UBLIC HEARING: Director of Development ... - City of Glendale

39
4. 4. Noise
hours of 7:00 A.M. and 7:00 P.M., 18 percent occurred between 7:00 P.M. and 10:00 P.M., and
15 percent occurred between 10:00 P.M. and 7:00 A.M. The average number of flight events
per weekday that occurred over the entire 18 year period ranged from a low of 49 in the years
1989 through 1992 to a high of 159 in the years 1978 through 1983. 37 Although some flight
events occurred on weekends, the majority of events occurred on weekdays. The helicopter
noise study prepared for this document was based on weekday trips. Table 7 indicates that
these flight'events only increased the ambient noise levels at the receptor locations by a
maximum CNEL of 0.47 dB.
The existing ambient noise level at all four receptor locations is a CNEL of 66.96. This
exceeds the significance threshold for a CNEL of 60 dB for residential areas, as established by
the City of Glendale. 38 It is estimated that the proposed project will generate approximately
ten flight events per day.39 Almost all of these flight events will occur between the hours
of 9:00 A.M. and 4:00 P.M. Approximately one to two flights per month will occur between
7:00 P.M. and 10:00 P.M. There would be no flights between 10:00 P.M. and 7:00 A.M. The
estimated CNEL that would be generated by each of these flight events at the four receptors
would range from 24 to 35 dB, as indicated on Table 8. However, the existing background
. noise, in combination with the sound generated by these individual flight events, would not
increase the ambient noise levels at the four receptor locations, as indicated in Table 8 on page
46, due to the predominance of freeway and railroad noise. Since the ambient noise levels at
the receptor locations would not be increased by project helicopter flights, and since the most
of these flights would occur between the hours of 9:00 A.M. and 4:00 P.M., with none occurring
between 10 P.M. and 7:00 A.M., project generated helicopter operations would have a less than
significant impact on noise sensitive land uses in the project vicinity.
As there are no sensitive receptors in the vicinity of the proposed project, project
generated traffic wop.ld not have a significant impact on ambient noise levels, unlike the
Redevelopment Plan as a whole which would result in mobile noise impacts in the industrial
areas adjacent to certain residential areas. Similar to the Redevelopment Plan, stationary noise
sources on-site are anticipated to have less than significant impacts.
37 ArupAcoustics, DreamWorks SKGAnimation Campus Glendale Helipon Noise Assessments, May 15,1996,
page 5, Table 2.
38 City of Glendale, General Plan, Noise Elemenr, Figure 5, page 36.
[bid, page 5, Table 5.
Planning Consultants Research
Glendale Redevelopment Agency
Page 45
DreamWorks Animation Campus Addendum EIR
June 1996