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shall be maintained to provide nesting and foraging habitat and the protection of waterway quality. The minimum width of said open space shall be one-hundred (100) feet, measured from the mean high water level of the natural bank or fifty (50) feet back from the existing riparian habitat, whichever is greater. If the project is submitted for a full application, the open space for the existing riparian habitat must be shown on the Tentative Map. Oak Trees on Property Along the western boundary of the site are several large oak trees. Development Title section 9-110.4 defines the various classifications of oak trees as follows: • "Heritage oak tree" means a native oak tree that has a single trunk diameter of thirty-two (32) inches or greater measured at four and one-half (4 '/) feet above the average ground elevation of the tree. • "Historical tree" means any tree or group of trees given special recognition because of the size, age, location, or history. Designation of historical trees shall be made by the Planning Commission following a public hearing. • "Native oak tree" means a valley oak (Quercus lobata) with a trunk diameter of six (6) inches to less than thirty-two (32) inches for a single trunk tree, or a combined trunk diameter of eight (8) inches or greater for a multi-trunk tree, measured four and on-half (4 '/z) feet above the average elevation of the tree; or an interior live oak (Quercus wislizenii), California live oak (Quercus agrifolia), or blue oak (Quercus douglasii) with a trunk diameter of four (4) inches to less than thirty-two (32) inches for a single trunk tree, or a combined trunk diameter of six (6) inches or greater for a multi-trunk tree, measured four and one-half (4 ''/z) feet above the average ground elevation of the tree. If the project is submitted for a full application, oak trees located on the site will need to be individually delineated on the tentative map, including the diameter of the trees. The removal of a Heritage Oak or Historical Tree shall not be permitted unless one or more of the following situations exists: (Development Title Section 9-1505.3[a]) 1) That the removal is in the public interest, 2) That the tree interferes with an existing structure, utility service, or road, and no reasonable alternative exists to correct the interference other than removal of the tree; 3) That removal is necessitated because the tree is endangering another plant in the area with infection or infestation, 4) The removal is necessitated because the tree interferes with the maintenance of flood control facilities. Development Title Section 9-1505.3[b] states that removal of a Native Oak Tree shall be permitted subject to an approved Improvement Plan application processed by Staff Review procedure. Replacement of any tree removed under this subsection shall be as specified in Section 9-1505.4. If any oak trees require removal because of the proposed project, they shall be replaced as follows: (Development Title Section 9-1505.4) 2