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Indiana Department of Transportation SEP 14 Report Alternate Pavement Type

Appendix E I-70 (IR-31104)

Six (6) Contractors participated in the bidding (5 PCCP options and 2 HMA options were bid) and all bids were below the engineer's estimate. One (1) Contractor participated in both pavement type pay options.

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

  1. 12 inches of PCCP or
  2. 15.5 inches of HMA

Bid Analysis Summary

PCCP Pay item Options
Bidders Initial Bid PW Cost for PCCP Bid Analysis
A $32,332,908.93 + $3,539,454.84 = $35,872,363.77
B $33,846,852.49 + $3,539,454.84 = $37,386,307.33
C $36,335,804.34 + $3,539,454.84 = $39,875,259.18
D $37,974,271.64 + $3,539,454.84 = $41,513,726.48
E $38,708,192.73 + $3,539,454.84 = $42,247,647.57
HMA Pay item Options
Bidders Initial Bid PW Cost for HMA Bid Analysis
A $33,596,108.42 + $5,094,040.59 = $38,690,149.01
F $36,694,492.07 + $5,094,040.59 = $41,788,532.66

The low bid amount, out of all 6 bids, was for PCCP pay items option (Bidder A) and after adding PW cost of HMA and PCCP to the respective pavement type options, PCCP option was also the low bid (Bidder A). PCCP pay items option of Bidder A was awarded for this contract.

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.

Cost Comparison of Unique Items
Bid Item Bid Quantities Estimate d 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, 12 IN. 408,293 yd2 $31.29 $23.00 $23.00 - $29.38* $26.27 PCCP
Subbase for PCCP 103,293 yd3 $30.63 $26.50 $25.00 - $32.50* $27.63 PCCP
D-1 Contraction Joint 229,667 ft $8.65 $7.95 $6.99 - $8.50* $7.88 PCCP
QC/QA-HMA, 5, 76, Surface 20,457 TON $76.00 $69.75 $69.75 - $80.00 $75.12 HMA
QC/QA-HMA, 5, 76, Intermediate 34,094 TON $58.60 $48.00 $48.00 - $54.00 $51.00 HMA
QC/QA-HMA, 5, 64, Base 109,102 TON $48.90 $39.00 $39.00 - $44.00 $41.50 HMA
QC/QA-HMA, 5, 76, Intermediate, OG 72,804 TON $54.00 $37.75 $37.75 - $49.00 $43.37 HMA
QC/QA-HMA, 1, 64, Surface 13,277 TON $53.11 $50.00 $50.00 - $63.75 $56.87 HMA
QC/QA-HMA, 1, 64, Intermediate 22,347 TON $50.16 $40.80 $40.80 - $52.80 $46.80 HMA
QC/QA-HMA, 1, 64, Base 73,947 TON $52.36 $37.60 $37.60 - $45.75 $41.67 HMA

* Bidder E was higher on all the PCCP option items among PCCP bidders.

The above table shows that pavement item bids are consistently lower than the estimates used in the evaluation. 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 A 146 TON $97.00 $97.00 - $160.00 $111.92 PCCP
HMA Surface, Type A 146 TON $97.00 $97.00 - $120.00 $108.50 HMA
HMA Intermediate, Type A 439 TON $58.00 $58.00 - $85.00 $64.91 PCCP
HMA Intermediate, Type A 439 TON $58.00 $58.00 - $67.00 $62.50 HMA
HMA for Temp. Pavement 36,624 TON $49.45 $23.95 - $59.00 $46.65 PCCP
HMA for Temp. Pavement 36,624 TON $56.50 $56.50 - $59.00 $57.75 HMA

Conclusion

INDOT saved the tax payers approximately $1,238,199.49 immediately, at the bid opening, (HMA Low Bid - PCCP Low Bid). Using the Bid Analysis amounts (after PW costs applied); INDOT saved the tax payers approximately $2,792,785.24 over the 50 year service life of the pavement. These savings include the reduction of INDOT's consultant cost of $25,000.00 for producing two sets of typical plan sheets and quantities. The inhouse costs for INDOT were determined negligible.

The PW cost for future maintenance did not impact the bid 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-31104 (I-70)

PW of HMA Option = $5,094,040.59 PW of PCCP Option = $3,539,454.84

HMA PW for Future Rehabilitation Work
Age in Years Rehab. Cost $ Present Worth Cost $
3 Joint Seal 245,280.00 $218,053.03
6 Joint Seal 245,280.00 $193,848.35
9 Joint Seal 245,280.00 $172,330.47
12 Joint Seal 245,280.00 $153,201.16
15 Joint Seal 245,280.00 $136,195.28
18 Joint Seal 245,280.00 $121,077.11
20 Mill and Functional Overlay 6,239,162.00 $2,847,472.09
23 Joint Seal 245,280.00 $99,516.56
26 Joint Seal 245,280.00 $88,469.86
29 Joint Seal 245,280.00 $78,649.38
32 Joint Seal 245,280.00 $69,919.01
35 Mill and Resurface 2,874,455.00 $728,431.37
38 Joint Seal 245,280.00 $55,258.01
41 Joint Seal 245,280.00 $49,124.17
44 Joint Seal 245,280.00 $43,671.21
47 Joint Seal 245,280.00 $38,823.55
Total HMA PW Cost $5,094,040.59
PCCP PW for Future Rehabilitation Work
Age in Years Rehab. Cost $ Present Worth Cost $
8 Reseal the Joint 482,300.00 $352,411.89
16 Reseal the Joint 482,300.00 $257,503.91
24 Reseal the Joint 482,300.00 $188,155.59
30 Mill and Functional Overlay 6,215,077.00 $1,916,224.26
33 Joint Seal 245,280.00 $67,229.82
36 Joint Seal 245,280.00 $59,767.06
39 Joint Seal 245,280.00 $53,132.70
42 Mill and Resurface 2,937,598.00 $565,707.73
45 Joint Seal 245,280.00 $41,991.55
48 Joint Seal 245,280.00 $37,330.33
Total PCCP PW Cost $3,539,454.84

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: 12 inches PCCP Alternative 2: 15.5 inches HMA
Agency Cost ($1000) User Cost ($1000) Agency Cost ($1000) User Cost ($1000)
Undiscounted Sum $11,825.97 $0.00 $12,547.54 $0.00
Present Value $3,539.45 $0.00 $5,094.04 $0.00
EUAC $164.76 $0.00 $237.13 $0.00
Lowest Present Value Agency Cost Alternative 1: 12 inches PCCP
Lowest Present Value User Cost Alternative 1: 12 inches PCCP
Expenditure Stream
Year Alternative 1: 12 inches PCCP Alternative 2: 15.5 inches HMA
Agency Cost ($1000) User Cost ($1000) Agency Cost ($1000) User Cost ($1000)
0
1
2
3 $245.28
4
5
6 $245.28
7
8 $482.30
9 $245.28
10
11
12 $245.28
13
14
15 $245.28
16 $482.30
17
18 $245.28
19
20 $6,239.16
21
22
23 $245.28
24 $482.30
25
26 $245.28
27
28
29 $245.28
30 $6,215.08
31
32 $245.28
33 $245.28
34
35 $2,874.46
36 $245.28
37
38 $245.28
39 $245.28
40
41 $245.28
42 $2,937.60
43
44 $245.28
45 $245.28
46
47 $245.28
48 $245.28
49
50

Contact

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

 
 
Updated: 07/27/2011
 

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