Chain of Custody Form Instructions for WTC Building Sampling

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J • Compare results to representative background.** • Compare results to representative background.** o co

s 155 • Identify meteorological conditions and factors such as 0 Review pre-sampling questionnaire responses. ■D c CT road traffic during sampling. • Evaluate multiple source contributions (WTC, o' • Use for evaluation of outdoor contribution to indoor outdoor, indoor activities cooking cleaning,..). "□ o concentrations 0 Assess ventilation systems (heating and cooling). 9L • Compare to DEC monitors 0 Recommend proper clean-up techniques be employed. O o 0 Consider re-sampling and evaluate nearby o c residences/common areas. 3 CD 3

Inhalable Particulate 24 hour TSP 2

• Compare results to representative background.** • Compare results to representative background.** 250 • Identify meteorologic conditions, activities such as > Assess ventilation systems (heating and cooling). road traffic or construction activities during sampling. 0 Consider evaluating with modification to occupational • Assess the need for dust suppression procedures. standards. ® • Recommend proper clean-up techniques be employed. 0 Consider re-sampling after clean-up has occurred.

** As sampled in “Ambient and Indoor Sampling for Public Health Evaluations of Residential Areas Near WTC.” National Ambient Air Quality Standard (NAAQS) Total Suspended Particulates, New York State Ambient Air Quality Standard ’ The range of ratios reported in the 1996 and 2001 draft Ambient Air Criteria Documents for Indoor and Outdoor concentrations rf PM 2.5 could be used to select a multiplier to be applied to the area level of concern. While estimates (from a limited number of studies) range from slightlyless than one, to two (higher if smoking