PIONEER PRAIRIE EXCAVATING SPECIFICATIONS
A. General
1. These general conditions are incorporated in and made a part of all contracts with
subcontractors doing work under contracts with DuPage Habitat for Humanity.
2. The subcontractor shall be responsible for complying with any OSHA requirements, as
they may apply to scaffolding, clean up, trenching and hazardous materials.
3. Subcontractor shall be responsible for all excavation for building walls, wing walls,
footings and piers per the plans.
4. All overdigs shall be large enough to permit the installation of drain tile, foundation
forms, piers, wing walls, etc. Overdigs shall be stepped per OSHA regulations if deep
enough or if soil conditions apply.
5. REVIEW CONCRETE FOUNDATION SECTION FOR SLAB FOUNDATION
NEW CODE REQUIRES SPECIAL FOUNDATION CONSTRUCTION WHICH
AFFECTS GRADES AND DEPTH OF EXCAVATION.
6. Contractor shall stockpile and protect disturbed topsoil from erosion.
7. Contractor shall install erosion control measures and inlet protection according to
the approved site plan in order to control runoff from lot.
B. Excavation
1. Using four-corner offset staking provided by engineer, excavator will lay out corner
stakes to complete excavation.
2. Subcontractor shall be responsible for checking staking against engineering plans and
pad elevations.
3. All grading to be within the limits of +/- one-tenth of a foot.
4. Subcontractor shall bring to the attention of the project superintendent any unsuitable
soil found in the building pad area. This shall include any organic material or any
material with a bearing capacity of less than 3000 PSF.
5. Subcontractor shall keep streets, curbs and walks clean and free of mud and clay due to
excavation operations.
6. Subcontractor shall provide adequate access on all four sides of the building for
material trucks.
7. Subcontractor shall not place excavation spoils on utility and drainage easements.
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Contractor’s Signature Dated
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DuPage Habitat for Humanity Dated
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PIONEER PRAIRIE EXCAVATING SPECIFICATIONS
B. Excavation Continued:
8. 3” (inches) crushed limestone shall be used to bridge marginal soils for buildings,
roads or driveways when recommended by the Soils Engineer. 3” (inch) crushed rock
shall be used as a bridging material for any of these purposes.
9. All basement and all dug footing excavations shall be oversized not to exceed 3 feet in
width on any side to permit the proper placement of concrete forms, drain tile and
waterproofing. When overdigs exceed 3 feet, the excess spoil generated and the
additional gravel required inside the foundation and footings for backfill shall be the
responsibility of the subcontractor at this own expense.
10. Garage overdigs shall not exceed 18 inches on the inside.
11. If soil conditions so require, excavator shall dig deeper to suitable bearing. Approval
must be given by DuPage Habitat for Humanity’s representative.
12. Pads are built per SEC Engineering plans. OBTAIN A COPY OF THE GRADING
PLAN FOR RELAVANT INFORMATION.
C. Backfill
1. AT NO TIME IS AN EXCAVATING MACHINE ALLOWED TO OPERATE
PARALLEL TO THE FOUNDATION.
2. Subcontractor shall backfill overdigs with material as follows:
a. Interior slab overdig 3” (inch) rock
b. Under-slab fill pea gravel
c. Overhead garage door exterior overdig/underslab fill: 3” (inch) rock to extend 3’
(feet) on each side of driveway
d. Exterior overdig: dry, loose, clay material
e. Backfill stoop areas with gravel to pad grade only
3. Garage overdig adjacent to basement: 3” (inch) rock
4. Subcontractor shall be responsible for determining that all drain tile risers, if any, are
firmly secured prior to proceeding with backfill. Any loose risers shall be brought to
the attention of the project superintendent.
5. All backfill to be “clean” and not contain construction debris.
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Contractor’s Signature Dated
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DuPage Habitat for Humanity Dated
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PIONEER PRAIRIE EXCAVATING SPECIFICATIONS
D. Sub-Grading
1. Sub-grading shall comply with engineering plans and shall provide positive drainage
away from buildings. All sub-grading shall be approved by DuPage Habitat for
Humanity’s representative upon completion. EXCAVATING CONTRACTOR
SHOULD REVIEW GRADE STAKES AND REQUEST ADDITONAL STAKES, IF
NECESSARY, TO INSURE SUB-GRADE IS ACCURATE.
E. Sub-grading Continued:
1. Sub-grading shall include the following:
a. Cutting of all swales per engineering plans.
b. Cutting of all drives. (Drives to be 18’ (feet) wide for 2-car garage per
engineering plans. Drives shall be cut to receive 8” (inches) of material.
STONE STOCKPILED ON LOT 8 AND LOT 10 TO BE USED AS
TEMPORARY DRIVEWAYS
c. Cutting of all sidewalks, service walks and patios.
2. Sub-grading shall include removal or placement of spoils from sewer and water
trenches, driveway cuts, swales and excavation.
3. Sub-grading shall be done to accommodate placement on 6” (inches) of topsoil to meet
finish grade.
4. Sub-grading shall include grading of utility trenches
F. Final Grade/Topsoil
1. Topsoil will be available on project site.
2. Final grading shall include the following:
a. Placement and spreading of 6” (inches) of topsoil to a distance 6” (inches) below
the top of foundation wall
b. Topsoil will be spread with machine small enough to reach all areas, or completed
by hand labor.
c. Prior to moving equipment offsite or to another lot, contractor shall notify project
superintendent when placement of topsoil is complete on each lot so as to insure
tolerance of grade and proper drainage.
c. Prior to topsoil being placed on lot, excavator will touch-up subgrade where
necessary.
d. In order to provide proper drainage away from the house, clay, if available, shall be
placed in depressions along the foundation 5’ (feet) from the house prior to
installation of topsoil.
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Contractor’s Signature Dated
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DuPage Habitat for Humanity
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