contents page

TECHNICAL SUBMISSION SECTION C – PART 2A PROJECT SPECIFIC REQUIREMENT

IA 2017 C 038 I C821/2 - Construction of Foul Sewer for

C2A/Contents(1) October 2017

Various Catchment Within Doha West (Package-2)

CONTENTS PAGE

1. : Project Brief C2A/1

2. : Scope of Works C2A/3

3. : Time for Completion C2A/5

4. : Technical Regulations for Over pumping C2A/6

5. : Roads Diversion and Closure Policy C2A/6

6. : Interfaces C2A/6

7. : Phasing C2A/7

8. : On-the-Job Training at Contractor’s Premises C2A/10

9 : Trade Embargo C2A/11


IA 2017 C 038 I C821/2 - Construction of Foul Sewer for Various Catchment Within Doha West (Package-2)

C2A/1 October 2017

1. Project Brief

The project, C821/2 – Construction of Foul Sewer for various Catchment within Doha

West (Package-2) is developed from original DW068 project under Local Roads and

Drainage Program (LR&DP). The project area is on the western periphery of Doha covers

in Zone 54 of Administrative setups for Municipalities & Zones. The project area is

bordered by Al Rayyan Al Jadeed Road on the North, Al Furousiya Street on the West

and Northwest, Al Bustan Road and the Doha Expressway in the East and Al Waab

streets in the South. The catchment area of project covers 375 ha of land area. The

project area and location map is shown in Figure 1.

Figure 1: Project Location Map

The Project area consists of the following project boundary catchment as shown in Figure

2. The catchments are mostly developed (90% -95%) and currently being served by the

existing foul sewer networks connected to the PS 37and PS 34.

The project area is generally low-density and low rise residential area, consisting of single

family units and supported by religious, educational and commercial facilities. The foul

sewer system will extend the existing network so as to obtain 100% coverage. This would



C2A/2 October 2017

serve future connections from all currently un-built plots as well as existing plots where

the network is absent. The downstream mains of the foul network in project area are

interfacing with the proposed expressways corridors.

Figure 2: C821/2 - Project Catchment Boundary

There are pockets of areas within these catchments, where no connected sewerage

services available; and also some of the existing sewers are undersized/surcharging.

Therefore, to overcome these problems/issues the adequate network is designed under

LRDP programme and being proposed for developed as capital project.



C2A/3 October 2017

The main objectives of this Project are as follows:-

(a) Construction of new foul sewer network where there are no connected foul sewer

services available.

(b) Integrate the new sewer network with the existing foul sewer network, which may

require upgrading of the existing sewers.

(c) Upgrade the existing undersized/surcharging sewers.

(d) Provide House Connection along the newly constructed sewers.

The detailed design of the foul sewer network, Topo Survey, Soil Investigation works (SI)

and the House Connection (HC) Survey for the above sub-catchments were carried out

under the LR&DP Project DW 068. The respective reports are provided in Section-E of

this tender document.

2. Scope of Works

This project consists of new and upgraded foul sewerage collection system in Muraikh, as

part of the sewage infrastructure program for Rayyan Municipality within Doha. The

purpose of the project is to serve existing and planned developments in the area, and to

upgrade the existing sewerage facilities.

The proposed scheme comprises construction of foul sewer network with open trench

method (OTM) as well as Non Destructive Method (NDM). The pipe sizes varies from

200mm to 500mm in open trenches and 600mm proposed in NDM. The project consist of

construction of manholes for shallow and deep depth for varies sizes from 1500mm to

2400mm. Also, the project work includes construction of necessary house connections for

proposed as well as existing network for developed and undeveloped plots.

The brief description of works to be carried out is as below;

a) Construction of Sewer Networks in open trenches for approx. 9,616 m length

by open cut method.



C2A/4 October 2017

b) Construction of Sewer Networks in trenchless of approx. 1,956 m length by

NDM method.

c) Construction of in situ concrete manholes of appx. 270 numbers.

d) Construction of house connections of appx. 693 numbers.

However, the principal elements of the Works to be carried out are listed below, the

Project Scope shall include, but not limited to the following;

a. Mobilisation and setting out work.

b. Demolition and Site Clearance – Includes breaking of existing septic tanks and

disposal off site.

c. Alterations of existing Sewer mains. Demolish and remove existing sewer lines in

accordance with drawings.

d. Obtaining necessary Authority approvals prior to the construction and after

completion of project works.

e. Sewers in Trench by open-cut. Vitrified Clay (VC) pipe, various sizes and depth,

pipework in trenches with spigot and socket joint, excavation in all types of

material including rock, dewatering, warning tape; all as per drawings and

specifications.

f. Construction of Gravity Sewers of various sizes by Non-destructive Method

(NDM)/Microtunnelling method.

g. Manholes of various sizes, depths, and types, and pipework Ancillaries. In-situ

Concrete Manholes including heavy duty DI cover; excavation in all types of

material including rock.

h. Abandoning existing manholes as per specifications and engineer’s instruction.

i. Carryout property house connection survey for existing as well as new plots.

Provide property House Connections of various types, and inspection chambers.

j. Integrating existing sewer network with proposed network. Over-pumping,

temporary utility diversion, traffic diversion as necessary.

k. Reinstatement - breaking up, temporary and permanent reinstatement of roads,

footpaths, and land.

l. Other Pipework ancillaries - Connecting to existing/proposed manholes,

connecting to existing pipe, Marker posts etc.



C2A/5 October 2017

m. Locating existing utilities and coordinating with respective Utility Companies for

Sewer crossings to avoid potential conflicts. Contractor shall perform the work in

compliance with QCS 2014 and Utility Companies requirements. The combined

utility services drawing report is provided with Section E, Part-6.

n. Preparation of as-built drawings. Any other relevant work which are deemed

necessary for the successful completion of the project.

o. Testing & handing over the completed works to Public Works Authority (PWA).

Project close out.

3. Time for Completion

The Contractor shall complete these works within One Thousand and Ninety Five

(1095) Calendar Days from the Commencement Date (CD) of the Contract as follows:

Key

Stage

Description Of Works

Time For Completion

Start date

[Commencement

Date (CD)]

Completion Date

[started in no. of days

from Commencement

Date]

A Mobilisation, Setting out &

Approvals (RO Permit etc.),

Construction of the Foul

Sewer Network, Testing,

Handing Over and Project

Close-out.

CD CD+ 1095 Days

4. Technical Regulations for Over Pumping

The contractor shall follow technical regulations for over pumping as per QCS 2014. The

contractor shall investigate the source of sewage, provide over pumping layout

arrangement, pump selection, stopper selection, Safety precautions in live sewer, and

notice to local residents.



C2A/6 October 2017

5. Roads Diversion and Closure Policy

The bidder shall adapt road diversion and closure policy document published by Ashghal

and QCS 2014, section 1, part-16. The documents outlines the process and workflow

from the moment a road diversion/closure is approved by the traffic department, to the

moment the announcement is published in the newspapers.

Contractor shall inform to PR department about ALL road closures and diversions as

soon as they’re approved. The PR department will determine the optimum

communication channel(s) to reach affected communities.

6. Interfaces

The Contractor shall note that there are several design interfaces with the neighboring

PWA projects, especially with the Expressway project P029-C1. The proposed foul sewer

network in project C821/2 ultimately discharges into the downstream foul sewer network

designed in P029-C1.

In order to avoid excessive temporary overpumping during the foul sewer construction

works, the Contractor of C821/2 shall closely coordinate with the Contractor of the

Expressway project P029-C1 and propose a comprehensive programme and construction

strategy of the proposed foul sewer network in project C821/2, considering the

construction schedule of both works.

This coordination shall begin at the earliest possible stage upon award of contract to

ensure that the construction interfaces and phasing are mutually agreed between the

parties and approved by PWA. The following table shows list of projects having interfaces

with C821/2.



C2A/7 October 2017

Table 1 – Interface with Other Projects

Project Status

P029-C1, C821,

C821/3, C821/4

These projects are likely to be constructed during the same period as

that of C821/2, liaison required with the Contractors of these projects.

7. Phasing

The project construction works is split in two phases as indicated in Figure below. The

contractor shall provide detailed construction programme of Phase-1 and Phase-2, and

coordinate with ongoing surrounding projects. Phase-1 is subdivided into Segment-A and

Segment-B based on method of construction. Segment-A consists of microtunneling

works, and, Segment-B consist of open cut trench works.

A separate programme for Segment-A and Segment-B works shall be provided, which

shall be fitted in overall programme of Phase-1 & Phsae-2 limiting to timeline mentioned

above in section 1.3. The contractor shall commence the installation of works in both

phases simultaneously.

The Contractor shall commence Segment-A incoordination with P29-C1 timelines, to

have smooth interface programme without leaving dead ends, and complete the works in

stipulated timeframe. Commencement of works in Segment-B shall be aligned with

completion of main trunk foul sewer line in Segment-A. Segment-A shall be completed

before start of Segment -B. The contractor shall achieve completion of works within the

schedule. The Contractor shall mobilize and obtain all the permits within 90 days, before

commencing work on the site.



C2A/8 October 2017

Figure 3: Adjacent Projects



C2A/9 October 2017

Figure 4: Phasing Layout



C2A/10 October 2017

8. On-The-Job Training at Contractors' Premises

8.1 As part of the development of assigned PWA personnel, and as a separate

requirement to the specific needs of the Project, PWA requires the placement of

suitably qualified personnel at the Contractor’s premises on an attachment basis

within the Contractor’s organisation at different stages of Project execution for the

purpose of knowledge and skills development through on-the-job training. The

Contractor is expected to provide all necessary support for this work experience

by attaching said Engineers/Employees with Contractor’s relevant discipline

section. This program may include PWA personnel being assigned to engineering

disciplines, such that the placements receive training in all applicable/relevant

areas during the Project development.

8.2 The potential placements will be PWA Qatari Engineers/Employees and would

be fully integrated into the Contractor’s organisation working on the Project.

8.3 The Contractor shall identify a training coordinator/coach at senior engineer level

and provide office space, computers and relevant Project software. A Training

program shall be developed for each placement to include the proposed training

by the Contractor and their particular requirements. The Contractor shall fully

monitor the placements’ training program and carry out regular assessments with

each placement and provide these assessments as part of regular progress

reports regarding training progress to the PWA focal point of contact.

8.4 PWA Qatari Engineers/Employees will undergo on-the-job training in relevant

job roles. Training will focus on awareness, knowledge and skills level as

applicable. Technical competence level to be achieved should be set at

“supervised practitioner”.

8.5 Within one month of the Commencement Date, the Contractor shall provide

Training Plan covering details of the most suitable areas of the Project that would

provide the most benefit to the placements, provide details of the programs that

will be available within their organisation and a matrix showing proposed

placement positions and durations to PWA for review and approval. The

Contractor shall implement continuous assessment and evaluation for PWA

personnel assigned to training and provide detailed final report.

8.6 The Contractor’s scope includes training a number of Qatari Engineers

Employees for a duration of 1 - 3 months each on-site, at the Contractor’s

premises. Actual number to be agreed mutually upon request.

8.7 The Contractor shall provide on-the-job training locally/overseas on the

Contractor’s premises in accordance to the relevant clause of General Conditions

of Contract.



C2A/11 October 2017

8.8 Where on-the-job training is provided overseas, PWA shall bear all staff expenses

such as (air ticket, food, transportation & accommodation).

9.0 TRADE EMBARGO

In the event the Contractor is unable to source and acquire materials and

equipment from countries stated *in the approved manufacturers / supplier /

vendor list due to embargo, the Contractor shall source and acquire equivalent

materials and equipment from other alternative countries accordingly if required

without additional cost incurred to PWA.

contents page

Documents