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Conclusion <br />OW <br />Potential effects: <br />m Sleep disturbance <br />Mitigated by hours of use (7am-7pm) <br />Conservative estimate of 15 dB noise level reduction from <br />outside to inside <br />Less than 10% of population are awakened by an 80 dB <br />disturbance <br />Indoor speech interruption. <br />Less than 5 minutes per event <br />Helicopters do not make constant sound (Lmax is loudest <br />recorded dB) <br />Similar or less interruption than speaking in a restaurant <br />