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undisturbed until the young mature and leave the nest. The nest material will then be moved to a suitable, permanent natural area of the site as directed by the biologist. 14. Roosting Bats The applicant shall retain a qualified biologist to conduct a pre construction bat roost survey at least 15 days before the onset of construction to verify the presence of an active bat roost. A combination of visual surveys and acoustic detection equipment will be used at each potential roost from one hour before sunset, to two hours after sunset. If an active bat roost is observed, the applicant shall establish and maintain a buffer area around the site until earthmoving activities are completed or until September. Failure to maintain the buffer area shall result in the immediate issuance of a stop work order and cessation of activity. 15. Big Tarplant The applicant shall retain a qualified biologist to conduct a pre construction survey at least 15 days before the onset of construction to verify the presence of the big tarplant plant species on the individual building sites. If identified as present on the building sites, the building site will be subject to a prepared mitigation plan designed to preserve and protect the affected species from construction related impacts. 16. The statements in Conditions 10 through 15 shall be added to all site plans, grading plans, and /or improvement plans covering this development and /or the individual building sites. These same requirements shall apply to the individual home building sites and shall be added to the design guidelines covering this development. Existing Trees 17. To mitigate the potential significant impacts on trees from the site preparation and development activities, the applicant shall prepare and submit the following to the Planning Division for review and approval before the approval of the parcel map: a. An updated tree analysis based on the "Revised Preliminary Tree Report, 4100 Foothill Road, Pleasanton, California dated January 2010, prepared by Hort Science, Inc., shall implement the applicable provisions specified in the City of Pleasanton's Tree Preservation Ordinance, and shall include, but is not limited to, the following: A map based on the parcel design showing the tree locations superimposed over the lotting plan and grading plan including all cut/fill areas showing the trees to remain, to be removed, and the trees that may be impacted by grading. A listing of every tree covered in the above stated map stating its species, caliper, health, significance, and valuation. The 10 -foot grading setback lines from the canopy areas of the trees to be preserved and the trees that may be impacted from development that will also function as the location for fence lines to protect these trees. The type of fencing that will be used to fence the trees. b. An Oak Tree Mitigation Monitoring and Implementation Plan will include monitoring, success criteria, and contingency measures. c. The following statements addressing tree protection: 4