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

3. [Available ]Products:

a. Dur-O-Wal, a Dayton Superior Company; Dur-O-Flex. b. Heckmann Building Products, Inc.; #391 Spiro Remedial Tie. c. Helifix Ltd.; [Helifix HRT60] [or] [Helifix HRT80]. d. <Insert manufacturer's name; product name or designation.> 4. MORTAR MIXES a. See Section 04200 Unit Masonry

2.6 CHEMICAL CLEANING SOLUTIONS

A. Dilute chemical cleaners with water to produce solutions not exceeding concentration recommended by chemical cleaner manufacturer.

B. Acidic Cleaner Solution for Brick: Dilute with water to produce hydrofluoric acid content of 3 percent or less, but not greater than that recommended by chemical cleaner manufacturer.

PART 3- EXECUTION

3.1 PROTECTION

A. Protect persons, motor vehicles, surrounding surfaces of building being restored, building site, plants, and surrounding buildings from harm resulting from masonry restoration work.

1. Erect temporary protective covers over walkways and at points of pedestrian and vehicular entrance and exit that must remain in service during course of restoration and cleaning work.

B. Comply with chemical cleaner manufacturer's written instructions for protecting building and other surfaces against damage from exposure to its products. Prevent chemical cleaning solutions from coming into contact with pedestrians, motor vehicles, landscaping, buildings, and other surfaces that could be harmed by such contact.

1. Cover adjacent surfaces with materials that are proven to resist chemical cleaners used unless chemical cleaners being used will not damage adjacent surfaces. Use materials that contain only waterproof, UV-resistant adhesives. Apply masking agents to comply with manufacturers written instructions. Do not apply liquid masking agent to painted or porous surfaces. When no longer needed, promptly remove masking to prevent adhesive staining. 2. Keep wall wet below area being cleaned to prevent streaking from runoff. 3. Do not clean masonry during winds of sufficient force to spread cleaning solutions to unprotected surfaces. 4. Neutralize and collect alkaline and acid wastes for disposal off Owner's property. 5. Dispose of runoff from cleaning operations by legal means and in a manner that prevents soil erosion, undermining of paving and foundations, damage to landscaping, and water penetration into building interiors.

CLAY MASONRY RESTORATION AND CLEANING 04901 -8

NYC-WTC 000125175