Section 4120 _ Revised 10_21_2025.pdf
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- Solicitation number
- 645-RFB-2382-2026
- Issued by
- Jasper County, Iowa
About this file
This is a specification document and competitive solicitation for the Iowa Department of Transportation District 1 Rock to Road shoulder aggregate contract. The procurement requires the delivery and placement of Class A crushed stone aggregate across eight maintenance garage areas in Newton, Altoona, Jefferson, Grinnell, Boone, Marshalltown, Tama, and Malcom. The total project involves approximately 16,610 tons of Class A stone distributed across multiple locations, with individual line items ranging from 800 to 3,000 tons. Material must be delivered between 7:30 AM and 3:30 PM on normal working days and within ten working days of order placement. The contract commences upon execution and terminates on December 31, 2026, with no renewal options. A pre-bid meeting is scheduled for January 20, 2026, at 2:30 PM CST via Microsoft Teams, with a final bid submission deadline of February 10, 2026, at 1:00 PM CST.
Bidders must submit pricing per ton that includes rock, delivery, and spreading services. The contract employs a Net 60 payment term with 0% discount, and the Iowa DOT is tax-exempt. Evaluation criteria include cost, staffing, time schedule compliance, past work performance, and work capacity. No specific set-aside designations for disadvantaged enterprises were mentioned. The contract specifications require Class A crushed stone meeting Gradation No. 11 standards with maximum abrasion limits of 45 percent and C freeze limits of 15 percent, along with clay lumps and friable particles not exceeding 4.0 percent. The Iowa Department of Transportation reserves the right to select delivery points and tonnage amounts awarded to individual bidders. If a successful bidder fails to deliver within twenty days, the agency retains the right to procure materials from an alternate source. All questions must be directed to Matthew Barker at matthew.barker@iowadot.us or 515-239-1173 through the Q&A Board.
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Other files
| File | Type | Posted |
|---|---|---|
| Scope of Work REVISED.pdf | ||
| Aggregate+Gradation+Table (1).pdf | ||
| 1360063-event.pdf | ||
| DistrictMapD1 (15)_Redacted.pdf |
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Text version
Section 4120. Granular Surfacing and Granular Shoulder Aggregate
4120.01 DESCRIPTION.
Uniform mixture of fine and coarse particles of crushed stone, gravel, or a combination of these materials with sand. Crushed recycled materials are to total no more than:
· 30% of the shoulder aggregate for new construction.
· 50% of the total for existing granular shoulders.
4120.02 GRANULAR MATERIAL.
A. Granular Surfacing.
Furnish material meeting the requirements of Article 4120.04, or when specified in the contract documents, meet the requirements of Article 4120.03, 4120.05, or 4120.06.
B. Granular Shoulders.
1. Furnish material meeting the requirements of Article 4120.04 or recycled materials. When specified in the contract documents, meet the requirements of Article 4120.05 or 4120.06. For recycled materials, meet the following requirements:
· Recycle PCC, RAP, or composite pavements to meet the requirements of Materials I.M. 210.
· Crush PCC or composite pavement to meet the requirements for Gradation No. 11 of the Aggregate Gradation Table, Article 4109.02.
· Process RAP to pass the 1.5 inch sieve.
2. The contract documents may allow a Class C gravel and crushed aggregate mixture for granular shoulders meeting the following:
· 30% to 50% crushed stone meeting soundness and abrasion requirements of Article 4120.05. Meet the requirements for Gradation No. 10 of the Aggregate Gradation Table, Article 4109.02 with the exception of 8% to 16% passing the No. 200 sieve.
· 30% to 50% recycled crushed PCC or composite materials meeting the above requirements for Granular Shoulders. Meet the requirements for Gradation No. 10 of the Aggregate Gradation Table, Article 4109.02 with the exception of 8% to 16% passing the No. 200 sieve.
· 30% to 50% RAP processed to pass the 1.5 inch sieve.
4120.03 CLASS C GRAVEL.
Meet the requirements for gradation No. 10 of the Aggregate Gradation Table, Article 4109.02 and Table 4120.03-1:
Table 4120.03-1: Coarse Aggregate Quality (Class C Gravel)
Coarse Aggregate Quality Maximum Percent Allowed Test Method
C Freeze 15 Iowa DOT Materials Laboratory Test Method No. 211, Method C
Shale (+ No. 4 sieve) 10 Materials I.M. 372
Total of Clay Lumps and Friable Particles, plus % passing No.
200 sieve
15 Materials I.M.s 368 and 306
Total of Shale, Clay lumps and friable particles, plus % passing.
No. 200 sieve
20 Materials I.M.s 372, 368, and 306
4120.04 CLASS A CRUSHED STONE.
Meet the requirements for Gradation No. 11 of the Aggregate Gradation Table, Article 4109.02 and Table 4120.04-1:
10/23/25, 10:33 AM Section 4120 | Revised 10/21/2025 https://ia.iowadot.gov/erl/current/GS/content/4120.htm 1/2 https://ia.iowadot.gov/erl/current/GS/IM/content/210.htm https://ia.iowadot.gov/erl/current/GS/GS/content/4109.htm#Section410902 https://ia.iowadot.gov/erl/current/GS/GS/content/4109.htm#Section410902 https://ia.iowadot.gov/erl/current/GS/GS/content/4109.htm#Section410902 https://ia.iowadot.gov/erl/current/GS/GS/content/4109.htm#Section410902 https://ia.iowadot.gov/erl/current/GS/IM/content/372.htm https://ia.iowadot.gov/erl/current/GS/IM/content/368.htm https://ia.iowadot.gov/erl/current/GS/IM/content/306.htm https://ia.iowadot.gov/erl/current/GS/IM/content/372.htm https://ia.iowadot.gov/erl/current/GS/IM/content/368.htm https://ia.iowadot.gov/erl/current/GS/IM/content/306.htm https://ia.iowadot.gov/erl/current/GS/GS/content/4109.htm#Section410902
Table 4120.04-1: Coarse Aggregate Quality (Class A Crushed Stone)
Allowed Test Method
Abrasion 45 AASHTO T 96
C Freeze 15 Iowa DOT Materials Laboratory Test Method No. 211, Method C
Clay Lumps and Friable Particles 4.0 Materials I.M. 368
Note: For Granular Shoulder Aggregate only, the abrasion limit is 50.
4120.05 CLASS B CRUSHED STONE.
Meet the requirements for Gradation No. 11 of the Aggregate Gradation Table, Article 4109.02 and Table 4120.05-1:
Table 4120.05-1: Coarse Aggregate Quality (Class B Crushed Stone)
Allowed Test Method
Abrasion 55 AASHTO T 96
C Freeze 20 Iowa DOT Materials Laboratory Test Method No. 211, Method C
Total of Abrasion & C Freeze 65
Clay Lumps and Friable Particles 4 Materials I.M. 368
4120.06 CLASS D CRUSHED STONE.
Refer to the contract documents for gradation and quality requirements.
4120.07 AGGREGATE FOR PAVED SHOULDER FILLETS.
Crushed stone or recycled materials meeting the requirements for Gradation No. 11 of the Aggregate Gradation Table, Article 4109.02, and meeting the quality requirement of Article
4120.04. For recycled materials, meet the requirements of Article 4120.02, B.
10/23/25, 10:33 AM Section 4120 | Revised 10/21/2025 https://ia.iowadot.gov/erl/current/GS/content/4120.htm 2/2 https://ia.iowadot.gov/erl/current/GS/IM/content/368.htm https://ia.iowadot.gov/erl/current/GS/GS/content/4109.htm#Section410902 https://ia.iowadot.gov/erl/current/GS/IM/content/368.htm https://ia.iowadot.gov/erl/current/GS/GS/content/4109.htm#Section410902
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