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FIGURE 1:1.5 feet 30 foot <br /> <br /> <br /> <br /> Demolition of a structure(s) with a footprint of 250 square feet <br />or greater; <br /> Construction of any accessory structures requiring a building <br />permit including but not limited to sheds greater than 200 square <br />feet, detached garages, pools, retaining walls with a height of <br />four feet or greater; or <br /> Clearing, grading, or other site preparation work performed prior <br />to undertaking any of the above. <br />CERTIFICATE OF <br />EXEMPTION: Formal permission granted to proceed with building activity without <br />the need for a tree permit. <br />CERTIFIED ARBORIST: An arborist certified by the Massachusetts Arborists <br />Association or International Society of Arboriculture, or any <br />successor organization. <br />CRITICAL ROOT ZONE <br />(CRZ): The minimum area beneath the tree canopy of a tree which must be <br />left undisturbed in order to preserve a sufficient root mass to give a <br />tree a reasonable chance of survival. The CRZ is represented by a <br />circle centering on the tree’s trunk and extending outwards towards <br />the tree’s drip line. The minimum radius of the CRZ shall be <br />determined by multiplying the tree’s diameter at breast height in <br />inches by 18 (1.5 feet per inch DBH). See Figure 1 below. <br /> <br />Example: A tree with a diameter at <br />breast height of 20 inches shall have a <br />CRZ of 360 inches or 30’. <br />(20” x 18” = 360”) <br /> <br /> <br /> <br />7 <br /> <br /> <br />