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HomeMy WebLinkAboutOB 1 AIRPORT REPORT 11-02-92OLD BUSINESS NO. 1 11-2-92 WOW i Inter -Com DATE: NOVEMBER 21 1992 -�-�-' TO: WILLIAM A. HUSTON, CITY MANAGER FROM: COMMUNITY DEVELOPMENT DEPARTMENT S U BJ ECT: AIRPORT STATUS REPORT RECOMMENDATION Receive and file. DISCUSSION The Community Development Department has continued to monitor airport issues and attend all relevant meetings. Since the last Airport Status Report to the City Council on July 20, 1992, staff has reviewed the latest John Wayne Airport Noise Abatement Quarterly Report by the City's noise consultants. The Orange County Cities Airport Authority (OCCAA) - The OCCAA has canceled its monthly meetings until further notice due to lack of quorum and/or agenda. Airport Noise Report - J.J. Van Houten and Associates, Inc., Tustin's noise consultants, prepared a review of the most recent County -prepared John Wayne Airport Noise Abatement Program quarterly report for the 2nd quarter of 1992. A Copy of their report is attached. For the second quarter of 1992 there has been a two decibel decrease in aircraft -generated Community Noise Equivalent Level (CNEL) at monitoring station M7 in Tustin. During the same period, the average number of commercial jet operations has continued to decrease slightly. However, the number of quarterly noise complaints f.or Tustin/Orange has significantly increased, strongly implying that people react to Single Event Noise Equivalency Levels (SENEL) rather than long-term noise exposure (CNEL). Based on data through the second quarter of 1992, the annual average CNEL at station M7 will be 56.5 dB in 1992. This is about 1.0 dB less than the average annual CNEL of 57.5 dB for 1991. It is estimated that in 1992, the aircraft -generated CNEL will range from 54 to 60 dB. This is below the City, County, and State criteria of 65 dB for residential areas. City Council Report Airport Status Report November 2, 1992 Page 2 The consultant has again analyzed the relationship between changes in CNEL and the number of quieter aircraft put into service at John Wayne Airport. This analysis shows that the percentage of quiet Class E aircraft has increased and noise levels have decreased slightly. As indicated in the last Airport Status Report, the distribution of Class A, AA, and E aircraft (which are all quiet, Stage III aircraft) at John Wayne Airport fluctuates with carrier mix, flights offered, and airline choice. Therefore, the number of Class E aircraft, which, is the quietest type, actually fluctuates over time. However, these three classifications, which are unique to John Wayne Airport,'apply only to departure noise levels. In fact, some aircraft classified as "E" are actually noisier on arrival than some Class A and AA aircraft. Therefore the percentage of Class E aircraft does not significantly affect noise levels at Tustin's noise monitoring station. As a result, it is difficult to correlate the types of aircraft flown with the measured CNEL. CONCLUSION Because the issues discussed above are of considerable importance to the City of Tustin, the Community Development Department will continue to monitor airport issues unless otherwise directed by Council. Scott Reekstin 4Ri Westf i �el d Assistant Planner Assistant Director of Community Development Attachments: Report from J.J. Van Houten and Associates CS:SR:kd\airpsta3.sr J. J. VAN HOUTEN & ASSOCIATES, Inc. JOHN J. VAN HOUTEN, PE, Principal Consultant DAVID L. WIELAND, Principal Engineer ROBERT WOO, Senior Engineer STUART TAY, Associate Engineer October 14, 1992 CITY OF TUSTIN Community Development Department 15222 Del Amo Avenue Tustin, CA 92680 Attention: Ms. Rita Westfield 1260 EAST KATELLA AVENUE, ANAHEIM, CALIFORNIA 92805 {714) 978-7018 (714) 635-9520 FAX (714) 93940648 Project File 2306-91 COMMUNITY Subject: Review of John Wayne Airport Noise Abatement Program Quarterly Report, 2nd Quarter 1992 Reference: 1. "Data Evaluation and Aircraft Noise Impact Study for the City of Tustin.," J. J. Van Houten and Associates, Inc., January 8, 1990 2. "Noise Abatement Program Quarterly Report for the Period: April 1, 1992 through June 30, 19929" John Wayne Airport Dear Ms. Westfield: As requested, we have reviewed the referenced quarterly report for the noise abatement program at John Wayne Airport. The following provides our findings with regard to airport operations and their impact on the City of Tustin: 1. Referring to Figures 1 and 2, the aircraft -generated CNEL for the second quarter of 1992 was almost 2 dB less than during the first quarter CNEL at remote monitoring station M7. Based upon data through the 2nd quarter, the average annual CNEL at station M7 will be 56.5 dB for 1992. This is about 1 dB less than the average annual CNEL of 57.5 dB for 1991. (NOTE: The noise contours for John Wayne Airport are based on average annual CNEL values measured at each remote monitoring station.) 2. Referring to Figure 2, there does not appear to be any correlation between the average number of noise complaints received from the Tustin/Orange area and the average quarterly aircraft CNEL or the average quarterly number of jet operations. As indicated in the figure, the number of noise complaints was significantly higher in the second quarter of 1992 than in 1991, even though the average number of flights has decreased slightly. Referring again to Figure 2, the 1 increase in complaints also does not correlate with the drop in CNEL during the second quarter of 1992. 3. As indicated in Item 1, above, the annual average CNEL measured at station M7 will be about 56.5 dB based on information through the second quarter of 1992. This is less than the 58 dB that was estimated for the station in the referenced aircraft noise impact study for the Phase 2 Access Plan (Reference 1). AIRCRAFT NOISE CONTOURS In 1988, an exterior aircraft noise monitoring effort was conducted throughout the City of Tustin by the John Wayne Airport Noise Abatement Office and by J. J. Van Houten and Associates, Inc. (Reference 1). Aircraft -generated single event noise exposure levels (SENEL's) were measured at twelve locations in Tustin over a five month period. As a result of this effort, noise contours were developed for John Wayne Airport as they impact the City of Tustin. Although the shape of the contours does not change (since flight tracks are fixed), the value of the noise contours does change with different levels of operations at the airport and different mixes of aircraft. Figure 3 provides the approximate location of the John Wayne Airport noise contours for 1990 based on measurements obtained at monitoring station M7 throughout the year. Referring to the figure, the community noise equivalent level (CNEL) ranged from 53 to 59 dB in the City of Tustin, with a CNEL of about 55 dB at station M7. Based on data through the second quarter, the annual average CNEL at station M7 will be 56.5 dB in 1992. The existing and future Phase 2 contours (based on 1992 data) are obtained by subtracting 1 dB from the values provided in Figure 4. Referring to the figure, it is estimated that in 1992 the aircraft -generated CNEL will range from 54 to 60. dB. This is well below the City, County, and State criteria of 65 dB for residential areas. USE OF QUIETER AIRCRAFT AT JWA Analysis has been performed to investigate the correlation between the increasing use of quieter aircraft at JWA and the change in CNEL within the City of Tustin. The Federal Aviation Administration (FAA) classifies aircraft into three categories based on noise levels. In order ofF decreasing noise levels, there are Stage I, Stage II, and Stage III aircraft. John Wayne Airport has only permitted Stage III aircraft since the early 1970's. The airport has its own classification scheme for passenger aircraft. In order of decreasing noise level, these are Class A, Class AA, and Class E aircraft. Table 1 provides the %A J. J. VAN HOUTEN & ASSOCIATES, Inc. Crff OF TUSM Project File 2306-91 number of each class of aircraft that used the airport between the first quarter of 1991 and the second quarter of 1992. Also provided is the measured average quarterly CNEL at monitoring station M7. Table 2 provides the same information, but the values have been normalized to 7,500 aircraft per quarter. In this way, a correlation can be established between the quarterly CNEL and the mix of aircraft types. Referring to Table 2 and Figure 5, the percentage of quieter Class E aircraft using John Wayne Airport increased slightly during the second quarter of 1992 to about 21% of the aircraft mix. Referring again to Table 2, the increase in Class E aircraft was offset by a decrease in the use of the noisier Class AA aircraft. The result, as indicated in Table 2, is a slightly lower quarterly CNEL. If you have any questions, please contact the undersigned at 714/978-7018. Very truly yours, J. J. VAN HOUTEN & ASSOCIATES, INC. je�f ohn. Vaigiut n, P.E. ltingr in Acoustics dw \wpsl\reports\2300-a9\23062y92 3 J. J. VAN HOUTEN & ASSOCIATES, Inc. 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