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determined by the magnitude of the noise Mountain House Area. It is an eight-lane environment, as described by the day/night facility over the Altamont Pass between average noise level (Ldn). This noise Livermore and its junction with I-205. descriptor was developed by the federal South of its junction with 1-205, I-580 is a Enviromental Protection Agency to provide four lane freeway. Access to I-580 is a single number rating of community noise provided via either Grant Line Road or levels. The Ldn is calculated to account for Patterson Pass Road. Interstate 205 (1-205) the increased sensitivity of people to noises is an east-west freeway that connects I-580 that occur at night. to I-5 through the city of Tracy. It is a four- lane facility which is a major commute The Noise Elements of the two Counties route from the Central Valley into the 9- include noise exposure information perti- County Bay Area. The major access from nent to land use planning. Incorporation of the project to Route 205 is at the Patterson this information is particularly important in Pass Road interchange. planning the location and design of new housing, as residential land use is among the Byron Bethany Road (J4) is a county road most noise sensitive. Schools and hospitals that runs from State Route 4, in Brentwood are uses especially sensitive to high noise to downtown Tracy. It nuns northwest and levels. The circulation system is one of the southeast through the study area. Access major sources of noise. Noise exposure will from the project is provided at intersections thus be a factor in the location and design of with Mountain House Road and Patterson new transportation routes and facilities. Pass Road. Grant Line Road is a major east-west route that serves downtown Tracy. D. Transportation It provides a link from I-5 westerly through Tracy to the Mountain House Planning Existing Roadways and Freeways: Area. Patterson Pass Road is a two-lane, rural road that runs from I-580 north to The Mountain House Area is served by a Byron Bethany Road. It is a north-south combination of major freeways, County route that has interchanges with 1-580 and I- through routes, and rural roads. The road- 205. Patterson Pass Road serves as the ways discussed in this section fall within the eastern boundary of the study area. Moun- multiple jurisdictions of Caltrans, Alameda tain House Road is a two-lane, rural road County, San Joaquin County, and Contra that forms the western boundary of the Costa County. study area. It is a north-south route that provides a connection between Grant Line Regional access to the study area is pro- Road and Byron Bethany Road (J4). Alta- vided by the Interstate 580 (1-580) freeway, mont Pass Road is an east-west route that the principal east-west route. The I-580 parallels I-580,on the north side of the freeway runs west and southeast form the freeway,between the Greenville Road Site Description 3.6