HomeMy WebLinkAboutSection 02220 Excavation and Backfilling
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SECTION 02220 EXCAVATION AND BACKFILLING
PART 1 - GENERAL
1.01 SCOPE:
A. Summary of Work: The CONTRACTOR shall furnish all labor, materials, and
equipment to perform the excavation and backfilling as shown on the Drawings.
1. SECTION 02401 Dewatering
2. SECTION 02200 Earthwork
1.02 APPLICABLE PUBLICATIONS:
A. American Society of Testing Materials, (ASTM)
1. D-698-00a Standard Test Methods for Laboratory compaction Characteristics
of Soil Using the Standard Effort (56,000 ft-lbf/cu. ft.).
2. D-1557-00 Standard Test Methods for Laboratory compaction Characteristics
of Soil Using the Modified Effort (12,400 ft-lbf/cu. ft.).
3. D-4253-00 Standard Test Methods for Maximum Index Density and Unit Weight
of Soils Using a Vibratory Table.
4. D-4254-00 Standard Test Method for Minimum Index Density and Unit Weight
of Soils and Calculation of Relative Density.
B. Florida Department of Transportation
1. Standard Specifications for Road and Bridge Construction, latest edition,
(FDOT).
C. Miscellaneous Project Data:
1. Subsurface soil data logs
2. Project geotechnical report
1.03 DEFINITIONS: (Not Used)
1.04 SUBMITTALS: The CONTRACTOR shall submit, prior to the start of work, the planned
method of construction of the embankments shown on the Drawings, or as specified
herein, for the ENGINEER's review. This plan shall also indicate the intended construction
sequence for backfilling operation.
1.05 QUALIFICATIONS: (Not Used)
1.06 RESPONSIBILITIES: (Not Used)
1.07 CERTIFICATIONS AND TESTING: Field density tests in accordance with ASTM
Standards, for each type of material used in backfilling may be required. Failure to meet
the specified density will require the CONTRACTOR to recompact and retest, at its own
expense, those areas directed by the ENGINEER
1.08 INSPECTION COORDINATION: The CONTRACTOR shall provide access to the WORK
for the ENGINEER as requested for inspection. The Contractor shall provide 48 hours
notice of its intention to begin new WORK activities.
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PART 2 - PRODUCTS
2.01 STRUCTURAL BACKFILL: The CONTRACTOR shall provide satisfactory structural
backfill material which shall consist of material free of muck, stumps, rocks, or other
material considered unacceptable by the ENGINEER. The general requirements for fill
shall be in accordance with FDOT 120-7.1 and 7.2.
2.02 EMBANKMENT FILL: The CONTRACTOR shall provide embankment fill free of muck,
stumps, roots, brush, vegetation or other material considered undesirable by the
ENGINEER. The general requirements of embankment fill shall be in accordance with
FDOT 120-7.1 and 7.2.
PART 3 - EXECUTION
3.01 SITE PREPARATION:
A. Clearing and Grubbing: The CONTRACTOR shall perform clearing and grubbing in
accordance with the following provisions:
1. Perform only in areas where earthwork or other construction operations are to
be performed or otherwise shown on Drawings.
2. Protect tops, trunks, and roots of existing trees that are to remain on the site.
3. Clear areas and dispose of other trees, brush and vegetation before starting
construction.
4. Remove tree stumps and roots larger than three inches in diameter and backfill
resulting excavations with approved material.
B. Stripping: The CONTRACTOR shall remove topsoil from areas within limits of
excavation and areas designated to receive compaction as shown on the Drawings,
required and as provided below:
1. Scrape area clean of all brush, grass, weeds, roots and other material.
2. Strip to depth of approximately six inches or to a sufficient depth to remove
excessive roots in heavy vegetation or brush areas and as required
segregating topsoil.
3. Stockpile topsoil in areas where it will not interfere with construction operations
or existing facilities. Stockpiled topsoil shall be reasonably free of subsoil,
debris and stones larger than two inches in diameter.
3.02 DISPOSAL OF SURPLUS AND UNSUITABLE MATERIAL: The CONTRACTOR shall
dispose of all excess or unsuitable material off-site or in areas otherwise approved by the
ENGINEER.
3.03 STOCKPILE OF EXCAVATED MATERIAL: The CONTRACTOR shall stockpile excavated
materials in areas shown on the Drawings or in areas otherwise approved by the
ENGINEER.
3.04 PLACEMENT OF FILL: The CONTRACTOR shall place backfill true to the lines, grades
and cross sections shown in the Drawings or as ordered by the ENGINEER. Backfill shall
be deposited by the CONTRACTOR in horizontal layers not exceeding twelve (12”) inches
in depth measured loose, and shall be compacted to a density as shown on the plans, or a
density of not less than 95 percent of the maximum density as determined by ASTM
Standards. Backfill shall not be placed against fresh concrete without the approval of the
ENGINEER.
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3.05 GRADING: The CONTRACTOR shall perform grading as shown on the Drawings,
required and provided for below:
A. Grade and compact all areas within the project area, including excavated and filled
sections and adjacent transition areas, reasonably smooth, and free from irregular
surface changes.
B. Degree of finish shall be that ordinarily obtained from blade grader or scraper
operations except as otherwise specified.
C. Finished rough grades shall generally be not more than one quarter foot above or
below those indicated with due allowances for topsoil.
D. Finish all ditches, swales and gutters to drain readily.
E. Provide roundings at top and bottom of banks and at other breaks in grade.
3.06 CLEANUP: The CONTRACTOR shall cleanup the site as required and provided for
below:
A. Clear surfaces of all stones, roots, grading stakes and other objectionable materials.
B. Keep paved areas clean and promptly remove rock or dirt dropped upon surfaces.
3.07 PROTECTION AND MAINTENANCE: The CONTRACTOR shall maintain the
embankments until final acceptance of all work. The maintenance shall include repairs of
any erosion, slides, or other damages.
END OF SECTION