Section 20 - Landscaping
07/24/01
20.4
Planting areas that have been cultivated and become compacted for any reason shall be
recultivated by the Contractor at his expense.
20-4.03 Header Boards
Header boards shall conform to Section 50-43.11, "Lumber", of these Specifications and
shall be installed in accordance with Standard Drawing L-27.
Header board stakes shall be of the size and shape shown on the Plans. Each stake shall
be driven flush with the top edge of the header board and the stake top shall be beveled away
from the header board on a forty-five-degree (45
°
) angle. Stakes shall be at four feet (4’) on
center along the length of the header board. Stakes shall be attached to header boards with a
minimum of two (2) 12-penny hot-dip galvanized common nails per stake.
Where asphalt concrete or portland cement concrete surfacing must be removed to permit
the installation of header boards, and no joint exists between the surfacing to be removed and
surfacing to remain in place, the surfacing shall be cut in a neat line to a minimum depth of
0.17-foot with a power driven saw before the surfacing is removed.
20-4.04 Planting
Plant material shall conform to Section 50-43.14, “Plants”, of these Specifications and shall
be installed in accordance with Standard Drawings L-1 and L-2.
No planting shall be done in any area until the area concerned has been prepared in
accordance with these Specifications and the Special Provisions and presents a neat and
uniform appearance satisfactory to the Agency. When an irrigation system is required, the
irrigation system shall be installed and checked for coverage to the satisfaction of the Agency
prior to planting plants.
Planting will not be allowed in any area that in the opinion of the Landscape Architect is too
wet or too dry or that is in any other way unacceptable for planting.
Where vines are to be planted against walls or fences, the vines shall be planted as close as
possible to the wall or fence as shown on the Plans.
Plants shall be removed from the containers in such a manner that the ball of earth
surrounding the roots remains intact, and they shall be planted and watered as hereinafter
specified immediately after removal from the containers. Containers shall not be cut prior to
delivery to the planting site.
Roots of plants not in containers shall be kept moist and covered until such plants are
planted.
Before planting in holes or trenches, water shall be applied to the backfill with a pipe or tube
inserted to the bottom of the hole until the backfill material is saturated for the full depth. Backfill
for planting holes and trenches shall be placed in two (2) lifts. Water shall be applied to the
backfill between lifts with a hose and allowed to fill and percolate. Additional backfill shall not be
placed until the water has percolated and saturated the planting hole to its full depth.
Each tree and shrub location shall be as shown on the Plans, or as approved by the
Agency. Plants shall be spaced as indicated on the Plans or in the Special Provisions. Plants
in adjacent rows shall be staggered. Tree and shrub locations shall not conflict with any
existing utilities, utility boxes, or other improvements. Plants improperly located shall be
replanted by the Contractor in the proper location at no additional cost to the Agency.
Planting shall be performed in accordance with the details shown on the Plans and Standard
Drawings. Each plant shall be placed in the planting excavation in an upright position in the
center of the hole, and the space around it backfilled with planting mix so that amended soil of a
thickness equal to at least half the diameter of the root ball is around the sides of the root ball.
Organic matter shall not be placed beneath the plant's root ball. Plants shall be set in the
backfill material in flat bottomed holes to such depth that after the soil has settled, the top of the
plant ball will be one inch (1") above the bottom of the basin or even with surrounding soil where
there is no basin. Plants shall be planted in such a manner that the roots will not be restricted



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