Draft PWS - Water Distribution System_CFAC.pdf

DRAFT PERFORMANCE WORK STATEMENT

WATER DISTRIBUTION SYSTEM INSPECTION AND

PREVENTIVE MAINTENANCE

FOR

COMMANDER, FLEET ACTIVITIES CHINHAE

1.0 INTRODUCTION

1.1. Water distribution system consists of an interconnected series of components such as pipes, storage facilities, and components that convey drinking water (including pumps and valves located throughout the distribution system). A preventive maintenance program can prevent problems by identifying the ongoing needs of current system. Taking action to meet those needs will enhance public health protection, improve water system’s reliability, and reduce the costs of maintaining existing water system. This performance work statement (PWS) addresses required inspection and preventive maintenance tasks and services to be provided for water distribution system to continue providing safe and potable water to each facility aboard Installation.

1.2. The Contractor shall provide support for Commander, Fleet Activities Chinhae (CFAC) by completing the tasks described in this PWS. This PWS provides the detailed description of tasks required for water distribution system of CFAC to supply potable water through existing water distribution system, which include inspection and preventive maintenance services for water storage tank, water meter, pressure-reducing valve (PRV) and monitoring equipment installed in Installation water treatment plant (WTP).

1.3. The Contractor shall furnish all necessary services, personnel, labor, facilities, materials, supplies, and equipment to perform the work described in this PWS. The Contractor shall provide adequate professional supervision and quality control to assure the accuracy, quality, completeness, and progress of the required work. The Contractor shall ensure compliance with all applicable federal, state, and local laws, regulations and policies including those of CFAC.

The most stringent laws and regulations take precedence. It is the Contractor`s responsibility to ensure actions and tasks required are managed and recorded in accordance with (IAW) the most current regulation, directive and/or policy. The reference list is provided in Section 2.

References.

1.4. The work described in this PWS shall be conducted in CFAC. The facility and equipment subject to inspection and preventive maintenance are described in Section 5 and 6 of this PWS.

2.0 DESCRIPTION OF TASKS

2.1. Project Management

The Contractor shall manage and control all work activities, including subcontracted services, associated with this PWS.

2.2. Meetings

2.2.1. The Contractor shall prepare an agenda for kick-off meeting and any follow up meetings.

The meeting agenda shall be provided electronically a week prior to each meeting.

2.2.2. During the meeting, the Contractor shall discuss the project scope of work and objectives, logistics, coordination requirements, project schedule, data/information needs, and potential obstacles, hazards, or conditions that would interfere with project completion.

2.2.3. The Contractor shall prepare and electronically submit meeting minutes within 3 working days after each meeting.

2.3. Summary of Required Tasks

This section outlines the tasks to be performed by the Contractor in the specific year of contract. The work items required in each year has been summarized in the following table.

Table 1. Work Items Required in Each Year

Task

PWS

Section Base Year

1st Option Year

2nd Option Year

3rd Option Year

4th Option Year

Concrete Water Tank

Interior Visual Examination 2.4.1.1 O O O O O

Tank Cleaning 2.4.1.3 O X X X X

Tank Disinfection 2.4.1.4 O X X X X

Water Level Transducer Inspection and Preventive Maintenance

2.4.1.5 O O O O O

Steel Water Tank

Interior Visual Examination 2.4.1.1 X X O X X

Exterior Visual Examination 2.4.1.2 O O O O O

Task

PWS

Section Base Year

1st Option Year

2nd Option Year

3rd Option Year

4th Option Year

Tank Cleaning 2.4.1.3 X X O X X

Tank Disinfection 2.4.1.4 X X O X X

Water Level Transducer Inspection and Preventive Maintenance

2.4.1.5 O O O O O

Cathodic Protection System Inspection, Testing and Preventive Maintenance

2.4.1.6 O O O O O

Packed Tower Aerator

Equipment and Packing Media Inspection

2.4.2.1 O O O O O

Packing Media Cleaning 2.4.2.2 O X X X X

Finished Water Meter Inspection and Preventive Maintenance

2.4.3 O O O O O

PRV Inspection and Preventive Maintenance

2.4.4 O O O O O

Equipment and Pumps in the Water Treatment Plant

2.4.5 O O O O O

Water Main and Hydrants Flushing 2.4.6 O O O O O

Distribution Valves 2.4.7 O O O O O

Fine Mesh Replacement 2.4.8 O O O O O

2.4. Detailed Work Description

2.4.1. Concrete / Steel Water Storage Tank

2.4.1.1 Interior Visual Examination

The Contractor shall conduct visual examination on interior walls, roof, appurtenances and embankment. All items that are seen in the water storage tanks and inspection items specified in (1) ANSI/AWWA D101-53, Standard for Inspecting and Repairing Steel Water

Tanks, Standpipes, Reservoirs, and Elevated Tanks for Water Storage; (2) UFC 3-230-02, Operation and Maintenance: Water Supply Systems; and (3) AWWA M42 Steel Water-Storage Tanks shall be inspected. The work included under this section shall consists of: (1) a field examination; and (2) a specific report upon the structure and appurtenances. The inspection work does not include repairs, except that, if vent screens, cotter pins or nut pins are found to be missing, the Contractor shall replace at once. The Contractor shall locate signs of potential and possible deterioration or corrosion, including rust stains, efflorescence, cracks, seepage, or spalling. The location and severity of the preceding signs of potential and possible trouble shall be recorded in color photographs and written record for comparison to future observation and shall be addressed in the inspection report stating if replacement or repair is recommended.

As water drainage from the tanks is 3-year requirement, annual internal examination shall be conducted without draining out water when the tanks are in service. For in-service internal inspection, the Contractor shall consider either an underwater evaluation performed by divers or a robotic inspection. The Contractor must conform to requirements of diving inspection and robotic inspection as specified in AWWA M42 Steel Water-Storage Tanks.

In the year that water drainage is required, Public Works Department (PWD) of the Installation, as property owner, shall have all water in the tank drained for the inspector before internal examination. If the wall and bottom of the tank is not exposed to inspector, the Contractor shall thoroughly wash out sediment before examination. Refer to Section 5.1.3 for the detailed requirement for tank cleaning.

2.4.1.2 Exterior Visual Examination

The Contractor shall examine tank exterior and roof for rust, corrosion products, loose scale, leaky seams, rivets and for condition of paint. Appurtenances, which include but are not limited to, ladders, walkways, guardrails, handrails, stairways, and risers, shall also be inspected for rust, corrosion, poor anchorage, missing pieces, general deterioration and damage. The examination, considerations for inspection and items to inspect shall conform to (1) ANSI/AWWA D101-53, Standard for Inspecting and Repairing Steel Water Tanks, Standpipes, Reservoirs, and Elevated Tanks for Water Storage; (2) UFC 3-230-02, Operation and Maintenance: Water Supply Systems; and (3) AWWA M42 Steel Water-Storage Tanks and included in the work plan.

All location and severity of the potential trouble shall be recorded in color photographs and written record and, specified in the inspection report. For condition of paint, the items to report are: (1) rough approximation of percent of rust area, (2) special locations of such areas, if segregated, and (3) character of such rust areas whether it is general or blotchy corrosion, loose paint or none. The extent and depth of pitting shall be determined and reported in accordance with ASTM D610-08, Standard Practice for Evaluating Degree of Rusting on Painted Steel Surfaces. The record of depth of pitting shall be as specific as practicable as to location, area affected; whether blotchy, deep, pinpoint or general corrosion. Pit depth gauge shall be used to obtain specific data.

2.4.1.3 Tank Cleaning

The Contractor shall wash out the tank with low-volume, moderate-pressure (2,400 psi [16.5 MPa]) pumps, firefighting equipment, or other means. The water shall be sprayed on all surfaces to remove as much residue as possible. Before tank wash-down, the Contractor shall consider whether sediment would cause sanitary sewer or stormwater drainage in blockage, or water pollution in and out of the Installation. If it would be concern, it may be desirable to isolate the sediment and washout water and properly dispose of it, instead of allowing it to enter a storm sewer or nearby streams. Care shall be taken to prevent large amounts of sediment from entering the tank piping. The Contractor shall discuss disposal of sediment and washed water with the property owner before tank cleaning. The components that could be dropped and remained in the tank during washout, such as cathodic protection anode and/or water level transducer, shall also be removed by the Contractor before the washout. After the tank has been cleaned, those that were removed from the tank shall be placed in satisfactory condition and be functional. Any equipment/material required for cleaning operation shall be clean and sanitary.

Care shall be taken to minimize the introduction of dirt or other foreign material. Following the washout, the vent screen, overflow screen, and any other screened openings shall be checked and put in satisfactory condition to prevent insects and other contaminants from entering the facility.

The planning, method and procedures of tank cleaning shall be adhered to AWWA M42, Steel Water-Storage Tanks and AWWA C652-19, Disinfection of Water-Storage Facilities.

2.4.1.4 Tank Disinfection

Before the tank is returned to normal service, the Contractor shall disinfect the tank in conforming to procedures of disinfection and verification specified in ANSI/AWWA C652, Standard for Disinfection of Water-Storage Facilities. The method of disinfection, forms of chlorine for disinfection, verification procedures to be used shall be specified in the work plan.

Verification procedures must include sampling and testing for the presence of coliform bacteria, chlorine residual, and acceptable aesthetic water quality.

2.4.1.5 Water Level Transducer Inspection and Preventive Maintenance

The level transducer has three components: (1) the solid rod electrodes that contact water at the different pump control depths in the tank, (2) the control relays that are located in the main pump control panel and (3) the electrical wiring between transducer and pump control panel relays. All components shall be inspected annually. The Contractor shall inspect the level transducer solid rods for corrosion and the stilling tube for debris that can foul is working. Any debris must be removed. The electrical relays shall be cleaned to ensure proper operation of well pump start/stop sequence at the established tank levels and test alarms at the abnormal high (High-High) and low (Low-Low) tank level settings. The inspection and maintenance works shall adhere to manufacturer`s installation and service manual (B/W Controls 1500 Series Induction Control Relays Installation and Service Manual).

2.4.1.6 Cathodic Protection System Inspection, Testing and Preventive Maintenance

All components of the impressed current cathodic protection system shall be annually inspected. The power source (rectifier), controls, anodes, wiring, and reference electrodes shall be examined and tested. Annual maintenance on power source (rectifier) shall include removing debris at the openings required for cooling, checking that all connections and wiring are secure and unaffected by corrosion, and inspecting the electrical grounding. Inspection of the system should include tank-to-water potential measurements to monitor the effectiveness of the system for the submerged surfaces of the tank. A calibrated and potable reference electrode should be used and the method of measurements should be in accordance with AWWA D104-17, Automatically Controlled, Impressed-Current Cathodic Protection for the Interior Submerged Surfaces of Steel Water Storage Tanks. The setting of rectifier shall be adjusted to maintain the optimal protective range. Checking the amount of oil in rectifier shall also be conducted and replace or add the oil as necessary in accordance with manufacturer’s manual. In addition, the Contractor shall inspect lightning protection and surge protection system to ensure proper operation and inspect anodes and rods for replacement and signs of defect. A report of the inspection, testing and maintenance shall include observed measurements, an evaluation and interpretation of the measurements, deteriorated parts identified during inspection, recommendations for continued performance of the system and any actions taken for correction and maintenance.

2.4.2. Packed Tower Aerator

2.4.2.1 Equipment and Packing Media Inspection

The Contract shall annually inspect air blower, screened exhaust at the top of aerator, and plastic media packing. The air blower shall be opened, inspected for clogging and cleaned, if required. The screened exhaust is a part at the top of tower. The Contractor shall examine the condition of it and clean to prevent entry of insects into tower. The plastic media packing the aerator shall also be annually inspected for the scale and biofouling.

2.4.2.2 Packing Media Cleaning

The cleaning of packing media, internal structures and piping inside the aeration tower shall be biennially conducted to remove the scale and biofouling. The Contractor shall apply an acid solution (3% HCl or 3% NaOCl) into the structure. The spent cleaning fluid shall be discharged to the sanitary sewer. Refer to Appendix A for the detailed procedures to clean the packing media.

2.4.3. Finished Water Meter Inspection and Preventive Maintenance

The Contractor shall disassemble the water meter, clean all the parts of the meter using solvent or mild biodegradable soap baths certified by NSF/ANSI 61 standards except for the propeller. The Contractor shall inspect meter head, the condition of pipe, straightening vanes, and the propeller, and calibrate the water meter. The inspection checklist shall be prepared in accordance with manufacturer`s manual and included in work plan before inspection. During service and disassembly, the complete metering assembly should be examined for wear and corrosion. The Contractor must ensure no leakage of water from the reassembled water meter before transition to normal service.

2.4.4. Pressure Reducing Valve (PRV) Inspection and Preventive Maintenance

The primary intent of this inspection is assessment of operation condition. The items subject to inspect include, but are not limited to, valve body, strainer, globe valve, pressure gauge, by-pass line and safety relief valve. The Contactor shall test and measure if the PRVs can drop down the water pressure to the set value. If the intended level of water pressure is not made, the Contractor shall report and provide root causes and recommended actions to correct.

In addition, the Contractor shall disassemble the valve, inspect the internal and external parts including the cleanliness of the filter installed upstream of the valve body, remove debris and foreign substances, adjust and lubricate if necessary. After inspection, the Contractor shall reassemble the valve and ensure that the intended pressure can be obtained before the valve is placed into normal service. The contractor shall pump out any accumulated water and clean the valve pit as necessary. The Contractor shall prepare inspection checklist in accordance with manufacturer`s manual and include in the work plan.

2.4.5. Equipment and Pumps in the Water Treatment Plant

The Contractor shall annually inspect the operation condition of water quality monitoring equipment, control panel, water pumps and oxidant generator in Water Treatment Plant (Bldg#802). Inspection and prevention maintenance required in this section, include but are not limited to, calibration of all water quality monitoring instruments, removal of foreign substances from the equipment and pumps, vibration test for each pump, inspection of plastic tubing condition. In addition, preventive maintenance recommended in manufacturer’s instruction/manual shall be conducted. Inspection and preventive maintenance procedures must conform to the manufacturer’s maintenance manual.

2.4.6. Water Main and Hydrants Flushing

The Contractor shall review, validate and, update, if necessary, the existing Installation water mains flushing plan. Flushing water mains should be conducted on an annual basis.

Planning, implementation and, follow-up action shall be conducted in accordance with UFC 3- 230-02, O&M: Water Supply Systems.

2.4.7. Distribution Valves

All gate valves should be physically cycled from full open to close and back three-quarter open on an annual basis. Valve inspection includes examining the condition of the valve box, vault and valve stem. The stem packing shall be lubricated by materials certified by NSF/ANSI 61 standards or any scale around the stem should be removed. Any accumulated water or debris in the valve pit shall be removed during the inspection. If distribution valves are not numbered, the Contractor shall give numbers to every distribution valve for easiness of reporting.

2.4.8. Fine Mesh Replacement

The Contractor shall identify piping or vents around water distribution facilities (e.g., storage tank, valves, hydrants, etc.) that are supposed to be protected from entering foreign substances into system/facility. The Contractor shall wrap parts of water distribution system with fine mesh. The fine mesh that already cap on piping or vents shall be examined its condition and be replaced if any part has been worn out.

3.0 FACILITY INFORMATION

3.1. Concrete Tank

Three (3) concrete tanks are subject to service required. The following table contains tank specifications. Figure 1 shows exterior and interior surface of concrete tanks.

Table 2. Concrete Tanks Specifications

Facility No.

Capacity (Gallons)

Exterior Interior Dimensions Purpose

809 20,000 Concrete, top exposed only

Fiber-reinforced plastic (FRP)

Diameter approx. 20 ft (6.1 m); Interior height approx.

11 ft 6 in. (3.5 m)

Potable Water

810 95,000 Concrete, buried

Fiber-reinforced plastic (FRP)

Approx. 33 ft 6 in. (10.2 m) x 33 ft 7 in. (10.2 m);

Interior height approx. 16 ft 7 in. (5 m)

Non-potable water

811 10,000 Concrete, exposed

Fiber-reinforced plastic (FRP)

Approx. 9 ft 9 in. (3 m) x 14 ft (4.3 m); Interior height approx. 9 ft 8 in. (3 m)

Non-potable water

Figure 1. Concrete Tank Exterior (Bldg#809 (Left-Top), Bldg#810 (Right-Top) and Bldg#811 (Left-Bottom)) and Interior Surface

3.2. Steel Tank

There are two (2) welded steel tanks containing treated water for distribution to each facility aboard Installation. Table 3 contains specifications of two (2) steel tanks required to be serviced. Currently, these tanks have been fully renovated in CY2020, including new cathodic protection system and new level transducer have been installed.

Table 3. Steel Tanks Specifications

Facility No.

Capacity (Gallons)

Exterior Interior Dimensions Purpose

800 125,000 Welded Steel Welded Steel Diameter approx. 30 ft (9.1 m); Shell height approx. 26 ft (7.9 m)

Potable Water

803 125,000 Welded Steel Welded Steel Diameter approx. 29 ft 6 in.

(9 m); Shell height approx. 27 ft (8.2 m)

Potable Water

3.3. Water Tank Level Transducer

All water storage tanks mentioned in Section 6.1.1 and 6.1.2 are equipped with water level transducer. The level transducer has three components: (1) the solid rod electrodes that contact water at the different pump control depths in the tank, (2) the control relays that are located in the main pump control panel and (3) the electrical wiring between transducer and pump control panel relays.

3.4. Cathodic Protection System

An impressed current cathodic protection (ICCP) systems are equipped with two (2) steel tank containing treated water. The ICCP system consists of high silicon cast iron anodes that are wired to a constant voltage rectifier located near the tanks. The rectifier forces current into the underwater anodes, through the water, and onto the steel plates of the tank. The anode system consists of twelve sacrificial anodes that hang from the ceiling inside the water tank. The cathodic protection system uses an oil-cooled rectifier to provide the impressed current to the anodes that protect the water tank steel structure against corrosion.

3.5. Packed Tower Aerator

The aeration tower is a cylindrical tank 457 mm (18 inches) in diameter and 3 meters (10 feet) in height as shown in Figure 2.

The air blower in Figure 2 has a capacity of 480 CFM at seven inches of water pressure to yield a 60:1 air to water ratio. The blower supplies the air into the tower and is programmed to activate when the Raw Water Pump turns on. The water enters at the top of the tower and flows downward. At the same time, the ABO CFM blower pumps air into the tower through the packing in the opposite direction. The ABO CFM blower is programmed to activate when the

Raw Water Pump turns on. The blower is interlocked with the Raw Water Pump, which activates based on the Treated Water Tank LWL and HWL level transducer signals. The blower automatically begins pumping air as the Raw Water Pump conveys water through the filtration and disinfection processes and into the Aeration Tower. The blower stops when the Raw Water Pumps deactivate.

The interior of aeration tower is packed with Nupac plastic media manufactured by Lanpac. The packing is supported by a “packing support plate” that is fabricated into the tower between the packing section and the air injection section as shown in Figure 2 and Figure 3.

Figure 2. Aeration Tower Schematic (Left), Exterior of Aeration Tower (Middle) and Air Blower Equipped with Aeration Tower (Right)

Figure 3. Packing Media and Packing Support Plate

3.6. Finished Water Meter

Finished water from the Treated Water Tank is pumped by the Treated Water Transfer Pumps to the High Elevation Water Tanks. The finished water travels in a 150-mm (6-inch) diameter pipe that connects to a 200-mm (8-inch) diameter PVC pipe. In the WTP, a flow meter registers the amount of finished water as it passes through the 150-mm (6-inch) diameter pipe.

The flow meter is a straight-reading type that is similar to a car odometer as shown in Figure 4.

Figure 4. Flow Meter

3.7. Pressure Reducing Valves

Pressure reducing valves (PRV) control water pressure in the water distribution system.

Because of the hilly terrain at CFA Chinhae, water main pressure can be excessively high at the lower parts of the base unless PRVs are used to modulate downstream pressures.

There are three pressure zones regulated by PRV vault stations. Locations are PRV-A at Cherry Blossom Lane across Building 715, PRV-B at the grounds above Building 796, and PRV- C at the intersection of Kyong Buk Street and Comm Parkway. The valves maintain a constant downstream pressure regardless of fluctuating demand. Each PRV, as shown in Figure 5, is a globe design valve controlled with a diaphragm assembly. The valves contain a resilient disc that is held by a disc retainer and forms a tight seal with the valve seat when pressure is applied above the diaphragm flow. The open, closed, and in-between positions are controlled by small pilot valves and pressures sensed upstream and downstream of the valve. The differential pressure between the upstream and downstream readings is sensed by an orifice plate.

Figure 5. Pressure Reducing Valves (PRVs)

3.8. Water Treatment Related Equipment and Pump

Table 4 provides a list of equipment operated in water treatment plant (Bldg#802) which requires inspection and preventive maintenance as described in Section 5.

Table 4. Equipment List in Water Treatment Plant

Item Manufacturer Model No.

Raw Water Pumps (2 EA) Hyundai Wilo MVI 3602 Treated Water Pumps (2 EA) Hyundai Wilo MVI 3605-3/16/E Chlorine Residual Analyzer Yokogawa FC400G Turbidity Meter HACH 1720E Turbidimeter pH Analyzer HACH PC1R1 On-site Oxidant Generator MIOX RIO ZUNI 1.0

3.9. Distribution Valves

The following table provides number of water valve to be serviced by this work analysis report.

Table 5. Number of Valve in Distribution System

Main Line V/V Drain V/V Water Plant V/V

84 EA 15 EA 12 EA

3.10. Future Water Treatment Plant Relocation

The water treatment plant will be relocated within the contract period, and any modifications to the scope of the contract will be made to accommodate changes related to the new water treatment plant component, water lines, and valves. No significant changes to the work scope are expected, except for alterations in the number of concrete water tanks.

Table 6. Expected Changes Related to the New Water Treatment Plant

Component Existing WTP New WTP

WTP Equipment / Pumps Will have same process

Raw Water Tanks 1 EA (95,000 gal) 2 EA (50,000 gal each)

Treated Water Tank 1 EA (20,000 gal) -

Auxiliary Tank 1 EA (10,000 gal) -

Steel Tank 2 EA (125,000 gal each) 2 EA (125,000 gal each)

Water Lines Will be rearranged to connect new WTP

Distribution Valves Total number of valves will be changed, but no significant changes are expected

The completion of the new water treatment plant relocation is scheduled for 2025 and the scope modification is expected to be made for 1st option year of this contract.

4.0 CONTRACTOR QUALIFICATION

The Contractor shall have the necessary equipment and supplies to complete the tasks required for this work. The Contractor shall employ, either directly or through subcontract, personnel adequate in numbers, skill, and qualifications to accomplish the work required in conformance with this PWS and subsequent scope of work.

A qualified English-speaking project manager shall be available to supervise all work specified under this contract. The Project Manager shall have a Bachelor of Engineering and minimum two (2) year experience in the field of water distribution system design, evaluation, operation, maintenance, and inspection. The Contractor shall assign personnel who are qualified to perform the work required under this PWS, and who will faithfully follow the law and regulations of the USFK and ROK pertaining to the tasks. The following are minimum qualifications of personnel who will work on the project.

To demonstrate requisite experience and expertise, the Contractor shall submit to the Contracting Office, information supporting personnel qualifications. Information should include a short descriptive title of the project, project location, agency, or organization for which the work was performed, and role in project. This information should demonstrate that the person is qualified to conduct the specific task(s) under this PWS.

If, during the performance of this contract, the Contractor must utilize key personnel other than those names submitted for this contract, such substitution shall not be made without prior written approval of the Contracting Officer (KO) or his/her authorized representative (COR). If key personnel are performing unsatisfactorily, the KO or COR may direct replacement of such personnel as appropriate.

4.1. Experience Requirements

The Contractor or its subcontractor must fully understand the requirements of this work.

The Contractor or its subcontractor must have at least three (3) projects within the past 5 years’ experience in the inspection of steel structures or interior and exterior surface of steel water storage tank. The Contractor must have experience in water distribution system maintenance which include but are not limited to, (1) ground or elevated steel water storage tank inspection/maintenance and cleaning; (2) maintenance, replacement or repair of cathodic protection system and electrical sensor equipped in water storage tank; and (3) drinking water treatment plant/network system inspection and maintenance.

4.2. License / Certification Requirements

It is highly recommended/preferred to conduct the interior and exterior surface and structure inspection of steel and concrete water storage tank by personnel who is accredited by NACE (The National Association of Corrosion Engineers) International (or ROK relevant licenses/certifications) regarding corrosion or coating matter.

4.2.1. NACE (The National Association of Corrosion Engineers) International CIP (Coating Inspector Program) Level 2/3 or SSPC (The Society for Protective Coatings) CCI (Concrete Coating Inspector Program) Level 2.

4.2.2. NACE (The National Association of Corrosion Engineers) International CP (cathodic Protection Program) CP 2/3/4.

4.2.3. Registered US professional engineer with expertise in inspection services, specifically in the inspection of steel structures, and possesses at least five years of relevant experience.

4.2.4. The field inspection team shall conduct the inspection under the supervision of PE of 4.2.3.

5.0 REFERENCES

a. UFC 3-230-02, Operation and Maintenance: Water Supply Systems

b. AWWA M6, Water Meters – Selection, Installation, Testing, and Maintenance

c. AWWA M42, Steel Water-Storage Tanks

d. AWWA M44, Distribution Valves: Selection, Installation, Field Testing, and

Maintenance

e. ANSI/AWWA D100-11, Welded Carbon Steel Tanks for Water Storage

f. ANSI/AWWA D115-17, Tendon-Prestressed Concrete Water Tanks

g. ANSI/AWWA D102-17, Coating Steel Water Storage Tanks

h. ANSI/AWWA D104-17, Automatically Controlled, Impressed-Current Cathodic

Protection for the Interior Submerged Surfaces of Steel Water Storage Tanks

i. ANSI/AWWA C652-19, Disinfection of Water Storage Facilities

j. ANSI/AWWA D101-53 (R86), Standard for Inspecting and Repairing Steel Water

Tanks, Standpipes, Reservoirs, and Elevated Tanks for Water Storage

6.0 DELIVERABLES AND MILESTONES

6.1. Meeting Agenda, Minutes, and Monthly Progress Report

The Contractor shall prepare and submit meeting minutes within 3 working days after each meeting with the property owner. The meeting agenda shall be provided a week prior to each meeting. The meeting minutes shall include all items discussed during the meeting and attendance roster. The COR and property owner will review the meeting minutes provided by the Contractor. It might be returned to the Contractor, if any revision would be required. No hard copy submittal is required.

The Contractor shall submit monthly (unless otherwise specified) status/progress reports to the COR summarizing all activities conducted under this contract. The monthly reports shall be used to review and evaluate the overall progress of the projects, along with any existing or potential problem areas. The monthly reports shall include a summary of the events that occurred during the reporting period, discussion of performance, identification of problems, proposed solutions, corrective actions taken, and outstanding issues. The monthly reports shall also include project schedule status. These reports shall be submitted electronically.

6.2. Work Plan (WP) / Accident Prevention Plan (APP)

The Contractor shall prepare and submit draft version of project WP and APP within 30 calendar days after the project kick-off meeting. The draft plans will be reviewed by the COR and the property owner for 14 calendar days, and returned to Contractor, if any revision would be required. The WP shall contain, but not limited to, facility/equipment information to be inspected under this Contract, a list of industry standards appliable to each facility/equipment, equipment to be utilized, and inspection checklist for each examination and preventive maintenance. The WP shall include a Project Planning Chart (PPC) to the COR for approval.

The PPC shall detail the project schedule and status through the use of Gantt charts, which shall depict percent complete for each project and task. The PCC shall be submitted in electronic or hard copy formats as appropriate.

The Contractor shall develop and implement overall Contract and task specific (as applicable) APPs in accordance with its Safety and Health Program and the guidelines outlined in the current version of EM 385-1-1 (https://www.usace.army.mil/Missions/Safety-and- Occupational-Health/Safety-and-Health-Requirements-Manual/). The Contractor shall prepare an overall APP that is specific for all sites; a Site Safety Health Plan (SSHP) shall be included in the APP as an attachment. Supplement the overall APP with APPs focused on specific work items as they arise.

When requested, the Contractor shall prepare WP presentation materials and provide briefings to the project delivery team (PDT). The Government PDT will consist of USACE PM, COR, PWD personnel of the CFAC.

6.3. Interim Inspection Report

The Contractor shall submit interim inspection reports in .pdf format within 30 calendar days after the completion of each facility/equipment categorized in Section 3. The interim inspection reports shall include facility/equipment inspected, a summary of performance and potential/possible troubles on facility/equipment identified during inspection and preventive maintenance, the severity of observation, root causes of problem, proposed solution to correct or rehabilitate. If parts replacement is required, cost estimate of part supply with delivery and labor hours should be provided.

6.4. Draft Integrated Inspection Report

The Contractor shall prepare a draft integrated inspection report at 90% of the overall project progress and submit electronic copy for the Government review. The Government will have 14 calendar days for draft report review. The report shall include all the activities conducted during the contract period, findings during inspection and maintenance of the water distribution system, any significant deficiencies identified, and conclusions and recommendations for the system improve. The draft report that simply combines the midterm inspection report will not be acceptable. No hard copy submittal is required.

6.5. Final Integrated Inspection Report

The final report shall contain all missing information identified by the Government during the review period. The Contractor shall submit final version of inspection report within

21 calendar days from the Government review comments. The electronic copy and three (3) hard copies of the final reports shall be submitted to the COR. When requested, the Contractor shall prepare presentation materials and provide briefings regarding ‘Inspection and Maintenance Result on the Water Distribution System’ to the project delivery team (PDT).

The final report shall be printed on letter size white paper and bound along the left-hand margin. Stapling shall not be acceptable. Figures, maps, and photographs sized up to 11 x 17 inches shall be bound into the report. Maps or figures larger than 11 x 17 inches may be placed in pockets at the end of the report inside the back cover. The final reports shall have color photographs or high resolution (>600 dpi) color prints. The Contractor shall submit three (3) compact disk (CD) or digital versatile disk, read-only memory (CD/DVD-ROM) containing digital data including photos and/or video recorded during contractual performance.

6.6. Out-Brief Presentation

The Contractor shall prepare and deliver an annual out-brief presentation of all tasks completed to CFAC. Summary slides shall be prepared using MS Powerpoint®. The duration of the summary presentation shall not exceed 30 minutes and the Contractor shall be available to answer questions for a period of 15 minutes following the presentation. The Contractor’s presenter must be the technical lead or PM for the project. The date and time of the meeting will be scheduled upon receipt of the final integrated inspection report and will be held at CFAC.

6.7. Project Specific Technical Deliverables

The Contractor shall prepare and submit to the USACE COR technical reports as specified by each project as indicated in this section.

Table 7. Project Deliverables

Submittal Type Hard Copy Electronic

Meeting Agenda / Minutes 0 1 (email)

Draft Work Plan / APP 0 1 (email)

Final Work Plan / APP 3 3 (CD)

Monthly Status/Progress Report 0 1 (email)

Interim Inspection Report 0 1 (email)

Draft Integrated Inspection Report 0 1 (email)

Final Integrated Inspection Report 3 3 (CD)

Out-Brief Presentation 0 1 (email)

Text and tables of all plans and reports shall be provided in an electronic format readable by Microsoft Word (MS Office 365 ProPlus compatible) and Portable Documents (PDF).

Spreadsheets shall be readable by MS Excel (MS Office 365 ProPlus compatible). Photographs shall be provided in *.bmp and *.gif, *.tif or *.jpg format together with a table of contents and description. Maps shall be provided in *.jpg, *.pic or *.dgn. Video shall be digitized and in *.mov or *.avi format. Figures and maps shall be embedded in the report or hyperlinked to the text of the plan or report. All the final plans and reports shall be submitted on a project Compact Disk (2 copies) with the final hard copy submittals. The contractor shall ensure all final versions of the reports be printed on 8.5 X 11 inches letter size white paper and bound along the left hand margin; stapling shall not be acceptable. Figures, maps, and photographs sized up to 11 X 17 inches shall be bound into the report.

7.0 PERIOD OF PERFORMANCE

The Contractor shall immediately begin performance upon receipt of notice of award of this Contract. The period of performance (PoP) for all the tasks addressed in this PWS is 12 months from contract award date (if NTP not required). Option period(s) will be 12 months each after completion of the base year. Delivery schedule for this contract is as follows:

Table 8. Delivery Schedule

Year Performance Period

Base Year 12 months (can be 9 months) from date of contract award

1st Option Year 12 months commencing from the day following the last day of the base period

2nd Option Year 12 months commencing from the day following the last day of the option 1

3rd Option Year 12 months commencing from the day following the last day of the option 2

4th Option Year 12 months commencing from the day following the last day of the option 3

The Contract shall conform to the following project schedule.

Table 9. Project Schedule

Task Duration

(Calendar Days) Days from NTA (Calendar Days)

Work Progress Schedule (%)

Notice to Award (NTA) 0 0 0

Kick-off Meeting 14 14 5

Submit Draft Project WP / HSP /

AHA

28 42 10

Government Review on WP / HSP

/ AHA

14 56 -

Submit Final Project WP / HSP /

AHA

14 70 15

Task Duration

(Calendar Days) Days from NTA (Calendar Days)

Work Progress Schedule (%)

Conduct Inspection and Prevention Maintenance

196 266 70

Submit Draft Integrated Inspection Report

42 308 90

Government Review 28 336 95

Submit Final Report 14 350 100

Performance Work Statement for CFAC Water Distribution System Inspection and Preventive Maintenance

Appendix A

Cleaning Procedures and Packing Media in Aeration Tower

(CFAC)

APPENDIX A

Packing Media Maintenance. As water passes through the Aeration Tower, oxidized minerals (scaling) and biological growth (biofouling) accumulate on the media. Per Aeration Tower O&M Manual, cleaning procedures are as follow.

An acid solution (3% HCl or 3% NaOCl) should be applied into the structure. The following procedure should be used to clean the packing media:

1. Close the 50-mm (2-inch) gate valve on the treated intake line into the Aeration Tower.

2. Close the 150-mm (6-inch) gate valve on the discharge line from the Aeration Tower.

3. At the control panel for the blower, select the “OFF” option using the selector switch to turn off the blower.

4. At the System Control Panel, select the “HAND” option for the Raw Water Pump using the selector switch. This will allow the water system operator to manually control the Raw Water Pump. Turn the selector switch to the “OFF” position after allowing the Raw Water Pump to transfer water into the tower for about three minutes at a flow rate of 100 gpm. 1,116 Liters (295 gallons) of water should be used to fill the tank. This value was calculated based on the volume of the tower up to the packing media fill line (2 feet in diameter, 12.5 feet high). The packing media will be completely submerged with this volume.

5. Using a ladder, open the top inspection port. The proper fall protection safety measures must be used when accessing the inspection port.

6. Install a temporary pump to transfer the acid solution (3% HCl or 3% NaOCl) into the top of the tower at the inspection port opening.

7. Add the acid solution in increments. Using the tap and drain valve, take samples of the water inside the tower as the acid solution is being added. Use pH testing strips to determine the pH level of the water after each increment of acid solution is added.

8. Once the pH level of the water inside the tower is below 1, allow the solution to remain in the tower for a minimum of four hours.

9. After a period of four to 24 hours, the water system operator should attach a flexible hose and a drain valve at the tap location. The flexible hose will run from the tower to the storm drain located near the main gate by the WTP. Open the drain valve to allow the water and solution inside the tower to drain completely.

10. Open the inspection port. Install a temporary pump to drain the remaining water and acid solution sitting in the bottom of the tower. Close the inspection port.

11. At the System Control Panel, select the “HAND” option for the Raw Water Pump using the selector switch. Allow the Raw Water Pump to continue running to flush out any remnants of the acid solution within the tower.

12. The water system operator should take samples of the water that is flushing the tank at the drain. Once the pH level of the water reaches a neutral level (pH reading of 7), the water system operator can shut the Raw Water Pumps off (select the “OFF” option using the selector switch at the System Control Panel).

APPENDIX A

13. After the Raw Water Pumps are turned off, allow the water to drain completely from the tower. Close the drain valve at the tap.

14. Open the inspection port. Use the temporary pump to drain any remaining water in the bottom of the tower. Close the inspection port.

15. Remove the flexible hose from the tap and drain valve. Store the hose properly for future cleanings.

16. Using a ladder, close the top inspection port. The proper fall protection safety measures must be used when closing the inspection port.

17. Open the 50-mm (2-inch) gate valve on the treated intake line into the Aeration Tower.

18. Open the 150-mm (6-inch) gate valve on the discharge line from the Aeration Tower.

19. At the control panel for the blower, select the “AUTO” option using the selector switch to return the blower to its original settings.

20. At the System Control Panel, select the “AUTO” option for the Raw Water Pump using the selector switch.