scope of work water storage tank ......tank and existing water treatment plant), per 2020 obo...

SCOPE OF WORK

WATER STORAGE TANK REPLACEMENT

U.S. EMBASSY DAR ES SALAAM, TANZANIA

Rev-1

1 PROJECT DESCRIPTION

This project work is to provide all engineering, material, and labor to design, construct, ship,

install, and commission potable/domestic water treatment equipment for the U.S. Embassy in

Dar Es Salaam, Tanzania.

1.1 The U.S. Embassy in Dar Es Salaam, Tanzania requires a replacement to the existing

water storage tank located on the Embassy grounds. The upgrades described in this

statement of work will allow the Embassy to continue to provide high quality water to the

residences for domestic end uses. The existing water storage tank is composed of a

fiberglass tank which has ruptured, causing a decrease in storage capacity.

The current water storage tank is a 100,000 liter Glass Reinforced Plastic Tank (GRP)

manufactured by MerryWater AG Limited. It is constructed upon a concrete slab. The

dimensions are 10 m long, 5 m wide, and 2 m high. Each panel of the tank is 2 meters by

1 meter. The tank was installed in February 2011.

Water flows from the water treatment plant and into the tank via a 3 inch diameter pipe

located near the top of the tank. The water is then pumped out of the tank and into tanker

trucks via a 6 inch diameter outlet pipe near the bottom of the tank. The pumps are located

in an adjacent pump house and will remain. The tank also contains a 3 inch diamer washout

pipe installed on the floor of the tank. All three pipes are of PVC materials.

1.2 The project work includes:

1.2.1 Designing or purchasing a replacement to the water storage tank tailored to the

specific site requirements. The upgraded tank shall contain a capacity of 100,000

Liters with the same storage dimensions as the existing tank. The tank shall be Glass

Reinforced Plastic (GRP) or equivalent.

1.2.2 Construction of the tank will be installed on the existing reinforced concrete slab

suitable to support the operating weight of the water storage tank. Dimensions are 5

meters x 10 meters rectangular (See Attachment 1).

1.2.3 Installing float switches flow valves to control the level of water. All sensors shall

have communication with BAS system for data/trending purposes.

1.2.4 Reconnecting mechanical and electrical services to the water storage tank to include

tie-ins with existing utility water supply (from entry into the exising water storage

tank and existing water treatment plant), per 2020 OBO Electrical Code (2014 U.S.

National Electric Code (NEC) and OBO supplements).

1.2.5 Providing and installing all new water piping, which shall be HDPE or PP-P fusion

pipe constructed on site.

1.2.6 Providing and installing a new anti-vortex plate inside the water tank.

1.2.7 Removing the existing flow meter located adjacent to the existing water storage tank,

which measures water flow into the tank, and adding NSF 61 certified, direct read

potable water meter, which measures in gallons, with low flow indicator in the pump

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house and at beside water tank. The existing flow meter located at the pump house to

remain.

1.2.8 Install an awning to protect the tank from direct exposure to the sun.

1.2.9 Providing a sequence of operation for the water storage tank.

1.2.10 Providing unlocked Programmable Logic Controller (PLC).

1. All hardware and software equipment (PC laptop with carrying case,

software loaded on PC, programming cable, and support connections).

2. PLC Programming Language shall be Ladder Diagram (LD), also known

as Ladder Logic.

1.2.11 Providing all critical spare parts.

2 GENERAL CONDITIONS

2.1 Prior to bid, the Contractor must make an ON-SITE visit with qualified engineers and

electricians to determine exact site conditions.

2.2 Water treatment shall conform to requirements in Chapter 6 of the OBO Plumbing Code

(International Plumbing Code as amended by OBO).

2.3 All piping, components, materials, mechanical devices, process media, and non- metallic

materials must comply with NSF 14, 61 and NSF 372 or COR approved equivalent, as

appropriate.

2.4 All new water piping and fittings shall be HDPE or PP-P fusion pipe constructed on site.

2.5 A Qualified Person must be on-site at all times during the implementation of this scope of

work.

2.6 All electrical work must be performed by U.S. certified and licensed Electricians or

Electricians with National Certification from an acceptable certifying organization.

2.7 All mechanical work must be performed by certified and licensed Pipe-Fitters.

2.8 All equipment installed shall be factory tested at the Contractor’s site prior to shipping, using

factory-recommended procedures, and by factory certified representatives.

2.9 All equipment and materials for the project shall be delivered, stored, and handled as

follows:

2.9.1 Preparation for Transport:

2.9.1.1 Ensure items are dry and internally protected against rust and corrosion

2.9.1.2 Protect against damage to threaded ends and flange faces

2.9.2 Delivery:

2.9.2.1 Deliver piping with factory-applied end caps. Maintain end caps through

shipping, storage, and handling to prevent pipe-end damage and to prevent

entrance of dirt, debris, and moisture.

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2.9.3 Storage:

2.9.3.1 Protect from weather. Store indoors and maintain temperature higher than

ambient dewpoint temperature. Support off the ground or pavement in

watertight enclosures when outdoor storage is necessary.

2.9.3.2 Protect stored piping from moisture and dirt. Elevate above grade. Do not

exceed structural capacity of floor when storing inside.

2.9.3.3 Protect flanges, fittings, and specialties from moisture and dirt.

2.9.3.4 Store plastic piping protected from direct sunlight. Support to prevent

sagging and bending.

2.10 All equipment installed shall be commissioned on-site using factory-recommended

procedures and by factory certified representatives.

2.11 All labor, tools, and materials must be provided by the Contractor. The Contractor will not

be allowed to use USG equipment.

2.12 Packaging and Marking of Equipment shipped to:

U.S. Embassy

Dar Es Salaam, Tanzania

2.13 Direction for changes in the Scope or Cost of this Work can only come from the Contracting

Officer (CO).

2.14 Additional costs will not be accepted if a contract change order has not been given by the

Contracting Officer. Any work performed on this project outside of the Scope of Work

provided by the Contracting Officer shall be deemed not reimbursable by the U.S.

Government.

2.15 All scheduling, submittals, and installation will be coordinated through the Contracting

Officer’s Representative (COR).

2.16 Contractor is responsible for providing:

2.16.1 All analyses, engineering, material, and labor to design, construct, ship, install, and

commission.

2.16.2 All interconnecting piping and wiring of all equipment and instrumentation within

the water storage tank.

2.16.3 Siting, designing, and installing a container for storing items, tools, etc. and a spill

containment area for chemicals and equipment, as needed.

2.17 Post is responsible for providing:

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2.17.1 All essential utilities (electrical, water) as needed for the designated connection

points.

2.17.2 Electrical load center(s) or required convenience outlets.

3 PERSONNEL REQUIREMENTS

3.1 Contractor Supplied Personnel Technical Qualifications For Custom Building Upgrade

Water Storage Tank.

3.1.1 Installation and Performance Testing Labor. All contractor-provided installation and

performance testing labor furnished under this contract shall be executed only by

licensed plumbers and or certified water specialists. All professional tradesmen

licenses for Contractor personnel shall be current and valid at the time of COR review

and shall be maintained and remain current and valid for the complete duration of the

project execution.

3.1.2 Use of Non-Licensed Labor

3.1.2.1 Contractor use of non-licensed electrical and mechanical laborers, helpers,

etc. to execute, plan, layout, or otherwise direct the execution of the work

activities under this contract is not allowed.

3.1.2.2 Non-licensed hired labor shall not perform functions beyond manual labor

such as debris removal and must be directly managed and supervised by the

contractor.

4 SAFETY

4.1 General. The contractor shall provide and maintain work environments and procedures

which will safeguard the public and Government personnel, property, materials, supplies,

and equipment exposed to contractor operations and activities; avoid interruptions of

Government operations and delays in project completion dates; and control costs in the

performance of this contract. For these purposes, the contractor shall:

4.1.1 Provide appropriate safety barricades, signs and signal lights,

4.1.2 As applicable, comply with the OBO/CFSM Division 1, Section 013525

Construction Safety and Occupational Health standards as referenced in:

4.1.2.1 The latest edition, U.S. Army Corps of Engineers (USACE) Safety and

Health Requirements Manual, EM 385-1-1 dated 30 November 2014. This

document is available at the U.S. Government Printing Office, Washington,

D.C.

4.1.2.2 NFPA Code 241, Standard for Safeguarding Construction, Alteration, and

Demolition Operations.

4.1.2.3 ANSI A10 Series Standards for Safety Requirements for Construction and

Demolition.

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4.1.2.4 NFPA Code 51B, Standard for Fire Prevention during Welding, Cutting,

and Other Hot Work.

4.1.2.5 NFPA 10, Standard for Portable Fire Extinguishers.

4.1.2.6 NFPA 70, National Electrical Code

4.1.2.7 Department of State, Office of the Procurement Executive, PIB # 2015-05,

Combating Trafficking in Persons.

4.1.3 Ensure that any additional measures the contracting officer determines to be

reasonably necessary for this purpose are taken.

4.1.4 For overseas construction projects, the contracting officer shall specify in writing

additional requirements regarding safety if the work involves:

4.1.4.1 Scaffolding;

4.1.4.2 Work at heights above two (2) meters;

4.1.4.3 Trenching or other excavation greater than one (1) meter in depth;

4.1.4.4 Earth moving equipment;

4.1.4.5 Temporary wiring, use of portable electric tools, or other recognized

electrical hazards. Temporary wiring and portable electric tools require the

use of a ground fault circuit interrupter (GFCI) in the affected circuits; other

electrical hazards may also require the use of a GFCI;

4.1.4.6 Work in confined spaces (limited exits, the potential for oxygen less than

19.5 percent or combustible atmosphere, the potential for solid or liquid

engulfment, or other hazards considered to be immediately dangerous to life

or health such as water tanks, transformer vaults, sewers, cisterns, etc.);

4.1.4.7 Hazardous materials—a material with a physical or health hazard including

but not limited to, flammable, explosive, corrosive, toxic, reactive or

unstable, or any operations which create any contamination inside an

occupied building such as dust from demolition activities, paints, solvents,

etc.; or

4.1.4.8 Hazardous noise levels.

4.2 Records. The contractor shall maintain an accurate record of exposure data on all accidents

incident to work performed under this contract resulting in death, traumatic injury,

occupational disease, or damage to or theft of property, materials, supplies, or equipment.

The contractor shall report this data in the manner prescribed by the contracting officer.

4.3 Subcontracts. The contractor shall be responsible for its subcontractors' compliance with

this clause.

4.4 Notification. The contracting officer shall notify the contractor of any non-compliance with

these requirements and the corrective actions required. This notice, when delivered to the

contractor or the contractor's representative on-site, shall be deemed sufficient notice of the

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non-compliance and corrective action required. After receiving the notice, the contractor

shall immediately take corrective action. If the contractor fails or refuses to take corrective

action promptly, the contracting officer may issue an order suspending all or part of the

work until satisfactory corrective action has been taken. The contractor shall not be

entitled to any equitable adjustment of the contract price or extension of the performance

schedule on any suspension of a work order issued under this clause.

5 SCOPE OF WORK

5.1 Prior to Implementation

5.1.1 Submit final upgraded water storage tank design drawings to the CO and/or COR

within 30 days of Notice to Proceed, that includes:

5.1.1.1 Single-line electrical schematic with wire sizes and expected loads

5.1.1.2 Single-line piping layouts with pipe sizes

5.1.1.3 Final General Layout

5.1.1.4 Final Work Plan

5.1.1.5 Electrical components to include:

5.1.1.5.1 Wire (THHN REQUIRED)

5.1.1.5.2 Breaker sizes (must match existing panel manufacturer and model

type

5.1.1.5.3 Conduit

5.1.1.5.4 Galvanized Rigid Conduit (GRC)

5.1.1.5.4.1 Intermediate Metal Conduit (IMC)

5.1.1.5.4.2 Electrical Metallic Tubing (EMT)

5.1.1.5.4.3 Schedule 80 PVC Conduit

5.1.1.5.4.4 Conduit fittings (compression only)

5.1.1.6 Water piping components to include:

5.1.1.6.1 Valves – 3” and smaller must be full port ball valves

5.1.1.6.2 All new water piping shall be HDPE or PP-P fusion pipe

constructed on site.

5.1.1.6.3 Supports (galvanized or epoxy coated only)

5.1.2 The submittal package shall be complete in all aspects and shall include equipment

details and a complete materials list.

5.1.2.1 Complete finalized Work Plan including details of placement, connection

and operations of the upgraded water storage tank and Critical Path Method

(CPM) schedule.

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5.1.2.2 The Work Plan shall clearly show planned outages and detail cooperation

and assistance requested from Post to accomplish the work.

5.2 Implementation

5.2.1 Water Piping Installation:

5.2.1.1 Contractor shall supply and install water piping from existing water storage

tank entrance to proposed water storage tank in accordance with the approved

design drawings.

5.2.1.2 Transitions from PVC/PE piping to copper piping must be independently

supported.

5.2.1.3 All piping penetrations through concrete must be sleeved so that piping does

not come in direct contact with concrete material.

5.2.1.4 Contractor will core through concrete floor/wall foundations at a minimum

of 24 inches below grade when routing piping through obstructions.

5.2.1.5 PIPING AND VALVES

5.2.1.5.1 All new water piping shall be HDPE or PP-P fusion pipe

constructed on site. New anti-vortex plate shall be installed on

the duplex water booster pumps or inside the potable water

tank.

5.2.1.5.2 All isolation valves shall be quarter-turn ball valves rated for

300 psi and potable water service.

5.2.1.5.3 All hangers and pipe support must be galvanized or epoxy coated

type.

5.2.1.6 Contractor shall flush and chlorinate the water storage tank and all piping

prior to making final connections and prior to final acceptance, per AWWA

Standards C652-11 and C653-13.

5.2.1.7 Contractor shall coordinate tie-in of the new water service with the COR.

5.2.1.8 All materials will be supplied by the contractor.

5.2.2 Electrical System

5.2.2.1 All electrical wiring shall be THHN, 90degC rated.

5.2.2.2 All conduit installed inside of the electrical switchgear room shall be

galvanized rigid conduit (RGC), galvanized intermediate metal conduit

(IMC), or liquid-tight flexible conduit with appropriate fittings.

5.2.2.3 All above-ground conduit installed outside of the electrical switchgear room

shall be galvanized rigid conduit (RGC) or liquid-tight flexible conduit with

appropriate fittings.

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5.2.2.4 Underground electrical conduit may be RGC or Schedule 80 PVC encased in

concrete (minimum 2-inch cover in all directions).

5.2.2.5 Contractor shall provide and install the required panelboard breakers for this

project to match the existing panel manufacturer and model type.

5.2.2.6 Contractor shall make all panel and upgrade water treatment plant

terminations.

5.2.2.7 The electrical trench depth will be a minimum of 18” plus the diameter of the

conduit.

5.2.2.8 Transitions from PVC/PE piping to RGC piping must be independently

supported.

5.2.2.9 All piping penetrations through concrete must be sleeved so that piping does

not come in direct contact with concrete material.

5.2.2.10 All materials will be supplied by the contractor.

5.2.3 Installation of Water Storage Tank

5.2.3.1 Removal of existing water storage tank.

5.2.3.2 Install the Glass Reinforced Plastic (GRP) storage tank following the final

design, layout, and instructions of the Contractor, on-site Factory

Representative and in accordance with the Submittal Drawings and the Final

Work Plan. The preliminary design includes:

5.2.3.2.1 System Control Center: All of the installed equipment will be

controlled/monitored by the existing main system controller

mounted at the adjacent pump house.

5.2.3.2.2 Construction of a new, one (1) new 100,000 liter water storage

tank.

5.2.3.2.3 Adding NSF 61 certified, electronic flow meter, which measures

in gallons, with low flow indicator as the water enters the pump

house, replacing the existing flow meter.

5.2.3.2.4 Replacing all piping and fittings with HDPE or PP-P fusion pipe

constructed on site.

5.2.4 Service Interruption

5.2.4.1 The contractor shall notify the COR in writing three (3) workdays prior to

any planned electrical or water outages.

5.2.4.2 The contractor must schedule work to maintain flexibility since interruptions

may not be granted on the date(s) requested.

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5.2.4.3 Electrical shutdowns and operation of electrical breakers and switches shall

be accomplished only by qualified personnel and upon the advance approval

of the COR.

5.2.4.4 Proper lockout/tag-out procedures shall be followed; the contractor shall

supply lockout/tag out materials.

5.2.4.5 Power shall be maintained to all operational loads (as determined by the

COR) during regular working hours.

5.2.5 Labeling

5.2.5.1 All equipment and circuits installed or altered as part of the SOW shall be

correctly labeled.

5.2.5.2 Circuit and panel numbers shall be labeled on service feed and lighting.

5.2.5.3 Labels shall be ANSI or TIA/EIA-606-A industry labeling standards

5.3 After Implementation

5.3.1 Start-up and Commissioning. Contractor will be available during start-up and of the

proposed water storage tank to assist Post Facilities staff with any issues related to

utility water supply and electrical service.

6 WARRANTY

6.1 The installing contractor shall provide a one-year installation warranty that includes all

materials, labor, and miscellaneous costs.

6.2 The contractor may seek reimbursement from the manufacturer or any other entity providing

warranties for the equipment installed, but the contractor must be the responsible party for

warranty repairs.

6.3 The contractor shall provide, at his cost, for onsite repairs within 72 hours of notification of

an operational problem or failure within the warranty period for the electrical or water

service systems installed under this Scope of Work.

7 POINTS OF CONTACT

7.1 CONTRACTING OFFICER: The Contracting Officer (CO) shall be Steve Siebert,

Supervisory General Engineer, OBO/CFSM/FAC/PS.

7.2 CONTRACTING OFFICER REPRESENTATIVE (COR) shall be the Embassy Facility

Manager.

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8 PROPOSAL SUBMITTAL: Proposal shall be submitted to the CO and COR shown above.

9 ATTACHMENTS:

9.1 Attachment #1: Existing Water Storage Tank – Plan View

9.2 Attachment #2: Existing Water Storage Tank – Photographs

END SOW

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ATTACHMENT 1

EXISTING WATER STORAGE TANK - PLAN VIEW

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ATTACHMENT 2

EXISTING WATER STORAGE TANK – PHOTOGRAPHS

Outlet pipe located at the bottom (back side of the tank)

Inlet Pipe Located on top (Back side of the tank)

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Outlet pipe located at the bottom (back side of the tank)

Right Hand Side of the Tank

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Left hand side of the Tank

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Top View of tank

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Top View of Tank

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Rear View of Tank

scope of work water storage tank ......tank and existing water treatment plant), per 2020 obo...

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