Air sampling protocol document, 130 Cedar Street, Jan 2005

NYC 9/11 Public Portal Document

130 Cedar Street July 15, 2004 Selective Demolition and Façade Restoration Koenen Associates

1. Repair an area [approximately 36 inches (900 mm) high by 48 inches (1200 mm) wide] [as indicated] for each type of masonry material indicated to be rebuilt or replaced. 2. Patch three small areas [at least 1 inch (25 mm) in diameter] [as directed] for each type of masonry material indicated to be patched. 3. Clean an area [approximately 25 sq. ft. (2.3 sq. m) in area] [as indicated] for each type of clay masonry and surface condition.

a. Test cleaners and methods on samples of adjacent materials for possible adverse reactions unless cleaners and methods are known to have deleterious effect. b. Allow a waiting period of not less than seven days after completion of sample cleaning to permit a study of sample panels for negative reactions.

4. Rake out joints in two separate areas [approximately 36 inches (900 mm) high by 72 inches (1800 mm) wide] [as Indicated] for each type of repointing required and repoint one of the two areas.

1.6 DELIVERY, STORAGE, AND HANDLING

A. Deliver masonry units to Project site strapped together in suitable packs or pallets or in heavy-duty cartons.

B. - Deliver other materials to Project site in manufacturer's original and unopened containers, labeled with manufacturer's name and type of products.

• C. Store cementitious materials on elevated platforms, under cover, and in a dry location. Do not use cementitious materials that have become damp. D. Store hydrated lime in manufacturer's original and unopened containers. Discard lime if containers have been damaged or have been opened for more than two days. E. Store lime putty covered with water in sealed containers. F. Store sand where grading and other required characteristics can be maintained and contamination avoided.

1.7 PROJECT CONDITIONS

A. Repoint mortar joints and repair masonry only when air temperature is between and 40 and 90 deg F (4 and 32 deg C) and is predicted to remain so for at least 7 days after completion of work.

B. Hot-Weather Requirements: Protect masonry repair and mortar-joint pointing when temperature and humidity conditions produce excessive evaporation of water from mortar and repair materials. Provide artificial shade and wind breaks and use cooled materials as required. Do not apply mortar to substrates with temperatures of 90 deg F (32 deg C) and above.

•

CLAY MASONRY RESTORATION AND CLEANING 04901 -4

NYC-WTC 000125171