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.
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.
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.
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.