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Indiana Department of Transportation SEP 14 Report Alternate Pavement Type

Appendix F US 24 (IR-30162)

Seven (7) Contractors participated in the bidding (6 PCCP options and 4 HMA options were bid) and all bids were below the engineer's estimate. Three (3) Contractors participated in both pavement type pay options.

INDOT provided the following pavement design thickness for mainline of this project:

  1. 10.5 inches of PCCP or
  2. 13.5 inches of HMA.

Bid Analysis Summary

PCCP Pay Items Option
Bidders Initial Bid PW Cost for PCCP Bid Analysis
A $16,452,359.85 + $919,579.74 = $17,371,939.59
B $16,596,965.57 + $919,579.74 = $17,516,545.31
C $16,843,565.39 + $919,579.74 = $17,763,145.13
D $16,883,604.60 + $919,579.74 = $17,803,184.34
E $17,046,415.82 + $919,579.74 = $17,965,995.56
F $17,126,951.39 + $919,579.74 = $18,046,531.13
HMA Pay Item Option
Bidders Initial Bid PW Cost for HMA Bid Analysis
A $16,020,393.08 + $1,475,368.14 = $17,495,766.22
D $16,055,178.49 + $1,475,368.14 = $17,530,546.63
F $16,593,462.83 + $1,475,368.14 = $18,068,830.97
G $17,912,365.98 + $1,475,368.14 = $19,387,734.12

The low bid amount, out of all 7 bids, was for HMA pay items option (Bidder A) and after adding PW cost of HMA and PCCP to the respective pavement type options, PCCP pay items option was the low bid (Bidder A). PCCP pay items option of Bidder A was awarded for this contract. The PW cost factor affected the outcome of the bidding.

INDOT compared the estimated cost with actual low bid costs of both pavement types. The following table shows the cost comparison with low bid of those pavement items that were relative to the mainline pavements and relative to this alternate bid for pavement type. All other items in the bids were common to both types of pavement option.

Cost Comparison of Unique Items
Bid Item Bid Quantities Estimated Cost of Item Per Unit Low Bid Cost of Item Per Unit Range of Bid Costs of Item Per Unit Average Bid Cost of Item Per Unit HMA or PCCP Option
QC/QA PCCP, 10.5 IN. 79,893 yd2 $29.21 $24.89 $24.15 - $25.25 $24.82 PCCP
Subbase for PCCP 24,492 yd3 $30.63 $26.63 $23.10 - $27.00 $25.55 PCCP
D-1 Contraction Joint 40,522 ft $8.65 $8.65 $8.00 - $9.64 $8.82 PCCP
QC/QA-HMA, 4, 70, Surface 7,503 TON $70.50 $66.00 $50.70 - $66.0 $54.52 HMA
QC/QA-HMA, 4, 70, Intermediate 12,600 TON $49.40 $53.00 $38.00 - $53.00 $41.75 HMA
QC/QA-HMA, 4, 64, Base, 25.0mm 20,412 TON $48.10 $51.00 $35.00 - $51.00 $39.00 HMA
QC/QA-HMA, 4, 64, Base, 19.0mm 14,739 TON $48.10 $51.00 $35.40 - $51.00 $39.30 HMA
QC/QA-HMA, 5, 76, Intermediate, OG 12,788 TON $54.00 $51.00 $44.05 - $51.00 $45.78 HMA

The above table shows that pavement item bids are all lower than or equal to the estimates used in evaluation, but on HMA the majority of the items are higher than the estimates. This indicates that a true cost saving was realized by INDOT in this process.

The table below compares some common HMA items found in both PCCP and HMA options to check for unbalanced bids. These bids appear to be consistent and no anomalies were found.

Cost Comparison of Some Common Items Used in Both PCCP and HMA
Bid Item Bid Quantities Low Bid Cost of Item Per Unit Range of Bid Costs of Item Per Unit Average Bid Cost of Item Per Unit HMA or PCCP Bid
HMA Surface, Type B 428 TON $47.00 $47.00 - $60.00 $53.67 PCCP
HMA Surface, Type B 428 TON $47.00 $47.00 - $55.00 $53.00 HMA
HMA Intermediate, Type B 925 TON $47.00 $47.00 - $60.00 $53.67 PCCP
HMA Intermediate, Type B 925 TON $47.00 $47.00 - $60.00 $53.00 HMA

Conclusion

INDOT did not realize a saving immediately, at the bid opening, (HMA Low Bid - PCCP Low Bid = -$439,966.77). However after using the Bid Analysis amounts (after PW costs applied), INDOT saved the tax payers approximately $115,826.63 over the 50 year service life of the pavement. These savings include the reduction of INDOT's in-house cost of approximately $8,000.00 for approximately 80 hours of additional time spend by designer to developed two typical section sheets, design work, quantity calculation, and two cost estimates. The time spend by INDOT Contract Section were determined negligible.

The PW cost for future maintenance did impact the bids and which contractor received the contract. INDOT believes using this process of alternate bids for pavement type selection on this project was very successful.

PW of Future Maintenance of the Pavement IR-30162 (US 24)

PW of HMA Option = $1,475,368.14

PW of PCCP Option = $919,579.74

HMA PW for Future Rehabilitation Work
Age in Years Rehab. Cost $ Present Worth Cost $
3 Joint Seal 77,968.00 $69,313.27
6 Joint Seal 77,968.00 $61,619.24
9 Joint Seal 77,968.00 $54,779.28
12 Joint Seal 77,968.00 $48,698.58
15 Joint Seal 77,968.00 $43,292.86
18 Joint Seal 77,968.00 $38,487.20
20 Mill and Functional Overlay 1,715,050.00 $782,726.43
23 Joint Seal 77,968.00 $31,633.67
26 Joint Seal 77,968.00 $28,122.22
29 Joint Seal 77,968.00 $25,000.55
32 Joint Seal 77,968.00 $22,225.40
35 Mill and Resurface 828,940.00 $210,066.22
38 Joint Seal 77,968.00 $17,565.05
41 Joint Seal 77,968.00 $15,615.27
44 Joint Seal 77,968.00 $13,881.92
47 Joint Seal 77,968.00 $12,340.97
PCCP PW for Future Rehabilitation Work
Age in Years Rehab. Cost $ Present Worth Cost $
8 Reseal the Joint 83,937.00 $61,331.94
16 Reseal the Joint 83,937.00 $44,814.65
24 Reseal the Joint 83,937.00 $32,745.63
30 Mill and Functional Overlay 1,734,427.00 $534,756.22
33 Joint Seal 77,968.00 $21,370.57
36 Joint Seal 77,968.00 $18,998.36
39 Joint Seal 77,968.00 $16,889.48
42 Mill and Resurface 848,805.00 $163,458.56
45 Joint Seal 77,968.00 $13,348.00
48 Joint Seal 77,968.00 $11,866.32

PW = F [1/(1+i)n]

Where: F = Future Construction Cost
i = Discount rate (4%)
n = Number of years from year zero

Total Cost
Total Cost Alternative 1: 10.5 inches PCCP Alternative 2: 13.5 inches HMA
Agency Cost ($1000) User Cost ($1000) Agency Cost ($1000) User Cost ($1000)
Undiscounted Sum $3,224.88 $0.00 $3,635.54 $0.00
Present Value $919.58 $0.00 $1,475.37 $0.00
EUAC $42.81 $0.00 $68.68 $0.00
Lowest Present Value Agency Cost Alternative 1: 10.5 inches PCCP
Lowest Present Value User Cost Alternative 1: 10.5 inches PCCP
Expenditure Stream
Year Alternative 1: 10.5 inches PCCP Alternative 2: 13.5 inches HMA
Agency Cost ($1000) User Cost ($1000) Agency Cost ($1000) User Cost ($1000)
0
1
2
3 $77.97
4
5
6 $77.97
7
8 $83.94
9 $77.97
10
11
12 $77.97
13
14
15 $77.97
16 $83.94
17
18 $77.97
19
20 $1,715.05
21
22
23 $77.97
24 $83.94
25
26 $77.97
27
28
29 $77.97
30 $1,734.43
31
32 $77.97
33 $77.97
34
35 $828.94
36 $77.97
37
38 $77.97
39 $77.97
40
41 $77.97
42 $848.80
43
44 $77.97
45 $77.97
46
47 $77.97
48 $77.97
49
50

Contact

Jerry Yakowenko
Office of Program Administration
202-366-1562
E-mail Jerry

 
 
Updated: 07/27/2011
 

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