NYC-WTC_000195194

NYC 9/11 Public Portal Document

w w Store, Lemongrass Grill, and The Food Exchange. These systems were cleaned by professional duct cleaning companies using standard cleaning procedures. w E. (Wet Wiping.) Wet wiping was accomplished using water only on horizontal and vertical surfaces. This cleaning procedure was applied in the Chiropractor’s Office (bathroom tile floor and desktop), the Mattress Store (vinyl tile floor and window ledge), and the Barber Shop (vertical and horizontal surfaces). w Modified Scope A - Lower Manhattan Cleaning Procedure Added as an amendment to the original work plan, this cleaning method mirrored the procedure that EPA and NYC are implementing as part of the Indoor Air Residential Assistance-WTC Dust Cleanup Program, with the exception of the cleaning of personal belongings. This procedure is presented in Attachment F, Scope A - Lower Manhattan Cleaning Procedure.

w 2.5 Mobilization

Site activities began on June 17, 2002. Activities included mobilizing equipment and supplies, establishing a temporary office, identifying emergency support services and contacting vendors to arrange for specialized services and delivery of bulk items. Consolidated Edison was contacted and installed a shunt from the main trunk line to the building to provide electricity. Mobilization was completed by June 21, 2002. On June 24, 2002, WRS laborers arrived at the study building to begin work. Work continued through the third week of October 2002. w

Prior to commencement of the study, bulk samples were collected from three units in the building. * Samples were collected from units that contained excessive amounts of dust, in an attempt to characterize the asbestos concentration in dust from worst case locations in the building. Samples * were collected from the Chiropractor's Office, the Mattress Store and residential Unit 5C. Analysis of the samples indicated that less than one percent asbestos was present. Therefore, NYC asbestos licensing and certification regulations did not apply to the project. The federal OSHA asbestos standard (29 CFR 1926.1101) did apply to the project. At EPA direction, WRS assigned a team of asbestos-trained personnel to the project. Two licensed supervisors and two ■4 licensed workers were part of the operations team. All field operations personnel had completed all applicable training.

2.6 Cleaning of Residential Units

The cleaning of each of the thirteen residential units was accomplished using the vacuum equipment type prescribed by the designated test, as presented in Attachment H, Synopsis of Cleaning Methods by Building Area and Fact Sheets. Management of waste was accomplished as the cleaning activities occurred. The sequence of procedures followed in each residential unit was the same. >«

Security. The first cleaning activity in each unit related to the securing of potential access points from air infiltration, such as wall and window mounted air conditioning units. It was necessary to clean the access points as they were secured, to ensure that use of the access points after cleaning activities would not result in re-contamination. In order to limit unauthorized access to the building and to protect equipment and supplies during daytime work hours, previously damaged windows were secured and the entrance door to the building was continuously monitored. At the 17

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NYC-WTC_000195213