9.                   Sewerage and sewage treatment

Introduction

9.1               The sewerage performance assessment results in the EIA Report identified surcharged sewers measuring a total length of 1520m with diameters ranging from 225mm to 375mm under the SIA peak flow condition.  Works to improve the surcharged sewers are needed.  It was also proposed to upgrade the existing sewers with pipes of diameters ranging from 225mm to 375mm in order to relieve the identified hydraulic inadequacies and surcharged condition.

Monitoring Requirement

9.2               EM&A requirement associated with sewerage and sewage treatment is not expected.

Recommendation

9.3               Upgrading of the sewers is proposed for the redevelopment project.

9.4               Sewerage improvement works to the existing sewers were recommended to relieve the identified hydraulic inadequacies and surcharged condition.

9.5               The implementation schedule for the recommended sewerage and sewage treatment mitigation measures is presented in Appendix B.