Attachment 1 - RFQ 19SN1025Q0018 SOW.pdf

Attachment 1

STATEMENT OF WORK

1. PERFORMANCE WORK STATEMENT

The Contractor shall provide all tools, labor and material to clean and test the potable water stored in the following water tank in compliance with the PUB’s regulations for water storage tanks at the Embassy.

Location Dimension

Chancery 5000 mm L x 3000 mm W x 2500 mm H

The U.S. Embassy in Singapore requires the Contractor to chemically treat the drinking water storage tanks and perform water analysis monthly; and also to clean and disinfect the drinking water storage tanks and perform water analysis annually for PUB certification.

Services will be performed in accordance with the Performance Work Statement attached as Attachment 1. Services are considered successfully performed only when PUB’s certified approval is obtained. The results will be documented in a Service Report to be submitted to the COR for review.

During performance of this service, the Contractor must ensure that the water supply to the building is not disrupted. The existing water tank is compartmentalized into 2 sections.

Maintenance work must be conducted separately for each compartment so as to prevent disruption of water supply to the building.

2. DELIVERY AND HOURS OF PERFORMANCE

The Contractor shall schedule all routine maintenance work during normal working hours which are defined as 9:00 a.m. to 4:30 p.m., Monday through Friday, excluding American and local public holidays, unless approved in advance by the Contracting Officer's

Representative (COR).

The Contractor shall coordinate with Facility section (Halim Abdul Rahman – email:

AbdulRahmanH@state.gov; office: +65 6476 9236 and Hazel Tan – email:

TanH@state.gov; office: +65 6476 9140) to schedule the monthly and annual servicing.

The Contractor shall deliver the following items under this order:

Description Quantity Delivery Date Deliver To

Monthly service report for dosing system

12 per year After service COR

Site test reports for 6 individual water samples 72 per year After service COR

Reports from accredited laboratory bacteriological test 12 per year After service COR

Reports on inspection of storage tank after annual inspection, cleaning and disinfection

Once a year After service COR

PUB approval and certification after annual inspection, cleaning and disinfection of storage tanks

Once a year After service COR

The Contractor shall provide the following on-site service for the potable water system:

1. Supply and dose chemicals (using Zinc Orthophosphate as the corrosion inhibitor and

Sodium Hypochlorite as the bacteria controller) to maintain the potable water system at the Embassy within given control limits. As the controls, standards, practices, government regulations, resources and site-specific conditions may change, it will be necessary for the

Contractor to make such changes in the program/product selection when deemed necessary.

2. The Contractor must provide a service representative to visit the site to conduct monthly checking on the working conditions of the chemical dosing system. He must ensure the availability of the dosing chemicals on site, and make adjustments to the chemical concentration or dosing pumps, when necessary, to ensure that the following control limit parameters are met.

3. During each site visit, the Contractor’s representative must conduct site test on four water samples from separate outlet points of the potable water system for the following selected parameters.

Description Control Limits pH 7.0 – 9.0

‘M’ Alkalinity 10 - 50 PPM

Chlorides 5 - 50 PPM

Total Hardness 20 - 100 PPM

T.D.S. 60 - 250 PPM

Free Chlorine <0.5 PPM

The results will be documented within the relevant Service Report (containing the control limits), corrective action identified/executed (if any). A copy of the Service Report will be submitted for review to the COR after acknowledgement for future reference/actions.

mailto:AbdulRahmanH@state.gov mailto:TanH@state.gov

4. Monthly laboratory test on water samples. The Contractor must also collect water sample for off-site test at the Contractor’s or an accredited laboratory for the following water test parameters and control limits:

Description Control Limits pH 7.0 – 9.0

‘M’ Alkalinity 10 - 50 PPM

Chlorides 5 - 50 PPM

Total Hardness 20 - 100 PPM

T.D.S. 60 - 250 PPM

Free Chlorine <0.5 PPM

5. In addition, the Contractor shall collect one drinking water sample and send to an independent, accredited laboratory monthly to conduct standard bacteriological tests. In the event that bacteria level exceeds the control limits as stipulated by Public Utilities

(Water Supply) Regulations 2002, the Contractor shall inform the COR and conduct disinfection where appropriate. The Contractor shall send the original laboratory testing report to the COR.

Annual Inspection /Cleaning /Disinfecting/ and Certification of Water Tank at the Embassy.

6. Procedure on Inspection /Cleaning / & Disinfecting Drinking Water Storage Tanks.

a) Prior to the commencement of cleaning work, the Contractor must check the integrity of the tanks and valves against leaks or signs of deterioration. He/she must report any leak encountered and submit proposal for its repair. Signs of deterioration on the condition of the tanks must be reported and shown to the

Embassy’s representative.

b) The Contractor must drain each tank and inspect the hatch and entry ladder, if present, for integrity and safe entry. He/she must implement all confined space entry requirements before allowing anyone to enter the tank.

c) The Contractor must thoroughly clean the water tank by scrubbing all its interior sides with a new nylon brush and fresh water, and remove all resulting residue. The use of chemicals or cleaning materials containing chlorine such as bleach or any hazardous materials is not allowed due to the significant risks posed to workers.

The workmen must take all safety and hygienic precautions during the course of this work. They must also take precautions to prevent physical damage to the tanks and other ancillary equipment.

d) Conduct structural inspection on the interior of the tank and report any major or impending major deficiencies to the Embassy’s representative. Conduct minor repair or adjustment work e.g. securing ball valves, adjustment on ball valve arm, etc.

e) Following any maintenance measures necessary, the interior walls, top and floor should be rinsed with fresh water. Subsequently, any remaining residue and water must be removed.

f) For drinking water storage tanks, add 0.13 lb. or 59 grams of dry calcium hypochlorite (granules, pellets, or tablets must be broken or crushed to sizes not larger than 6 mm or ¼ inch) per 1,000 U.S. gallons or 3785 liters of volume in the tank prior to filling the tank with water to produce 10 mg/L (ppm) chlorine concentration. The material should be located so that inflowing water will ensure a current of water circulating through the calcium hypochlorite to obtain good mixing. It should be only placed on dry surfaces unless adequate precautions are taken to avoid exposure to toxic chlorine gas liberated upon contact with water. No one should be inside the tank during this operation. Fill the tank with fresh water and allow it to stand for 24 hours.

g) After 24 hours, drain the chlorinated water from the tank after ensuing that the drained water will not damage environment or property such as grass lawn, asphalt or paved areas, etc. Fill the cleaned tank with fresh water.

Note:

Cleaning, disinfection, water analysis and certification must be attained on one partitioned compartment of the tank before commencement of the same work procedure on the remaining compartment.

7. Water Analysis

a) Collect water in a sterilized container kit and send for potability analysis.

b) The potability test may include but not be limited to the chemical and physical characteristic of:

Color (Hazen unit); turbidity (NTU); PH value; conductivity, taste; odor; nitrate (as

NO3); fluoride (as F); total dissolved solid; total alkalinity (as CaCO3); total hardness (as CaCO3); chloride (as Cl); Sulphate (as SO4); Phosphate (as PO4);

silica (as SiO2); iron (Fe); Manganese (as Mn); copper (as Cu); aluminum (as Al);

and the bacteriological characteristic of:

total coliform bacteria (counts/100 ml, 35 degrees C, 24 hours)

The above list of determination for water analysis is only a guide. The actual list of determination must comply with the requirement for submission of Public Utilities

Board (PUB) water storage tank approval and certification. The Contractor will be responsible for compliance to additions, changes or modifications, if any, by the

PUB on the list of determination required during the course of this contract.

8. Submission to PUB for approval and Certification.

a) The Contractor shall obtain a licensed water service plumber to inspect, and where necessary, to clean and disinfect the water storage tank and certify that:

i) the water storage tank is fit and safe for the storage of water for human consumption;

ii) the water contained in the water storage tank is free from contamination or pollution and that there is no likelihood of such contamination or pollution;

iii) water samples taken from the tank pass the appropriate chemical and bacteriological examinations;

iv) the water storage tank is properly maintained; and

v) there is no leakage and no likelihood of leakage in the water service installation, including the water storage tank.

b) The Contractor must include all other work necessary to comply with regulation

14(1) of the Public Utilities (Water Supply) Regulations 2002 or the latest relevant requirement, and complete and submit the Inspection and Certification of Water

Storage Tank by Licensed Plumber form for successful approval by the local authorities.

9. The Embassy’s average monthly consumption is approximately 1,400,000 liters.