ilembe district municipality - sahris

ILEMBE DISTRICT MUNICIPALITY

ILembe House, 59/61 Mahatma Ghandi Road, KwaDukuza, South Africa, 4450

12 Haysom Road, Ilembe District Municipality, KwaDukuza, South Africa, 4450

Tel: +27 (0)32 551 8776

Cell:+27(0)83 950 0770

[email protected]

www.ilembe.gov.za

LOWER THUKELA BULK WATER

SUPPLY SCHEME OFFTAKES 7 & 8

CONSTRUCTION METHOD

STATEMENT

|Office 1B Deodant Building |10 Payne Street, Pinetown, 3600 |

|Tel: (031) 701 1038 | Fax: (031) 701 0963|

|E-mail : [email protected] | Website : www.vumesa.co.za|

DESIGN REPORT

Project No. TBC “LOWER THUKELA BULK WATER SUPPLY SCHEME OFFTAKES 7 & 8

Page 1 of 8

Prepared by

VUMESA (PTY) LTD

Office 1B Deodant Building,10 Payne Street Pinetown, 3600

Prepared for

ILEMBE DISTRICT MUNICIPALITY

12 Haysom Road, Ilembe District Municipality,

KwaDukuza, South Africa, 4450

Issue/revision Issue 1 Revision

Remarks CONSTRUCTION METHODOLOGY

Date 09 OCTOBER 2017

Prepared by SENZIWE MNGADI

Contact 031 701 1038

Signature

Date

Checked by SABELO XHAKAZA

Signature

Date

Authorised by MELUSI NDLOVU

Signature

Date

Project number

File reference LOWER THUKELA BULK WATER SUPPLY SCHEME

OFFTAKES 7 & 8

DESIGN REPORT


Page 2 of 8

EXECUTIVE SUMMARY

A reliable supply of clean and safe water is the first and most critical municipal service that people require, Ilembe

District Municipality.

The success in land acquisition from privately owned properties will assist in the success of the project.

The projects has been divided into three projects as follows:

Project 1: Construction of Offtake 7 which consist of (450mmØ pipeline and 5Ml concrete reservoir)

Project 2: Construction of Offtake 8e, 2 Ml concrete reservoir and Pump station ( Offtake 8f (350mmØ)

Project 3 : Construction of Offtake 8f and 9 ( Offtake 8f 350mmØ and 250mmØ and offtake 9 350mmØ)

The total cost for the project is R 129 336 202.46

DESIGN REPORT


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ABBREVIATIONS

IDM : Ilembe District Municipality

LTBWSS : Lower Thukela Bulk Water Supply Scheme

NCSS : North Coast Supply System

DWS : Department of Water and Sanitation

EPWP : Expanded Public Work Programme

DWS : Department of Water & Sanitation

CLO : Community Liaison Officer

COGTA : Department of Corporate Governance & Traditional Affairs

DOT : Department of Transport

DOE : Department of Energy

DOH : Department of Health

DPW : Department t of Public Works

SANRAL : South African National Roads Agency Limited

WSA : Water Services Authority

WSP : Water Services Provider

MIG : Municipal Infrastructure Grant

RBIG : Regional Bulk Infrastructure Grant

SCM : Supply Chain Management

SLA : Service Level Agreement

IDP : Integrated Development Plan

WSDP : Water Services Development Plan

WULA : Water Utilisation Licence Application

ROD : Record of Decision

EMP : Environmental Management Plan

EIA : Environmental Impact Assessment

PMU : Project Management Unit

ISD : Institutional Social Development

MHS : Manager Health & Safety

Pr Tech Eng : Professional Technologist: Engineering

Pr Eng : Professional Engineer

SG : Surveyor General

PSC : Project Steering Committee

OHS : Occupational Health & Safety

O&M : Operations & Maintenance

Vumesa : Vumesa (Pty) Ltd

DESIGN REPORT


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Table of Contents EXECUTIVE SUMMARY .............................................................................................................................................. 2

ABBREVIATIONS .......................................................................................................................................................... 3

1. Introduction ........................................................................................................................................................... 5

2. Planning of Pipelines ........................................................................................................................................... 5

3. Planning of River/Stream and Wetland Crossings ...................................................................................... 7

4. Construction Methodology ................................................................................................................................ 7

5. Conclusion .............................................................................................................................................................. 8

DESIGN REPORT


Page 5 of 8

1. Introduction

This report note covers the generic design and construction considerations and parameters for

project Lower Thukela Bulk Water Supply Scheme Offtakes 7 & 8. The project consist

construction of:

New 450mm Diamater Class 12 to 16 oPVC 3.1km Long Gravity Main Pipeline (Offtake

7).

New 250mm Diameter Class 12 to 16 uPVC 2.2km Long Bulk Portable Water Gravity

Pipeline to New Guilderland.

New Bulk Portable Water Storage, 5ML Steel Reinforced 35Mpa Concrete Reservoir in

Blythdale West

New 350mm Diamater Class 12 to 16 uPVC 4km Long Gravity Main Pipeline

(Offtake 8e). New Bulk Portable Water Storage, 2ML Steel Reinforced 35Mpa Concrete Reservoir in

Groutville, Ethembeni

15ML Brick and Reinforced Concrete Pump Station at the existing 2 and 2.5ML (4,5ML)

UMvoti Balancing Reservoirs

New 300mm Diamater Class 12 to 16 uPVC 1.5km Long Gravity Main Pipeline (Offtake

8f).


8f)


9)

All pipes will be laid, as far as is possible, in the existing pipeline servitudes, road reserves and

also in privately owned land where omnibus servitudes have been provided and on property

boundaries.

Pipelines will be laid in trenches and backfilled to natural ground level except in the stream

crossing. The overall layout is as shown in Annexure A.

2. Planning of Pipelines

In the planning for the design phase of the pipelines, cognisance was taken of the following

reference documents;

I. Red Book – Guidelines for Human Settlement Planning and Design;

II. SABS 1200 – Standardised Specification for Civil Engineering Construction;

III. Ilembe District Municipality standards.

When planning or designing the pipelines, a holistic approach that adheres to all the tenets of

the reference or policy documents listed above was adopted. The environmental sensitivity of

wetland and sensitive areas was acknowledged, and designs took full cognisance of the proposed

impact to these areas.

DESIGN REPORT


Page 6 of 8

The approach to design and construction will encompass the following;

Appropriate and adequate protection of existing manmade and natural structures such

as buildings, fences, river banks, etc. in the vicinity of the pipelines will be incorporated

into the design.

Existing fences will be maintained as far as is possible, but if not possible will be

temporarily removed and reinstated to the same or better condition. The time taken

will be kept to a minimum and where necessary temporary fencing will be erected to

maintain the level of security to the effected properties.

Where crossing or running alongside river or stream courses, the existing river/stream

bank structure will be maintained to reduce disturbance to the river flow.

Where the pipeline crosses stormwater channels it has been designed to have no

impact on normal stormwater flow in that all pipes and concrete casing will be buried

at least 500mm below natural channel level in the case of soft material, and level with

reno- mattress in the case of hard rock material.

In the case of sewer and stormwater pipelines, manholes will be provided at all

changes in grade and direction and at intervals not exceeding 80m to facilitate

maintenance during the lifetime of the pipelines.

DESIGN REPORT


Page 7 of 8

3. Planning of River/Stream and Wetland Crossings

In the planning for the design phase of the pipe crossing, cognisance is taken of the

following reference documents;

Red Book – Guidelines for Human Settlement Planning and Design;

SABS 1200 – Standardised Specification for Civil Engineering Construction;

Local municipal standards.

When planning or designing the pipe crossing, a holistic approach that adheres to all the

tenets of the reference or policy documents listed above will be adopted. The

environmental sensitivity of wetland areas is acknowledged and designs undertaken will

take full cognisance of the proposed impact to these areas.

This includes the impact on all, or any, matters relating to water quality, flooding,

agricultural drainage, erosion, flora and fauna and any adjacent topographical features.

The approach to design and construction will encompass the following;

Appropriate and adequate protection of the river/stream/wetland banks in the

vicinity of the pipeline will be incorporated into the design.

The existing river/stream bank structure will be maintained to reduce disturbance

to the river/stream flow.

Wherever possible, the pipelines will cross river/stream and wetlands within a

road prism.

The pipe crossings have been designed to have no impact on normal river/stream

flow.

Where pipes are laid through a flood plain (1 : 100 year flood line), a minimum

cover level of 1 metre will be maintained.

4. Construction Methodology

Construction methodology will differ slightly depending on the nature of the river/stream

or wetland being crossed. Perennial streams will require the temporary diversion of water

flow during construction, whereas non-perennial streams may not require flow diversion

depending on the season.

4.1 A typical construction sequence is summarised hereunder:

Conduct a competent site investigation to build up an informed picture of the

task.

Conduct a topographical survey of the pipeline route.

Adequate design of all the stages of construction.

All Environmental and Health and Safety requirements and good practice to be

adhered to.

DESIGN REPORT


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4.2 Plant and Resources required for the Construction may include, inter alia:

Excavators;

Crane of sufficient lifting capacity and reach for pipe laying (if required);

Tipper trucks for the delivery of bedding material;

Compaction equipment;

Pneumatic breakers (if required);

On-site concrete batching plant (if required);

Concrete delivery vehicles for wet concrete;

Formwork, reinforcing steel and the necessary equipment and tools for assembly;

Equipment for the construction of concrete ring manholes and concrete

encasement of pipes.

4.3 Construction Method for Pipes laid in Trenches:

This method will be used where pipes are conventionally laid in trenches and backfilled to

natural ground level.

Remove topsoil and stockpile for later use.

Excavate trench for pipeline to the design level.

If the material is firm normal excavation techniques will apply. In soft material

shoring of the trench sides may be required. In hard rock material trench

excavation may require the use of pneumatic breakers or blasting.

Install temporary dewatering pumps to keep the excavation dry (if required due

to groundwater ingress).

Construct stormwater diversion berms where required.

Place concrete to encasement if required. The top level will be determined by the

stormwater channel level.

Place bedding, lay pipe, place and compact selected fill over the pipeline.

Construct manholes, where required. Manholes will be constructed along the

pipeline route at changes in grade and direction.

Backfill to specification.

Dress backfill, topsoil and re-vegetate all exposed areas.

5. 5. Conclusion All design and construction work will be carried out in accordance with the relevant

construction

specifications and in compliance with the Construction Health and Safety Specifications as

well as

the Construction Environmental Management Plan. Internal surface joints in the floor and

wall are to be sealed using the bandage system Roof joints (top and sides) are to be sealed

using self-adhesive aluminium foil strips and ferrule holes sealed with an approved latex

compound).

ilembe district municipality - sahris

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