Public Works Project (PWP) Item No. 4355DS

The Government of the Hong Kong Special Administrative Region

Drainage Services Department

Public Consultation Forum

Outlying Islands Sewerage Stage 2

- Lamma Village Sewerage Phase 2

11 June 2011

Agenda

Project Overview

Background

Project Description

Project Schedule

Enquiry and Suggestion

Background

No public sewerage system in Lamma Island at present

Sewage is treated by individual septic tank in general

Nearby rivers and waters at Yung Shue Wan may be polluted and hygiene of the area may be affected by leakage from poorly maintained septic tank

Public sewerage system is proposed to improve the water quality and environmental hygiene condition of Yung Shue Wan

Project Description

The Lamma Village Sewerage Project is conducted in 2 stages

Stage 1

Works commenced in early 2008. The scope of works comprises provision of sewerage system for central part of Yung Shue Wan, Sha Po (part) and Po Wah Yuen (part) ; construction of sewage treatment plant and submarine outfall

Stage 2

The Project, which is currently under detailed design, includes:

Provision of sewerage system for 18 villages and areas

Construction of 3 sewage pumping stations at O Tsai, Tai Wan and Hung Shing Ye

• O Tsai • Tai Peng • Po Wah Yuen (part) • Yung Shue Long New

Village

• Yung Shue Long Old

Village

• Tai Shan West • Tai Shan Central • Tai Shan East

• Tai Yuen Village • Sha Po Old Village (part) • Sha Po New Village (part) • Wang Long

• Yung Shue Wan Back

Street (part)

• Tai Wan Kau Tsuen • Tai Wan San Tsuen • Ko Long (Part)

• Tai Wan To • Hung Shing Ye

Coverage of the Proposed Sewerage System

Legend:

Stage 1 Sewerage Network

Stage 2 Sewerage Network

Stage 2 Sewage Pumping Station

Method of Sewer Laying

Most of the sewers will be laid

in narrow village accesses.

Owing to the site constraints,

open-cut excavation conducted

section by section is proposed

to minimize length of trench

excavation and nuisance to

public.

Traffic Impact Assessment

Suitable traffic mitigation

measures will be implemented

during construction (such as

temporary pedestrian access

and deck-over on the trench

during peak hours)

Sufficient width will be

maintained for vehicular

passage in the main accesses

Minimize the inconvenience

caused to villagers

Temporary pedestrian access

Deck-over on trench

Environmental Impact and

Mitigation Measures

According to the preliminary environmental review, no unacceptable environmental impacts are anticipated during construction and operation after applying suitable mitigation measures

Recommended mitigation measures during construction include:

Use of quiet plant and temporary noise barrier

Dust suppression by regular water spraying

Stockpile of construction materials and wastes will be covered with tarpaulin

Site runoff will be treated and controlled strictly

Quieter equipment

Sewage Pumping Stations (SPS)

Due to topographical constraints, 3 sewage pumping stations have to be built at O Tsai, Tai Wan and Hung Shing Ye

In addition to technical feasibility, the followingfactors have also been considered in site selection: Public nuisance and opinions from residents

Environmental impacts

Maintenance and operation issues

Land resumption

Tai Wan SPS

Hung Shing Ye SPSO Tsai SPS

Environmental Mitigation

Measures for SPS

Adopt activated carbon deodorizers

Use of quieter plant

Provision of silencer

Greenery and enhanced architectural design

Tai Wan SPS

O Tsai SPS

Hung Shing Ye SPS

Figures shown above are photomontage of preliminary layout and are subject to change

Land Requirement

To avoid affecting private land development,

sewerage design will have the following

considerations Minimize resumption of

private land

Avoid bisecting private lot

Sewer to be laid at

unobstructed access as

far as possible

Avoid affecting the

facilities of the village

houses

Sewer alignment to minimize the impact to

private land development

Sewerage Connection by

Property Owner

Public Consultation

First-round public consultation commenced

in October 2008

Notice posting for the proposed SPS sites

Consultation with Lamma Island (North)

Rural Committee

Site visit with Village Representatives and

residents to collect their views

Recent public consultation commenced in

May 2011

Lamma Island (North) Rural Committee

supports the project

Sewerage layout plans have been posted at

Rural Committee and notice board for public

inspection and collecting suggestions

Consultation with Islands District Council will

be held in July 2011

Project Schedule

Major Activities Tentative Programme

Preliminary design Jan 2008 – Aug 2010

Site investigation (survey for

topography, underground utilities,

background noise and built heritage

etc.)

Jul 2008 – Sep 2009

Detailed design Aug 2010 – Jul 2011

Public consultation and design review Oct 2008 – Dec 2011

Gazette of sewerage scheme Aug 2011 – Oct 2011

Commencement of construction Late 2012 / Early 2013

Anticipated completion date 2017

Please feel free to raise any

enquiry or suggestion

Public Works Project (PWP) Item No. 4355DS

Outlying Islands Sewerage Stage 2

- Lamma Village Sewerage Phase 2