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of this Section, an effective muffler or underwater exhaust <br /> system is one which does not produce sound levels that create <br /> excessive or unusual noise, or sound levels that are in excess of <br /> 90 decibels when subjected to a stationary sound level test as <br /> prescribed by the Society of Automotive Engineers in its <br /> procedure J2005. <br /> B. No person may operate a motorboat so as to exceed a <br /> noise level of 75 decibels measured as specified bv the societv <br /> of Automotive Enqineers in its procedure J1970. <br /> C. This Section does not apply to: (1) A motorboat tunin,g <br /> up for or participating in official trials for a sanctioned race <br /> or reQatta conducted under a permit by the Lake Manager; or (2) a <br /> motorboat beinq operated by a boat or marina engine manufacturer <br /> for the purpose of testina or development, as authorized by the <br /> Lake Manaaer. <br /> D. Anv person violatinq subsections A or B of this Section: <br /> (1) shall be required to install an effective muffler system on <br /> the motorboat in violation: and (2) shall be required to pass the <br /> sound level test prescribed bv the Society of Automotive <br /> Engineers in its procedure J2005 before putting the motorboat <br /> back into use. <br /> E. Any person who operates anv motorboat upon Lake Decatur <br /> shall be deemed to have given consent to the test or tests <br /> prescribed in this Section to determine if the motorboat is in <br /> compliance with the provisions of this Section. <br />