Bid Package 08 North Well Field - Garney Construction

Colorado River Municipal Water District
Raw Water Supply Well Sites
Ward County North Well Field
PART 2 PRODUCTS
2.1 SUITABLE MATERIALS
A. Suitable materials shall consist of materials obtained on- or off-site and approved by the
Engineer for the purpose of subgrade preparation.
B. Remove all grass and other vegetation prior to preparing to a depth of 6 inches prior to
preparing subgrade.
C. Any underlying soft or otherwise unsuitable material shall be removed and replaced with
suitable material.
2.2 WASTE
A. Disposal of excavated materials shall be the responsibility of the Contractor.
PART 3 EXECUTION
3.1 PREPARATION
A. Excavations and embankments for site grading shall be finished to the shapes,
dimensions, and elevations shown on the Drawings.
B. Perform clearing operations prior to beginning excavation, grading, and embankment
operations.
C. Scarify, water, and compact subgrade to not less than 95% of standard Proctor density
(ASTM D-698) at optimum moisture content ±3%, to a depth of 6 inches minimum.
D. If construction occurs over an existing drilling mud pit, over-excavate one foot below
bottom of pit. Replace and compact using suitable native backfill materials (not drilling
mud).
3.2 GRADING
A. Provide uniform slopes and rounded changes in slope, free of low spots.
B. Drainage:
1. Provide and maintain positive surface water drainage around and away from
open excavations.
2. Keep opened excavations dry.
3. Remove free water in excavation promptly.
END OF SECTION
May 18, 2012
Subgrade Preparation
Revision 0 31 23 13 - 2