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8.A <br /> Page 96 <br /> n <br /> 1��� Walter Levison ' `�� <br /> � CONSULTING ARBORIST -° •° •- - • <br /> PNW-ISA Tree Risk Assessor #593 ASCA Re istered Consultin Arborist #401 ISA Certified Arborisl #WC-3172 <br /> The tree exhibits two codominant mainstems, one vertical over 448 Saint Francis, and <br /> one with a severe lean approximating 45 degrees off vertical, which extends out over the <br /> neighbor's driveway. It exhibits good live twig density and extension. <br /> Tree #3 stands 30 feef in height with a total spread of 35 feet. It rates out with a health <br /> of 80% and a structure of 40%, for an overatl condition rating of 55°/a or "Fai�'. <br /> The overall condition raiing was significantly downgraded due to the structural issue of <br /> the codominant mainstem lean ('structure' being totally distinct and separate from <br /> 'health'). 45 degrees is the threshold angle for removal of a tree (Smiley, Bartlett Tree <br /> Research Lab). In this case, since we have one vertical and one leaning stem, the <br /> leaner would be removed if the tree were to be preserved. The tree does require <br /> removal, since the tension side (448 St. Francis side) of the root system will be <br /> destroyed during foundation footing excavation for the proposed site plan. <br /> This species (Pinus pinea) is well known for dropping codominant mainstems and large <br /> diameter limbs due to its tendency to form tight forks. This specimen does exhibit a <br /> typical Italian stone pine tight fork with bark inclusion in the crotch (see photo in section <br /> 9.0), and splitout of the endweiaht-heavv leaning stem would be likely if it were not <br /> removed outright. If this tree was to be retained in a non-development rype situation, I <br /> woufd remove the entire leaning stem at the fork/crotch at 6 feet above grade. Note that <br /> in terms of tree risk, this specimen currently has an "elevated risk of failure". <br /> 2.0 Assignment <br /> I was requested by the owner to prepare a tree protection plan and appraisal (valuation) for <br /> three (3) front yard trees at 448 Saint Francis in relation to the proposed site plan for <br /> residential renovation. The appraisal is a non-standard request which was required per a <br /> letter dated 8l27J2010 ftom the project planner Chris Rogers, Assistant Planner, City of <br /> Redwood City. <br /> This report contains tree data in section 1.0 above, a free map below showing the trees in <br /> relation to proposed work, photographs of the trees, recommendations for tree maintenance <br /> and protection based on arboriculture Best Management Practices (BMP), and an attached <br /> appraisal worksheet showing with transparency the data used to determine the trees' values <br /> per the trunk formula method (TFM) as outlined in Guide for Plant Appraisal 8`" edition and <br /> WC-ISA "Species Classification and Group AssignmenY' (2004 edition). <br /> 4 of 14 <br /> Site Address: 448 Saint Francis Version: 08272010 <br /> Walter Levison O All Rights Reserved <br /> Registered Member, American Society of Cansulting Arborists and Member oF the Internadanal Sociery of Arboriculture <br /> Phone/Fax (650) 697-0990 <br />