Lusaka Water Supply, Sanitation and Drainage … · Detailed Engineering Design, Tender Documents, Detailed ESIAs and ESMPs for Water Supply and ... Water Reticulation in Ndeke, Kwamwena,

THE REPUBLIC OF ZAMBIA

MINISTRY OF LOCAL GOVERNMENT AND HOUSING

LUSAKA WATER AND SEWERAGE COMPANY

In Financial Cooperation

with

Lusaka Water Supply, Sanitation and Drainage (LWSSD) Project Detailed Engineering Design, Tender Documents, Detailed ESIAs and ESMPs for Water Supply and Sanitation Projects

CONSTRUCTABILITY REPORT

November 2012

9 November 2012

USACE Europe District

ATTN: Wayne Uhl

Konrad-Adenauer Ring 39

65187 Wiesbaden, Germany

Millennium Challenge Corporation

ATTN: Gail Chambers

875 Fifteenth St. NW

Washington, DC 20005-2221

Re: Lusaka Water Supply, Sanitation and Drainage (LWSSD) Project

Detailed Engineering Design, Tender Documents, Detailed ESIAs and ESMPs for

Water Supply and Sanitation Projects

Constructability Report

Dear Mr Uhl and Ms Chambers

We are pleased to submit the above referenced report under Task Order W912GB-12-D-0019-

0006. This report details the interactions between the selected water supply and sanitation sub-

projects, the constructability issues and the construction schedules as per the scope of the Task

Order.

Please do not hesitate to contact us if any clarifications or additional information are required.

Yours faithfully

Stefan Dörner

Program Manager

Lusaka Water Supply, Sanitation and Drainage (LWSSD) Project

Detailed Engineering Design, Tender Documents, Detailed ESIAs and

ESMPs for Water Supply and Sanitation Projects


Gauff Ingenieure Page I

LUSAKA WATER SUPPLY, SANITATION

AND DRAINAGE (LWSSD) PROJECT

DETAILED ENGINEERING DESIGN, TENDER DOCUMENTS,

DETAILED ESIAS AND ESMPS FOR WATER SUPPLY AND

SANITATION PROJECTS

CONSTRUCTABILITY REPORT

Table of Contents

1. BACKGROUND ................................................................................................................................. 1-1

1.1 Scope of this Report .......................................................................................................................... 1-1

1.2 Aims and Objectives of the Constructability Report .......................................................................... 1-1

1.3 Organisation of the Report ................................................................................................................. 1-2

2. DESCRIPTION OF THE WORKS ..................................................................................................... 2-1

2.1 LP1 – Rehabilitation of Iolanda Treatment Works, Transmission and Distribution Centres .............. 2-1

2.2 LP6 – Primary Distribution Backbone Strengthening ........................................................................ 2-8

2.3 LS2 – Network Expansion in Central Branch .................................................................................. 2-10

2.4 LS3 – Network Expansion in Chelston Branch ................................................................................ 2-12

2.5 CSU15 – Chelston Pump Station Upgrade and Replacement ........................................................ 2-14

2.6 CSE44 – Sewer Expansion in Mtendere ......................................................................................... 2-16

2.7 CSU4 – Kaunda Square Interceptor Upgrade ................................................................................. 2-17

2.8 TU5 & TE3 – Kaunda Square Treatment Ponds Upgrade and Expansion ..................................... 2-19

2.9 Tabular Summary of Works Components........................................................................................ 2-21

2.10 Summary of Value of Components .................................................................................................. 2-22

2.11 Summary of Works Geographic Location ........................................................................................ 2-22

3. RECOMMENDED PACKAGING OF CONSTRUCTION CONTRACTS ......................................... 3-24

3.1 Packaging Rationale ........................................................................................................................ 3-24

3.2 Contract Package 1 – CP1, Rehabilitation of Iolanda Treatment Works, Transmission and Distribution Centres ......................................................................................................................... 3-24

3.3 Contract Package 2 – CP2, Primary Distribution Backbone Strengthening .................................... 3-24

3.4 Contract Package 3 – CP3, Water and Sewer Reticulation in the Kamanga, Mtendere, Kaunda Square and Chelston Areas ............................................................................................................. 3-25

3.5 Contract Package 4 – CP4, Kaunda Square Waste Stabilisation Ponds ........................................ 3-25

3.6 Contract Package 5 – CP5, Water Reticulation in Ndeke, Kwamwena, SOS Village, Chipata and Ng’ombe ........................................................................................................................................... 3-25

3.7 Overview of Contract Packages ...................................................................................................... 3-26





Gauff Ingenieure Page II

4. SUMMARY OF CONSTRUCTABILITY CHECKLISTS .................................................................... 4-1

5. PROJECT CONSTRUCTION SCHEDULE ....................................................................................... 5-1

5.1 Contract Package 1 – CP1, Rehabilitation of Iolanda Treatment Works, Transmission and Distribution Centres ........................................................................................................................... 5-1

5.2 Contract Package 2 – CP2, Primary Distribution Backbone Strengthening ...................................... 5-1

5.3 Contract Package 3 – CP3, Water and Sewer Reticulation in the Kamanga, Mtendere, Kaunda Square and Chelston Areas ............................................................................................................... 5-2

5.4 Contract Package 4 – CP4, Kaunda Square Waste Stabilisation Ponds .......................................... 5-2

5.5 Contract Package 5 – CP5, Water Reticulation in Ndeke, Kwamwena, SOS Village, Chipata and Ng’ombe ............................................................................................................................................. 5-3

Index of Tables

Table 2-1: Summary of Works Components in Sub-projects ....................................................................... 2-21

Table 2-2: Value Bracket Cost Ranges ........................................................................................................ 2-22

Table 2-3: Value Brackets of Sub-projects ................................................................................................... 2-23

Table 4-1: Constructability Checklist Summary Table .................................................................................... 4-1

Index of Figures

Figure 2-1: Location map of project intervention – LP1 .................................................................................. 2-2

Figure 2-2: Location map of project intervention – LP6 .................................................................................. 2-9

Figure 2-3: Location map of project intervention – LS2 ................................................................................ 2-11

Figure 2-4: Location map of project intervention – LS3 ................................................................................ 2-13

Figure 2-5: Location map of project intervention – CSU15 .......................................................................... 2-15

Figure 2-6: Location map of project intervention – CSE44 ........................................................................... 2-17

Figure 2-7: Location map of project intervention – CSU4 ............................................................................ 2-18

Figure 2-8: Location map of project intervention – TU5 & TE3 .................................................................... 2-20

Figure 2-9: Location map of all project interventions .................................................................................... 2-22

Figure 3-1: Location map of Contract Packages .......................................................................................... 3-26

Annexes

Annex I – Constructability Checklists

Annex II – Work Programmes





Gauff Ingenieure Page III

List of Acronyms and Abbreviations

AE Architect-Engineer (the Consultant: HP Gauff Ingenieure GmbH)

DC Distribution Centre

DI Ductile Iron

DN Nominal Diameter

ESIA Environmental and Social Impact Assessment

ESMP Environmental and Social Management Plans

FIDIC Federation of Consulting Engineers

FS Feasibility Study

GRZ Government of the Republic of Zambia

HDPE High Density Polyethylene

HL High Lift (pumps)

LV Low Voltage

LWSC Lusaka Water and Sewerage Company Limited

LWSSD Lusaka Water Supply, Sanitation and Drainage

LWW Lusaka Water Works

MCA-Z Millennium Challenge Account-Zambia

MCC Millennium Challenge Corporation

OD Outside Diameter

O&M Operations and Maintenance

PCB Polychlorinated Biphenyl

PF Power Factor

PS Pump Station

pH Power of Hydrogen

QM Quality Management

RTU Radio Transmission Unit

SCADA Supervisory Control and Data Acquisition

uPVC unplasticised Polyvinylchloride

USACE United States Army Corps of Engineers

USD United States Dollar

ZAF Zambian Air Force

ZESCO Zambia Electricity Supply Corporation





Gauff Ingenieure 1-1

1. BACKGROUND

The Government of the Republic of Zambia (GRZ) has identified access to clean and safe

water supply and adequate sanitation, drainage system and solid waste management in the

Capital City of Lusaka as key priorities and have worked with the Millennium Challenge

Corporation (MCC) to develop priority projects to be funded by MCC. The priority sub-

projects were identified in the “Investment Master Plans” for water supply, sanitation and

drainage financed by the MCC.

MCC and GRZ have agreed and signed a Compact program that focuses on the

improvement of water supply and sanitation infrastructure to enable the access to clean

and safe water supply and adequate sanitation services in the Capital City of Lusaka.

The Lusaka Water Supply, Sanitation and Drainage (LWSSD) project covers the

engineering design and tender documentation to source contracts for various sub-projects.

1.1 Scope of this Report

The scope of this report, as required by the Statement of work, is as follows:

The AE shall prepare and submit a Constructability Report that includes the following

elements:

Packaging of Construction Tender Documents

The AE shall investigate and report the potential to combine or split sub-projects into

manageable tender packages to achieve the following goals:

Minimize impacts to the local population to the extent possible, including minimizing

disruptions to existing utility services, combining water and sewer projects in

concurrent locations so that road excavation only occurs once; and,

Completion of all construction projects within the Compact timeline.

Sub-projects shall be split or combined into manageable tender sizes that maximize

competition to get the best value for LWSC and to allow for multiple parallel projects,

focusing each contractor’s efforts on a particular geography. An example of projects that

may be combined include LS1 (installation of bulk and consumer water meters) with LP6

(strengthening of the primary distribution system), the combination potentially split into

multiple contracts or lots that are geographically based.

Mitigation Strategy for Difficult Construction Conditions

AE shall identify strategies to develop specific language for consideration and inclusion in

the tender documents to protect MCC and MCA-Zambia from cost escalation and

construction overruns due to rainy season construction and drainage, flooding, high water

at the intakes, and unsuitable conditions in the project areas. The tender document shall

include a section on rock construction and blasting methodology or specialized equipment.

1.2 Aims and Objectives of the Constructability Report

The aims of the constructability review process are to:

1. Enhance Early Planning

2. Minimize Scope Changes






3. Reduce Design Related Change Orders

4. Improve Contractors Productivity

5. Develop Construction-Friendly Specifications

6. Enhance Quality

7. Reduce Delays/Meet Schedules

8. Improve Public Image

9. Promote Construction Safety

10. Reduce Conflicts/Disputes

11. Decrease Construction/Maintenance Costs

The constructability review process should assure that:

The project, as detailed in the plans and specifications, can be constructed using

standard construction methods, materials and techniques.

The plans and specifications provide the contractor with clear, concise information

that can be utilized to prepare a competitive, cost-effective bid.

The work when constructed in accordance with the plans and specifications will

result in a project that can be maintained in a cost-effective manner by LWSC over

the life of the project.

The constructability report does not cover the LS1 sub-project.






1.3 Organisation of the Report

Detailed constructability checklists have been prepared for each sub-project and these

include the following aspects; general, earthworks, pipelaying, structures, mechanical,

electrical, buildings, traffic accommodation, shutdowns, resettlement, environmental and

health & safety.

The checklists are included in Annex I, whilst Annex II contains the construction

programmes for the proposed contract packages.

This chapter introduces the broad project - its background and objectives.

Chapter 1: Introduction

This chapter describes the works contained in the various design packages that form part of the scope of works for the current assignment. The purpose is to summarise the works included in each so that similarities in works and geographical location can be easily identified.

Chapter 2: Description of the Works

This chapter uses the information in Chapter 2 to make recommendations for merging and breaking up the works contained in the various design packages into logical construction contract packages.

Chapter 3: Recommended packaging of Construction Contracts

This Chapter contains the constructability review of each of the design package. This is a checklist based review with summary tables of the major issues affecting each component of the project.

Chapter 4: Summary of Constructability Checklists

This chapter gathers the information on construction packaging and constructability issues and utilises it to recommend contract time scales for each construction package. Constraints on scheduling for each package are highlighted and a construction programme of work is presented for each contract package.

Chapter 5: Project Construction Schedule






2. DESCRIPTION OF THE WORKS

2.1 LP1 – Rehabilitation of Iolanda Treatment Works, Transmission and Distribution

Centres

Under LP1, works were identified to accomplish the following objectives:

the rehabilitation of existing infrastructure, including civil works, electrical &

mechanical works and improvement of the water treatment process to reinstate the

design capacity to 110,000 m3/d from the present capacity of about 98,000 m3/d,

replacement of faulty pipe fittings along the transmission mains as well as within the

treatment plant and the distribution centres.

In order to achieve the above objectives, the following works are proposed:

Intake works at Kafue River: Physical inspections including levels on the roof and an

underwater camera examination showed that there was no settlement of the

structure. The electrical and mechanical work included an inspection of the

penstock gates, trash screens and four vertical turbine raw water pumps, which had

been installed under another contract in 2010 – 2011. These pumps were found to

be operating at their maximum current. Part of this high current is due to the

substantial voltage drop on the overhead aluminium power supply line. The actual

flow rates of these pumps were found to be less than the design capacity. Remedial

measures have been proposed including the replacement of the supply line. Other

works include the replacement of the trash screens and their retrieving system.

Iolanda water treatment plant and high lift (HL) pumps: the water treatment system

consists of coagulation flocculation, up-ward flow sedimentation and rapid gravity

filtration. Backwash of the filters is accomplished with air scour blowers and

backwash pumps. The sedimentation tanks have serious leakages from the

expansion joints. Such leakages were also found in the suction chamber of the high

lift pumps and in the treated water tanks. Remedial measures for these leakages

have been proposed. The backwash system has several leakages and the control

butterfly valves are worn out. This system will be rehabilitated by replacement of the

worn out components. The chemical dosing systems for flocculation with alum and

pH correction with lime are both in a dilapidated condition. These systems will be

rehabilitated. Disinfection is carried out by gaseous chlorine. Works have been

proposed to improve this system including safety aspects. The HL pumps were

found to be structurally sound and their performance was found to be at par with the

performance curves of these pumps. Their rehabilitation is therefore the

recommended option. While the Local Control Panel is in a sound condition, the MV

Switchboard and MCC are in a “fair wear and tear” condition. Spare parts are

getting more difficult to obtain for this switchboard and it is recommended that it be

replaced.

Chilanga Booster Station: this booster station is identical in almost all aspects to the

HL pump station at Iolanda. Therefore, similar corrective measures are

recommended for this facility.






Foreign procurement - steel (or DI) pipes, fittings, pumps, switchgear

Local procurement - cement, aggregate, reinforcement

c. Preliminary Works

None

d. Temporary Works

None

e. Civil

None

f. Structural

Repair cracks and seal joints in various concrete structures

Remove loose bitumen/material, apply water proofing and provide a layer of

light aggregate on roofs of intake and reservoirs

Repair and construct new valve chambers on raw and treated water mains

g. Mechanical

Replace/ repair fittings on raw and treated water mains

Kafue Intake:

o The replacement of the intake trash screens and lifting mechanism

o Installation of ultra-sonic river water level gauge

o Installation of de-sludge submersible pumps (2 No.)

o Service of the penstock gates

Iolanda Water Treatment Plant

o Sedimentation Tanks

o Replacement of flash mixers (2 No.)

o Replacement of sludge cones and lifting equipment

o Replacement of decanting troughs

o Chemical Dosing

o Reinstatement of alum and lime dosing system

o Improvement of small power and lighting

o Improvement of chlorine dosing system

o Filters

o Rehabilitation of backwash pumps and appurtenances

o Replacement of air scour blowers (2 No.)

o Rehabilitation of backwash pipeline and system

o Replacement of filter backwash launders and siphons

o Replacement of filter drain penstock gates






o High Lift Pumps

o Rehabilitation of Ebara pumps (4 No.)

o Replacement of appurtenances including cone valves

Chilanga Booster Station

o Rehabilitation of Ebara pumps (4 No.)

o Replacement of appurtenances including cone valves

Stuart Park DC Booster Station (West and East)

o Rehabilitation of Booster Pumps (4 No.)

o Replacement of appurtenances

o Replacement of flow meter


Chelston DC Booster Station



o Replacement of flow meters


7C DC Booster Station




Mass Media DC Booster Station

o Replacement of pumps (3 No.)




High Court DC Booster Station

o Rehabilitation of pumps (4 No.)



Woodlands DC Booster Station

o Rehabilitation of pumps (3 No.)



Lumumba DC Booster Station

o Replacement of old Pumps (2 No.)









Chawama DC Booster Station

o Replacement of old Pump (1 No.)

o Rehabilitation of Pump (1 No.)




Lusaka WW Plant 01

o Replacement of old Pumps (3 No.) to High Court

o Rehabilitation of Pumps (3 No.) to Woodlands




Lusaka WW Plant 02

o Replacement of old Pumps (2 No.)


h. Electrical

Kafue Intake:

o Replacement of the LV transformer (100 kVA)

o Replacement of overhead power line

o Replacement of underground power cable


o Installation of logic energy meter

o Installation of PF improvement capacitors

o Installation of sensors and transmitters for SCADA

Iolanda Water Treatment Plant

o Sedimentation Tanks

o Rehabilitation of the flash mixer LV Switchboard and MCC


o Chemical Dosing


o Rehabilitation of the Alum LV Switchboard and MCC

o Rehabilitation of the Lime LV Switchboard and MCC






o Filters

o Rehabilitation of the Lime LV Switchboard and MCC


o High Lift Pumps

o Replacement of Sub-main Switchboard and MCC

o Rehabilitation of the Local Control Panel




o Service of transformers

Chilanga Booster Station

o Replacement of Sub-main Switchboard and MCC

o Rehabilitation of the Local Control Panel




Stuart Park DC Booster Station (West and East)

o Replacement of Sub-main Incomer Switchboards (2 No.)

o Rehabilitation of LV Switchboard and MCC





Chelston DC Booster Station

o Replacement of LV Switchboard and MCC





7C DC Booster Station

o Replacement of LV Switchboard and MCC

o Replacement of cables










Mass Media DC Booster Station






High Court DC Booster Station






Woodlands DC Booster Station






Lumumba DC Booster Station





Chawama DC Booster Station






Lusaka WW Plant 01











Lusaka WW Plant 02

o Replacement of LV Switchboard and MCC (for 2 pumps)

o Installation of cables





i. Building Works

Repair/ paint existing buildings at Kafue intake, Iolanda treatment plant and

DCs in Lusaka

j. Miscellaneous Works

Repair access roads and fences

Description of Specialist Components

Supply/ rehabilitation and installation of Iolanda and Chilanga high lift pumps

Safe removal and environmental disposal of PCBs from old transformers

2.2 LP6 – Primary Distribution Backbone Strengthening

The key component of this sub-project is the strengthening of the primary (backbone)

distribution system in order to efficiently transfer water received from Iolanda Treatment

works to the distribution centres within Lusaka City.

Approximately 20 km of DN 1200, DN 900 and DN 700 will be required for strengthening of

the existing primary distribution network. The planned works under LP6 include the

following new transfer pipelines:

Section 1: Laying a parallel DN 1200 line to the existing DN 900 between junction to

Lusaka Water Works (LWW) off the existing transmission main from Kafue and

Stuart Park, length 4,000 m.

Section 2: Laying a parallel DN 900 line to the existing DN 600 from Stuart Park

along Kamloops road and terminating at the roundabout on the Great East Road,

length 5,300 m.

Section 3: Laying a parallel DN 900 line to the existing DN 600 between junction to

LWW off the existing transmission main from Kafue and Lumumba reservoirs,

length 7,520 m.

Section 4: Laying a parallel DN 700 line to the existing DN 450 line along Mumbwa

road running from the roadside boreholes to Lumumba reservoir, length 3,010 m

(the existing line has numerous connections and will be used as a service line).






Implementation of the above measures will not only ensure efficient transfer of water within

the network but also ensure sufficiency in the primary distribution backbone especially once

more supply is availed to Lusaka from Kafue to meet the full 2015 demands.

Figure 2-2: Location map of project intervention – LP6

Description of Major Works Components

a. Pre-Contract Activities

Resettlement and compensation activities in locations where residents

encroached into the road wayleaves

b. Procurement Activities

Foreign procurement - steel (or DI) pipes, fittings

Local procurement - cement, aggregate, reinforcement

c. Preliminary Works

Confirm exact locations of existing underground services

d. Temporary Works

None

e. Civil

Pipelaying in steel (or DI) pipes with diameters DN 700 to DN 1200 (20 km)

Reinstatement of paved roads

f. Structural

Construction of reinforced concrete valve and washout chambers (precast

elements and in-situ)






g. Mechanical

Installation of isolation valves and air valves

h. Electrical

None

i. Building Works

Reconstruction of boundary walls, fences damaged by construction activities

j. Miscellaneous Works

None


In-situ welding of steel pipes

Pipe crossing by “pipe jacking” under the Kafue Road, the ZAF runway and three railway

crossings

2.3 LS2 – Network Expansion in Central Branch

The objective of the LS2 sub-project is to increase water coverage in the Central Branch

area of Lusaka, and improve water supply in Ng’ombe, SOS East and Chipata. Under LS2

the following is proposed:

Extension of secondary and tertiary networks into Central branch DMAs specifically

to Ng’ombe, SOS East and Chipata.

Supply and installation of consumer connections & water meters.

Construction of water kiosks.

Water expansion in the Ng’ombe (New Ng,ombe), SOS East and Chipata (North and

South) areas will consist of approximately 58 km of new pipelines varying in diameter from

OD 63 to OD 315.






Installation of water meters

g. Electrical

None

h. Building Works

Construction of water kiosks

Reconstruction of boundary walls, fences damaged by construction activities

i. Miscellaneous Works

None


None

Geographical Location of Works

The New Ng’ombe, SOS East and Chipata (North and South) areas are located in the north

of Lusaka and can be accessed from the Great North Road and Great East Road

(Ng’ombe).

2.4 LS3 – Network Expansion in Chelston Branch

The objective of the LS3 sub-project is to increase water coverage in the Chelston branch

area of LWSC, and improve water supply in Mtendere, Kamanga, Kwamwena and Ndeke–

Vorna Valley. Under LS3 the following works are proposed:

Extension of Secondary and Tertiary Networks into Chelston branch DMAs

specifically Mtendere, Kamanga, Kwamwena and Ndeke-Vorna Valley

Supply and installation of consumer connections & water meters

Construction of kiosks

Drilling and equipping of boreholes (8 No. in Ndeke and 4 No. in Kwamwena)

Construction of one 750 m3 elevated and one 800 m3 ground reinforced concrete

reservoirs

Water expansion in the Mtendere, Kamanga, Kwamwena and Ndeke-Vorna Valley areas

will consist of approximately 280 km of new pipelines varying in diameter from OD 63 to

DN 500.






e. Structural

Construction of a 750 m3 elevated reinforced concrete reservoir

Construction of a 800 m3 ground reinforced concrete reservoir

Construction of reinforced concrete valve and washout chambers (precast

elements and in-situ)

f. Mechanical

Installation of borehole pumps

Installation of new isolation valves, hydrants and air valves

Installation of water meters

g. Electrical

Extension of high voltage power line

Installation of transformers at boreholes

Installation of LV Switchboards and MCCs at boreholes

Installation of cables at boreholes

h. Building Works

Construction of water kiosks

Reconstruction of boundary walls damaged by construction activities

i. Miscellaneous Works

Fencing around reservoirs and boreholes


Drilling of boreholes

Use of specialist construction equipment where working width is less than 3.5 m and

resettlement is not economically practicable (some areas in Mtendere)

Construction of ground and elevated concrete reservoirs


The Mtendere, Kamanga, Kwamwena and Ndeke–Vorna Valley areas are located in the

northeast of Lusaka and can be accessed from the Great East Road.

2.5 CSU15 – Chelston Pump Station Upgrade and Replacement

The main objective of the works under this project component is to improve the

performance of the existing Chelston sewer pump station by rehabilitating the pump station

and its ancillaries, the force main of DN250 HDPE pipeline and to rectify the flooding

problem that is currently persistent. This will be achieved by demolishing the existing

structures, stripping sewage contaminated topsoil and raising the station above flood level.

All technical equipment and the force main to Chelston Ponds will be replaced.






Figure 2-5: Location map of project intervention – CSU15


a. Preliminary Works

Demolition of existing dilapidated toilet and operations building structure

b. Temporary Works

Overpumping of sewage flows during station construction works

c. Civil

Pipelaying in buried DN250 HDPE pipe with ‘electrofusion’ joints

Platform earthworks in station ground level raising

Gravel access road construction

Excavation of open drainage

d. Structural

Structural concrete modification to an existing water retaining structure

e. Mechanical

Installation of new sewage duty submersible pumps.

f. Electrical

Upgrading of station power supply transformer

New electrical Motor Control Equipment associated with the new pumps






New small power electrical system to building and security lighting

g. Building Works

Construction of a new operations building

Renovation works to an existing wall fence

h. Miscellaneous Works

None

Description of Specialist / Non Standard Works Components

None


Suburb of Chelston, Greater Lusaka.

2.6 CSE44 – Sewer Expansion in Mtendere

The sewer expansion programme focuses on the introduction of a new sanitation collection

and discharge system. The planned infrastructure intervention will provide an extensive

sewer network to enable approx. 100,000 residents, living in an area of approx. 400ha, to

connect to a sewer system. The network construction will consist of some 82 kilometres of

new gravity sewer lines ranging in diameter from OD 160 to DN 400.



Resettlement activities in locations where minimum working width of 3.5 m is

not available

b. Temporary Works

None

c. Civil

Pipelaying in uPVC sewer pipes OD 160 to DN 400

Reinstatement of paved roads

Reinstatement of unpaved roads

d. Structural

Modification of an existing pump station structure in in-situ reinforced

concrete

Construction of manholes from precast concrete elements

e. Mechanical

Installation of new sewage pumping equipment at the Salama pump station

f. Electrical

Upgrading of the electrical supply to the Salama Sewage Pump Station

g. Building Works

Reconstruction of boundary walls damaged by construction activities






Construction of a new operator’s building at the Salama Pump Station


None


Installation of sewer pipe crossing of Great East Road by ‘pipe jacking’

Use of specialist construction equipment where working width is less than 3.5 m and

resettlement is not economically practicable


Township areas of Mtendere West and East with outfall lines to Salama Sewage Pump

Station (suburb of Avondale) and the Kaunda Square area, Greater Lusaka.

Figure 2-6: Location map of project intervention – CSE44

2.7 CSU4 – Kaunda Square Interceptor Upgrade

The Kaunda Square interceptor (CSU-4) crosses the eastern part of the city in a nearly

straight line from south to north, terminating at the Kaunda Square Ponds. Its alignment

follows the road along the north of Kaunda Square Stage II until the junction between

Kaunda Square Stages I and II and then heads northwest to the ponds crossing cultivated

fields and farm areas.






The downstream portion of the Kaunda Square interceptor does not have adequate

hydraulic capacity during wet weather. It was not designed as a combined system but has

become one due to poor stormwater management in the area. To address these problems,

and to provide capacity for sewer expansion, approximately 2,800 m of the downstream

portion of the Kaunda Square interceptor will be upgraded. Upgraded diameters are in a

range of OD 315 up to DN 400 (uPVC) and DN500 to DN 900 (reinforced concrete).

Figure 2-7: Location map of project intervention – CSU4



Resettlement activities in wayleave clearing

Relocation of ZESCO infrastructure

b. Temporary Works

Overpumping during replacement of sections of live sewer line

c. Civil

Pipelaying in uPVC pipes diameters OD 315 to DN 400

Pipelaying in reinforced concrete pipes diameters DN 500 to DN 900

d. Structural

Construction of manholes from precast concrete elements

e. Mechanical






None

f. Electrical

None

g. Building Works

Reconstruction of boundary walls disturbed by construction works


None


None


Kaunda Square suburb, Greater Lusaka. Accessed from the Great East Road at the PHI

roundabout.

2.8 TU5 & TE3 – Kaunda Square Treatment Ponds Upgrade and Expansion

The Kaunda Square Treatment Pond Upgrade and Expansion project component deals

with the rehabilitation, upgrading and expansion of the existing dilapidated ponds. The

proposed upgrading and expansion works (TU5 & TE3) are summarised as follows:

Modification of existing structures where possible;

Demolition and rebuilding of the rest of existing structure;

Removal of vegetation and dredging of ponds;

Construction of new anaerobic and facultative ponds, as wells as new sludge drying

beds;

A floating sludge removal facility (to be shared with other ponds);

Access road to the ponds site and service road and fencing around the ponds.



Acquisition of land for buffer and expansion area

b. Temporary Works

Dewatering and drainage of construction area

c. Civil

Stripping of topsoil to stockpile

Embankment forming in material obtained in cut

Road forming in gravel materials obtained from borrow

Provision of a small diameter water pipe connection to the Kaunda Square

water network.






d. Structural

Construction of new grit screening facility

Construction of pond inlet and outlet structures in cast in-situ concrete

e. Mechanical

None

f. Electrical

Provision of a 380v, 3 phase overhead power connection

Building small power installation

g. Building Works

Construction of an operators building


Site fencing


Pond lining in fusion welded HDPE liners

De-sludging of existing ponds using floating dredging equipment which is to

be procured through the contract

Figure 2-8: Location map of project intervention – TU5 & TE3






2.9 Tabular Summary of Works Components

Table 2-1: Summary of Works Components in Sub-projects

Sub-project LP1 LP6 LS2 LS3 CSU

4

CSE

44

CSU

15

TU5/

TE3

Work Item

Procurement

Foreign Procurement

Local Procurement

Temporary Over-pumping

Bulk earthworks

Pipelaying

Small diameter HDPE

Small diameter uPVC

Large diameter Concrete

Large diameter Steel

Domestic supply meters

Structural Concrete Work

Mechanical Works

Station Pipework

Large Valves and Meters

Pumps

Refurbish and reinstall

Electrical Works

Transformer Installations

Motor Control Centres

Small power systems

Building Works

Specialised Works

Pipe Jacking

Dredging

Borehole drilling

Resettlement Issues

Land acquisition

Clearing of wayleaves

Compensation

Environmental

Hazardous Wastes

Is a major component of the work

Is a minor component of the work

Is not included in the work






Table 2-3: Value Brackets of Sub-projects

Sub-project Value Bracket

LP1 Large

LP6 Very Large

LS2 Medium

LS3 Very Large

CSU4 Small

CSE44 Large

CSU15 Small

TU5 & TE3 Large






3. RECOMMENDED PACKAGING OF CONSTRUCTION CONTRACTS

This section of the report is intended to take the various sub-projects above and lump them

together and in some cases split them up in order to form works contract packages.

3.1 Packaging Rationale

The rationale used in selecting the works to go into each contract package is broadly as

follows:

1. Where possible all works in one geographical area should be carried out by the same

contractor. This minimises the amount of interaction between contractors and reduces

the chance of them interfering with each other’s work progress.

2. Where possible all works that are co-dependent are included in a single contract. In this

way the possibility of claims arising from a contractor due to the failure to perform by

another contractor is minimised.

3. Works of a dissimilar nature are generally kept in separate contracts unless they

represent a small part of the contract and can be easily subcontracted.

3.2 Contract Package 1 – CP1, Rehabilitation of Iolanda Treatment Works, Transmission

and Distribution Centres

Contract package CP1 will include all of the works in LP1. These works are largely

electromechanical and rehabilitation works with minor works in associated structural repairs.

This component contains much of the requirement for major, high impact shut downs which

will arise when the rising main is isolated for air valve replacement and when the reservoirs

are taken out of service for repairs. CP1 will therefore lead the programming of shut downs

and shut down windows for other contracts should be co-ordinated with this contract.

The performance of this contract is not in any way constrained by the performance of other

contracts.

The contract contains no resettlement or land acquisition activities.

The contract will fall into the ‘large’ value bracket.

3.3 Contract Package 2 – CP2, Primary Distribution Backbone Strengthening

Contract package CP2 will contain all the works in LP6. This consists of all large diameter

water primary distribution lines. The contract will have resettlement and compensation

issues, but requires no land acquisition. Some small duration shutdowns required for tie-ins,

but these can be co-ordinated with CP1 to prevent additional disruption. The performance

of this contract is not in any way constrained by the performance of other contracts.

This contract contains both the pipelaying through State House premises (along an existing

pipeline) and across the military ZAF city airport runway, both of which have been agreed to,

but will require special coordination during construction.

The contract will fall into the ‘very large’ value bracket.






3.4 Contract Package 3 – CP3, Water and Sewer Reticulation in the Kamanga, Mtendere,

Kaunda Square and Chelston Areas

Contract Package CP3 has been assembled from various design package components to

arrive at a works contract covering the adjoining areas of Kamanga, Mtendere, Kaunda

Square and Chelston. It specifically contains the following:

LS3 works in the Kamanga area

LS3 works in the Mtendere area

all of CSE44, the Mtendere Sewershed expansion including the proposed pumping

station upgrade on Salama Farm

all of CSU4, the Kaunda Square Interceptor

all of CSU15, the Chelston sewage pump station and force main

As such the works contract contains all sewer components and both of the sewage

pumping stations within the same contract. In addition, water and sanitation pipe-laying in

the same geographical area are combined to prevent interference between contracts.

Grouping of CSE44 and CSU4 is advisable as the works are similar; sewage from CSE44

feeds into CSU4 and by combining the need for interfaces between contracts is eliminated.

The shutdown requirements associated with this Contract are minimal and localised.

The contract will have resettlement and compensation issues, but requires no land

acquisition.

The combined contract package will fall into the ‘very large’ value bracket.

3.5 Contract Package 4 – CP4, Kaunda Square Waste Stabilisation Ponds

The contract contains all of the works in TU5 and TE3 for the upgrading and expansion of

the Kaunda Square ponds. The contract involves civil and earthworks and has few

similarities to the other contracts in the area. A single interface is required between CP3

and this contract at the new plant intake structure. The ability to complete this component is

not linked to completion of other components so it can be safely left on its own.

This package has no shut down requirements.

The contract requires land acquisition.

The contract package will fall into the ‘large’ value bracket.

3.6 Contract Package 5 – CP5, Water Reticulation in Ndeke, Kwamwena, SOS Village,

Chipata and Ng’ombe

Contract Package CP5 has been assembled from various design package components to

arrive at a works contract containing the following:

LS3 in Ndeke/ Vorna Valley

LS3 in Kwamwena

All of LS2 in SOS village, Chipata Township and Ngombe Township






4. SUMMARY OF CONSTRUCTABILITY CHECKLISTS

Annex I contains a constructability checklist for each of the design packages listed in

Chapter 3. At this stage of the design process the works have not been grouped into

construction Contract Packages (CP) so the constructability checks are carried out on the

individual sub-projects. The table below summarise the key points from the checklists.

Table 4-1: Constructability Checklist Summary Table

Works Package LP1 LP6 LS2 LS3 CSU

4

CSE

44

CSU

15

TU5/

TE3

Issues

Long Procurement Lead Times

Location of Existing Utilities

Access to Working Areas

Weather Disruption

Over-pumping and flow diversion

Geotechnical

Undefined geotechnical risk

Known rock occurrence

Blasting constraints

Known low bearing capacity

Groundwater in excavations

Traffic Accommodation

Public road traffic

Public access disruption

Shutdowns

Resettlement

Land Acquisition Required

Compensation for damage

Compensation for disruption

Environmental

Works largely unaffected by issue

Works moderately affected by issue

Works significantly impacted by issue






5. PROJECT CONSTRUCTION SCHEDULE

Time schedules have been developed for each of the proposed contract packages. Key

considerations and constraints in the scheduling of each component are given below. In

addition to the specific programming requirements shown below the following general

requirements have been considered:

1. Construction contracts start on 1st October 2013 in accordance with the Feasibility

Study stage timings.

2. Pre-contract activities for resettlement and land acquisition issues will need to start

before 1st October and it is assumed that a 6 month lead time would be sufficient.

3. At the commencement of the project there are time allowances for procurement of

materials. These have been applied as follows:

a. Local supply materials – 3 months. These include small diameter HDPE and

uPVC pipes.

b. Foreign supply materials – 6 months. This includes electromechanical

equipment (except the Iolanda-Chilanga High Lift pumps) and large diameter

pipes.

4. It is assumed that the contractor will be mobilising during the first 3 months of the

contract and that there will be limited activity during this time.

5.1 Contract Package 1 – CP1, Rehabilitation of Iolanda Treatment Works, Transmission

and Distribution Centres

Lead time on electromechanical equipment, especially the new high lift pumps, will

be 6-12 months.

Once new pumps arrive old units can only be swapped out for refurbishment 1 at a

time in each pump station. Refurbishment of can only commence once the first new

pump is installed and it is expected that refurbishment will take on average 3

months per unit.

Therefore the contract requires a minimum time period of 24 months. This will result in an

average monthly cash flow of less than per month but with a very high cash

flow amount up front to procure the electromechanical equipment required. This

requirement should be considered in the framing of the contract document.

5.2 Contract Package 2 – CP2, Primary Distribution Backbone Strengthening

Large diameter pipes will be foreign purchased with lead times from order to pipes

arriving of 3-6 months.

Experience shows1 productivity not exceeding 2 km per month for large diameter

pipelaying in a built up areas. Therefore the pipelaying activity alone is programmed

at an average 1.5 km per month.

1 Experience from various projects of various sizes and duration, supervised by GAUFF in East and Southern Africa in the past five

years.






Maximum average earning per month seen on recent contracts is between

and a maximum of million per month. Expected earnings

should not exceed per month.

Therefore this contract will require a time period of 24 months. Significant upfront cash flow

will be required for the procurement of pipes and fittings. This requirement should be

considered in the framing of the contract document. The contract contains provision for

separate payment for supply and installation of pipes and fittings which will ease the

requirements on the contractor’s cash flow.

5.3 Contract Package 3 – CP3, Water and Sewer Reticulation in the Kamanga, Mtendere,

Kaunda Square and Chelston Areas

80 km of small diameter sewer (<0.30m)

7.5 km of large diameter sewer (>0.30m)

60 km of small diameter water reticulation (<0.3m)

2 km of large diameter water reticulation (>0.3m)

Expected lead time on small pipes 3 months

Expected lead time on large pipes 3-6 months

Experience shows that productivity on pipe-laying for small pipes is in the range of

4km per team per month. Assuming 2 teams some 17 months will be needed to

complete the small diameter pipelaying

Pipe-laying for large diameter pipes will proceed at a rate not exceeding 2km per

month and will therefore require around 5-7.5 months.

5000 consumer meters in Mtendere will be installed at a rate on around 500 per

month, requiring 2 installation teams 10-12 months to complete

From the above, a 24 month contract duration is recommended. It is expected that small

diameter pipe procurement will continue throughout much of the duration of the works and

so will not place an undue burden on the contractor’s cash flow. The estimated average

cash flow is under .

5.4 Contract Package 4 – CP4, Kaunda Square Waste Stabilisation Ponds

The major work component is 300,000 m3 of bulk earthworks in forming the ponds.

Allowing for mobilisation and time lost to first rains plus the time required to dewater

the site earthworks will only commence in earnest 8 months after contract signing.

Programming the completion of earthworks works in 10 productive months, after

allowance for lost months in the second rainy season gives a requirement to

achieve 30,000 m3 per month. A typical earthworks team of 1 No. 20 ton excavator

will achieve 15,000 to 20,000 m3 per month. Therefore with 2 teams a ten month

period to complete earthworks is achievable. There is adequate space on site for 2

or more teams to work independently.

The contract requires the procurement of a dredge for desludging of the existing

ponds. This will be a long lead time item requiring 9 months from order to delivery.






From the above a 24 month contract period is recommended. The estimated average

monthly cash flow is under per month and is considered achievable even with

disruption for rains.

5.5 Contract Package 5 – CP5, Water Reticulation in Ndeke, Kwamwena, SOS Village,

Chipata and Ng’ombe

Kwamwena -97 km small diameter pipe (<0.3m)

Ndeke – 94 km small diameter pipe (<0.3m)

SOS, Chipata, Ng’ombe – 50 km small diameter pipe (<0.3m)

The contract therefore requires a total of 240 km of small diameter pipe. Assuming

that a team is able to achieve 4 km per month 15 months will be required for pipe-

laying with at least 4 teams.

Total of 12,000 customer meters are to be installed. This can be achieved in 12

months by 4 teams at an aggregate rate of 1,000 meters per month.

From the above a 24 month contract period is recommended. The estimated average

monthly cash flow is under per month.

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LP1- Constructability Checklist

Checklist Item Constructability Further action required

1. GENERAL

1.1. Are areas available for:

1.1.1. Contractor’s camp and offices Suitable commercial rental properties are available within 5 km of the project area

1.1.2. Materials stockpiles As above

Most materials will be new and will be kept in secured Contractor’s stores

1.1.3. Disposal of waste materials Non soil waste to be disposed in Council designated waste dumps

Topsoil and unsuitable materials that cannot be disposed of on-site shall be disposed of in gravel material borrow pits

Removed equipment will be handed over to LWSC at Lusaka Water Works

Disposal of toxic material such as transformer dielectric oil will be handled and disposed of in accordance with the current local and international environmental regulations

Specifications to contain clauses for proper waste disposal

1.2. Are the necessary skilled personnel available in the local market and where necessary will the contractor be able to bring in staff from outside the country?

Required trades are available within Zambia. Immigration rules allow for management staff and staff with specialist skills to be brought from outside the country

1.3. Do the works require the importation of any high value items of specialist plant? If so have alternatives that eliminate this need been considered?

The works require importation of high value items such as pumps, controls, and large diameter gate valves, air valves etc. Items such as pumps and control panels are generally custom made and alternatives are very limited or unavailable

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1.4. Will double handling of materials be involved?

Pumps, fittings, manhole covers, step irons, spindles, and control panels (etc.) will need to be stored in secured stores at the contractor’s yard and delivered to site at time of installation to prevent issues of theft/ vandalism and damage from elements

Concrete rings for manholes may be delivered directly to the point of use

1.5. Is there space for stockpiling of materials?

Yes

1.6. Are utility locations accurately defined?

Not applicable as works are being done in existing facilities.

1.7. Has the need for utility relocation been identified and have the costs been defined with the appropriate utility?

Not applicable

1.8. Access consideration

1.8.1. Are personnel work areas easily accessible?

All structures and work areas are easily accessible

Some works areas along the Treated Water Main are only accessible by foot. The works in these areas are limited to replacement/ servicing of fittings and installation of manhole chambers (etc.) Transportation of these items could be achieved by use of purpose made trolleys

1.8.2. Is there access for excavation plant?

No access constraints. Only manual excavation is envisaged

1.8.3. Is there access for haulage trucks to all areas they need to dump?

No access constraints

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1.8.4. Are there traffic restrictions or congestion issues affecting site access?

No

1.8.5. Are there measures available such as opening up temporary access routes that would considerably improve constructability?

Not required

1.9. Will weather become a factor for the successful completion of the job?

Much of the works will be done indoors (electromechanical installation)

Excavation and backfilling operations for pipe and fitting replacements would become an issue in the heavy rainfall months of December to March

Major earthworks should be planned in dry months i.e. April to November

1.10. Efficiency of construction

1.10.1. Are there non-standard or complex methods of construction and could any of these be simplified?

No. Standard construction methods used throughout

Lifting equipment will be required

The contractor must provide a crane mounted truck as part of their main equipment

1.10.2. Has construction sequencing been considered in the design?

Yes. Replacement of pumps, valves and fittings etc. will be done in stages to allow for partial availability of plant and continued water production and supply

Include relevant specifications on shutdowns (also see Item 9)

1.11. Construction efficiency in specification

1.11.1. Are specifications adequate to meet functional requirements without being unnecessarily onerous which may introduce construction difficulties?

No non-standard specification provisions or tolerances have been introduced

Pumps are specified with the existing configuration in order to minimise pipe modifications

Further review of specification at 90% design

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1.11.2. Have new items been introduced in the specifications/ method of measurement where standard items might suffice?

No

1.11.3. Do the specifications contain any restrictive clauses regarding source of material or equipment or manufacturing standard which may reduce options for competitive pricing?

All pumps, equipment and materials etc. will be specified in terms of functional requirements only

Where manufacturer’s names are used in the specifications or drawings, these are always suffixed with ‘or equivalent, or better’ to remove restriction whilst placing the emphasis on the contractor to demonstrate equality

1.12. Are pay items in the bid tabulation apparent in the specifications and in the drawings?

A standard specification and method of measurement is used (CESMM) and new items only introduced where the work items are not covered by the standard

Drawings need to contain cross references to pay items

Add cross references to drawings including tag numbers for mechanical equipment

Divide certain pay items in the BoQ such as concrete, earthworks etc. to indicate the location of the work

1.13. Are materials purchasing requirements simple to accurately extract from the Bill of Quantities?

CESMM bills use separate ‘supply’ and ‘install’ items for pipes and fittings

Mechanical and electrical components are individually itemised

Ensure ‘supply’ and ‘install’ quantities are consistent

Ensure all items of E&M equipment are uniquely referenced in drawings, specifications and BoQ

Ensure drawings contain sufficient labelling and callouts to reference with items in the BoQ

2. EARTHWORKS

2.1. Has the design been earthworks balanced to reduce the need for imported materials?

Not applicable

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2.2. Where imported materials are required is the specification appropriate to the requirement?

Yes, for bedding and selected backfill to pipelines and fittings

3. PIPELAYING

3.1. Have the materials through which trenches are to be excavated been properly categorised?

Excavations for pipe and fitting replacements will be in existing backfilled trenches and around chambers

3.2. Have any potential areas of ‘hard’ or intermediate excavation been identified and have sufficient quantities of such excavation been allowed for in the BoQ?

Not applicable

3.3. Are trenches stable to the required digging depths or is shoring required. Do the specifications and drawings indicate the areas where shoring is required?

Excavations are mainly shallow and stable and no shoring will be required.

3.4. Is groundwater likely to be encountered in any excavations?

No

3.5. Is specialist equipment required and if so have alternatives been considered to eliminate the need for it?

No

3.6. Is rock likely to be encountered and has provision been made in the designs?

No

3.7. Is rock blasting possible or are alternative measures for rock removal required?

Not applicable

4. STRUCTURES

4.1. Are founding conditions suited to the structure foundation design?

Yes, for existing structures and new chambers

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4.2. Is sufficient working space available for structural works?

There are no constraints envisaged

5. MECHANICAL

5.1. Is mechanical equipment specified ‘standard’ and well supported with spares and technical knowledge?

All mechanical equipment is standard and regional availability has been checked. Sources for ‘‘special pumps – high lift ’’ have been identified too.

5.2. Is any long manufacturing lead time mechanical equipment specified and could this be replaced by more standard ‘off the shelf’ equipment?

Yes, specifically for the Iolanda and Chilanga high lift pumps & motors. The equipment is functional specific and cannot be replaced by any “off the shelf equipment”.

Allow for manufacturing time of E&M equipment in construction program

5.3. Is all mechanical equipment accessible for installation, maintenance and replacement?

Manufacturer’s minimum space requirements have been adhered to

Lifting equipment will be used wherever lifting is required.

Trolleys will also be used for transporting heavy equipment over shorter distances.

5.4. Are the functional requirements of all mechanical equipment clearly indicated in the drawings or bills of quantities?

Drawings should include part numbers cross referencing detailed descriptions in the specification

Ensure cross referencing and detailed itemised descriptions of function and manufacturing requirements in specification.

6. ELECTRICAL

6.1. Are electrical standards used in design appropriate to local practice?

IEE standards used together with local ZESCO regulations

6.2. Is electrical equipment specified ‘standard’ and well supported with spares and technical knowledge?

All electrical equipment types are locally supported

6.3. Is any long manufacturing lead time electrical equipment specified and could this be replaced by more standard ‘off the shelf’ equipment?

Yes, specifically for the Iolanda and Chilanga high lift pumps & motors. The equipment is functional specific and cannot be replaced by any “off the shelf equipment”

Allow for manufacturing time of E&M equipment in construction program

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6.4. Are electrical designs appropriate for tropical installation and have resilience to lightning strikes and power fluctuations been considered?

All electrical designs shall incorporate appropriate lightning protection

All designs are of a form commonly used in LWSC facilities. Robust starting equipment is specified

7. BUILDINGS

7.1. Are building materials specified readily available?

All are local stock items

7.2. Are founding conditions suited to the building foundation design?

Yes

8. TRAFFIC ACCOMMODATION

8.1. Is public access disrupted? No

8.2. Has access disruption to local businesses been considered?

Not applicable

8.3. Has provision been made to ensure local people have access to their properties?

Not applicable

8.4. Is there provision for a traffic management plan?

Not applicable

9. SHUTDOWNS

9.1. Will provision of water/ sanitation services be disrupted?

Yes, shutdowns will be needed at the intake, Iolanda treatment plant, Chilanga booster station and DCs when works are being rehabilitated/ replaced

Replacement of pumps, valves and fittings etc. will be done in stages so as to allow for partial availability of plant and continued water production and supply.

Specifications to contain clauses for partial shutdown of plants.

Specifications to indicate maximum period of disruption of water supply.

Specification/BoQ to include item for advertisement/ announcement of water supply disruption in local newspaper and on radio.

9.2. Is there provision for a shutdown management plan?

This will need to be agreed to with LWSC to minimise disruptions and coordinate between various work components

Specification to include requirements for shutdown management plan.

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10. RESETTLEMENT

10.1. Is sufficient survey data available to identify resettlement need?

Yes. The works will be done in existing facilities with no element of resettlement.

10.2. Has a resettlement corridor of impact been identified and constraints arising from it indicated in the drawings

Not applicable

10.3. Where the need for resettlement has been identified have design change options been considered to eliminate or reduce resettlement needs?

No resettlement required

10.4. Is sufficient space available for working without disruption to buildings and walls?

Yes

11. ENVIRONMENTAL

11.1. Have construction waste materials been identified and disposal methods specified?

Major arisings will be earth, crushed concrete and building rubble. The former can be disposed of in borrow pits whilst the latter two can be incorporated into site filling.

Minor arisings will be steel which can be recycled in Lusaka and timber which must be disposed of at landfill.

Specification to include landfill requirements. BoQ item to be provided for Council landfill disposal costs.

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11.2. Are any hazardous wastes expected and are safe disposal methods/ procedures specified?

Spillage of oils from pumps will have to contained and cleaned up.

Old transformers may contain oil with PCBs. Spillage of oil containing PCBs from Transformers may arise.

Some sludge from sedimentation tanks will arise which will have to be disposed of at licensed landfill site

Include containment and clean-up of any oil spills.

Mineral oil will be specified for new transformers.


12. HEALTH AND SAFETY

12.1. As designed, do the construction methods have any intrinsic safety issues? Have these been addressed in the specification?

Installation of heavy equipment should be done with help of lifting equipment.

Excavations are generally shallow and geotechnical investigations indicate stable trenching conditions.

The specifications need to contain detailed requirements for all installation of heavy equipment stating the minimum weight of the equipment that could be lifted manually.

12.2. Are National Health and Safety regulations sufficiently rigorous when compared to international best practice or should additional HS clauses be included?

Final ESIA will cover health and safety and will propose additional specification clauses

Include relevant HS clauses

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LP6- Constructability Checklist


1. GENERAL





Topsoil and unsuitable materials that cannot be disposed of onsite shall be disposed of in gravel material borrow pits




None required

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Steel pipes shall be stocked in available spaces along the pipeline routes and later transferred to the excavated trenches during installation

Steel pipeline fittings and appurtenances shall be stockpiled at the contractor’s yard and delivered to site at time of installation to prevent issues of theft/ vandalism

Earthworks materials and special bedding materials may be delivered directly to the point of use


Space exists along the pipeline alignment for stringing of pipes and dumping of special bedding materials


Overhead utilities (ZESCO and ZAMTEL) have been accurately surveyed and referenced on the drawings

Locations of existing underground cables and pipes have been obtained from the relevant utility providers and are shown on the drawings


Some existing water pipelines shall need to be relocated

The estimated costs of relocation to be included in BoQs





Section of pipeline route along State House fence shall need to be widened. This will involve demolition and reinstatement of an existing fence.

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Several market stalls, business stalls and other temporary structures have been constructed along the pipeline way-leaves.

Will be addressed under the RAP consultancy


Demolition of structures hindering access and constructability has been provided for


Trenching and backfilling operations become an issue in the heavy rainfall months of December to March

Make allowances for reduced productivity in these months in the project timescale



Use of ‘drilling/tunnelling’ method of construction may be adopted in laying pipelines under Kafue road or ZAF runway. These could be simplified if open trench excavation is permitted.


Yes. The pumping mains from LWW junction to Stuart Park and Lumumba Reservoirs shall be completed before work commences on the other two sections of the Lp6 pipeline. Hence increasing the amount of water available to be distributed to consumers as a priority.


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No non-standard specification provisions or tolerances have been introduced.



No


All equipment and materials etc. are specified in terms of functional requirements









Mechanical components are individually itemised


Ensure all items of equipment are uniquely referenced in drawings, specifications and BoQ


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2. EARTHWORKS


Yes. However, a number of sections of LP6 pipeline are very rocky and shall require imported material for backfilling.


Yes. Details of quality of material for imported backfill are provided for in the specifications

3. PIPELAYING


Geotechnical investigations have characterised the materials throughout


Extra-over excavation for areas with rock has been provided for in the BoQs

Extent and depth of intermediate excavation material to be marked on profile drawings cross referenced to geotechnical investigations


No deep trenches. Geotechnical investigations showed stable trench walls throughout this area


None was detected within the influence zone of trenches during geotechnical investigations


Steel welding equipment is required for large diameter pipe jointing. The equipment is specialist but relatively inexpensive and justified by the improved final product


Yes. Extra-over excavation for areas with rock has been provided for in the BoQs

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Non-explosive rock blasting is recommended where works are close to built-up areas and near high-voltage ZESCO power lines

Specifications to clearly state where non-explosive rock blasting is required and what type is acceptable (e.g. fractac, gas system, etc.)

4. STRUCTURES


Yes. The ground conditions are suitable for the construction of reinforced concrete valve/ washout chambers


No constraints

5. MECHANICAL


All mechanical equipment is standard and regional availability has been checked


None




Drawings should include itemised descriptions and BoQ should include cross referencing to the specifications

Ensure cross referencing and detailed itemised descriptions of function and manufacturing requirements in specification

6. ELECTRICAL


Not applicable


Not applicable

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None


Not applicable

7. BUILDINGS




Geotechnical investigations have confirmed founding conditions


8.1. Is public access disrupted? There are several road crossings and 2 No. railway crossings

Ensure that dealing with access disruption is included in the specifications


Yes. Removal of market stalls and informal shops along the pipeline routes will be addressed in RAP.

Ensure inclusion in RAP


The specifications provide for temporary provision of access to people’s properties during construction

Ensure provision of temporary access during construction is included in the specifications


Provision of ensuring control of traffic e.g. through placement of adequate signs and manual flagging is included in the specifications

Ensure provision of traffic management system is included in the specifications

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9. SHUTDOWNS


Yes. Minor shutdowns are required for interconnections of the pipeline to Stuart Park and Lumumba reservoirs, existing pipeline at Munali roundabout and the junction next to Roadside boreholes. A one day shut-down shall be required at Chilanga Pumping Station to allow for the interconnection of the DN 1200 with existing DN 900 next to LWW.

Specifications to indicate maximum period of disruption of water supply.

Specification/BoQ to include item for advertisement/ announcement of water supply disruption in local newspaper and on radio



Specification to include requirements for shutdown management plan

10. RESETTLEMENT


Detailed topographical survey has picked up all walls and buildings near to pipelines.


The RCOI has been defined and some market stalls along the pipeline route shall need to be removed to allow for the construction of the pipeline.


Yes, the selected pipeline route has considered the best option where resettlement shall be minimal or none.


No, some areas shall require buildings, and walls which are in the road wayleaves to be removed to allow for the construction of the pipeline


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11. ENVIRONMENTAL


Major arisings will be earth, crushed concrete and building rubble. The former can be disposed of in borrow pits whilst the latter two can be incorporated into site filling

Minor arisings will be steel which can be recycled in Lusaka and timber which must be disposed of at landfill

Specification to include landfill requirements. BoQ item to be provided for Council landfill disposal costs


None



Some pipelaying works need to be carried out parallel to high and low voltage power lines. Discussions with ZESCO have indicated that some of these lines may be shut down to accommodate the works. Otherwise special care must be undertaken whilst working in these areas, especially the area between LWW and Lumumba DC

Open trenches are a safety hazard and will need to be properly fenced off and closed as soon as possible

Excavations are shallow and geotechnical investigations indicate stable trenching conditions

The specifications need to contain detailed requirements for works near power lines

The specifications need to contain detailed requirements for health and safety regarding trenches, dust, etc.




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LS2- Constructability Checklist


1. GENERAL









None required

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uPVC pipes, steel fittings and appurtenances shall be stockpiled at the contractor’s yard and delivered to site at time of installation to prevent issues of theft/ vandalism






Locations of existing underground cables and pipes have been obtained from the relevant utility providers and have been shown on the drawings


Some existing water pipelines shall need to be relocated





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Some sections are accessible only along the main roads servicing Ng’ombe, Chipata and northern part of SOS East. Several other streets have been reduced to narrow paths because of informal housing and market stalls constructed within the way-leaves. These have left limited space to lay the pipelines except in the middle of the paths/roads.

No access constraints in SOS East except for a very small section in the north





Several streets have been reduced to narrow paths because of informal housing and market stalls constructed within the way-leaves





Make allowances for reduced productivity in these months in the project timescale in the Contract Document



No. Standard construction methods used

throughout

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Yes. The secondary mains and water kiosks are planned to be completed before work commences on the tertiary mains and house connections.






No









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2. EARTHWORKS


Yes. However, some areas are rocky and will require imported material for backfilling.



3. PIPELAYING





Extent and depth of intermediate excavation material to be marked on profile drawings and cross referenced to geotechnical investigations


No deep trenches. Geotechnical investigations showed stable trench walls throughout the areas under LS2



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No specialist equipment is required


Yes. Extra-over excavation for areas with rock has been provided for in the BoQs.




4. STRUCTURES


Yes. The ground conditions are suitable for the construction of water kiosks and valve/washout chambers


No constraints

5. MECHANICAL




None



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6. ELECTRICAL


Not applicable


Not applicable


None


Not applicable

7. BUILDINGS


All are local stock items.


Geotechnical investigations have confirmed founding conditions.


8.1. Is public access disrupted? There are several street crossings within project areas of LS2. Similarly, some of the internal streets of Ng’ombe and Chipata are narrow and normal movement of public shall be disrupted during construction.


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9. SHUTDOWNS


Yes. Minor shut-downs will be necessary to allow for the interconnections of the new pipelines to existing pipelines. These shall be done by manually operating the sluice/gate valves that are nearest to the interconnection points.

Specifications to indicate maximum period of disruption of water supply





10. RESETTLEMENT


Detailed topographical survey has picked up all walls and buildings near to pipelines


The RCOI has been defined and some buildings and market stalls along the pipeline routes shall need to be removed to allow for the construction of the pipelines

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Yes, the selected pipeline route has considered the best option where resettlement shall either be minimal or none


No, some areas shall require some buildings, walls amongst other structures to be moved to allow for the construction of the pipelines.


11. ENVIRONMENTAL


Major arisings will be earth, crushed concrete and building rubble. The former can be disposed of in borrow pits whilst the latter two can be incorporated into site filling


Specification to include landfill requirements. BoQ item to be provided for Council landfill disposal costs


None








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LS3- Constructability Checklist


1. GENERAL









None required

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uPVC pipes, steel fittings and appurtenances shall be stockpiled at the contractor’s yard and delivered to site at time of installation to prevent issues of theft/ vandalism

Mass concrete shall be mixed at contractor’s batching plant and transferred to tank sites for in-situ construction



Space exists along the pipeline alignment for stringing of steel pipes and dumping of special bedding materials



Locations of existing underground cables and pipes have been obtained from the relevant utility providers and have been shown on the drawings


Some existing water pipelines will need to be relocated

New power connections will be required at borehole sites in Ndeke/Vorna-Valley and Kwamwena areas


Ensure costs for new power connections are included in the BoQ




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Some sections are accessible only along the main roads servicing Mtendere and Kamanga. Several other streets within them have been reduced to narrow paths because of informal housing and market stalls constructed within the way-leaves. These have left limited space even to lay the pipelines except in the middle of the paths/roads

No access constraints in Kwamwena and Ndeke/Vorna-Valley





Several streets in the inner parts of Mtendere and Kamanga have been reduced to narrow paths because of informal housing and market stalls constructed within the way-leaves








No. Standard construction methods used

throughout


Yes. The boreholes are to be completed before the rising mains are constructed

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No















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2. EARTHWORKS


Yes. However, some areas are rocky and will require imported material for backfilling.



3. PIPELAYING





Extent and depth of intermediate excavation material to be marked on profile drawings and cross referenced to geotechnical investigations


No deep trenches. Geotechnical investigations showed stable trench walls throughout the areas under LS3

The foundation depths for the new reservoirs in Kwamwena and Ndeke/Vorna-Valley are not deep as the geotechnical investigations revealed



Groundwater shall only be encountered in the borehole drilling sites of Ndeke/Vorna-Valley and Kwamwena

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Use of concrete pump, cranes or other lifting mechanisms shall be necessary for the transfer of concrete for the construction of the elevated concrete tank in Ndeke/Vorna-Valley

Borehole drilling equipment (rig)


Yes. Extra-over excavation for areas with rock has been provided for in the BoQs




4. STRUCTURES


Yes. The ground conditions are suitable for the construction of storage reservoirs, water kiosks and valve/washout chambers


No constraints

5. MECHANICAL




None



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6. ELECTRICAL


IEE standards used together with local ZESCO regulations




No. borehole pumps are standard



All designs are of a form commonly used in LWSC facilities. Robust starting equipment is specified

7. BUILDINGS






8.1. Is public access disrupted? There are several street crossings within project areas of LS3. Similarly, some of the internal streets of Mtendere and Kamanga are narrow and normal movement of public shall be disrupted during construction.


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9. SHUTDOWNS


Yes. Minor shut-downs will be necessary to allow for the interconnections of the new pipelines to existing pipelines. These shall be done by manually operating the sluice/gate valves that are nearest to the interconnection points.

Specifications to indicate maximum period of disruption of water supply





10. RESETTLEMENT


Detailed topographical survey has picked up all walls and buildings near to pipelines

Land acquisition is necessary for the proposed borehole and tank sites in Ndeke/Vorna-Valley and Kwamwena as well as the water kiosks in Kamanga and Kwamwena


The RCOI has been defined and some buildings and market stalls along the pipeline routes shall need to be removed to allow for the construction of the pipelines

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Yes, the selected pipeline routes have considered the best options where resettlement shall either be minimal or none. Similarly, in choosing the locations of the reservoirs and boreholes, sites that have been allocated for public use were considered as much as possible.


No, some areas shall require some buildings, walls amongst other structures to be moved to allow for the construction of the pipelines.


11. ENVIRONMENTAL


Major arisings will be earth, rock, crushed concrete and building rubble. The former can be disposed of in borrow pits whilst the latter two can be incorporated into site filling


Water arising from the borehole drilling process shall be directed to roadside drains.



None.

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Caution must be taken while working at the elevated concrete tank in Kwamwena




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CSU15- Constructability Checklist


1. GENERAL


1.1.1. Contractor’s camp and offices Suitable commercial rental properties are available within 5km of the project area


1.1.3. Disposal of waste materials Non soil waste to be disposed in council designated waste dumps

Topsoil and unsuitable materials that cannot be disposed of on site shall be disposed of in gravel material borrow pits

1.2. Are the necessary skilled personnel available in the local market and where necessary will the contractor be able to bring in staff from outside the country.

Required trades are available within Zambia. Immigration rules allow for management staff and staff with specialist skills to be brought from outside the country.

1.3. Do the works require the importation of any high value items of specialist plant. If so have alternatives that eliminate this need been considered?

None required


Force main pipe materials will need to be stockpiled at the contractor’s yard and delivered to site at time of installation to prevent issues of theft/ vandalism.

Earthworks materials and special bedding materials may be delivered directly to the point of use.



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1.6. Are utility locations accurately defined Overhead utilities (ZESCO) have been accurately surveyed and referenced on the drawings.

On the force main alignment a conflicting electricity cable has been reported by ZESCO during a site visit but is not yet reflected on the drawings.

No other buried services are known to exist after consultation with utility companies

In agreement with ZESCO the force main is to be removed from the South of their wayleave and installed on the north side. The ZESCO cable will be reflected in 90% design drawings.

1.7. Has the need for utility relocation been identified and have the costs been defined with the appropriate utility

No utility relocation required


1.8.1. Are personnel work areas easily accessible


1.8.2. Is there access for excavation plant


1.8.3. Is there access for haulage trucks to all areas they need to dump


1.8.4. Are there traffic restrictions or congestion issues affecting site access

None

1.8.5. Are there measures available such as opening up temporary access routes that would considerably improve constructability

Not Required

1.9. Will weather become a factor for the successful completion of the job



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1.10.1. Are there non standard or complex methods of construction and could any of these be simplified

No. Standard construction methods used throughout.

Use of ‘elecrofusion’ HDPE pipe is not normal is Zambia. This is not considered a drawback however as skills and equipment are regionally available and ‘electrofusion’ has been chosen because it is an automated welding process requiring special equipment but less operator skill than ‘butt welding’ and offering better hydraulic and mechanical performance than flanged joints. It is also considered an appropriate new technology to introduce to LWSC and Zambia.

1.10.2. Has construction sequencing been considered in the design

Yes. New force main construction will be completed before works commence on the pump station, minimising over-pumping time.

An over-pumping connection point is designed as a permanent feature of the new force main


1.11.1. Are specifications adequate to meet functional requirements without being unnecessarily onerous which may introduce construction difficulties.

No non standard specification provisions or tolerances have been introduced.


1.11.2. Have new items been introduced in the specifications/ method of measurement where standard items might suffice

No. BoQ preparation is by different staff to design preparation. Designers are only called on to provide new specification or MoM items where those preparing BoQs cannot find applicable standard items

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Restricting the source of pumps was considered but has been rejected based on comments from the Client. All pumps will be specified in terms of functional requirements only.

Manufacturer’s names, where used in the specifications or drawings, are always suffixed ‘or equal’ to remove restriction whilst placing the emphasis on the Contractor to demonstrate equality.

1.12. Are pay items in the bid tabulation apparent in the specifications and in the drawings

A standard specification and method of measurement is used (CESMM) and new items only introduced where the work items are not covered by the standard.

Drawings need to contain cross references to pay items.



1.13. Are materials purchasing requirements simple to accurately extract from the Bill of Quantities

CESMM bills use separate ‘supply’ and ‘install’ items for pipes and fittings.



Ensure all items of mechanical and electrical equipment are uniquely referenced in drawings, specifications and BoQ.


2. EARTHWORKS

2.1. Has the design been earthworks balanced to reduce the need for imported materials

No. There are no cut sources available within this component

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2.2. Where imported materials are required is the specification appropriate to the requirement.

3. PIPELAYING

3.1. Have the materials through which trenches are to be excavated been properly categorised

Geotechnical investigations have characterised the materials throughout.

3.2. Have any potential areas of ‘hard’ or intermediate excavation been identified and have sufficient quantities of such excavation been allowed for in the BoQ

One area of ‘intermediate’ material has been identified and BoQ provision has been made

Extent and depth of intermediate excavation material to be marked on profile drawings cross referenced to geotechnical investigations.

3.3. Are trenches stable to the required digging depths or is shoring required. Do the specifications and drawings indicate the areas where shoring is required.

No deep trenches. Geotechnical investigations showed stable trench walls throughout this area.

3.4. Is groundwater likely to be encountered in any excavations

None was detected within the influence zone of trenches during geotechnical investigations.

3.5. Is specialist equipment required and if so have alternatives been considered to eliminate the need for it.

Electrofusion equipment is required for pipe jointing. The equipment is specialist but relatively inexpensive and justified by the improved final product.

3.6. Is rock likely to be encountered and has provision been made in the designs

3.7. Is rock blasting possible or are alternative measures for rock removal required

4. STRUCTURES

4.1. Are founding conditions suited to the structure foundation design

No new structure foundations required

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4.2. Is sufficient working space available for structural works

No constraints

5. MECHANICAL

5.1. Is mechanical equipment specified ‘standard’ and well supported with spares and technical knowledge.


5.2. Is any long manufacturing lead time mechanical equipment specified and could this be replaced by more standard ‘off the shelf’ equipment.

None

5.3. Is all mechanical equipment accessible for installation, maintenance and replacement.


5.4. Are the functional requirements of all mechanical equipment clearly indicated in the drawings or bills of quantities.

Drawings should include part numbers cross referencing detailed descriptions in the specification


6. ELECTRICAL

6.1. Are electrical standards used in design appropriate to local practice.

IEE standards used

6.2. Is electrical equipment specified ‘standard’ and well supported with spares and technical knowledge.


6.3. Is any long manufacturing lead time electrical equipment specified and could this be replaced by more standard ‘off the shelf’ equipment.

None

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6.4. Are electrical designs appropriate for tropical installation and have resilience to lightning strikes and power fluctuations been considered


All designs are of a form commonly used in LWSC facilities. Robust DOL starting equipment is specified

7. BUILDINGS

7.1. Are building materials specified readily available


7.2. Are founding conditions suited to the building foundation design



8.1. Is public access disrupted. No road crossings or disruption to public traffic either motorised or pedestrian.

8.2. Has access disruption to local businesses been considered

None identified along the pipeline route

8.3. Has provision been made to ensure local people have access to their properties

No property access affected

8.4. Is there provision for a traffic management plan

Not required

9. SHUTDOWNS


No. Over-pumping will ensure uninterrupted function



Specification to include requirements for shutdown management plan.

10. RESETTLEMENT


Detailed topo survey has picked up all walls and buildings near to pipelines

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No works are constrained by resettlement needs.

10.3. Where the need for resettlement has been identified have design change options been considered to eliminate or reduce resettlement needs

No resettlement required

10.4. Is sufficient space available for working without disruption to buildings and walls

Yes, in all areas.

11. ENVIRONMENTAL

11.1. Have construction waste materials been identified and disposal methods specified

Major arisings will be earth, crushed concrete and building rubble. The former can be disposed of in borrow pits whilst the latter two can be incorporated into site filling.

Minor arisings will be steel which can be recycled in Lusaka and timber which must be disposed of at landfill.

Specification to include landfill requirements. BoQ item to be provided for council landfill disposal costs.

11.2. Are any hazardous wastes expected and are safe disposal methods/ procedures specified.

Some sewage sludge will arise which will have to be taken to a licensed landfill site



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12.1. As designed, do the construction methods have any intrinsic safety issues. Have these been addressed in the specification.

Some pipelaying works need to be carried out parallel to power lines. Discussions with ZESCO have indicated that these lines have redundancy and may be shut down to accommodate the works. Otherwise hand excavation will be specified.

Excavations are shallow and geotechnical investigations indicate stable trenching conditions.

The specifications need to contain detailed requirements for all works parallel to power lines.

12.2. Are National Health and Safety regulations sufficiently rigourous when compared to international best practice or should additional HS clauses be included.


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CSU15- Constructability Checklist 3 – Function

Checklist Item Constructability Further action required by 90% Design Stage

13. GENERAL



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CSU-44 Mtendere Sewershed Expansion Constructability Checklist


1. GENERAL




1.1.3. Disposal of waste materials Most arisings from excavation will be returned to the trenches.

Any unsuitable materials will be hauled to the selected materials borrow pits.




The narrow working width will require the use of short overhang excavators but these are readily available and not particularly high value items. TLB excavators could be used as an alternative but will offer lower productivity.


Pipes will have to be stockpiled at the contractor’s yard before being brought to site for installation. Theft of small diameter pipes means that on site stockpiling will not be possible.


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Locations of existing underground cables and pipes have been obtained from the relevant utility providers and are shown on the drawings. However plotting accuracy of these is poor and hand excavation will be required in locations where services are expected to exist.


No services relocation needs have been identified






Access widths are narrow, generally around 3.5m. Thus while all trucks and plant will be able to access the works, short overhang excavators, able to swing in such confined spaces, are expected to be used.




The area is served by several main access roads which are largely uncongested outside of morning and evening rush hour.


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Not required






Use of pipe jacking is proposed for one sewer crossing of the Great East Road. The method is required as trenching will disrupt one of the busiest arterial roads as well as endangering multiple key services including power and data trunk lines.


No constraints.






No

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All equipment and materials etc. will be specified in terms of functional requirements only













2. EARTHWORKS


No bulk earthworks required


Yes. Details of quality of material for imported backfill are provided for in the specifications.

3. PIPELAYING

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Extra-over excavation for areas with rock has been provided for in the BoQs with nominal quantities but no rock was identified in any trial hole or SPT test carried out in Mtendere



Deep trenches (>2m) are required for various sections of sewer line. Shoring of these will be required whenever people must enter the trench to work.


Groundwater is expected to be encountered in the deeper sewer lines and especially in the months just following rainy season but only at depths >1m. Working uphill in trench excavations will be sufficient to keep them dewatered.


Short overhand excavators are expected to be used for trenching in confined areas.


No rock was encountered during geotechnical investigations.


Rock is not expected but blasting would not be allowed in these built up areas.

Specifications to include acceptable rock breaking measures

4. STRUCTURES

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Yes. Ground conditions have been confirmed from geotechnical investigations


No constraints

5. MECHANICAL




None


Manufacturer’s minimum space requirements have been adhered to.


Drawings should include part numbers cross referencing detailed descriptions in the specification.


6. ELECTRICAL


IEE standards used




None

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All designs are of a form commonly used in LWSC facilities.

7. BUILDINGS






8.1. Is public access disrupted? There are numerous road crossings and trenches in roads within the Mtendere Township area.

Specifications will limit the length of open trench allowed to minimise disruption to traffic but there will be areas cut off from vehicle access










9. SHUTDOWNS


No. The existing area has no sanitation services so there will be no disruption.

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Sewer tie ins with the CSU-4 Kaunda Square interceptor will need to be co-ordinated with LWSC

10. RESETTLEMENT




The RCOI has been defined and some market stalls along the pipeline route shall need to be removed to allow for the construction of the pipeline.


Impact has been minimised by specifying a narrow (3.5m) available working corridor.


No, some areas shall require buildings, and walls which are in the road wayleaves to be removed to allow for the construction of the pipelines


11. ENVIRONMENTAL


Major arisings will be earth, and building rubble. The former can be disposed of on site or in borrow pits whilst the latter can be incorporated into site filling.



None


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Pipelaying in deep trenches will require shoring of the trenches.

Geotechnical investigations indicate stable trenching conditions




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CSU-4 Kaunda Square Interceptor Constructability Checklist


1. GENERAL




1.1.3. Disposal of waste materials Most arisings from excavation will be returned to the trenches.

Any unsuitable materials will be hauled to the selected materials borrow pits.




None


Pipes will have to be stockpiled at the contractor’s yard before being brought to site for installation. Some stringing of pipes along the proposed route will be possible with adequate security


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Locations of existing underground cables and pipes have been obtained from the relevant utility providers and are shown on the drawings. However plotting accuracy of these is poor and hand excavation will be required in locations where services are expected to exist.


There is a need to relocate certain ZESO power infrastructure which has been indicated to ZESCO. Quotations will be obtained.

ZESCO quotation values will be included in the BoQ





Yes




The area is served by a main road which is largely uncongested outside of morning and evening rush hour.


Not required

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None


No constraints.






No


All equipment and materials etc. will be specified in terms of functional requirements only


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2. EARTHWORKS


No bulk earthworks required.


Yes. Details of quality of material for imported backfill are provided for in the specifications.

3. PIPELAYING




Geotechnical investigations identified no areas of rock along this pipeline route. Most of the pipe length is installed as a replacement of an existing pipe with matching invert levels.

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Deep trenches (>2m) are required for various sections of sewer line. Shoring of these will be required whenever people must enter the trench to work.


Groundwater is expected to be encountered in the deeper sewer lines and especially in the months just following rainy season but only at depths >1m. Working uphill in trench excavations will be sufficient to keep them dewatered.


None


No rock was encountered during geotechnical investigations.


Rock is not expected but blasting would not be allowed in these built up areas.

Specifications to include acceptable rock breaking measures

4. STRUCTURES


No structures


No constraints

5. MECHANICAL


Not applicable

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None


Not applicable


Not applicable

6. ELECTRICAL


Not applicable


Not applicable


Not applicable


Not applicable

7. BUILDINGS


Not applicable


Not applicable

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8.1. Is public access disrupted? There are numerous road crossings and along the pipe route.

Specifications will limit the length of open trench allowed to minimise disruption to traffic but there will be areas cut off from vehicle access.

Diversions will and alternate routes will be required where public roads are to be cut.










9. SHUTDOWNS


No. Over-pumping will be put in place to handle sewage flows during pipe replacement.


The tie in of the sewer to the Kaunda Square ponds will need to be co-ordinated with that contractor.

10. RESETTLEMENT



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The RCOI has been defined and some properties encroaching on the pipeline shall need to be removed to allow for the construction of the pipeline.


Impact has been minimised by specifying a narrow (3.5m) available working corridor.

One length of pipe has been realigned to minimise interference with existing properties


No, some areas shall require buildings, and walls which are in the road wayleaves to be removed to allow for the construction of the pipelines


11. ENVIRONMENTAL


Major arisings will be earth, and building rubble. The former can be disposed of on site or in borrow pits whilst the latter can be incorporated into site filling.

Old pipe materials are to be excavated. These will be sewage contaminated and will need to be disposed of in landfill.



Old sewage pipes will need to be properly disposed of in landfill.



Pipelaying in deep trenches will require shoring of the trenches.

Geotechnical investigations indicate stable trenching conditions

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TU-5 & TE-3- Constructability Checklist


1. GENERAL




1.1.3. Disposal of waste materials Non soil waste to be disposed in council designated waste dumps

Topsoil and unsuitable materials that cannot be disposed of on site shall be disposed of in gravel material borrow pits

1.2. Are the necessary skilled personnel available in the local market and where necessary will the contractor be able to bring in staff from outside the country.

Required trades are available within Zambia. Immigration rules allow for management staff and staff with specialist skills to be brought from outside the country.

1.3. Do the works require the importation of any high value items of specialist plant. If so have alternatives that eliminate this need been considered?

A floating dredge is required which will form part of LWSCs future maintenance equipment to allow de-silting of other ponds and as such is essential.


Inter-pond connecting pipe materials, pond liner, reinforcement will need to be stockpiled at the contractor’s yard and delivered to site at time of installation to prevent issues of theft/ vandalism.

Earthworks materials and special bedding materials may be delivered directly to the point of use.


Space exists on the site for stockpiling of materials

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1.6. Are utility locations accurately defined No utility locations


1.7.1. Are personnel work areas easily accessible


1.7.2. Is there access for excavation plant


1.7.3. Is there access for haulage trucks to all areas they need to dump


1.7.4. Are there traffic restrictions or congestion issues affecting site access

None

1.7.5. Are there measures available such as opening up temporary access routes that would considerably improve constructability

Yes, divert the main road leading to the Kwamwena Housing Estate and Mutumbi Cemetery

1.8. Will weather become a factor for the successful completion of the job

Excavations and backfilling operations become an issue in the heavy rainfall months of December to March



1.9.1. Are there non standard or complex methods of construction and could any of these be simplified

No. Standard construction methods used throughout.

1.9.2. Has construction sequencing been considered in the design

Yes. Construction of Extension area will be completed before works commence on the upgrade area, minimising flow diversion.

A by-pass line is designed as a permanent feature of the new pond system.

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No non standard specification provisions or tolerances have been introduced.


1.10.2. Have new items been introduced in the specifications/ method of measurement where standard items might suffice

No. BoQ preparation is by different staff to design preparation. Designers are only called on to provide new specification or MoM items where those preparing BoQs cannot find applicable standard items


Restricting the source of pumps was considered but has been rejected based on comments from the Client. All pumps will be specified in terms of functional requirements only.

Manufacturer’s names, where used in the specifications or drawings, are always suffixed ‘or equal’ to remove restriction whilst placing the emphasis on the Contractor to demonstrate equality.

1.11. Are pay items in the bid tabulation apparent in the specifications and in the drawings

A standard specification and method of measurement is used (CESMM) and new items only introduced where the work items are not covered by the standard.

Drawings need to contain cross references to pay items.



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1.12. Are materials purchasing requirements simple to accurately extract from the Bill of Quantities

CESMM bills use separate ‘supply’ and ‘install’ items for pipes and fittings.



Ensure all items of mechanical and electrical equipment are uniquely referenced in drawings, specifications and BoQ.


2. EARTHWORKS

2.1. Has the design been earthworks balanced to reduce the need for imported materials

No, because of trying to utilise the existing foot print.

2.2. Where imported materials are required is the specification appropriate to the requirement.

Yes

3. PIPELAYING

3.1. Have the materials through which trenches are to be excavated been properly categorised


3.2. Have any potential areas of ‘hard’ or intermediate excavation been identified and have sufficient quantities of such excavation been allowed for in the BoQ

One area of ‘intermediate’ material has been identified and BoQ provision has been made


3.3. Is groundwater likely to be encountered in any excavations

Yes, as was observed during the geotechnical investigations stage.

3.4. Is specialist equipment required and if so have alternatives been considered to eliminate the need for it.

Electrofusion equipment is required for lining jointing. The equipment is specialist but relatively inexpensive and justified by the improved final product.

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3.5. Is rock likely to be encountered and has provision been made in the designs

Non was encountered during geotechnical investigations

3.6. Is rock blasting possible or are alternative measures for rock removal required

No

4. STRUCTURES

4.1. Are founding conditions suited to the structure foundation design

Yes

4.2. Is sufficient working space available for structural works

No constraints

5. MECHANICAL

6. ELECTRICAL


IEE standards used

7. BUILDINGS

7.1. Are building materials specified readily available


7.2. Are founding conditions suited to the building foundation design



8.1. Is public access disrupted? Yes, an alternative route will be provided and maintained according to stated regulations.

8.2. Has access disruption to local businesses been considered

Yes

8.3. Has provision been made to ensure local people have access to their properties

Yes Land requisition issues are still on- going

8.4. Is there provision for a traffic management plan

Not applicable

9. RESETTLEMENT

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Detailed topo survey has picked up all structures within the proposed land area

9.2. Where the need for resettlement has been identified have design change options been considered to eliminate or reduce resettlement needs

Resttlement needs have been minimised but significant land take is still required.

9.3. Is sufficient space available for working without disruption to buildings and walls

Yes.

10. ENVIRONMENTAL

10.1. Have construction waste materials been identified and disposal methods specified

Major waste materials will be earth and rubble from existing concrete works. The former can be disposed of in borrow pits whilst the latter can be incorporated into embankment filling.


10.2. Are any hazardous wastes expected and are safe disposal methods/ procedures specified.

Some sewage sludge will arise which will have to be taken to a licensed landfill site



11.1. As designed, do the construction methods have any intrinsic safety issues? Have these been addressed in the specification.

Some desludging works need to be carried out on the existing ponds. Sludge handling from the ponds needs special attention as it will be packed in plastics and then disposed of to a designated waste disposal site.

Excavations are about 5 m deep. Geotechnical investigations indicate stable soil and maintaining a side slope of 1:2.


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11.2. Are National Health and Safety regulations sufficiently rigorous when compared to international best practice or should additional HS clauses be included.


TU-5 & TE-3- Constructability Checklist 2 – Function


12. GENERAL



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Lu

saka W

ate

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pp

ly, S

an

itatio

n a

nd

Dra

inag

e (L

WS

SD

) Pro

ject

Deta

iled E

ng

ine

erin

g D

esig

n, T

ender D

ocum

ents

, Deta

iled E

SIA

s a

nd

ES

MP

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r Wate

r Supp

ly a

nd S

an

itatio

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Constru

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Re

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Ann

ex

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re

AN

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An

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Work

Pro

gra

mm

es

(8 p

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IDTask N

ame

Duration

47S

tream 1 and 2 Parallel O

peration1 day?

JF

MA

MJ

JA

SO

ND

JF

MA

MJ

JA

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ND

JF

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Half 1

2013H

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Half 1

2014H

alf 2 2014

Half 1

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Task

Progress

Milestone

Sum

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Rolled U

p Task

Rolled U

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Split

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Project Sum

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Group B

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Deadline

Page 2

Project: CP

4-Programm

e.mpp

Date: Fri 09/11/12

Constructability R

eport A

nnex II - Work P

rograms

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