NYC-WTC_000229802

NYC 9/11 Public Portal Document

Scope of Work

ATC Associates, Inc. (ATC) was retained by New York City Board of Education (NYC- BOE) to collect dust wipe samples to be analyzed for lead content. Dust wipe samples were collected from representative HVAC units located in mechanical equipment areas. These locations are as follows:

• HVAC # 7 (Supply) • HVAC #9 (Supply) • HVAC #7 (Return) • HVAC #9 (Return) • HVAC #6 (Supply) • HVAC #12 (Supply) • HVAC #6 (Return) • HVAC #12 (Return) • HVAC #8 (Supply) • HVAC #3 (Supply) • HVAC #8 (Return) • HVAC #3 (Return) • HVAC #10 (Supply) • HVAC #1 (Supply) • HVAC #10 (Return) • HVAC #1 (Return) • HVAC #11 (Supply) • HVAC #11 (Return)

The purpose of the sampling was to determine the lead content in the dust present within these units. ATC’s representative Mr. Chacko Mathew visited IS 306X, located at 40 West Tremont Avenue, Bronx, NY on April 28,2002.

Samples were collected from within the ducts associated with the above referenced units. Access was gained through hatch doors present on supply and return systems.

LEAD-IN-DUST SAMPLING

Lead-in-dust threshold levels The New York City Health Code, part 173.14, the Federal Departments of Housing and Urban Development (HUD) and Environmental Protection Agency (EPA) have established acceptable lead-in-dust levels for re-occupancy after a lead abatement has occurred (commonly referred to as “final clearance” levels). As stated in the Code, final clearance after lead abatement activity is achieved when dust wipe samples indicate lead levels below those listed below:

For Windowsills: 250 pg/ft2 For Floors: 40 pg/tf

Although the lead-in-dust samples collected at IS 306X were not collected in response to lead abatement, these thresholds are referenced due to the fact that no other regulations or standards are applicable to this sampling.

rS306X <SiSIK May 2. 2002

CONFIDENTIAL, CITY_2IMCl00_003388301 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000229803