When proposed developments encroach into the dripline area of oak or significant sized trees, special construction techniques to allow the roots to breathe and obtain water may be required by the Director with respect to any application for a building, grading or development permit. During construction, such protection measures shall include, but not be limited to, installing a high visibility tree protection fence (minimum three (3) foot high fence with metal stakes/posts at eight (8) to ten (10) foot intervals) around the dripline(s) of a tree or trees to be preserved. All development applications, where oak or significant sized trees may be affected by development, shall include a certification by a registered civil engineer, land surveyor or licensed tree specialist attesting to the accuracy of the tree trunk and dripline locations.

As a general rule, the existing ground surface within the dripline of any oak or significant tree shall not be cut, filled, compacted or pared. Excavation adjacent to any oak or significant tree shall not be permitted where, in the judgment of the Director, material damage to the root system will result. Exceptions may be approved by the Director based on qualified consultation, at the cost of the developer, resulting in reasonable assurance that the tree will not be damaged.