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David L, Bobby, Registered Consulting Arhorisi July 8, 2013 <br /> trees' trunks. The trench should be dug to the required subgrade depth (including for <br /> base materials) to a distance of five to ten feet beyond a TPZ, and any roots <br /> encountered with diameters of one-inch and greater shall be cleanly severed by hand <br /> (at 90° to the direction of root growth) against the tree side of the trench. All soil <br /> beyond the trench (i.e. away from the tree) can then be mechanically excavated using <br /> heavy equipment. Alternatively, the use of a stump grinder could be utilized <br /> precisely where a curb/gutter and any overcut(12" max) will be established. <br /> 20. Except where mentioned in the prior recommendation, trenching and excavation <br /> should not damage, scrape or gouge roots two inches and greater in diameter. In the <br /> event these roots are encountered, the project arborist should be notified, and the <br /> root(s) should either be covered with soil or wrapped in moistened burlap within a few <br /> hours of exposure. If burlap is used, it should remain continually moist until the trench <br /> is backfilled. <br /> 21. During trenching, roots encountered that have diameters less than two inches and <br /> require removal can be cleanly severed at a 90-degree angle to the direction of root <br /> growth. In doing so, sharp cutting tools (e.g. loppers or handsaw) shall be used, and <br /> the cut should occur against the tree side of the trench. <br /> 22. Digging any holes for piers shall be manually performed, and in the event a root or <br /> two inches and greater in diameter is encountered during the process, the hole should <br /> be shifted over by 12 inches and the process repeated. Before doing so, the root and <br /> hole should be reviewed by the project arborist. <br /> 23. Supplemental water should be supplied to the coast redwoods during the dry months <br /> of the year (e.g. March thru November) at approximate rates of ten gallons per inch of <br /> trunk diameter every three to four weeks. For this site, I suggest the water is applied <br /> either through flooding the inside of a 12-inch tall berm formed around the canopy <br /> perimeter (or as close as possible to the canopy edge), or through deep-root injection. <br /> Water for all other trees should continue being applied to their root areas throughout <br /> construction. <br /> 3192 Santa Rita Road, Pleasanton Page 8 of 10 <br /> Mr.Joe.Vgin°e n, .x.57 Consulting <br />