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Ordinance No. 2181 Page 8 of 22 equipment shall be maintained in good mechanical condition so as to minimize noise and air pollution from a faulty engine, drive train, or other components. No muffler or exhaust system shall be equipped with cutout, bypass, or similar device intended to thwart quieting. f. Dust control best management practices, as approved by the City Engineer, shall be followed at all times during grading and construction operations. Such measures may include watering of exposed surfaces twice a day, and more frequent watering when wind speeds exceed 15 mph; covering of stockpiled earth; and covering of trucks hauling dirt if windy conditions prevail. Failure to keep dust under control may result in the stoppage of all work until a modified plan acceptable to the City Engineer is approved and implemented. g. Except for security trailers staffed by licensed security personnel, at no time shall campers, trailers, motor homes, or any other vehicle be used as living or sleeping quarters on the construction site. All such vehicles shall be removed from the site at the end of each workday. Construction trailers shall be allowed to be placed on the project site for daily administration/coordination purposes during the construction period. Landscape Architecture Division 23. The developer shall comply with the recommendations of the Arborist Report dated September 5, 2017, on file with the Planning Division. Details of the recommendations shall be submitted in conjunction with the plans submitted for issuance of building permits and shall be subject to review and approval by the Director of Community Development prior to issuance of building permits for the project. 24. The final landscape and irrigation plan shall be revised to remove the cobble underneath all existing oak trees. The final ground material shall be reviewed and approved by the City Landscape Architect. 25. A final landscape plan and irrigation plan shall be submitted to and approved by the Director of Community Development as part of the building permit plans prior to issuance of a building permit. Said landscape and irrigation plan shall be consistent with the approved landscape plan plus any conditions of approval, and shall be detailed in terms of species, location, size, quantities, and spacing. Plant species shall be of a drought-tolerant nature with an irrigation system that maximizes water conservation throughout the development (e.g., drip system). The irrigation system shall meet all requirements for compatibility with recycled water supply per City of Pleasanton Recycled Water Standards. 26. The project developer shall post cash, letter of credit, or other security satisfactory to the Director of Community Development in the amount of $5,000 for each tree required to be preserved (including the City street trees along the project frontage), up to a maximum of $25,000. This cash bond or security shall be retained for one year following completion of construction and shall be forfeited if the trees are destroyed or substantially damaged. No trees shall be removed other than those specifically designated for removal on the approved plans. 27. All trees used in landscaping shall be a minimum of twenty-four (24) inch box-size and all shrubs shall be a minimum of five (5) gallons.