HVAC monitoring addendum to scope of work, August 2002

NYC 9/11 Public Portal Document

ADDENDUM #2 World Trade Center Dust Cleaning Program Monitoring Contract Scope of Work

Determine the components that are accessible. At minimum, representative surfaces of the following system components should be inspected:

— air intake (outdoor or return) — air intake dampers — return air grilles — return air plenum — horizontal surfaces — impingement points (e.g. turning vanes, elbows, transitions) — filter racks and filter media — blower — thermal coils — interior surfaces of the supply air ducts — horizontal surfaces — impingement points (e.g. turning vanes, elbows, transitions) — volume dampers — terminal boxes — supply diffusers

Note that depending on the size and complexity of the HVAC system, access may require the use of ladders, lifts or scaffolds using appropriate methods of fall protection.

6.5.1.2 Methods of Access

The following list summarizes methods of accessing HVAC system components for inspection:

— through existing service openings (i.e., access doors and panels) — by disassembly of housing — by installation of service openings (may range from 1" diameter holes to access doors)

The HVAC/Electrical Professional shall assess the accessibility of each HVAC system component to be inspected. If an HVAC system component is not accessible, the Environmental Professional shall be consulted to determine whether installation of a service opening will likely disturb asbestos-containing materials. After such consultation, if approved by the Environmental Professional, the HVAC/Electrical Professional shall install service openings as needed to inspect the HVAC components listed in 6.5.1.1.

NOTE: Disassembly of housing and installation of service openings may only be performed by the HVA C/Electrical Professional and replacement plates, panels or access doors shall be installed in accordance with NFPA, NADCA and SMACNA standards and NYC building codes.

NYC-WTC 000163421