(A) The sound pressure level generated by a utility grid wind energy system shall not exceed 55 Db(A) measured at the property lines between leased and non-leased property. This sound pressure level shall not be exceeded for more than three minutes in any hour of the day. If the ambient sound pressure level exceeds 55 Db(A), the standard shall be ambient Db(A) plus five Db(A).
(B) As part of the application and prior to installation, the applicant shall provide modeling and analysis that will confirm that the utility grade wind energy system will not exceed the maximum permitted sound pressure levels. Modeling and analysis shall conform to IEC 61400 and ISO 9613.
(C) After installation of the utility grade wind energy system, sound pressure level measurements shall be done by a third party, qualified professional according to the procedures in the most current version of ANSI S12.18. All sound pressure levels shall be measured with a sound meter that meets or exceeds the most current version of ANSI S1.4 specification for a Type II sound meter. Documentation of the sound pressure level measurements shall be provided to the local government within 60 days of the commercial operation of the project.
(Ord. passed 5-13-2009)