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11/04/1985 - Airport Relations Commission CITY OF EAGAN AIRPORT NOISE COMMITTEE AGENDA THURSDAY NOVEMBER 7, 1985 I. ROLL CALL & APPROVAL OF MINUTES II. COMMITTEE UPDATE -180 Degree Heading Decision - Review of Correspondence -Other Airport Noise Groups - Committee of Committees - Governor's Task Force on Airport Noise III. OLD BUSINESS -Noise Monitoring Equipment IV. NEW BUSINESS - Public Awareness Campaign - Member Recommendation V. OTHER BUSINESS ADJOURNMENT MEMO TO: CHAIRMAN BAKER & ALL MEMBERS OF THE AIRPORT NOISE COMMITTEE FROM: ADMINISTRATIVE ASSISTANT HOHENSTEIN DATE: NOVEMBER 4, 1985 SUBJECT: AIRPORT NOISE COMMITTEE MEETING FOR NOVEMBER 7, 1985 A meeting of the Eagan Aiport Noise Committee is scheduled for Thursday, November 7, 1985, at 4:30 P.M. The meeting will be held in Conference Rooms A and B of the Municipal Center Building. Please contact Jon Hohenstein at 454 -8100 if you are unable to attend. The following discussion is intended to provide background on those items to be reviewed at the meeting on Thursday. MINUTES A copy of the regular minutes of the Eagan Airport Noise Committee meeting for October 10, 1985, is enclosed for your review. These minutes, subject to any change, require adoption by the Committee. COMMITTEE UPDATE 180 Degree Heading Decision On Friday, October 25, 1985, Mr. Les Case of the Federal Aviation Administration released the decision on the 180 degree heading procedure. The FAA denied implementation of the procedure on the basis that it would constrict further the use of the preferential runway system, thereby increasing the volume of traffic over south Minneapolis and aggravating the noise problem there. As the Committee will recall, the recommendation that the 180 degree heading procedure be overturned was part of the resolution approved by the Eagan City Council on November 26, 1984, and forwarded to the Metropolitan Airports Commission. In as much as this decision will reduce the impact from aircraft climbing directly off the end of the runway, it will not minimize the volume of traffic from aircraft using Runway 22 and turning toward their destination from other departure headings. The Committee should also bear in mind that the Airports Commission staff and the representatives of Richfield and Bloomington will express their displeasure with the decision and attempt to prove its validity and recommend its implementation next year. This is merely a staff observation, however, Mr. Les Case is retiring as of March, 1986, and his successor will likely be courted on this particular issue. No action is required of the Committee on this matter at this time. 1 CHAIRMAN BAKER & ALL MEMBERS OF THE AIRPORT NOISE COMMITTEE NOVEMBER 4, 1985 Review of Correspondence Pursuant to the Committee request, staff has reviewed a large amount of correspondence dating back to the beginning of 1985. Committee members were copied with most of the correspondence so staff chose not to reproduce those items at this time. The largest part of the correspondence was taken up by follow - ups to the November, 1984, City Council resolution to the Metropolitan Airports Commission and that relating to the legislation concerning run -up suppression. The correspondence relative to the 180 degree turn was helpful in securing the denial of the procedure by the Federal Aviation Administration as described above. Of the other items in the resolution, the recommendation that an air traffic noise task force be formed combining the activities of several cities has been pursued in a couple of ways. The cities of Mendota Heights and Burnsville routinely copy in the City of Eagan when corresponding on airport noise problems and City staff returns that favor. As you know, the Mayor is also involved in the formation of the Committee of Committees to be discussed below. As to the other items contained in the resolution, the matter of flight patterns over the City and observation of the 105 degree heading for departures on Runways 11 right and left have been handled informally by staff and directly by citizens contacting the Airports Commission. Staff will draft new correspondence in this regard pursuant to the Committee's recommendation from the meeting of October 10. The large amount of correspondence concerning run -up suppressors exchanged with various public officials ranging from the Metropolitan Airports Commission and Dave Kelso of the MPCA, to Attorney General Skip Humphrey and Representative Frenzel has tended to be less successful. The March deadline for submission of a suppressor plan was missed by the MAC under the assertion that a letter forwarded to the MPCA several years ago indicating a preference for the hush house design constituted their notice of the plan to the MPCA. MPCA and the Attorney General's staff did not agree with this estimation and demanded of the Airports Commission a full compliance with the law. The Airports Commission offered to direct its noise consultant, Howard - Needles, to prepare a progress report which is due to the MPCA at this time. Once again, Dave Kelso has indicated that failure to provide this report will result in legal action on the part of the MPCA for its compliance. The thrust of the MAC report is likely to be a documentation of the lack of need for a suppressor based on the monitoring equipment they have in place; this, despite the fact that the suppressor is in the airport's capital improvement budget. This matter came up at a senate hearing on Wednesday evening, October 30, 1985, which resulted in Senator Freeman, of the Richfield- CHAIRMAN BAKER & ALL MEMBERS OF THE AIRPORTS NOISE COMMITTEE NOVEMBER 4, 1985 Bloomington area, indicating that he feels the issue is resolved and that money should not be spent on a suppressor needlessly. This does not coincide with the indications from the Richfield MASAC representative who questioned the status of the suppressor at the October 22 MASAC meeting. As you can see, the Airport Noise Committee's recommendations have had mixed success. However, new correspondence is attached in your packets for Committee review which will address the areas recommended by the Committee for further action. Finally, you will find attached a copy of Representative Norman Mineta's response to our letter to Secretary of Transportation Dole. With your direction, staff could contact Representative Mineta for an update on the subcommittee results. Other Airport Noise Groups - Committee of Committees Mayor Blomquist has been active in the formation of the Committee of Committees through her contacts at Representative Frenzel's office. The Noise Committee will receive an update on the progress toward this body's formation, however, it has been overshadowed recently by the formation of the Governor's task force described below. - Governor's Task Force on Aiport Noise Mayor Blomquist is also serving as a member of the Governor's Task Force on Airport Noise. This body has met twice to formulate goals and hear presentations from various noise groups, industry representatives, and MAC staff. There is an indication that this committee will attempt to formulate recommendations for the Governor's review by January, 1986. The committee will receive an update on this body as well. OLD BUSINESS Noise Monitoring Equipment The matter of noise monitoring equipment was continued from the October 10 meeting of the Airport Noise Committee. Since that time, staff has received correspondence from Metrosonics Company of Rochester, New York, concerning their noise monitoring equipment. It turns out that the local representative of Metrosonics is Continental Safety Company of Eagan. Both firms have indicated that the type of equipment they are offering to us is the same as that used by the Airports Commission and by the MPCA. You will find attached a copy of the sales brochure on a db -604 universal sound level analyzer. One of these units can cost between $7,500 and $10,000. These units are available for lease at a monthly rate of 15% of the purchase price. CHAIRMAN BAKER & ALL MEMBERS OF THE AIRPORTS NOISE COMMITTEE NOVEMBER 4, 1985 A representative of Metrosonics has indicated that he will be in the Eagan area during the week of December 9 and would be interested in demonstrating the equipment to the Committee at that time. I believe that their local representative at Continental Safety could provide a demonstration also should the Committee choose to observe the equipment at some time other than December. ACTION TO BE CONSIDERED ON THIS ITEM: To direct staff to respond to Metrosonic's offer of equipment demonstration. NEW BUSINESS Public Awareness Campaign The committee has directed staff to prepare media items which will raise public awareness of the complaint phone numbers and the possibility of contacting elected officials at the local, state and federal level concerning airport noise issues. In this regard, staff has drafted a public service press release for the local newspapers and the City newsletter which would indicate that citizens are encouraged to use certain noise complaint numbers to express their concerns to responsible officials. Staff would recommend that this item be included in all City newsletters, on a quarterly basis in local newspapers, and on a monthly basis from May to August in the local newspapers. In addition, staff proposes to prepare a more extensive article for the spring City newsletter which would list not only phone numbers but mailing addresses for state representatives, state senators, federal officials, the Metropolitan Airports Commission and MASAC. As the spring newsletter comes out in May, this will allow local residents to have these numbers and addresses fresh in their minds during the most critical noise season. Other alternatives for public awareness include the use of Eagan's local access to the Burnsville /Eagan cable system and the possibility of preparing flyers for community distribution. The . idea of flyers may be redundant, however, as the newsletter is already distributed free of charge throughout the City and items in it can be clipped and saved for future reference. ACTION TO BE CONSIDERED ON THIS ITEM: To recommend that staff proceed with the release of the aircraft noise telephone numbers and prepare an item for the spring City newsletter. 4 CHAIRMAN BAKER & ALL MEMBERS OF THE AIRPORT NOISE COMMITTEE NOVEMBER 4, 1985 Member Recommendation As was discussed at the recent meetings of the Airport Noise . Committee, attendance of Committee meetings has been sporadic in certain cases. As January is the traditional time for the City Council to make appointments to the volunteer commissions and committees, the Committee may wish to discuss possible additions to the Committee membership. It would also be appropriate at this time to arrange for contacts with less active members to ascertain their desires to continue membership with the Committee. Staff would recommend that you discuss this matter but continue any action on it until the December meeting. This does not preclude the possibility of proposing names of new Committee members, if you have someone in mind. fil Adm lis$ ive Assistant JH /jj cc: Mayor Bea Blomquist City Administrator Tom Hedges City Planner Dale Runkle City Attorney Paul Hauge Attachments ,fig - \-- I _ V. ALL •. ,;,,7 ,'-7- ,,� .��. 1THhii S A WE r Irqk NEED.,, WIRE , , v r- � \ AIRRJW0I6E ? I ? ,, , 1 t hi --- . d ' YO: I 0 \ \ . is ‘ v 4. / , _ .-:-, - ,,: l"1 /// - , //A , ^ „ ) i" ' \\ ■ '''' . -A! .N ( i „,,,,,, •,.,..,,,,,,,,,_ liii`pr''. . 1 1 ; i , , \ 1 , c: li ,i ,,�, I i • /, ,,,, "4 ' ...rt.': 5 MINUTES OF THE EAGAN AIRPORT NOISE COMMITTEE EAGAN, MINNESOTA OCTOBER 10, 1985 A regular meeting of the Eagan Airport Noise Committee was held at the Eagan Municipal Center at 4:30 p.m. at which the following were present: Chairman Tom Baker, John Gustin, Joe Harrison, Carolyn Braun; Mayor Bea Blomquist, and City Councilman Tom Egan; and guest - Otto Leightner. Also present were City Administrative Intern John Hohenstein, City Administrator Tom Hedges and City Attorney Paul Hauge. MINUTES Gustin moved, Harrison seconded the motion to approve the minutes of the previous meeting of September 19, 1985. All voted yes. CAROLYN BRAUN City Council has approved the appointment of Carolyn Braun as a member of the Eagan Airport Noise Committee and it was noted that the ADHOC Committee has unspecified lengths of terms. MAC PART 150 STUDY A letter from the City Administrator to Walter Rockenstein, the Chairman of the MASAC dated September 20, 1985 responding to the request for recommendation for the Part 150 Study was reviewed. Three recommendations were made and it was understood that no specific action had been taken. STAGE III INCENTIVES - METRO TAX The recommendation of Jan DelCalzo for a metropolitan area tax to provide air carriers with incentives to purchase Stage III aircraft in the amount of $100,000,000.00 was discussed. The issue stirred significant metro -wide debate and no action is expected to be taken on the recommendation. There had been opposition to the proposal to add monetary supplements to airlines. Noise Committee Meeting October 10, 1985 NORTH EAGAN SUBDIVISIONS The concept providing targeted relief to the residential subdivisions in northern Eagan was proposed at the Airport Noise Committee meeting on June 27, 1985. In particular, the McKee Addition is an additional recipient of a substantial amount of airport noise and a suggestion was made by one resident that the City Council should encourage the conversion of residential properties in the area to residential use. One alternate would be to provide tax increment financing. It was noted that the City Council may not be favorable toward that approach and Joe Harrison suggested a broker be engaged by the property owners or by the City to consider the sale of all the residential parcels for industrial use on a private basis. After discussion, Harrison moved, Gustin seconded the motion to recommend to the City Council that the staff be directed to review alternates for the sale of residential parcels and conversion to higher density uses, such as industrial, and to submit the findings to the City Council and the Airport Noise Committee. It was noted that the proposal would allow a clear corridor for traffic from the parallel runways but there was concern that carriers would not comply with the 105 degree corridor pattern. It was suggested, however, that pressure be continues to be placed on all applicable agencies to follow the corridor and to explore the alternates, including tax increment financing, private brokerage acquisition and to further determine which owners would be interested in selling property for ultimate conversion to industrial use. All voted yes. REQUEST FOR LEGISLATIVE ACTION Gustin moved, Harrison seconaed the motion to direct the staff to review all correspondence relating to requests of the Committee for legislative and agency action and submit the information to the City Council for further action. All voted yea. JOINT METRO AREA NOISE COMMISSION The members of the Committee discussed the issue of a joint Metro Area Noise Committee and recommended that the City Council strongly encourage such an organization to be formulated along the lines proposed by Mayor Blomquist at the October 4, 1985 Noise Committee meeting. MAC INITIATIVES TO REDUCE OPERATIONS The Metropolitan Airports Commission went on record at its September meeting supporting the introduction of regulatory curbs on operations and the Committee discussed recent news articles concerning MAC initiatives to reinstitute a form of regulation to reduce the volume of airport traffic. Members expressed concern that a reduction of flights does not address the issue of keeping all flights within approved corridors. No official action was taken. 2 Noise Committee Meeting October 10, 1985 180 DEGREE HEADING STATUS Chairman Baker and Administrative Assistant Hohenstein reported on the status of the 180 degree heading procedure recommendation. Chairman Baker indicated that the recommendation had been forwarded by MAC to the FAA and that the FAA will begin review in the near future. Mr. Hohenstein reported that Burnsville Mayor Morrison's proposal for a 180 degree heading diverting traffic along the Minnesota River Valley was reported unfavorably from MASAC's operations committee and would not be proposed as part of the procedure. RUN -UP SUPPRESSOR Administrative Assistant Hohenstein reported that the MAC has authorized a report be prepared to indicate the lack of need for run -up suppressor. There was brief discussion concerning the issue, and the Committee members were concerned about bringing the issue to public notice. CONTINUATION Harrison moved, Gustin seconded the motion, all members voted yes, to continue the Agenda items on Noise Monitoring Equipment until the next regular meeting. All voted yes. ADJOURNMENT Upon motion duly made and seconded, the motion was adjourned at 6:05 p.m. All voted in favor. PHH Secretary 3 c1t reacnea sucn a than a nongraauale ana that Inc lnaier saki. uw: IL s a ,,,,,,c ueut lux referendum would be a wise in- "Our goal is to balance the this school district. I think it's board held a public vestment for the community. budget and live within our means necessary because I love my 22 to explain the "I consider myself a fiscal con- at the end of three years. Our job children very much and I want erendum and listen servative and yet we need this is just beginning," Bakewell said. them to have the same education ut. Per -pupil costs referendum and need it badly,_ "The reorganization (of the I had when I went through here." ed to an audience of Board Member Lee Bakewell , - +, ie 'hlers of Ehlers said. ., the district's "We certainly need more .1 985 Voters Guide ' sultant, money to maintain the programs ' i i d it costs $19.14 to we have. We need to maintain the S e e S 1 0-11 A ', I h pupil each day. nurses, music program, low- pgs. • Your Community Newspaper i S ` J � , • ,1 r r ''' Reinstatement o , _,+.: z � i 3. ,• - fir- - e- : t t ` = i. ilet 180 turn FAA ,. - ... z ; ,, .+. ... is vetoed by + f .r \ . --3-4..., ‘,...4,---..•.,77!-,...,.,,,fs!,, , d ; * a t ..-' .i,- ` $ , r e -~ , _M t By GARY KUBAT Case said it is the end of the It i 441f" . issue as far as the FAA is con- .,� Reinstating the 180 degree cerned, but that he has agreed to a n. • r,r.. ` ' • >. '� : . turn, which routed more airplane work with MAC on alternatives. i y �s , ,S;..G traffic over northern Burnsville Weslander said MAC hasn't con - '). . y >,� 's , f `-^- - . and % %stern Eagan. has heen tatted its legal counsel yet about ;/ ,t • _ - •:+s , '{'4 -, �'. vetoed by 14 ('a s e of the } ederal possible future action. i Aviation Administration ■ F'A.\ ■. The rise of the 18o- degree turn s t t i ' « - - Officials at the Metropolitan Air- began as an experiment in Dec- , -. . ports Commission were informed ember 1982. It was stopped in .y'Y of the decision by letter last January of this year until a deci I ` e 4 # ` r H ,1=' $ week. sion on its permanent use was '''' - , r t 'V "The Burnsville turn.' as it made. f ., had become known. diverted a , 4 '- percentage of departures from abatement method because the I i .%6 i one runway at Minneapolis -St. traffic situation has changed," ' $; x �a R + �'; * '-'. Paul International Airport from Case explained. Because there ,, 7 traditional flight paths in Bloom- has been "a tremendous in ` �� a ( ington and Richfield as a noise crease ' in traffic at the airport, it ,, a> :r te "� ,A, , - I) R was his belief that using the turn , i t there.ment measure for residents would create more noise than it �' - ' ` 47 F i?iY , a : a ' ' ' � \ " , y �b & ; Case. the ultimate authority on would relieve. • , �� £ the matter, went against the "It's a bad decision as far as i = recommendations of the Metro- were concerned," said Darrell 1. , l'M - politan Aircraft Sound Abate- Weslander, airport noise abate �. w ', ment Council and `WC. ment manager. "It was an effec ' � "It is no longer a vali noise tive noise abatement procedur y � f -- r �_� McRandall tends .:, n �r i _ The Secret Garden ' ' 4 • -...-...,c,,,4,,,,z,-.,,, ,. .- "` � � i �� J ' By CHRISTY DeJOY Members of the volunteer l • , , $` � group send letters to terminally - . � ' . i Crystal Christmas says she ill children and those with life - �$ °I4 , ,3� gets more from tending her roses threatening diseases. McRandall ;,r `�� ;' �� r than the flowers do in The Secret has decided to add children to the a Garden. list who have less- severe condi- '�� + a g . Crystal Christmas is the pen tions, yet who may be hospitaliz- I 1/4a1-4,- -�- Tyr i bOtk. e ► MCISS P FAA rejects plan to reduce airport noise over Richfield, Bloomington Against the recommendations of the meant that the runway would have Metropolitan Airports Commission, been used less often, sending more the Federal Aviation Administration traffic over south Minneapolis, Ea- (FAA) has decided to reject a pro- gan and Mendota Heights, Case said. posed turning procedure designed to • • reduce noise over Richfield and Officials from MAC and the Metro- . Bloomington by routing more planes politan Aircraft Sound Abatement • -over northeast Burnsville and Eagan. Council are disappointed with the FAA's decision, said Darrell Wes - The FAA decided against the proce- lander, noise abatement manager •dure because it would have in- for the MAC. .:.creased airplane traffic over south Minneapolis, said Les Case, air traf- "We believed that (the turn) was an fic manager at the Minneapolis -St. effective noise abatement action that Paul Airport tower. we could take here at a local level. We believe that it would have had an Under the plan, about one -third of overall benefit as far as noise reduc- the planes that take off on southwest tion," Weslander said. runway 4 -22 would make a turn .-• away from Richfield and Blooming - Case said that when the turn was ton toward northeast Burnsville. 1984, there wasn't experimentally 1983 and much traffic :,. However, putting more restrictions over south Minneapolis. on the use of the runway would have 11(1 city of czagan • 3830 PILOT KNOB ROAD, P.O. BOX 21199 - BEA BLOMQUIST EAGAN, MINNESOTA 55121 Moyor PHONE: (612) 454 -8100 THOMAS EGAN JAMES A. SMITH JERRY THOMAS THEODORE WACHTER Council Members THOMAS HEDGES City Administrator EUGENE VAN OVERBEKE November 4, 1985 City Clerk MR WALTER ROCKENSTEIN CHAIRMAN, METROPOLITAN AIRCRAFT SOUND ABATEMENT COUNCIL 6040 28TH AVENUE SOUTH MINNEAPOLIS MN 55450 Re: Eagan Recommendation to FAR Part 150 Study Dear Mr. Rockenstein: At the October meeting of MASAC, representatives of Howard, Needles, Tammen and Bergendoff reported on their compilation of FAR Part 150 suggestions and their recommendations for further study. When presenting the City of Eagan request that means be analyzed to insure better compliance with the 105 degree departure heading from 11L and 11R, Howard - Needles staff minimized its value by suggesting it would have only minor noise benefits. I respectfully disagree with this analysis. While it is true that Eagan and Mendota Heights do not have the affected population of South Minneapolis, the area has consistently generated in excess of one hundred complaints per month from its citizens in the warm weather season. A large number of these come from subdivisions outside the 105 degree corridor. I have observed aircraft on numerous occasions whose departure headings must be well in excess of 110 degrees. I strongly believe that means of encouraging compliance will have a profound effect on the noise environment outside the Eagan - Mendota Heights industrial corridor. It also seems reasonable to spend a limited amount of energy to insure the effectiveness of a THE LONE OAK TREE...THE SYMBOL OF STRENGTH AND GROWTH IN OUR COMMUNITY MR WALTER ROCKENSTEIN NOVEMBER 4, 1985 PAGE TWO noise abatement procedure inplace, thereby freeing the Council to spend the bulk of its time on substantive solutions for the rest of the airport's neighbors. Thank you for your kind attention to this matter. Sincerely, Thomas L. Hedges City Administrator TLH /jj cc: Ray Glumack, Metropolitan Airports Commission Les Case, Federal Aviation Administration Linda Barton, City of Burnsville Kevin Frazell, City of Mendota Heights Eagan Airport Noise Committee Members lr � ( city of eagan 3830 PILOT KNOB ROAD, P.0. BOX 21199 BEA BLOMQUIST EAGAN, MINNESOTA 55121 Mayor PHONE: (612) 454 -8100 THOMAS EGAN JAMES A. SMITH JERRY THOMAS THEODORE WACHTER Council Members THOMAS November 4, 1985 CityyAdmin HE r EUGENE VAN OVERBEKE City Clerk LES CASE FEDERAL AVIATION ADMINISTRATION 6311 - 34TH AVENUE SOUTH • MINNEAPOLIS MN 55430 Re: FAA Departure Procedures - Twin Cities International Airport Dear Mr. Case: The Metropolitan Airports Commission has begun its FAR Part 150 Study, Airport Noise Compatibility Program through the offices of its consultant, Howard, Needles, Tammen and Bergendoff. The purpose and intent of this study is to introduce sound abatement procedures effective for the Twin Cities International Airport and to insure that the airport's municipal neighbors make efforts through land use planning and zoning to prevent incompatible land uses in high traffic areas. This purpose is commendable and the City of Eagan is taking full opportunity to participate in the meetings pertinent to the study. A concern arose, however, during staff discussions with Howard - Needles representatives. Briefly stated, the airport's consultant has focused its attention on insuring noise compatible land uses within a computer generated Ldn 65 contour. The City is certainly willing to do this for the mutual benefit of residents and the airport. The assumed flight paths which generated this contour are at issue, however. If the FAA does not strictly adhere to the departure corridors assumed, the contour boundaries are invalid. Long range land use planning cannot be changed in the short term. The matter of only a few degrees in a departure heading can spell the difference between a pleasant residential setting and a severe noise problem. Therefore, it is essential that our Airport's Commissioners and elected officials understand that controlled operations are equally important as controlled development. By this, we do not mean regulation per se. We mean an adherence to accepted sound - abating departure corridors which make the contour boundaries valid. THE LONE OAK TREE...THE SYMBOL OF STRENGTH AND GROWTH IN OUR COMMUNITY RAY GLUMACK NOVEMBER 4, 1985 PAGE TWO To encourage such adherence, the Eagan Airport Noise Committee requests that additional navigational aids be installed down range at 105 degrees from Minneapolis -St. Paul International Airport's parallel runways 11L and 11R. The City has made a good faith effort with our neighbor, Mendota Heights, to keep clear a path southeast of the airport capable of absorbing over half of all departing and arriving aircraft. It is important that the Metropolitan Airports Commission and the Federal Aviation Administration take whatever action is necessary to use it appropriately. Thank your for your kind attention to this matter.... Sincerely, Thomas L. Hedges City Administrator TLH /jj cc: Senator Rudy Boschwitz Senator Dave Durenberger Representative William Frenzel Governor Rudy Perpich Senator Howard Knutson Representative Art Seaberg Airport Noise Committee Members Linda Barton, City of Burnsville Kevin Frazell, City of Mendota Heights b F T ,, i,�� c of eagan 3830 PILOT KNOB ROAD, P.0. BOX 21199 - BEA BLOMQUIST EAGAN, MINNESOTA 55121 Mayor PHONE: (612) 454 -8100 THOMAS EGAN JAMES A. SMITH JERRY THOMAS THEODORE WACHTER Council Members THOMAS HEDGES November 4, 1985 City Administrator EUGENE VAN OVERBEKE City Clerk RAY GLUMACK METROPOLITAN AIRPORTS COMMISSION 6040 28TH AVENUE SOUTH MINNEAPOLIS MN 55450 Re: FAA Departure Procedures - Twin Cities International Airport Dear Mr. Glumack: The Metropolitan Airports Commission has begun its FAR Part 150 Study, Airport Noise Compatibility Program through the offices of its consultant, Howard, Needles, Tammen and Bergendoff. The purpose and intent of this study is to introduce sound abatement procedures effective for the Twin Cities International Airport and to insure that the airport's municipal neighbors make efforts through land use planning and zoning to prevent incompatible land uses in high traffic areas. This purpose is commendable and the City of Eagan is taking full opportunity to participate in the meetings pertinent to the study. A concern arose, however, during staff discussions with Howard - Needles representatives. Briefly stated, the airport's consultant has focused its attention on insuring noise compatible land uses within a computer generated Ldn 65 contour. The City is certainly willing to do this for the mutual benefit of residents and the airport. The assumed flight paths which generated this contour are at issue, however. If the FAA does not strictly adhere to the departure corridors assumed, the contour boundaries are invalid. Long range land use planning cannot be changed in the short term. The matter of only a few degrees in a departure heading can spell the difference between a pleasant residential setting and a severe noise problem. Therefore, it is essential that our Airport's Commissioners and elected officials understand that controlled operations are equally important as controlled development. By this, we do not mean regulation per se. We mean an adherence to accepted sound - abating departure corridors which make the contour boundaries valid. THE LONE OAK TREE ... THE SYMBOL OF STRENGTH AND GROWTH IN OUR COMMUNITY RAY GLUMACK NOVEMBER 4, 1985 PAGE TWO • To encourage such adherence, the Eagan Airport Noise Committee requests that additional navigational aids be installed down range at 105 degrees from Minneapolis -St. Paul International Airport's parallel runways 11L and 11R. The City has made a good faith effort with our neighbor, Mendota Heights, to keep clear a path southeast of the airport capable of absorbing over half of all departing and arriving aircraft. It is important that the Metropolitan Airports Commission and the Federal Aviation Administration take whatever action is necessary to use it appropriately. Thank your for your kind attention to this matter. Sincerely, Thomas L. Hedges City Administrator TLH /jj cc: Senator Rudy Boschwitz Senator Dave Durenberger Representative William Frenzel Governor Rudy Perpich Senator Howard Knutson Representative Art Seaberg Airport Noise Committee Members Linda Barton, City of Burnsville Kevin Frazell, City of Mendota Heights JAMES J. HOWARD, NEW JERSEY, CHAIRMAN GLENN M. ANDERSON. CALIFORNIA GENE SNYDER. KENTUCKY ROBERT A ROE. NEW JERSEY JOHN PAUL HAMMERSCHMIDT, ARKANSAS JOHN B. BREAUX. LOUISIANA BUD SHUSTER. PENNSYLVANIA NORMA OY. MINETA, BERSTAR. C , M INNE NE A NEWT G INNGRICH, GEORGIA D. MINNESOTA JAMES committee on public Works and transportation L OERSTARINNETT IGRICH, G HENRY J. NOWAK. NEW YORK WILLIAM F. CUNGER. JR., PENNSYLVANIA ROBERT W. EDGAR, PENNSYLVANIA GUY MOLINARI. NEW YORK • ROBERT A YOUNG. MISSOURI E. CLAY SHAW, FLORIDA ttonze of 7Rtpresentatines NICK ICK JOE RAHALL II, WEST VIRGINIA BOB McEWEN. OHIO � DOUGLAS APPLEGATE OHIO THOMAS E PETRI, WISCONSIN Ae RON DE LUGO. VIRGIN ISLANDS DON SUNDQUIST, TENNESSEE Rom 2� V,� GUS SAVAGE, ILLINOIS NANCY L JOHNSON, CONNECTICUT o 'Rayburn font Office )3uilding FOFO I.F. SUNIA. AMERICAN SAMOA RON PACKARD, CALIFORNIA DOUGLAS H. BOSCO. CAUFORNIA SHERWOOD BOEHL6R7, NEW YORK 3�ashington > Be 20515 JIM MOODY. WISCONSIN TOM DELAY, TEXAS ROBERT A. BORSKI, PENNSYLVANIA SONNY CALLAHAN, ALABAMA JOE KOLTER. PENNSYLVANIA DEAN A GALLO. NEW JERSEY TELEPHONE AREA CODE 202, 225 -4472 TIM VALENTINE, NORTH CAROUNA HELEN DELICH BENTLEY, MARYLAND EDOLPHUS TOWNS. NEW YORK JIM UGHTFOOT. IOWA WILUAM O. LIPINSKI. ILLINOIS MICHAEL A. ANDREWS. TEXAS J. ROY ROWLAND, GEORGIA June 18, 1985 .: ROBERT E. WISE JR., WEST VIRGINIA SALVATORE J. D•AMICO, SPECIAL KENNETH J. GRAY. IWNOIS COUNSEL AND STAFF DIRECTOR _ �" M•x CHESTER G. ATKINS, MASSACHUSETTS RICHARD J. SULUVAN, CHIEF COUNSEL PETER J. VISCLOSKY, INDIANA CLYDE E. WOODLE. CHIEF ENGINEER :1`\fi.0 JAMES A. TRAFICANT. JR.. OHIO MICHAEL J. TOOHEY. MINORITY STAFF `s CARL C. PERKINS. KENTUCKY DIRECTOR Honorable Thomas L. Hedges City Administrator City of Eagan P.O. Box 21199 Eagan, MN 55121 Dear Mr. Hedges: Thank you for letting me know of your views on DOT /FAA policies regarding compliance with noise emission regulations. My concerns about the Administration's policies are very similar to yours. On May 22 and June 12, the Subcommittee on Aviation held hearings on this matter. As the Subcommittee considers what the most appropriate course of action should be, be assured that we have your views in mind. Again, thank you for bringing your concerns to my attention. With your support, I am hopeful that noisy, non - compliant airline fleets will be brought into compliance in the near future. Sincerely, A • 11111 I NORMAN INETA C ha i rm Subcom . ttee on Aviation • ..,_ , . . ,... _. dbirni . __ 6047.-- _ . ` , v r f _. ,. ,.... f L , ...,. ......,..... • .,. .. • ... . . . . . , .: . • . .... .. _ . ... . ...... . . .. ...... . . � Tew poi , .� . _ ad measue�nren cac rabi1itie fo 'it I r env not V i } f .. ✓' ti� R r t • «• ✓ I'/ Y - 1, • - 000 <0NY k x1 ' tiy Y . S +. r;. '', a' '. ..`a`.. ® ® DO >O<>0' " r s. ° } r � -' fi 1 a " - ` ` -y � ", `.- ff.s V C O x � ' z "',; -" -� . 'r"#1u4. 1iYt g } 4'+ c '''...--`?".-1.1. , ^ ;p: f v � l � l\\ l \O `� 0 "' nr'Y ' M s -ci" `*r :-.1 a'. ? L .�,: { .{ t i ; r C J - a '> - U \ % _ f,.. ,� • `..x. 3" 5'- ...,, * E • 4 - '* j�+ CYy �„t : fi r ' �e . Q / '.a'$"3 i2' r ` ' J -T `i•`w- - ,. ' 3 a .+£ y z fi St, .,, e�N p V � V ) 3" :15}+x. -i R Ti ' - ' _ _.,.,-,-,„ ,,,,r, , , , „.., . • : 1..- i ,,.... , . .:- .., .,. - .........,„,--"----1 ( irf" FJ . 'S� f �+ METROSONICS A Completely . Integrated Sy .. _ . Headphones Audio Tape Digital Microphone p Recorder Printer r — Audio Tape Recorder 0\0/0 AUDIO OUTPUT DIGITAL Digital OUTPUT Computer Signal Source INPUT P d ir 6O I 1 r Digital Tape O POWER Recorder L ) Anemometer Modem Digital AC Mains 12 V Battery Manual Sequencer Mb Switch - db -604 input and output ports adapt to a multiplicity of terminal equipment. This permits configuration of customized systems to meet individual application needs. State -Of- The -Art play. Hardcopy documentation is available on -site with an 1 optional dp-421 Portable Printer. To allow return of the db -604 to a central laboratory for readout, all stored test Features data is protected for at least 30 days. The db 604 Sound Level Analyzer is a unique micro- Fully preformatted results can be dumped to any RS -232C computer for measuring, analyzing and documenting all compatible printer, or to a dumb terminal or a computer. compu airport, community and industrial noise. The db -604's full keyboard permits it to function as a termi- types t r for m Unique features of the db-604 include its ability to pro- nal itself for signing on to a computer. vide a complete time history profile of noise signals over Table 1. Acoustical descriptors available with the db -604 extended periods and to compute all standard single - number descriptors. Obsolecent proof, the db-604 allows Continuous Multiple Single 24 -Hour new noise descriptors to be accountable as they are Testing Interval Event Data adopted. An optional real -time detector assures accurate (overall test) measurement of impulse and impact noise. Lazo (3, 4, 5) X X X X As a stand -alone instrument, the db -604 provides direct 1 X X X X readout of both real -time and historical data on its large, Time of L X X alpha- numeric liquid crystal display. Hard copy is available on site with the Metrosonics dp-421 Portable Printer. The Lin and Lin(T) and X system is also compatible with other printers and compre- time above threshold hensive data acquisition systems, such as airport noise CNEL and CNEL(T) and X monitors. The db-604 is an excellent modernization time above threshold replacement for aging airport monitor stations that do not 141 X meet today's technological requirements. any N's Up to 8 I-N present N's A Stand Alone Instrument Amplitude Dist X Calendar Time X X X The db-604 is all that is needed for short -term measure- Elapsed Time X X X X ments, including spot checks of aircraft noise, investigations of community noise complaints and periodic surveys of 'db -604 RTD displays Lo instead of Lmax occupational noise exposure. The system can operate for at least 48 hours on its inter- Use It Remotely nal batteries. For longer tests. it can be operated on 1 15/230 Vac or Vdc. Test specifics, listed in Table 1, can be read during or after A powerful new capability is achieved by installing the • test on the db -604's large alpha- numeric liquid crystal dis- db-604 at remote sites and interfacing it via a data link to To Meet Airport, Communi and Industrial Needs. . a central terminal or computer. The data link can be a dedi- optional, and is used to discriminate against inputs below cated phone line and modem, or a dial -up modem and an the programmed (T) level. existing telephone line. The system can also be remotely CNEL and CNEL (T)— Community Noise Effective Level. programmed, operated and read out. Similar to Ldp, with addition of 5 dB increment between 7 This type of low -cost semi - permanent installation brings and I 0 PM. Threshold (T) is optional. many of the same benefits as expensive, fixed monitoring systems. As a cornerstone for successful new community SEL —Sound Exposure Level. Sound level or (L inte relations programs, it enables airport operators to eco grated over a specified period of time has a particular nomically give personal attention to individual complaints sound energy associated with it. SEL represents the sound about aircraft or other noise problems. level that will produce that same energy when it occurs for one second. Systems Upgrade A S Lax —Also called Single Event Noise Level. Similar to SEL. pg ir p ort 9 Commonly applied to passby noise of aircraft and vehicles. Many sites have fixed monitoring systems which have gaps To distinguish a specific source from background noise, in area coverage, or are able to process data to modern measurement begins when a specified threshold level is noise descriptors. Integrated into such existing systems, the exceeded, and ends when the level falls below threshold. db-604 can be the basis for retrofit programs to upgrade An additional discriminant may be selected by stipulating system performance to today's needs. that the time above threshold must exceed a preset min- imum. in order to screen out transients, such as horns and Multiple Data barking dogs. HNL— Hourly Noise Level. The hourly L computed for Gathering Modes sound levels that exceed a preset threshold. IN Percent exceedance level. The level in dB exceeded N The db-604 Sound Level Analyzer offers four data gather- percent of the observation period. ing modes to simplify the evaluation of noise history, and to Lmax— Maximum sound level observed, with Fast or Slow assure that all meaningful events are fully described. The response. modes are available independently or simultaneously. Continuous Testing: Entire time of observation is treated Lpk—Unweighted peak amplitude of the acoustic waveform. as one continuous measurement period. This mode is always operational. Applications Multiple Interval: Analyses are performed after each mea- AIRPORT Runway Monitorin surement interval, e.g. Hourly Leq. Y g Individual Aircraft Analysis Single Event: Analyzes random events, based on ampli- Helicopter Siting tude exceedance criteria. Flyover Measurements 24 -Hour Data: Computations performed daily, typically at Sonic Boom Monitoring midnight. ENVIRONMENTAL, Synoptic Studies Table 1 shows the acoustical parameters avail- COMMUNITY Land Use able in each of the modes. Noise Ordinance Construction Lot Line HUD Measurements No Descriptors TRANSPORTATION Highway Location _ Environmental Impact Statements Lavg (3, 4, 5)— Equivalent or average sound level obtained Barrier Evaluation by averaging instantaneous sound levels in accordance with Railroad Switching Yards the selected exchange rate (3, 4, or 5 dB). Averaging time is FHWA Measurements optional. INDUSTRIAL Hearing Conservation Exchange Rate —A concept based on the fact that a con- Machine Noise Reduction stant sound level occurring for a fixed time duration will Plant Boundary Line have a fixed amount of acoustic energy associated with it. If the amplitude of the sound (L is increased or decreased RESEARCH Artillery Blast by 3 dB, the duration of the sound must be halved or dou- Evaluation of Noise Annoyance bled to produce the same amount of energy. By analogy, Gun Blast biased averaging schemes have adopted 4 dB (Ldod) or 5 Quarry Blast dB (Losha) increments associated with halving and doubling. Energy Analysis Ld and Ld (T) —The 24 -hour, day /night L Includes a 10 Statistical Distribution dB penalty increment added to observed sound level PRODUCT Specification Evaluation between the hours of 10 PM and 7 AM, on the premise Product Noise Reduction that this period covers the sleeping hours. Threshold (T) is Machine Cycle Analysis h 1 METROSONICS INC. GENERAL PRODUCTS DIVISION P 0. BOX ^ 23075 "FLOC ^ES: ER. N 14692 Ideal For Instrument Laboratory Prom Dis .A►nd 1 Envir Modes Of ETRO Measurements Operation: CI I Convenient Local a. M Keyboard Operation Logging °" two l00 Keyboard operation is user - friendly and goof- proof. The user , . ® is prompted through program, control. and interrogation modes by keyboard /display interaction, making the db -604 Terminal 21 readily understood by first -time users. The operator is alerted to entry of illegal values and illegal modes of operation. All programmed test parameters are retained with battery loolloli 111 II backup so that it is unnecessary to program the unit for each Remote test. It is also quite easy to review program conditions and stored data before, during, or after a test is completed. Easy to Operate thresholds for energizing the tape recorder or external alarm annunciators. Extremely easy to program, operate and read out, all oper- ations are simplified by keyboard /display interaction and are Real -Time Detector prompted and guided by English- language messages. For fur- ther operator convenience, all control keys are grouped in A real -time detector (RTD) version of the db -604 is available tc accordance with their system function. assure accurate measurement of impulse and impact sounds. including sonic booms. blasts, artillery, punch presses. and Fl exible Input Capab •ty forging operations, where peak pressures in excess of 90 dB above ambient levels can occur. Acoustic signals can be measured with an analog detector The RTD samples input signals at 65,536 samples /second over a 96 dB dynamic range. Fast or Slow averaging, and A or and provides true RMS detection without crest factor lim- C- weighted or Flat response, are selectable from the key- itation, over a dynamic range of 100 dB. board: circuitry meets ANSI and IEC specifications for acoustic �� instrumentation. Power is furnished for preamplifiers and Met- Inhibit Data Lo • rosonics, B & K. GR or other microphone cartridges and Logging preamplifiers. At low ambient noise levels, excessive wind velocity can induce false noise signals at the microphone. The db -604 can Easy Calibrate accept anemometer outputs to interrupt data taking during y these occurences: allowing only valid data to be logged during A unique digital calibration technique normalizes the system unattended operation. for any microphone sound level meter, audio tape recorder, or other signal source. The operator needs only enter on the Reduce Testing Costs keyboard the calibration level of the acoustical calibrator. The db-604 immediately normalizes its output for direct reading, In its SCHEDULED RUN mode. the db -604 can operate and displays the system's overall dB range. unattended in the field. conducting a single test over a preset period of time, or logging daily data over a preset period, Monitor The Input such as a workshift. p Since no setting up is required, the db-604 can be di ;ed To satisfy requirements that the qualitative nature of a sound to measurement sites by non technical personnel, thus reduc be identified, an audio output of the signal is provided from ing the cost of testing considerably. the db-604 for connection to headphones and tape recorders. • • Additionally, a transistor closure is provided at user selectable unctions Functions Performed On iy Output Data Test Set -Up Real Time Clock db-60 Display Control: CS ANAL .r Select a el CI ® Parameters re�Uf (I � cnia�� is 1 r Or Data 1 MI ESN ESN MA ESN Ma ESN tSa ISM EMI MN n a Ei al al mi El Eig gm p iP ice 0 Position 121 ®.° El El ." El ®®'° ° ® Cursor j2: gi ® I NM _ ® • 111 . - Extra Features Enhance It's Usefulness Large Memory Capacity Visual Data Display A large internal memory assures adequate storage capacity All data and reports can be viewed on the db -604's front for any measurement requirement. Up to 1221 consecutive panel 2 line, 20 character per line alpha- numeric liquid crystal time intervals can be logged if no L values are saved, and up display. Comprehensively annotated data is provided rather to 707 intervals if eight L values are saved. It can store up to than just numbers alone, as in previous technology instru- 790 single events, and up to 40 days of 24 -hour statistics. ments. Extra memory capability is offered as an option to double the amount of statistics that can be saved. �y"` r - Instantaneous I 1 v ., a te • r:F Preformatted Reports , 4 , _ - M _ _ - st ) w. Preformatted reports can be generated for printout on * ;' ' K i - 'i l 4• the dp-421 Portable Printer and other RS -232C compatibles -�,- printers, terminals and computers. This data is available r :W..4 .,. q T -H..- i , to com for further data processing or for special 'j iy4R4� ' it" ; III 1 ' ' ^� ' ` I formatting. " : r } Operators can request any or all of the following reports: 1.4'.' '' 1 „ I Overall Test Statistics. Multiple Intervals, Single Events, and , , 24 -Hour Data. Each printout contains a 4 -line corporate r �. ••' s `. � iu.1wa r .+ ,. header and two lines of test description. To assure data integrity, the report also includes the serial number and soft- Built For Outdoor Use 1 version of the db -604, as well as the exchange rate, filter v „nting, and detector response employed during the test. Housed in an environmentally - gasketed heavy gauge alumi- The Multiple Interval report also includes a graphical print- num case, the db-604 will withstand permanent installation out of the time history profile of average and maximum levels. outdoors. Its robust case is protected by hasp -like pad - Reports are available at any time, without interrupting the lockable latches that will withstand rough handling experi- acquisition of current data. enced during transport to measurement sites. ki METROSONICS INC. GENERAL PRODUCTS DIVISION PO BOX 23075 • P0CHESTEA. N V 1 4692 T ELE0PONE 716 334 7300 • TELEX 6533.8 Compr ehens i ve R tPli R P . , DETECTOR:STAHDARIT DOUBLING RATE:3 dB FILTER: A UGHT RESPONSE: SLOW ANALOG INHIBIOFF ..... .-- ALPRH: OFF mom GAIN: 0 dB DATE: 06,24,85 TeSt 7.": TIME: 13:31:08 m .. r.:T. set-up • and .........., 1 . TEST STARTING DATE: 06,21,85 TEST STARTING TINE: 23:30:20 overall _.......,-..._ ......- ELAPSED TIME 02 DAYS 08:29:41 , • results . ....„,_ , . THE DISPLAY RAMGE. tr. 32.8 TO 128.848 Lavg. 58.8 dB 02 DAYS 08:29:41 Lean. 89.3 dB 023:35:12 06 AMPLITUDE DISTRIBUTION : = - TOTAL SAMPLES = 3254096 i = : dl SAMPLES % OF TOTAL 34 Amplitude 4250 . .13 35 75302 .. 2.31 .... , , . '36 133439 .... 4.10 - r.:7__T,- 37 165798 ..... 5.09 distribution •-•.:.:-%. -""'" r - . " '' 39 138135 ...... 4.24 40 132227 •... 4.06 . • 41 121661 ..... 3.73 - " ' 42 128234 .... 3.94 -: •-'.."' -,.:.. . - • ' MULTIPLE INTERVAL DATA INTERVAL LENGTH 00:30:00 L9( 3) THRESHOLD IS 33.0dB MUltiPle L(1). 0.0 L(2).10.0 L(3)=25.0 L(4)=50.0 •-•••.* - 7. - - " - START Lavg Lavg(t) LI L2 L3 L4 Interval TIME ET Lean . . 01 06 66.2 66.2 89 45 39 38 Data 23:30:20 00:30:00 89.3 . , SINGLE EVENT DATA . ...... -....-..- SIM6LE EVEHT THRESHOLD IS 80.0dB ..... • ... . MINIMUM DURATION IS: 00:00:04 Single ....... _.-- - 283' DATE ELAPSED Lavg Lax I.:ban . TIME TIME Event 01 06 00:00:15 86.3 98.2 89.3 23:35:07 Data 02 06,22,85 00:00:13 86.3 97.4 88.8 06:38:51 ..- - •- -• TWENTY FOUR HOUR DATA ...• DAILY CALCULATIONS AT 00:00300 ---- Ldn THRESHOLD IS: 33.04) - 24 CHEL THRESHOLD IS: 33.048 . i. DATE Lawg Lnax TIME Ldn(t) ET Hour. ::..---,,-;;;.r ET Ldn CNEL(t) 1 CNEL 1 .' . ... .. 06,22,65 66.2 89.3 2335:12 76.2 00:29140 Data . --- -: 00:29:40 76.2 76.2 00:29:40 • 76.2 Descriptions And Specifications Descriptions Detector: Standard. true RMS. 17 dB headroom over full scale RMS. 16 samples per second sampling rate post detection. db -604 ENVIRONMENTAL Crest Factor: Better than ANSI S1.4 -1983. IEC -651 & IEC -804 SOUND LEVEL ANALYZER ANSI S1.4 -1983 and IEC -651 Compliances: Meets relevant sections Precision microcomputer based sound level acquisition and anal- Sound Level Computation: 16 times per second. Fast or Slow ysis system. Performs simultaneous single event. multiple interval. response. 24 -hour, and cumulative data analysis. Includes 40 character Accuracy: +/— 0.5 dB over full specified range. alpha- numeric. liquid crystal display and RS -232 interface. Utilizes standard true RMS detector, dynamic range of 96 dB. db -604 Sound Level db -604 RTD ENVIRONMENTAL SOUND LEVEL ANALYZER Analyzer - Real -Time Same features as the db-604 but with a digital averaging true RMS detector in lieu of the standard detector. 65.536 samples Detector per second sampling range, 100 dB dynamic range without crest • factor limitation. INPUT db -604 Specifications Input Signal Range: IOuV to 3.7Vp Dynamic Range: Greater than 100 dB OPERATING MODES Noise Level: I OuV RMS, A- weighted (referred to input) Normal Operating Mode: Data acquisition. Program. Display and SIGNAL PROCESSING Output. Frequency Response: A and C- weighted to ANSI SI.4 -1983 Remote Mode: Remote Mode permits the db-604 to be operated Type I completely by a remote device through the RS -232C interface. Detector: RTD True RMS digital averaging, 65.536 samples per (All operating functions can be accessed by the front panel second sampling rate in the remote mode.) Crest Factor: Unlimited (Within Input Signal Range) Terminal Mode: The db -604 can function as a dumb terminal Burst Response: Greater than 100 dB with an 80 character buffer. Sound Level Computation: 16 per second Calculations Resolution: Sound level, Lav Lmax. Lpk IRTD only). Accuracy: +/— 0.5 dB over full specified range. Ldn. Ldn (T). CNEL, CNEL (T), SENEL, with 0.1 dB resolution. L to Digital: Serial communications interface provides RS -232C com- nearest 1 dB ( "n" selectable in increments of 0.1%). Amplitude patible baud rates of 300, 600, 1200. 2400, 4800, and 9600. The distribution in 1 dB bins. db-604 uses an ASCII cntl- S /cntl-0 protocal. All displayed or Exchange Rates: Selectable 3, 4 or 5 dB doubling. stored data formatted for 48 or 80 column. Continuous Testing: Sound level Lavg. Lmax, time of Lmax. Lpk Analog: Unweighted only, with programmable 0. 20, 40, or 60 dB (RTD only), time of Lpk, any L and amplitude distribution may gain: Output impedance: 600 ohms. Vout max: 3 Vp-p into 600 be read during or after test. ohms. Multiple Interval: Computes Lavg, Lavg (T), Lmax. Lpk (RTD only), ALARM and up to eight preset L values for each interval. Interval lengths are selectable from 15 seconds to 24 hours. 1221 consecutive Electrical: Reverse bias protected open collector transistor. time intervals if no L values selected: 707 intervals if 8 L values Absolute Maximum Voltage: 50V selected (assuming Single Events are not enabled.) With the mm- Absolute Maximum Current: 200 mA 604 -16 option the consecutive time intervals are extended to INTERNAL CLOCK 2711 and 1 564 respectively. Single Event: Program for any threshold and duration. Computes Features: Month: Day: Year: Hour: Minute: Second: 24 -hour L L Lpk (RTD only). L ( SENEL), onset time, and duration clock. auto leap year compensation. for up to 790 events (assuming Multiple Intervals are not Elapsed Time: Days: Hours: Minutes: Seconds enabled). With the mm- 604 -16 option the memory is extended to Clock Accuracy: 0.02% • • 1729 single events. COMMON INPUTS 24 -Hour Data: Computes Lavg. L and time of occurence. Ldn . Ld (T), time of Lmax, time of Lpk, and time over threshold. CNEL Input Impedance: 1 OK ohms and CNEL (T) time over threshold for up to forty periods. Can be Analog Inhibit Input: Programmable for 5 to 99 mph or 0.5 to programmed to compute daily values at any time of day and 9.5V external inhibit signal. select threshold for Ld (T) and CNEL (T). Digital Inhibit Input: Ground input pin to inhibit. Scheduled Run: Daily or I time. Programmable for any start time Absolute Maximum Input: +/— 10 Vac or DC and any stop time for daily run, or for any start time and date CALIBRATION with any stop time and date for 1 time. INPUT Field Calibration: Programmable for output acoustical calibrator. Input Signal Range: 5uV to 0.315V RMS USER INTERFACE Dynamic Range: 96.0 dB Display Type: Alpha- numeric liquid crystal display, 2 lines. 20 Noise Level: 2.5uV RMS, Linear (referred to input) characters. each line 0.25" height. SIGNAL PROCESSING Display Working Temperature: —10 deg C to 50 deg C. Keyboard: Sealed membrane keyboard with tactile feedback. Frequency Response: A and C- weighted to ANSI SI.4 -1983 Type 1: Linear 1.5 dB down at 10 Hz and 20 KHz. Continued on back page 1111 METROSONICS INC. GENERAL PRODUCTS DIVISION P 0 BOX 23075 • ROCS +ESTER N V 14692 TELE6 -05E 7 334 -7300 • TELEX 853348 Accessories Extend The Versatmty '' Of The db-604 Specifications dp -421 Digital Printer: 48 column printer for recording db -604 output. Packaged in environmental case with internal battery for Continued field usage. dp -421 Printer Paper: Electrostatic sensitive paper for the dp- Internal Power: Rechargeable sealed lead acid batteries. Greater 421 Digital Printer. than 60 hours (standard detector. 40 hours db -604 RTD) oper- hs -604 Headphones: To monitor audio signal from the db -604. ation between charges. Auto shutdown circuitry allows retention mk -604R Pendant Microphone: Vi inch diameter ceramic micro - of all stored data and programmed parameters for additional 30 phone on five-foot miniature cable (other cable lengths on days. External Power: 115/230 Vac +/- 10% (Internally Selectable). request). 50/60 Hz. 13 Watts, or 1 116 Vdc 27 Watts. mk -GR Microphone Assembly: GR 1962-9601, 'h inch electret AC Charging Times: 24 Hours (30 Hours if unit is on). With RTD microphone with 1560-P42 preamplifier, windscreen and 25 feet option 36 Hours (60 hours if unit is on). of interconnecting cable (ca -604). DC Charging Times: 10 Hours 112 Hours if unit is on). mm- 604 -I6 Memory Module: Increases storage capacity for Battery Voltage: Displayed to 0.1 V Resolution. additional single event. multiple interval and Ln intervals. Microphone and Preamp Bias Voltage: ws -301 Windscreen: for mk=604R Microphone. Useful for out- door measurements: protects microphone. Normal: 18 Vdc ( +/- 10% initial accuracy). ws -604 Wind Sensor: Detects wind velocity and automatically B & K option: 28 Vdc ( +/- 10% initial accuracy). inhibits signal when the wind velocity exceeds a programmed (in lieu of Normal): 200 V polarization voltage. value. Complete with 25 -foot cable. ENVIRONMENTAL /MECHANICAL Operating Temperature: - 20 deg to C to +50 deg C (-4 deg F Hard Copy Documentation to + 122 deg H. Storage Temperature: - 30 deg C to + 70 deg C (-22 deg F to `y +158 deg F). With The Enclosure: Aluminum environmental waterproof enclosure with r� , - ., p ype, padlockable latches. hasp type. dp-421 Dimension: 9.75 x 13.75 x 9.25 in. (24.8 x 34.9 x 23.5 cm1. ' �� Weight: 21 lbs. (9.5 kg), Standard Version: 24 lbs. (10.9 kg). RTD 4. :`r;;.:; Version. Portable -- a Humidity: To 90% non - condensing. Digital a - Specifications subject to change without notice Digital ��- db-604 Accessories Printer \ ,__ ca -601 Analog Inhibit Cable: 25 -foot interface cable for external The dp-42 I portable Digital Printer provides a hard copy, fully . analog inhibit signal sources, e.g. anemometers. etc. annotated printout of all the data that appears on the db -604 ca -602 Digital Inhibit Cable: 25 -foot interface cable for external display. This saves time over manually recording the data, and it digital inhibit signal sources. assures the highest degree of data integrity. ca -603 RS -232 Output Cable: 8 -foot cable to interface db -604 to All printing functions are controlled by an internal micro - external computer via RS -232C. processor. Modern electrostatic printing eliminates ink, ribbons ca -604 P42 Input Cable: 25 -foot interface cable for Gen Rad P42 and hammers, thus providing high reliability and true portability. Preamplifier assembly. The dp -421's 96 character set and RS -232C interface enable it to ca- 605 -25 Extension Cable: 25 -foot cable for mk-604R also be used for other applications. Microphone. ca- 605 -95 Extension Cable: 95 foot cable for mk-604R dp-421 Specifications • Microphone. ca- 606 -25 Extension Cable: 25 -foot cable for mk -GR or P42 Type Number of Columns: 48. Preamp. Character Size: 0.106 inches (.27 cm). ca- 606 -95 Extension Cable: 95 -foot cable for mk -GR or P42 Type Character Set: Alpha- numeric 96-character ASCII. Preamp. Line Spacing: 5 lines per inch (2 lines per cm). ca -607 Terminal Interface Cable: (supplied with db -604) 3 -foot Paper Width: 4.7 inches (12.0 cm). "Null Modem" Cable to interface db-604 to RS -232C compatible Paper Type: Non-heat-sensitive electrostatic. terminal devices. e.g. printers. modems, etc. P yP ca -608 External D.C. Power Cable: Connects the db -604 to 12V Enclosure: Rugged anodized aluminum carrying case, gasketed power sources. cover with carrying handle. 9 x 12 x 5 in. (23 x 30 x 13 cm). c1 -304 Acoustical Calibrator: Used to field calibrate the '/ inch Power Supply: Internal 12 V battery, rechargeable from 1 15/23 mk -604R Microphone and db-604 Environmental Sound Level Vac mains. Analyzer. Weight: 12 lbs. (5.5 kg). II METROSONICS INC. GENERAL PRODUCTS DIVISION P.O. BOX 23075 • ROCHESTER, N.Y. 14692 TELEPHONE 716 - 334 -7300 • TELEX 653348 PUBLIC SERVICE RELEASE DRAFT QUARTERLY INFORMATIVE ITEM AIRCRAFT NOISE Eagan residents enjoy the convenience of living minutes from the Twin Cities International Airport. The price for this convenience is the periodic nuisance of aircraft noise. If you are bothered by an aircraft noise event, you can register a complaint with the Metropolitan Airports Commission and you can express your concerns to your local officials. The City of Eagan encourages you to report excessive noise to help insure a sound - controlled environment. Metropolitan Airports Commission Noise Complaints: 721 -9411 Control Tower: 726 -9255 Runway Information Hotline: 726 -8170 City of Eagan Jon Hohenstein: 454 -8100