1                                            Introduction

1.1                                      Background to the Study

Hongkong Electric Company Ltd (HEC) has initiated a project to retrofit its two existing 350MW coal-fired generating Units L4 and L5 on Lamma Power Station with Flue Gas Desulphurization (FGD) plant for reducing sulphur dioxide emission in support of Government policy objective to improve the air quality of the Pearl River Delta.

Two above ground oil storage tanks (No. 4 and No. 5 Light Oil Tanks) with associated pipelines and an oil separation sump are proposed to be demolished to provide space for installation of the FGD plants.  In accordance with the requirement of Environmental Impact Assessment Study Brief (No. ESB-133/2005) issued by the Environmental Protection Department (EPD) to the retrofit project and as a part of environmental impact assessment (EIA) requirement, a land contamination assessment was proposed at the  locations of the No.4 and No. 5 Light Oil Tanks and the oil separation sump (the Site).

ERM Hong Kong Limited was commissioned by HEC to conduct the land contamination assessment of the Site for the project.  A Contamination Assessment Plan (CAP) was prepared by ERM and was approved by EPD in November 2005.

An intrusive soil and groundwater contamination investigation was conducted by ERM from November 14 to 19, 2005.  The field investigation was performed in accordance with the procedures and requirement set out in the CAP.

A Contamination Assessment Report (CAR) summarising the results of the SI and recommending delineation investigation and remediation actions to be carried out at the Site was prepared by ERM, and was submitted to EPD in December 2005.

1.2                                      Objectives of the Action Plan

This Remediation Action Plan (RAP) presents the results obtained during the contamination delineation investigation at the site and proposes remediation actions accordingly.  The objective of the plan is to recommend remediation actions in these areas so as to reduce the opportunity for exposure to land contamination risks by current/future occupants of the Site.

1.3                                      Scope of the Remediation

The scope of the remediation will include:

·       Demolition of the No.4 and No. 5 light oil tanks and the oil separation sump and excavate soil materials to facilitate construction of the FGD plant as necessary;

·       Conducting confirmation and verification sampling underneath and around the demolition area parcel;

·       Sampling, testing, treatment and handling/management of the contaminated soils excavated; and

·       Preparation of a decontamination verification report upon completion of the demolition, construction and decontamination works.

1.4                                      Structure of the RAP

The remainder of this report is structured as follows:

Section 2          summarises the site investigation results; and

Section 3          presents contamination remediation action plan for No.4 and No. 5 light oil tanks and the oil separation sump.

The report is accompanied by the following set of annexes:

Annex A          presents the CAR; and

Annex B          presents selected photographs of the Site area.