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Review of existing Section 106 Agreement - Thanet District Council

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which 1,980 were by dedicated freighter aircraft (B747-200/DC8/IL76), 840 bylarger passenger aircraft (MD11 or equivalent), 2260 by B757/B767 (orequivalent) and 9,800 by B737 (or equivalent).Given the change in the actual traffic mix (eg a decline in the level <strong>of</strong>dedicated freighters and an increase in the number <strong>of</strong> B737 movements), wesuggest that new contours should be prepared for 2004 (based on actual data)and for 2005, 2006 and 2007 (using the most recent traffic forecasts).In terms <strong>of</strong> night noise, it is possible to prepare LAeq 8 hour noise contoursover the period 2300-0700. However, as the normal procedure is to averageall aircraft movements over the full 8 hour period, this may not necessarilyreflect the intensity <strong>of</strong> noise during the periods 2300-2400 or 0600-0700. Abetter method <strong>of</strong> establishing noise disturbance levels is to prepare a singleevent 90 dBA SEL contour based on an arrival or departure aircraft. The 90dBA SEL contour is recognised as the threshold <strong>of</strong> those at risk from sleepdisturbance from aircraft. It is recommended that these SEL contours shouldbe established for a departure and arrival by a Fokker F100 aircraft (in bothrunway directions). These contours, together with an analysis <strong>of</strong> the numbers<strong>of</strong> households affected, should be used for further discussions on future noisecontrols.EU00142:FINAL REPORT PAGE 24

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