1. BACKGROUND AND CONTEXT

About the Task

AATF is seeking the services of an individual or firm to provide the services of hydrological survey and drilling of a borehole in Fasola, Oyo state Nigeria.

Brief Description of AATF

AATF is a not-for-profit organisation with a mission of making available, to smallholder farmers, agricultural technologies that were previously not accessible to them. Founded on the premise of tackling poverty and food insecurity through technological interventions, AATF empowers farmers to transform their livelihoods by equipping them with better tools and inputs that would, without the organisation’s intervention, take a much longer time to reach them and cost a lot more. These efforts, combined with optimal agricultural practices and product value addition, will contribute to agricultural transformation in Africa leading food security and poverty reduction in sub–Saharan Africa.

2. About the Cassava Processing Project

Through the AATF Special Initiative for Strengthening Cassava Agro-PrOcessing and Digital Solutions (ASIST- APOD), AATF has acquired a new Cassava processing technology for processing high quality cassava flour without peeling the roots. The Machine will be installed in Fasola, Oyo State-Nigeria.

This initiative presents a novel model that seeks to utilize digital tools to enhance access to mechanization services and improved agronomy, then establish a centralized cassava processing facility that will be accessible to village-based processors who would otherwise not be able to afford modern cassava processing equipment. Accessing this service will enable them to diversify their products, hence creating more value for the tubers. The plant will require adequate supply of good quality water at different stages of the processing.

The current project is therefore to drill the borehole that will supply water to the Factory.

3. Objectives of the Service and Scope of work

The Contract to be established is for the drilling, construction, and development of one borehole in Fasola, Oyo State Nigeria. The borehole, will be tentatively 100 m deep, achieving a full penetration of the A7/B2 aquifer; drilled in 26” (15 m), 17” ½ (50 m) and 12” 1/4 (35m) diameters; equipped with 20”, 14” and 10¾” API Carbon Steel, 5L Grade B casings and screens. Additionally, a pumping test (step-drawdown and constant-rate pumping test) is to be carried out and analyzed to determine the safe yield together with water quality analyses together with geophysical logging.

The location of the borehole is about 7.89871, 3.77274, within the Fasola Agribusiness Processing Hub. The drilling contractor shall be responsible for drilling, installation of casings and screens, B3 toxic oil shale layer seal, sanitary seal, borehole development, pumping tests, water quality testing required for obtaining an operating license, and construction of aprons, drainage and soak ways. Where access conditions are difficult, it is expected that the Drilling Contractor shall make allowances for this as part of the drilling cost.

The project is to start as soon as the contract is signed, tentatively on March 28, 2024, and is expected to last for two weeks, including the period needed for the driller to obtain the permit.

The specific tasks will include but not limited to:

Hydrogeological surveying to be conducted prior to drilling the borewell to ascertain the quality and quantity of water available at the site and guide in choosing of the exact location where the borehole will be drilled.
Mobilizing a reverse rotary drilling rig.
Drilling, installing, and cementing a 20” conductor casing to a minimum depth of 15 mbgl within a 26” diameter borehole to serve as the sanitary seal,
Drilling and sampling approx. 17 ½ in. diameter hole to a total estimated depth of 100 M mbgl, with deviation surveys being performed every 30m,
Conditioning and cleaning the borehole, as necessary, prior to running all the geophysical borehole.
A caliper survey on the borehole less than 8 hours prior to the installation of the casing
Update of BH design to match site conditions and submittal for client’s approval.
Installing the casing in the upper part of the borehole, with centralizers, concrete feed pipe and sounding tube.
Pouring a cement seal at the end of the borehole and in the space between the casing and the borehole wall above the cement seal up to the ground surface.
Conditioning and cleaning the borehole, as necessary, prior to running all the geophysical borehole.
logs, as specified, performing e.g. a caliper survey on the borehole less than 8 hours prior to the installation of the casing.
Update of BH design to match site conditions and submittal for client’s approval.
Installing the casing of 10.75 inch in the borehole, with centralizers and sounding tube.
Performing initial development by airlifting and swabbing from between packers,
Removing fill material from the blank casing below the screened interval,
Demobilizing the drilling rig and associated drilling equipment,
Mobilizing the test pump and support equipment,
Installing a deep well turbine test pump with a variable speed engine,
Performing final development using a deep well turbine test pump,
Performing well and aquifer tests (including equipment test, step-drawdown test, constant-rate, and recovery tests, as well as conducting a spinner survey),
Collecting water quality samples
Removing the test pump from the borehole,
Performing plumbness and alignment surveys in the well,
Bailing the well to remove sediments that have accumulated during test pumping,
Performing a “dual cam” video survey on the borehole,
Disinfecting the well using a sodium hypochlorite solution and securing the well against entry.
Demobilizing all equipment, including site cleanup, restoration, and wellhead completion.

4. Deliverables

Hydrology survey report
End of drilling phase report with the updated borehole design.
Fully finished, developed, and certified borehole as per final design (tentative design adapted to the encountered conditions) including concrete platform.
Pumping test and interpretation report with a declaration of safe yield.
Borehole completion report.
Operational license.

5. Indicative Schedule of Activities

The prospective contractor shall submit a comprehensive work schedule within his/her proposal which should fall within the period specified in the Terms of Reference.

The work schedule shall include obtaining the necessary permits, setting up the base camp, and moving the drilling units and support equipment to the drill site. It shall also include the premobilization meeting, and site restoration and demobilization.

Once the contract is awarded, and before the mobilization to the base camp, or drilling site the Drilling Contractor shall be required to submit the updated schedule for the completion of the works in a Gantt chart of weekly activities as specified in the Terms of Reference.

This schedule shall be checked and approved by the Supervisor. The schedule is to be updated at least monthly.

6. Qualifications, Experience and Skills

The following skills are expected in the team at a minimum:

The project Manager/drilling engineer

The project Manager/drilling engineer should have civil/water engineer or equivalent technical qualification. The Project Manager should have at least 10 years of experience in Borehole drilling, construction, management, and operation of water projects.

Hydrogeologist

The hydrogeologist should have hydrogeology or equivalent technical qualification and experience in the engineering sector specially BH drilling in public water/wastewater utilities. At least five years of experience in the monitoring and supervision of BH drilling and day-to-day quality check, control and provide technical support to the successful BH implementation.

7. Payment for Drilling

The Drilling Contractor shall be paid unit prices per meter in accordance with the actual depth drilled on the ratios as set out in the bill of quantities.

The unit prices per meter shall include all costs associated with the drilling, drilling water, drilling additives, surface casing and collection of drill cuttings, gravel packing and development, and preparation of daily drilling reports.

The depths given in the TOR and bill of quantities are indicative only.

The unit prices are fix even if there are changes in the quantities.

8. Terms of Payment

Payments to the drilling contractor will be made in instalment as follows:

25% at the signing of the contract to facilitate mobilization of equipment.
50 % after successful mobilization to the site
25% Upon completion of all the tasks as per this TOR, testing and project hand over.

9. Application Criteria

Interested drilling contractors either individual or firm should submit a detailed proposal capturing the following:

A professional company profile with all the relevant registration and tax clearance documents attached as Annexes.
Company Experience: Evidence of Company proven experience with details of contracts and references for works undertaken similar in drilling and BH operation.
An overview of how the candidate meets the qualifications, experience, and skills requirements (no more than one page). CVs of team members to be attached as annexes.
Methodology of BH installation work.
A brief financial proposal expressing the cost categories.

10. Evaluation and Award of the Consultancy

AATF will evaluate the proposals and award the assignment based on technical and financial feasibility.

AATF reserves the right to accept or reject any proposal received without giving reasons and is not bound to accept the lowest or the highest bidder.

Any additional project details will be given to selected/shortlisted candidates.

11. Deadline for Submission

The technical and financial proposals must be received by email at the address: procurement@aatf-africa.org no later than 22^nd March 2024 at 17:00 Hrs., East African Time. Clearly indicate FASOLA BOREHOLE DRILLING on the subject line of the email.