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Hydrology and Water Quality 71. To mitigate the creation of new impervious surfaces that would increase the amount and/or the intensity of runoff, potentially exacerbating existing downstream flooding problems and/or causing hydro modification impacts, the project developer (for the infrastructure) and/or lot owner/contractor (for the individual lots) shall pay the applicable regional drainage fees to the Alameda Water Quality and Flood Control District, Zone 7, at the final map for impervious road surfaces (project developer) and with each building permit for lot development (lot owner/contractor). (Mitigation Measure H-1-b of the FEIR.) Open Space Area 72. The property owner shall dedicate in fee title to the City of Pleasanton or to another public entity selected by the City the open space area surrounding Lots 1 through 51 with recordation of the first final subdivision map. The open space area shall be subject to an open space/conservation easement granted to the Tri- Valley Conservancy or other organization authorized to hold open space/conservation easements, and shall be in accordance with the requirements of the Development Agreement. 73. Before the sale of the fifth lot, the project developer shall install local and regional public trails in the open space area generally following the alignments shown in Exhibit I, dated March 2007 in accordance with the requirements of the Development Agreement. The location of the trails shall be subject to the review and approval of the Parks and Recreation Commission and Trails Ad-Hoc Committee. The trails' locations shall avoid the environmentally sensitive areas designated on the approved mitigation monitoring plans. 74. Before the sale of the fifth lot, the project developer shall install a public trail staging area in the open space area, generally located in the area by the proposed City water tank, in accordance with the requirements of the Development Agreement. The design and operation of the staging area shall include measures to secure the area from sundown to sunrise. The design, operation, and location of the trail staging area shall be subject to the review and approval of the Parks and Recreation Commission and Trails Ad-Hoc Committee. Phasing 75. The project shall be allowed to be phased by the processing of phased final maps. Any proposed phasing of this development shall be depicted on the tentative subdivision map and shall include narrative explaining the proposed phasing. Unless a phasing plan for improvements is approved by the Planning Director and the City Engineer, the project developer shall complete all of the on- site improvements at one time. The project developer shall submit improvement plans clearly depicting proposed phasing for review and approval by the City Page 28 of 37