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maintenance of small trees. The School District has stated their commitment to maintain the trees on the school sites. B. COST EFFECTIVENESS This project will maximize the number of trees planted to provide the greatest potential for long-term carbon dioxide uptake at the least cost. This project will utilize a realistic blend of City and School District personnel, and will involve volunteer organizations and landscape contractors to achieve the planting of 652 trees. 1. Tree Species - The following criteria was used to determine those trees most suitable for the project. Trees will also be selected based on specific site opportunities and constraints. • Trees with high ratios of leaf circumference to area and surface to volume. • Trees with abundant branch and twig structure for particulate removal. • Drought tolerance. • Proven tolerance to the City of San Leandro's urban environment. This will give us trees with the highest probability of maximum metabolic rates and therefore the greatest reduction of vehicular emissions. • Trees with relatively low maintenance requirements (i.e., pruning, diseases, pests, etc.). • For street trees, large to medium tree species that will cause minimum pavement damage in the planter space available, thereby minimizing the need for future removal and sidewalk repairs. 2. Tree size - Table C outlines the trees sizes and quantities for the proposed project. TABLE C Tree Sizes Container size Quantity 24"box 38 15 gallon 624 TOTAL 652 24-inch box trees are only proposed for Doolittle Drive where they are justified because of the difficult growing conditions and the importance of this planting. Page 9