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This area refers to Rule 8.22 of the plan related to Discretionary Activities within the Operational Area of the Port of Lyttelton, in particular any activity related to the operation of the Port of Lyttelton that is emitting noise at any point within the Operational Area of the Port of Lyttelton, is a Discretionary Activity if the noise generated by that activity exceeds any of the following noise limits within the areas and times stated:\n\n65 dBA Ldn average sound level calculated on an energy basis over any five\nconsecutive days, when measured and assessed at any point on land at, or\nbeyond, the Lyttelton Inner Noise Control Boundary.\n\n68 dBA Ldn day-night average sound level on any day when measured and\nassessed, at any point on land at, or beyond, the Lyttelton Inner Noise Control\nBoundary.\n\n60 dBA Leq (9 hour) time average level over any 9 hour period from 10 p.m. on\nany day to 7 a.m. the next day, when measured and assessed at any point on land at, or beyond, the 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