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Pam Hardy Apri19, 2008 Page 6 the year for 7 to 10 day stretches. The shooting occurs during daytime and evening hours (between 8:00 AM and 10:00 PM). Data from the 1996 study shows the maximum noise levels due to use of the range would be about 62 dBA Lm~ at ground level on the site behind the existing sound wall and up to 74 dBA L,,,a,; at second-story elevations overlooking the sound wall. The day/night average noise level resulting from the firing range was estimated to be about 30 DNL in outdoor activity azeas and 40 DNL at the second-story overlooking the OSC. The normal operating hours for the OSC are 7:00 AM to 3:30 PM, Monday through Friday. The site is used intermittently during the weekends and at other hours of the day and night. Nighttime use is limited to response to emergencies when trucks must leave and return to the center. There is also an engine generator located at the OSC which is tested weekly. Afire training center is located on the eastern side of the site. During the I&R noise survey, the fire deparhnent was running drills at the fire training center. The average noise level measured near the project site (on the OSC property) was 59 dBA Ley. The average noise level dropped to 48 dBA L~ during the morning measurement period when activities at the fire training center stopped. The movement of materials around the OSC requires occasional use of bulldozers and backhoes. This equipment typically generates noise levels of approximately 85 dBA at a distance of 50 feet. These pieces of equipment do not normally operate at the OSC but may infrequently generate intermittent noise levels during the daytime. No major roadways adjoin the site. The nearest freeway is over a mile away. The project site would not be exposed to significant traffic noise levels. The site is located about 1.8 miles from Livermore Airport. A review of the Airport noise contour map in the City General Plan shows that the site is located about 0.8 mile outside the 60 La„ contour. The aircraft noise exposure at the site is estimated to be less than 55 dBA Ld,,. Aircraft noise was not noted in the 1996 noise study and was not noted during the I&R site visit in March 2008. The only other sources of noise affecting the project site aze noise from current construction activities to the west and distant industrial facilities to the south. Backup beepers aze occasionally audible from these various sources and was noted in 1996 and 2008. No other sources of noise make a significant contribution to the noise environment at the project site. Analysis Residential development in Pleasanton is considered compatible with the noise environment if the noise exposure is 60 dBA DNL or less. Traffic noise at the project site is currently expected to be less than 60 dBA DNL along Mohr Avenue. This is the only roadway that adjoins the project site. The distance and shielding is sufficient to attenuate all of the roadway traffic to a less-than-significant level. The noise exposure at the project site is less than 60 dBA DNL; so on an average basis, the noise environment is compatible for the proposed residential development.