LTC 232-2002
CITY OF MIAMI BEACH
Office of the City Man:s~
Department Memorandum No. ~. ~ a2t't?Y --'
m
To:
Richard Steinberg Date: October 9, 2002
Commissioner
From:
Jorge M. Gonzalez ~ ~
City Manager U .- u
Subject: 63RD. STREET FL VOYER
Pursuant to your request, the Public Works Department looked into the alternative of
lowering the existing roadway under the f1yover to achieve a 14'-0" vertical clearance
between the bottom of the f1yover structure and the road surface.
The scope of work for the above alternative is:
. Lower and regrade approximately 500' of roadway along Indian Creek Drive and
430' along 63rd street from the bascule bridge to Collins Avenue.
. Demolish and reconstruct at least two pile caps/pier footings to meet the new
roadway elevations.
. Build new columns/pier extensions to connect to the new pier footings.
. Install a construction dewatering system.
. Install sheet piles and a retaining wall system to maintain existing elevations at the
adjacent right-of-way.
. Lower existing utilities; including water mains, sanitary sewer systems, and gas
mains.
. Install sanitary sewer lift pump stations.
. Install a new stormwater drainage system with injection wells/pump stations, and
back-up power supply system.
The "rough order of magnitude" cost estimate to lower the roadway to create a 14'-0"
vertical clearance at the existing 63rd Street f1yover is $3.2 million (Attachment 1). It is
estimated that in order to perform the above work, the intersection will be continuously
disrupted or closed for about 4 to 5 months.
I
Although you requested that we estimate the cost to lower the road to a vertical clearance
of 14'-0", it should be noted that the 2002 Standard Specifications for Highway Bridges
published by the American Association for State Highway Transportation Officials
(AASHTO), requires all bridges on arterial (Indian Creek Drive) and collector roadways to
have a minimum vertical clearance of 16'-0". This AASHTO publication is the national
standard for bridge construction. The Florida Department of Transportation's (FDOT)
Design Manual requires 16'-6" as a vertical clearance to allow 6" for future road
resurfacing. However, FDOT designers in telephone conversations with the City Engineer
indicated that a 16'-0" vertical clearance would be acceptable. We therefore prepared
another cost estimate for a project to lower the road under the flyover to provide a vertical
clearance of 16'-0".
The "rough order of magnitude" cost estimate to lower the roadway to create a 16'-0"
vertical clearance without demolishing the flyover is $3.8 million (Attachment 2). Because
of additional depth this project will require lowering the existing utilities and roadway
modification of approximately 720' along Indian Creek Drive and 430' along 63rd street from
the bascule bridge to Collins Avenue. It would also require a special roadway base and a
dewatering system because the roadway surface would be closer to the existing high water
table. For this work, it is estimated the intersection would be disrupted or closed
approximately 6 to 7 months. The City's long-term maintenance cost for the storm water
and sanitary sewer pumping systems is estimated to be $12,000 per year. If a pump
needs to be replaced, it would cost from $120,000 to $180,000.
The current cost estimate for building an at-grade intersection and demolishing the f1yover
is $3.7 million. The current Management of Traffic plan for this alternative keeps the
intersection open at all times in all directions with reduced traffic lanes during construction.
For your information, the demolition of the 63rd street flyover is an FDOT priority safety
project because of the following:
. Substandard vertical clearance of 11'-8" compared to the AASHTO standard of
16'-0".
. Inadequate pavement width; there is no emergency lane.
. High accident rate intersection due to reduced visibility to southbound and
eastbound drivers caused by the f1yover structure.
. No pedestrian crosswalks either mid-block on Indian Creek Drive, or on the west
side of Indian Creek Drive.
The alternative of lowering the roadway and keeping the flyover, only resolves the vertical
clearance issue, but does nothing to solve the other three safety issues listed above.
Comparatively, the demolition of the existing, below standard one-lane f1yover, combined
with the construction of a modern at-grade alternative, will provide the City with a
functionally-effective and safer intersection, because it will resolve all four safety issues for
vehicular traffic and pedestrian circulation. This project will result in a more aesthetically
pleasing roadway and intersection than a lowered roadway under an old and unsafe
flyover.
In addition the recommended at-grade solution will improve the overall intersection level-of-
service (LOS), in particular adding capacity to the eastbound approaches during the PM
peak hour. Also, the intersection would remain open during construction. Please note that
any design alternative selected would not improve the LOS for the AM southbound
approaches to the intersection. No capacity improvement for this movement will be
possible without major reconstruction and widening of the 63rd Street Bridge and overall
corridor.
Based on the above information, my recommendation is that we continue with the planned
demolition of the 63rd Street f1yover and the construction of a new at-grade intersection.
I free to contact me if you have any other concerns or questions.
hi
B\A V\II
City of Miami Beach
Public Works Department
Proiect: Cost estimate for lowering existing roadway by 2.5 feet at North and South of 63rd street Fly Over.
(Vertical Clearance 14'-0").
DESCRIPTION UNIT UNIT PRICE QUANTITY I AMOUNT
A Materials and equipments
1 Mobilization LS $162,959.00 1 $162,959.00
2 Regular excavation CY $12.00 13,237 $158,842
3 Stabilized subgrade (12") SY $5.00 8,825 $44,122.73
4 Limerock base (8" thick) SY $12.00 8,825 $105,894.55
5 Asphaltic concrete (2" thick) SY $4.00 7,917 $31,666.15
6 Median Concrete Curb (6") LF $12.00 700 $8,400.00
7 Curb and Gutter (24") LF $20.00 1,241 $24,816.42
8 Sidewalk (4") Sf $7.50 6,227 $46,702.47
9 Light poles EA $2,800.00 6 $16,800.00
10 Traffic Signal EA $80,000.00 1 $80,000.00
11 Retaining wall/sheet piling 4 comers LF $550.00 890 $489,500.00
12 Water Main (12" diam pipe) LF $350.00 300 $105,000.00
13 Water Main (10" diam pipe) LF $285.00 250 $71,250.00
14 Fire Hydrant EA $990.00 2 $1,980.00
15 Sanitary Sewer pipe LF $250.00 400 $100,000.00
16 Sanitary Sewer Pump LS $200.00 1 $200.00
17 Storm Water (Pump Station) EA $250,000.00 2 $500,000.00
18 Catch Basins (Type"F") Storm Water EA $2,200.00 8 $17,600.00
19 Storm Water Appurtenances EA $2,500.00 4 $10,000.00
20 Storm Pipe C900 (24" Diameter) LF $350.00 500 $175,000.00
21 Storm Pipe C900 (15" Diameter) LF $250.00 240 $60,000.00
22 Center & East Column Foundation
(Demo/Reconstruction/Shoring of
slab/dewatering during construction) EA $60,000.00 2 $120,000.00
23 MOT (barricades on Collins Ave,
signage and pavement markings) LS $220,000.00 1 $220,000.00
24 Contingency 10% $216,777.41
Total Cost of Construction $2,767,510.55
251 ~~gineenng/surveYing/DraWingSI
inspections/perimts( 15%) $415,126.58
Total
Total Cost of Project approximately
Note: People's gas, Bellsouth not included in this estimate
Date: 10/08/02
fly over 63rd st500c (2.5f 3m+)
$3,182,637.13
$3.2 Millions
, .
City of Miami Beach
Public Works Department
Proiect: Cost estimate for lowering existing roadway by 4.5 feet at North and South of 63rd street Fly Over.
(Vertical Clearance 16'-0" as per FDOT requirement).
DESCRIPTION UNIT UNIT PRICE QUANTITY AMOUNT
A Materials and equipments
1 Mobilization LS $198,163.24 1 $198,163.24
2 Regular excavation CY $12.00 16,558 $198,697
3 Stabilized subgrade (12") SY $5.00 11,039 $55,193.68
4 Limerock base (8" thick) SY $12.00 11,039 $132,464.84
5 Asphaltic concrete (2" thick) SY $4.00 9,631 $38,525.71
6 Median Concrete Curb (6") LF $12.00 700 $8,400.00
7 Curb and Gutter (24") LF $20.00 1,818 $36,351.00
8 Sidewalk (4") Sf $7.50 8,972 $67,292.63
9 Light poles EA $2,800.00 6 $16,800.00
10 Traffic Signal EA $80,000.00 1 $80,000.00
11 Retaining wall (8" thick) 4 comers LF $550.00 890 $489,500.00
12 Water Main (12" diam pipe) LF $350.00 400 $140,000.00
13 Water Main (10" diam pipe) LF $285.00 350 $99,750.00
14 Fire Hydrant EA $990.00 2 $1,980.00
15 Sanitary Sewer pipe LF $250.00 640 $160,000.00
16 Sanitary Sewer Pump LS $200.00 1 $200.00
17 Storm Water (Pump Station) EA $250,000.00 2 $500,000.00
18 Catch Basins (Type"F") Storm Water EA $2,200.00 8 $17,600.00
19 Storm Water Appurtenances EA $2,500.00 4 $10,000.00
20 Storm Pipe C900 (24" Diameter) LF $350.00 500 $175,000.00
21 Storm Pipe C900 (15" Diameter) LF $250.00 240 $60,000.00
21 Center & East Column Foundation
(Demo/Reconstruction/Shoring of
slab/dewatering during construction) EA $60,000.00 2 $120,000.00
22 8" Reinforced Concrete
Slab/Grannular base SF $15.00 15,000 $225,000.00
23 MOT (barricades on Collins Ave,
signage and pavement markings) LS $220,000.00 1 $220,000.00
Contingency 10% $240,775.51
24 Total Cost of Construction $3,291,693.87
Engineering/surveying/Drawings/
inspections/perimts( 15%) $493,754.08
Total
Total Cost of Project approximately
Note: People's gas, Bellsouth not included in this estimate
$3,785,447.95
$3.8 Millions
Date: 10/08/02
flyover63rdst500c(4.5f me-curb)