Amendment 4 31 23 17 ROCK EXCAVATION 2020 08 14 edits_0004.pdf

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ROCK EXCAVATION

SECTION 31 23 17

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Earthwork - excavation, grading, disposal of waste and surplus materials, and other

Earthwork related work.

B. Related Specification Sections include but are not necessarily limited to:

1. Division 1 - Specification

2. Section 31 23 33 – Trenching, Backfilling, and Compacting for Utilities

3. Section 31 25 00 - Soil Erosion and Sediment Control.

4. Section 31 23 00 - Earthwork

1.2 QUALITY ASSURANCE

A. Referenced Standards:

1. United States Bureau of Mines.

a. Report of Investigations 8507/1980, titled “Structure Response and Damage Produced by Ground Vibrations from Surface Mine Blasting.”

2. Occupational Safety and Health Administration (OSHA):

a. 29 CFR Part 1926, Subpart P – Excavations, Occupational Safety and Health Standards, referred to herein as OSHA Standards.

1.3 DEFINITIONS

A. Rock Excavation:

1. Rock excavation includes any material which cannot be dislodged by a D-8 Caterpillar tractor, or equivalent, equipped with a hydraulically operated power ripper, or by a

Caterpillar 330 hydraulic excavator, or equivalent, without the use of hammering, or drilling

B. Geotechnical Engineer: Independent geotechnical specialist providing field quality control for the project. The "Geotechnical Engineer" will be provided by the contractor.

C. Structure: Buildings, foundations, slabs, tanks, curbs, or other man-made stationary features occurring above or below ground surface.

1.4 SUBMITTALS

A. See Section 01 33 23 for requirements for the mechanics and administration of the submittal process.

B. Shop Drawings:

1. Proposed excavation plans and procedures

2. Methodology Report

1.5 PROJECT CONDITIONS

A. See Specification Section 31 23 00.

B. Bedrock starts at the surface.

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PART 2 - EXECUTION

2.1 PROTECTION

A. Erosion Control:

1. See Specification Section 31 25 00.

2. Clean paved roadways daily of any spillage of dirt, rocks or debris from vehicles and equipment entering or leaving site.

3. Conduct work to minimize erosion of site. Remove eroded material washed off site.

a. If necessary or requested by Contracting Officer, construct stilling areas to settle and detain eroded material.

B. Protect existing surface and subsurface features on-site and adjacent to site:

1. See Specification Section 31 23 00.

2.2 ROCK EXCAVATION

A. The rock excavation work includes the offsite disposition of all material:

1. That exceed quantities required for earthwork on the project.

2. That the Contractor’s Geotechnical Engineer classifies as unclassified excavation.

3. That the Contractor’s Geotechnical Engineer classifies as unacceptable.

4. That the Contractor’s Geotechnical Engineer classifies as potentially contaminated.

B. Contract Drawings may indicate both existing grade and rough grade required for construction of Project.

1. Stake all units, structures, piping, roads, parking areas and walks and establish their elevations.

2. Perform other layout work required.

3. Replace property corner markers to original location if disturbed or destroyed.

C. When rock is encountered:

1. Strip free of earth.

2. Remove rock to the lines and grades indicated on the Drawings and as needed for proper installation of the Work.

2.3 USE OF EXPLOSIVES

A. NOT PERMITTED

2.4 FIELD QUALITY CONTROL

A. All excavation, trenching, and related sheeting, bracing, etc. shall comply with the requirements of OSHA standards 29 CFR Part 1929 Subpart P, and state requirements. Where conflict between OSHA and state regulations exists, the more stringent requirements shall apply.

B. Special Inspection and Testing:

1. See Section 01 40 00.

C. Responsibilities of Testing Agency for Site Excavation and Grading:

1. All testing, observation and work indicated as being performed by the Contractor’s

Geotechnical Engineer in other than Article 3.5 of this Specification Section.

END OF SECTION

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