9.0 WATER QUALITY.. 9-1

9.1 Introduction 9-1

9.2 Mitigation Measures. 9-1

8.3 Audit Requirements. 9-1

9.0 WATER QUALITY

9.1 Introduction

9.1.1.1 The water quality impact associated with the construction and operational phases of the Project has been evaluated in the EIA report. No adverse water quality impact is predicted during the construction phase and operational phase. Hence, water quality monitoring is not considered necessary during the construction and operation of the Project.

9.2 Mitigation Measures

Construction Phase

9.2.1.1 In order to address the potential surface runoff during the construction phase of the Project Site, appropriate measures will be implemented in accordance with the guidelines stipulated in Professional Persons Environmental Consultative Committee Practice Note during the construction works to properly control site runoff and drainage and to minimise potential water quality impacts. Major relevant measures are highlighted below:

· All drainage facilities and erosion and sediment control structures shall be regularly inspected and maintained to ensure their proper and efficient operation at all times particularly following rainstorms;

· Precautions to be taken at any time of the year when rainstorms are likely, actions to be taken when a rainstorm is imminent or forecasted and during or after rainstorms, are summarised in Appendix A2 of ProPECC PN 1/94;

· The construction solid waste, debris and rubbish on-site shall be collected, handled and disposed of properly to avoid causing any water quality impacts; and

· Chemical waste shall be handled in accordance with the Code of Practice on the Packaging, Handling and Storage of Chemical Wastes.

Operational Phase

9.2.1.2 The design of the operational phase mitigation measures shall follow Professional Persons Environmental Consultative Committee Practice Note on Drainage Plans (ProPECC PN 5/93), which provides useful non-statutory guidelines for pollution control on different types of discharge to minimise water quality impacts from proposed drainage systems. The design incorporates the potential wastewater generated from the foam system and direct to the appropriate sewerage system.

9.2.1.3 A WPCO effluent discharge licence for discharging of the foam water will be obtained from EPD before commencement of operation, if required. No adverse water quality impact is anticipated during operational phase with the guidelines and measures stipulated in ProPECC PN 5/93 followed. Hence, no further mitigation measure is required.

9.3 Audit Requirements

9.3.1.1 Water quality monitoring is not considered necessary during the construction and operation of the Project.

9.3.1.2 Weekly site inspections shall be carried out by the ET during the construction phase to ensure that the recommended good site practices and other mitigation measures are implemented by the Contractor. Apart from site inspections, documents including wastewater discharge licenses shall be reviewed and audited for the compliance with the legislation and contract requirements.