Attachment 11 Pipe Bedding gradation clarification_0003.pdf

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Repair/replace sewer lines, Big Hole NB, Wisdom MT
Solicitation number
140P8320R0002
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C. Quality Control Submittals:

1. Sub-base Materials: Name and location of source, stockpile number, and applicable test results.

2. Base Materials: Name and location of source, stockpile number, and applicable test results.

3. Structural Backfill: Name and location of source, stockpile number, and applicable test results.

4. Other Aggregates: Name and location of source, stockpile number, and applicable test results.

5. Excavation Procedure: Submit a lay out drawing or detailed outline of intended excavation procedure for Contracting Officer's information. This submittal will not relieve the Contractor of responsibility for the successful performance of intended excavation methods.

1.4 QUALITY ASSURANCE

A. Furnish each aggregate material from single source throughout the Work.

PART 2 - PRODUCTS

2.1 GENERAL

A. All aggregate and backfill material shall be approved and certified weed-free, before use and be free of cinders, ashes, ice, frozen soil, large hard clods, organic debris, or other deleterious items.

2.2 AGGREGATE MATERIALS

A. Pipe Zone Bedding: Bedding material shall be primarily sand and gravel, having a plasticity index less than 6. Gradation shall limit the amount passing the No. 200 sieve to 10 percent maximum. Bedding material must comply with the grading requirements for the sieve sizes shown in the following table:

B dd. G d. e mg ra mg Sieve Size Percent Passing 1 1/2" 99-100 1" 75-100 5/8" 50-100 No.4 20-80 No.40 3-4 No. 200 l0Max Sand Equivalent 35 Min

BIHO- 186113 310516 - 2

AGGREGATES FOR EARTHWORK

NPS response: while it is possible for the bedding material to meet both gradation requirements of the No. 40 and No. 200 sieve, the engineer will review bedding material that closely adheres to to the proposed gradation, but as per the specs, no more than 10% should pass the No. 200 screen.

Attachment 11: Pipe bedding gradation clarification

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