07/24/01
20.1
SECTION 20
LANDSCAPING
20-1 GENERAL
Landscaping work shall consist of performing roadway planting, park landscaping, irrigation
installation, and other work necessary for improving the appearance of the roadside and park
facilities, as shown on the Plans and in accordance with these Specifications.
20-2 MATERIALS
Landscaping materials shall conform to the requirements in Section 50-43, “Landscaping
Materials”, and these Specifications.
20-2.01 Root Control Barrier
Root control barrier shall be installed prior to topsoil placement or by means of trenching
against existing surfaces. Panels shall be installed slightly higher than finish grade [one inch
(1”)], flush against edge of pavement, and joined with locking strips or integral male/female
sliding locks. Locking mechanism shall have a close tolerance to restrict any slippage between
panels. Barrier shall be installed with root deflectors facing inward and shall provide a
continuous barrier around the perimeter of each median, tree well, sidewalk or other hardscape
surface.
20-2.02 Topsoil
Topsoil shall be placed and spread to the line and grade as shown on the Plans or as
directed by the Agency. Topsoil shall be compacted to approximately eighty percent (80%)
relative compaction. Topsoil in tree or shrub pits shall be lightly tamped by hand so as to form a
firm setting for the plant, but not hinder growth. Mechanical tamping will not be permitted.
After spreading the topsoil, any extraneous or unacceptable material not previously removed
shall be raked off and removed from the topsoil area. Spreading and compacting shall be
completed in such a manner that seeding, sodding, or planting can proceed without additional
grading.
Immediately before planting, the topsoil shall be cultivated and raked to provide a uniformly
smooth, firm, friable, fine textured finished surface. No grading equipment will be permitted on
the topsoil after the area has been finish graded and prepared for planting.
20-2.03 Soil Amendment
Soil amendment shall be uniformly spread at the rate specified and incorporated with a
rotary cultivator to obtain a homogeneously blended soil six inches (6”) in depth, unless
specified otherwise in the Special Provisions.
20-2.04 Liquid Green Dye
Liquid green dye used in erosion control and hydroseeding work shall be forty-eight- (48-)
hour colorfast, applied at the rate of two (2) quarts per acre, unless otherwise specified in the
Special Provisions.
20-2.05 Mulch
Mulch shall be top dressed, where specified, to a minimum depth of three inches (3”) over
soil level. Taper mulch away from the crowns of all newly planted and existing trees.
20-3 EROSION CONTROL
Erosion control materials shall conform to Section 50-43, “Landscaping Materials”, the
Special Provisions, and these Specifications.



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