J02 SOW - Fort Hall Dental HVAC Reconfiguration.pdf

SECTION C

STATEMENT OF WORK

DENTAL AIRFLOW RECONFIGURATION PROJECT

I. Overview

A. Site Location

Dental airflow reconfiguration services to be provided on the Heating, Ventilation, and

Air Conditioning (HVAC) systems at the Not-Tsoo Gah-Nee Indian Health Center, located in Fort Hall, Idaho.

33 North Mission Road

Fort Hall, ID 83203

A sitemap is included in the attachments.

B. Objective

Due to the COVID-19 pandemic caused by the SARS-COV-2 virus, The Centers for

Disease Control and Prevention (CDC) has provided guidelines for the operation of open-operatories in dental clinics. These recommendations include directional airflow from the buildings heating, ventilation, and air conditioning system (HVAC) to originate in the hallway or corridor outside the operatory and exhaust or return near the back of the room.

The airflow orientation in the Fort Hall Health Clinic’s open operatories do not comply with the CDC’s recommended guidelines. This project will result in airflow directionality that meets these guidelines and satisfies required volumetric flow rates and air changes per hour.

C. Work Summary

The HVAC airflow reconfiguration shall include:

1. Evaluate drawings, layouts, and building schematics to understand the existing system, including ductwork, HVAC components and airflow rates.

2. Inspect building systems & ductwork routing documents, and report potential conflicts and submit an HVAC Airflow Reconfiguration Plan.

3. Demolish, construct, procure and install new ductwork, supply and returns.

4. Perform a Test, Adjust, and Balance for the affected areas to achieve designated airflow rates.

5. Create As-Built documents demonstrating new/final HVAC layout and airflow rates.

II. Technical Requirements

A. Codes, References, and Standards

1. Centers for Disease Control and Prevention: Guidance for Dental Settings https://www.cdc.gov/coronavirus/2019-ncov/hcp/dental-settings.html

2. ASHRAE 62.2 Ventilation and Acceptable Indoor Air Quality

3. ASHRAE 170 Ventilation of Healthcare Facilities

4. ANSI/ASHRAE Standard 111 Measurement, Testing, Adjusting, and Balancing of Building Ventilation, Air-Conditioning, and Refrigeration Systems.

5. SMACNA HVAC Duct Construction Standards - Metal and Flexible

6. International Mechanical Code

7. International Building Code

B. Submittals

The Contractor shall provide submittals on the items listed below. Contracting Officer

Representative (COR) approval is required before proceeding with the portion of work the submittal applies to.

1. Schedule

a. Project to be completed 20-days from the Notice to Proceed (NTP).

b. Includes a 5-day government review period for each submittal.

2. HVAC Airflow Reconfiguration Plan

3. Ductwork, supply, and return hardware

4. Final Balancing Report

5. As-Built mechanical documents

C. Quality Assurance

1. The HVAC contractor shall be licensed in the field and demonstrate a minimum 5-years of experience with commercial HVAC and ductwork installation.

2. TAB Contractor shall be certified with either Associated Air Balance

Council (AABC) or the National Environmental Balancing Bureau (NEBB).

3. Instrumentation Calibration: The TAB balancing agent shall use instruments that have been calibrated by a certified calibration facility within the period of time required by ASHRAE Standard 111 and the instrument manufacturer.

4. All ductwork must be sized to reduce friction and not exceed the maximum of

0.1 in. water per 100 ft. of friction loss.

5. Project will result in all open operatories achieving a minimum of 12 air changes per hour (ACH) with 2 ACH of fresh outside air (OA). These rooms must maintain a negative pressure relationship to the corridor.

6. Ductwork Configuration attachments are diagrammatic in nature and must be field verified. These documents are to be followed as a project guideline and may be modified for use in the HVAC Airflow Reconfiguration Plan with written approval from the COR.

D. Work Execution Requirements

1. Perform site evaluation and inspect ductwork routing, sizes, locations, and possible obstructions. Evaluate Ductwork Configuration attachment, which includes configuration plans and airflow rates.

2. Create submittal demonstrating an HVAC Airflow Reconfiguration Plan. This plan will show ductwork materials, takeoffs, sizes, friction factors, airflow rates, and mounting hardware.

3. Complete project as documented in the HVAC Airflow Reconfiguration Plan and approved by the COR.

4. Perform Test, Adjustment, and Balance procedures to achieve airflow requirements in the Ductwork Configuration attachment. Record all supply, return, exhaust, and fresh airflow rates for the open operatories modified in this project.

5. To maintain positive or negative pressure relationship in each pressure zone, balancing tolerances must maintain the minimum or greater design airflow differential.

6. In order to prevent air leakage, the Contractor shall plug all holes that have been made in the ducts for taking test readings. Disruption of duct, pipe, and/or equipment insulation shall also be appropriately repaired by the Contractor.

7. If minimum airflow rates are not achievable, notify the COR immediately.

8. Create As-Built mechanical documents for the areas affected. This document will demonstrate new ductwork routing, sizes, and airflow rates.

II. Attachments

Attachment A – Building sitemap (below)

Attachment B – Ductwork Configuration (separate attachment)

Attachment A – Buildings for TAB activities

Fort Hall Service Unit - Fort Hall, ID