EPA letter on residential dust cleaning results, Jan 2003

NYC 9/11 Public Portal Document

Laboratory: EMSL DaU ValidaUon Date: 10/28/2002

--------------------- cl Method concentrations of both long and short fibers in the air that may impact health. This is the method used inder EPA standards to detennine whether an asbestos dean up project has left behind residual contamination. The standard for school dean ups is 0.022 fibers/ cubic centimeter, as converted from 70 structures/sq.mm based on a sample volume of 1200 liters.

Sample Locauon uaie VblUiHb (L) "1100^5110510? Asbestus Alleilytll.<3l Fibers >0.5um Sensitivity (fibers/cc) ASbftstos cottuHirauon— Analyzed (sqmm) Fibers Type (nt)ers/sq.mm) inoers/ccj 10623-297-1511 Living Room 10/24/02 3.712.5 0.2000 9.0 Not Detected 0.0 0.0005 <5.00 "karoos” 10623-297-1512 Dining Room 10/24/02 3,693.8 0.2000 8.0 Not Detected 0.0 0.0005 <5.00 <0.0005 10623-297-1513 Kitchen 10/24/02 3,712.5 Not Analyzed 0.0 10623-297-1514 Bedroom 10/24/02 3,693.8 0.2000 0.0 Not Detected 0.0 0.0005 <5.00 <0.0005 10823-297-1515 Bathroom 10/24/02 3,712.5 Not Analyzed 0.0 10623-297-1516 Kitchen2 10/24/02 3,731.3 0.2000 8.0 Not Detected 0.0 0.0005 <5.00 <0.0005 (ey: Sample IdenUficaGon number assigned Io the sample. Location Location in the apartment where the sample was collected. Date Date the sample was collected. Volume (L) Volume of air drawn across the filter in liters. Area Analyzed (sq.mm) Area of the filter which was analyzed in square milimeters. Non-Asbestos Fibers Number of non-asbestos fibers which were delected. Other fiber types include fibrous glass, mineral wool and fabric fibers. Asbestos Type Type of asbestos detected. Types include chrysotle, crocidolite, amosite, anthophyllite, tremolite, or actinolite. Overload indicates tha a sample could not be analyzed because more than 25% of the filter contained excess particulate matter. Not Analyzed indicates the filter was damaged or otherwise unabte to be analyzed. Asbestos Fibers>0.Sum Number of asbestos fibers detected that were greater than (>) 0.5 microns in length. Analytical Sensitivity (fibers/cc) Lowest value the analytical method can detect. Asbestos Concentration (fibers/sq.mm) Estimated number of asbestos fibers greater than (>) 0.5 microns detected per millimeter squared. Asbestos Concentration (fibers/cc) Estimated number of asbestos fibers greater than (>) 0.5 microns detected per cubic centimeter of air. NOTE: WEfVt^r^its^xr^ reported in units of structures/cubic cenfimeler of air. Stnxlures and fibers are generally interchangeable tenns and for this evaluation results are reported as

Laboratory: EMSL Data Validation Date: 10/28/2002 Phase Contrast Microscopy (PCM) - Air Is passed through a membrane filter. A Light microscope is used to ilentiiy the presence and types of fibers in the air. The fibers are stained to help In theL identification. This Description of Method: method cannot identify fibers smaller than lum. nor can it accurately identify different types of fibers. This is the method ised by OSHA to determine compliance with its standard AHERA criteria for PCM is 0.01 f/cc

sample Location TJSW volume (L) luiai —cimnif— Coiiceiioailud ^ciiTCsnffSfQ^ Fibers Detection (f/cc) Rbers/sq.mm Fibers/tx

10623-297-1511 Living Room 10/24/02 3,712.5 8.0 0.001 10.19 0.0010 10623-297-1512 Dining Room 10/24/02 3,693.8 11.0 0.001 14.01 0.0010 10623-297-1513 Kitchen 10/24/02 3,712.5 0.0 Not /Analyzed 10623-297-1514 Bedroom 10/24/02 3,693.8 4.0 0.001 <7.0 <0.001 10623-297-1515 Bathroom 10/24/02 3,712.5 0.0 Not Analyzed 10623-297-1516 Kitchen2 10/24A)2 3,731.3 5.0 0.001 <7.0 <0.001

Key: Sample Identification number assigned to the sample. Location Location in the apartment where the sample was collected. Date Date the sample was collected. Volume (L) Volume of air drawn across the filler in liters. Total Fibers Total fibers detected greater than 1 micron in length. Fiber types may consist of asbestos, fibrous glass, mineral wool, or fabric fibers. Limit of Detection (f/cc) Lowest value the analytical method can detect. Fibers/sq.mm Estimated number of fibers greater than 1 micron detected per millimeter squared. Fibers/cc Estimated number of libers greater than 1 micron detected per cubic centimeter of air. Overloaded indcales that a sample could not be analyzed because more than 25% of the fiter contained excess particulate matter.

NYC-WTC_000150147