Noise mitigation at source
7 Before the commencement of the hearing, the applicant's position was that acoustic treatment should occur on the site. The suggested method was a 2.4m high acoustic barrier and mechanical ventilation provided in rooms in which satisfactory noise levels could not be achieved with the windows open. However, during the hearing the three acoustic experts, Mr B Clarke, for the applicant, Mr A Jochelson, for the council, and Mr S Cooper, for the second respondent, agreed that treatment at the source, ie the Cookson site provided the best solution.
8 Of the measures proposed for the Cookson site, the only visible one would be a wall between 30 m and 100m, depending on the performance of the proposed noise attenuation for various pieces of plant. Based on the information submitted and the maximum length of 100 m, we have considered the visual impact of such a wall to be acceptable. There are no other reasons against mitigation at the source, since mitigation is technically feasible and its cost is reasonable (see Exhibit N) in the context of an 18-dwelling integrated housing development. On the other hand, mitigation within the area of Stage 5A would require some future residents to keep their windows closed and receive unacceptable noise levels outdoors. In our view, this is an unacceptable amenity impact on the future occupants of a new residential development.
9 Given that the expert consensus is consistent with the planning principle we have adopted, we find that the acoustic mitigation measures should be carried out at the Cookson site. The solicitors for Cookson Plibrico Pty Ltd have written to the applicant's solicitors stating that they consent to mitigation works being carried out on their clients' site.