Norwegian Church Aid South Sudan Careers

Norwegian Church Aid Geophysical Survey in Gumuruk, Greater Pibor, Boma State South Sudan Careers

Geophysical Survey in Gumuruk, Greater Pibor, Boma State Republic of South Sudan.

Terms of reference

· Background information

· The NCA – South Sudan is in the process of developing a ground water based small water supply system. The project entails the drilling of 6 high yielding deep boreholes. One of these will be equipped with a solar power pumping system and the rest will be fitted with India Mk2 hand-pumps.

· There exists surface water in the area but this water flows between the months of June – February. This water is however highly turbid and unsuitable for human consumption. Anecdotal information suggested that there are a number of perennial shallow ground water sources which continue to provide water throughout the year but they un-improved and are situated further away from the main center.

There is an emergency surface water treatment plant that is run by NCA but the cost for running this system is high and also this system only runs where the water flows in the river, during dry months, the community has no access to water ( March – May ). There are also about 10 shallow boreholes (less than 80 meters deep) but these yield very little water and often dry up in the middle of the dry season.

· The water from the successful high yielding boreholes will be pumped to an overhead tank and then reticulated through new mainlines to be developed to 5 key areas within the main settlement center within a radius of 800 meters from the storage tank. The water supply will likely be the only source of water for approximately 30,000 people within Gukuruk area.

In addition, provision will be made for supplying water to a school and a hospital run by MSF in the area. Previous attempts to drill boreholes in the areas has proved futile necessitating the need to carry out extensive hydrogeological and geophysical surveys to ascertain areas of great potential for the drilling of boreholes for the planned ground water based water supply system.

· This Request for Proposals (RFP) document is intended to lead to identification of a consultant to undertake a hydrological survey for the project and this document constitutes the formal Request for Proposals (RFP) and is being availed to bidders to provide additional information to bidders to assist to prepare bids.

· contract PURPOSE and Expected results

Overall objective:

· The goal of the consultancy is to identify zones with good potential for fresh, safe and sufficient ground water sources that can be developed through deep borehole drilling to use for a water supply at Gumuruk that is reliable and of sufficient capacity to provide the primary source of water supply to the residents and institutions in Gumuruk Center.

Purpose:

· The purpose of this survey is to investigate possible lateral freshwater recharge within the environs and make recommendations on well fields and aquifers that may be considered to explore as an alternative water supply. The proposed survey will; therefore, go along in ensuring the suitability of the area for the ground water potential in order to drill 6 boreholes in the area. In addition, the consultant will be required to submit comprehensive reports and facilitate the supervision of drilling works for the possible boreholes.

To liaise with community members and stake holders to identify locations and sites that are suitable. This will be through public participation and consultation.

Results to be achieved by the Engineer:

Carry out Geophysical investigations to determine 6 locations on the ground (marked with wooden pegs) representing locations of highest potential for ground water for drilling.

Prepare a detailed geophysical report with all the resistivity data and other information obtained from secondary sources which forms the basis of the recommendations of the report.

Clear recommendations for potential for fresh and sufficient ground water, strata expected and drilling methods to be used, water struck level, main aquifer region, maximum depth of borehole, recommended open and cased diameter, screen setting and intervals, recommended pump setting and safe water abstraction rate.

Financial proposals for borehole drilling

supervision services.

· Scope of the Services

The Consultant is expected to use both primary and secondary data in the exercise to ascertain ground water potential. Secondary data will involve desk study of available information/data on existing boreholes, drill logs, reports, and maps while primary data will be obtained by carrying out Hydro-geophysical measurements within the study area using the necessary hydro-geological surveying equipment.

The Consultant is expected to have at this disposal and use for this exercise the new ABEM Terrameter SAS 1000, which distinguishes between clays and fresh water by use of Induced Polarization (IP) measurements. The specific activities shall include:

·Review of existing data, topographical maps, satellite images, existing studies and borehole site investigations in the area, geological reports and maps (if available), borehole and surface water records, etc

Mapping out of the water supply and current ground water sources in the vicinity - establishing water demand and taking key information from existing ground water sources to determine ground water potential and water quality

Hydro-geological fieldwork: Detailed reconnaissance survey of the project area. (GPS coordinates/P-codes, water level measurements, condition of these boreholes, usage, and performance where applicable) inspection of geological, geomorphological and structural characteristics of the investigated area; verification of existing data and findings
Conduct Hydrology, using up to date tools and equipment’s to ascertain the hydrogeology of the project area, previous ground water development, aquifer parameters, hydraulic conductivity (K) or the ground flux, ground water discharge, as well as estimating the mean annual recharge.

Perform Geophysics relating to basic principles, and do more than three Vertical Electrical Soundings (VES) within the proposed area using the ABEM Terrameter SAS 1000, which distinguishes between clays and fresh water by use of Induced Polarization (IP) measurements.

Analyze the data aforementioned (hydrogeological/geophysical data) to assess the ground water potential in the project area.

Make key recommendation on the viability of a borehole to be installed to act as water sources.
Check on site conditions including the availability of space for a drilling rig and other allied types of machinery to access the project area.

Select the MOST SUITABLE borehole site within the project area subject to the above results and taking into account the water quality expected and the requirements of the Water Act, WHO, and other line ministries.

Compile and submit to the client a comprehensive report, which shall include but not limited all the details of the above investigations. Consultant’s recommendations on the proposed drilling sites shall be produced in a soft copy (in a flash disk) and other three hard copies of the geo-survey reports, of which one (for each site) shall be colored.
Supervise the drilling works for the proposed ground water sources

How to apply:
Invitation to bid

Norwegian Church Aid (NCA) South Sudan Programme is launching a Local Open Tender and invites interested suppliers/candidates to participate in the procurement procedure for a Geophysical survey in Gumuruk ( 6.65 deg North , 32.92 deg East) , Greater Pibor , Boma State Republic of South Sudan.

All the goods/services are for a humanitarian project to be carried in the above state area.

All goods/services are to be delivered in Gumuruk, Pibor Area Republic of South Sudan.

The offered prices shall be quoted in USD only.

The Award criteria is clearly stated in the tender document.

All offers, in English language only, must be delivered to the office mentioned below by Norwegian Church Aid South Sudan Country Office in Buluk, Juba Republic of South Sudan by 4:00pm local time on the 28th August 2017. Late bids will be rejected. Applicants with questions regarding this tender should send them in writing using email not later than 27th August 2017 at 2:00 pm.

Tenders will be opened at the address mentioned below at the time stated in the Tender Dossier.

7. Tender documents will be available from NCA South Sudan Office in Buluk or interested bidders may request by sending to this email No. Taban.Charles@nca.no

. Interested tenderers may obtain the Tender Dossier in English at no cost from the Contracting Authority mentioned below.
Norwegian Church Aid South Sudan Country Office Buluk, Juba Republic of South Sudan

Contact Email: Taban.Charles@nca.no