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CITY OF PLEASANTON URBAN FOREST MASTER PLAN | 149 <br />ANALYSIS OF CURRENT PLANS POLICIES AND ORDINANCES <br />Table 4-2. Pleasanton Tree Establishment Details <br />Document Context Recommended Update <br />Tree <br />Planting <br />Detail 806 <br />(2) 1” Wide x 30” recycled tire rubber <br />tree tie in figure 8 pattern; 2 per tree <br />It is recommended that the rubber tree tie is secured loosely, allowing the tree to <br />sway. (Swaying at youth encourages the tree to develop a tapered trunk better <br />suited for high wind events) <br />Temporary watering basin: 4” high berm <br />x minimum 3’ diameter. (Not to be used <br />in turf areas) <br />Consider adding the following language: “Berms should be periodically expanded <br />so the full root zone is watered and can be removed when the establishment care/ <br />watering period is over.” <br />Well-developed root ball Not descriptive enough for non-specialists to discern. May be beneficial for the city <br />to have an additional detail for nursery stock standards (See Appendix T). <br />Native soil, compacted to 85% or <br />undisturbed <br />Consider clarifying that the soil filled back into the planting hole should be com- <br />pacted, but the soil beneath tree planting hole should be uncompacted and undis- <br />turbed. <br />Fertilizer tablets per specifications <br />Consider removing from city standards. A consistent supply of mulch every 2-3 <br />years is generally sufficient for nutrient provision. (ISA BMPs state that fertilizer <br />generally does not aid in establishment, and fertilizer tablets are only necessary if <br />soil tests report low nutrient levels). <br />3” layer of wood mulch, hold mulch back <br />a minimum of 3” from trunk Consider adding replenishment of mulch as needed on an annual basis. <br />Trees may require root barrier if planted <br />within 8 ft. of paved areas, subject to <br />City Landscape Architect. <br />Recommended that the city has a separate and more elaborate resource regarding <br />spacing guidelines. <br />Root <br />Barrier <br />Detail 807 <br />General Comment <br />If the city struggles with root barrier performance, it may be a function of soil <br />aeration. Tree root growth is largely dependent on availability of oxygen within <br />the soil. Trees resist growing roots deep into soil if the soil is poorly aerated. Since <br />root barriers guide roots downward, they are least effective in poorly aerated soils, <br />which are commonplace in the urban environment.