HomeMy WebLinkAboutIII-Tab 4 Site Utility Study•
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BRICKELL VIEW TERRACE
MAJOR USE SPECIAL PERMIT
SITE UTILITY STUDY
Prepared for:
Brickell Holdings Group, LLC
Prepared by:
Consulting Engineering and Science, Inc.
January 30, 2006
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1. General
A. Project Location and Size:
The project is located along the north side of S.W. 10th Street in
the City of Miami; bounded on the east by S.W. 1st Court; bounded
on the north by S.W. 9th Street; .and, bounded on the west by
privately held property. The site has a total area of 50,382
square feet, or 1.16 acres. The site has approximately 200 feet of
frontage along S.W. 10th Street Road; approximately 300 feet of
frontage along S.W. 1st Court; and, approximately 200 feet of
frontage along S.W. 9th Street.
The land on which the project is proposed consists of three (3)
parcels, identified with Miami -Dade County tax folio numbers 01-
0207-000-1020/1150/1160. A legal description of the property is as
follows:
Lot 1, 2, 3, 4, 17, 18, 19 & 20, Block 70S of MIAMI KNOWLTON'S
SUBDIVISION, according to the plat thereof, as recorded in Plat
Book B, at Page 41, of the Public Records of Miami -Dade County,
Florida.
LESS
A portion of Lots 1, 2, 3 & 20, Block 70S of MIAMI KNOWLTON'S
SUBDIVISION, according to the plat thereof, as recorded in Plat
Book B, at Page 41, of the Public Records of Miami -Dade County,
Florida, more particularly described as follows:
Commence at the Northeast corner of said Lot 3; thence South
along the East line of said Lot 3 for a distance of 22.25 feet;
thence S89-58-01W for a distance of 16.02 feet to the POINT OF
BEGINNING; thence S00-01-59E for a distance of 31.64 feet;
thence N89-59-04E for a distance of 1.00 feet; thence SOO-01-
59E for a• distance of 128.83 feet; thence S89-58-01W for a
distance of 21.13 feet; thence NOO-01-59W for a distance of
3.60 feet; thence 589-58-OIW for a distance of 39.50 feet;
thence N00-01-59W for a distance of 159.40 feet; thence N89-58-
OlE for a distance of 25.90 feet; thence S00-01-59E for a
distance of 2.60 feet; thence N89-58-01E for a distance of
33.70 feet to the POINT OF BEGINNING.
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A portion of the site is currently occupied by an at -grade paved
parking lot; and, a portion of the site is currently vacant.
B. The proposed pro-iect build -out will be as follows:
Residential:
Retail:
119 units
900 sf
Net Lot Area 50,382 sf, or 1.16 acres
Gross Lot Area 93,632 sf, or 2.15 acres
Construction will consist of one (1) residential tower of 23
floors, including a ground level, 5 levels of parking, 2 levels of
amenities and 18 levels containing 119 condominium units; and, one
(1) parking garage of 7 levels.
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2. Drainage
A. Drainage Area
Upon development, approximately 85 per cent of the site will
be impervious and approximately 15 per cent of the site will
be pervious. Stormwater runoff will consist of rainfall from
the building roofs, driveways, walkways, landscape areas and
one-third of the vertical building surfaces.
The coefficient of runoff is calculated as follows:
85.0% (impervious) X 0.90
+ 15.0% (pervious) x 0.20
Overall coefficient
D. Existing Storm Drainage System
0.77
0.03
0.80
In the improved portion of the site, runoff is currently
directed to a number of catch basins located throughout the
existing parking areas from which the runoff is directed to
underground seepage trench/exfiltration trenches. In the
unimproved portion of the site, rainfall percolates directly
into the surface of the vacant land.
C. Proposed Storm Drainage System
The storm drainage system to serve this project will be
designed to direct the 5-year 1-day storm event to on -site
retention/exfiltration systems and to contain the 25-year 3-
day storm event on -site, as required to comply with the
applicable requirements of the Miami -Dade County Department of
Environmental Resources Management (DERM). While exfiltration
trenches will be reviewed for feasibility at this location, 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 catch basins and conveyed by pipes to the well
locations.
Runoff from driving surfaces such as driveways and walkways
will be diverted through baffled pollution control structures
which will capture the oils and greases prior to flowing into
the wells.
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Table 1
Preliminary Drainage Calculations
1. Total Net Area 1.16 Acres
a. Impervious
Roof/Driveways/Walks 0.99 Acres
1/3 Vert. Bldg. Surface 1.19 Acres
Total 2.18 Acres
b. Pervious 0.17 Acres
c. Adjusted Contributing Area 2.35 Acres
2. Adjusted Runoff Coefficient
2.18(0.9)+ 0.17(0.2)
2.35
= 0.85
3. Design Storm. 5 years
4. Time of Concentration 15 minutes
5. Rainfall Intensity 5.50 in/hr
6. Peak Runoff (Q) = CiA (0.85)(5.50)(2.35)
= 10.99 cfs
Assume each 24-inch diameter drainage well has a capacity of 1,000
gpm per foot of head; and, using 2.5 feet of available head:
Well Capacity = 1,000 gpm x 2.5 feet = 2,500 gpm per well
- 5.57 cfs per well
No. Wells = Peak Runoff = 10.99 cfs - 1.97 wells
Well Capacity 5.57 cfs
Provide two (2) - 24" diameter Drainage Wells
Detention Tanks: Provide 1.5 minutes of detention time of
storage in detention tanks:
Volume of tanks required to handle 10.99 cfs for 1.5 min.
10.99 cfs x 1.5 min x 60 sec/min = 990 cubic feet (cf)
Provide two (2) tanks (one with each well) with the following
approximate interior dimensions:
2 times 6'-8" (width) x 15' (length) x 5' (depth) = 1,000 cf
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3 Water Distribution
The project is located in the water service area of the Miami -
Dade Water and Sewer Department (WASD). Existing water mains
in adjacent streets are 2-inch and 8-inch, neither of which is
typically capable of providing the required domestic and fire
flow required for this project. As such, it is anticipated
that WASD and the Fire Department will require off -site water
system improvements to provide water service and fire
protection to this project.
The water and fire service connections to this project will be
made from those new water main improvements. The connections
will consist of domestic water services, fire line services
and cooling tower/irrigation water service, as applicable. 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.
Table 2
Water Usage
Residential Condominiums:
119 units @ 200 gpd/unit
Retail:
900 sf @ 5 gpd/100 sf
23,800 gpd
45 gpd
Total = 23,845 gpd
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4 Sanitary Sewer
The project is located in the sewer service area of the Miami -
Dade Water and Sewer Department (WASD). WASD currently has 8-
inch, 10-inch and 12-inch gravity sewer mains located in the
adjacent streets which appear to have adequate capacity to
serve this project. It is anticipated that new sewer laterals
will need to be installed from those existing sewer mains 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, it is
anticipated that no new pump station will be required to serve
this project. Anticipated sewage flow calculations are shown
below, in Table 3.
Table 3
Sewage Flow Calculations
Average Daily Flow (Table 2)
Average Daily Flow
Peak Flow (16.6 x 2.0)
23,845 gpd
16.6 gpm
33.2 gpm
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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.
The projected daily volumes of solid waste generation are
shown below, in Table 4.
Table 4
Solid Waste Generation
Residential Units:
Solid Waste
Retail:
Solid Waste
- 119 units x 1.42 tons/unit/year
- 169 tons/year
• 0.46 tons/day
920 lbs/day
- 900 sf x 3.08 lbs/sf/year
- 2,772 lbs/year
8 lbs/day
Total - 928 lbs/day
The project is located in the water and sewer service area of the
Miami Dade Water and Sewer Department (WASD).
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