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the entrance to the Oak Grove development: a route entirely on Hearst Drive, and a route that connects Hearst Drive to Bernal Avenue via Concord Street and Palomino Drive. For the purposes of the residential street analysis, the project trips that would use either the first route or the second route were analyzed conservatively by assigning project traffic to both routes in order to reflect the most conservative analysis for each street segment. The traffic analysis in Appendix F of the DEIR concluded that these three residential collector streets would operate acceptably -LOS "D" or better -under the scenarios analyzed. Project traffic is projected to have minimal effects on other neighboring residential streets, and no adverse impact is found relating to this issue. Regarding project traffic relating to the Vintage Hills Elementary School site on Concord Street, the DEIR's residential street analysis did not find that traffic levels would be significantly affected by the school-related trips associated with the project. Habitat/VVetland Areas Approximately 77 acres of the 562-acre project site -the footprint of the preliminary project grading plan -would be altered by the proposed preferred alternative development, and would include the areas for lots, streets and infrastructure, and the two stockpile areas that would receive the soil displaced from the construction of the subdivision. Depositing the material in the stockpile areas will require three crossings of ephemeral streams. The DEIR evaluated the entire site for its biological diversity and identified the possible impacts of development and the mitigation measures required to reduce these impacts to aless-than-significant level. The DEIR analyzed several concerns related to: ^ Impact of grading on biological resources; ^ Impact of development pattern on biological resources; specifically, landscaping irrigation effects on lower elevation trees; ^ Impact on Special Status Species; ^ Impact on wildlife species and habitats; specifically, displacement, loss of habitat (both general and species specific), and domesticated animals effects; ^ Tree removal; specifically, habitat loss and erosion control; and, ^ Cumulative impacts; specifically, wildlife habitat, heritage trees, oak woodland loss, and loss of open space. Vegetation Vegetation is comprised primarily of non-native grassland and blue oak woodland, with interspersed small areas of Diablan sage scrub. The site contains over 12,000 trees. Of the trees surveyed in the EIR, approximately 950 trees greater than six inches in diameter are located within and immediately adjacent to the proposed graded areas. Several trees will be located on the individual lots in the areas designated on these lots PUD-33 Page 27 of 59 June 13, 2007