SU0004916 - Laserfiche WebLink

Home Browse Search

► Community Park:The southern 1,800 feet of the community park would be subject to freeway noise of up to 60 dBA CNEL. Limited Industrial:The southernmost 190 feet of the limited industrial area would be subject to freeway noise of up to 75 dBA CNEL. Along I-205,the proposed landscaped buffer would consist of a berm and trees, and other plantings within a 100-foot minimum setback from the freeway right-of-way. This would be followed by proposed limited industrial buildings of up to three stories and related parking, followed by Central Parkway,then the proposed residential uses. On the college property,the southerly 300 feet after the 100-foot landscaped buffer would be parking areas, followed by an open common area and college buildings.The proposed landscaped buffer would help attenuate some of the freeway noise at the above uses,whereas the proposed limited industrial uses would help attenuate some of the freeway noise at the proposed residential and park uses.The precise attenuation that would be _ provided by these intervening uses is unknown because specific design plans were not available at the time of this Draft EIR for the landscaped buffer and limited industrial uses.What is known is that the unattenuated noise from the freeway would encroach into the proposed uses at levels above the applicable noise thresholds.A significant — impact could occur. Aircraft Noise _ Byron Airport is located approximately 5 miles northwest of the College Park project site in Contra Costa County. Overflights of aircraft from the airport add to ambient noise conditions at the College Park project site(San Joaquin County 1994). The Contra Costa County Airports Division is currently preparing a Byron Airport Master Plan Update and Business Plan. The Airports Division expects the number of aircraft operations(take-offs and landings)at Byron Airport to increase approximately 0.5%per year.There are approximately 40,000 annual aircraft operations,and approximately 63,000 are expected by the year 2023.This is not a considerably large increase in operations activity with respect to changes in the noise environment(Arens 2004).The College Park project site is located approximately 4 miles from the preliminary 55 CNEL aircraft noise contour estimated for the year 2023 (Leigh Fisher Associates,2004). Although the Byron Airport Master Plan Update and Business Plan aims to extend one of its runways from 4,500 feet to 6,000 feet,the ability for the airport to substantially increase at its current location is limited by the habitat management lands surrounding the airport.Therefore,at its current location,Byron Airport can be expected to remain a general aviation airport. Most of the airport's habitat management lands are on the Mountain House side of the airport and,therefore,would provide a buffer zone for future potential residents of the Mountain House area.Also,the types of aircraft using the airport are not expected to change.Furthermore,the Contra Costa County Airport Land Use Compatibility Plan(2000)identified the College Park project site as part of a _ compatibility zone(Zone D)on which residential and nonresidential development is unrestricted;however,the Contra Costa County Community Development Department Current Planning Division(CCCCDD)has recently generated a new Real Estate Disclosure Airport Influence Area Map.In this more current map,Contra Costa — County has decided not to determine if areas outside Contra Costa County, including Mountain House, should require real estate disclosures; instead Contra Costa County believes neighboring counties should make their own determinations(Cross 2004). On the new map,all the real estate disclosure areas shown are within 2 miles of the Airport(CCCCDD 2004). Thus,the most likely major noise source that could affect the College Park site is a straight-in landing approach that crosses over portions of proposed Neighborhoods A,B,and D(Arens 2004;MHMP 2000). Light plane operations would produce minimal noise impacts on the College Park site because most of these aircraft would pass over the College Park site at such altitudes that their presence largely unnoticeable.Therefore, the compatibility of the proposed land uses with existing aircraft noise is considered less than significant. Nonetheless,the MHMP includes a requirement that home buyers in the airport overflight zone areas shall be EDAW College Park at Mountain House Specific Plan III Draft EIR Noise 4.13-28 San Joaquin County