435500-O25-1595DUCTSVC-02 Exhibit A - Scope of Work.docx.pdf

Exhibit A-Scope of Work

Statement of Work Due to the variance in job size and complexity, Vendors will be required to submit a Statement of

Work (SOW) at a time mutually agreeable to the Vendor and Designee that will detail the specific work activities, deliverables, and timeline that the Vendor will use to perform services in accordance with the specifications of this Contract. The SOW should include but not limited to:

1. Information relating to the location of services

2. Period of performance

3. Deliverable schedule

4. Applicable standards

5. List of subcontractors

6. Miscellaneous data pertinent to performing services in accordance with the requirements of this Contract

Cleaners, Biocides, and Encapsulants Contractor must use cleaners, biocides and encapsulants that must be water-based products specifically designed for application to HVAC duct interiors and capable of being applied with airless spray equipment.

Biocides and encapsulants must be colored differently than the substrate to be coated.

Biocidal agents are to be formulated for long term fungicidal activity with no loss on aging.

Biocidal agents must be registered with the U.S. Environmental Protection Agency for use on the interior of HVAC duct systems.

Cured biocides and encapsulants must provide tough, washable, elastic, and protective finish that is able to withstand light impact or abrasion without breaking down over time or releasing fibers.

Equipment

Contractor must use Particulate Collection Equipment: Fan/filter unit sized to create sufficient quantity of negative pressure for capture and filtration of air and contaminants dislodged during duct cleaning.

Equipment is to include pre-filtration and HEPA final filtration with 99.97% collection efficiency for 0.3 micron size particles.

Contractor must use portable pressure washers that are capable of 500 psig to 1000 psig operation.

Contractor must use power brush systems designed specifically for duct cleaning.

Contractor Cleaning

Work will be performed during regular work hours: 7:00am – 3:00pm Monday through

Friday.

The Contractor shall be responsible for the removal of all contaminants as identified by

Facilities Maintenance Staff such as, dust, debris, and deposits from the air ducts and ventilation systems. This includes, but is not limited to:

• the entire heating, air conditioning and ventilation system

• interior surfaces of air handling units

• coil compartments

Docusign Envelope ID: 288C8D54-F890-44CF-9FC8-408F4930F53A

• condensate drain pans

• humidifiers, dehumidifiers

• supply air ducts

• fans

• fan housing

• fan blades

• air wash systems

• spray eliminators

• blower and fan cases

• return fan units

• exhaust fan units

• louvers

• supply & return grills

The HVAC system may also include other components, such as dedicated exhaust and ventilation components, and make-up air systems.

Work areas shall be kept safe and clean. All dust, dirt, debris, left-over materials, and rubbish accumulated shall be removed. The premises will be left in a clean and neat condition.

If the Facilities Maintenance Staff determines that the work area is unsafe and/or unclear, the

Contractor will be notified, and will then be required to make sure the area is made safe and clean immediately.

Should there be a conflict between the State and Contractor as to whether this performance standard has been met, the State’s opinion on such matters shall prevail.

Contractor must use Particulate Collection Equipment to remove and capture debris.

Contractor will connect Equipment to system downstream of the cleaning operations.

Wherever possible, duct exhaust will discharge to the exterior of the building. Contractor will avoid discharge near air intakes and points of entry. Contractor will arrange source of makeup air to flow from clean area to work area, thus negatively pressurizing work area.

Contractor will take measures to control offensive odors and vapors during the cleaning process.

Contractor must clean systems using mechanical cleaning methods, such as vacuum cleaning, compressed air sweeping, and mechanical brushing. These mechanical cleaning methods are designed to extract contaminants from within the HVAC system and safely remove contaminants from the facility. No cleaning methods are to be used which would damage components of the system or negatively alter the integrity of the system.

Contractor must clean fibrous glass thermal or acoustical insulation with HEPA vacuuming equipment. Contractor will document any locations of damage, deterioration, delamination, mold, fungus growth, or excessive moisture which cannot be restored by cleaning or resurfacing with repair coating.

Contractor will report locations and conditions to Facility Maintenance Manager/Designee for determination of removal and/or replacement.

Where fibrous glass thermal or acoustical insulation is to be removed, scrape and brush metal clean. Remove loose fasteners, weld pins where required for cleaning work and sheet metal covers associated with insulation. Patch and seal fastener openings.

Contractor must clean coils to restore pressure drop to within ten percent (10%) of design rating. Where design rating is unknown, coils must be cleaned free of foreign material and chemical residue.

Contractor cleaning methods used must not bend, erode or damage coil surfaces, fins or tubes.

Contractor must clean coil drain pans and drain.

Contractor must make drain fully operational.

Where wet methods are used, thoroughly rinse coils and drain pans with clean water to remove latent residues.

Contractor must provide temporary drain pans below coils without drain pans to capture water.

Where systems and equipment containing filters are cleaned, the Contractor will obtain replacement filters from the DHS Facilities staff and replace the existing filters.

Biocides and Encapsulants Application

Biocides and encapsulants are to be applied only after cleaning and verification have been completed and surfaces are dry. System fans are to remain off and critical barriers maintained to prevent migration of biocides and encapsulants from the HVAC systems.

Contractor will apply biocides to the following surfaces which are suspected of or have been tested and verified for microbial contamination:

• Plenums and ductwork around and 5’ downstream of cooling coils and humidifiers.

• Cooling coil drain pans.

• Outdoor air intake drain pans.

Contractor will apply encapsulants to the following surfaces where microbial contamination is not suspected:

• Damaged fibrous glass thermal or acoustical insulation.

• Sheet metal where thermal or acoustical insulation has been removed.

Biocides and encapsulants are to be directly sprayed (not fogged), brushed or rolled onto surfaces to achieve a continuous film of thickness recommended by manufacturer. Contractor will increase application rate on porous or rough surfaces.

Contractor will protect coils, fan blades, bearings, damper linkages and seals, fire/smoke dampers, humidifiers, airflow sensors, pressure sensors, temperature sensors, and humidity sensors during application of biocides and encapsulants.

Contractor will clean any overspray from these components immediately. Contractor will allow products to fully cure prior to using HVAC systems. Contractor will operate systems during unoccupied hours, flushing with fresh air to purge system prior to occupied use.

Access Doors

Contractor will install access doors where indicated on the drawings provided by DHS

Facility Staff and in locations where access is required for cleaning or inspection.

Size and numbers of contractor installed duct access doors to be sufficient to perform the intended service. Minimum access door size shall be 8 x 8 inch size for hand access, 18 x 18 inch size for shoulder access, or other size as indicated. Contractor will install access doors on both inlet and outlet sides of reheat coils as well as other duct mounted coils if not existing.

Inspections, Reporting, and Safety

Systems shall be inspected by DHS Facilities staff before work is started and again when work is completed to ensure all systems are working. The Agency will not be responsible for any damage due to Contractor’s negligence. The Contractor will be responsible for repairing any damage to any area not considered as part of the work.

Verification of HVAC system cleanliness will be performed by DHS Facilities staff after cleaning and prior to application of biocides and encapsulates.

The Contractor shall notify DHS Facility staff in advance of verification. Verification will consist of inspection by the Contractor and DHS Facilities staff.

If surfaces are visibly clean, no contaminants are evident through visual inspection, and coils are within ten percent (10%) of design pressure drop, the HVAC system shall be considered clean.

However, the DHS Facility staff have the right to further verify system cleanliness through third party gravimetric or wipe testing analysis per NADCA standards.

Contractor will provide a report describing pre-cleaning inspection and damage, systems cleaned, methods and materials used, problems encountered, final verification and any remaining problems noted. This will include a book of before and after pictures of duct work, coils, vanes, etc. Contractor will also include a thumb drive of records of entire job start to finish.