Melamchi water supply project includes
mainly of 2 components, i.e. infrastructure
development and social and environmental
support. Hence as a Project Engineer,
the role of DSC is to supervise all
activities running under these components
while implementation of different
project activities.
Infrastructure development mainly
refers the construction of Melamchi
Diversion Scheme (MDS) and water treatment
plant (WTP) so there are different
DSCs in order to monitor the MDS activities
and the WTP.
DSCs Scope of
Work for MDS
MDS includes diversion weir, intake,
settling basins, river training works
and about 26.5 km of diversion tunnel,
and a short pipeline from the downstream
portal to the water treatment plant.
The Consultant shall act in capacity
as the “Engineer” and represent the
Client in the tunnel contract that
is based on the FIDIC "Condition
of Contract for Construction for Building
and Engineering Works (Designed by
the Client), Multi Lateral Development
Bank Harmonised Edition March 2006”.
The Engineer shall have the full responsibility
for the professional quality and sufficiency
of the supervision with respect to
progress, quality of materials and
work, measurements of quantities,
costs, and legal aspects related to
the contracts.
In addition to the supervision tasks
defined above, the Consultant shall
also carry out the detailed design
based on the tender design.
DSC shall furthermore provide intermittent
inputs in the evaluation of bids as
well as contract negotiations. The
Consultant shall also develop a comprehensive
“Project Construction Supervision
Manual” within 2 months of the commencement
of the supervision services. More
systematically DSCs task and responsibility
can be described as:
I. Overall Design and Supervision
Detailed Design - The detailed design
has to be developed into a detailed
design which requires completely defining
of the content of the tunnel contract
package. To define the necessary works
for the detailed design documents,
a design review is be performed at
the start of the design works. This
design review shall enable the DSC
to adopt previous design phases. A
respective design review report will
be worked out which reviews, checks
and comments the previous design phases
as well as define necessary additional
work for the detailed design.
Supervision -The supervision service
covers the tunnel contract (Contract
No. -MDS/DT/01), comprising the following
main components:
 |
Construction
camps at Ambathan, Gyalthum,
Sindhu and Melamchi Pul Bazar,
including water supply, sanitation,
etc., |
|
Adits at Ambathan, Gyalthum
and Sindhu, tunnel 12.7m2 to
18.4 m² cross sectional area
and length approx. 26 km, chainage
0+000 to 26+500 |
|
Tunnel flushing system at
Ambathan adit |
|
Headworks and river training
and intake at Ribarma with de-sanding
basin. |
|
Headworks hydraulic steelwork
supply and construction. |
|
Construction camp at Sundarijal,
including water supply, sanitation,
etc., |
|
Pipeline of diameter 1.6
m from tunnel portal to WTP,
length 255m |
|
Gate valve arrangement at
portal and spillway/bypass flushing
system to Bagmati River, other
control works at downstream
and Portal at Sundarijal |
|
Maintance of access roads. |
Other important components to be
supervised are:
|
Spoil tips and
quarries |
|
Environmental management and
|
|
Maintenance of existing roads. |
The tunnel contract will interface
additionally with:
|
Access roads:
All access roads to be usable
when the tunnel contracts become
effective |
|
Social Uplift Program (SUP).
There is a simultaneously implemented
Social Uplift Program which is
part of the Melamchi Water Supply
Project. |
II. Specific Task for Tunnel Construction
The Consultant shall provide at the
approval of the client a suitably
qualified and experienced senior engineer
familiar with the scope of the Works
to assist the MWSDB in the procurement
of the Tunnel Construction Contract
and evaluation of the tenders. The
Consultant shall attend such meetings
and review the available documentation
necessary to allow them to provide
advice to the client on the selection
of the tunnel construction contractor.
Where practical staff involved in
the evaluation of the tenders shall
also be assigned to the Consultant’s
ongoing services for continuity. The
design of the tunnel contract works,
including the headworks, has been
developed sufficiently for tendering.
The Consultant shall review the tender
drawings and the Final Design Study
Reports previously prepared and satisfy
themselves the extent to which the
Works are defined. Following this
review the Consultant shall prepare
a “Tender Design Review Report”. Following
review and approval by the client
the Consultant shall undertake detailed
design, interpret and expand on or
modify existing designs/drawings as
required and check and approve working
drawings and shop drawings prepared
by the Contractor or suppliers.
I. Work Program: Critically review
the contractor’s work program in relation
to the targeted completion date and
to ensure that it realistically reflects
the available resources. Take measures
as the Engineer to maintain the programme
in accordance with the clients’ project
programme and requirements.
II. Discrepancies and Omissions:
In consultation with Client and the
Contractor as required, resolve discrepancies
and omissions in the contract documents.
III. Inspection of Goods: Inspect
goods upon arrival and control test
certificates provided by the contractors/suppliers,
supervise and/or carry out tests as
required.
IV. Ongoing Construction Inspection:
Carry out the daily inspection of
construction work with respect to
adherence to the contract conditions
including environmental measures.
The inspection will include quality
control (using appropriate report
formats, and field and laboratory
test forms), work measurements, record
keeping and daily progress.
V. Environment protection clauses
are included in the Construction Contract
Documents. The Consultant will monitor
the Contractor’s implementation of
such environment protection clauses,
will issue field instructions as necessary,
and will monitor the implementation
of such field instructions.
VI. Tunnel Headings – Ground Conditions:
Provide for observation and monitoring
of on-going tunnel conditions during
construction at all headings with
respect to integrity of the rock for
the purpose of determining timely
and efficient application of the temporary
and permanent system for the advance
on each tunnel face. The Consultant's
Geotechnical Engineer will lead the
rock face mapping task jointly with
the contractors Geotechnical Staff.
The contractor will perform the mapping
and propose lining details accordingly.
The Contractor shall be responsible
for the design, nomination on site
and installation of initial support
to excavations to ensure the safety
and temporary stability for the duration
of the Contract. The Contractor shall
inspect excavation surfaces jointly
with the Engineer as soon as practicable
after each blasting round.
VII. Tunnel Support Design: The tender
drawings for the tunnel contract provide
indicative details of design for different
classes of ground conditions and different
support systems. The Contractor shall
propose and the Engineer shall review
and approve as appropriate the selection
of the initial (temporary) ground
support to be applied to the excavated
tunnels. In situations where the Engineer
and Contractor do not agree on the
selected lining detail, the Engineer's
opinion shall prevail, and the Contractor
shall proceed to install the lining
accordingly. The Consultant shall
be responsible for the design and
nomination on Site of the permanent
support to excavations which the Contractor
shall supply and install.
VIII. Site Meetings: The Consultant
shall lead regular site meetings and
prepare the minutes from such meetings
(based on a standardized format),
proactively manage the execution of
agreed actions.
IX. Measured Work: Works requiring
measurements shall be measured by
the Contractor with supervision of
the Consultant. Work completed shall
be clearly indicated on “As Built
Drawing” maintained by the Consultant
and up dated monthly as a record of
work done.
X. Variations and Claims: Issue variation
orders as required. The Consultant
shall obtain prior approval of the
Client before taking any actions under
relevant Clauses of the Civil Works
Conditions of Contract. The Consultant’s
authority and delegated responsibilities
will be advised in writing to the
Consultant and copied to the Contractor
before the commencement of the Tunnel
Contract. The Consultant shall examine
and assess the claims and time extension
requests of the contractors and recommend
his findings to the Client. In the
event of any arbitration or litigation
procedures, provide assistance to
the Board of Arbitration or Court
of Law, if so requested by the Client.
XI. Payments to Contractor: Check
payment claims, guarantees, performance
bonds, and all other required documentation
against the contract, including the
monthly progress payment claims submitted
by each contractor. Certify payment
of such amount of the claim as is
adequately documented and supported
in accordance with the contract.
XII. Coordination with Other Contracts:
Support the coordination of the interface
between the tunnel contract and others
and together with the Engineer of
any other contracts (water treatment
plant, access roads EMP and SUP activities),
support necessary co-ordination between
these contracts.
XIII. Communication with the Client,
Monthly Meetings: Besides regular
contacts, the Consultant shall inform
and consult with the designated representative
of the Client without delay in case
of major events threatening in the
successful and timely completion of
the works. The Consultant shall participate
in monthly progress/coordination meetings
with the PMU to be held in Kathmandu
and make a short presentation on progress,
problems, remedial action proposed,
interface issues, and any other matters
that should be considered by the meeting.
The Consultant will also provide timely
component information for project
use in the MIS format established
by the PMU. Submittals and reports
will be generally forwarded to project
headquarters both hard copy and electronic
media.
XIV. Taking-Over: To carry out inspection
and report to the Client prior to
formal taking – over all or part of
the works and issue defects corrections
notice as required. Participate in
final joint inspection and issue Taking–Over
Certificate.
XV. Defects Notification Period:
During Defects Notification Period,
one year for civil works, to provide
intermittent inputs to inspection
and report on condition and defects.
III Specific Tasks – Cost Control
|
Account of Expenditures:
The Consultant shall provide monthly
detailed records and summaries
of costs certified to date for
the tunnel contract in tabular
and graphical format.. |
|
Tunnel Support and Lining System:
Tunnel support and lining system
shall be proposed by the Contractor
and approved by the Consultant.
To reflect some expected variation
in geotechnical conditions the
costs shall be changed accordingly. |
|
Final Measurements of Works:
The final works are subject to
final measurement under the terms
of contract. |
|
Variations: The Consultant
shall issue variation orders as
required, but is required to obtain
prior approval of the Client for
any variation before taking any
action under relevant Clauses
of the tunnel contract. |
|
Claims: The Consultant shall
number and classify each claim
and time extension requests of
the Contractors and recommend
his findings to the Client. In
the event of any arbitration or
litigation procedures, the Consultant
shall provide assistance to the
Board of Arbitration or Court
of Law, if so requested by the
Client. |
IV Training
The key training program delivered
under this contract by the Consultant
is to be specifically focused on tunnel
construction supervising issues. It
is envisaged that the training program
will be carried out early in the contract
period primarily for the benefit of
the MWSDB staff.
Training should be implemented focusing
on the following parameters:
|
Training course
shall be organised in two two-week
sessions; 1st session shall cover
Modules 1-4, and 2nd sessions
Modules 5-9 |
|
1st session should preferably
be arranged already before the
starting of the project implementation
because it is important that the
Client’s staff is aware of the
contractual procedures in early
stages of the project. |
|
2nd session should start two-to-three
months from the starting of the
project implementation |
|
Training Program shall be held
in agreed location in Kathmandu
or Melamchi Pul Bazaar. |
|
The desired number of participants
is less than fifteen persons |
|
Training Program in Kathmandu
will be conducted by the Consultant’s
expatriate and local professionals |
V Other Training
|
On-the-job training
will be arranged for the Client’s
counterpart staff throughout the
project implementation. So called
“Saturday sessions” will be organized
in special topics when the need
comes. Consultant’s experts will
give lectures in special topics
related to tunneling works to
the Client’s staff. |
|
Other training activities will
be developed during the course
of the project depending on the
type of training considered essential
and beneficial for the implementation
of the Melamchi Diversion Tunnel. |
The DSC consultant is the Consortium
of POYRY Infra AG, POYRY Environment
Oy, POYRY Infra Oy and HIFAB International
in association with Multi Disciplinary
Consultants (P). Ltd, Nepal.
For further information please
contact:
Poyry Infra AG
Hardturmstrasse 161, P.O. Box
CH-8037 Zurich, Switzerland
Tel/Fax - +41 44 355 55 55/ 355
55 56
http://www.poyry.com
and
Hifab International Ltd.
Rehnsgatan 20
P.O. Box 190 90
SE-104 32 Stockholm
Sweden
Phone: +46 8 546 666 00
+46 8 546 666 00
Fax: +46 8 546 667 80
E-mail: info@hifab.se
Website-http://www.hifab.se
In Association with
MULTI Disciplinary Consultants
(P) Ltd.
P.O. Box 5720
Kathmandu, Nepal
Tel: +9771 5525076 / 5529304
Fax: +9771 5523103
Email: mdc@multinepal.com.np
URL-www.multinepal.com.np
|
