When the calculated required number of street trees results in a fractional unit greater than one, the resulting required number of street trees shall be rounded to the nearest whole number. To illustrate, the requirement of 1.75 street trees for a site with 70 feet of roadway frontage would be rounded upward to two street trees (e.g., 70 ÷ 40 = 1.75 → 2.0), whereas the requirement of 1.25 street trees for a site with 50 feet of roadway frontage would be rounded downward to one street tree (e.g., 50 ÷ 40 = 1.25 → 1.0). When a fractional requirement of 1.5 street trees results, the requirement would be rounded upward to two street trees (e.g., 60 ÷ 40 = 1.5 → 2.0).

When the calculated required number of street trees results in a fractional unit less than one, the resulting required number of street trees shall be rounded upward to one. To illustrate, the requirement of 0.5 street trees for a site with 20 feet of roadway frontage would be rounded upward to one street tree (e.g., 20 ÷ 40 = 0.5 → 1.0).

Where a street tree is prohibited pursuant to the exceptions provided in § 59-66.8B(2) of this section, the frontage associated with such prohibition shall not be considered when calculating the required quantity of street trees. To illustrate, if a site has 80 feet of roadway frontage and 15 feet are associated with required site triangles, the required quantity of street trees shall be calculated based on 65 feet of roadway frontage.

A maximum reduction of two street trees shall be permitted per roadway frontage.

There shall be no other street trees located between an existing street tree contributing to a reduction in the required quantity of street trees and the boundary of the site generating a requirement for street tree plantings.

The maximum distance between an existing street tree contributing to a reduction in the required quantity of street trees and a street tree planted in fulfillment of the required quantity of street trees shall be 40 feet on center. When a reduction in the required quantity of street trees would result in spacing of more than 40 feet on center, no reduction shall be granted.

No street tree planting shall be located within a required site triangle.

No street tree planting shall be located where visibility of motorists and pedestrians would be impaired to the satisfaction of the approving entity.

No street tree planting shall be located within 10 feet of a streetlight.

No street tree planting shall be located within 10 feet of a fire hydrant.

No street tree planting shall be located within 10 feet of, or otherwise block sight of, existing or proposed traffic or directional signage.

No street tree planting shall be located where otherwise prohibited by law or regulation or determined by the approving entity to be detrimental to the public health, safety, or welfare.

Minimum surface area: 16 square feet.

Tree wells shall incorporate the use of structured soils.

Tree wells shall be provided with an irrigation system that is, at a minimum, equipped with a timer, as well as a rain and freeze sensor, backflow prevention device, and shutoff valve. The irrigation system shall be designed to provide a maximum precipitation rate of two inches per hour.

Tree wells shall be covered by a flush-to-grade tree grate that is compliant with the Americans with Disabilities Act (ADA). The design of tree grates shall be, or shall be generally consistent with to the satisfaction of the approving entity, the "Khiva Tree Grate" with matte black finish by Urban Accessories of Tacoma, Washington. Said tree grate is illustrated below:

Alternative tree grates may be considered by the approving entity when the tree grate described in § 59-66.8B(2)(c)[4] is unavailable. In such cases, the design of alternative tree grates shall be generally compatible with the tree grate described in § 59-66.8B(2)(c)[4] to the satisfaction of the approving entity.

Acer pensylvanicum (striped maple).

Acer rubrum (red maple).

Acer saccharum (sugar maple).

Betula lenta (cherry birch).

Betula nigra (river birch).

Carpinus caroliniana (blue beech, hornbeam, musclewood).

Crataegus crus-galli (cockspur hawthorn).

Fagus grandifolia var. caroliniana (beech).

Fagus grandifolia var. grandifolia (beech).

Hamamelis virginiana (witch hazel).

Liquidambar styraciflua (sweet gum).

Liriodendron tulipifera (tulip tree).

Nyssa sylvatica (black gum, tupelo).

Ostrya virginiana (ironwood, hophornbeam).

Platanus occidentalis (sycamore, plane-tree).

Quercus alba (white oak).

Quercus bicolor (swamp white oak).

Quercus phellos (willow oak).

Quercus rubra (red oak).

Quercus stellata (post oak).

Quercus velutina (black oak).

Tilia americana (American linden, basswood).

Any other planting found by the approving entity to be drought- and disease-resistant, native, and deciduous.

All plantings of the genus "Carya" (hickories).

Juglans nigra (black walnut).

Castanea dentata (American chestnut).

Acer saccharinum (silver maple).

Sassafras albidum (sassafras).

All plantings of the genus "Populus" (aspens).

Salix nigra (black willow).

All plantings of the subgenus "Cerasus" (cherries).

All plantings of the genus "Ulmus" (elms).

Acer negundo (boxelder).

Quercus palustris (pin oak).

Quercus coccinea (scarlet oak).

Any other plantings found by the approving entity to be a non-native planting, fruit- or nut-bearing, commonly noted to have weak branches, attract insects, be short-lived, not be drought- and disease-resistant, or be coniferous.

Required width: Six feet.

Permitted materials (seating surface): All-weather recycled plastic lumber that resembles the grain and color of natural cedar wood.

Permitted materials (frame): Powder-coated steel in gloss black.

Preferred vendor and model: "Mall Bench Arched Back" by TreeTop Products of Batavia, Illinois. Said bench is illustrated below:

Alternative benches may be considered by the approving entity when the bench described in § 59-66.8C(1)(a)[4] is unavailable. In such cases, the design of alternative benches shall be generally compatible with the bench described in § 59-66.8C(1)(a)[4] to the satisfaction of the approving entity. There shall be no deviation from the width and permitted materials specified in § 59-66.8C(1)(a)[1] through § 59-66.8C(1)(a)[3].

When the calculated required number of benches results in a fractional unit greater than one, the resulting required number of benches shall be rounded to the nearest whole number. To illustrate, the requirement of 1.6 benches for a site with 140 feet of roadway frontage would be rounded upward to two benches (e.g., 140 ÷ 75 = 1.6 → 2.0), whereas the requirement of 1.33 benches for a site with 100 feet of roadway frontage would be rounded downward to one bench (e.g., 100 ÷ 75 = 1.33 → 1.0). When a fractional requirement of 1.5 benches results, the requirement would be rounded upward to two benches (e.g., 112.5 ÷ 75 = 1.5 → 2.0).

No benches shall be required for sites with less than 75 feet of roadway frontage.

Minimum capacity: Five bicycles.

Permitted materials: Powder-coated steel in gloss black.

Maximum height: 36 inches.

Preferred vendor and model: "Model D" by Urban Accessories of Tacoma, Washington. Said bicycle rack is illustrated below:

Alternative bicycle racks may be considered by the approving entity when the bicycle rack described in § 59-66.8C(2)(a)[4] is unavailable. In such cases, the design of alternative bicycle racks shall be generally compatible with the bicycle rack described in § 59-66.8C(2)(a)[4] to the satisfaction of the approving entity. There shall be no deviation from the minimum capacity, permitted materials, and maximum height specified in § 59-66.8C(2)(a)[1] through § 59-66.8C(2)(a)[3].