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<br />12 <br /> <br />If Trenching is unavoidable, the following distances should be maintained: <br /> <br /> <br />Alternative Methods for Hardscape to Prevent Root Cutting <br />The following remedies should be considered as an alternative to severing tree roots: <br /> <br />1. Grinding a raised walkway or concrete pad <br />2. Ramping the walkway surface over the roots or lifted slab with pliable paving <br />3. Re-routing the walkway around tree roots <br />4. Permeable paving materials (e.g., decomposed granite), interlocking pavers, or flagstone <br />walkways on sand foundations <br />5. Root bridging <br /> <br />D. Tree Maintenance During Construction <br />Providing adequate maintenance can mitigate stressful changes that occur to a tree ’s <br />environment during construction. To remain vigorous, the tree needs to maintain stored <br />carbohydrates and preserve the effectiveness of its growth regulators. It is recommended that as <br />part of large projects the contractor or developer include and provide: <br /> <br />Irrigation <br />Providing supplemental irrigation for trees under water stress may be the single most important <br />treatment. Irrigation should be designed to wet the soil within the TPZ to the depth of the root <br />zone and to replace that water once it is depleted. Light, frequent irrigation should be avoided. <br />Create a six-inch berm around trees at the edge of the TPZ and fill with no more than six inches of <br />mulch. Fill the basin with water. Irrigation should wet the top two to three feet of soil to replicate <br />similar volumes and normal seasonal distribution. <br /> <br />Soil Compaction Mitigation <br />To prevent negligent encroachment into the TPZ, trees to be preserved during construction must <br />always have the specified type of protection fences in place. Removal of fences, even temporarily, <br />to allow deliveries or equipment access is not allowed unless approved by the Certified Arborist <br />and a Root Buffer is installed. The Root Buffer components: mulch, gravel and plywood, must be <br />maintained continually to assure its effectiveness against soil Compaction. <br /> <br />Dust Control <br />During periods of extended drought, wind or grading, trunks, limbs and foliage should be sprayed <br />with water to remove accumulated construction dust. <br />TRUNK DIAMETER (measured at 4.5 feet above natu- <br />ral grade) <br />DISTANCE FROM OF THE TRUNK <br />ON BOTH SIDES <br />Up to 9 inches 5 feet <br />10-14 inches 10 feet <br />15-19 inches 12 feet <br />over 19 inches 15 feet <br />Section 4: Protection of Trees <br />During Construction (continued)