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during the daytime hours (7AM - 10PM) and two (2) during the nighttime hours <br />(10PM- 7AM)). Short-term noise monitoring location 1 (ST-1) is located on the <br />project site's property approximately 10 feet from the eastern property line and 110 <br />feet from the centerline of MacArthur Boulevard. ST-1 describes the noise <br />environment associated existing project site. ST-2 is located 10 feet from the <br />residential units directly east of the project site. ST-2 describes the noise <br />environment associated with the residential units at the ground floor level. Both <br />ST-1 and ST-2 indicate the typical ambient noise levels during the daytime and <br />nighttime hours. Traffic noise is the predominant noise source impacting the <br />adjacent residential units. The noise measurements conclude that the residential <br />units (located approxima#ely 30 feet from the project site's eastern property line) <br />existing noise environment is exceeded by the surrounding ambient noise levels. <br />The City's noise ordinance is violated by pass-by vehicular traffic and the <br />surrounding environment. The City noise code states that in the event the ambient <br />noise levels exceed the noise ordinance, the maximum allowable noise level shall be <br />increased to reflect the maximum ambient noise level. <br />By including the referenced and measured noise levels associated with the ambient <br />noise conditions near and around the project site, future noise levels were <br />calculated. The projected noise levels propagating from the Sonic Drive-In to the <br />residential units were calculated by adding logarithmically the projected Sonic <br />Drive-In noise levels to the corresponding noise levels during the different daytime <br />and nighttime hours. These future noise levels were compared to City of Santa <br />Ana's noise ordinance, <br />Tables 3 through 6 indicate the anticipated exterior/interior! day and night noise <br />levels associated with the proposed project. The calculated first and second floor <br />exterior noise levels during the day and night hours are expected to range from 53.5 <br />to 61.6 dBA Leq. The calculated first and second floor interior noise levels during <br />the day and night hours are expected to have a maximum noise level range of 47.0 <br />to 55.6 dBA Lmax. The tables also indicate the expected change in noise level as a <br />1-z <br />31 B-14 <br />