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0 <br />(b) As used herein. "tree canopy" or "tree cover" shall <br />(c) Existing trees infested with disease or insects or <br />structurally damaged to the extent that they pose a hazard to <br />persons or property, or to the health of other trees on site, shall <br />not be included to meet the tree cover requirements. <br />or the Planning Commission in the following circumstances: <br />(1) To allow for the reasonable development of areas <br />devoid of woody materials, dedicated school sites, playing fields <br />and other nonwooded recreation areas, and other facilities and uses <br />of a similar nature. <br />(2) To allow for the preservation of wetlands. <br />(3) When strict application of the requirements would <br />result in unnecessary or unreasonable hardship to the developer. <br />• Sec. 31-199.3 Tree planting standards. <br />All trees to be planted shall meet the specifications of the <br />American Association of Nurserymen and shall be at least two inches <br />in diameter. The planting of trees shall be done in accordance <br />with either the standardized landscape specifications jointly <br />specifications of the Virginia Department of Transportation. <br />Sec. 31-199.4. Tree species: required variety. <br />(a) Trees planted to satisfy the tree coverage requirements <br />Development. <br />(b) To curtail the spread of disease or insect infestation <br />• required trees shall be of a single species. <br />