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Home My WebLink About03 AIRPORT STATUS RPT 05-15-95NO. 3 5-15-95 ATE: ~¥ 15, 1995 Inter-Com TO: WILLIAM A. HUSTON, CITY MANAGER FROM: COMMUNITY DEVELOPMENT DEPARTMENT SUBJECT: AIRPORT STATUS REPORT RECOMMENDATION Receive and file. FISCAL IMPACT The City retains the acoustics consulting firm of J. J. Van Houten and Associates, Inc. for review of noise-related items; there is a limitation of one-thousand dollars ($1,000) per review of each John Wayne Airport (JWA) Noise Abatement Quarterly Report. DISCUSSION The acoustics consultant reviews the County-prepared John Wayne Airport Noise Abatement Program quarterly reports. A copy of their analysis for the second quarter of 1994 is attached. According to A1 Brady, a noise specialist with the Noise Abatement Office of JWA, the complexity of compiling data, a lengthy review period, and a heavy county work load resulted in a nearly one-year delay in the availability of the quarterly report. Generally, the quarterly report discusses the Community Noise Equivalent Level (CNEL) at Remote Monitoring Station (RMS) #7, located in Tustin. However, that station was temporarily removed from service in December 1993 due to building, construction on the site. The monitor was not returned to service until late October of 1994. Consequently, there is no daily CNEL data for the first and second quarters of 1994. Based on data for all quarters of 1993, the annual average CNEL at station M7 was 56.7 dB. This is four-tenths (.4) of a decibel higher than the average annual CNEL of 56.3 dB for 1992. However, this is still below the City, County, and State criteria of 65 dB for residential areas. City Council Report Airport Status Report May 15, 1995 Page 2 During this quarter, approximately 30 Tustin noise complaints were received by John Wayne Airport. The number of complaints for quarters in 1993 ranged from a low of approximately 19 to a high of 75. Since the early 1970's only Stage III aircraft, the quietest Federal Aviation Administration (FAA) classification of airplanes, have been permitted at JWA. The airport has its own more detailed Classification system for passenger aircraft (Classes A, AA, and E). The use of the quietest class, Class E, was higher in the second quarter of 1994 (26.4%) than throughout all of 1993. There was also a decrease in the Class A aircraft, the noisiest used. The classifications relate to noise generated during take-offs, not landings. In some cases, Class E aircraft 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 in our City. Further, with Tustin's noise monitor temporarily disabled, it is not known what impaCt the change in aircraft mix had on the 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 the City Council. PaVia Ra~ih \ As~ociat9 Planner Assistant Director of Community Development RI4: PR: kd\CCREPORT\ai rpstat, may Attachments: Report from J.J. Van Houten and Associates, Inc. John J. Van Houten, P.E. Consulti.g Engineer in Acoustics David L. Wieland Principal Consultant J. J. VAN HOUTEN & ASSOCIATES, INC. March 30, 1995 CI~ OF ~S~N Co~uffi~ Development Depmment 300 Cente~ Way Tusti~ CA 92680 Project File 2306-91 Attention: Ms. Rita Westfield Subject: Review of John Wayne Airport Noise Abatement Program Quarterly Report, 2nd Quarter 1994 Reference: 1. "Data Evaluation and Aircraft Noise Impact Study for the City of Tustin," J. J. Van Houten and Associates, Inc., January 8, 1990 . "Noise Abatement Program Quarterly Report for the Period: April 1, 1994 through June 30, 1994," John Wayne Airport Dear Ms. Westfield: As requested, we have reviewed the referenced quarterly report for the noise abatement program at John Wayne Airport. Please note that remote monitoring station #7 in Tustin was temporarily re- moved from service on December 22, 1993 due to building construc- tion at the location. The monitor was scheduled to return to service in late October, 1994. AS a result, there is no daily CNEL data for the first and second quarters of 1994. However, the referenced report does provide data on the number of flights during the second qua~er of 1994, the classification of those aircraft, and the number of complaints received by the airport staff. We have updated the attached tables and figures accordingly. Richter Avenue Suite 108 bwne, CA 92714 714/476-0932 FAX 714/476-1023 CITY OF TuffrIN Project File 2306-91 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 airFort 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. No data is yet available for 1994. However, based on data through all four quarters, the annual average CNEL at station M7 was 56.7 dB in 1993. The existing and future Phase 2 contours (based on 1993 data) are provided in Figure 4. Referring to the figure, it is estimated that in 1993 the aircraft-generated CNEL ranged from 55 to 61 dB. This is well below the City, County, and State criteria of 65 dB for residential areas. USE OF QUIETER AIRCRAFT AT JWA AS requested, we have analyzed 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 of 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 estimated number of each class of aircraft that used the airport between the first quarter of 1992 and the fourth quarter of 1993. 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 17,000 aircraft operations (takeoffs and landings) per quarter. In this way, a correlation can be established between the quarterly CNEL and the mix of aircraft types. J. J. VAN HOUTEN & ASSOCIATES, INC. CITY OF TuffrIN Project File 2306-91 Referring to Table 2 and Figure 5, the percentage of quieter Class E aircraft using John Wayne Airport was higher in the 2nd quarter of 1994 than throughout 1993 (abo_ut 26%). There was a decrease in Class A aircraft that was offset by an increase in the use of the quieter Class E aircraft. However, with the noise monitor temporarily disabled, it is not known what impact, if any, this change in aircraft mix had on the CNEL at RMS 7. If you have any questions, please contact the undersigned at 714/476-0932. Very truly yours, J. J. VAN H(>I::I-TFMq & ASSOCIATES, INC. P.E. Consulting Engineer in Acoustics Principal Consultant l i:\wpSl\reports\230049\23062q94 .o J. J. VAN HOUTEN & ASSOCIATES, INC. 0 Z Z "r 0 Z LLI (.3 Z ~~zz -. ~~z~ 0000 0 ~oooo aa ~ c~~ c~~~ Z 13:: 0 Z (BP) 13NO 60 I A erag?Qua?terly AircraffC____N_EL; MZI 40 20 20 1Qt~3 2Qtr93 I I 3Qt~3 4Qtr93 1Qtr94 2Qtr94 Quarter/Year I Total Quarterly Jet Operations, M7 1 0 '- 15 0 ~ ~ 10 -c 0 $ 0 ~ 80 0 60 0 z _>, 40 0 20 o 1Orr03 201/03 I 3Qtr93 4Qtr93 1Qtr94 2Qtr94 Quarte_,r~t ear I Average Quarterly Noise Complaints 1Qtr93 2Qtr93 3Qtr93 4Qtr93 1Qtr94 2Qtr94 Quarter/Year 3Qtr94 4Qtr94 Figure 2 M-7 i !1 · Il I! I! /! // // // 5 "5 5 .5 53 Figure 3. Approximate Location of John Wayne Airport NoiSe Contours, 1990 'M-7 // II · ° . II I! · '"'. !1 / II // // // '.6 .59.~. 58 5'? ~'Z--~_ - :so · 55 Figure 4. Approximate Location of John Wayne Airport Noise Contours, 1992 I I I ~pu~$noq£ SNOl.l.~l~dO ~OEI~ =lO Ei2E~IAIt~IN 0