16.12.050 Street trees.
Requirements for street tree planting strips are provided in Public Facilities Standards, Section 16.12.060. Planting of unimproved streets shall be deferred until the construction of curbs and sidewalks. Street trees shall conform to the following standards and guidelines.
1. Growth Characteristics: Trees shall be selected based on growth characteristics and site conditions, including available space, overhead clearance, soil conditions, drought tolerance exposure, and desired color and appearance. The following should guide tree selection:
a. Provide a broad canopy where shade is desired.
b. Use low-growing trees for spaces under utility wires.
c. Select trees which can be “limbed-up” where vision clearance is a concern.
d. Use narrow or “columnar” trees where awnings or other building features limit growth, or where greater visibility is desired between buildings and the street.
e. Use species with similar growth characteristics on the same block for design continuity.
f. Avoid using trees that are susceptible to insect damage, and avoid using trees that produce excessive seeds or fruit.
g. Select trees that are well-adapted to the environment, including soil, wind, sun exposure, and exhaust. Drought-resistant trees should be used in areas with sandy or rocky soil or areas without irrigation.
h. Select trees for their seasonal color, as desired.
i. Use deciduous trees for summer shade and winter sun.
2. Caliper Size: The minimum caliper size at planting shall be (two) 2 inches, based on the American Association of Nurserymen Standards.
3. Spacing and Location: Street trees shall be planted within existing and proposed planting strips, and in sidewalk tree wells on streets without planting strips. Street tree spacing shall be based upon the type of tree(s) selected and the canopy size at maturity. In general, trees shall be spaced no more than thirty (30) feet apart, except where planting a tree would conflict with existing trees, retaining walls, utilities, and similar physical barriers.
4. Soil Preparation, Planting and Care: The developer shall be responsible for planting street trees, including soil preparation, ground cover material, staking, and temporary irrigation after planting thereafter or until the lot has sold and the responsibility is transferred to the property owner. The developer shall also be responsible for tree care (pruning, watering, fertilization, and replacement as necessary) after planting.
5. Assurances: The City shall require the developer to provide a performance and maintenance bond in an amount determined by the City Engineer, to ensure the planting of the tree(s) and care during the first two (2) years after planting.
6. Street Tree List: A recommended street tree list is available at the Planning Office.