Cleaning Procedures and Equipment
Controlling Contaminants B-9
■ Bleach enriched
■ Petro-chemical based
■ Floor strippers or re-conditioners
It is also important that the recommended concentrations are used, as even an
appropriate agent in an inappropriate concentration can be potentially damaging. The
solution should be maintained in good condition throughout the project, and excessive
applications should be avoided.
Quarterly Tasks
The quarterly statement of work involves a much more detailed and comprehensive
decontamination schedule and should only be conducted by experienced computer
room contamination-control professionals. These actions should be performed three to
four times per year, based on the levels of activity and contamination present. All
room surfaces should be thoroughly decontaminated including cupboards, ledges,
racks, shelves and support equipment. High ledges and light fixtures and generally
accessible areas should be treated or vacuumed as appropriate. Vertical surfaces
including windows, glass partitions, doors, and so forth should be thoroughly treated.
Special dust cloths that are impregnated with a particle absorbent material are to be
used in the surface decontamination process. Do not use generic dust rags or fabric
cloths to perform these activities. Do not use any chemicals, waxes or solvents during
these activities.
Settled contamination should be removed from all exterior hardware surfaces
including horizontal and vertical surfaces. The unit's air inlet and outlet grilles should
be treated as well. Do not wipe the unit's control surfaces as these areas can be
decontaminated by the use of lightly compressed air. Special care should also be taken
when cleaning keyboards and life-safety controls. Use specially treated dust wipes to
treat all hardware surfaces. Monitors should be treated with optical cleansers and
static-free cloths. Do not use Electro-Static Discharge (ESD) dissipative chemicals on
the computer hardware, since these agents are caustic and harmful to most sensitive
hardware. The computer hardware is sufficiently designed to permit electrostatic
dissipation thus no further treatments are required. After all of the hardware and room
surfaces have been thoroughly decontaminated, the access floor should be HEPA
vacuumed and damp mopped as detailed in the Weekly Actions.
Biennial Tasks
The subfloor void should be decontaminated every 18 months to 24 months based on
the conditions of the plenum surfaces and the degree of contaminant accumulation.
Over the course of the year, the subfloor void undergoes a considerable amount of
activity that creates new contamination accumulations. Although the weekly above
floor cleaning activities will greatly reduce the subfloor dust accumulations, a certain
amount of surface dirt will migrate into the subfloor void. It is important to maintain
the subfloor to a high degree of cleanliness since this area acts as the hardware's
supply air plenum. It is best to perform the subfloor decontamination treatment in a
short time frame to reduce cross contamination. The personnel performing this
operation should be fully trained to assess cable connectivity and priority. Each
exposed area of the subfloor void should be individually inspected and assessed for
possible cable handling and movement. All twist-in and plug-in connections should be
checked and fully engaged before cable movement. All subfloor activities must be
conducted with proper consideration for air distribution and floor loading. In an effort
to maintain access floor integrity and proper psychrometric conditions, the number of
floor tiles removed from the floor system should be carefully managed. In most cases,
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