A. Physical Constraints Review Permit. A Physical Constraints Review Permit is required for the following activities in the land classifications in section 18.3.10.060.
1. Alteration of Land. The alteration of the land surface by any of the following activities in areas identified as Flood Plain Corridor Land, Hillside Land, or Severe Constraint Land.
a. Earth-moving activities such as grading, filling, stripping, or cutting involving more than 20 cubic yards on any lot, or earth-moving activity disturbing a surface area greater than 1000 square feet on any lot.
b. Construction of a building, road, driveway, parking area, or other structure; except that additions to existing buildings of less than 300 square feet to the existing building footprint shall not be considered development for section 18.3.10.090 Development Standards for Hillside Lands.
c. Culverting or diversion of any stream designated by chapter 18.3.10.
2. Special Flood Hazard Area. All activities located within an area of special flood hazard are subject to the provisions for a Development Permit under AMC 15.10 Flood Damage and Prevention Regulations.
3. Tree Removal.
a. Flood Plain Corridor Land. The following tree removal activities in areas identified as Flood Plain Corridor Land. See also, subsection 18.3.11.050.A.1 for tree pruning and removal standards in water resource protection zones.
i. The removal of three or more living trees of over six inches DBH, or the removal of five percent of the total number of living or dead trees over six inches DBH, whichever is greater, on any lot within five year period, or any form of commercial logging.
ii. The removal of one or more living conifers greater than two feet DBH, or living broadleaf trees greater than one foot DBH.
b. Hillside Land and Severe Constraints Land. Tree removal, in areas identified as Hillside Land and Severe Constraint Land, except that a permit need not be obtained for tree removal that is not associated with development, and done for the purposes of wildfire management and carried out in accord with a Fire Prevention and Control Plan approved by the Fire Chief.
c. Commercial Logging. Commercial logging in areas identified as Flood Plain Corridor Land, Hillside Land, or Severe Constraint Land.
B. The land classifications in section 18.3.10.060 determine the development standards that are applicable to property. Where this chapter and any other ordinances (e.g., 18.3.11 Water Resources Protection Overlay), easement, covenant, or deed restriction conflict or overlap, whichever imposes the more stringent restrictions shall prevail.