TagMan-Acoustics and Noise(1)

WAY ALIGNMENT AND ARE AT DISTANCES OF 5JQQQJ 16J000J OR l~JQQQ FEET FROM THE END OF THE RUNWAYS. THE NOISE MEASU~EMENTS OBTAINED AT THESE SITES WILL BE COMPUTED TO ACTUAL NOISE EXPOSURE {ANE) VALUES TO PROVIDE CONTOURS OF NOISE IMPACT. PREDIC- TIONS FOR THE FUTURE WILL BE MADE AND A BACKGROUND NOISE SURVEY WILL HELP DEFINE NON~AIRPORT-GENERATED NOISE (VEHICULAR TRAFFIC AND INDUSTRIAL NOISE) AND COMPARISONS WILL BE MADE WITH THE INITIAL SURVEY MEASUREMENTS. USING INITIAL SURVEY FINDINGSJ A MORE COMPREHENSIVE MEASUREMENT GRID USING DIFFERENT SITES AROUND SEA-TAC WILL BE ESTABLISHED AND CALIBRATED RE- CORDINGS WILL BE MADE. RESULTING WILL BE A SERIES OF TABLES SHOWING THE NOISE DENSITYJ DURATIONJ AND FREQUENCY AT EACH MEASUREMENT SITE CAUSED BY FLY-OVERS. A RECOMMENDED ALTERNATIVE WILL BE PRESENTED AFTER ALL MEASUREMENTS AND EVALUATIONS OF ALTERNATIVES ARE COMPLETED. ALTERNATIVE LAND USES WILL BE EVALUATED IN CONJUNCTION WITH OTHER ENVIRONMENTAL DATA. PUBLIC PARTICI- PATION WILL BE IMPORTANT IN VALIDATING THE NOISE EXPOSURE CRITERIA AND GUIDELINES. THE CONSULTANTS SHALL ALSO CONSIDER AND DISCUSS STRUCTURAL VIBRATIONS CAUSED BY AIRCRAFT OPERATIONSJ INCLUDING EVALUATION OF THE REPORT MATERIAL PREPARED BY THE SCHOOL OF PUBLIC HEALTH AND COMMUNITY MEDI- CAREJ UNIVERSITY OF WASHINGTONJ AND THE HIGHLINE PUBLIC SCHOOLS. 5/2/73 eac community office • 253 SOJth 152nd. street • burien, wash. 98148 • ch 3-7033