Asbestos testing correspondence, 153 Chambers Street, Apr 2002

NYC 9/11 Public Portal Document

Clean Air Testing Labs, Inc. 1111 Steele filed. 6okdwin, New York 1.1510 Tel./Fax: (516) 546.2640

item All Non-Friable• Organically Bound (NOB) samples are analyzed per.NYS. DOH ELAP requested shall be 198.1 (PLM) and 198.4 (TEM) when negative by PLM: Other samples as reduce gravimetrically reduced prior to slide preparation. This method is •particularly useful to be present in some the possibility of false negatives for levels of asbestos. Asbestos fibers may small size or interference non-friable materials, -but may not be detectable by PLM, due to- their be non-asbestos containing from binding -materials. If routine PLM analysis finds the sample to problematic material or containing asbestos in low concentration levels, the tile confirming organically bound asbestos samples ( floor tiles, roofing, etc.) that actually contain many small or quantify.very low levels of fibers which cannot be detected by PLM. It can also be used to asbestos (0.1%. by weight or less) on some types of bulk samples. ' .

materials in New York State, non-friable organically bound. by (NOn) must er determined to be negative (< or =1% asbestos) considered as analyzed by TEM before the sample can be officially recommends that non-asbestos containing material (ACM).should. EPA be analyzed by a floor tile reported as negative by PLM new EPA method utilizing TEM. 198.1 '(PLM) and Clean Air Testing Labs, Inc., uses ELAP method from •other areas are Samples 198.4 •(TEM) for New York samples. 'TEM protocol that- is Chatfield, evaluated by a similar modified (submitted by Eric 52.2.05.07.007 approval' pending ASTM Committee identification of any Chatfield,' 1988). The method leads to thethe sample, as well as within asbestos minerals (fibers) present asbestos•miner•als .are 'identified giving the weight percent. All energy' dispersive x-ray on the basis 'of fiber morphology,area electron diffraction (SAED). spectometry (EDS), and selected digestion p•r.cdedure, floor tile Following the matrix reduction only pigments. such.'as titanium inert residue usually contains fillers such as silicate or dioxide and/or iron oxides, asbestos if present. Other bulk. aluminosilicate minerals and inert materials. •A'modified materials•may contain additional required of used when analysis is method of :the aforementioned is non-friable materials. analyze these lApprovalthe aPprov~d The laboratory has been Envi~onmenta7..Laboratory NY State Department of Health Program (ELAP) Laboratory ID # 11242.

Project #02-91' Controlled Copy do Grey Paper Page 5 of 9

NYC-WTC 000106276