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Sam Oakley <br />231 Old Bernal Avenue Tree Inventory, Valuation, and Construction Guidelines <br />9/13/2024 4 <br /> <br /> <br />PO BOX 2412 <br />PISMO BEACH, CA 93448 <br /> <br /> (415) 407-6995 <br />SAM@OAKLEYGROUP.ORG <br />WWW.OAKLEYGROUP.ORG <br /> <br /> <br /> <br />Condition: each tree was assigned a value between 0% and 100% based on health and <br />structural conditions observed on August 15, 2017. Observations were recorded as poor, <br />fair, moderate, good, and excellent. The observations were subsequently converted to a <br />rating, as noted above (poor = 1, fair = 2, moderate = 3, good = 4, and excellent = 5; see <br />Exhibit 2 for condition ratings). <br /> <br />Base Value was assumed to be $172.73 per individual for a 2.09-inch DBH replacement <br />tree installed. This value is taken as an industry standard for the local region and is twice <br />the wholesale cost. For this report, the value derived approximates an individual tree’s <br />value and do not represent absolute values based on the inherent subjectivity of an <br />appraisal. <br /> <br />Tree Value <br /> <br />The values of individuals can be found in Exhibit 2. <br /> <br /> <br />Specific Construction Impacts <br /> <br />Perimeter screen trees – There are trees growing along the property line. There are no <br />impacts anticipated to these trees aside from minor pruning (<5% of total crown). <br />Trenching and digging in the soil near trees can cut roots, and this can damage the tree <br />resulting in tree decline or the tree falling over. This can cause liability and safety <br />concerns. Root pruning is more injurious to old mature trees than it is for younger more <br />vigorous trees. Cutting roots greater than about one inch diameter during trenching and <br />digging can mean problems for the tree. In some cases, roots of one to three inches <br />diameter represent the major structural roots holding the tree upright. <br />The impact from pruning roots depends on several factors. Damage typically increases <br />with more cuts, bigger cuts, and cuts made closer to the trunk. Root pruning, trenching, <br />and other construction activities close to the trunk result in more injury on shallow, <br />compacted soils or on soils that drain poorly than on well drained soils. This is due to the <br />shallow roots common on sites with shallow soils or high-water table. Trees that are <br />leaning are poor candidates for root pruning. <br />Factors affecting response of trees to root pruning: <br />• root size: larger roots may generate few new roots <br />• number of cut roots: more roots cut means more tree stress <br />Page 338 of 373