APPENDICES - Laserfiche WebLink

How the Master Plan for the Downtown Parks and Trails System Addresses Trees Goal/Policy Section Relation to UFMP streetscape irrigation maintenance, street tree planting and water and open space maintenance. City of Pleasanton Design Guidelines Pleasanton applies a combination of landscape design requirements through conditions of approval on all projects that come through the City’s Planning department, through the Tree Preservation Ordinance (Ch. 17.16), Cal Green Building Code requirements, and through requirements for certain development projects to complete wildfire management plans. . While the Pleasanton does not have one standard document with all landscape design standards, the City does have a set of Tree Establishment Details which are discussed below in Table 4-2. Standard Details: The below table summarizes where Pleasanton’s details are not in compliance with ANSI standards and ISA best management practices. Table M-5. Pleasanton Tree Establishment Details Document Context Recommended Update Tree Planting Detail 806 (2) 1” Wide x 30” recycled tire rubber tree tie in figure 8 pattern; 2 per tree It is recommended that the rubber tree tie is secured loosely, allowing the tree to sway. (Swaying at youth encourages the tree to develop a tapered trunk better suited for high wind events) Temporary watering basin: 4” high berm x minimum 3’ diameter. (Not to be used in turf areas) Consider adding the following language: “Berms should be periodically expanded so the full root zone is watered and can be removed when the establishment care/watering period is over.” Well-developed root ball Not descriptive enough for non-specialists to discern. May be beneficial for the city to have an additional detail for nursery stock standards (See Appendix J). Native soil, compacted to 85% or undisturbed Consider clarifying that the soil filled back into the planting hole should be compacted, but the soil beneath tree planting hole should be uncompacted and undisturbed. Fertilizer tablets per specifications Consider removing from city standards. A consistent supply of mulch every 2-3 years is generally sufficient for nutrient provision. (ISA BMPs state that fertilizer generally does not aid in establishment, and fertilizer tablets are only necessary if soil tests report low nutrient levels). 3” layer of wood mulch, hold mulch back a minimum of 3” from trunk Consider adding replenishment of mulch as needed on an annual basis. Trees may require root barrier if planted within 8 ft. of paved areas, subject to City Landscape Architect. Recommended that the city has a separate and more elaborate resource regarding spacing guidelines. Root Barrier Detail 807 General Comment If the city struggles with root barrier performance, it may be a function of soil aeration. Tree root growth is largely dependent on availability of oxygen within the soil. Trees resist growing roots deep into soil if the soil is poorly aerated. Since root barriers guide roots downward, they are least effective in poorly aerated