Tree replacement is required where no trees exist in the tree tract, where tree canopy coverage in the tree tract is less than one hundred percent, where unhealthy, unsuitable, or hazardous trees occur within the tree tract, where gaps in the stand require replanting, or where underplanting is necessary for future stand replacement. The tree tract shall be replanted to achieve ninety percent canopy coverage within fifteen years. Replacement trees will be a minimum of 1.5 inch caliper for deciduous species and 6-7 foot tall for conifers unless otherwise recommended by the city tree protection professional. Conifers will be native to the Pacific Northwest. Deciduous tree species will be compatible with the other trees in the tract, and will provide wildlife, aesthetic, and other amenities to the tract. (Ord. 1269 §13, 2006).