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2450 Washington Avenue Apartments 17 October 2011 POTENTIALLY POTENTIALLY SIGNIFICANT LESS THAN ISSUES SIGNIFICANT UNLESS SIGNIFICANT IMPAOCT SOURCES ISSUES MITIGATION IMPACT INCORPORATED The project area is classified by the California Geological Survey as MRZ -1, a Mineral Resource Zone for which there is adequate information to indicate there are no aggregate mineral resources present. Consequently, there would be no impact on mineral resources with project implementation and no mitigation measures are required. - - - - a. Exposure of persons to or generation of noise levels in X 4,10 excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies? b. Exposure of persons to or generation of excessive X 4,10 roundborne vibration or groundborne noise levels? C. A substantial permanent increase in ambient noise X 4,10 levels in the project vicinity above levels existing without the project? d. A substantial temporary or periodic increase in X 4,10 ambient noise levels in the project vicinity above levels existing without the project? e. For a project located within an airport land use plan or X 4,10 where such a plan has not been adopted within 2 miles of a public airport or public use airport, would the project expose people residing or working in the p roject area to excessive noise levels? f. For a project within the vicinity of a private airstrip, X 4 would the project expose people residing or working in the project area to excessive noise levels? EXPLANATION: a -d) Development of the project site with a 66 -unit residential subdivision will bring new sensitive receptors into the project area. Existing ambient noise in the vicinity of the project site is predominantly due to vehicular traffic along San Leandro Boulevard and Washington Avenue. Noise is also generated by the BART train which transects the city and is located 411 feet west of the project site. An acoustical study was prepared for the project that quantified the noise environment at the project site and provided recommended mitigation measures to ensure that the proposed project is in compliance with City and State standards (Charles M. Salter Associates, Inc., September 24, 2008). To quantify the existing noise environment, three continuous long -term 144 -hour (L1 through L2) and four short -term, 15- minute (S1 through S6) noise monitor measurements between July I and July 3, 2008 were taken. In accordance with the City of San Leandro Noise Element, the proposed project must strive to maintain an exterior noise level of no more than 60 dB Ldn (day -night average sound level) in residential areas. After project build -out, exterior noise levels were projected to be approximately 67 dB at the pool area. As stated in the City's Noise Element, the city acknowledges that some areas of San Leandro are exposed to exterior noise levels above an Ldn of 60 dB and states that noise abatement features should be included to benefit these areas. The pool area is surrounded by a six -foot high sound -rated fence which serves to reduce exterior noise levels at the pool area. To meet interior noise levels and the associated Building Code DNL 45 dB requirement, it will be necessary for some of the facades to be sound rated. As a result, the minimum STC3 ratings will be needed at some of the project's exterior windows and doors. 2450 Washington Avenue Apartments 17 October 2011