SECTION 02315 EXCAVATION

This spec was part of the Des Plaines, IL River WRF project tat bid Feb 26, 2015.

SECTION 02315
EXCAVATION

PART 1 GENERAL

1.1 SUMMARY
A. Section Includes:
1. Excavating for building foundations.
2. Excavating for paving, roads, and parking areas.
3. Excavating for slabs-on-grade.
4. Excavating for site structures.
5. Excavating for landscaping.
6. Excavating for utilities.

1.2 SUBMITTALS
A. Submit in accordance with Section 01330 - Submittal Procedures:
1. Excavation Protection Plan: Describe sheeting, shoring, and bracing materials
and installation required to protect excavations and adjacent structures and
property; include structural calculations to support plan

PART 2 PRODUCTS
Not Used.

PART 3 EXECUTION

3.1 PREPARATION
A. Notify affected utility companies before starting work and comply with their
requirements.
B. Mark location of utilities.
C. Identify required lines, levels, contours, and datum.

3.2 EXCAVATION
A. Underpin adjacent structures that may be damaged by excavation work, including utilities
and pipe chases. All poles, buildings, fences, and other surface structures shall be
protected and preserved by the Contractor and shall be repaired or replaced if necessary
and left in as good condition as before Work started. All pipes conduits, sewers, drains,
foundations, and other subsurface structures shall be properly supported and protected
during and after construction and repaired or replaced, if necessary, and left in as good
condition as before Work started.
B. Excavate subsoil to accommodate building foundations, slabs-on-grade paving and site
structures. At no additional cost to the Owner provide shoring, sheeting, bracing or other
supporting structures to protect existing surface and subsurface structures, and to comply
with regulatory requirements.
C. Shoring and Bracing:
1. Establish requirements for trench shoring and bracing to comply with local codes
and authorities. Maintain shoring and bracing in excavations regardless of time
period excavations will be open. Provide shoring, sheeting, and bracing required
to excavate for and construct all below grade structures.
2. Remove shoring and bracing when no longer required. Where sheeting is
allowed to remain, cut top of sheeting at 24 inches below required grade
elevation.
D. Excavate to working elevation for piling work.
E. Compact disturbed load-bearing granular soil in direct contact with foundations to
required bearing capacity in accordance with project geotechnical report; perform
compaction in accordance with Section 02320 and 02324.
F. Slope banks with machine to angle of repose or less until shored.
G. Do not interfere with 45 degree bearing splay of foundations.
H. Grade top perimeter of excavation to prevent surface water from draining into
excavation.
I. Trim excavation. Remove loose matter.
J. Remove lumped subsoil, boulders, and rocks.
K. Notify Architect/Engineer of unexpected subsurface conditions.
L. Correct areas over excavated as specified in Section 02320 and as directed by
Architect/Engineer.
M. Stockpile subsoil in area designated on site to depth not exceeding 8 feet and protect from
erosion.
N. Remove excess and unsuitable material from site.
O. Removal of Water:
1. The contractor shall provide and operate a dewatering system as necessary to
prevent water from entering any excavations.
2. Dewatering shall keep the groundwater level at least one foot below the bottom
of the excavation. Dewatering shall be accomplished prior to excavation and
shall be maintained until the finished work is safe from injury.
3. Water removed from the site shall be disposed of by the contractor such that it
does not damage any adjacent property or work. The Contractor shall provide
acceptable silt fencing, hay bales, and/or means to remove soil or fines from the
water prior to disposal. Groundwater shall be conveyed to point of discharge
through pipelines; open ditches and trenches are not permitted. Use of the
Owner’s utilities is not permitted without written consent.
4. The costs of all sumps, wells, well points, piping, pumping, excavation, and other
work associated with dewatering shall be borne by the Contractor. Contractor
shall acquire all permits necessary for construction, operation, and removal of
dewatering systems.
P. Repair or replace items indicated to remain damaged by excavation.

3.3 FIELD QUALITY CONTROL
A. Section 01400 - Quality Requirements: Testing and Inspection Services.
B. Provide for visual inspection and testing of bearing subgrades in accordance with project
geotechnical report before installing subsequent work.

3.4 PROTECTION
A. Prevent displacement or loose soil from falling into excavation; maintain soil stability.
B. Protect bottom of excavations and soil adjacent to and beneath foundation from freezing.
Provide protection against freezing when atmospheric temperature is less than 35˚ F until
backfilling operations are completed.
C. Protect structures, utilities and other facilities from damage caused by settlement, lateral
movement, undermining, washout, and other hazards created by earth operations.
D. Provide fence or barricades around open excavations. Protection must be in place at the
end of each working day for active excavation, and left in place for completed
excavations.

END OF SECTION