HomeMy WebLinkAboutTab 3 Site Utility Study.•
3760 BIRD ROAD
SITE UTILITY STUDY
Prepared for:
H & H Development, Inc.
Prepared by:
Consulting Engineering and Science, Inc.
November 6, 2006
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Genera,
A. Project Location and Size:
The project is located along the south side of Bird Road (S.W.
40th Street); bounded on the west by S.W. 38th Avenue; on the
south by Peacock Avenue and on the east by S.W. 37th Court in
the City of Miami. The site, with an area of 76,083 square
feet, or 1.75 acres, has approximately 277 feet of frontage
along Dird Road (S.W. 40th Street), approximately 268 feet of
frontage along S.W. 38th Avenue, approximately 277 feet of
frontage along S.W. 37th Court and approximately 278 feet of
frontage along Peacock Avenue.
The site is currently occupied by a single story car
dealership with at -grade parking.
B. The proposed project build -out will be as follows:
Office:
Retail:
Restaurant:
Site Area .
Construction will be a
including office, retail
drive-thru and
parking will be
drive-thru will
Peacock Avenue;
Avenue.
2 Drainage
319,607 sf
15,283 sf
8,000 sf
76,083 sf, or 1.75 acres
mixed use multi -story building
and restaurant uses with a bank
interior parking. Access to the interior
from S.W. 37th Court; access to the bank
be from S.W. 37th Court, with egress to
and, loading access will be from Peacock
A. Drainage Area
Upon development, 90 percent of the site will be impervious
and 10 percent of the site will be pervious. Stormwater
runoff will consist of rainfall from the building roof, decks,
landscape areas and one-third of the vertical building
surface.
D. Existing Storm Drainage System:
Runoff from the site is currently directed to a number of
catch basins located throughout the existing parking areas
from which the runoff is directed to underground seepage
trenches/exfiltration trenches.
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Proposed Storm Drainage System:
The storm drainage system to serve this project wii..l he
des_gned to contain the 5-year 1-day storm event and the 25-
year 3-day storm event on --site, and will be designed to
protect the first floor elevations from the 100-year 3-day
storm event, as required to comply with the applicable
requirements of the Miami -Dade County Department of
Environmental Resources Management (DERM) and the South
Florida Water Management District (SFWMD) . It is anticipated
that the stormwater disposal system will include three (3) 24-
inch 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 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 Site Area 1.75 Acres
a. Impervious Area
Roof/Decks/Walks
1/3 Vert. Bldg, Surface
1.57 Acres
1.67 Acres
3.24 Acres
b. Pervious Area 0.18 Acres
c. Adjusted Contributing Area 3.42 Acres
2. Average Runoff Coefficient 3.24(0.9)+ 0.18(0.2)
3.42
3. Design Storm
4. Time of Concentration
5. Rainfa11 Intensity
6. Peak Runoff (Q) = CiA
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0.86
5 years
15 minutes
5.50 in/hr
(0.86) (5.50) (3.42)
16.18 cfs
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Assume each 24-inch diameter drainage well has a capacity of
750 qpm per foot of head; and, 4.00 feet of available head:
Well. Capacity _ 750 gpm x 4.00 feet _- 8,000 gp-nper we.l.l.
6,68 cls per well
No. Wells = Peak Runoff = 16.18 cfs = 3.42 wells
Well Capacity 6.68 cfs
Provide three (3) - 24-inch diameter Dranac Wells
Detention Tank: Provide 1.5 minutes (90 seconds) of detention
time of storage in tank for surface area only (excludes 1/3 of
the vertical building surfaces):
Q = (0.86)(5.50)(1.75) = 8.28 cfs
Volume of tank required to handle 8.28 cfs for 90 seconds:
V = 8.28 cfs x 90 sec = 745 cubic feet (cf)
Provide three (3) tanks of the following interior dimensions:
V = (3)[5' (width) x 10' (length) x 5' (depth)] = 750 cf
3. Water Distribution
The Miami -Dade Water and Sewer Department (WASD) owns and
operates a 48-inch, a 42-inch, a 12-inch and an 8-inch water
main located in Bird Road (S.W. 40th Street); a 12-inch and a
4-inch water main located in S.W. 37th Court; a 12-inch water
main located in Peacock Avenue; and, a 6-inch water main
located in S.W. 38th Avenue.
WASD has indicated that a 12-inch water main extension will be
required in S.W. 38th Avenue, interconnecting the existing 42-
inch water main in Bird Road with the existing 12-inch water
main in Peacock Avenue. The water and fire connections for
this project may be made from the existing 12-inch water main
located in S.W. 37th Court, the existing 12-inch water main
located in Peacock Avenue or the new 12-inch water main
located in S.W. 38th Avenue. 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
Office:
319,607 sf 8 10 gpd/100 sf
Retail:
15,283 sf 6 5 gpd/100 sf
Restaurants (8,000 sfL:
120 seats 6 50 gpd/seat
Total
4. Sanitary Sewer
31,961 gpd
764 gpd.
6,000 gpd
= 38,725 gpd
The Miami -Dade Water and Sewer Department (WASD) owns and
operates 10-inch gravity sewer mains located in SW. 38th
Avenue and in Peacock Avenue; and, a 36-inch gravity sewer
main located in S.W. 37th Court. WASD has indicated that a
sewage capacity engineering analysis will need to be performed
to verify that adequate capacity is available to serve this
project. Provided that such capacity is available, it is
anticipated that gravity sewer connections to the 10-inch
gravity sewer main located in S.W. 38th Avenue and/or the 10-
inch gravity sewer main located in Peacock Avenue will be made
to serve this project. An on -site pump station is not
expected to 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) = 38,725 gpd
Average Daily Flow = 27 gpm
Peak Flow (ADF x 2.0) = 54 gpm
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5 Solid Waste Generation
Solid waste generated by this project 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 or Miami -Dade
County Department of Solid Waste. Both will transport the
waste to Miami -Dade County, s di_sposal or recycling facilities.
The projected daily volumes of solid waste generation are
shown below, in Table 4
Table 4
Solid Waste Generation
Office:
Solid Waste
Retail:
Solid Waste
Restaurants:
Solid Waste
Total
319,607 sf @ 3.08 ibs/sf/year
984,390 lbs/year
2,697 lbs/day
15,283 sf @ 3.08 lbs/sf/year
47,072 lbs/year
129 lbs/day
120 seats x 2.38 lbs/seat/day
104,244 lbs/year
286 lbs/day
3,112 lbs/day
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