Attach_3__PWS_revised_on_15_May_2025.docx

iPERFORMANCE WORK STATEMENT

FOR

Heating, Ventilating and Air Conditioning (HVAC) Duct, Air Handler Unit (AHU), Ventilation, and Dryer Duct Cleaning Service

14 May 2025

Part 1 General Information

1. General Information: This is a non-personal services contract to provide cleaning service on dryer duct and HVAC duct system in various facilities on Osan Air Base, Republic of Korea. The Government will not exercise any supervision or control over the personnel rendering the services performing the services herein either by the contract’s terms or by the manner of its administration. Such service contract providers shall be accountable solely to the contractor who, in turn, is responsible to the Government.

1.1. Background: Osan Air Base is experiencing environmental degradation when it comes to indoor air quality due to lack of adequate cleaning of heating and cooling air ducts which have accumulated various pollutants causing health risk to the occupants. Additionally, these accumulated contaminants in ductwork system are causing higher utility cost due to aggravated efficiency of the air/heat flow and causing higher fire hazard in the HVAC system as well as dryer duct system. These constraints necessitate service on HVAC/dryer duct system on Osan AB.

1.2. Description of Service: The contractor shall provide all personnel, labor, supplies, management, supervision, tools, equipment, materials, transportation, and other items necessary for services to clean HVAC ducts system, Air Handler Units (AHU), Ventilations, and dryer duct system in various facilities in Osan AB. The type of cleaning must ensure compliance with local laws, regulations, SOFA agreement, NADCA Standard (for Assessment, Cleaning, and Restoration of HVAC systems), codes, technical manuals, Air Force PMTL (Preventive Maintenance Task List), manufacturer/installer’s instructions and recommendations, and acceptable commercial practices. The contractor shall be provided with a Mechanical Plan of each facility requiring cleaning service. This plan will contain the best information possible on the existing condition of the ductwork layout, diffusers, and air handler units in each facility. There are approximately 13,690 SF (by floor area) dryer duct required to be cleaned quarterly, the list of the facilities is in the PWS Para. 6.3. Technical Exhibit 3. Cleaning of the HVAC systems will be on an as scheduled bases annually para paragraph 5.2. The number of items to be cleaned are reflected in paragraph 6.4 of Technical Exhibit 4. The COR shall be the final approver of the cleaning schedule provided by the contractor and no work will start until approved by the COR.

1.3. Period of Performance: A performance period is a period to complete each project indicated on the work schedule that the contractor set up as in the PWS Para. 5.1. Work Schedule. The performance period includes the time for contractor to procure materials, mobilization, quality control and on-site work. Each performance will be determined and coordinated during the joint site survey in accordance with this PWS Para. 5.2. A typical performance period ranges between 5 days to 60 days depending on the size of the requirement.

1.4. Quality Control Program (QCP): The contractor shall develop and maintain an effective quality control program to ensure services are performed in accordance with this PWS. The contractor shall develop and implement procedures to identify, prevent, and ensure non-recurrence of defective services. The contractor shall submit a QCP that addresses the various elements of the Performance Requirements Summary table (PRS) (see the PWS Para. 6.1.) as well as various requirements described in the PWS. The contractor’s quality control program is the means by which it assures itself that its work complies with the requirement of the contract. The contractor is required to submit a Quality Control Program within thirty (30) calendar days after the contract award date (Contract Data Requirements List (CDRL) #1). An updated copy of the contractor’s plan shall be provided to Contracting Officer Representative (COR) as changes occur. For any changes to the original QCP the contractor shall receive the COR’s acceptance in writing of any proposed change to its QC system.

1.5. Quality Assurance: The Government will evaluate the contractor’s performance under this contract in accordance with the Quality Assurance Surveillance Plan (QASP). This plan is primarily focused on what the Government must do to ensure that the contractor has performed in accordance with the performance standards. It defines how the performance standards will be applied, the frequency of surveillance, and the minimum acceptable defect rate(s). The contractor shall be supportive of any inspection methods carried out by the COR to verify the contractor’s work.

1.5.1. Methods of Quality Assurance Surveillance: The COR shall use the surveillance methods listed below in the administration of the QASP.

1.5.1.1. 100% Inspection: This is an inspection method whereby all outputs are monitored. This method provides the best indication of the contractor performance and the most documented basis for determining contract payment actions. However, it requires extensive COR resources, and therefore, is not practical for most service requirements. 100% inspection is preferred when the PWS requirement is so critical that nonperformance would pose a direct risk to the safety of personnel or property, or when the work occurs infrequently, and the output population is small. The COR can also use this method when he/she determines that verification of the contractor’s performance is required.

1.5.1.2. Random Sampling: When a service is performed relatively frequently, and a statistically valid sample can be selected for audit. The most appropriate method for frequently recurring tasks. Random sampling is a means of evaluation by observing or inspecting some part (a sample), but not all, of a population or lot of the contract requirements to assist the Government with determining whether standards set forth in the contract have been met.

1.5.1.3. Periodic Sampling: This method, sometimes called “planned inspection”, consists of the evaluation of tasks selected on other than a 100% or random basis. It may be appropriate for tasks that occur infrequently, and where 100% inspection is neither required nor practical. A predetermined plan for inspecting part of the work is established using subjective judgement and analysis of agency resources to decide what work to inspect and how frequently to inspect it.

1.5.1.4. Customer Feedback: Not necessarily a valid method of surveillance, but a good indicator for areas surveillance should be conducted or intensified. The COR may design a customer survey questionnaire to be used as an essential part of a well-publicized customer complaint program. In time of resource constraints, the use of customer surveys should only supplement other surveillance efforts and be analyzed by surveillance personnel trained in validating customer complaints. Customers should be made aware of minimal contractor performance requirements to be sure that customer responses to surveys are valid indicators of actual contractor performance. The COR must investigate each customer complaint and validate the accuracy before any action is taken.

1.5.2. Non-conforming Services: When a contractor’s performance is identified as unsatisfactory (e.g., does not meet contract PWS requirements of the specific task and/or work schedules and/or timeframes), it is considered a non-conformance. The contractor shall reply within the specified timeframe upon receipt of a non-conformance report (NCR)/Corrective Action Request (CAR) from the COR or KO. The criteria for the type of action that will be taken is defined in the PWS Para. 6.1. Non-conformance shall be classified in one of three categories:

1.5.2.1. Level I (Minor) Non-conformance: Is defined as a departure from established standards having little bearing on the effective use or operation of the services. Minor non-conformance usually can be corrected by the contractor within a short timeframe, where no further corrective action response is necessary and can be issued by the COR to the contractor either through a verbal or written NCR/CAR. Minor non-conforming services shall be re-performed within a specified timeframe at no increase in contract price. If minor non-conformances are recurring or re-performance is not completed in full and within the specified time a Level II non-conformance may be issued to the contractor by the KO.

1.5.2.2. Level II (Major) Non-conformance: Is defined as a non-conformance, other than critical, that is likely to result in failure of services, or to materially reduce the usability of the services for their intended purpose, or it is a recurring minor non-conformance, or a non-responsive contractor indicating a trend or failure of the contractor’s quality control. Major non-conformance shall result in the issuance of a written NCR/CAR from the KO to the contractor requiring a response by the contractor by a specified timeframe identifying the reasons for the unsatisfactory performance, corrective actions(s) taken, and date resolution has/will occur, and procedures to preclude recurrence of unsatisfactory performance. The KO may also reduce the payment to the contractor in accordance with the performance requirements summary (PRS) or reduce payment to reflect the value of the services not performed if re-performance is not possible or may have the identified non-conforming service performed by some other means and charge the contractor for any related cost incurred.

1.5.2.3. Level III (Critical) non-conformance: Is defined as a non-conformance that is likely to result in hazardous or unsafe conditions for individuals using, maintaining, or depending upon the services; is likely to prevent performance of a vital agency mission; is for a repeated or uncorrected level II NCRs/CARs; or is for a non-responsive contractor to a level II NCR/CAR. Critical non-conformance shall result in the issuance of a written NCR/CAR, Letter of Concern, or a Show Cause Notice from the KO to the contractor requiring a response by the contractor by a specified timeframe identifying the reasons for the unsatisfactory performance, corrective action(s) taken, and date resolution has/will occur, and procedures to preclude recurrence of unsatisfactory performance. The KO may also reduce the payment to the contractor to reflect the value of the services not performed or if re-performance is not possible or may have the identified non-conforming service performed by some other means and charge the contractor for any related cost incurred.

1.6. Recognized Holidays: The contractor is not required to provide service on U.S. holidays and Republic of Korea (ROK) holidays.

1.6.1. Recognized U.S. Holidays: The recognized US Legal Holidays are listed below:

1.6.2. Recognized ROK Holidays: The recognized ROK Legal Holidays are listed below as well as the Holidays specified in the “Act of Legal Holiday (공휴일에 관한 법률)”.

1.7. Hours of Operation (Business/Duty Hours): The contractor shall conduct dryer duct cleaning services between the hours of 0700 to 1600, Monday through Friday which is normal business/duty hours for the installation. When it comes to hours of operation for HVAC duct cleaning services, it will be determined during the Joint Site Survey in accordance with this PWS Para 5.2. The contractor will be working on HVAC duct system cleaning normally during nighttime outside of the normal business/duty hours of the installation, so the contractor’s bidding price shall factor these constraints into the offering price. The contractor might not be provided with escorts on the holidays listed in the PWS Para. 1.6. nor when the Osan AB conducts military exercise. Therefore, the contractor shall check with the COR for the availability of escorts.

1.8. Type of Contract: The Government will award a Firm-Fixed-Price and Requirements Contract.

1.9. Security Requirements: The contractor’s personnel and any personnel belong to a company in partnership with the contractor entering Osan AB shall abide by all security regulations imposed by the local installation commander and shall be subject to security checks. The contractor’s personnel and property shall be subject to search and seizure upon entering the confines of the installations while on and upon leaving the confines of Osan AB. The contractor shall be responsible for safeguarding all government facilities, equipment, and information property provided for contractor’s use. The contractor shall inform immediately in the form of written document of any damages they caused on the Government property. At the close of each workday/period, government facilities, equipment, and materials shall be secured properly. The contractor shall not photograph the vehicles, equipment, materials, and facilities without an explicit written approval by the COR.

1.10. Special Qualifications

1.10.1. Prime Contractor’s Prior Experience: The prime contractor shall have at least two (2) years of experience of HVAC duct, AHUs, ventilation, and dryer duct cleaning service within the last 5 years with current certification. The contractor shall provide this information of prior experience as a part of technical evaluation factor when submitting proposal. The experience of a subcontractor cannot be substituted for the prime contractor’s experience.

1.10.2. ROK Business Permission: The prime contractor shall submit current and valid certification as below:

(i) One of the following business registrations/permissions:

· “Building Sanitation Control Business Permission (건물위생관리업 영업신고증)”

· “Sanitation Control Business Permission (위생관리용역업 영업신고증)”

· “Business Registration for Facilities Management Services – Building General Cleaning Business (건축물 일반 청소업 – 사업시설관리 서비스업 사업자등록증)”

· “Business Registration for Facilities Management Services – Combined Facilities Support Activities (사업시설 유지관리 서비스업 – 사업시설관리 서비스업 사업자등록증)”

(ii) Annual Hygiene Management Supervisor Training Certificate (공중위생관리 책임자 위생교육 수료증) issued by Korean Facility Hygiene Management Association (한국건물위생관리협회) in CY23 or CY24 to provide cleaning service for HVAC duct, AHUs, Ventilations and Dryer Duct. These licensing and certification shall be maintained up to date throughout the life of contract, and a copy of it shall be submitted to the KO as a part of technical proposal. This certificate shall be renewed every year and a copy of certification shall be provided to the COR (CDRL #2) before thirty (30) calendar days of the start of any work in that regarding year.

1.10.3. Contract Manager (CM): The contractor shall provide a CM who shall be responsible for overseeing the quality of the work. The CM shall have full authority to act for the contractor on all contract matters relating to this contract. The contract manager shall act as a supervisor of the contractor’s employees during the term of the contract. The contract manager shall be able to read, write and speak English for effective management of this contract and communication with the COR. The contract manager shall have at least two (2) years of experience as contract manager within the last 5 years or equivalent in the field of cleaning service for HVAC duct, AHUs, ventilations, and dryer duct.

1.11. Escort Privileges: The CM shall be authorized to have escort privileges for three (3) personnel and one (1) vehicle. This privilege is only for employees working on this contract. It is the escort sponsor’s responsibility to ensure full control of those who are escorted at all times.

1.12. Contractor Employees: The contractor shall provide personnel who are capable of performing the requirements described in this PWS. The contractor personnel shall present a neat appearance and be easily recognized. This may be accomplished by wearing distinctive clothing bearing the name of the company or by wearing appropriate badges, which contain the company name and employee’s name. The contractor and the CM shall have full control on their employees to abide by all the regulations of the installation.

1.13. AT and OPSEC

1.13.1. Anti-terrorism (AT) statement: The contractor’s personnel or any representative of the contractor entering installation/base shall abide by all security regulations imposed by installation commander or base commander at all times and shall be subject to security checks. The contractor’s personnel and property shall be subjected to search and seizure upon entering the confines of the installation/base, while on, and upon leaving confines of the installation/base.

1.13.2. OPSEC statement: The contractor and all associated sub-contractors will practice Operations Security. The contractor shall not talk about work outside of the work area nor discuss the work being performed on social media. The contractor shall not take pictures/videos (to include operation of dashcams or other recording devices in contractor operated vehicles) inside sensitive locations without prior coordination with the organization’s OPSEC representative and contracting officer representative. It will be the responsibility of the contractor to safeguard all documents provided. Documents will be stored away from view when not being used. Documents, media, drawings, and other associated material that are no longer needed must be destroyed via approved methods.

Part 2 Definitions and Acronyms

2. Definitions and Acronyms

2.1. Definitions

2.1.1. Contractor: A supplier or vendor awarded a contract to provide specific supplies or service to the Government. The term used in this contract refers to the prime.

2.1.2. Contracting Officer (KO): A person with authority to enter into, administer, and or terminate contracts, and make related determinations and findings on behalf of the government. Note: The only individual who can legally bind the government.

2.1.3. Contracting Officer’s Representative (COR): An employee of the U.S. Government appointed by the contracting officer to administer the contract. Such appointment shall be in writing and shall state the scope of authority and limitations. This individual has authority to provide technical direction to the contractor as long as that direction is within the scope of the contract, does not constitute a change, and has no funding implications. This individual does not have authority to change the terms and conditions of the contract.

2.1.4. Customer: Those personnel within a facility that receives services reflected in this PWS.

2.1.5. Defective Service: A service output that does not meet the standard of performance associated with the Performance Work Statement.

2.1.6. Deliverable: Anything that can be physically delivered but may include non-manufactured things such as meeting minutes or reports.

2.1.7. Expendable Materials: Items that are not supplied by the Government as part of the Government Furnished Property and Services. Such items may include soap, disinfectors, screws, nuts, bolts, washers, electrical tape, lubrication, etc.

2.1.8. Key Personnel: The contractor personnel that are evaluated in a source selection process and that may be required to be used in the performance of a contract by the key personnel listed in the PWS. When key personnel are used as an evaluation factor in best value procurement, an offer can be rejected if it does not have a firm commitment from the persons that are listed in the proposal.

2.1.9. Performance Requirement: The point that divides acceptable and unacceptable performance according to the performance requirement summary and the inspection of services clause. It is the number of defectives or maximum percent defective in the lot that is deemed acceptable.

2.1.10. Performance Requirement Summary: A listing of the service outputs under the contract that are to be evaluated by the COR on a regular basis, the surveillance methods to be used for these outputs, and the performance requirement of the listed outputs.

2.1.11. Physical Security: Actions that prevent the loss or damage of Government property.

2.1.12. Quality Assurance: The government procedures to verify that services being performed by the Contractor are performed according to acceptable standards.

2.1.13. Quality Assurance Surveillance Plan (QASP): An organized written document specifying the surveillance methodology to be used for surveillance of contractor performance.

2.1.14. Quality Control: All necessary measures taken by the contractor to assure that the quality of an end product or service shall meet contract requirements.

2.1.15. Sub-contractor: One that enters into a contract with a prime contractor. The Government does not have private of contract with the sub-contractor.

2.1.16. Work Day: The number of hours per day the contractor provides services in accordance with the contract.

2.1.17. Work Week: Monday through Friday, unless specified otherwise.

2.1.18. Agitation: A process that involves using an agitation device to dislodge or move non-adhered substances within an HVAC system.

2.1.19. Agitation Device: A tool or tools used to dislodge or move non-adhered substances within the HVAC system. (Examples may include, brushes, whips, compressed air, contact vacuum attachments, etc.)

2.1.20. Sufficient Negative Pressure: Implies enough negative pressure to satisfactorily prevent debris from entering the occupied space or leaving the contained area.

2.1.21. Contact Vacuum: A collection device, usually portable, that uses a nylon brush nozzle attached to the end of its inlet air hose. The brush head is applied directly to a surface for mechanical agitation and cleaning.

2.1.22. Contaminant: Any substance not intended to be present within the HVAC system.

2.1.23. Debris: Non-adhered substances not intended to be present within the HVAC system.

2.1.24. HEPA: High Efficiency Particulate Air. To be called a true HEPA filter, or certified HEPA filter, the filter will have a documented filtration efficiency of 99.97% at 0.3 micron-sized particles (US Department of Energy)

2.2. Acronyms

Part 3 Government Furnished Property, Items, and Services

3. Government Furnished Property, Items, and Services

3.1. As-built Drawing: The contractor shall be provided with a Mechanical Plan of each facility to be cleaned. This plan will contain the best information possible on the existing condition of the ductwork layout, diffusers, and air handlers in the facility.

3.2. Security, Fire Protection, Medical Service: The Government will provide security, fire protection, and medical service in emergencies. The call number for emergency call is 0505-784-9111. Base ambulance service for transporting injured employees to a local hospital is available on a cost reimbursement basis.

3.3. Utilities: The Government will provide reasonable quantities of water and electricity at no charge to the contractor only required for work performed under this contract. Coordination shall be made with the installation engineer for location of water and electrical supply points. Temporary connections shall be made and removed at the contractor’s expense regardless of distance or accessibility of existing service. All connections shall be made by experienced craftsman and shall be coordinated with the COR. Government utilities damaged due to the contractor’s performance shall be cleaned, repaired, replaced, or restored to a condition not less than that existing immediately prior to damage by the contractor and without cost to the Government. Utilities required for work performed at off-base locations shall be obtained at the contractor’s expense.

3.3.1. Conservation of Utilities: The COR will instruct the contractor on the importance to conserve utilities and that contractor is liable for the cost of those utilities expended above and beyond what is considered normal and necessary for the safe and professional execution of performance described in the PWS.

3.4. Damages to Government Property: Any Government Properties soiled or damaged due to the contractor’s performance shall be cleaned, repaired, replaced, or restored to a condition not less than that existing immediately prior to damage at the contractor’s expense and without cost to the Government.

Part 4 Contractor Furnished Items and Services

4. Contractor Furnished Items and Services

4.1. General: The Contractor shall provide all personnel, equipment, supplies, facilities, transportation, tools, materials, supervision, and other items required to perform the requirements of this contract.

4.2. Equipment: The contractor shall furnish equipment needed to perform this contract according to all its terms. The COR may inspect the contractor’s equipment at any time and ask the contractor to remove any item that do not meet industry standards. Equipment failing to meet required standards shall be replaced by the contractor at contractor’s expense.

4.3. Life Support and Sustainment: The Contractor shall be responsible for providing all necessary life support for the contractor’s personnel executing the requirements of this PWS.

4.4. Safety:

4.4.1. General: The contractor must perform all operations in a prudent, conscientious, safe and professional manner to comply with the provisions of the Occupational Safety and Health Standards Act (inclusive of equivalent Korean Standards, KOSHA) and applicable Korean Laws and Regulations. The contractor shall ensure that their employees adhere to the proper lockout/tagout procedures as indicated in para 5.7.13.7. All personnel protective equipment shall be provided by the contractor and must be appropriate to ensure safe handling of equipment and cleaning materials.

4.4.2. Safety Plan: The safety plan shall explain procedures to ensure all employees familiarize themselves with the safety requirements of the contract before commencement of work. The contractor shall ensure that safety precautions are taken during the performance of this contract to protect the lives of the contractor’s personnel, the property of the U.S. Government and the Republic of Korea, as well as the private individuals and firms who may be exposed to or be endangered by the contractor’s actions to maintain minimal accidents/incident, zero loss of life and minimal damage to property. The contractor shall provide a written safety plan with policies, procedures, and safety checklist thirty (30) calendar days before the start of performance of each Task Order (CDRL #3). The contractor agrees to comply with its written program for the life of the contract. Any changes or modification to its safety program shall be submitted to the COR for coordination and review.

4.4.3. Accident Investigations, Reports, and Logs: The Safety Management Plan shall include the contractor’s accident investigation and report format, and methods to maintain its logs. The contractor shall report all accidents as soon as possible but not later than four (4) hours of occurrence to the KO and the COR. The contractor shall thoroughly investigate the accident and submit the findings of the investigation along with appropriate corrective actions to the KO and the COR in the accident investigation reporting format as soon as possible but no later than five (5) working days following the accident. Implement corrective actions as soon as reasonably possible. The accident investigation reporting format shall include at a minimum of below items.

1) Contract number and contract name/description.

2) Name of contractor

3) Date/time of accident

4) Date report was completed

5) Detail description of events that lead to the accident

6) Root cause of accident

7) Contributing factors

8) Corrective action(s) to prevent recurrence

4.4.4. Immediate Report Requirements: The following accidents require immediate accident notification and written accident report to the COR and the KO.

1) A fatality

2) A permanent disability

3) An injury requires hospitalization for more than one (1) day

4) The Government property damage

4.4.5. Fire Protection and Prevention: The contractor shall comply with the provisions of the Base Fire Protection/Prevention Program. The contractor shall provide suitable fire extinguishers as necessary in the performance of work under this contract. Fire extinguishers must be inspected, maintained, and stored in a readily available location.

Part 5 Specific Tasks

5. Specific Tasks

5.1. Work Schedule: After the joint site survey for HVAC Duct Cleaning as in the PWS Para. 5.2., the contractor shall establish a work schedule (CDRL #4) and submit to the COR thirty (30) calendar days before the start of performance of each Task Order. A work schedule will be provided to the COR that outlines the work to be performed regarding the HVAC Duct Cleanings. The schedule will state the facility number, number of service days, time, possible disruptions and countermeasures. Photos of the duct will be taken of the before and after cleaning and be presented to the COR via hard and soft copy. The schedule shall be coordinated with the COR so that it does not disrupt Air Force mission requirements. Regarding the drying duct cleaning schedule, the schedule should follow all the same standards as the HVAC Duct Cleanings schedule except the drying duct work will be done on a quarterly basis.

5.2. Joint Site Survey: The contractor shall conduct a site survey jointly with 51 CES/CEOIH HVAC Shop and 51 CES/CEOES COR for HVAC Duct Cleaning at no additional cost to the Government, for inventory purposes. The COR will coordinate with the CM to conduct the joint site survey at least forty (40) calendar days prior from the Government proposed survey date. The information provided to the contractor in the notice will include:

The joint site survey will determine:

5.3. Post Cleaning Report: Upon completion of each task/service for both the HVAC Duct Cleaning and Dryer Duct Cleaning, the contractor shall provide the COR with 1 electronic and 1 hard copy of the post cleaning report (CDRL #5) within seven (7) days after the completion of service on each facility. The report shall contain pictures and videos comparing the conditions of the system before and after the work. This visual material shall be prepared to easily identify the facility of which the HVAC/dryer system is cleaned. Any picture used in the report shall be taken using a camera application which automatically stamps time, date, and location. Any information/fact that might affect the function of the HVAC/dyer system should be described in that report in detail.

5.4. Jobsite Clean-up: All contractor supplies, equipment, and machinery shall be kept out of traffic lanes or other areas where it may cause a hazardous condition. All trash, debris, liquid generated from the contractor’s performance shall be removed and disposed of off the installation by the end of each and at the contractor’s own expense. The contractor shall keep clean the area where cleaning service is provided to avoid disruption to government personnels’ work during and at the end of each day’s cleaning.

5.5. Materials/Parts Submittals: The contractor shall submit all required materials, parts, equipment, and chemicals using AF Form 3000 (Material Approval Submittal) along with the Safety Data Sheet (SDS) in both Korean and English translations to the COR for approval no later than 14 days before the work starts.

5.6. Dryer Duct System Cleaning

5.6.1. General Instructions: The quantity for dryer duct provided in Technical Exhibit 3 is an approximate quantity of regarding floor area and the contractor shall provide cleaning service for all the dryer ducts in the buildings in Technical Exhibit 3 at a frequency described in Technical Exhibit 3 with no additional cost. Therefore, the contractor is highly recommended to attend site visit to fully understand the Government’s requirements.

5.6.2. Dryer Duct System Cleaning Service: Before the start of cleaning work, the contractor shall cover other equipment/sensors/furniture properly such that the contractor’s work does not damage or contaminate those aforementioned items. The contractor shall disassemble and remove all necessary covers, access points, and connections to access the permanent installed duct/vent tubing, and then clean inside/outside of all duct system including fans/lint trap/filter/exhaust hood/exhaust outlet/cover/any other components all the way through outdoor termination point. Once cleaning is completed, re-install the dryer duct system to its original condition. The contractor shall provide cleaning service for all the dryer ducts in the buildings in Technical Exhibit 3 at a frequency described in Technical Exhibit 3. The contractor shall use proper equipment that can reach deep inside the ductwork where contaminants exist not damaging the ductwork system nor dryers.

5.6.3. Cleaning Methods: The contractor shall use mechanical agitation methods with air blast such as whip nozzle as well as brushing method to remove any sort of contaminants and vacuum collection device to capture dislodged substances. The device that the contractor uses shall be capable of physically reaching all the way to the opposite end/exit of the dryer duct.

5.6.4. Vacuum Collection Equipment: The contractor shall operate vacuum collection equipment continuously during cleaning. When the vacuum collection equipment is used to convey air with debris, it shall maintain a sufficient velocity and negative pressure differential in the portion of the HVAC system component being cleaned in accordance with the NADCA Standard. The vacuum collection equipment shall use HEPA filtration with 99.97% collection efficiency at 0.3 microns particle size all the time during the cleaning service to minimize disruption to the occupants.

5.7. HVAC Duct System Cleaning

5.7.1. General Instructions: The contractor shall perform cleaning service on HVAC system (ductwork, AHUs, dampers, diffusers, exhaust system, and all the other components contributing to the functional integrity of the HVAC system) for any building in Osan AB which will be determined at each time of request. Regardless of exact duct size or its total length, the required area of cleaning for all HVAC duct in each facility will be calculated by floor area. The floor area refers to gross floor area on each story of a building except any significant (exceeding 5% of the regarding story’s floor area where the deduction is applied) area which does not count on nor accommodating the HVAC system such as elevator shaft, staircase, warehouse, vestibule, janitor room, attic, basement, open space (balcony, patio, etc.), and duplicating area (e.g., mezzanine). Even though a separated unit/module/room is dependent on HVAC system, if its HVAC duct ends as soon as it enters the unit/module/room, that unit/module/room shall not be counted into the floor area.

5.7.2. Standards: A standard by which the contractor’s performance will be assessed for any acceptance of performance is NADCA (National Air Duct Cleaners Association) standard (most recent/latest edition) which provides standards and guidance for industry professionals, HVAC assessment, cleaning, and restoration service providers, building owners, and others who manage HVAC systems and projects. The COR will then be the final approver of the completion of the work. If the work is not satisfactory the COR will notify the contractor of the dissatisfaction, and the cleaning will be done again.

5.7.3. Vacuum Collection Equipment: The contractor shall operate vacuum collection equipment continuously during cleaning. When the vacuum collection equipment is used to convey air with debris, it shall maintain a sufficient velocity and negative pressure differential in the portion of the HVAC system component being cleaned in accordance with the NADCA Standard. The vacuum collection equipment shall use HEPA filtration with 99.97% collection efficiency at 0.3 microns particle size all the time during the cleaning service to minimize disruption to the occupants.

5.7.4. Negative Duct Pressurization: Prior to and throughout the duration of the cleaning process, the HVAC system components and associated air ducts shall be kept at an appropriate negative pressure differential relative to the indoor non-work area. This negative pressure differential shall be maintained between the portion of the HVAC duct system components being cleaned and surrounding indoor occupant spaces.

5.7.4.1. Verifying Negative Pressure Differential: Under all circumstances, the contractor shall verify pressurization differential during the cleaning.

5.7.4.2. Equipment Exhausting Indoors: Vacuum collection equipment exhausting indoors shall be HEPA filtered and be capable of retaining dislodged debris.

5.7.4.3. Equipment Exhausting Outdoors: All equipment used to create negative duct pressurization that does not have HEPA filtration shall be exhausted outdoors keeping discharged air clear of outdoor air intakes, operable windows, and other locations allowing outdoor air entry.

5.7.5. Visual Materials: The contractor shall record the entire condition and area inside the ductwork by video camera mounted on the cleaning robot so that the performance can be visually inspected before and after cleaning. This digital recording shall be submitted to the COR prior, per paragraph 5.3 to submittal of contractor’s invoice for payment.

5.7.6. Protection and Restoration methods: All merchandise, furniture, computers, etc. shall be covered by a plastic covering to protect the items during cleaning operations. If the area is deemed too large by the COR to cover all the items in plastic, then alternatively a debris catch can be installed at the vent exit by the contractor to protect the items from cleaning operations. After the duct/vent systems are properly cleaned, the contractor shall clean all surrounding areas where foreign matter or moisture may have fallen, and all duct/vent systems shall be resealed to the original location and condition. All materials, equipment, appliances, and furnishings shall be reinstalled to their original location and condition.

5.7.7. Service Openings: Any service opening created for the cleaning process shall be repaired such that it does not degrade the structural, thermal, or functional integrity of the ductwork. All openings, after the completion of cleaning shall be sealed and caulked to prevent air leakage. For insulated duct, care shall be exercised to neatly cut off the insulation for openings. After the completion of work, the removed pieces shall be reinstalled neatly. The reinstalled patch shall be marked with fluorescent color (paint or tape) in order to be easily identified for the future cleaning work. The contractor shall inform the COR of closing/sealing/caulking/welding service openings before (2) working days to finalize the task. Any task that did not confirmed by this procedure will not be considered completed. Any additional cost incurred during re-confirming procedure shall fall under the contractor’s expense. The contractor shall not cut into flexible ducts for service openings. The flexible ducts shall be disconnected at the ends as needed for proper cleaning and inspection. When the flexible ducts should be cut, the contractor shall replace with new ones with the same quality or above. The contractor’s post cleaning report shall contain information of the numbers and locations of those service opening for possible future use.

5.7.8. Service Panels: Service panels used for closing service openings in the HVAC system components shall be of an equivalent gauge or heavier so as to not compromise the structural integrity of the duct. Service panels shall be mechanically fastened (screwed or riveted) at minimum every 4 in. on center. The panel shall overlap the ductwork surfaces by a minimum of 1 in. on all sides. Service panels shall be sealed with gaskets, duct sealants, mastic, or tape. All tapes and mastics used in the closure of service openings shall meet the requirements of UL 181A/B.

5.7.9. Non-Hazardous Material: All products used shall comply with any local and federal regulations and/or other laws regulating the use of such agents. The contractor shall be responsible in using chemicals safely and avoid substances that may become hazardous to customers. The chemical being used must be a non-hazardous type of cleaner such as neutral or bioenvironmental friendly detergent.

5.7.10. Remediation of Mold Contamination: Remediating mold shall be performed in accordance with the ANSI/IICRC S520 Standard for Professional Mold Remediation and the cleaning/restoration of the HVAC system component provisions as outlined within this standard.

5.7.11. Cleaning Fibrous Glass Duct System Components: The mechanical cleaning methods selected for duct liner or fibrous glass duct board shall not create abrasions, breaks, or tears to fibrous glass liner or duct board surfaces.

5.7.12. HVAC Duct System Cleaning Service: Beneficiary of this cleaning service is all the buildings in Osan AB, however the specific buildings that the contractor will perform are decided after the joint site survey according to the PWS Para. 5.2. The scope of this cleaning service is for the entire HVAC ductwork which delivers air from AHU to different locations of the building (up to diffusers) and from return air grille to exhaust system. All foreign matters (lint, debris, dust, soot, etc.) shall be removed by use of a robot cleaner and any cleaning techniques specifically required for this service. The contractor shall clean the system so that it is free of any chemical vapors, odors, and mold. All furniture, desks, chairs, etc. shall be covered by vinyl covering for protection during the cleaning operations.

5.7.12.1. Supply & Return Air Duct Cleaning: The contractor shall clean the entire HVAC ductwork using mechanical agitation methods with air blast such as whip nozzle as well as brushing method to remove any sort of contaminants and vacuum collection device to capture dislodged substances. The device that the contractor uses shall be capable of physically reaching all the way to the opposite end/exit of the duct. The contractor shall be equipped with proper inspection equipment with mounted camera to record for submit and demonstrate to the COR whenever the COR requests. The contractor is responsible for cleaning all debris and removing trash/foreign materials found inside the supply duct. This work includes caulking and puttying to prevent air leakage.

5.7.12.2. Dampers Variable-Air-Volume (VAV) Control Device Cleaning: All dampers and VAVs will be cleaned inside and outside according to the manufacturer’s recommendations. Dampers and any air-directional mechanical devices inside the Air Conveyance System (ACS) must have their position marked prior to cleaning and must be restored to their marked position upon completion.

5.7.12.3. Air Handling Unit (AHU) Cleaning: The contractor shall properly wet clean and dry clean the inside of the AHU including all the components, but not limited to, supply & return air intakes, chamber, fan, plenum, scroll cage or blower wheels, shafts, baffles, dampers, drain pans, coils, air filters, humidifiers, heat exchangers, drains, and pans. The contractor shall inform the COR of closure of casing or housing of AHUs before (2) working days to finalize the cleaning task. Any task that did not confirmed by this procedure will not be considered completed. Any additional cost incurred during re-confirming procedure shall fall under the contractor’s expense. Additionally, all work will follow the safety standards as per para 4.4.1, to include but not limited to lockout/tagout procedures.

5.7.13. Cleaning Coils: When coil cleaning is performed, the contractor shall make sure that both upstream and downstream sides of each coil section be accessed for cleaning. Before cleaning begins on the coils, lockout/tagout procedures will be implemented as per para 4.4.1.

5.7.13.1. Preliminary Coil Inspection: A visual inspection of the coil and drain pan shall be conducted prior to cleaning a coil to determine whether Type 1 (Dry Cleaning) or Type 2 (Wet Cleaning) is required. If it is determined the coil cannot be properly cleaned through Type 1 (Dry Cleaning), Type 2 (Wet Cleaning) shall be performed. If the preliminary visual inspection reveals suspect microbial contamination on any portion of the coil or drain pan, Type 2 (Wet Cleaning) shall be performed. When the metal fins of the coil are damaged, deteriorating, or showing signs of corrosion to require replacement, the contractor shall report it to the COR on the post cleaning report.

5.7.13.2. Type 1 Coil Cleaning (Dry Cleaning): Type 1 (Dry Cleaning) methods of coil cleaning shall be used for removing loose dust, dirt, or debris collected upon coil surfaces. Negative air machines shall be operated continuously during Type 1 (Dry Cleaning) coil cleaning process. The coil shall be isolated from the duct system during the cleaning process to ensure disrupted particulate does not migrate to, or redeposit on, unintended areas. Physical removal of debris may be accomplished through a variety of methods which may include:

1) HEPA filtered contact vacuuming

2) Brushes for penetrating between coil fins

3) Compressed air

4) Fin straightening tools

5.7.13.3. Type 1 (Dry Cleaning) Post-Cleaning Inspection: This inspection shall be performed after Type 1 (Dry Cleaning) coil cleaning has been completed. If debris remains on the coil or the coil is impacted, Type 2 (Wet Cleaning) shall be performed. Before cleaning begins, lockout/tagout procedures will be implemented as per para 4.4.1.

5.7.13.4. Type 2 Coil Cleaning (Wet Cleaning): Type 2 (Wet Cleaning) methods are appropriate for removing adhered debris on all coil, drain pan, and drain line surfaces. Type 2 (Wet Cleaning) shall be performed after non-adhered substances has been removed using Type 1 (Dry Cleaning) methods. Type 2 (Wet Cleaning) may include the following methods:

1) All methods under Type 1 (Dry Cleaning)

2) Application of coil cleaning products (which shall be used in accordance with the manufacturers product labeling)

3) Water washing at normal water line pressure

4) Pressure washing equipment

5) How water or steam cleaning equipment

The condensate drain pan and drain line shall be cleaned and flushed. The condensate drain pan shall be inspected and tested to verify drainage before and after cleaning. Cleaning methods and products shall not cause damage to, or erosion of, the coil surface or fins and shall conform to coil manufacturer recommendations when available. The contractor shall apply only coil cleaning solutions that are close to pH neutral as possible are used. Before cleaning begins, lockout/tagout procedures will be implemented as per para 4.4.1.

5.7.13.5. Type 2 (Post-Cleaning Inspection): Type 2 (Wet Cleaning) inspections shall be conducted after completion of type 2 (Wet Cleaning) methods. If debris still remains on the coil after Type 2 (Wet Cleaning), the process shall be repeated.

5.7.13.6. Inline Coils: The inline coils shall be cleaned with pressurized water and non-corrosive indoor coil cleaner. If the coil does not have a drain pan mounted under the coil, then the water from the cleaning will be caught using a bucket or an alternate water catching device to prevent water from damaging the ceiling. Type 1 (Dry Cleaning) and/or Type 2 (Wet Cleaning) methods shall be used for cleaning inline coils.

5.7.13.7. Electric Resistance Coils: When cleaning electric resistance coils, the power source to the coils shall be de-energized and locked out/tagged out. When wet process cleaning is used, only non-corrosive detergents shall be used, and the coil shall be rinsed free of chemicals and thoroughly dried prior to being re-energized.

5.7.13.8. Restore/Straighten Coils: The contractor shall restore/straighten all the bent coil fins using a fin comb.

5.7.14. Outside Air Grill & Exhaust Air System Cleaning: The contractor shall clean outside air grills and exhaust air outlets located in areas such as the roof connected to the mixing boxes.