Environment & Sustainability | Trees
sites, the director may also require that signs requesting subcontractor cooperation and compliance with tree protection standards be posted at site entrances. d. Where tree protection areas are remote from areas of land disturbance, and where approved by the director, alternative forms of tree protection may be used in lieu of tree protection barriers, provided that protected trees are completely surrounded with continuous rope or flagging and are accompanied by “Tree Save Area – Keep Out” signs. e. Native understory trees, shrubs and other vegetation shall be protected within the designated tree protection area. 6. Preventative Measures. In addition to the above minimum protection measures, the applicant shall provide a plan from a certified arborist to the City to employ the following preventative measures, consistent with best management practices for maintaining the health of the tree with the permit application for all protected trees within 50’ of planned construction activities. For best management practices that require action they shall be implemented at least 3 months prior to the start of construction:
d. Fertilizer and similar measures shall be applied to enhance the vigor of trees prior to construction with an emphasis on stressed trees;
e. Use soil amendments and soil aeration in planting areas;
f. Apply mulch over tree drip line areas; and
g. Ensuring proper water availability before, during and after construction. 7. Alternative Methods. The director may approve the use of alternative tree protection and/or preventative techniques if a protected tree will be protected to an equal or greater degree than through the techniques listed above.
J. Tree replacement standards
1. Replacement Required. Any significant tree lawfully removed pursuant to SDC 21.03.060F., Removal standards, or SDC 21.03.060G., Retention standards, shall be subject to the following replacement requirements:
a. Each landmark tree shall be replaced by three new trees;
b. Each heritage tree shall be replaced by two new trees;
c. Each significant tree shall be replaced by one new tree;
a. Significant trees shall not be topped;
d. Replacement coniferous trees shall be at least eight feet in height; e. Replacement deciduous trees shall be at least two and one-half inches in diameter (DBH); f. Replacement trees shall be primarily native species to Washington in order to restore and enhance a site as
b. Excessive pruning shall not be allowed unless necessary to protect life and property; c. Visible deadwood on trees to be protected or relocated shall be pruned;
172 | Title 21: Sammamish Development Code
Effective | January 1, 2022
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