NYC-WTC_000220400

NYC 9/11 Public Portal Document

Hillmann Environmental Group, LLC

TABLE OF CONTENTS

Section 1 Executive Summary

1.1 General................ 1 1.2 Findings............... 1 1.3 Recommendations 2

Section 2 Introduction

2.1 General......................................... 3 2.2 Sampling Parameters and Methods 3 I. Temperature, Relative Humidity, Carbon Dioxide, and Carbon Monoxide 3 II. Volatile Organic Compounds.................................................................... 3 ni. Hydrogen Sulfide..................................................................................... 3 IV. Oxygen..................................................................................................... 3 V. Combustible Gasses.................................................................................. 4 VI. Airborne Asbestos Fibers.......................................................................... 4

Section 3 Results

3.1 Temperature, Relative Humidity, Carbon Dioxide, Carbon Monoxide, Volatile Organic Compounds, Hydrogen Sulfide, Oxygen, Combustible Gasses 5 3.2 Outside & Supply Measurements ..................................... 6 3.3 Airborne Asbestos Fiber Sample Analysis........................ 6 3.3 Bulk Asbestos Results...................................................... 7 Section 4 Discussion

4.1 Temperature......................... 8 4.2 Relative Humidity................ 8 4.3 Carbon Dioxide.................... 8 4.4 Carbon Monoxide................. 8 4.5 Volatile Organic Compounds 8 4.6 Hydrogen Sulfide.................. 9 4.7 Oxygen................................ 9 4.8 Combustible Gasses.............. 9 4.9 Airborne Asbestos Fibers..... 9

Section 5 Conclusions and Recommendations

5.1 Conclusions......... 10 5.2 Recommendations 10

Section 6 Appendices

6.1 List of Abbreviations 6.2 References

II

CITY_21MC100_002388351

NYC-WTC_000220402