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8.0. PRIORITY MAINTENANCE <br /> Definition of priority maintenance: Priority maintenance <br /> includes the following: <br /> a. Emergency work - Tree work requiring immediate action for <br /> human safety and property protection. <br /> b. Priority Pruning - Safety pruning identified in a hazard <br /> tree survey or by citizen service request. <br /> c. Removals -- - Trees that are dead or dying or hazardous <br /> beyond repair. <br /> 8.1 Policy Recommendation: • Vancouver's - current policy of <br /> immediate correction of any tree hazard that endangers life <br /> or property should be maintained. <br /> Emergency priority tree maintenance should be handled <br /> immediately. <br /> a- = Non- emergency ••priority 'maintenance 'should'' be handled <br /> within a-year - . -This work be' performed `by a two person <br /> • •• crew thattsysteinatrcally` works in each. of " the management areas <br /> of the city once per year. '' <br /> 8.2 Policy Recommendation: Hazardous tree.conditions should be <br /> :proactively identified and corrected to reduce liability. <br /> Other municipalities have found`that an effective method <br /> • of accomplishing this objective is through an annual hazard <br /> tree survey. Every street in the city should be surveyed each <br /> year for dead trees requiring removal and for trees with <br /> hazardous conditions (dead or hanging limbs that pose <br /> potential harm to citizens or damage .to' property should they <br /> fall). The work identified in the hazard tree survey should <br /> be scheduled for completion by the priority maintenance crew. <br /> 9.0 TREE PLANTING <br /> 9.1 Policy Recommendation: The street - tree population should be <br /> managed so that no more than 20 percent of the population <br /> consists of one tree genus and no more than 10 .percent <br /> consists of one tree species or cultivar. <br /> The genus Prunus (including the flowering cherries and <br /> flowering plums) comprises about 36 percent of the street tree <br /> population. <br /> Clearwing moth borer problems were observed on the <br /> maturing cherries and plums by ACRT in October 1988. This <br /> pest, if allowed to develop to epidemic proportions, could <br /> prove as devastating as the Dutch elm disease on the American <br /> elms in other North American cities. <br /> -7- <br />