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Section 20 - Landscaping

Planting materials shall be as specified in Section 50-43, "Landscaping Materials”, and

these Specifications, and shall be installed in accordance with Standard Drawings L-1 and L-2.

The Contractor shall obtain recommendations for the use of pesticides from a licensed Pest

Control Adviser in accordance with the requirements of the California Food and Agricultural

Code. At least twenty-four (24) hours prior to using any pesticides, a copy of such

recommendations shall be submitted to the Agency for approval. The recommendations shall

include, but not be limited to, the pesticides to be used, rates of application, methods of

application and areas to which pesticides are to be applied.

Pesticides for weed control shall be applied with a photosensitive dye which will produce a

contrasting color when sprayed upon the ground. The color shall disappear between two (2)

and three (3) days after being applied. The dye shall not stain any surfaces nor injure plant or

animal life when applied at the manufacturer's recommended application rate.

Pesticides shall not be applied when weather conditions, including wind conditions, are

unsuitable for such work.

Any new or existing plants which, in the opinion of the Agency, have been damaged by the

application of pesticides shall be replaced by the Contractor at his expense.

20-4.02 Preparing Planting Areas

The Agency shall approve the ground locations of plants by inspecting the placement of the

plants, stakes, or other suitable markers. The Contractor shall furnish all labor, materials, and

transportation required to adequately mark the various plant locations.

In areas to be planted, all rocks and other debris greater than one inch (1”) in diameter shall

be removed and disposed of.

In areas to be planted, the grade shall be one (1”) to two inches (2”) below the planned

finish grade prior to conditioning the soil. In all other areas, the grades shall be as indicated at

the grading plane for the type of facility to be constructed thereon.

The formation and compaction of embankments shall conform to the provisions as specified

in Section 18, "Earthwork”, of these Specifications and as modified herein. In areas to be

planted, compaction of the fill shall be not more than eighty-five percent (85%) for the upper one

foot (1’) of such fill.

Cultivation shall be performed with as many passes with the cultivator as necessary, as

determined by the Agency, to produce a friable, uniformly mixed soil, free of pockets of unmixed

soil, amendments, or fertilizers if such are specified.

Areas adjacent to walks, structures, or other such facilities that are inaccessible or difficult to

reach by mechanical rotary cultivators shall be cultivated by hand.

After cultivation, the surface shall be raked, rolled, or otherwise smoothed to remove ridges

and fill depressions. The finished surface shall be uniform, evenly graded, and reasonably firm.

The grades of the finished surface shall be approximately two inches (2”) below the top of

adjacent curbs or pavement, unless otherwise shown on the plans and except for those areas

designated to receive topsoil, where the grade shall be six inches (6”) below planned finish

Soil preparation and planting operations shall be conducted under favorable weather

conditions only. Soil shall not be worked when excessively dry or wet and the Agency has the

right to stop any work taking place during a period when conditions are considered detrimental

to soil structure or plant growth.

The work involved in preparing planting areas shall be so conducted that the existing flow

line in drainage ditches will be maintained. Material displaced by the Contractor's operations

that interferes with drainage shall be removed and dispersed of as directed by the Agency.

Cultivation shall be performed until the soil is in a loose condition to a minimum depth of six

inches (6”). Soil clods shall not be larger than two inches (2”) in any dimension after cultivation.