Indiana Department of Transportation SEP 14 Report Alternate Pavement Type
Appendix C SR 25 (IR-30840)
Seven (7) Contractors participated in the bidding (7 PCCP options and 5 HMA options were bid) and all bids were below the engineer's estimate. Five (5) Contractors participated in both pavement type pay options.
INDOT provided the following pavement design thickness for mainline of this project:
- 10 inches of PCCP or
- 13.5 inches of HMA
Bid Analysis Summary
| Bidders | Initial Bid | PW Cost for PCCP | Bid Analysis | ||
|---|---|---|---|---|---|
| A | $26,695,938.17 | + | $2,108,515.00 | = | $28,804,453.17 |
| B | $26,950,326.93 | + | $2,108,515.00 | = | $29,058,841.93 |
| C | $26,994,088.85 | + | $2,108,515.00 | = | $29,102,603.85 |
| D | $28,217,279.05 | + | $2,108,515.00 | = | $30,325,794.05 |
| E | $28,372,604.40 | + | $2,108,515.00 | = | $30,481,119.40 |
| F | $30,007,418.05 | + | $2,108,515.00 | = | $32,115,933.05 |
| G | $30,827,332.05 | + | $2,108,515.00 | = | $32,935,847.05 |
| Bidders | Initial Bid | PW Cost for HMA | Bid Analysis | ||
|---|---|---|---|---|---|
| B | $27,605,987.05 | + | $3,449,253.00 | = | $31,055,240.05 |
| A | $27,671,360.16 | + | $3,449,253.00 | = | $31,120,613.16 |
| C | $27,876,127.63 | + | $3,449,253.00 | = | $31,325,380.63 |
| F | $28,191,983.79 | + | $3,449,253.00 | = | $31,641,236.79 |
| D | $29,117,275.82 | + | $3,449,253.00 | = | $32,566,528.82 |
The low bid amount, out of all 7 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. Shoulders and "S" Lines are to be HMA.
| 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 IN. | 199,445 yd2 | $28.58 | $23.66 | $22.99 - $26.00* | $24.40 | PCCP |
| Subbase for PCCP | 51,490 yd3 | $30.59 | $26.00 | $26.00 - $52.00* | $34.45 | PCCP |
| D-1 Contraction Joint | 97,990 ft | $8.64 | $8.48 | $7.64 - $15.00* | $9.39 | PCCP |
| QC/QA-HMA, 4, 70, Surface | 18,179 TON | $70.50 | $67.97 | $66.50 - $71.95 | $67.88 | HMA |
| QC/QA-HMA, 4, 70, Intermediate | 30,340 TON | $49.40 | $52.12 | $48.43 - $52.12 | $50.71 | HMA |
| QC/QA-HMA, 4, 64, Base | 48,570 TON | $48.10 | $49.57 | $48.39 - $49.57 | $48.69 | HMA |
| QC/QA-HMA, 5, 76, Intermediate, OG | 31,370 TON | $54.20 | $45.99 | $45.00 - $47.44 | $45.68 | HMA |
* Bidder F was significantly and consistently higher on all the PCCP option items.
The above table shows that pavement item bids on PCCP are consistently lower than the estimates used in evaluation, overall the HMA items were lower than the estimates with only a few HMA items higher. This indicates that a true cost savings 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.
| 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 |
|---|---|---|---|---|---|
| QC/QA-HMA, 2, 64, Surface | 2,119 TON | $64.00 | $64.00 - $67.20 | $65.37 | PCCP |
| QC/QA-HMA, 2, 64, Surface | 1,855 TON | $65.92 | $64.50 - $65.92 | $65.00 | HMA |
| QC/QA-HMA, 2, 64, Intermediate | 3,375 TON | $52.00 | $52.00 - $56.21 | $54.46 | PCCP |
| QC/QA-HMA, 2, 64, Intermediate | 12,410 TON | $55.19 | $52.39 - $55.19 | $53.92 | HMA |
| QC/QA-HMA, 2, 64, Base | 7,617 TON | $52.00 | $52.00 - $54.48 | $52.51 | PCCP |
| QC/QA-HMA, 2, 64, Base | 7,617 TON | $53.15 | $52.00 - $53.16 | $52.46 | HMA |
Conclusion
INDOT saved the tax payers approximately $866,508.88 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 $2,207,246.88 over the 50 year service life of the pavement. These savings include the reduction of INDOT's consultant cost of $43,540.00 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 SR 25 (IR-30840)
PW of HMA Option = $3,449,253.00
PW of PCCP Option = $2,108,515.00
| Age in Years | Rehab. | Cost $ | Present Worth Cost $ |
|---|---|---|---|
| 3 | Joint Seal | 182,952.00 | $162,643.66 |
| 6 | Joint Seal | 182,952.00 | $144,589.62 |
| 9 | Joint Seal | 182,952.00 | $128,539.65 |
| 12 | Joint Seal | 182,952.00 | $114,271.28 |
| 15 | Joint Seal | 182,952.00 | $101,586.75 |
| 18 | Joint Seal | 182,952.00 | $90,310.25 |
| 20 | Mill and Functional Overlay | 3,995,007.00 | $1,823,269.04 |
| 23 | Joint Seal | 182,952.00 | $74,228.44 |
| 26 | Joint Seal | 182,952.00 | $65,988.82 |
| 29 | Joint Seal | 182,952.00 | $58,663.82 |
| 32 | Joint Seal | 182,952.00 | $52,151.92 |
| 35 | Mill and Resurface | 1,947,871.00 | $493,620.65 |
| 38 | Joint Seal | 182,952.00 | $41,216.42 |
| 41 | Joint Seal | 182,952.00 | $36,641.25 |
| 44 | Joint Seal | 182,952.00 | $32,573.94 |
| 47 | Joint Seal | 182,952.00 | $28,958.11 |
| Total HMA PW Cost $3,449,253.62 | |||
| Age in Years | Rehab. | Cost $ | Present Worth Cost $ |
|---|---|---|---|
| 8 | Reseal the Joint | 176,176.00 | $128,730.08 |
| 16 | Reseal the Joint | 176,176.00 | $94,061.81 |
| 24 | Reseal the Joint | 176,176.00 | $68,730.04 |
| 30 | Mill and Functional Overlay | 4,022,890.00 | $1,240,332.09 |
| 33 | Joint Seal | 182,952.00 | $50,146.08 |
| 36 | Joint Seal | 182,952.00 | $44,579.68 |
| 39 | Joint Seal | 182,952.00 | $39,631.17 |
| 42 | Mill and Resurface | 1,989,558.00 | $383,138.99 |
| 45 | Joint Seal | 182,952.00 | $31,321.09 |
| 48 | Joint Seal | 182,952.00 | $27,844.34 |
| Total PCCP PW Cost $2,108,515.36 | |||
PW = F [1/(1+i)n]
Where: F = Future Construction Cost
i = Discount rate (4%)
n = Number of years from year zero
| Total Cost | Alternative 1: 10 inches PCCP | Alternative 2: 13.5 inches HMA | ||
|---|---|---|---|---|
| Agency Cost ($1000) | User Cost ($1000) | Agency Cost ($1000) | User Cost ($1000) | |
| Undiscounted Sum | $7,455.74 | $0.00 | $8,504.21 | $0.00 |
| Present Value | $2,108.52 | $0.00 | $3,449.25 | $0.00 |
| EUAC | $98.15 | $0.00 | $160.56 | $0.00 |
| Lowest Present Value Agency Cost | Alternative 1: 10 inches PCCP | |||
| Lowest Present Value User Cost | Alternative 1: 10 inches PCCP | |||
| Year | Alternative 1: 10 inches PCCP | Alternative 2: 13.5 inches HMA | ||
|---|---|---|---|---|
| Agency Cost ($1000) | User Cost ($1000) | Agency Cost ($1000) | User Cost ($1000) | |
| 0 | ||||
| 1 | ||||
| 2 | ||||
| 3 | $182.95 | |||
| 4 | ||||
| 5 | ||||
| 6 | $182.95 | |||
| 7 | ||||
| 8 | $176.18 | |||
| 9 | $182.95 | |||
| 10 | ||||
| 11 | ||||
| 12 | $182.95 | |||
| 13 | ||||
| 14 | ||||
| 15 | $182.95 | |||
| 16 | $176.18 | |||
| 17 | ||||
| 18 | $182.95 | |||
| 19 | ||||
| 20 | $3,995.01 | |||
| 21 | ||||
| 22 | ||||
| 23 | $182.95 | |||
| 24 | $176.18 | |||
| 25 | ||||
| 26 | $182.95 | |||
| 27 | ||||
| 28 | ||||
| 29 | $182.95 | |||
| 30 | $4,022.89 | |||
| 31 | ||||
| 32 | $182.95 | |||
| 33 | $182.95 | |||
| 34 | ||||
| 35 | $1,947.87 | |||
| 36 | $182.95 | |||
| 37 | ||||
| 38 | $182.95 | |||
| 39 | $182.95 | |||
| 40 | ||||
| 41 | $182.95 | |||
| 42 | $1,989.56 | |||
| 43 | ||||
| 44 | $182.95 | |||
| 45 | $182.95 | |||
| 46 | ||||
| 47 | $182.95 | |||
| 48 | $182.95 | |||
| 49 | ||||
| 50 | ||||