DSC for Construction of Water Treatment Plant -NJS

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 WTP

DSC provides required Engineering services at all stages of the construction of WTP at Sundarijal, Kathmandu. More specifically, the description of work to be performed by DSC can be summarized as follows:

I. Design Phase

A. Review of previous studies and preparation of Inception Report. The Inception Report will include, but not be limited to the following discussions:

Possible alternatives for treatment technology;
Consideration of the optimum phasing of treatment plant expansion and selection of the most appropriate first phase capacity
Alternative options for sludge drying and sludge disposal and
Definition of the ultimate (i.e. after expansion to 510 MDD) footprint of the treatment plant and sludge drying facilities.

The “footprint” is required tin order to allow the Melamchi water Supply Development Board to initiate land acquisition proceedings.

B. Preparation of detail designs and working drawings of plant items and equipments’ including their size and cost major activities are as follows.

Engineering surveys
Soil investigations/Geo-technical investigation. Comprising as a minimum 10 drill-holes to 20 m depth, SPT testing in sands and undisturbed tube sampling in cohesive soils, with classification tests for all soils, and strength and consolidation tests for cohesive soils.
Sesmicity- To establish the design earthquake and determine the relevant design criteria for the Water Treatment Plant structures.
Hydraulic design
Structure design – including structural design for earthquake, and design of flexible joints for paperwork between different structures.
Power supply – Comprising two independent sources of power
Control system – suitable for operation and maintenance by Nepalese operating staff.
Architecture – To minimize the Water Treatment Plant intrusion into the environment.
Preparation of plans and detailed specifications. Preparation of plans and detailed specifications of all civil works and preparation of performance specifications for all electrical and mechanical works.

C. Preparation of operation and management manuals/training manuals

D. Preparation of design report

E. Preparation of pre-qualification Brochure, Questionnaire and Evaluation Criteria and assistance to the Employer with Pre-qualification evaluation.

F. Preparation of Tender Documents including Conditions of Tendering Conditions of Contract (based on internationally used General Conditions of Contract), Technical Specifications and performance Specifications, Drawings and Bills of Quantities.

H. Review of EIA documents.

I. Preparation of required environmental mitigation measures.

Assistance to the Employer in Co-coordinating with other project components including regular liaison with the consultants for the project components upstream and downstream of the Water Treatment Plant. Tender documents will be prepared in A4 format, except the Drawings will be printed on A3 paper for issue to Tenderers. The number of hard copies of Tender Documents provides shall be 20. The consultant will also provide to the Employer an electronic copy of all Tender Documents.

II. Pre-construction Phase

a) Assistance to the Employer in Per-qualification of the constrictors.
b) Assistance to the Employer during the Tender Period, i.e. attending the Tenderers’ site inspection, answering Tenderers’ queries, and issuing addenda to the Documents as required.
c) Assistance to the Employer in evaluation to tenders
d) Assistance to the Employer in negotiation and award of contracts.

III. Construction Phase

Supervision of construction (as per the following breakdown)

i. Preparation of monthly progress reports and bills including checking of the construction works as per specified specifications and atandards
ii. Assistance to the Employer in preparation of quarterly progress report for JBIC
iii. Conduction of workshops and seminars and training for operational staffs for counterparts on the Employer side to transfer technical knowledge
iv. Envrionmental monitoring during construction stage
v. Preparation of completion report.

IV. Breakdown for Construction Supervision

a. Setting-out of the Works

Before the commencement of construction, the Consultants shall provide to the Contractors all necessary information required for initial setting-out of construction works. The consultants shall also supervise the setting-out survey to be carried out by the Contractor.

b. Construction Drawings and Documents

Throughout the course of construction works, the Consultants shall provide all necessary construction drawings including bar bending schedule to the working details, including revision of designs as many be necessary due to geological conditions and other unforeseen conditions.

The Consultants shall clarify and/or supplement information in drawing and related documents in case any ambiguities arise during the course of construction works.

c. Check of the Contractor’s drawing and Documents

The Contractors/suppliers will furnish various working/manufacturing designs and drawings for approval. The Consultants shall review and check the proposals, designs, working drawings/shop drawings, and other documents submitted by the Contractors. The review and check shall cover, but will not be limited to the following points:

Adequacy of the contractor’s proposals and soundness of the design involved,
Adequacy of the proposed construction plan and time schedule
Adequacy of the type of proposed construction equipment, quality of construction materials to be sued and
Adequacy of proposed construction operation and temporary works including their structural/operation safety and environment effects to surrounding areas.


d. Check of Construction plan and Work Schedule

The Consultants shall review the appropriateness of construction programs proposed by the Contractors and adjust them as required, particularly in case there are any discrepancies and/or conflicts among the programs, submitted from the different Contractors. The consultants shall recommend to the Employer the change of programs, in case it is found necessary and beneficial to WTP Project.

e. Quantity and Quality Control

The Consultants shall assist the Employer in checking the quantities of the Works accomplished by the Contractors and keeping them in record so that the measurement for payment can be properly done at the end of each measurement/payment period. In any case, the consultant shall control the quality of construction works as per specified specifications and standards.
f. Monitoring and Control of Works Progress
The Consultants shall update and keep in custody a “Master Schedule” for checking and controlling the contractor’ work progress throughout the construction period.

The Consultants shall attend a weekly meeting separately held between he representatives of the Employer and the Contractors. At the meeting, work schedule and operation programs are discussed so that the works can be carried out most efficiently. Whenever any delay is observed in the actual progress of the works, the Consultants shall advice due remedial measures to the Employer.

V. Manning and Schedule

To implement this consultancy effectively, the Consultant shall open and maintain a full-time office in Kathmandu, with during the construction phase, a site office at the Water Treatment Plant site.

Staffing shall include, but not be limited to the following expertise

Structural design
Architectural design
Water treatment process design
Water Treatment equipment and controls
Power Supply
Tender documents preparation
Tender evaluation
Contract management
Construction supervision

The Consultant shall provide a design phase work plan and an overall manning schedule.

VI. Reporting

During the consultancy, the Consultant will submit the following reports

Design Phase

Inception Report after months,
Design Criteria Report after 3 months, outlining the basis for the future design
Draft Design Report after 10 months
Final Design Report after 12 months (at the end of the design phase) reporting on the completed design, including any variations of design criteria used
Progress Reports, monthly and quarterly for JBIC

Construction Phase

Progress and Payment Certification Reports, monthly
Quarterly progress Report for JBIC on behalf of the Employer
Project Completion Report, describing construction methods, discussing variations from the design with reasons, and including the operations and maintenance manuals and work-as-executed drawings as per JBIC Guidelines.

For further information regarding Design and Supervision Consultant (DSC) for Water Treatment Plant contact:

Nippon Jogesuido Sekkei Co., Ltd.
International Division
9-15, Kaigan 1-chome, Minato-ku
Tokyo 105-0022
Telephone- 81-3-3432-8875
Facsimile – 81-3-3432-8907
Email – njs@mb.infoweb.ne.jp

In association with

Binnie Black & Veatch (International) Ltd.
Mott MacDonald International Ltd.
Nepalconsult (P) Ltd.