FKC_31_30_00-12_Att_7_Amendment_0002_0002.pdf

Solicitation No: 140R2020R0009 Specifications No. 20-C0907

STANTEC/184031016 EARTHWORK

FKC MIDDLE REACH CAPACITY CORRECTION PROJECT PHASE 1 PAGE 31 30 00 - 12

3) Any and all excess excavation or over-excavation performed by the CONTRACTOR for any purpose or reason except for additional excavation as may be prescribed by the CONTRACTING OFFICERS REPRESENTATIVE, and whether or not due to the fault of the CONTRACTOR, shall be at the expense of the CONTRACTOR. Fill and compacting of fill for such excess excavation or over-excavation shall be at the expense of the CONTRACTOR.

2. Deer Creek and White River Over-Excavation/Ground Improvement Zones

a. Deer Creek Over-Excavation Zone: 0.3 miles of canal and structure over-excavation is required at the Deer Creek siphon, check structure, inlet and outlet transition structures, and along a length of canal upstream and downstream of Deer Creek. Refer to the contract drawings for details on the over-excavation limits.

b. White River Over-Excavation Zone: 0.13 miles of canal and structure over-excavation is required at the White River siphon, check structure, inlet and outlet transition structures, and along a length of canal upstream and downstream of White River. Refer to the contract drawings for details on the over-excavation limits.

c. The indicated over-excavation at these two areas shall consist of the removal, re-placement, and re-compaction of the native subgrade material to the extents shown on the contract drawings. The material shall be placed and compacted in accordance paragraphs 3.2 (Backfill and Embankments) and

3.3 (Compacting Earth Materials).

d. The entire subgrade surface (footprint) under the over-excavation and backfill zone shall be thoroughly scarified to a depth of 12 inches, wetted or dried, and compacted to at least 95% of the specified minimum dry density as described in this specification.

e. The recompacted soil should be benched into the exposed excavation embankment native soil to prevent development of a preferential slip plane.

f. The ground improvement shall be performed in dry conditions.

D. Canal Excavation

1. General

a. The canal shall be excavated to the lines, grades and dimensions shown on the drawings. Stones and indurated materials larger than 5 inches shall be removed from materials to be used for compacted embankments as specified in paragraph 3.4 (Embankments For Canal). Stones larger than 3 inches shall not be allowed withing 12 inches of canal lining.

b. Care shall be taken to prevent overbreakage or loosening of material on bottoms or side slopes upon or against which lining is to be placed. Where the original ground surface is below the grade of the canal, the bottom of the

Amendment No 0002 Attachment No 7 swolfert Cross-Out swolfert Cross-Out swolfert Cross-Out