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• Section 816.65 (e) Continued. lessee may sign a waiver relieving the operator from meeting the air- blast limitations of this paragraph. (2) In all cases except the C-weighted, slow-response, the measuring systems used shall have a flat frequency response cf at least 200 Y,z at the upper end. The C-weighted shall be measured with a Type 1 sound level meter that meets the standard American National Standards Institute (ANSI) 51.4-1971 specifications. The P.NSI 51.4-1971 is hereby incorpor- ated by reference as it exists or, the date e' adoption. of this Part. P]otices of changes made to this publication will be aeriodically published by OSN in the Federal Register. ANSI 51.4-1971 is on file and available for inspection at the OSM Central 0`fice, U. S. Department c` the In*,ericr, South Interior &uilding, Washington, D. C. X240, at each OS1.1 kegional Office, District Office, and Field Office and at the central effice of any applicable State regulatory authority. Copies of this publication may also be obtained by writing to the above locatio.^s. A copy of this publication will also be cn file for public ins pecticn at the Federal Register Library, 100 L Stree; N.W., S]ashingtcn, D. C. Incorporation by reference provisions approved by the Director of the Federal Register February 7, 1979. T;;e Director's a?prova_ .._ this ~..corp ration by reference expires en February 7, 1980. (3) The person who conducts blasting may satisfy the provisions of t:~is Section by meeting any of the tour specifications in the chart in para- graph (e)(1) o: this Section. (4) The regulatory authority may require an airblast measurement of any or all blasts, and may specify the location of such measurements. Energy Fuels will control airblast from its blasting operations within the permit area so it does not exceed the values specified by the chart set forth in 30 CFR 816.65 (e)(1) at any dwelling, • public building, school, church or commercial or institutional 816-79