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4. Mulching. During the establishment period a minimum 3 ft. x 3 ft. planting area around each tree shall be maintained with a layer of bark mulch 2 -4 inches in depth. The mulch shall be kept at least 2 inches away from the trunk of the tree, and the mulched planting area around the tree shall be kept free of weeds. 5. Pruning. 5.1 Dead, broken or split branches shall be pruned at the time of planting. 5.2 Trees shall be pruned to remove branches that are crossing, damaged, diseased, broken, or have included bark. 5.3 Trees shall not be topped or reduced in height without prior approval of the Urban Forester. 5.4 Trees shall be pruned so at least two thirds of the tree's height is canopy with one third of the height being the trunk. 5.5 The lower limbs shall be pruned off or tipped back to meet compliance with the requirements for clearance over sidewalks and streets as contained in the Eugene Code, 1971. 5.6 Initial structural pruning shall be performed at the end of the three year establishment period. A strong scaffold branch structure shall be developed by pruning to select the primary scaffold branches. 5.7 Pruning shall be performed according to the approved Urban Forestry pruning standards and specifications. 6. Tree Replacement. Any tree that falls under one or more of the following conditions shall be replaced by the developer during the next approved planting season after receipt of the notice of the need to replace the tree. 6.1 Dead tree. This shall include any tree that has no live growth originating in the scaffolding branches. 6.2 Stressed tree. This shall include any tree that has lost a minimum of 50% of its total foliage or, has a reduction of 50% of normal leaf size for that species. 6.3 Non - approved tree. This shall include any variety of tree that is not listed on the Approved Street Tree Species List, or that has not been approved by the Urban Forester. Street Tree Plan H : \02StreetTreePlan- FullRules.wpd