DEP letter reviewing WTC indoor dust cleaning scope of work,

NYC 9/11 Public Portal Document

forward them to DEP for processing. Decisions regarding the reimbursement of costs will be made by DEP.

All cleaning operations will be conducted in accordance with either Scope A or Scope B as described below.

HEPA means a filter system capable of trapping and retaining 99.97% of all mono-dispersed particles of 0.3 micrometers in diameter.

Vacuum means a vacuum cleaner equipped with a HEPA filter, with a minimum static water lift of 95 inches.

Water extraction cleaner means a water extraction carpet cleaner equipped with a motorized agitator brush for carpet cleaning and upholstery nozzle with a minimum static water lift of 95 inches.

The cleaning contractor shall attend the pre-bid meeting and project kick off meeting prior to the commencement of work. The cleaning contractor shall as requested, attend meetings or participate in conference calls with EPA to coordinate field activities.

The cleaning contractor shall apply for any and all necessary permits and applications necessary to complete the work.

Scope of Work A Application: These procedures apply to the cleaning of minimal dust accumulations (light coating). If a visual inspection indicates the presence of significant accumulations of dust and/or debris from the collapse of the WTC, Scope B procedures shall be applied (refer to Scope of Work B). Residents may be present during Scope A cleaning procedures.

6. Cleaning of Common Spaces Common spaces including hallways, stairways and the interior of elevator cars shall be cleaned, if requested by the building owner. The Monitoring Contractor in consultation with EPA, or EPA’s designee will evaluate and determine if other common areas including utility rooms, laundry rooms, compactor rooms require cleaning. Common spaces including elevator shafts, that are determined to contain significant WTC dust and or debris, cleaning will proceed under Scope B. Work will begin from the entrance and continue through all common spaces in an orderly fashion. A detailed description of the minimum cleaning requirements for common space is as follows: a. Vacuuming will begin with the ceiling, continue down the walls and include floors. A vacuum equipped with a motorized agitator bar will be used to vacuum carpets. b. Impermeable walls and floors will be wet wiped, after consultation with and approval by owner. Wet wiping will not be conducted if it is determined that it would cause damage to the surface. c. Carpets will be cleaned with a water extraction cleaner after consultation with and

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