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