32 11 23 - Aggregate Base Courses.pdf
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- Lancaster County, Pennsylvania
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This is a technical specification document for Aggregate Base Courses prepared by Herbert, Rowland & Grubic, Inc., applicable to the Elizabethtown Area Water Authority's Water Main Replacement Project Phase 4 (Contract No. WR-4). The specification details the materials, quality standards, and installation procedures for aggregate subbase and aggregate base courses required for the project, which involves the relocation of approximately 13,860 feet of 4-inch, 6-inch, and 8-inch ductile iron pipe water main with replacement by new 12-inch DIP, replacement of approximately fifteen fire hydrants, and transfer of approximately 180 existing water services. The specification mandates the use of Type C or better No. 2A aggregate subbase in accordance with PennDOT Publication 408 Section 703.2, with AASHTO No. 1 coarse aggregate for repair work. All aggregate materials must originate from PennDOT-approved sources and be furnished from a single source throughout the work. Online bids are due Thursday, August 6, 2026, at 10:00 AM local time, with public bid opening immediately following, and work must be performed in accordance with PennDOT standards and West Donegal Township requirements.
The specification requires contractors to submit materials source names, manufacturer's certificates, and material slips certifying quantities utilized from producers in accordance with PennDOT specifications. Geotextile material (Class 4, Type B conforming to PennDOT Section 212.3) must be provided as an accessory material. Field quality control includes proof-rolling of subgrade with heavy pneumatic-tired equipment to identify soft pockets and areas of excess yielding, with excavation and replacement of unsatisfactory soils as directed by the engineer. Compaction standards reference Section 31 23 23.33 - Flowable Fill, and all tolerances and quality requirements are governed by Section 01 40 00 - Quality Requirements. The project documentation is available through the PennBid website at https://pennbid.bonfirehub.com/, where prospective bidders must register as plan holders to access all official notifications, addenda, and bidding documents.
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Text version
32 11 23 – AGGREGATE BASE COURSES
Herbert, Rowland & Grubic, Inc. 32 11 23 - 1 009280.0426
SECTION 32 11 23 – AGGREGATE BASE COURSES
PART 1 - GENERAL
1.1 SUMMARY
A. Section Includes:
1. Aggregate subbase.
2. Aggregate base course.
B. Related Sections:
1. Section 31 23 33 – Trenching and Backfilling for Utilities.
2. Section 32 12 16 – Asphalt Paving.
3. Section 32 13 13 – Concrete Paving: Finish concrete surface course.
4. Section 32 91 19 – Landscape Grading: Topsoil fill at areas adjacent to aggregate base course.
1.2 REFERENCES
A. Pennsylvania Department of Transportation (PennDOT):
1. Publication 19 – Field and Laboratory Test Methods, latest edition.
2. Publication 408 - Specifications, latest edition, as amended.
B. Commonwealth of Pennsylvania, Pennsylvania Code, Title 67, Transportation, Department of Transportation:
1. Chapter 459, Occupancy of Highways by Utilities, as supplemented or revised.
2. Chapter 213, Work Zone Traffic Control (PennDOT Chapter 213).
C. American Association of State Highway and Transportation Officials:
1. AASHTO M288 - Standard Specification for Geotextile Specification for Highway Applications.
D. ASTM International:
1. ASTM D2922 - Standard Test Method for Density of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth).
Herbert, Rowland & Grubic, Inc. 32 11 23 - 2 009280.0426
2. ASTM D2940 - Standard Specification for Graded Aggregate Material for Bases or Subbases for Highways or Airports.
3. ASTM D3017 - Standard Test Method for Water Content of Soil and Rock in Place by Nuclear Methods (Shallow Depth).
1.3 SUBMITTALS
A. Section 01 33 00 – Submittal Procedures: Requirements for submittals.
B. Materials Source: Submit name of aggregate materials suppliers.
C. Manufacturer's Certificate: Certify Products meet or exceed specified requirements.
D. Material Slips: Furnish certification of the amount of materials utilized from the producer in accordance with PennDOT specifications.
1.4 QUALITY ASSURANCE
A. Furnish each aggregate material from single source throughout the Work.
B. All aggregate must originate from a source approved by PennDOT meeting according to PennDOT standards.
C. Perform Work in accordance with PennDOT and West Donegal Township standard.
PART 2 - PRODUCTS
2.1 AGGREGATE MATERIALS
A. Aggregate Subbase: Type C or better, No. 2A, PennDOT Publication 408 Section 703.2.
B. Aggregate Subbase Repair: AASHTO No. 1, in accordance with PennDOT Publication 408, Section 703.2.
2.2 ACCESSORIES
A. Geotextile: Class 4, Type B, conforming to PennDOT Section 212.3.
PART 3 - EXECUTION
3.1 EXAMINATION
A. Section 01 73 00 – Execution Requirements: Verification of existing conditions before starting work.
B. Verify compacted substrate is dry and ready to support paving and imposed loads.
Herbert, Rowland & Grubic, Inc. 32 11 23 - 3 009280.0426
C. Proof-roll subgrade below pavements with heavy pneumatic-tired equipment to identify soft pockets and areas of excess yielding in accordance with PennDOT Pub. 408, Section
210.3. Do not proof-roll wet or saturated subgrades.
D. Excavate soft spots, unsatisfactory soils, and areas of excessive pumping or rutting, as determined by Engineer, and replace with AASHTO No. 1 coarse aggregate lined with geotextile material or other means as directed by Engineer.
E. Verify substrate has been inspected, gradients and elevations are correct.
3.2 PREPARATION
A. Correct irregularities in substrate gradient and elevation by scarifying, reshaping, and re-compacting.
B. Do not place fill on soft, muddy, or frozen surfaces.
3.3 AGGREGATE PLACEMENT
A. Aggregate Subbase: Type C or better, No. 2A, Section 703.2, placement per PennDOT Publication 408 Section 350.
3.4 TOLERANCES
A. Section 01 40 00 – Quality Requirements: Tolerances.
3.5 FIELD QUALITY CONTROL
A. Section 01 40 00 – Quality Requirements: Field inspecting, testing, adjusting, and balancing.
3.6 COMPACTION
A. Refer to Section 31 23 23.33 – Flowable Fill.
3.7 SCHEDULE
A. Refer to Restoration Schedule seen in Section 32 12 16 – Asphalt Paving.
END OF SECTION 32 11 23
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