 cfs FDOT Design Storm Information Storm Duration Rainfall Amount (Inches) • • • 1 Hour 2 Hour 4 Hour 8 Hour 24 Hour 72 Hour 168 Hour 240 Hour Well Data 5.0 (Figures 5-1 & 5-11) 6.3 (Figures 5-1 & 5-1 1) 7.8 (Figures 5-1 &'z 5-111 9.6 (Figures 5-1 & 5-11) 14.0 (Figure 5-13) 19.0 (Figures 5-14 & 5-15) 20.0 (Figure 5-16) 23.0 (Figure 5-17) 1. Well Diameter Assumed Well Capacity 5. Mean High Tide Elevation 6. Specific Gravity Head Loss 7. Proposed Number of Wells 24 Inches = 500 gprni t. of Available Head = 2.00 ft. (taken from WC.. 20_034-A) = 2.00' = 5. Hydraulic Grade Line Elevations at Well Structure 1. 5 Year DERM Storm = (53.5 cfs)/[(500 gpm/ft head)(0.002228 cfsigprn)(12 wells)} + (2.00 + 2.00) = 8.00' NGVD SFWMD 25 Year - 72 Hour Stotts (39.7)4(500 gpm)(0.002228 cfsigpm)(12 wells)] + (2.00 + 2.00) = 6.97' NGVD 3. SFWMD 100 Year - 72 Hour Storm = (46.2)4(500 gpm)(0.002228 cfsigpm)(12 wells)] ± (2.00 + 2.00) = 7.46' NGVD 4. FDOT 100 Year - 1 Hour Storm (27.2 cfs)f[(500 gpm)(0.002228 cfsigpm)(12 wells)] + (2.00 + 2.00) =6.03'NGVD • • • Residential Towers 2,424 units Restaurant 668 Seats Office Space 130,823 SF Retail Space 75.336 SF TABLE 2 BRICKELL CITICENTR.E ANTICIPATED AVERAGE DAILY FLOW OF WATER AND WASTEWATER 200 gpdiunit = 484,800 gpd (Zu 50 gpd. seat = 33.400 gild (r 10 gpd/100 SF = 13.082 gpd L' 5 gpd,%100 SF = 3.767 gpd Total = 535,049 gpd ANTICIPATED AVERAGE DAILY FLOW WASTEWATER Average Flow 0.535 mgd Peak Flow — 2.006 mgd NOTES: l . Peak flow uses a factor of 3.75 times average flow (Recommended Standards for Wastewater Facilities, 1990 Edition) 2. gpd = gallons per day 3. No industrial wastewater is anticipated to be generated 4, mgd = million gallons per day • • • TABLE 3 BRICKELL CITICENTRE SOLID WASTE GENERATION Residential Towers 2.424 units a` 1.25 cu. yds %month per unit = 3,030 cu. vds.: month Office and Retail Space 206,159 SF of office / retail space 0.25 cu. yds per 100 SF /month = 515 cu. yds month Restaurant 668 seats restaurant (4.) 0.80 cu. yds per seatfmonth = 5,3= 4 cu. yds.-month Total anticipated Solid Waste generation = 8,889 Cu. Yds. /month • 4111 Pearly. MIAMI-DADE COUNTY DERM Pump Station No.1 Usage and Projections kPump Station MonthlW Station..30 -0001 Atlas Pg..F14 MIAMI DADE WIlTER 6 SEWER DEPFRTMENT flddr...390 HW NORTH RIVER DR Sec -Township -Range 1-54-41 Genr. ET clock.Y Telm.'t #Pumps. 8 Pump lype.f •5tn class.M 5pee0.2 Hrspwr.+ Res fl3m(gp0) Proj Hapot Plans.. 6,120,087 5srs Plats.. 0 4.87 tars Extens. 0 4.67 hrs % Cep 59.70 48.70 48.70 Oats • 01/28/2005 12/28/2004 11 /I'.3/2004 10/25/2004 09/24/2004 08/25/2004 07/27/2004 Mo . HAPOT Avg Deil 9 rl oius 4.35 30.48 4.33 30.34 5.54 38.79 6.18 43.29 5.81 40.70 6.50 46.51 0.00 3,64 25.50 0.00 Signature.. 3RRC1M • 0.00 0.00 0.00 0.00 0.00 Information N. 27E Review, moratorium..OK Moratorium effective since / / Yeerlw NAPOT (hr s) . Stn Gross Cepecity(gpd). Station Reduction Factor Stn Het Cep Certif(gpd). 5tn Nat Capacity(W)- Indicated Flows(gpd) 4.87 . 221.750,000 0. 60 0 . 133,056,000 25,999,28 Rgd # Comments Fig Pmp Y 8 Y 8 Y 8 Y 8 Y 8 Y 8 Y 8 Sign Lake..12/20/2004 17:40:49.89 oCac. ..34)-k- 6,l7-0,0E7 (? zccr + 555,O'i ( 6541,416 6rf) �3,65`,yt6 x 133,056font::, PS 6.07 C. . i WATER ATLAS (M-DWASD) • ;TATION . 3070 • T""'" " . 114 3085 r, i47 161 48 149 15c 3108 1 a 209A 209, < 12` 841A 0 5964 1 840 4055 egg. 5949 \ SEWER ATLAS (M_BWASD) 1 48 193 o' I z r:.- Q u' 1 ��* _s* 3'i94 157,iZ 208 5968 832 PRc Ecr S rr 834 8�__.._ 830 ; s• 835 836 1 '3052 48 __SW 10^ 4915 1 SI 127 sal 5927 829 s 3022 1 183 84 85 186 2850 5927 30231 1 3025 1 15'�15" ,. 182 SEfiST '3050 1 SE 7 ST • -201 821 a 1 64 -s B20 827 824 822 5628 823 .__ 823 5950 1 819 2