Law Department notice on WTC document preservation, Oct 2001

NYC 9/11 Public Portal Document

Non-Study

Lemongrass Grill 1^ Floor and basement. Cedar & Liberty Streets

Cleaning Method: Test 4A - Surface cleaning using industrial HEPA filtered vacuums. Area air filtration utilizing an air filtration device (AFD). Soap and water wet wipe of all horizontal surfaces. Test 4D - A/C Duct Cleaning Equipment Used: Nilfisk™ Vacuum (CFM 127), AFD Filtration Status: HEPA Unit Size: floor: 2,451 sq. ft.; 33,134 cu. ft.; basement: 1,080 sq. ft.; 9,720 cu. ft. AFD Status: Required AFD Specification: 1000/2000 cfm Unit Air Exchange Rate: 1st floor: 16.56 min @ 2,000 cfm; basement: 9.72 min @ 1000 cfm Minimum Air Exchange Required: Every 30 minutes

Unit Description: The restaurant encompasses approximately 3,500 square feet. It has entrances on both Cedar and Liberty Streets. The establishment is comprised of two floors. The first floor is at street level and was used for food service and customer dining. The lower level (basement) was used for food preparation and storage. Gypsum ceilings and hard wood floors are present throughout the dining area. Wood floor joists from the first floor constitute the basement ceiling. The floor is concrete. The dining area is decorated with typical Thai accents consisting of bamboo, and thatch. Grills, ovens, refrigerators, tables, chairs and a bar are on the first floor. The basement contains a walk-in refrigerator, freezers, preparation table, a dishwasher and dry good storage. The establishment’s HVAC system is suspended from the ceiling of the first floor. All exterior windows facing the WTC were blown inward depositing significant amounts of dust on all surfaces of the first floor. Minimal dust was present in the basement. Prior to cleaning all tables, chairs, containerized food and accent decorations were disposed of. Restaurant equipment including woks, utensils, pots, pans, and flatware were vacuumed and washed. Bottles of liquor were washed and removed by the owner.

The establishment has one HVAC system. This system provides heating and cooling to the dining area via solid metal supply ducts. The system’s return is located in the dining area. A second system provides outdoor makeup air to the cooking stations. Cleaning of this system was performed in accordance with the site-specific HVAC cleaning procedures prepared by Covino Environmental Associates Inc.

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NYC-WTC_000145196