HomeMy WebLinkAboutTab 3-Site Utility StudyTAB 3
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SUBSTANTIAL AMENDMENT
to
500 BRICKELL
to be known as
BRICKELL STATION
MAJOR USE SPECIAL PERMIT
SITE UTILITY STUDY
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Prepared for:
TRG - 500 Brickell Holding, Ltd.
Prepared by:
Consulting Engineering and Science, Inc.
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February 27, 2006
1. General
A. Project Location and Size:
The project is located along the east side of S.E. 1st Avenue,
situated between S.E. 5th Street on the north and S.E. 6th
Street on the south; in the City of Miami. The site, with a
net lot area of 20,256 square feet, or 0.47 acres, has
approximately 125 feet of frontage along S.E. 1st Avenue,
approximately 179 feet of frontage along S.E. 5th Street and,
approximately 145 feet of frontage along S.E. 6th Street.
The land on which the project is proposed consists of Lots 9,
10 and 11 Block 108-A as shown on the AMENDED MAP OF
BRICKELL'S ADDITION TO THE MAP OF MIAMI, accordingly to the
plat thereof as recorded in Plat Book B at Page 113 of the
Public Records of Miami -Dade County, Florida.
The site is currently vacant.
B. The proposed project build -out will be as follows:
Residential: 232 units
Retail 4,978 s.f.
Net Lot Area 20,256 s.f., or 0.47 acres
Gross Lot Area 47,807 s.f., or 1.10 acres
Construction will consist of a 53-story residential building.
The retail/commercial space will be developed within the
ground floor level.
2. Drainage
A. Drainage Area
Upon development, 95% of the site will be impervious and 5% of
the site will be pervious. Stormwater runoff will consist of
rainfall from the building roof, driveways, decks, landscape
areas and one-third of the vertical building surface.
The coefficient of run-off is calculated as follows:
95% (impervious) X 0.90
+ 5% (pervious) x 0.20
Overall coefficient
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0.86
0.01
0.87
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B. Existing Storm Drainage System:
Runoff from the site currently percolates directly into the
soils, with excess runoff flowing into the adjacent street
right-of-ways. There appears to be no evidence of drainage
problems or prolonged standing water on the site or in the
adjacent streets.
C. Proposed Storm Drainage System:
The storm drainage system to serve this project will be
designed to fully contain the 5-year 1-day storm event on -
site, as required to comply with the applicable requirements
of the Miami -Dade County Department of Environmental Resources
Management (DERM). It is anticipated that the stormwater
disposal system will include two (2) 24" drainage wells. See
supporting calculations, in Table 1. Runoff will be collected
through a system of drains and catch basins and conveyed by
pipes to the well locations.
Runoff from driving surfaces such as driveways and parking
areas will be diverted through baffled pollution control
structures which will capture the oils and greases prior to
flowing into the wells.
Table 1
Preliminary Drainage Calculations
1. Total Net Area 0.47 Acres
a. Impervious
Roof/Driveways/Walks
1/3 Vert. Bldg. Surface
0.45 Acres
1.87 Acres
2.32 Acres
b. Pervious 0.02 Acres
c. Adjusted Contributing Area 2.34 Acres
2. Average Runoff Coefficient 2.32(0.9)+ 0.02(0.3)
2.34
3. Design Storm
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= 0.89
5 years
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4. Time of Concentration 15 minutes
5. Rainfall Intensity 5.50 in/hr
6. Peak Runoff (Q) = CiA (0.89)(5.50)(2.34)
= 11.45 cfs
Assume each 24-inch diameter drainage well has a capacity of
1,000 gpm per foot of head; and, using 2.6 feet of available
head:
Well Capacity = 1,000 gpm x 2.6 feet = 2,600 gpm per well
= 5.79 cfs per well
No. Wells = Peak Runoff = 11.45 cfs = 1.98 wells
Well Capacity 5.79 cfs
Provide 2 - 24" diameter Drainage Wells
Detention Tank: Provide 1.5 minutes of detention time of
storage in tank:
Volume of tank required to handle 11.45 cfs for 1.5 min.
= 11.45 cfs x 1.5 min = 1,031 cubic feet (cf)
Provide two (2) tanks with the following interior dimensions:
2 x 6'-4" (width) x 16'-4" (length) x 5' (depth) = 1,034 cf
3. Water Distribution
The Miami Dade Water and Sewer Department (WASD) owns and
operates an 8-inch water main located in S.E. 5th Street; and,
a 6-inch water main in S.E. 6th Street fronting the property.
WASD had indicated that they will require water main upgrades
to serve this project.
The water and fire connections for this project will be made
from the upgraded water mains in S.E. 5th Street or S.E. 6th
Street. The connections will consist of a fire line service,
domestic water service and cooling tower/irrigation water
service. No on -site water wells are planned for this project.
The calculations for anticipated water usage required for this
project are shown below, in Table 2.
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Table 2
Water Usage
Residential Condominiums/Apartments:
232 units @ 200 gpd/unit = 46,400 gpd
Retail:
4,978 sf @ 5 gpd/100 sf = 249 qpd
Total = 46,649 gpd
4. Sanitary Sewer
The Miami -Dade Water and Sewer Department (WASD) owns and
operates 15-inch gravity sewer mains in S.E. 1st Avenue and in
S.E. 5th Street; and, an 8-inch gravity sewer main in S.E.
6th Street fronting the property. WASD had indicated that
they will require sewer main upgrades to serve this project.
It is anticipated that one or two gravity sewer connections to
these sewer mains will be utilized to serve this project.
Flow from this project will be directed to WASD pump station
PS-01 which currently has sufficient available capacity to
serve this project. Therefore, no pump station will be
required to serve the project. Anticipated sewage flow
calculations are shown below, in Table 3.
Table 3
Sewage Flow Calculations
Average Daily Flow (Table 2) = 46,649 gpd
Average Daily Flow = 32.4 gpm
Peak Flow (32.4 x 2.0) = 64.8 gpm
5. Solid Waste Generation
Solid waste generated by this project will be collected in
standardized on -site containers for refuse and recyclable
waste. Regular service will be provided by either private
hauling companies and/or the City of Miami Solid Waste
Department. Both will transport the waste to Miami -Dade
County's Disposal or Recycling facilities.
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The projected daily volumes of solid waste generation are
shown below, in Table 4.
Table 4
Solid Waste Generation
Residential Apartments:
Solid Waste
Retail:
Solid Waste
Total
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= 232 units x 1.42 tons/unit/year
= 330 tons/year
= 0.90 tons/day
= 1,805 lbs/day
= 4,978 sf @ 3.08 lbs/sf/year
= 15,332 lbs/year
= 42 lbs/day
= 1,847 lbs/day
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