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Accredited by <br /> U.S.Dept.of Commerce <br /> ASBESTOS TEM LABORATORIES,INC WLAP LAB CODE 101891-0 <br /> CA DOHS ELAP <br /> Jan/03/2011 <br /> Don Light <br /> Del-Tech Geotechnical Support <br /> 645 N.Yosemite Ave <br /> Oakdale,CA 95361 <br /> RE: LABORATORY JOB# 1323-00002 <br /> Transmission electron microscopy analytical results for 5 air sample(s). <br /> Job Site: Austin Landfill <br /> Job No.: Fall 2010 Asbestos <br /> Enclosed please find results for the TEM analysis of one or more air samples.The analytical procedures were <br /> performed according to the NIOSH 7402(Revision#1) method. Prior to analysis, samples are checked for <br /> damage and disruption of the chain-of-custody seal. Samples are then logged-in,each given a unique laboratory <br /> number,and a hard copy containing all pertinent information is generated. This,and all other relevant paper work <br /> are kept with each sample throughout the analytical procedures to assure proper analysis. <br /> Preparation of air filter cassettes is performed within a HEPA filtered,Class 100 air,laminar flow clean bench <br /> environment. Cassettes are wet-wiped to remove any external contamination prior to placement into the clean <br /> bench area. Sections of the filters are removed,placed onto glass microscope slides,and collapsed in acetone <br /> vapor. The collapsed filters are plasma etched,removing the surface of the filter to a depth of ten percent of its <br /> original thickness,then carbon coated. The filters are further sectioned and placed carbon side up onto 200-mesh <br /> copper TEM sample grids in an acetone wick washer to remove filter material. The grids are placed into labeled <br /> containers and loaded into the microscope for analysis. <br /> TEM analysis is performed on a Philips EM-300 transmission electron microscope operating at 80 or 100 kV,with <br /> a magnification as indicated on the analytical report. A known area of the specimen surface is scanned for fibrous <br /> structures. All structures exhibiting an aspect ratio greater than or equal to 3 to 1,and a length greater than or equal <br /> to 5.0 um are subjected to detailed morphological and selected area diffraction(SHED)analysis. Structures <br /> indicated as asbestos,or potentially asbestos,are further analyzed by energy dispersive X-ray(EDX)analysis as <br /> needed.Analysis continues until 100 asbestiform structures are found,or an analytical sensitivity of 0.001 <br /> structures/cc is attained,or 40 grid openings are analyzed. Data is compiled into a standard report format and <br /> released to the client. <br /> Sincerely Yours, <br /> Laboratory Manager <br /> ASBESTOS TEM LABORATORIES,INC. <br /> ---These results relate only to the samples tested and must not bereproduced,except in full,with the approval of <br /> the laboratory. This report must not be used to claim product endorsement by NVLAP or any other agency of the <br /> U.S.Government.--- <br /> 630 BANCROFT WAY • BERKELEY,CA 94710 • (510)704-8930 • FAX(510)704-8429 <br /> www.asbestostemlabs.com With Offices in Reno,NV(775)359-3377 <br />