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(2)(a) The landscape plan shall provide for the planting <br />or replacement of trees on the site to the extent that, after <br />20 years, minimum tree canopy cover percentages will be <br />provided as specified in the Table 36.1. <br /> <br /> (b) Canopy cover calculations shall be made based upon <br />the data provided in the most recent edition of "Trees and <br />Shrubs for Virginia Landscapes, Volume 1, Commonly Used <br />Plants"~ of the Virginia Nurserymen's Association and the <br />"Handbook of Landscape Tree Cultivars", 1989, by the <br />Horticultural Research Institute Foundation. If a range of <br />distance is provided for the width of a tree~ the lower end of <br />the range shall be used. In cases of conflict between the two <br />references, the larger width specification shall be used. The <br />determined width shall then be divided by two to determine the <br />radius of the tree canopy. This radius shall be multiplied by <br />two-thirds to obtain the radius of the tree at 20 years. The <br />area of the canopy cover_of the tree shall be calculated using <br />the 20 year radius. If no data is provided in either of the <br />two references for a tree proposed to be used, canopy cover of <br />the proposed tree and the reference source used to calculate <br />that canopy cover shall be indicated on the landscape plan. <br /> <br /> (3) The area of a site to be used in calculating canopy <br />cover shall be the plot area as defined in Section 40-31 of <br />the Zoning Ordinance. <br /> <br /> (4)(a) Trees shall be selected from those listed in the <br />"Landscape Planting and Protection Manual, Portsmouth, <br />Virginia", which may be amended as necessary by the City <br />Manager or his designee. Substitutions using trees not on the <br />list may be made with the approval of the Director of Parks <br />and Recreation or his designee. No tree from the list of <br />non-acceptable trees may be used. <br /> <br /> (b) Small trees with single stems must have'a caliper of <br />one and one-half inches at time of planting. Multi-stem small <br />trees must be a minimum of five feet in height at time of <br />planting. Medium and large trees must have a minimum caliper <br /> <br /> <br />