31_23_16_Excavation-rev20161102.pdf

U.S. General Services Adminstration Mid-Atlantic Region

Public Buildings Service

SECTION 31 23 00

EXCAVATION

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PART 1 – GENERAL

1.01 SECTION INCLUDES:

A. Summary B. Laws and Regulations C. Safety D. References E. Quality Control F. Submittals G. Project Coordination and Scheduling H. Preparation I. General Excavation J. Materials Handling and Disposal

1.02 SUMMARY:

A. This Section includes provisions for excavation and handling of soil within the excavation limits provided in the Drawings.

1.03 LAWS AND REGULATIONS:

A. All work under this Contract shall be accomplished in accordance with regulations of local, county, State and Federal agencies and utility authority standards as they apply.

1.04 SAFETY:

A. Methods of operation utilized in work related to these specifications shall be such as to provide maximum protection against injury or death to workmen or the public.

Requirements of the United States and New Jersey Occupational Safety and Health Acts as to safety regulations and procedures shall be adhered to for all work covered under these specifications.

1.05 REFERENCES:

A. OSHA 29 CFR 1926 Subpart P – Excavations.

B. SW 846 - EPA Method No. 9095A - Paint Filter Test

1.06 QUALITY CONTROL:

A. Contractor’s Land Surveyor shall stake excavation boundaries indicated on the Drawings and perform initial survey as specified in Specification Section 01 72 00 - Construction Surveying

B. The Contractor shall layout the excavation-tracking grid shown on the Drawings.

C. Contractor shall perform surveying to record elevations during the course of the excavation Work. During performance of the Work, Contractor shall employ all equipment necessary for control of excavation depths, lines, and grades within required tolerances.

Public Buildings Service

SECTION 31 23 00

EXCAVATION

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D. Contractor shall verify final excavation horizontal limits and grades by survey (provided by Contractor’s Land Surveyor) and in a manner that is mutually acceptable to the Contractor and the Construction Manager. During the progress of Work, the Contractor shall provide survey data as the excavation progresses that consist of the following:

1. Designation of the Grid(s) excavated.

2. Horizontal limits of completed excavation in sufficient detail to determine limits of the material removed.

3. Vertical limits of excavation consisting of top of final grade or excavation limit in sufficient detail to verify quadrant elevations and to establish the progress of the completed Work.

E. Contractor personnel and equipment shall meet the training standards and requirements of OSHA 29 CFR 1926: Subpart P-Excavations.

1.07 SUBMITTALS:

A. The Contractor shall prepare and submit a Technical Execution Plan (TEP) in accordance with the procedures set forth in Specifications Section 01 33 00 – Submittal Procedures.

B. The TEP shall detail the Contractor’s proposed work sequence and excavation approach.

The TEP shall include a detailed Site Specific Dust Control Plan that provides provisions for monitoring and controlling dust in the work zone(s).

C. The Contractor shall submit a daily log of the Grids excavated.

D. The Contractor shall submit collection logs and analysis results for confirmation samples in accordance with the Confirmation Sampling Plan.

E. The Contractor shall submit a final as-built survey of excavation grids after confirmation sampling has deemed the Grid clean.

1.08 PROJECT CONDITIONS:

A. The Drawings show approximate locations of known structures requiring demolition prior to excavation (as specified in Specification Section 02 41 00 – Demolition) and other known structures and utilities requiring protection.

B. The Drawings show preliminary locations for dedicated temporary haul roads used to access the excavation areas. The Contractor may propose alternate road locations to the Construction Manager. These may not be built or used without Construction Manager Approval.

C. Work will involve the handling of materials containing substances that are potentially harmful to the health and safety of construction personnel. Perform work in compliance with applicable OSHA regulations, and in accordance with the Contractor’s Site-Specific

HASP.

Public Buildings Service

SECTION 31 23 00

EXCAVATION

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1.09 PROJECT COORDINATION AND SCHEDULING

A. Coordinate excavation and backfill with post-excavation sampling activities. The final excavation limits will be based on the confirmation sample results. The excavation will not be backfilled until the Construction Manager approves the excavation limits.

B. Sequence demolition, stump and root grubbing, excavation, backfill and restoration so that no more than three non-contiguous areas each no larger than 10 acres of disturbed (un-stabilized) land is being worked on at any given time.

C. Prevent cross-contamination and re-contamination of cleaned areas by every effort necessary.

PART 2 - PRODUCTS

Not Used

PART 3 - EXECUTION

3.01 PREPARATION:

A. Stakeout excavation limits and the excavation control Grid as shown on the Drawings.

B. Erect and maintain barriers and sediment and erosion controls around excavations and provide other necessary safety measures as specified in Specification Section 31 25 00 – Erosion and Sediment Controls.

C. Complete tree and brush cutting and clearing as specified in Specification Section 31 11 00 - Clearing and Grubbing

D. Install all other controls and monitoring required for excavation.

3.02 GENERAL EXCAVATION:

A. Excavation will take place in 30 by 30-foot Excavation Control Grid as shown on the Drawings. The Contractor shall install and maintain grade stakes at the grid centers.

B. Excavate in compliance with all applicable OSHA regulations..

C. Excavate in a manner that does not disturb or damage existing structures, utilities, monitoring wells, or other facilities not indicated for removal.

D. The Contractor will collect and analyze confirmation samples in accordance with the Confirmation Sampling Plan.

Public Buildings Service

SECTION 31 23 00

EXCAVATION

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E. Excavate impacted soils from the locations and within the horizontal and vertical limits indicated on the Construction Drawings. The Contractor will not be paid for excavation beyond the design limits without written approval from the Construction Manager.

F. Based on field observations or confirmation sampling results, the Construction Manager may direct additional excavation based on confirmation sampling.

G. The Contactor shall track and record the Grid cells excavated each day.

H. The Contractor shall not backfill an excavated Grid without written approval from the Construction Manager.

I. The Construction Manager has the authority to stop the excavation work for inspection, sampling, or testing at any time.

J. The Contractor shall direct stormwater runoff away from active excavation areas. Any standing water in an excavation area shall be removed prior to excavating that area.

K. The Contractor shall limit the grubbed area undergoing excavation, grading and backfill at any time to not more than three noncontiguous areas with each area no larger than 10 acres.

3.03 MATERIALS HANDLING AND DISPOSAL:

A. The Contractor may stage a limited (no more than 200 cubic yards) amount of excavated material within the excavation limit as approved by the Construction Manager. Otherwise, material shall be loaded directly into trucks for transport to the AOC 15 Consolidation Area or to GSA approved disposal facilities.

B. Soils containing free liquids shall not be loaded into trucks

END OF SECTION