Hydro geophysical survey, technical supervision and backstopping during borehole drilling

I. Consultancy Information

Title: Hydro geophysical survey, technical supervision and backstopping during borehole drilling

Reports to: Chief Executive Officer

Duty Station: Chisamba

Duration of Assignment: 6 consultancy effective Weeks

II. Background Information

Stewards Globe limited T/A Afriseed is seeking proposals from qualified firms or individuals to provide Hydro geophysical

Survey, technical supervision and backstopping during borehole drilling on Subdivision “A” of Farm Number 715 in Chikumbi Area with the extent of 81.5 hectares, located in Chisamba District of Zambia meant for agricultural research use. The stated location is approximately 40 kilometers from the Central Business District of Lusaka.

Similar Jobs in Zambia

Learn more about a Leading Agricultural company

A Leading Agricultural company jobs in Zambia

III. Objectives of Assignment

Project Goals and Objective

The consultant is expected to obtain data and provide the following recommendations.

a) Identify potential high yielding points (minimum 15 points) and conduct hydro-geophysical study for consideration in borehole drilling.

b) Recommend the drilling depth per point

c) Identify the ground formation in order to allow for the drilling contractor and client plan for drilling and borehole design.

d) Supervisory technical borehole drilling back stopping

Summary of Operation

Methodology

1. Hydro geophysical survey

The consultant should carry out detailed hydro-geophysical survey on the 81ha property in Chisamba to identify 05 good potential borehole points. The Consultant is expected to use both secondary and primary data in the exercise, Secondary data will involve desk study of available information from WARMA and data on surrounding existing boreholes, 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 for this assignment.

2 The Consultant is expected to carry out the assessment using the below listed scientific methods or any superior alternative suitable to the terrain of the area and deemed suitable by the client.

During the field surveys, the Consultant is expected to deploy the following methodologies

✓ combination of resistivity profiling and Vertical Electrical Soundings.

✓ The use of the Electrical Resistivity Tomography (ERT) method.

a) The consultant is expected to clearly mark the identified high yielding points using size Y-12 deformed metal bars cast in concrete.

2. Technical Supervision and backstopping during borehole drilling

Based on the geophysical report submitted by the consultant, the company will engage a driller to drill 5 boreholes. In consultation with the driller, the consultant will provide a work plan, rig movement plan, and supervise the drilling operations.

IV. Scope of work

Project Strategy/ Listing of Project Activities

The scope of works includes:

• Site visits to familiarize with the project areas. Identify any issues that might hinder the implementation of works.
• To obtain, study and synthesize background information including the geology, hydrogeology and existing borehole data, for the purpose of improving the quality of assessment and preparing comprehensive hydrogeological reports,
• To carry out hydrogeological evaluation and geophysical investigations in order to determine potential for groundwater and appropriateness of drilling boreholes at the farm
• Analysis of hydro-geological/geophysical data.
• Compilation, analysis, and evaluation of the gathered data and information.
• Site selection and reporting.

The outcome of the consultancy will be a detailed hydro-geological survey report giving details of the findings and recommendations for the proposed 5 boreholes

Technical Supervision and backstopping during borehole drilling,

Under the supervision of the Project Engineer, the consultant is expected to undertake the following Tasks:

• Maintain physical presence at the drilling site: The drilling supervisor should always maintain a constant physical presence with the drilling crew. Time off and downtime should be arranged in such a way that it coincide with the off days of the drilling crew.
• Conduct quality assurance of work done by providing oversight to drilling contractor, ensure standards and norms are adhered to during drilling works; this will include quality checks on screen and plain pipes used for boreholes.
• Liaison with contracted drilling company and client.
• Well design including casing, directional, fluids, cementing, bits and hydraulics programming.
• Prepare drilling reports and monitoring sheet as part of the regular reporting and updates.
• Day to day supervision of the drilling contract and drilling contractor in the field and accountable for the provision of technical, operational guidance, borehole installation, and borehole completion reports.
• Confirmation of drilling point: the consultant will read and interpret the geophysics results on the site selection and confirms the selected point with the geo coordinates, ensure that the driller drills at the best selected point – this is taken care of by the borehole site investigation
• Logging of drilling: the consultant will monitor the samples taken from the drilling cuttings and ensure that the drilling log is well completed.
• Monitor pumping test and recovery test: Ensure the drilling contractor performs the pumping and recovery for the well as per the specified hours and strategy.
• Water quality testing: ensure that water sample is taken through approved sampling method and sent to accredited lab for the testing.

REPORTING

The final report to be submitted will be a comprehensive account of the whole of the Consultancy; it will review the existing literature and other relevant information, such as drilling logs, satellite images, etc. The report shall include all field data, interpretations and justifications, hydro-geological evaluations, conclusions and recommendations relating to the investigated area. In addition, appropriate maps, diagrams and data plots shall be presented. Of considerable importance will be an objective assessment of the applicability and success of the methods applied.

The outline table of contents of the final report will be as follows: At a minimum, the following parameters are expected to be reported.

a) Name and details of applicant

b) Location and description of proposed Activity

c) Details of geology and hydrogeology

d) Graph of the survey (profiling and sounding)

e) Hydrogeological setting

f) Assessment of water quality and salinity

g) Assessment of availability of groundwater

h) Analysis of the reserve

i) Impact of proposed activity on aquifer, water quality, other abstractors, including likelihood of coalescing cones of depression and implications for other groundwater users in any potentially impacted areas

j) Sketch map showing location of selected suitable drilling points

k) Recommendations for borehole development, to include but not limited to, the following:

i. Locations of recommended borehole(s) expressed as a coordinate WGS 84 Decimal Degree format (s) and indicated on a sketch map (labeled (A, B and C) in order of drilling priority)

ii. Recommendations regarding borehole or well density and minimum spacing in the project area

iii. Recommended depth and maximum diameter

iv. Recommended construction characteristics, e.g., wire-wound screen, grouting depth

v. Anticipated yield

l) Any other relevant information (e.g., need to monitor neighbouring boreholes during tests).

m) The consultant should support the driller to provide borehole drilling reports at the end of the drilling campaign.

The reports will include the borehole logs, pumping and recovery test data and curves, water quality test results, preliminary and final borehole construction drawings among others.

The report should cover each of the above, insofar as data limitations allow. The report also should include maps, diagrams, tables and appendices as appropriate. Recommendations will be given on the most suitable site for borehole drilling, the required depth, water quality, design and installation details, and other relevant aspects. Based on the available hydro- geological and geophysical data, an assessment of the anticipated chances of success shall be made for each individual site.

All geophysical data, including its interpretation will be produced as an appendix to the final report.

The data obtained from the hydro geophysical survey will be an input for borehole drilling and supervision, therefore the consultant shall be expected to clearly submit in the inception report the methodology to be used during borehole drilling supervision and backstopping.

V. Expected Outputs and Duration of the Assignment

1. An accepted inception report which includes the proposed approach for the assignment, a description of the process, the methodology and implementation schedule. (Within a week of contract signing)

2. Accepted first report with fieldwork findings on hydro geological and hydro geophysical data, including recommendations submitted. (Within 3 weeks of contract signing)

3. Supervisory technical borehole drilling back stopping report (Within 6 weeks of contract signing)

IX. Qualifications

The following are the minimum qualifications and experience requirements:

Organisation

• Must be specialised in underground water study/ borehole sitting.
• Submit reference of similar works performed in the last 3 years with reference letters for each of the hydro geophysical consultancy.
• Must have both financial capacity and sufficient workforce to undertake the assignment.
• Be a registered Engineering firm with qualified Engineers OR hydrogeologists registered with the appropriate

Engineering Body.

• Be registered with Water Resources Management Authority of Zambia, WARMA.

Lead consultant- Hydro geologist

• University degree in geology, hydrogeology, groundwater mechanics, civil engineering or related technical field
• The lead consultant must be a member of a registered professional body e.g., EIZ
• A minimum of 7 years working experience in ground water exploration, including borehole sitting.
• Knowledge of use of ground water exploration software, with demonstrated borehole drilling supervision, monitoring and reporting.
• Remote operations supervision and contract management experience.
• Excellent computer skills in word, excel and related software
• Excellent writing skills and communication skills
• Knowledge of any of the local languages will be an added
• Excellent writing and communication skills in [English].
• Ability and experience to deliver quality reports within the given time.

Evaluation Criteria

a) The lowest Price Quote among technically responsive offers shall be considered,