UBLIC HEARING: Director of Development ... - City of Glendale
UBLIC HEARING: Director of Development ... - City of Glendale
UBLIC HEARING: Director of Development ... - City of Glendale
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Arup Acoustics<br />
Consultants in Acoustics • Noise • Vibration<br />
May 15, 1996<br />
Ms. Ricarda Bennen<br />
Heliport Consultants<br />
148 Gazania Court<br />
Thousand Oaks, CA 91362<br />
DreamWorks SKG Animation Campus <strong>Glendale</strong><br />
Heliport Noise Assessments<br />
Dear Ms. Bennett:<br />
2440 South Sepulveda BoulEMlfd<br />
Suite 180<br />
los Angeles<br />
California 90064<br />
(310) 312·5040<br />
Facsimile (310) 312-5788<br />
This report presents the results <strong>of</strong> our noise study <strong>of</strong> the proposed DreamWorks Heliport, which is<br />
to be located on the Department <strong>of</strong> Water and Power site (Crystal Springs Site) at the intersection<br />
<strong>of</strong> Ventura and Golden State Freeways, within the city <strong>of</strong> <strong>Glendale</strong>. The purpose <strong>of</strong> this stUdy was<br />
to evaluate:<br />
a. Potential noise impacts <strong>of</strong> the DreamWorks proposed heliport operation on the surrounding<br />
neighborhood communities, and<br />
b. The historical flight noise levels associated with the previous use <strong>of</strong> the heliport.<br />
ON SITE NOISE MEASUREMENTS<br />
Background noise measurements were conducted at the Crystal Springs Site (on site) and four<br />
surrounding neighborhood locations as shown in Figure 1. The neighborhood sites are found to<br />
the North, East and West <strong>of</strong> the Crystal Springs Site and were selected to represent the<br />
residential properties near the heliport. At these locations, exterior sound readings were<br />
undertaken for periods <strong>of</strong> 10 minutes during the early afternoon <strong>of</strong> Thursday and Friday, February<br />
29 and March 1, 1996. The on site measurements were conducted continuously for a 24-hour<br />
period, starting at 3:00 p.m. Thursday, February 29 through March 1,1996.<br />
DATA ACQUISITiON SYSTEM<br />
The ambient noise survey was carried out using a Larson-Davis model 870 portable noise monitor<br />
and associated microphone. The data acquisition system used to measure the background noise<br />
levels meet and exceed the requirements for the Type I standard instruments as defined in the<br />
American National Standard Institute (ANSI) specifications S14, IEC651, and IEC804. The<br />
microphone was calibrated prior to and after completion <strong>of</strong> the survey to ensure the accuracy <strong>of</strong><br />
measurements.<br />
NOISE DESCRIPTORS<br />
In evaluating and describing ambient noise, se.veral metrics are used to describe the noise<br />
measurements. In this report the results <strong>of</strong> measurements and calculations are presented in terms<br />
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