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-16- <br />procedures based on tho 1.10 and 1,50 descriptors, The change to <br />the Leg descriptor will create thv need for some Adjustments to <br />these community noise programsl primarily in the form of new or <br />additional monitoring procedures, fl000vor, on balance, it is <br />reasonable for the Agency to make a change from the statistical <br />descriptor to the Leg In order to take advantage of the benefits <br />of the descriptor described above. <br />In addition to eliminating the L10 and L40 descriptor from the <br />noise standards, the Agency is proposing to change the numerical <br />values of the noise standards. The proposed new numbers Us <br />as follows) <br />,ag <br />... asii.4 <br />1 63 Leg <br />53 Lag <br />7 68 Leg <br />68 Lag <br />3 78 Leg <br />78 Lag <br />In each case, the number is three d8A above the existing L50 <br />standard , Hownver, this does <br />not reproaent a relaxation of the <br />existing standards, but rather <br />a numerical adjustment needed <br />bocause of the change to an Leg <br />descriptor, The level of <br />protection remains the same As <br />the existing ru13s. The <br />adjustment was arrived at by comparing measured noise using both <br />statistical and Leg descriptors, For most types of noise, if <br />one simultaneously assesses the <br />L10# L50, and Lego one will find <br />that the value obtained for the <br />Leg falls numerically between the <br />values obtained for the L10 and <br />the L50. In fact, when one <br />assesses additional data coupled with theoretical calculations, <br />