The document compares preliminary construction cost estimates for a South Corridor project from DTPW and AECOM. Key differences include DTPW using lower contingency percentages (5-10%) while AECOM uses higher percentages (30-10%), AECOM assuming a need for more vehicles at a higher unit cost, and AECOM allocating a larger percentage to professional services. The main cost differences stem from the contingencies chosen, vehicle assumptions, and professional services allocations used in the estimates.

1. South Corridor
Preliminary Construction Cost Estimates Comparison
Presented by Alice N. Bravo, P.E., Director
June 04, 2018
Miami-Dade County | Department of Transportation & Public Works

2. AECOM (Preliminary):
• The estimate was prepared using 2017 costs and a “top down” approach to identify costs based on similar
projects. The referenced projects used include:
• SunRail Phase 2 South Contractors Schedule of Values
• Go Triangle - Durham-Orange Light Rail Transit
• AECOM - SunRail Phase 2 South Engineers Estimate
• Other projects as indicated in the estimate line items
Basis of Conceptual Estimates
DTPW (Preliminary):
• Conceptual Construction cost estimates are based on 2016 costs. 2017 costs will be higher based on inflation,
it is anticipated that the escalation rate can be 3% per year
• Used detailed FTA Standard Cost Categories, not generic per mile costs :
- FDOT State Average Costs (2016)
- Bid Unit Prices and Actual Contract costs of the Airport Link extension opened in 2012 with escalation to
2016$
• Used comparative data obtained from contractors who performed independent conceptual estimates
• Some unit costs provided by AECOM SMART Plan report November 2016

3. SOUTH CORRIDOR
PRELIMINARY ESTIMATES
(A)
DTPW
SOUTH CORRIDOR
(B)
AECOM
SOUTH CORRIDOR
FTA
CATEGORY
No.
DESCRIPTION
2016 BASE YEAR
COST W/O
CONTINGENCY
2016
ALLOCATED &
UNALLOCATED
CONTINGENCY
2016 ESTIMATE
WITH
CONTINGENCY
2017 BASE YEAR
COST W/O
CONTINGENCY
2017 ALLOCATED
& UNALLOCATED
CONTINGENCY
2017 ESTIMATE
WITH
CONTINGENCY
10 GUIDEWAY AND TRACK ELEMENTS $105,068,450 $5,253,423 5% $110,321,873 $108,098,325 $32,429,498 30% $140,527,823
20
STATIONS, STOPS, TERMINALS,
INTERMODALS $47,000,000 $2,350,000 5% $49,350,000 $51,240,000 $15,372,000 30% $66,612,000
30
SUPPORT FACILITIES: YARDS, SHOPS,
ADMIN BLDGS $4,000,000 $200,000 5% $4,200,000 $2,986,940 $896,082 30% $3,883,022
40 SITEWORK & SPECIAL CONDITIONS $161,038,333 $8,051,917 5% $169,090,250 $203,415,113 $61,024,534 30% $264,439,647
50 SYSTEMS $188,110,500 $9,405,525 5% $197,516,025 $214,572,653 $64,371,796 30% $278,944,449
CONSTRUCTION SUBTOTAL (10-50) $505,217,283 $25,260,864 5% $530,478,148 $580,313,031 $174,093,909 30% $754,406,940
60
RIGHT-OF-WAY, LAND, EXISTING
IMPROVEMENTS $25,000,000 $0 0% $25,000,000 $10,000,000 $0 0% $10,000,000
70
VEHICLES (FROM RECOMMENDED SERVICE
PLAN BELOW) $80,000,000 $0 0% $80,000,000 $279,972,000 $27,997,200 10% $307,969,200
80 PROFESSIONAL SERVICES* $55,573,901 $2,778,695 5% $58,352,596 $166,389,214 $16,638,921 10% $183,028,135
SUBTOTAL (SUM CATEGORIES 10-80) $665,791,185 $28,039,559 $693,830,744 $1,036,674,245 $218,730,031 21% $1,255,404,276
90
UNALLOCATED CONTINGENCY (% of Const.
Cost w/ Contingency) $26,523,907 5% $26,523,907 $58,031,303 10% $58,031,303
(FOR AECOM % of Const. Cost only)
SUBTOTAL (SUM CATEGORIES 10-90) $665,791,185 $54,563,467 $720,354,651 $1,036,674,245 $276,761,334 $1,313,435,579
100 FINANCE CHARGES $0 $0 $0 $0
TOTAL $666,000,000 $55,000,000 $720,000,000 $1,037,000,000 $277,000,000 $1,313,000,000

4. TOTAL PROJECT COST DIFFERENCE
PRELIMINARY ESTIMATES
(A)
DTPW
SOUTH CORRIDOR
(B)
AECOM
SOUTH CORRIDOR DIFFERENCE
(B - A)
FTA
CATEGORY
No.
DESCRIPTION 2016 COSTS 2017 COSTS
10 - 50 CONSTRUCTION COST $505,217,283 $580,313,031 $75,095,748
60 RIGHT-OF-WAY, LAND, EXISTING IMPROVEMENTS $25,000,000 $10,000,000 -$15,000,000
70 VEHICLES $80,000,000 $279,972,000 $199,972,000
80 PROFESSIONAL SERVICES $55,573,901 $166,389,214 $110,815,313
90 UNALLOCATED CONTINGENCY $26,523,907 $58,031,303 $31,507,396
ALLOCATED CONTINGENCY $28,039,559 $218,730,031 $190,690,471
TOTAL $720,354,651 $1,313,435,579 $593,080,928

5. PRELIMINARY ESTIMATES
(A)
DTPW
SOUTH CORRIDOR
(B)
AECOM
SOUTH CORRIDOR DIFFERENCE
(B - A)
FTA
CATEGORY
No.
DESCRIPTION 2016 COSTS 2017 COSTS
10 - 50 CONSTRUCTION COST $505,217,283 $580,313,031 $75,095,748
CATEGORY COST DIFFERENCE
$15M is due to inflation difference between 2016 and 2017, $60M or approximately
10% is the remainder of the total which is reasonable for two (2) independent
estimates; particularly when performed during the planning phase.

6. CATEGORY COST DIFFERENCE
DTPW assumes acquiring land for new park-&-ride facilities. The proposed light
maintenance facility and vehicle staging area at the south end is assumed to fit
within bus terminal station area at Florida City.
AECOM assumes no new park-&-ride facilities; however, estimates additional land is
needed for a light maintenance facility and vehicle staging area at the south end.
PRELIMINARY ESTIMATES
(A)
DTPW
SOUTH CORRIDOR
(B)
AECOM
SOUTH CORRIDOR DIFFERENCE
(B - A)
FTA
CATEGORY
No.
DESCRIPTION 2016 COSTS 2017 COSTS
60 RIGHT-OF-WAY, LAND, EXISTING IMPROVEMENTS $25,000,000 $10,000,000 -$15,000,000

7. CATEGORY COST DIFFERENCE
Operational plan for South Corridor requires 72 Metrorail vehicles.
DTPW assumes 32 new vehicles at $2.5M per unit and 40 vehicles from the new
replacement fleet. DTPW estimates the cost from the recent Metrorail Car Replacement
Contract.
AECOM assumes 72 new vehicles at approximately $4.0M per car.
PRELIMINARY ESTIMATES
(A)
DTPW
SOUTH CORRIDOR
(B)
AECOM
SOUTH CORRIDOR DIFFERENCE
(B - A)
FTA
CATEGORY
No.
DESCRIPTION 2016 COSTS 2017 COSTS
70 VEHICLES $80,000,000 $279,972,000 $199,972,000

8. CATEGORY COST DIFFERENCE
DTPW at 11% of construction cost (based on previous County transit projects).
AECOM at 29% of construction cost
PRELIMINARY ESTIMATES
(A)
DTPW
SOUTH CORRIDOR
(B)
AECOM
SOUTH CORRIDOR DIFFERENCE
(B - A)
FTA
CATEGORY
No.
DESCRIPTION 2016 COSTS 2017 COSTS
80 PROFESSIONAL SERVICES $55,573,901 $166,389,214 $110,815,313

9. CATEGORY COST DIFFERENCE
DTPW uses 5% (County Ordinance for new projects).
AECOM uses 10%
PRELIMINARY ESTIMATES
(A)
DTPW
SOUTH CORRIDOR
(B)
AECOM
SOUTH CORRIDOR DIFFERENCE
(B - A)
FTA
CATEGORY
No.
DESCRIPTION 2016 COSTS 2017 COSTS
90 UNALLOCATED CONTINGENCY $26,523,907 $58,031,303 $31,507,396

10. CATEGORY COST DIFFERENCE
DTPW assumes 5% on categories 10 – 50 and 80.
AECOM assumes 30% on categories 10 - 50 and 10% on categories 70 - 80
PRELIMINARY ESTIMATES
(A)
DTPW
SOUTH CORRIDOR
(B)
AECOM
SOUTH CORRIDOR DIFFERENCE
(B - A)
FTA
CATEGORY
No.
DESCRIPTION 2016 COSTS 2017 COSTS
ALLOCATED CONTINGENCY $28,039,559 $218,730,031 $190,690,471

11. CONCLUSIONS
VEHICLES
$200M
IT CAN BE CONCLUDED THAT THE MAIN
DIFFERENCES BETWEEN THE DTPW AND THE
AECOM ESTIMATES ARE RELATED TO THE
CONTIGENCIES CHOSEN, THE VEHICLE NUMBER
AND THEIR UNIT COST AND THE PROFESSIONAL
SERVICES ALLOCATION PERCENTAGE CHOSEN
HARD COSTS
$75M
RIGHT-OF-WAY
-$15M
PROFESSIONAL
SERVICES
$111M
UNALLOCATED
CONTINGENCY
$191M
ALLOCATED
CONTINGENCY
$31M
DIFFERENCES

12. SUMMARY
DTPW 5% and AECOM 30% on Category 10-50 and 10% on Category 60-80