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Indoor Air Quality - In accordance with the recommendations of BAAQMD, appropriate measures shall be incorporated into building design in order to reduce the potential health risk due to exposure of sensitive receptors to TACs to a less than significant level. Project applicants shall retain a qualified air quality consultant to prepare a health risk assessment (HRA) in accordance with the BAAQMD requirements to determine the exposure of project residents/occupants/users to air pollutants prior to PUD approval. The HRA shall be submitted to the Community Development Department for review and approval. The applicant shall implement the approved HRA mitigation measure recommendations, if any, in order to reduce exposure to TACs below BAAQMDs threshold of significance at the time of project approval. Outdoor Air Quality- To the maximum extent practicable, individual and common exterior open space, including playgrounds, patios, and decks, shall either be shielded from the source of air pollution by buildings or otherwise buffered to further reduce air pollution for project occupants. Site(s) affected: All (Draft SEIR, pp. 4.B-21 to 4.8-24; Final SEIR, pp. 2-4 to 2-5.) Impact 4.B-5 Development facilitated by the proposed General Plan Amendment and rezonings could potentially include residential developments that expose occupants to sources of substantial odors affecting a substantial number of people. The SEIR evaluates the impact of the proposed project related to the exposure of residents to substantial odors. Existing odor sources in the City of Pleasanton include: (1) sand- and-gravel harvesting areas — including asphalt plants — along Stanley Boulevard; (2) the Dublin-San Ramon Services District sewage treatment plant on Johnson Drive and the treatment ponds and drying beds north of Stoneridge Drive; and (3) the solid waste transfer station on Busch Road. Significance Before Mitigation: Significant Significance After Mitigation: Less than Significant Finding. Changes or alterations have been required in or incorporated into the Project that would avoid or substantially lessen the significant environmental effect as identified in the SEIR. Mitigation Measure 4.B-5, which has been required in or incorporated into the Project, will reduce the significant environmental impact to a less than significant level. Facts in Support of Finding The following facts and mitigation measure indicate that the impact will be reduced to less than significant.