Water Well SOW.docx

SECTION C – STATEMENT of WORK Water Well Project Antananarivo, Madagascar

CONTENTS:

I. PROJECT OVERVIEW

II. CONTRACTORS QUALIFICATIONS

III. SCOPE OF WORK

IV. QUALITY CONTROL

V. STORAGE OF MATERIALS

VI. PROJECT PROCEDURES

VII. PROJECT SAFETY

VIII. SCHEDULE OF DELIVERABLES

U.S. EMBASSY ANTANANARIVO, MADAGASCAR FACILITY MANAGEMENT

I. PROJECT OVERVIEW

The water well project aims to provide a sustainable and reliable water source by drilling one new well, including purchasing and installing the well pump and connecting the new well to the existing water pipes located at the US Embassy Andranomena. The Contractor will, in accordance with the terms and conditions set forth below, furnish all supervision, labor, management, facilities, supplies, equipment and material, and all required services necessary for the performance of the work.

II. CONTRACTORS QUALIFICATIONS

The contractor & sub-contractor must demonstrate expertise, experience, and capability in water well drilling, development, and construction. All qualifications must be documented and submitted for review before contract award.

III. SCOPE OF WORK

This document outlines the requirements for the installation of groundwater well. The well will be located in the areas indicated in Figure 1. The final decision regarding the exact placement of the well will be based on data collected from the hydrogeological survey, which will inform the most optimal locations for installation.

The Statement of Work (SOW) shall consist of two (2) phases:

Phase 1 - Hydrogeological Survey & Site Selection & Design The hydrogeological Survey, Site Selection & Design services shall include report and developing construction documents capturing the intent.

The phase 1 deliverables shall include site plans, hydrogeological report officially signed by a licensed hydrogeologist, geologist. specifications, equipment cut sheets, design calculations, and complete Issued for Construction (IFC) documents.

Phase 2 - Construction Services.

The construction services will include the drilling of water wells based on hydrogeological survey findings to ensure optimal water yield and sustainability. Additionally, a fully operational water system will be installed, incorporating essential components such as piping, pumps, filtration units, and control mechanisms to regulate water flow and distribution efficiently.

This SOW and associated documents define the services to be performed by the Contractor.

III. Phase 1 - Hydrogeological Survey & Site Selection & Design III.1.1 Hydrogeological Survey & Site Selection The well must be protected from the pollution of non-sanitary surroundings and should be located at the minimum distances from the structures or topographic features identified in Table 1 below:

Table 1. Minimum Well Location Distances

· Contractor is required to conduct a groundwater study to assess water availability and determine the depth of potential water sources. The study aims to evaluate hydrogeological conditions, aquifer characteristics, and water quality to support informed decision-making for well drilling and water resource management.

· Conduct a physical site survey to assess topography, land use, and potential groundwater recharge areas.

· Identify existing wells and surface water bodies that may influence groundwater flow.

· Perform electrical resistivity, seismic refraction, or magneto telluric surveys to map subsurface hydrogeology.

· Identify aquifer boundaries, depth, and potential water-bearing formations.

· Analyze geophysical data to determine optimal drilling locations, develop groundwater contour maps, aquifer cross-sections, and yield potential estimates, suitable well locations and drilling depths

· Assess soil and rock formations to determine the appropriate drilling method.

· Prepare a comprehensive report summarizing methodology, findings, and recommendations.

· Submit digital and hard copies of the report, including maps, data tables, and test results.

· Conduct a final presentation to discuss findings and next steps.

III.1.2 Regulatory & Legal Requirements

· Complying with local regulations is crucial for well construction.

· Obtain necessary water abstraction permits from local authorities.

· Secure environmental impact assessment (EIA) approvals if required

III.1.3 Design Contractor shall design and install a complete well system with sufficient integration of well components and other systems to ensure all components are matched and capable of delivering, conveying, and treating (as required) the required continuous yield from the well.

1.3 .1 Pump Specifications & Controls The contractor shall provide a pump with footing and a protective screen sized to prevent the introduction of sand or silt into the suction line. The pump motor shall be a three phase, 7.5 HP, 380 V, or higher pump. Capable of pumping water at a head pressure of 40 psi at a minimum of 50 feet above the ground surface. Pumps should be activated automatically, and it should stop when the pressure reaches the desired level. Pump shall be NSF/ANSI 61 certified or ACS certified.

The following model, or COR approved alternate is acceptable:

MFR: KSB

Model #: UPA C 150 Electrical spec: 50Hz – 380V https://www.ksb.com/en-nz/lc/products/pump/submersible-borehole-pump/upa-c-150/U16A

Controls:

MFR: KSB

Model #: UPA Control Electrical spec: 50Hz – 380V https://www.ksb.com/en-us/lc/products/pump-automation/upa-control/U05A The Embassy reserves the right to reject any pump that does not meet the specifications provided above.

1.3.2 Well Specifications

Well depth: 250 feet or higher depending to the water table level and geological study Diameter: 10 inches Pipe type: [Polyvinyl Chloride Casing (ASTM F480 and NSF 14, Schedule 40 or 80) or as approved by COR] Optimum Pumping Rate: 340GPM – 1400ft Typical Well Section: [Depth of Casing: 125-250ft], [Depth of Screen: 220 -250 ], [Depth of Sump: 225-250ft] Typical Water Elevation: [Distance below surface: 150 – 250 feet] Screen Material: Type 304 Stainless steel or as approved by COR.

The contractor shall perform the following services:

· Drill well at 250 feet depth and 16 inches width (diameter).

· Preparation of pipes infiltration and placement of filter element. Contractor is responsible for all materials.

· Development of drilling via Rotary drilled Complete drilling to estimated depth of usable groundwater and estimate safe yield for well prior to completion. Develop wells to maximum yield per meter (foot) of drawdown.

· Fill annular space from top to bottom with concrete grout and provide permanent casing with temporary well cap. Top of casing should be 900 mm (36 inches) above finished grade.

· Finalization of the project with concrete cover at the annular space extending at least one meter from well casing. Provide casing vent that extends above top of well casing, with pipe turned down and capped with mesh to prevent insects from entering well. Seal space between well casing and concrete with silicone sealant.

· Connection of the well water pipe with existing pipe

· Purchase of one 3 Phase pump(s) with Thermoplastic Heat and Water- resistant Nylon-coated electric wire and installation accessories

· Install the pump and test for plumbness and alignment per AWWA A100. Electrical connection will be done by the US embassy

· Conduct final pumping tests after wells have been constructed, cleaned, and tested for plumbness and alignment.

· Disinfection, testing and measuring flow of the well.

a) Upon completion, well shall be disinfected in accordance with current AWWA (American Water Works Association) standards (AWWA C654 -13) for well disinfection except that the disinfectant shall remain in the well for at least twenty-four hours.

b) Before placing the well in service, the water containing the disinfectant shall be flushed from the well and then samples of water shall be collected and submitted for microbiological analysis until three successive daily raw water samples are free of coliform organisms.

c) A complete physical and chemical analysis of the water produced from a new well must be made after 36 hours of continuous pumping at the design withdrawal rate. The samples should be submitted to a certified laboratory for analyses. Water quality tests shall include those parameters and methods shown in Table 2 below.

· Clean work site area after completion of the work each day

· Restore work site to pre-construction conditions

· Monitor any discrepancies and corrective action Table 2. Basic Water Quality Analyses for Well Water Samples1

Chemical/Physical Parameters Arsenic Barium Cadmium Chromium Cyanide Fluoride Iron, Total Lead Manganese, Total Mercury Nitrate Nitrite Selenium Sodium Sulfate Zinc

Calcium Chloride Magnesium Potassium Alkalinity Color Conductivity2 Carbon Dioxide (CO2) Dissolved Oxygen (DO) Hardness (Total and Ca) Hydrogen sulfide (H2S) pH2 Temperature2 Total Dissolved Solids (TDS) 2 Turbidity

Samples should be collected after the well has been pumped (or bailed) long enough to remove standing water, mud and other foreign material, including development and disinfectant chemicals, so as to insure that ground water has entered the well and the sample is representative of the water in the aquifer(s) .

Bacteriological

Total and Fecal Coliform Total Plate Count Testing for bacteriological quality is the final step in well completion.

The sample is collected from the pump discharge after the well has been disinfected and the chlorine removed by pumping.

1 Includes constituents and contaminants identified in EPA 570/9-75-001 (Manual of Water Well Construction). Additional Safe Drinking Water Act regulated parameters should be tested if water is intended to be used for human consumption as identified in EPA 816-F-09-004 (per current OBO specifications, i.e. SECTION 332100 - WATER SUPPLY WELLS, January 2012).

III. Phase 2 – Construction Services III.2 Well Drilling

· Mobilize the drilling rig and all associated equipment to the site. Ensure that all necessary machinery, tools, and materials are transported safely and are fully operational upon arrival. Confirm that the equipment is properly set up and ready for drilling operations according to the site’s specific requirements.

· Drill a borehole to the specified depth, as determined by the findings from the hydrogeological survey. Ensure that drilling operations are carried out efficiently and safely, maintaining precise control over the depth and alignment. Regularly monitor the progress and adjust techniques if necessary to meet the required depth and ensure the integrity of the borehole.

· Utilize the appropriate rotary drilling techniques based on the specific soil and rock conditions encountered during the drilling process. Carefully assess the geological characteristics at each stage to determine the most effective drilling methods and adjust equipment settings accordingly. This ensures optimal penetration rates, minimizes wear on the drill bits, and maintains borehole stability throughout the operation.

· Conduct detailed logging of the soil and rock formations encountered during drilling. Record observations such as the type, texture, color, and consistency of the materials, as well as any significant changes in strata. Include the depth at which each formation is encountered and note any indications of groundwater or other relevant geological features. This data will be essential for analyzing subsurface conditions and informing the design and implementation of the groundwater well.

· Temporarily case the borehole if necessary to prevent collapse during drilling operations. Install a temporary casing to maintain the structural integrity of the borehole and prevent loose soil or rock from entering the hole. This step ensures that the borehole remains open and stable, especially in areas with unstable or loose formations, until further drilling or permanent casing can be completed.

III.3 Well Casing and Screen Installation

· Install a permanent well casing made of Polyvinyl Chloride Casing (ASTM F480 and NSF 14, Schedule 40 or 80 with a minimum diameter of 16 inches. The casing material and specifications should be selected to ensure durability, prevent collapse, and provide long-term protection against contamination. The casing should be properly aligned and securely set to ensure its stability in the borehole, with adequate sealing to prevent water ingress or egress where necessary.

· Place a well screen at the aquifer zone to facilitate water entry while effectively filtering out sediments. The screen should be carefully selected based on the aquifer characteristics, ensuring it has the appropriate slot size and material to prevent clogging and ensure efficient water flow. The screen must be properly installed to ensure it is securely positioned in the aquifer zone, allowing for optimal water intake while preventing the intrusion of unwanted particles into the well.

· Select the appropriate slot size for the well screen based on the results of the soil analysis. The slot size should be chosen to match the grain size of the surrounding soil or rock to ensure optimal filtration, allowing water to flow into the well while preventing the entry of fine sediments or particles. This ensures the long-term efficiency of the well and reduces the risk of clogging or damage to the screen.

· Pack clean, well-graded gravel around the well screen to enhance filtration and promote efficient water flow. The gravel should be carefully placed to create a uniform filter zone around the screen, allowing water to enter the well while effectively trapping sediment and preventing clogging. Ensure that the gravel is free of fine particles that could impede flow or degrade the well's performance over time. The gravel pack should be properly compacted to maintain stability and ensure long-term functionality.

· Seal the annular space with bentonite or cement grout to prevent surface contamination.

III.4 Well Development

· Conduct airlifting or surging to remove fine sediments from the well and clear the screen area. Airlifting involves using compressed air to lift and flush out suspended particles, while surging entails rapidly raising and lowering the water level to dislodge sediment.

· Perform test pumping to establish well efficiency and yield.

· Clean the well thoroughly before installing the pump system.

III.5 Pump System Installation & alignment

· install a submersible pump with adequate torque arrestor designed for deep wells according to manufacturer recommendations

· Lay electrical wiring and install a pump control panel (for submersible pumps).

· Fit check valves to prevent backflow.

· Check Vertical Alignment: The pump must hang straight in the well casing without touching the walls.

III.6 Water Quality Testing and Disinfection

· Well should be disinfected according to the current AWWA standards (AWWA C654- 13) and disinfectant should remain in the well for at least 24 hours. After which, flush the well and collect samples for microbiological analysis.

· Complete physical/chemical analysis of the water panel after continuous pumping test. For potable use, testing should include parameters and methods shown in the attached (refer to Table 2).

III.7 Piping and Water Storage System

· Contractor shall connect well sites into the existing distribution system.

· Install and securely connect distribution pipes to transport water from the well to the existing local city water pipe, which supplies the storage tanks. Ensure that the pipes are made of durable, corrosion-resistant materials and have an appropriate diameter to efficiently handle the required water flow. Properly seal all connections to prevent leaks and integrate three-way control valves to regulate flow effectively. Adhere to local plumbing codes and regulations throughout the installation process. After completion, conduct pressure tests to verify the system’s integrity, functionality, and leak resistance.

· Additional 3-way ball valve is required to select between well water and local city water

III.8 Controls The contractor implements the monitoring/control system for the pump house. The system will have the capacity perform manual & remote on/off control of the pumps. The location of the remote on/off control for the pumps shall be on the utility Building.

III.9 Well Identification Well shall be properly labeled with an identification plate immediately upon well completion. The identification plate shall be constructed of a durable, weatherproof, rustproof material. The identification plate shall be permanently secured to the well casing or enclosure floor around the casing where it is readily visible. The identification plate shall include the following:

· Company name and certification of well driller.

· Date the well was completed.

· Total depth (feet or meters) and static water level (feet or meters).

· Casing depth (feet or meters)”

III.9 Written reports The contractor is required to provide the following written reports:

a) Field documentation report to include:

i. Casing material, diameter, and depth below grade

ii. Screen material, construction, diameter, and opening size

iii. Pumping test with static water level, maximum safe yield, and drawdown at maximum yield

iv. Well log indicating strata encountered

b) Operation and Maintenance information for each well pump, [valves, motors, and well screen] to include in emergency, operation, and maintenance manuals.

c) List of recommendations for repair and improvements with proposed costs to ensure the well is performing per the original design.

a) Copy of all inspection and test results (hydrostatic, water quality analysis, performance test data).

b) Debrief to Embassy point of contact.

c) List of immediate safety issues

IV. QUALITY CONTROL

A. The Embassy has the right to inspect and test all services, to the extent practicable at all times and places during the work. Embassy Facility Management staff may perform full time quality assurance inspections and tests during construction to confirm the work is installed according to the Scope of Work.

B. Maintain quality control over suppliers, manufacturers, products, services, site conditions, and workmanship to produce work of specified quality.

C. The Work shall be governed by the U.S. Embassy, Antananarivo, Madagascar. All work is to be in compliance with International Codes and standards, which includes the most recent published edition of the National Fire Prevention Association (NFPA), International Fire Code (IFC), International Building Code (IBC) , International Mechanical Code (IMC), International Plumbing Code (IPC), National Electrical Installation Standards (Neis), National Electrical Safety Code (NESC), Standard for Electrical Safety in the Workplace (NFPA-70E) and National Electric Code (NFPA-70) as amended by OBO, also are applicable. Should there be a discrepancy between the US Embassy Specifications and the applicable Building Code, the more stringent of the two shall govern.

D. The Contractor is responsible for compliance with all Building Codes; Work not in compliance with the Codes shall be deemed to be unacceptable.

V. STORAGE OF MATERIALS

· Proper storage of materials is the sole responsibility of Contractor. Keep all labels intact and legible, clearly showing the product, manufacturer, and other pertinent information.

· Store materials on site. Cover and protect materials subject to damage by weather, including during transit. Stored materials shall be available for inspection.

· Store flammable and volatile liquids in sealed containers located a minimum of 20 feet from existing buildings.

· Liquid products shall be delivered sealed, in original containers. Store roll goods in an upright position.

· Secure equipment, material, and debris to prevent movement by wind or other elements.

TEMPORARY FACILITIES:

A. Temporary Water:

1. Plan with Embassy for water required for construction. Embassy will pay for cost of water.

2. Coordinate all water service disruptions with the Facility Manager

3. Provide hoses for conveyance.

B. Temporary Electrical

1. Electrical service is available adjacent to the project site. Service is 220V ac, 50Hz.

2. Arrange with Embassy for temporary electrical service. Embassy will pay energy charges for temporary power and lighting.

3. Notify Embassy prior to each required interruption of mechanical or electrical services in the building.

4. Provide all necessary temporary wiring extensions and temporary lighting devices.

C. Temporary Ladders, Chutes, Scaffolds, Hoists and Cranes:

1. Furnish and maintain temporary ramps, scaffolds, hoists, or chutes as required for proper execution of Work.

2. Restrict debris removal to Embassy -approved area of building site.

3. Restrict location of equipment to areas as approved by Embassy.

4. Such apparatus, equipment, and construction shall meet requirements of applicable federal, state, and local safety and labor laws.

VI PROJECT PROCEDURES

A. The Embassy will be occupied during the entire period of construction for the conduct of normal, daily operations. Contractor shall conduct his operations so as to ensure least inconvenience to Embassy occupants.

B. Contractor shall take precautions to avoid excessive noise or vibration that would disturb the occupants. When directed by Embassy, Contractor shall perform certain operations at designated time of day or night in order to minimize disturbance.

C. Drawings: This scope of work (SOW) accompanies design drawings to comprise the project manual. Contractor is to field verify all drawings prior to the commencement of the work.

D. Contractor is required to have an English-speaking representative on site at all times.

VII - PROJECT SAFETY & SECURITY:

A. Contractor is responsible for safety and shall comply with US Embassy requirements, US Army Corp of Engineers (USACE) Safety Manual (EM 385-1-1), U.S. OSHA Regulations and all local labor laws, regulations, customs and practices pertaining to labor, safety and similar matters. Contractor shall prepare a Construction Accident Prevention Plan to cover total project safety to be reviewed and approved by the Contracting Officer Representative (COR), and U.S. Embassy Post Occupational Safety and Health Officer (POSHO).

B. Contractor shall furnish Personal Protective Equipment (PPE) for each employee as required for the specific job type and in accordance with (IAW) relevant OSHA regulations.

SECURITY:

A. Personnel Clearances:

1. A Visit Authorization Request (VAR) will be required for all contractor personnel prior to entry. Contractors shall forward the following information to the COR: full name, date and place of birth, Government Identification Card, name of employer, position/discipline.

B. Vehicle Clearances: Submit authorization requests, to include dates, vehicle type, license number, and driver name, for each motorized vehicular implement used on-site.

C. Access to Site: Contractor shall have limited access to or be admitted into the compound outside the areas designated for the project except with permission by the Embassy.

D. Procurement/Storage: Materials shall be procured by NON-SECURE or local means and stored NON-SECURE. All materials may be inspected prior to use on the project.

VIII SCHEDULE OF DELIVERABLES

Copies

To

· Hydrogeological reports,

· Design & documents

Electronic

Mobilization

ATTACHMENT #4

Site Map

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