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Prior to the commencement of construction including any alteration of existing topography, a sturdy chain -link fence shall be installed a minimum of 10 feet beyond the tree driplines. No material storage, vehicle parking, etc., may occur inside the fence. The dripline shall not be altered in any way so as to increase the encroachment for construction. No excavation, grading, drainage, and leveling shall occur within the dripline of any preserved tree unless approved by the Planning Division, the City Engineer, and the consulting arborist. No disposal or depositing of oil, gasoline, chemicals, or other harmful materials is allowed within the root protection zone of the preserved trees or in drainage channels, swales, or areas that may lead to the dripline. No wires, signs, or ropes may be attached to any tree that is part of this development including the permanent open space area. The CC &Rs and the design guidelines covering Lots 1 through 4 shall include the above statements in their wording. 18. The applicant shall post cash, letter of credit, or other security satisfactory to the Planning Division in the amount of the valuation of each tree identified in the plan should any work, utilities or otherwise, be conducted within an area in which potential impacts may be anticipated. This cash bond or security shall be retained for two years following acceptance of public improvements or completion of construction, whichever is later, and shall be forfeited if the trees are destroyed or substantially damaged. In the event any trees are destroyed or substantially damaged, an arborists' assessment, at the developer's expense, shall be required to determine the value of the damage or loss and the resultant sum paid to the City's Urban Forestry Fund or used for the suitable mitigation by planting specimen trees on -site, as determined by the Planning Division. 19. Each building envelope is subject to site specific design review where the placement of structures will be reviewed towards tree preservation. If a native /non- native tree, heritage /non heritage size within the building envelope is proposed to be removed, to compensate for the habitat values lost from the removal of heritage -size and non heritage size trees due to development, the applicant shall replace these trees removed with development, with a combination of 15- gallon and 24 -inch box -size native specimen trees at a replacement ratio and locations to be determined by the Planning Division and the City Landscape Architect. If a native /non- native tree, heritage /non heritage size within the building envelope is removed for site development, the following mitigation program shall be followed: Plant three, 24 -inch box -size native specimen trees for each Heritage tree to be removed and one, 15- gallon -size native specimen tree for each non Heritage tree to be removed. Pay to the City's Urban Forestry Fund a sum not to exceed the estimated value of the tree to be removed provided with the design application(s) for the site. The replacement trees shall be shown on the construction drawings to the satisfaction of the Planning Division and shall be located in the areas A -1 through A- 5, below, to screen the homes from view and to "fill" the current gaps between existing tree groups. 5