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before Central Parkway, and along the entrances to Tradition Street and Providence Street; a 10- foot soundwall along the west side of De Anza Boulevard from Mountain House Boulevard to Mascot Boulevard; an 8-foot soundwall along the north side of Mascot Boulevard from De Anza Boulevard to the fire station property, and along the entrances to Tradition Street and Prosperity Street; a 6-foot to 8-foot soundwall along the north side of the recreational facility-neighborhood commercial property; a 6-foot to 8-foot soundwall along the south side of Wicklund Crossing; and a 6-foot soundwall along the east and north sides of the fire station property. If the Planning Commission determines that an outdoor noise level standard of 65 dB Ldn should be used in certain instances in order to reduce soundwall height, the 10-foot soundwall along De Anza Boulevard would be reduced to 7 feet, and the 8-foot soundwalls to 6-7 feet. (Note: Use of the 65 dB Ldn standard is permitted by the Master Plan, Section 11.3.1 (e), if it is not possible to reduce noise in outdoor activity areas to 60dB Ldn or less using practical application of the best available noise reduction measures.) If this decision is implemented, Trimark would be required to notify affected residents that the outdoor sound level has not been reduced to the design goal of 60dB Ldn. As an alternative to constructing soundwalls greater than 6 feet in height, Trimark could increase the setback of homes farther from De Anza Boulevard and Mountain House Boulevard. Increasing the setback would allow a lower soundwall height to achieve the desired exterior noise environment, but would entail a redesign of the proposed project. 13. Air Quality To reduce impacts to air quality, the proposed project would be subject to the policies and requirements of the Master Plan, the Transportation Demand Management(TDM) Program, the Transit Plan, the Congestion Management Plan (CMP), and other applicable plans. The proposed project would not conflict with the applicable clean air plans of the San Joaquin Valley Unified Air Pollution Control District(SJVUAPCD). (Note: At the time of certification of the 1994 EIR, a Statement of Overriding Considerations was prepared for significant impacts to regional air quality that could not be mitigated to a less-than- significant level by mitigation measures. These same significant and unavoidable impacts would remain for the proposed project; however, they do not require additional findings or the preparation of an EIR because the 1994 EIR adequately addressed the issue. The proposed project would not increase impacts identified earlier.) Although the proposed project would be subject to the policies and requirements of all applicable plans to reduce impacts to air quality,future residents of the proposed project could be exposed to agriculturally-relatedemissions generated outside its boundaries. Dust and particulate matter associated with agricultural activities such as tilling,mowing and soil preparation would be carried onto the site where its deposition would soil exposed surfaces and potentially irritate residents with pre-existing lung problems. This would be especially true on the west side of the proposed project site where high winds that normally blow from the west amplify dust generation. To the extent possible,Trimark would endeavor to mitigate these impacts. Lands to the west of the proposed project site,just west of the proposed Central Parkway,would be set aside as a agricultural buffer and planted with a fallow crop such as alfalfa to minimize dust generation.The proposed agricultural buffer,varying would vary in width from 100 feet to as much as 1,600 feet, would be adequate to minimize dust for on-site residents of the proposed project(see Figure 8). Residents at the east side of the proposed project would be separated from agricultural operations by commercial/industrial uses and Mountain House Parkway. Tree plantings proposed along Mountain House Parkway would also help to reduce dust emissions from agricultural operations. -13-