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Gbf project spotlight on sr-93-i-75 alligator alley
1. SPOTLIGHT ON SR-93/I-75 ALLIGATOR
ALLEY
In 2011, GBF was awarded an FTBA Best in Construction Award in the "Alternative
Contracting" Category for the CEI services provided along I-75 in Broward County. This 17.2M
project was completed 9.4% under budget in July, 2010.
Project Overview
Located along SR-93/I-75 from MP 35.0 to a point west of SR-25/US-27 (MP 18.870), this
project entailed the inside shoulder widening of Alligator Alley. The scope of work included
resurfacing, restoration, rehabilitation, signing and pavement markings, landscaping as well as
expansion joint replacement on 22 bridges. This is the preferred thoroughfare for all motorists in
South Florida to travel from coast to coast. It is an extremely active, tolled facility that is well
traveled every day of the week.
The Project Had Some Unusual Features
The most impressive construction operation was the resurfacing of the mainline lanes. Even in
this remote location, the contractor was able to place 3.8 miles using over 1,600 tons of asphalt
in a single day. The contractor averaged two and a half miles and 1,400 tons of asphalt per day.
This production rate was maintained throughout the thirty-two miles of asphalt placed (sixteen
miles in each direction). In addition, the maintenance of traffic during the paving operations was
executed without incident, with limited disruption to the traveling public resulting in no
construction related accidents. Also, two private planes landed safely in the workzone! (not your
typical resurfacing project.)
Innovative Construction Methods Applied
The contractor proposed changing the original designed inside shoulder widening (6ft) pavement
design from Optional Base Group- 4 (4”) Asphalt –Type B-12.5 only and one inch (1”) SP
structural course Traffic Level-C to Optional Base Group-5 (7”) Limerock base and one and half
inch (1.5”) SP structural course Traffic Level-C at no additional cost to the FDOT. This change
eliminated multiple lifts of asphalt base and allowed for increased production with the use of
limerock base. In addition, this modification created a safer workzone by reducing drop-off
conditions. Our client (The Florida Department of Transportation) realized a 50 calendar day
2. credit for implementation of this proposal in addition to receiving an upgrade to the original base
group design.