A07.02-Page_2_from_01_11_00.pdf

American River Common Features (ARCF) Spec No. 2079 Natomas Basin - Reach I Contract 1

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SUMMARY OF WORK

08/11

PART 1 GENERAL

1.1 WORK COVERED BY CONTRACT DOCUMENTS

1.1.1 Project Description

Reach I Contract 1 extends along the Garden Highway from Gateway Oaks Drive (Station 0+00) to approximately Northgate Boulevard (Station 115+00). Levee Improvements will include a Slag cement-cement-bentonite (SCCB) cutoff wall, drainage blanket, and utility relocations.

The levee is between 9 and 24 feet tall. Crown elevations vary between approximately 39 and 43 feet (NAVD 88). Landside toe elevations range from approximately 19 to 36 feet. The landside slope ranges between approximately 1.1 horizontal to 1 vertical (1.1H:1V) and 3.6H:1V.

A new slag-cement-cement-bentonite cutoff wall will be placed through Garden Highway and the bike trail from Station 10+41 (Control Line B) to Station 113+00 (Control Line A) and will overlap the existing cement-bentonite (CB) cutoff wall by 50-feet from Station 10+41 (Control Line B) to Station 10+91 (Control Line B). Suitable soil from the excavation of the cutoff wall will be used to construct the Reach 19A seepage berm and stockpile area B. If additional suitable soil remains after construction of the Reach 19A seepage berm, the soil will be placed at the Hewitt stockpile location. There will be a gap between Station 27+00 and 30+10 underneath Interstate 5 (I-5).

Slope flattening and a blanket drain will be constructed along the landside levee slope beneath and adjacent to the I-5 Bridge, near stations 25+00 and 32+00 (Control Line B). The blanket will have a uniform thickness of two feet perpendicular to the slope and will extend to elevation 33.5 within the levee.

Access to the construction site will be from Garden Highway and will require temporary, partial and full shutdown of Garden Highway. Staging area include a portion of Discovery Park as shown on the Drawings.

1.2 EXISTING FACILITIES

In addition to "FAR 52.236-9, Protection of Existing Vegetation, Structures, Equipment, Utilities, and Improvements", the Contractor shall:

a. Remove or alter existing facilities in such a manner as to prevent injury or damage to any portions of the existing facilities which remain.

b. Repair or replace portions of existing facilities which have been altered or damaged during construction operations to match existing or adjoining facilities, as approved by the Contracting Officer. At the completion of operations, existing facilities shall be in a condition equal to or better than that which existed before new work started all at Contractor's sole expense.

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