DIVISION 31 - SITE WORK
SECTION 31 20 00 - EARTHWORK
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PART 1 - GENERAL
1.1
Work of this section includes
.1
Provide excavation and backfill at locations indicated on the
drawings.
.2
Provide preparation of subgrade for support of paving work
1.2 Quality Assurance
.1
Definition - "Excavation" consists of removal of material encountered
to subgrade elevations indicated, including paving and subsoil striping
and the subsequent disposal of materials removed.
.2
Codes and Standards: Perform excavation work in compliance with
applicable requirements of authorities having jurisdiction.
1.3 Job Conditions
.1
Locate existing underground utilities in areas of work. If utilities are to
remain in place, provide adequate means of support and protection
during earthwork operations. Should uncharted or incorrectly charted
utilities be encountered during excavation, consult utility companies
immediately for directions. Cooperate with Owner and utility
companies in keeping respective services and facilities in operation.
.2
Protection of Persons and Property - Barricade open excavations
occurring as part of this work and post with warning lights.
.3
Protect structures, utilities, sidewalks, pavements and other facilities
from damage caused by settlement, lateral movement, undermining,
washout and other hazards created by earthwork operations.
.4
The use of explosives is not permitted.
PART 2 - PRODUCTS
2.1 Soil Materials
.1
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Subbase Material - Naturally or artificially graded mixture of natural or
crushed gravel, crushed stone, crushed slag, natural or crushed sand.
DIVISION 31 - SITE WORK
SECTION 31 20 00 - EARTHWORK
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Comply with NYSDOT Standard Specification Item 304.02 or 304.04.
Submit mixture for approval prior to commencement of work.
.2
Backfill Material - Satisfactory soil materials free of clay, rock or
gravel larger than 2" in any dimension, debris, waste, frozen
materials, vegetable and other deleterious matter. Submit mixture
for approval prior to commencement of work.
PART 3 - EXECUTION
3.1
Excavation
.1
Authorized excavation includes excavations of pavements, earth and
other obstructions visible on ground surface; items indicated to be
demolished and removed; together with earth and other materials
encountered that are not classified as unauthorized excavation.
.2
Unauthorized excavation consists of removal of materials beyond
indicated subgrade elevations. Unauthorized excavation as well as
remedial work directed by Project Architect, shall be at Contractor's
expense.
.3
Provide a stake out of all utilities prior to start of work. Protect and
maintain utilities against damage. Immediately report damage to the
Project Architect and make prompt repair of any damage or
disturbance.
.4
Excavate trench to proper depth and grade no wider than required
for placement of work.
.5
When excavation has reached required subgrade elevations, notify
Project Inspector.
.6
Shoring and Bracing - Provide materials for shoring and bracing as
required to adequately support walls of excavation.
.7
Do not allow water to accumulate in excavations. Remove water to
prevent softening of footing bottoms and other soil changes
detrimental to stability of subgrades and foundations. Provide and
maintain pumps and discharge lines necessary to convey water away
from excavations to existing catch basins. Do not discharge dirt or
debris into drainage system.
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DIVISION 31 - SITE WORK
SECTION 31 20 00 - EARTHWORK
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.8
3.2
Material Storage - Stockpile satisfactory excavated materials where
directed by Owner, until required for backfill or fill. Dispose of
excess soil material and waste material as herein specified.
Compaction
.1
General - Control soil compaction during construction providing
minimum percentage of density specified for each area classification
indicated below.
.1
.2
3.3
Moisture Control - Where subgrade or layer of soil material must be
moisture conditioned before compaction, uniformly apply water to
surface to prevent free water appearing on surface during or
subsequent to compaction operations.
Backfill
.1
.2
3.5
Compact top 12" of subgrade and each 12" layer of backfill or
fill material at 95 percent maximum dry or relative dry density.
Backfill excavations in 12" layers as promptly as work permits, but
not until completion of the following:
.1
Acceptance of construction below finish grade.
.2
Removal of trash and debris from locations to be backfilled.
When a compacted subbase is shown to be 6" or less, place material
in a single layer. When shown to be more than 6" thick, place
material in equal layers, except no single layer more than 6" or less
than 3" in thickness when compacted.
Disposal
.1
Removal From Owner's Property - Remove waste materials, including
acceptable excavated material, trash and debris and dispose of it off
Owner's property.
END OF SECTION
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